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- 'bottom–up' and 'top–down' processes (1)
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- (Euliina) (1)
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- 1977 (wing lustre, new combination) (1)
- 1992. Heliogomphus sp (1)
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- 2006 (1)
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- 28S phylogeny (1)
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- crapemyrtle scale (1)
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- Biowissenschaften (378)
- Extern (375)
- Institut für Ökologie, Evolution und Diversität (150)
- Senckenbergische Naturforschende Gesellschaft (139)
- Biochemie und Chemie (122)
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- Biodiversität und Klima Forschungszentrum (BiK-F) (104)
- Frankfurt Institute for Advanced Studies (FIAS) (45)
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- Exzellenzcluster Makromolekulare Komplexe (32)
The experience of pain is mediated by a specialized sensory system, the nociceptive system. There is considerable evidence that the cGMP/cGMP kinase I (cGKI) signaling pathway modulates the nociceptive processing within the spinal cord. However, downstream targets of cGKI in this context have not been identified to date. In this study we investigated whether cysteine-rich protein 2 (CRP2) is a downstream effector of cGKI in the spinal cord and is involved in nociceptive processing. Immunohistochemistry of the mouse spinal cord revealed that CRP2 is expressed in superficial laminae of the dorsal horn. CRP2 is colocalized with cGKI and with markers of primary afferent C fibers. Importantly, the majority of CRP2 mRNA-positive dorsal root ganglion (DRG) neurons express cGKI and CRP2 is phosphorylated in a cGMP-dependent manner. To elucidate the functional role of CRP2 in nociception, we investigated the nociceptive behavior of CRP2-deficient (CRP2-/-) mice. Touch perception and acute thermal nociception were unaltered in CRP2-/- mice. However, CRP2-/- mice showed an increased nociceptive behavior in models of persistent pain as compared to wild type mice. Intrathecal administration of cGKI activating cGMP analogs increased the nociceptive behavior in wild type but not in CRP2-/- mice, indicating that the presence of CRP2 was essential for cGMP/cGKI-mediated nociception. These data indicate that CRP2 is a new downstream effector of cGKI-mediated spinal nociceptive processing and point to an inhibitory role of CRP2 in the generation of inflammatory pain.
cGMP- and cAMP-dependent protein kinases (cGK and cAK) mediate the inhibitory effects of endothelium-derived messenger molecules nitric oxide and prostacyclin on platelets. To understand the mechanisms involved in platelet inhibition we searched for new substrates of cGK and cAK. We identified Rap1GAP2, the only GTPase-activating protein of Rap1 in platelets. Rap1 is a guanine-nucleotide binding protein that controls integrin activity, platelet adhesion and aggregation. Rap1GAP2 is required to turn over Rap1-GTP to Rap1-GDP resulting in the inactivation of integrins and reduced cellular adhesion. Using phospho-specific antibodies we demonstrate phosphorylation of endogenous Rap1GAP2 on serine 7 by cGK and cAK in intact platelets. Yeast-two-hybrid screening revealed an interaction of the phosphoserine/-threonine binding adapter protein 14-3-3 with Rap1GAP2, and we mapped the 14-3-3 binding site to the N-terminus of Rap1GAP2 close to the cGK/cAK phosphorylation site. We could show that 14-3-3 binding to Rap1GAP2 requires phosphorylation of serine 9. Platelet activation by ADP and thrombin treatment induces Rap1GAP2 serine 9 phosphorylation and enhances the attachment of 14-3-3 to Rap1GAP2. In contrast, phosphorylation of serine 7 by cGK/cAK leads to the detachment of 14-3-3. Furthermore, Rap1GAP2 serine 7 phosphorylation correlates with the inhibition of Rap1-GTP formation by cGMP and cAMP in platelets. Cell adhesion experiments provide additional evidence that Rap1GAP2 is activated by the detachment of 14-3-3. Point mutants of Rap1GAP2 deficient in 14-3-3 binding inhibit Rap1-mediated cell adhesion significantly stronger than a Rap1GAP2 mutant that binds 14-3-3 constitutively. Our findings define a novel regulatory mechanism that might contribute to both platelet activation and endothelial inhibition of platelet adhesion and aggregation.
Oxidative stress attenuates the NO-cGMP pathway, e.g. in the vascular system, through scavenging of free NO radicals by superoxide O2•-, by inactivation of soluble guanylyl cyclase (sGC) via oxidation of its central Fe2+ ion, and by down-regulation of sGC protein levels. While the former pathways are well established, the molecular mechanisms underlying the latter are still obscure. Using oxidative sGC inhibitor ODQ we demonstrate rapid down-regulation of sGC protein in mammalian cells. Co-incubation with proteasomal inhibitor MG132 results in accumulation of ubiquitinated sGC whereas sGC activator BAY 58–2667 prevents ubiquitination. ODQ-induced down-regulation of sGC is mediated through selective ubiquitination of its b subunit, and BAY 58–2667 abrogates this effect. Ubiquitination of sGC-b is dramatically enhanced by E3 ligase CHIP. Our data indicate that oxidative stress promotes ubiquitination of sGC b subunit through E3 ligase CHIP, and that sGC activator 58–2667 reverts this effect, most likely through stabilization of the heme-free b subunit. Thus the deleterious effects of oxidative stress can be counter-balanced by an activator of a key enzyme of vascular homeostasis.
Bypassing of DNA lesions by damage-tolerant DNA polymerases depends on the interaction of these enzymes with the monoubiquitylated form of the replicative clamp protein, PCNA. We have analyzed the contributions of ubiquitin and PCNA binding to damage bypass and damage-induced mutagenesis in Polymerase {eta} (encoded by RAD30) from the budding yeast Saccharomyces cerevisiae. We report here that a ubiquitin-binding domain provides enhanced affinity for the ubiquitylated form of PCNA and is essential for in vivo function of the polymerase, but only in conjunction with a basal affinity for the unmodified clamp, mediated by a conserved PCNA interaction motif. We show that enhancement of the interaction and function in damage tolerance does not depend on the ubiquitin attachment site within PCNA. Like its mammalian homolog, budding yeast Polymerase {eta} itself is ubiquitylated in a manner dependent on its ubiquitin-binding domain.
To facilitate the measurement of intramolecular distances in solvated RNA systems, a combination of spin-labeling, electron paramagnetic resonance (EPR), and molecular dynamics (MD) simulation is presented. The fairly rigid spin label 2,2,5,5-tetramethyl-pyrrolin-1-yloxyl-3-acetylene (TPA) was base and site specifically introduced into RNA through a Sonogashira palladium catalyzed crosscoupling on column. For this purpose 5-iodouridine, 5-iodo-cytidine and 2-iodo-adenosine phosphoramidites were synthesized and incorporated into RNA-sequences. Application of the recently developed ACE (R) chemistry presented the main advantage to limit the reduction of the nitroxide to an amine during the oligonucleotide automated synthesis and thus to increase substantially the reliability of the synthesis and the yield of labeled oligonucleotides. 4-Pulse Electron Double Resonance (PELDOR) was then successfully used to measure the intramolecular spin–spin distances in six doubly labeled RNA-duplexes. Comparison of these results with our previous work on DNA showed that A- and B-Form can be differentiated. Using an all-atom force field with explicit solvent, MD simulations gave results in good agreement with the measured distances and indicated that the RNA A-Form was conserved despite a local destabilization effect of the nitroxide label. The applicability of the method to more complex biological systems is discussed.
