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Scharben und Scharbenfischerei : nach einem Vortrag in der "Ornithologischen Gesellschaft in Bayern"
(1938)
The re-emergence of tuberculosis in its present-day manifestations - single, multiple and extensive drug-resistant forms and as HIV-TB coinfections - has resulted in renewed research on fundamental questions such as the nature of the organism itself, Mycobacterium tuberculosis, the molecular basis of its pathogenesis, definition of the immunological response in animal models and humans, and development of new intervention strategies such as vaccines and drugs. Foremost among these developments has been the precise chemical definition of the complex and distinctive cell wall of M. tuberculosis, elucidation of the relevant pathways and underlying genetics responsible for the synthesis of the hallmark moieties of the tubercle bacillus such as the mycolic acid-arabinogalactan-peptidoglycan complex, the phthiocerol- and trehalose-containing effector lipids, the phosphatidylinositol-containing mannosides, lipomannosides and lipoarabinomannosides, major immunomodulators, and others. In this review, the laboratory personnel who have been the focal point of some to these developments review recent progress towards a comprehensive understanding of the basic physiology and functions of the cell wall of M. tuberculosis.
In a series of excellent studies, DENNIS and co-workers, 1962, have described a new method for left heart bypass without thoracotomy. A cannula was placed in the left atrium via the superior caval vein and the right atrium, according to a method described by BEVEGARD et al., 1960, where the atrial septum is punctured with a needle from the superior vena cava. DENNIS et al. used a manually regulated roller pump for the left heart bypass. ...
Les microcèbes de l'espèce Microcebus murinus doivent leur succès évolutif à leurs capacités à s'adapter aux conditions climatiques et écologiques difficiles auxquelles ils ont à faire face. Ces adaptations concernent tous les systèmes de communication. La vision semble particulièrement performante dans le biotope de branches fines de cette espèce strictement nocturne. L'appréhension du monde extérieur par le sens du tact passe moins par les membres que par le museau, organe multisensoriel riche en terminaisons tactiles. Cependant, les échanges sociaux par signaux visuels et tactiles sont beaucoup plus l'ares que chez les simiens ou même que chez les prosimiens diurnes. Les seuils de détection gustative démontrent une sensibilité relativement faible pour les sucres et, pour les composés amers comme la quinine ou astringents comme les tanins, une variation saisonnière liée aux ressources du milieu. Les autres détecteurs de signaux chimiques - olfaction et sens voméronasal - sont particulièrement développés. Il s j agit de deux systèmes différents dont l'indépendance fonctionnelle a été démontrée. Chez le microcèbe, l'urine, dispersée grâce à des comportements de marquage extrêmement efficaces, joue un rôle social fondamental, notamment par toute une série d'effets de type phéromonal. Les émissions sonores se caractérisent par des fréquences élevées, en partie ultrasoniques. Le répertoire vocal comprend au moins huit types de vocalisations dont certaines, ayant, dans une population locale donnée, une partie de leur structure acoustique en commun, sont interprétées comme des dialectes. Au niveau interindividuel, certains cris de contact pourraient fournir, comme c'est le cas pour les traces urinaires, des repères suffisant à identifier l'émetteur et comatitere son état psychophysiologique. Cette revue montre que le microcèbe est un généraliste, chez qui tous les organes des sens sont bien developpés sans dominance ni spécialisation excessive de l'un d'entre eux. Elle montre, aussi que ce primate possède un développement cerebral suffisant pour répondre de manière originale aux contraintes de son environnement physique et social.
Sexual reproduction in yeasts has a survival function by providing an alternative to the vegetative processes when conditions are no longer conducive for growth. If both sexes are in the correct physiological state (usually under starvation conditions), then initiation of copulation involves the mutual induction of a sexual response. This response is mediated by diffusible compounds and by physical contact. Initial cell contacts between opposite mating types can be disrupted easily, but stronger intercellular bonds form later that result in the fusion of two cells into one. Union between mates involves mixing of parental gene pools. The new diploid organism or its subsequent offspring might be better equipped to survive in a new environment because they may contain new combinations of parental genes. Hence, sex is more advantageous to the survival of the species than it is to the individual organism. The purpose of this review is to compare the steps in the mating process in three species of yeasts. The various physiological factors, events and regulatory phenomena that are part of the mating process will be described for Hansenuta wingei, Schizosaccharomyces pombe and Saccharomyces cerevisiae in Sections II, III and IV, respectively. Then, in Section V, the similarities and differences among these yeast systems will be discussed. Emphasis in this article will be on recent observations since reviews of earlier work are available for each mating system (for H. wingei: Crandall and Brock, 1968; Crandall and Caulton, 1975; for Schizosacch. pombe: Leupold, 1970; Gutz et at., 1974; for Sacch. cerevisiae: Fowell, 1969a, b; Bilinski et at., 1975; Sena et at., 1975). For a comprehensive review of conjugation in all yeasts, fungi and other micro-organisms, consult Crandall (1977). The three yeasts to be reviewed here are quite diverse in terms of their ecological niches, metabolism, morphology and life cycles. Therefore, for a better understanding of the physiology of sexual reproduction in these organisms, it is necessary first to consider these characteristics. A more detailed description of each yeast is given in Lodder (1970).
