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The canopy spiders of the floodplain forest in Leipzig have become a focus of ecological studies in recent years. In 2006 we sampled 30 tree canopies in the ‘Burgaue’ nature reserve with pyrethrum knock-down fogging, recording 502 adult spiders belonging to 48 species and 11 families. Based on these data and the results of a previous fogging study, the studied spider community was dominated by forest and forest-edge species with a preference for the shrub and canopy strata as well as by spiders of the web spider feeding guild. The community structure was typical for arboreal spider communities from northern temperate forests but very different from communities in the tropics. Species richness and evenness were similar to the old growth near-primary Białowieża Forest in Poland. The checklist of 96 canopy spider species of the floodplain forest of Leipzig includes 54 additions to the spider fauna of Leipzig and vicinity by recent canopy studies and eight first canopy records for Leipzig from our field work. The theridiid Dipoena torva (Thorell, 1875) was recorded for the first time in Saxony. The floodplain forest of Leipzig sustains a large and species-rich arboreal spider community and is thus a valuable habitat for a large proportion of endangered species (12%).
The Alborz Mountains are forming a ~100 km wide, E-W trending mountain chain where individual summits are up to 5000 m in elevation. The Alborz Mountains range are part of the Alpine orogen and are straddling a 2000 km wide area S of the Caspian Sea. The rocks of the Alborz Mountains consist of Neogen sediments, which are affected by folding and faulting. In the western part of the Alborz Mountains the folds and faults are trending NW-SE, whereas in the eastern part they are trending NE-SW. GPS data confirm N-S shortening including dextral strike-slip along ESE-WNW trending faults, and sinistral strike-slip along ENE-WSW trending faults. The present thesis is focusing on the active Garmsar salt nappe, the fragmented roof of which is pierced by rock salt which extruded near the front of the Alborz Mountains Range. During the past 5 m.y. the front of the Alborz chain migrated towards SSW on top of the salt of the Garmsar basin. The salt was squeezed towards SSW and took place at the Great Kavir. The extruded salt is forming the Eyvanekey plateau between the cities of Eyvanekey and Garmsar. Both the Garmsar salt nappe and the Eyvanekey plateau are dextrally displaced for ca. 9 km along the Zirab-Garmsar fault. Structural analyses of the Garmsar salt nappe indicate three different groups of joints which are trending perpendicular and parallel to the local mechanical anisotropy. The folds of the study area are congruent (type 2 and 3 after Ramsay) resulting from viscose inhomogeneous flow. InSAR-Investigations suggest the Alborz Mountains to be lifted up by ca. 1 cm/a, while horizontal shortening is active at a rate of 8 ±2 mm/a. These values are consistent with GPS data. Based on nine „Advanced Synthetic Aperture Radar“ (ASAR) scenarios, produced by the ENVISAT satellite of the European space agency between 2003 and 2006, we used interferograms to map the displacement via 22 increments during 2 – 18 months. The results suggest that the topographic height of the surface of the salt is changing at a rate which is controlled by the season. The displacement ranges from subsidence at -40 to -50 mm/a to uplift of 20 mm/a. In order to investigate the time-dependent deformation with high spatial resolution, we used algorithms which are based on data of small base lines (SBAS). The resulting interferometric SAR time series analyses also suggest that the study area is largely subsiding at a rate that is controlled by the seasons. The map with the averaged LOS deformation velocities, on the other hand, suggests the subsidence to increase from the upper part of the salt nappe towards deeper topographic 5 levels of the agricultural lowlands. The major part of subsidence is probably caused by the annual rainfall which results in subrosion of salt. The spatial changes in the subsidence rate are probably controlled by the distribution of fountains, mining activity at the margin of the salt glacier, and faults and fractures inside the salt. Striking seasonal imprints are obvious along the agricultural areas which are surrounding the Garmsar salt nappe. These areas are rapidly subsiding in summer and spring when groundwater is used for irrigations. The maximum rate of subsidence (40-50 mm/a) is located E and W of the Eyvanekey plateau, where large areas are irrigated. The maximum displacement is 20 mm/a in the farmland and 5 mm/a in the center of the salt nappe. Depth estimates using Euler deconvolution method for gravimetric and magnetic data suggest the salt to extrude from a depth less than ca. 2000 m. The gravity field of the study area is characterized by strong anomalies in the SW and weak anomalies in the NE. A considerable negative anomaly in the N indicates that the northern part subsided, whereas the southern part was lifted up. The seismic data show three major horizons inside the Miocene sediments: the Lower Red Formation, the Qom Formation, and the Upper Red