Riboswitches are highly structured elements in the 50-untranslated regions (50-UTRs) of messenger RNA that control gene expression by specifically binding to small metabolite molecules. They consist of an aptamer domain responsible for ligand binding and an expression platform. Ligand binding in the aptamer domain leads to conformational changes in the expression platform that result in transcription termination or abolish ribosome binding. The guanine riboswitch binds with high-specificity to guanine and hypoxanthine and is among the smallest riboswitches described so far. The X-ray-structure of its aptamer domain in complex with guanine/ hypoxanthine reveals an intricate RNA-fold consisting of a three-helix junction stabilized by longrange base pairing interactions. We analyzed the conformational transitions of the aptamer domain induced by binding of hypoxanthine using highresolution NMR-spectroscopy in solution. We found that the long-range base pairing interactions are already present in the free RNA and preorganize its global fold. The ligand binding core region is lacking hydrogen bonding interactions and therefore likely to be unstructured in the absence of ligand. Mg2+-ions are not essential for ligand binding and do not change the structure of the RNA-ligand complex but stabilize the structure at elevated temperatures. We identified a mutant RNA where the long-range base pairing interactions are disrupted in the free form of the RNA but form upon ligand binding in an Mg2+-dependent fashion. The tertiary interaction motif is stable outside the riboswitch context.
Background Cryptic species are two or more distinct but morphologically similar species that were classified as a single species. During the past two decades we observed an exponential growth of publications on cryptic species. Recently published reviews have demonstrated cryptic species have profound consequences on many biological disciplines. It has been proposed that their distribution is non-random across taxa and biomes. Results We analysed a literature database for the taxonomic and biogeographical distribution of cryptic animal species reports. Results from regression analysis indicate that cryptic species are almost evenly distributed among major metazoan taxa and biogeographical regions when corrected for species richness and study intensity. Conclusion This indicates that morphological stasis represents an evolutionary constant and that cryptic metazoan diversity does predictably affect estimates of earth´s animal diversity. Our findings have direct theoretical and practical consequences for a number of prevailing biological questions with regard to global biodiversity estimates, conservation efforts and global taxonomic initiatives.
Infektionen mit Herpesviren sind bereits seit der Antike bekannt. So beschrieb zum Beispiel schon Hippokrates in seinem »Corpus Hippocraticum« die sich auf der Haut ausbreitenden Herpes Simplex Läsionen und gab der Krankheit ihren bis heute gültigen Namen. Verbürgt ist auch, dass der römische Kaiser Tiberius vor etwa 2000 Jahren während einer auftretenden Herpes labialis-Epidemie das Küssen bei öffentlichen Zeremonien per Dekret verbat. Shakespeare war ebenfalls bestens vertraut mit den periodisch auftretenden Herpes-Bläschen; in seinem Werk »Romeo & Julia« spricht Mercutio zu Romeo: »O’er ladies lips, who straight on kisses dream, which oft the angry Mab with blisters plagues, ….« Doch erst in den 1960er Jahren erkannte man die virale Herkunft der Erkrankung.
Ahnenforschung unter sozialen Amöben : die morphologische Taxonomie muss umgeschrieben werden
(2007)
Seit fast 150 Jahren forschen Wissenschaftler aus aller Welt über den faszinierenden Wechsel zwischen Einzelligkeit und Vielzelligkeit im Lebenszyklus der »zellulären Schleimpilze«. Diese Forschung war bisher so erfolgreich, dass einem Vertreter der zellulären Schleimpilze, Dictyostelium discoideum, vom US-amerikanischen Gesundheitsministerium National Institutes of Health (NIH) ganz offiziell der Status eines Modellorganismus für biomedizinische Forschung verliehen wurde. Obwohl wir inzwischen glauben, viel über die »sozialen Amöben«, die sich bei Nahrungsmangel von Einzellern zu einem vielzelligen Verband zusammenlagern, gelernt zu haben, basiert unser Wissen doch fast ausschließlich auf Arbeiten mit der einen Art D. discoideum. Man kennt allerdings heute mehr als 100 Arten sozialer Amöben. Alle bilden multizelluläre Fruchtkörper aus, die aus Stielen und Sporenpaketen bestehen. Bisher ging man davon aus, dass die Spezies mit azellulären Stielen in ihren Fruchtkörpern phylogenetische Vorläufer der Vertreter mit zellulären Stielen sind, und dass die Vertreter mit verzweigten Fruchtkörpern näher mit sich selbst als mit den anderen sozialen Amöben verwandt sind. Diese Hypothesen wurden nun durch aktuelle molekulargenetische Analysen widerlegt.
Expeditionen ins Pilzreich Panamas : Pionierarbeit in einer der artenreichsten Regionen unserer Erde
(2007)
Als Bindeglied zwischen Nord- und Südamerika ist Panama ein »Biodiversitäts-Hotspot« – es beherbergt eine außerordentlich hohe Artenvielfalt an Pflanzen, Tieren und Pilzen. Pilze übernehmen in tropischen Ökosystemen wichtige Aufgaben: Sie zersetzen totes organisches Material, helfen den Pflanzen bei der Aufnahme von Wasser und Mineralstoffen aus dem Boden, und sie leisten sogar als Parasiten einen Beitrag zum Erhalt einer großen Artenvielfalt. Aufgrund einzelner Stichproben wissen wir, dass die Anzahl der Pilzarten in den Tropen diejenige der Pflanzen um ein Vielfaches übertrifft. Doch während für Panama zirka 9500 verschiedene Arten von Gefäßpflanzen bekannt sind, zählt eine im Rahmen unserer Arbeit erstellte Checkliste der Pilze nur zirka 1800 Arten. Das zeigt, dass für die Erforschung der Pilze noch umfangreiche Pionierarbeit geleistet werden muss. Zwischen 2003 und 2006 geschah dies im Rahmen einer Universitätspartnerschaft der Universität Frankfurt mit der Universidad Autónoma de Chiriquí, die durch den Deutschen Akademischen Austauschdienst (DAAD) gefördert wurde. Im Zentrum eines Projekts der Deutschen Forschungsgemeinschaft (DFG) steht die Erforschung der Vielfalt und Ökologie pflanzenparasitischer Pilze. Des Weiteren untersucht unsere Arbeitsgruppe Pilze an Insekten sowie an menschlichen Haut- und Nagelläsionen.
