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21.
Methanobacterium thermoaggregans is a new thermophilic autotrophic rod-shaped methane producing bacterium. The organism likes to form aggregates during growth and utilizes only H2 and CO2 as substrates. Growth optimum is at 65°C with a doubling time of 3.5 h. Optimal growth occurs at pH-values between 7 and 7.5. The addition of yeast extract to the mineral salt medium stimulates growth. The DNA base composition is 42 mol% G+C. The organism was isolated from mud taken from a cattle pasture. Because of its optimal growth temperature and its tendency to form aggregates the nameMethanobacterium thermoaggregans is suggested.Abbreviations G+C
Guanine+cytosine 相似文献
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Summary In this study the fine structure of the cerebral ganglion of Sagitta setosa (Chaetognatha) is investigated. The ganglion is flat and superficially positioned dorsally, below the basal lamina of the cephalic epidermis. It is surrounded by a specifically differentiated sheath. This sheath is made up of cells, which are interpreted as representing glial cells, and can be divided into an outer and an inner zone. The outer zone is composed of flat sheath cells with pale nuclei and few organelles. The inner zone consists of densely packed, extremely thin lamellar cellular processes. These attenuated lamellae, which still contain cytoplasm, resemble the myelin sheath of vertebrate axons. The intercellular space between the lamellae contains electron-dense material. In the sheath specialized intercellular contacts occur. The inner zone of this sheath extends at definite points into the centre of the ganglion and separates a zone of perikarya from the neuropil, as well as the single perikarya from each other. The perikarya are relatively uniform and do not form a cortex, but are concentrated mainly in lateral parts of the cerebral ganglion. Within the neuropil are axonal endings which have synaptic contacts with several postsynaptic elements. These anatomical findings are discussed with respect to their functional significance. 相似文献
24.
Thermal influences on the habitat preference and the diurnal activity in three European Rana species
Ulrich Sinsch 《Oecologia》1984,64(1):125-131
The diurnal behaviour of frogs was recorded quantitatively in a habitatlike experimental environment by a new method of automatic registration via thermocouples. Three species with different habitat preferences during their summer activity period were chosen: the terrestrial common frog Rana temporaria LINNÈ and the semiaquatic water frog Rana lessonae CAMERANO and Rana ridibunda PALLAS. The activity, the location and the skin temperatures of these frogs were recorded continuously in four different temperature ranges (8.1° C–31.0° C) within the temperature span of the summer activity period. The thermal requirements and behavioural adaptations to the habitat of each species were analysed. The experimental results coincided with field observations and showed some details not yet known. The northern species R. temporaria exhibited a distinctive behavioural thermoregulation including cooling behaviour at high temperatures and warming behaviour at low temperatures during the day. In all temperatures tested these frogs remained on land changing their preferred location from the open area to the hiding places. The main activity period shifted from night to day with decreasing temperatures. The more southern species R. lessonae preferred higher temperatures than the other species showing basking behaviour during the day independent of the ambient temperature. With decreasing temperatures the preferred location changed from the shore to the water and the activity during the night almost disappeared. The closely related R. ridibunda tolerated high temperatures too, but only rarely basked. This species, however, reacted contrarily to decreasing temperatures: it changed its preference from the water to the land. This behavioural differenciation between the water frog species may be of importance for the actual habitat preference of these central european water frogs. 相似文献
25.
Klaus-Ulrich Thiedemann Pramote Vanittanakom Frank-Michael Schweers Prof. Dr. med. Ulrich Drews 《Cell and tissue research》1986,244(1):153-164
Summary In the genital tract of male and female mouse embryos cholinesterase activity is described that is independent from innervation. The enzyme activity is localized in the mesenchyme at the junction of Wolffian and Müllerian ducts with the urogenital sinus. During male development prostate buds and vesicular glands grow out into the cholinesterase-active mesenchyme. During female development the active mesenchyme participates in the downgrowth of the vaginal anlage. Ultrastructurally the cholinesterase activity is localized in the perinuclear cisterna and in smooth endoplasmic reticulum of the mesenchymal cells. The enzyme activity disappears with definitive differentiation of the tissue. The embryonic cholinesterase is a component of a primitive muscarinic system. Its relation to the morphogenetic action of testosterone and its possible general functions are discussed. 相似文献
26.