Formation. The western part of the study area seems to be free from salt domes. The layers of the upper part of the Qom Formation show thinning along the NE and NW trending faults. In some areas the seismic reflectors indicate steep faults close the saddle of the folds. NE-SW-, NW-SE and E-Wtrending faults prevail. Analogue experiments have been carried out to extend our knowledge about the evolution of the Garmsar salt dome. We used a scaled model (34 cm * 25 cm * 2.5 cm) that was shortened perpendicular to its long side. The wedge shape of the Alborz Mountains was simulated by a wedge consisting of Styrofoam. Rock salt was simulated using Polydimethylsiloxan (PDMS), a linear viscous material with a viscosity of 2.3*104 Pa s and a density of 0.96 g/cm3 at room temperature. Other sediments were modeled using dry quartz sand. The experimental results can be used to simulate the structural evolution of the study area: The Alborz deformation front was emplaced on top of the salt rocks in the Garmsar area while migrating towards SSW. A salt basin and a salt extrusion have also been produced in the model. Cross sections through the wedge shaped analogue model indicate N- and S-dipping reverse faults, which are in line with the wedge shape of the Alborz chain. Moreover, ENE-WSW trending sinistral and ESE-WNW trending dextral strike-slip faults led to N-S shortening during the Miocene. Structural marker horizons, 6 which have been turned into Z-folds on the western fold limbs and to S-folds on the eastern fold limbs, are comparable with the folds of the study area. Solving the problem of waste is one of the central tasks of environmental protection. It is becoming increasingly difficult to find suitable sites that are acceptable to the public. Salt and salt formations have relevant properties to be utilizing as a repository for each kind of waste. The favorable properties make rock salt highly suitable as a host rock, in particular for nonradioactive and radioactive wastes. The Qom and Garmsar basins are the nearest salt diapirs to the Tehran province, and there are suitable repositories for waste disposal. Based on surface and subsurface data, the Garmsar salt diapir has been investigated as a case example for its suitability as a host and repository for various types of waste. The data used are based on field studies, interferometry, and geophysical investigations. The results of this study suggest the deep bedded salt of the Garmsar Salt Basin to be an appropriate host for the deposition of industrial waste. Rock salt of surficial layers or domes, on the other hand, is not regarded as an appropriate candidate for waste disposal.
Background: Clock genes and their protein products regulate circadian rhythms in mammals but have also been implicated in various physiological processes, including bone formation. Osteoblasts build new mineralized bone whereas osteoclasts degrade it thereby balancing bone formation. To evaluate the contribution of clock components in this process, we investigated mice mutant in clock genes for a bone volume phenotype. Methodology/Principal Findings: We found that Per2Brdm1 mutant mice as well as mice lacking Cry2-/- displayed significantly increased bone volume at 12 weeks of age, when bone turnover is high. Per2Brdm1 mutant mice showed alterations in parameters specific for osteoblasts whereas mice lacking Cry2-/- displayed changes in osteoclast specific parameters. Interestingly, inactivation of both Per2 and Cry2 genes leads to normal bone volume as observed in wild type animals. Importantly, osteoclast parameters affected due to the lack of Cry2, remained at the level seen in the Cry2-/- mutants despite the simultaneous inactivation of Per2. Conclusions/Significance: This indicates that Cry2 and Per2 affect distinct pathways in the regulation of bone volume with Cry2 influencing mostly the osteoclastic cellular component of bone and Per2 acting on osteoblast parameters.
The Coming African hour is not a slogan, nor wishful thinking. It is a conclusion that derives from an insightful analysis of the current situation pertaining on the continent. Several African scholars, coming from different regions and academic backgrounds are elaborating ideas and arguments in order to explain the constraints and to illustrate the opportunities. The result of that scientific gathering is a book that synthesizes and renews the reflections on development. What is at stake is not to be pessimistic or optimistic about Africa. The epistemological challenge is to understand what is going on. By focusing on converging and diverging African realities, on the issues of state, civil society, gender and development strategies, the authors of the book show under which conditions the African hour is coming. At that level, the commitment for political science meets the commitment for Africa. The main success of this book is to overcome the preconceived ideas and self-fulfilling prophecies about Africa. Here, the analysis avoids the trap of indulgence; then hope is based on truth. Consequently, the coming African hour is not inescapable: it is, as analyzed, a possibility that its achievement depends on institutional, human, political, social and economic factors.