Background Synchronous neuronal firing has been discussed as a potential neuronal code. For testing first, if synchronous firing exists, second if it is modulated by the behaviour, and third if it is not by chance, a large set of tools has been developed. However, to test whether synchronous neuronal firing is really involved in information processing one needs a direct comparison of the amount of synchronous firing for different factors like experimental or behavioural conditions. To this end we present an extended version of a previously published method NeuroXidence [1], which tests, based on a bi- and multivariate test design, whether the amount of synchronous firing above the chance level is different for different factors.
Background The synchrony hypothesis postulates that precise temporal synchronization of different pools of neurons conveys information that is not contained in their firing rates. The synchrony hypothesis had been supported by experimental findings demonstrating that millisecond precise synchrony of neuronal oscillations across well separated brain regions plays an essential role in visual perception and other higher cognitive tasks [1]. Albeit, more evidence is being accumulated in favour of its role as a binding mechanism of distributed neural responses, the physical and anatomical substrate for such a dynamic and precise synchrony, especially zero-lag even in the presence of non-negligible delays, remains unclear. Here we propose a simple network motif that naturally accounts for zero-lag synchronization for a wide range of temporal delays [3]. We demonstrate that zero-lag synchronization between two distant neurons or neural populations can be achieved by relaying the dynamics via a third mediating single neuron or population. Methods We simulated the dynamics of two Hodgkin-Huxley neurons that interact with each other via an intermediate third neuron. The synaptic coupling was mediated through alpha-functions. Individual temporal delays of the arrival of pre-synaptic potentials were modelled by a gamma distribution. The strength of the synchronization and the phase-difference between each individual pairs were derived by cross-correlation of the membrane potentials. Results In the regular spiking regime the two outer neurons consistently synchronize with zero phase lag irrespective of the initial conditions. This robust zero-lag synchronization naturally arises as a consequence of the relay and redistribution of the dynamics performed by the central neuron. This result is independent on whether the coupling is excitatory or inhibitory and can be maintained for arbitrarily long time delays (see Fig. 1). Conclusion We have presented a simple and extremely robust network motif able to account for the isochronous synchronization of distant neural elements in a natural way. As opposed to other possible mechanisms of neural synchronization, neither inhibitory coupling, gap junctions nor precise tuning of morphological parameters are required to obtain zero-lag synchronized neuronal oscillation.
Background The cell cycle of all organisms includes mass increase by a factor of two, replication of the genetic material, segregation of the genome to different parts of the cell, and cell division into two daughter cells. It is tightly regulated and typically includes cell cycle-specific oscillations of the levels of transcripts, proteins, protein modifications, and signaling molecules. Until now cell cycle-specific transcriptome changes have been described for four eukaryotic species ranging from yeast to human, but only for two prokaryotic species. Similarly, oscillations of small signaling molecules have been identified in very few eukaryotic species, but not in any prokaryote. Results A synchronization procedure for the archaeon Halobacterium salinarum was optimized, so that nearly 100% of all cells divide in a time interval that is 1/4th of the generation time of exponentially growing cells. The method was used to characterize cell cycle-dependent transcriptome changes using a genome-wide DNA microarray. The transcript levels of 87 genes were found to be cell cycle-regulated, corresponding to 3% of all genes. They could be clustered into seven groups with different transcript level profiles. Cluster-specific sequence motifs were detected around the start of the genes that are predicted to be involved in cell cycle-specific transcriptional regulation. Notably, many cell cycle genes that have oscillating transcript levels in eukaryotes are not regulated on the transcriptional level in H. salinarum. Synchronized cultures were also used to identify putative small signaling molecules. H. salinarum was found to contain a basal cAMP concentration of 200 uM, considerably higher than that of yeast. The cAMP concentration is shortly induced directly prior to and after cell division, and thus cAMP probably is an important signal for cell cycle progression. Conclusions The analysis of cell cycle-specific transcriptome changes of H. salinarum allowed to identify a strategy of transcript level regulation that is different from all previously characterized species. The transcript levels of only 3% of all genes are regulated, a fraction that is considerably lower than has been reported for four eukaryotic species (6% - 28%) and for the bacterium C. crescentus (19%). It was shown that cAMP is present in significant concentrations in an archaeon, and the phylogenetic profile of the adenylate cyclase indicates that this signaling molecule is widely distributed in archaea. The occurrence of cell cycle-dependent oscillations of the cAMP concentration in an archaeon and in several eukaryotic species indicates that cAMP level changes might be a phylogenetically old signal for cell cycle progression.
Effects of BPA in snails
(2006)
It is an ethical requirement that new findings be presented in light of and in conjunction with a balanced evaluation of the current knowledge and published literature. We believe that Oehlmann et al. (2006) violated this general principle in several ways. For example, the authors inferred that prosobranch snails have a functional estrogen receptor and therefore a much higher sensitivity to estrogens and endocrine-disrupting compounds (EDCs) than other species previously reported in the literature. We found several other problems in their article...
We welcome critical appraisals that help to provide balance; however, Dietrich et al. gave an unjustified reproach. We feel that Dietrich’s position is severely compromised because he serves as an expert for the bisphenol A (BPA) Industry Group (Brussels, Belgium). We would like to respond to the issues raised by Dietrich et al., as well as to their oversights and inappropriate interpretations of our findings...
There is a growing body of evidence that indicates common environmental pollutants are capable of disrupting reproductive and developmental processes by interfering with the actions of endogenous hormones. Many reports of endocrine disruption describe changes in the normal development of organs and tissues that are consistent with genetic damage, and recent studies confirm that many chemicals classified to have hormone-modulating effects also possess carcinogenic and mutagenic potential. To date, however, there have been no conclusive examples linking genetic damage with perturbation of endocrine function and adverse effects in vivo. Here, we provide the first evidence of DNA damage associated with the development of imposex (the masculinization of female gastropods considered to be the result of alterations to endocrine-mediated pathways) in the dog-whelk Nucella lapillus. Animals (n = 257) that displayed various stages of tributyltin (TBT)-induced imposex were collected from sites in southwest England, and their imposex status was determined by physical examination. Linear regression analysis revealed a very strong relationship (correlation coefficient of 0.935, p < 0.0001) between the degree of imposex and the extent of DNA damage (micronucleus formation) in hemocytes. Moreover, histological examination of a larger number of dog-whelks collected from sites throughout Europe confirmed the presence of hyperplastic growths, primarily on the vas deferens and penis in both TBT-exposed male snails and in females that exhibited imposex. A strong association was found between TBT body burden and the prevalence of abnormal growths, thereby providing compelling evidence to support the hypothesis that environmental chemicals that affect reproductive processes do so partly through DNA damage pathways.