A synthesis of the Carabid fauna of the Central and Eastern Alps and Pre-Alps, from a biogeographical point of view, is presented. Only the Italian side of the Alpine chain is considered, from the basin of the Toce river to the Trieste and Gorizia Karst. Main features of the landscape are: 1. an ancient orogenetic history and evolution, that made this area available to the colonization by carabids, of both gondwanaland and laurasian lineages, since the lower Tertiary; 2. a marked geological and geo-morphological complexity, with highest elevation at Pizzo Bernina m 4.049; 3. the presence of a very developed, dolomitic-calcareous and markedly carsified prealpine belt, rich of deep and large hypogean systems (also at high altitude), which makes this area highly different, from the geo-morphological point of view, from the Western Alps; 4. the geographic position, as a mountain chain of some 750 kms between central Europe and the Padanian plain, connected with the Caravanche and the Dinaric chain and close to the Adriatic sea in me Eastern part; 5. finally, a puzzled climate situation, that includes xero-thermic areas (500-700 mm of rain per year, also in some intra-alpine sectors), close to highly rainy areas - more than 2.500 mm per year - in the westernmost and easternmost parts of the chain. Thus, like in the Western Alps, sub-mediterranean vegetation types, dose to cool-moist forests, coexist with high-altitude environments above the timber line. These facts explain the heterogeneity, the richness, the variety, and the interest of the carabid fauna of the area: the highest number of species (658) ascertained so far, i.e. 112 of the whole Italian carabid fauna and about 115 of the carabid fauna cited so far for the Europe in politic sense, fi·om me Canary islands to the Urals; the high number of euri- or stenoendemites (204, i.e. abour 31 % of the species, 3/5 of which concentrated in the pre-alpine belt), and the complex origins and/or affinities of different taxa. A large number of species (174, i.e. 26%) belongs to European chorotypes (European, South-European or typically Alpine), and even more (255, i.e. 38%) to Holarctic (Holarctic, Palaearccic, West-Palaearctic, Asiatic-European, Siberian-European, Central-Asiatic-European, Central-Asiatic-European-Mediterrancan, Turanic-European, Turanic-EuropeanMediterranean, European-Mediterranean) chorotypes. This darum confirms the well known role, both of connection and separation, that the Alps as a whole played between Europe and the Mediterranean area. Furthermore, it is to be recalled the presence, in some localities of the Eastern Alps, of micro thermophilous, boreal species, like Miscodera arctica, now widespread in Northern regions of the Holarctic Region. Many orophilous, forest-dwelling, riparian and hygrophilolls species, are of northern, north-eastern, ruranic or dinaric-balkanian origin. A very small, bur interesting group of thermophilous elements (mostly Harpalini), originally from the Mediterranean area or temperate steppes, during the hypsothermic periods of the Pleistocene and Olocene, reached the Central and Eastern Alps and Pre-Alps, and persist in xerothermlc biotopes. Some of these could increase their range of distribution as a consequence human activities in agricultural use overgrazing and deforestation. Some others, like Carabus montivagus and Laemostenus algerinus, seem to be present owing to very recent anthropogenic introduction. From the biogeograpic point of view, however the most important group of species is represented by the impressive number of endemics (204, of which 116 species restricted to politic Italy), either eurendemics to Central and Eastern Alps and Pre-Alps, or stenoendemics to single sectors of the area or to very small biotopes (caves, isolated montane massifs): among these, we may cite some large-sized species like Cychrus cylindricollis, endemic at high altitude, to the Central Pre-Alps, several montane, very localized Trechus species, many subterranean, highly specialized Trechini of the peculiar genera Boldoriella, Orotrechus, Anophthalmus, Allegrettia, Italaphaenops, Lessinodytes: many Pterostlchini, and others, Most of them must be considered as pre-Quaternarian elements, With affinltl,es either til Gondwana (such as the blind Reicheina of the genus Alpiodytes), or in the Angarian (as the Broscosoma species) areas, They are, the result of an ancient, subtropical or temperate forest dweller Carabid fauna, tied now to soil: forest littter, superficlal subterranean environment, caves, and upper montane refugia, Both from floristic and faunistic informatlon, It IS a well known fact that the pre-alpine belt as a whole represents a large, unique Pleistocene refugium, that shows a scenario of marked isolation and speciation in mountains, valleys and hypogean compartments. The analysis of the entire Carabid fauna in the Central and Eastern Alps and Pre-Alps shows that the present composition and complexity is the result both of ancient clado-vicariance events and of recellt, ecological factors, These facts surprisingly make this area (not only concerning carabids) very close to important towns and to one of the most populated, cultivated and industrialized area of Italy (the Padanian plain), and in spite of its relatively small surface, one of the most important hot spar of biodiversity in Europe, in which many biotopes are presently highly endangered, or in some cases completely destroyed, A checklist of the Carabid species of the Central and Eastern Alps and Pre-Alps, with their chororypes, is added.
The Invertebrate section of the Museum of Zoology QCAZ at the Pontifical Catholic University of Ecuador in Quito maintains nearly two million curated specimens, and comprises Ecuador's largest collection of native taxa. We review 1902 type specimens from 6 subspecies and 320 species in 121 genera and 42 families, currently kept in the Museum. The list includes 116 holotypes, 10 allotypes, 1774 paratypes and 2 neoparatypes. The collection of type specimens is particularly strong in the Coleoptera (family Carabidae and Staphylinidae) and Hymenoptera. However, other insect orders such as Diptera and Lepidoptera and non-insect arthropods such as Acari, Aranea and Scorpiones, are moderately represented in the collection. This report provides original data from labels of every type specimen record. An analysis of the geographic distribution of type localities showed that collection sites are clustered geographically with most of them found. towards the northern region of Ecuador, in Pichincha, Cotopaxi and Napo provinces. Sites are mainly located in highly accessible areas near highways and towns. Localities with a high number of type species include the cloud forest reserve Bosque Integral Otonga and Parque Nacional Yasunf in the Amazon rainforest near PUCE's Yasuni Scientific Station. Type localities are not well represented in the Ecuadorian National System of Protected Areas. Future fieldwork Sllould include. localities in the southern region of Ecuador but also target less accessible areas not located near highways or towns. We discuss the value of the collection as a source of information for conservation and biodiversity policies in Ecuador.