The concert for Bangladesh
(2010)
Hungersnöte, unzählige Millionen Kriegsopfer, Massenobdachlosigkeit und Flüchtlingswellen in zweistelliger Millionenhöhe - so präsentierten sich 1971 die Folgen des Krieges in Bangladesch. Weltweit berichtete die Presse von den dramatischen Elendszuständen. Eine Fülle von Hilfsorganisationen rief die Bevölkerung der Industriestaaten zur Hilfe auf. In diesem Kontext entstand auch ein Impuls, der den Gestus innergesellschaftlicher Opposition und eines allgemeinen Protestes gegen die moralischen und politischen Handlungsideale der westlichen Gesellschaften, der so typisch für die Rockmusik der späten 1960er und frühen 1970er zu sein schien, mit der Zuwendung zu den Zuständen in den Ländern der Dritten Welt verband. Der in den 1970ern so wichtige Nord-Süd-Konflikt war in der Rockmusikkultur angekommen. Das Concert for Bangladesh ging als erstes großes Wohltätigkeitskonzert in die Popgeschichte ein, wurde zum Vorbild vieler weiterer Großveranstaltungen (darunter die beiden Mammutveranstaltungen Live Aid, 1985, und Live 8, 2005). Angeleitet von dem Wunsch, die Situation der Bangladeschflüchtlinge zu verbessern, wandte sich der indische Musiker Radi Shankar an seinen Freund, den Ex-Beatle George Harrison. Dieser komponierte daraufhin die Benefiz-Single Bangla Desh und organisierte gemeinsam mit Shankar innerhalb von fünf Wochen zwei Konzerte, deren Erlöse der Flüchtlingshilfe zugute kommen sollten. Die beiden Konzerte, die am Mittag und Abend des 1. August 1971 im New Yorker Madison Square Garden vor insgesamt 40.000 Zuschauern stattfanden, wurden sowohl für ein Livealbum mitgeschnitten als auch gefilmt. Der Konzertfilm, der im Folgejahr erschien, enthielt im Gegensatz zu dem Album nicht die gesamte Setlist der Konzerte, dokumentiert dafür aber in einigen Szenen Phasen der Vorbereitung der beiden Shows.
The Crabs of Bangui
(2010)
Every man lives for himself, using his freedoms to attain his personal aims, and feels with his whole being that he can at any moment perform or not perform this or that action. The higher a man stands in the social scale, the more connections he has with others and the more power he has over them, the more conspicuous is the predestination and inevitability of every act he commits. Upon this philosophy, a former banker, Hansel Bolingo, suddenly finds [or makes] himself the regional representative of a Chinese firm that deals in crabs in Bangui. This catapults him into a position of instant wealth. His mouth-watering affluence draws immediate attention while his hypnotic powers cause hundreds of [not-so-honest]citizens to clamour for shares from which he builds up a huge fortune. But he soon discovers that he cannot deceive everybody all the time.
Studies have shown that the negative effects of credit market inefficiencies are most felt by smaller firms. Therefore, in countries such as Uganda, where micro enterprises are at the bottom of the economic pyramid, moral hazard and adverse selection severely affect their ability to access formal credit hence limiting their growth potential. Microfinance has been heralded for its use of innovative lending methods to improve access to credit. The last decade has witnessed an unprecedented increase in the outreach of micro lending institutions and the development of financial products suited to the needs of the economically active poor, who often, are unable to obtain credit from mainstream financial institutions. This book analyzes the law and economics theories on access to credit and enterprise finance and based on case studies in Uganda, presents empirical findings of the promise and limits of contractual innovations in micro credit.
This paper investigates the accuracy and heterogeneity of output growth and inflation forecasts during the current and the four preceding NBER-dated U.S. recessions. We generate forecasts from six different models of the U.S. economy and compare them to professional forecasts from the Federal Reserve’s Greenbook and the Survey of Professional Forecasters (SPF). The model parameters and model forecasts are derived from historical data vintages so as to ensure comparability to historical forecasts by professionals. The mean model forecast comes surprisingly close to the mean SPF and Greenbook forecasts in terms of accuracy even though the models only make use of a small number of data series. Model forecasts compare particularly well to professional forecasts at a horizon of three to four quarters and during recoveries. The extent of forecast heterogeneity is similar for model and professional forecasts but varies substantially over time. Thus, forecast heterogeneity constitutes a potentially important source of economic fluctuations. While the particular reasons for diversity in professional forecasts are not observable, the diversity in model forecasts can be traced to different modeling assumptions, information sets and parameter estimates. JEL Classification: C53, D84, E31, E32, E37 Keywords: Forecasting, Business Cycles, Heterogeneous Beliefs, Forecast Distribution, Model Uncertainty, Bayesian Estimation
This book critically discusses missionary Christianity and colonization in Africa as twin enterprises with a common ambition. While the colonialist set out to invest capital and reap profit, the missionary desire was to tend and turn African souls from damnation. It was this desire that drove the missionaries into the interior, propelled by the belief that no land was too remote to escape their attention and vigilance. It equally kept missionary zeal buoyant. The clarification of the concept of salvation within the Roman Catholic Church during the Vatican II Council set in motion the current lethargy that has in some places crippled the mission itself. In retrospect, one can begin to wonder why Africans became Christians. What reasons motivated the early adherents to cling to this foreign religion? Were there some internal deficiencies in African traditional religions, which the Africans hoped to remedy by joining the new religion? Or was it just part of the wholesale flirting with whatever was foreign and perceived to be modern? What baits were used by the missionaries to entice Africans? Christianity posed a danger to many of the time-honoured answers to African problems. These were the values Africans converting to Christianity were expected to abandon. Why have Christians continually returned to their abandoned roots in time of crisis? This moving, well argued, richly documented and empirically substantiated study concludes by cautioning against the stubborn drive at radical conversion to Christianity with scant regard to the imperatives of enculturation.