Previous investigations have shown that bisphenol A (BPA) induces a superfeminization syndrome in the freshwater snail Marisa cornuarietis at concentrations as low as 1 μg/L. Superfemales are characterized by the formation of additional female organs, enlarged accessory sex glands, gross malformations of the pallial oviduct, and a stimulation of egg and clutch production, resulting in increased female mortality. However, these studies were challenged on the basis of incomplete experimentation. Therefore, the objective of the current approach was to bridge several gaps in knowledge by conducting additional experiments. In an initial series of experiments, study results from the reproductive phase of the snails were evaluated in the sub-micrograms per liter range. Before and after the spawning season, superfemale responses were observed [NOEC (no observed effect concentration) 7.9 ng/L, EC10 (effective concentration at 10%) 13.9 ng/L], which were absent during the spawning season. A further experiment investigated the temperature dependence of BPA responses by exposing snails at two temperatures in parallel. The adverse effect of BPA was at least partially masked at 27°C (EC10 998 ng/L) when compared with 20°C (EC10 14.8 ng/L). In M. cornuarietis, BPA acts as an estrogen receptor (ER) agonist, because effects were completely antagonized by a co-exposure to tamoxifen and Faslodex. Antiandrogenic effects of BPA, such as a significant decrease in penis length at 20°C, were also observed. Competitive receptor displacement experiments indicate the presence of androgen- and estrogen-specific binding sites. The affinity for BPA of the estrogen binding sites in M. cornuarietis is higher than that of the ER in aquatic vertebrates. The results emphasize that prosobranchs are affected by BPA at lower concentrations than are other wildlife groups, and the findings also highlight the importance of exposure conditions.
Tens of thousands of man-made chemicals are in regular use and discharged into the environment. Many of them are known to interfere with the hormonal systems in humans and wildlife. Given the complexity of endocrine systems, there are many ways in which endocrine-disrupting chemicals (EDCs) can affect the body’s signaling system, and this makes unraveling the mechanisms of action of these chemicals difficult. A major concern is that some of these EDCs appear to be biologically active at extremely low concentrations. There is growing evidence to indicate that the guiding principle of traditional toxicology that “the dose makes the poison” may not always be the case because some EDCs do not induce the classical dose–response relationships. The European Union project COMPRENDO (Comparative Research on Endocrine Disrupters—Phylogenetic Approach and Common Principles focussing on Androgenic/Antiandrogenic Compounds) therefore aims to develop an understanding of potential health problems posed by androgenic and antiandrogenic compounds (AACs) to wildlife and humans by focusing on the commonalities and differences in responses to AACs across the animal kingdom (from invertebrates to vertebrates).
Polyploidy is common in higher eukaryotes, especially in plants, but it is generally assumed that most prokaryotes contain a single copy of a circular chromosome and are therefore monoploid. We have used two independent methods to determine the genome copy number in halophilic archaea, 1) cell lysis in agarose blocks and Southern blot analysis, and 2) Real-Time quantitative PCR. Fast growing H. salinarum cells contain on average about 25 copies of the chromosome in exponential phase, and their ploidy is downregulated to 15 copies in early stationary phase. The chromosome copy number is identical in cultures with a twofold lower growth rate, in contrast to the results reported for several other prokaryotic species. Of three additional replicons of H. salinarum, two have a low copy number that is not growth-phase regulated, while one replicon even shows a higher degree of growth phase-dependent regulation than the main replicon. The genome copy number of H. volcanii is similarly high during exponential phase (on average 18 copies/cell), and it is also downregulated (to 10 copies) as the cells enter stationary phase. The variation of genome copy numbers in the population was addressed by fluorescence microscopy and by FACS analysis. These methods allowed us to verify the growth phase-dependent regulation of ploidy in H. salinarum, and they revealed that there is a wide variation in genome copy numbers in individual cells that is much larger in exponential than in stationary phase. Our results indicate that polyploidy might be more widespread in archaea (or even prokaryotes in general) than previously assumed. Moreover, the presence of so many genome copies in a prokaryote raises questions about the evolutionary significance of this strategy.
Background Olfactory receptors work at the interface between the chemical world of volatile molecules and the perception of scent in the brain. Their main purpose is to translate chemical space into information that can be processed by neural circuits. Assuming that these receptors have evolved to cope with this task, the analysis of their coding strategy promises to yield valuable insight in how to encode chemical information in an efficient way. Results We mimicked olfactory coding by modeling responses of primary olfactory neurons to small molecules using a large set of physicochemical molecular descriptors and artificial neural networks. We then tested these models by recording in vivo receptor neuron responses to a new set of odorants and successfully predicted the responses of five out of seven receptor neurons. Correlation coefficients ranged from 0.66 to 0.85, demonstrating the applicability of our approach for the analysis of olfactory receptor activation data. The molecular descriptors that are best-suited for response prediction vary for different receptor neurons, implying that each receptor neuron detects a different aspect of chemical space. Finally, we demonstrate that receptor responses themselves can be used as descriptors in a predictive model of neuron activation. Conclusions The chemical meaning of molecular descriptors helps understand structure-response relationships for olfactory receptors and their 'receptive fields'. Moreover, it is possible to predict receptor neuron activation from chemical structure using machine-learning techniques, although this is still complicated by a lack of training data.
Background Identification and evaluation of surface binding-pockets and occluded cavities are initial steps in protein structure-based drug design. Characterizing the active site's shape as well as the distribution of surrounding residues plays an important role for a variety of applications such as automated ligand docking or in situ modeling. Comparing the shape similarity of binding site geometries of related proteins provides further insights into the mechanisms of ligand binding. Results We present PocketPicker, an automated grid-based technique for the prediction of protein binding pockets that specifies the shape of a potential binding-site with regard to its buriedness. The method was applied to a representative set of protein-ligand complexes and their corresponding apo-protein structures to evaluate the quality of binding-site predictions. The performance of the pocket detection routine was compared to results achieved with the existing methods CAST, LIGSITE, LIGSITEcs, PASS and SURFNET. Success rates PocketPicker were comparable to those of LIGSITEcs and outperformed the other tools. We introduce a descriptor that translates the arrangement of grid points delineating a detected binding-site into a correlation vector. We show that this shape descriptor is suited for comparative analyses of similar binding-site geometry by examining induced-fit phenomena in aldose reductase. This new method uses information derived from calculations of the buriedness of potential binding-sites. Conclusions The pocket prediction routine of PocketPicker is a useful tool for identification of potential protein binding-pockets. It produces a convenient representation of binding-site shapes including an intuitive description of their accessibility. The shape-descriptor for automated classification of binding-site geometries can be used as an additional tool complementing elaborate manual inspections.
Background The connection of the variable part of the heavy chain (VH) and and the variable part of the light chain (VL) by a peptide linker to form a consecutive polypeptide chain (single chain antibody, scFv) was a breakthrough for the functional production of antibody fragments in Escherichia coli. Being double the size of fragment variable (Fv) fragments and requiring assembly of two independent polypeptide chains, functional Fab fragments are usually produced with significantly lower yields in E. coli. An antibody design combining stability and assay compatibility of the fragment antigen binding (Fab) with high level bacterial expression of single chain Fv fragments would be desirable. The desired antibody fragment should be both suitable for expression as soluble antibody in E. coli and antibody phage display. Results Here, we demonstrate that the introduction of a polypeptide linker between the fragment difficult (Fd) and the light chain (LC), resulting in the formation of a single chain Fab fragment (scFab), can lead to improved production of functional molecules. We tested the impact of various linker designs and modifications of the constant regions on both phage display efficiency and the yield of soluble antibody fragments. A scFab variant without cysteins (scFabdeltaC) connecting the constant part 1 of the heavy chain (CH1) and the constant part of the light chain (CL) were best suited for phage display and production of soluble antibody fragments. Beside the expression system E.coli, the new antibody format was also expressed in Pichia pastoris. Monovalent and divalent fragments (DiFabodies) as well as multimers were characterised. Conclusion A new antibody design offers the generation of bivalent Fab derivates for antibody phage display and production of soluble antibody fragments. This antibody format is of particular value for high throughput proteome binder generation projects, due to the avidity effect and the possible use of common standard sera for detection.
Background The Radical Pair model proposes that magnetoreception is a light-dependent process. Under low monochromatic light from the short-wavelength part of the visual spectrum, migratory birds show orientation in their migratory direction. Under monochromatic light of higher intensity, however, they showed unusual preferences in other directions or axial preferences. To determine whether or not these responses are still controlled by the respective light regimes, European robins, Erithacus rubecula, were tested under UV, Blue, Turquoise and Green light at increasing intensities, with orientation in migratory direction serving as a criterion whether or not magnetoreception works in the normal way. Results Under low light with a quantal flux of 8 times 10 to 15 power quanta s-1 m-2, the birds were well oriented in their seasonally appropriate migratory direction under 424 nm Blue, 502 nm Turquoise and 565 nm Green light, indicating unimpaired magnetoreception. Under 373 nm UV of the same quantal flux, they were not oriented in migratory direction, showing a preference of the east-west axis instead, but they showed excellent orientation in migratory direction under UV of lower intensity. Intensities of above 36 times 10 to 15 power quanta s-1 m-2 of Blue, Turquoise and Green light elicited a variety of responses: disorientation, headings along the east-west axis, headings along the north-south axis or 'fixed' direction tendencies. These responses changed as the intensity was increased from 36 times 10 to the 15 power quanta s-1 m-2 to 54 and 72 times 10 to 15 power quanta s-1 m-2. Conclusion The specific manifestation of responses in directions other than migratory direction clearly depends on the ambient light regime. This implies that although mechanisms normally providing magnetic compass information seem disrupted, processes that are activated by light still control the behavior. It suggests complex interactions between different types of receptors, magnetic and visual. The nature of the receptors involved and details of their connections are not yet known; however, a role of the color cones in the processes mediating magnetic input is suggested.
Oral presentations Background: We selected peptide ligands for the HIV-1 packaging signal PSI by screening phage displayed peptide libraries. Peptide ligands were optimized by screening spot synthesis peptide membranes. The aim of this study is the functional characterization of these peptide ligands with respect to inhibition of HIV-1 replication. Methods: Phage displayed peptide libraries were screened with PSI-RNA structures. The Trp-rich peptide motifs were optimized for specific binding on spot synthesis peptide membranes. The best binding peptide was expressed intracellularly in fusion with RFP or linked to a protein transduction domain (PTD) for intracellular delivery. The effects on virion production were analyzed using pseudotyped lentiviral particles. Results: After positive and negative selection rounds, phages binding specifically to PSI-RNA were identified by ELISA. Peptide inserts contained conserved motifs of aromatic amino acids known to be implicated in binding of PSI-RNA by the natural Gag ligand. The filter assay identified HKWPWW as the best binding ligand for PSI-RNA, which is delivered into several cell lines by addition of a PTD. Compared to a control peptide, the HKWPWW peptide inhibited HIV-1 replication as deduced from reduced titers of culture supernatants. As HKWPWW also binds to the TAR-RNA like the natural nucleocapsid PSI-RNA ligand, the effect on Tat-TAR inhibition will also be analyzed. Currently T-cell lines are established which stably express HKWPWW as well as a control peptide, which will be infected with HIV-1 to monitor the ability of HKWPWW to inhibit wild type HIV-1 replication. Conclusion: The selection of a peptide ligand for PSI-RNA able to inhibit HIV-1 replication proves the suitability of the phage display technology for the selection of peptides binding to RNA-structures. This enables the indentification of peptides serving as leads to interfere with additional targets in the HIV-1 replication cycle.
In an effort to link quantitative morphometric information with molecular data on the population level, we have analysed 19 populations of the conchologically variable land snail Candidula unifasciata from across the species range for variation in quantitative shell traits and at the mitochondrial 16S ribosomal (r)DNA locus. In genetic analysis, including 21 additional populations, we observed two fundamental haplotype clades with an average pairwise sequence divergence of 0.209 ± 0.009 between clades compared to 0.017 ± 0.012 within clades, suggesting the presence of two different evolutionary lineages. Integrating additional shell material from the Senckenberg Malacological Collection, a highly significant discriminant analysis on the morphological shell traits with fundamental haplotype clades as grouping variable suggested that the less frequent haplotype corresponds to the described subspecies C. u. rugosiuscula, which we propose to regard as a distinct species. Both taxa were highly subdivided genetically (FST = 0.648 and 0.777 P < 0.001). This was contrasted by the partition of morphological variance, where only 29.6% and 21.9% of the variance were distributed among populations, respectively. In C. unifasciata, no significant association between population pairwise FST estimates and corresponding morphological fixation indices could be detected, indicating independent evolution of the two character sets. Partial least square analysis of environmental factors against shell trait variables in C. u. unifasciata revealed significant correlations between environmental factors and certain quantitative shell traits, whose potential adaptational values are discussed.
Ribosomal proteins are assumed to stabilize specific RNA structures and promote compact folding of the large rRNA. The conformational dynamics of the protein between the bound and unbound state play an important role in the binding process. We have studied those dynamical changes in detail for the highly conserved complex between the ribosomal protein L11 and the GTPase region of 23S rRNA. The RNA domain is compactly folded into a well defined tertiary structure, which is further stabilized by the association with the C-terminal domain of the L11 protein (L11ctd). In addition, the N-terminal domain of L11 (L11ntd) is implicated in the binding of the natural thiazole antibiotic thiostrepton, which disrupts the elongation factor function. We have studied the conformation of the ribosomal protein and its dynamics by NMR in the unbound state, the RNA bound state and in the ternary complex with the RNA and thiostrepton. Our data reveal a rearrangement of the L11ntd, placing it closer to the RNA after binding of thiostrepton, which may prevent binding of elongation factors. We propose a model for the ternary L11–RNA–thiostrepton complex that is additionally based on interaction data and conformational information of the L11 protein. The model is consistent with earlier findings and provides an explanation for the role of L11ntd in elongation factor binding.
In the inundation area - the basin of the former larger Lake Chad - a special type of sorghum is grown on the clay soils (firgi). This dry-season guinea corn is also called dwarf sorghum or masakwa. In Kanuri, the dominant language in the region, sorghum is called ngawuli. The dry-season types are called ngawuli firgibe (lit. translated: sorghum of the firgi). During the dry season when the natural vegetation becomes dry and yellow, masakwa fields appear in prominent green covering large areas of the clay plains. The most important natural factor for this specialized dry season cropping is the presence of soils with a high clay content. For a better understanding of masakwa and its related issues, a multidisciplinary sub-project (G1) has been established within the SFB 268 (Joint Research Project: History of Culture and Language in the Natural Environment of the West-African Savannah). This project in which all disciplines participate is entitled: "Natural basis for masakwa cultivation and its meaning for the settlement history of the clay plains (firgi) in the Chad basin".
Während über Flora und Vegetation der Wälder, Savannen und Äcker Westafrikas zahlreiche Veröffentlichungen vorliegen, hat man sich mit der ruderalen Flora und Vegetation der Siedlungen bisher nur wenig beschäftigt. Im Rahmen der Forschungen des SFB 268 wurde daher in zwei Ortschaften von Burkina Faso eine Bestandsaufnahme der spontan im Siedlungsbereich und in seiner engeren Umgebung an Ruderalstandorten auftretenden Pflanzenarten durchgeführt, wobei, gemäß den Zielen des SFB 268, auf eine interdisziplinäre Relevanz der Ergebnisse Wert gelegt wurde. Daher standen die Fragen nach der Nutzung der Spontanflora durch die Bevölkerung im Vordergrund des Interesses. In der vorliegenden Arbeit wird über die für die menschliche Ernährung genutzten krautigen Wildpflanzen des Siedlungsbereiches berichtet.
The investigations carried out within the project in NE-Nigeria since 1989 have been focussing on the late Pleistocene and Holocene landscape development of the south eastern Chad basin. Areas of interest include palaeodune fields, clay plains and former beach ridge systems of Lake Chad. Transgressions and regressions of Lake Chad played an important role in the younger landscape history of NE-Nigeria and have also caused great environmental changes. The term „Megachad“ is well known and describes an enormous lake with an extension comparable with the Caspian Sea of today. The term „Microchad“ stands for the other recent extreme in terms of the lake dimensions varying during the times. Environmental changes in the surroundings of Lake Chad are closely connected with transgressions and regressions of the lake. These lake level changes can be climatically induced as well as non-climatically, due to human impact. Nearly all land units have more or less been influenced by the lake, spatially as well as temporally. It is important, though, to notice the scales of the changes. Some changes took place in a millennial scale, some in the scales of centuries or decades, and at least – as can be observed every year – in a seasonal scale.
Numerous ecologists postulate that West African savannas are mostly the result of degradation of formerly closed forests. This hypothesis can only be tested by palaeoecological investigations. The palynological results summarised in this paper document the history of the Sudanian and Sahelian savanna of NE-Nigeria during the last 11.500 years (uncal. BP). Both sites investigated provide evidence for the persistence of savanna throughout the entire Holocene. Patches of closed dry forest may have occurred, but never completely displaced the savanna vegetation. Humid conditions during the early and mid Holocene (from 10.000 BP onwards) caused a rapid spread of Guinean and Sudanian taxa into the northern vegetation zones. A slow return to drier climatic conditions between ca. 6800 BP and ca. 5500 BP can be recorded at both sites. Finally, between 3800 BP and 3300 BP a strong aridification resulted in the establishment of the modern vegetation zones. In both the Sahelian and Sudanian zone the vegetational changes appear to have been primarily controlled by climatic changes, whereas the effects of human activities remain palynologically silent even for the late Holocene.
Two sites situated in the Sahelian and Sudanian zones of NE-Nigeria were chosen for pollen analysis. A sediment core from an interdunal depression in the eastern Manga Grassland provides information on the Holocene vegetation history of the Sahel between c. 9600-3400 B.P. The 3 m pollen record indicates an open savanna during the mid-Holocene. The presence of Sudano-Guinean taxa, which were mainly restricted to the interdunal depressions, points to more humid conditions. Already before c. 4000 B.P., a slow change towards drier conditions and the establishment of the modern Sahelian vegetation is visible in the diagram. This development was accompanied by high fire frequencies. A 16 m core from a crater lake (Lake Tilla) in the Sudanian zone of NE-Nigeria provides a pollen record which can be dated back to approximately 11-12000 B.P. Preliminary pollen spectra show a relatively constant pattern with a dominance of grass pollen even during the middle Holocene.
Im SW Burkina Fasos (sechs Monate Regenzeit und durchschnittlich über 1000 mm Niederschlag) wurden mehrere Trockenwälder auf ihr Artenspektrum und die Bodenverhältnisse hin untersucht. Die Waldformationen fallen durch die Dichte der Gehölzbedeckung, ihren Lianenreichtum und das fast vollständige Fehlen von Gräsern auf. Typische Gehölzarten sind Anogeissus leiocarpus, Diospyros mespiliformis und die Liane Saba senegalensis. Der dichte Strauchunterwuchs und die fehlende Grasschicht verhindern das regelmäßige Eindringen von Buschfeuern. Wegen der Dichte und des Alters der Bäume belegen diese Waldformationen, daß an den Standorten, zumindest für einen sehr langen Zeitraum, kein Feldbau betrieben wurde. Daher konnten sich, auch auf eher als ungünstig zu bewertenden Böden, Trockenwälder ausbilden, die zumindest in ihrer Physiognomie der potentiellen natürlichen Vegetation entsprechen. Jedoch finden sich in den Wäldern oft Spuren menschlicher Aktivitäten aus der Vergangenheit, so z.B. Steinsetzungen, Siedlungshügel und Gruben. Außerdem lassen sich vielfach Anzeichen einer rezenten Nutzung beobachten, so z.B. für die Entnahme von Werkholz, das Schneiteln mancher Baumarten zur Viehfuttergewinnung, gelegentliche Beweidung und das Sammeln von Wildpflanzen.
Les ferrières sont par définition les amas des déchets de la réduction du fer. De par son origine elles constituent des lithosols qui ont beaucoup évolué dans l’espace et dans le temps. A notre connaissance très peu d’études se sont penchées sur cette végétation qui couvre actuellement les sites de réduction du fer. L’inventaire floristique de plusieurs sites en zone soudanienne montre la fréquence de certaines espèces sur les ferrières. L’étude de la chorologie de toutes les espèces confondues ligneuses et herbacées, montrent que la plupart sont constituées par des espèces zoochores et quelques espèces anémochores. Elles sont disséminées principalement par les animaux d’élevage, par les oiseaux. Cette communication synthétise les données des différentes prospections et les premiers résultats de nos observations et analyses. Elle a deux objectifs : de montrer l’importance des activités anthropiques dans la formation du paysage végétal d’une part, et d’autre part de mettre en évidence le processus de colonisation des sols nus et des ferrières en zone soudanienne.
Au Sahel du Burkina Faso, le diagramme pollinique d'Oursi fournit des évidences sur l'apparition de l'agriculture, il y a environ 3000 ans. A partir de ces faits, le but principal des recherches archéologiques dans le cadre du SFB 268 était de trouver et de fouiller des sites qui seraient à même d'apporter des informations sur cette période décisive autour de 3000 ans avant l'actuel. Pour cela, nous avons concentré notre travail sur les provinces du Séno et plus particulièrement de l'Oudalan. Le paysage de cette région est marqué par des dunes qui s'organisent grossièrement en cordons d'orientation nord-est/sud-ouest à travers notre terrain.
La variation dans l'utilisation des ressources végétales est liée aux changements de mode de vie. Le Burkina Faso fait parti des pays habituellement indiqués comme en voie de développement. Ce qualificatif est vrai si on ne regarde que la croissance technologique. Le pays accuse certes un retard sur ce plan, mais la population sait bel et bien développer son intelligence humaine pour faire face à telle ou telle situation. Ainsi, devant une mauvaise récolte, personne n'acceptera de mourir de faim tant que dans l'environnement naturel existeront tous les éléments nécessaires pour survivre: l'eau, les plantes et les animaux. A ce moment-là, le mode de vie change; il ne s'agit plus de récolter, mais il s'agit de prélever, de cueillir. La cueillette, c'était un mode de vie dans l'époque préhistorique. L'homme se rabat sur tout ce qui peut fournir un aliment substantiel: les gros tubercules, les feuilles les plus tendres, les fruits et les graines. Si les trois dernières catégories d'aliments ne posent pas trop de problèmes, la première et les autres organes souterrains sont en général toxiques. Et là encore, l'homme va développer son intelligence pour éliminer cette toxicité mais après une grande perte en vie humaine. Dans le but de savoir un peu plus sur ces différentes périodes de disette et de famine, nous avons mené une enquête à Ouahigouya (Yatenga) et à Toma (Sourou), deux zones qui appartenaient à un même cercle pendant l'époque coloniale, période de la suppression de la Haute-Volta. Par ailleurs nous voulons vérifier la marge d'erreur qu'on peut avoir lors d'une enquête ethnobotanique en se situant dans le temps et l'espace. Cette communication entre en plus dans le cadre de nos travaux de recherche sur l'histoire de la végétation et de l'utilisation des ressources végétales.
L'homme vivant de la cueillette existe toujours au Burkina Faso. Les espèces que nous allons exposer par la suite ne font pas l'objet d'une culture. La plupart certes sont des espèces protégées lors des défrichements. Elles caractérisent souvent les différents faciès de savane rencontrés à travers le pays. Certaines ont des usages généralisés en temps normal, d'autres le sont en temps de disette ou de soudure. Ces espèces ligneuses sont à usages culinaires par leurs feuilles, leurs graines et leurs exsudats. Leur composition chimique montre un certain équilibre énergétique à la consommation et permet de comprendre la santé de nos paysans malgré ce qu'on laisse entendre sur la pauvreté et la sous-alimentation. Dans le cadre de nos travaux pour une meilleure connaissance des espèces tant sur le plan taxonomique, biologique qu'ethnobotanique, nous avons mené depuis cinq ans une enquête sur les différentes utilisations des espèces ligneuses. Le présent travail concerne particulièrement les espèces ligneuses dont certains organes sont utilisés dans alimentation humaine. Nous nous sommes limités à ne parler que d'une vingtaine d'espèces.
La métallurgie du fer jouit d'un regain d'intérêt en Afrique depuis une décénnie. Alors que les diffusionistes et les antidiffusionistes se sont affrontés dans les années 1970, on assiste aujourd'hui à une nouvelle fièvre du "fer" où les chercheurs, mettant de côté l'idéologie, travaillent avec acharnement sur les fourneaux de réduction et sur toutes les traces de cette métallurgie. Les résultats obtenus sont déja impressionnants. L'environnement constituent aussi, désormais, une préoccupation majeure des chercheurs. Les recherches en paléométallurgie au Burkina Faso n'échappent pas totalemennt à cette critique. C'est pour attirer plus d'attention sur l'important complément sociologique des investigations archéologiques que nous proposons en ces lignes les quelques informations relatives aux conditions sociales des forgerons, potiers et potières, réunis dans plusieurs nationalités du Burkina Faso par une sorte de communauté de destin: les arts du feu.
Le Burkina Faso est situé dans la zone soudano-sahélienne où les cultures sont quelquefois aléatoires; dans ces conditions les plantes ligneuses occupent une place importante dans la vie socio-économique du pays. Pourtant, une sécheresses climatique persistante de ces dernières décennies a entraîné une mortalité massive de ces ligneux surtout dans la zone sahélienne. Cette forte dégradation des ressources naturelles est variable d’une zone géo-graphique à une autre pour des raisons diverses. Si les phénomènes généraux de cette dégradation de la végétation et leurs causes sont souvent décrits par de nombreux auteurs, il existe par contre très peu de connaissances détaillées et spécifiques en fonction des zones géographiques sur la menace qui pèse sur les différentes espèces. Dans l’absence de bases scientifiques fiables sur la végétation du passé pour chacune des régions qui permettrait ainsi d’établir avec précision la liste des espèces disparues, il est donc nécessaire de se baser sur la perception de la population rurale qui se trouve bien placée pour déceler tout changement dans la flore. Dans ce contexte, cette étude menée auprès des gourmantchés, vise surtout à identifier les espèces disparues ou celles en voie de disparition dans les différentes zones écologiques à l’est du Burkina Faso; en outre, elle aborde les raisons évoquées par ces populations pour expliquer cette menace qui pèse sur chacune des espèces. L’enquête a enfin contribué à connaître les solutions envisagées par ces dernières pour anéantir ou réduire la menace.
L’inventaire floristique du Burkina Faso est loin d’être clos. Les récentes investigations floristiques ont permis de recenser un grand nombre d’espèces qui n’avaient jamais été mentionnées sur la liste floristique nationale. Une partie de ces espèces sont d’ailleurs guinéocongolaises. Cet inventaire a concerné les aires classées et protégées situées dans le secteur Sudsoudanien. Les richesses floristiques se retrouvent concentrées dans ces aires classées et protégées car ce sont des formations qui jouissent d’une relative bonne gestion par rapport aux autres aires non protégées qui ont été fortement dégradées par l’homme. L’objectif de cette communication est de donner les informations issues de ces différentes investigations sur l’état de connaissance de la diversité végétale du Burkina Faso avec un accent particulier sur le mode de gestion et les utilisations de quelques espèces de la zone sud soudanienne.
Kagbeni and its irrigated oasis are surrounded by subdesert dwarf scrubland. In the present study, a list of 78 species of vascular plants is presented for Kagbeni and its immediate surroundings, supplemented with data on the distribution of the species within the entire Mustan District. The data are arrived from own investigations and the geobotanical literature. A phytogeographical analysis shows the prevalence of western over eastern elements. Species with a wide distribution in Eurasia, which constitute one third of the total flora of Kagbeni, are of great importance as weeds on arable fields and in ruderal places within the irrigated oasis. Their occurrence is closely related to human activity. Presumably, most of these weeds have reached the area under study in connection with agriculture a long time ago. Weeds from the New World, although recorded in other villages of Mustan District, have not been found in Kagbeni. The weed vegetation of Kagbeni is documented by nine vegetation releves, and is compared to releves from Jomsom and Mzrpha. A floristic gradient from south to north that has been detected by earlier investigations throughout the whole district can be reproduced at the local scale. With regard to the weed flora, the effects of different crops are minimal, compared to effects of altitude and other factors related to altitude.
Changes in settlement pattern and culture - the process of down-hill migration in Tula, Bauchi State
(1996)
The process of down-hill migration of the Tula people started during the 1920s and has not yet finished. The resulting present situation might give information how far terraces play any role in the economy, ecology and ideology of the Tula. Approaching this question from a socio-agricultural point of view some facts which indicate the pertaining or overcoming of traditional structures will be presented. In the following the land tenure system, the adoption of innovations and the role of women in agriculture will be discussed comparatively for Tula Wange and Tula Baule on the plateau, Fantami, which is generated by down-hill dwellers of Tula Wange, with its more or less bad farming conditions on shallow sandy soils and Kaltin, where the down migrants of Tula Baule settle in a more fertile area. Tula Wange numbers around 2000 households, Baule 1000, Fantami about 200 and Kaltin 350 of which the sample survey includes 15% in the plateau sites and 25% in the plain settlements.
Notre communication porte sur le thème suivant: "Anthropisation du couvert végétal dans la province de Namentenga et ses conséquences socioéconomiques: cas de la région de Tougouri, en zone subsahélienne" (centre-nord du Burkina Faso). A travers cette étude de cas, nous voulons attirer l'attention sur les problèmes environnementaux du Burkina Faso. En effet, les déficits pluviométriques cumulés, depuis quelques décennies, sont à l'origine de la dégradation des écosystèmes. La surexploitation des terres entraîne également l'épuisement des sols et la diminution des ressources végétales. Un telle situation n'est pas sans conséquence sur les activités socioéconomiques des populations. Le plan de notre communication sera donc comme suit: 1. Présentation du degré-carré de Tougouri, sur le plan physique 2. Dynamique du couvert végétal sous l'action anthropique, et les conséquences socioéconomiques 3. Perspectives d'avenir
La coupure que l'on constate dans les forêts denses africaines au niveau du Togo et du Bénin soulève de nombreuses questions sur les rapports forêt/savane au cours des derniers millénaires. Le projet Dahomey Gap vise à y répondre, par une approche pluridisciplinaire intégrant botanique et histoire de la végétation dans le Sud-Bénin et le Sud-Ouest du Nigéria. A partir de travaux déjà avancés sur la végétation du Bénin et des premières prospections palynologiques, quelques aspects du projet sont exposés ici: tels la caractérisation des différentes formations forestières du Bénin, les premiers résultats sur l'histoire holocène de la végétation du Sud-Bénin (mangroves, forêts, savanes) enregistrée depuis près de 7000 ans dans les lagunes.
Population structure was estimated in a continuous population of a small land snail (Trochoidea geyeri). Mark-recapture experiments and randomly amplified polymorphic DNA analyses indicate that the population structure can be described by the isolation by distance model of Wright (1946). Estimates of density and dispersal suggest a neighbourhood size of 70-208 individuals on an area of 13-21 m². A principal component analysis of the randomly amplified polymorphic DNA data reveals clinal variation of genetic composition across the population, as predicted by the neighbourhood concept. An analysis of molecular variance indicates substantial genetic structuring. Comparisons of the genetic distances, expressed as euclidean distances among individuals, versus the geographic distance between sampling sites yield a highly significant positive correlation (Mantel test: r = 0.567, p<0.0001). The revealed pattern of populational subdivision on a microgeographic scale seems to be one of the principal processes generating and maintaining genetic diversity within populations of small land gastropods.
In the present study the population genetic structure of the terrestrial snail Pomatias elegans was related to habitat structure on a microspatial scale. The genetic variability of 1607 individuals from 51 sampling sites in five different populations in Provence, France, was studied with an allozyme marker using population genetic methods, Mantel tests and spatial autocorrelation techniques were applied to different connectivity networks accounting for the structural features of the landscape. It is suggested that the population structure is, to a large extent, a function of the habitat quality, quantified as population density, and of the spatial arrangement of the habitat in the landscape and not of the geographical distance per se. In fragmented habitats, random genetic drift was the prevailing force for sampling sites separated by a few hundred meters.
Background: Growth rate is central to the development of cells in all organisms. However, little is known about the impact of changing growth rates. We used continuous cultures to control growth rate and studied the transcriptional program of the model eukaryote Saccharomyces cerevisiae, with generation times varying between 2 and 35 hours.
Results: A total of 5930 transcripts were identified at the different growth rates studied. Consensus clustering of these revealed that half of all yeast genes are affected by the specific growth rate, and that the changes are similar to those found when cells are exposed to different types of stress (>80% overlap). Genes with decreased transcript levels in response to faster growth are largely of unknown function (>50%) whereas genes with increased transcript levels are involved in macromolecular biosynthesis such as those that encode ribosomal proteins. This group also covers most targets of the transcriptional activator RAP1, which is also known to be involved in replication. A positive correlation between the location of replication origins and the location of growth-regulated genes suggests a role for replication in growth rate regulation.
Conclusion: Our data show that the cellular growth rate has great influence on transcriptional regulation. This, in turn, implies that one should be cautious when comparing mutants with different growth rates. Our findings also indicate that much of the regulation is coordinated via the chromosomal location of the affected genes, which may be valuable information for the control of heterologous gene expression in metabolic engineering.
Length variations of repetitive sequences in different AT-rich loop-coding regions of mitochondrial 16S rDNA in two gastropod species were discovered during intraspecific haplotype surveys. Examination of the discrete length variation of the basic repeat unit in a phylogenetic framework led to the conclusion of a microsatellite-like mutational dynamic. The observations suggest that the presence of a repetitive sequence structure alone is sufficient to trigger this dynamic.