A pseudomonotide pelecypod-Pachypteria sinaitica n. sp. - is described from Abu Durba Formation (Visé) of southwest Sinai. The new species forms a link with rather similar populations in the Lower Carboniferous of Marocco. Like the oysters, but byssate and cemented with its right valve,P. sinaitica n. sp. built up small limestone beds within a marginal marine environment of sedimentation. As regards the isotopie composition, the carbonates of the shell were secreted in a water of approximately 25° C.It follows, that the littoral waters of the southern Tethys were warmer during the Lower Carboniferous than those of present Red Sea. 相似文献
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28.
Imino proton assignments in the proton nuclear magnetic resonance spectrum of the lambda phage OR3 deoxyribonucleic acid fragment 总被引:4,自引:0,他引:4
E L Ulrich E M John G R Gough M J Brunden P T Gilham W M Westler J L Markley 《Biochemistry》1983,22(19):4362-4365
The 17 base pair duplex d(TATCACCGCAAGGGATAp) . d(TATCCCTTGCGGTGATAp) corresponding to the OR3 operator site of lambda phage has been synthesized and studied by 1H nuclear magnetic resonance spectroscopy at 470 MHz. The 13 imino proton resonances observed at 20 degrees C have been assigned to specific base pairs at positions 3-15 on the basis of nuclear Overhauser effect measurements and studies of the temperature dependence of peak intensities. Resonances from the A-T base pairs at positions 1, 2, 16, and 17 are assumed to be absent from the spectrum because of terminal fraying. Resonance from many of the base pairs suggested by Ohlendorf et al. [Ohlendorf, D. H., Anderson, W. F., Fisher, R. G., Takeda, Y., & Matthews, B. W. (1982) Nature (London) 298, 718-723] to be involved in specific binding of the lambda phage cro repressor are well resolved. 相似文献
29.
30.
Chromosomen-Aktivität und biochemische Zelldifferenzierung in den Speicheldrüsen von Camptochironomus 总被引:3,自引:3,他引:0
Ulrich Grossbach 《Chromosoma》1969,28(2):136-187
Salivary glands of Camptochironomus tentans and C. pallidivittatus were used to study the question whether genes controlling the synthesis of characteristic cell proteins are located in chromomeres specifically puffed in this tissue. Salivary gland cells produce considerable amounts of secretory proteins. In G. tentans, this secretion was shown by gel electrophoresis to consist essentially of 5 protein subunits. In C. pallidivittatus, a component (no. 6) additional to these was found. Another constituent of the secretion (no. 7) is synthesized in C. pallidivittatus by only a small group of gland cells. — The inheritance of these species- and cellspecific proteins has been investigated by relating their presence in interspecific hybrids to the chromosome constitution. Fraction no. 6 was found to be correlated to a short distal region of chromosome IV in which a tissue-specific Balbiani ring is located. Secretion component no. 7 which is characteristic of the special gland lobe of C. pallidivittatus is also controlled by chromosome IV which in this lobe develops a cell-specific Balbiani ring.
Herrn Professor Dr. W. Beermann bin ich für die Anregung zu dieser Arbeit, sein stetes, förderndes Interesse und die Überlassung aller Arbeitsmöglichkeiten zu großem Dank verpflichtet. Ferner möchte ich Herrn E. Freiberg für das verständnisvolle Ausführen der Zeichnungen und Herrn Peinmechanikermeister H. Braun für seine vielfältige Hilfe herzlich danken. 相似文献
Herrn Professor Dr. W. Beermann bin ich für die Anregung zu dieser Arbeit, sein stetes, förderndes Interesse und die Überlassung aller Arbeitsmöglichkeiten zu großem Dank verpflichtet. Ferner möchte ich Herrn E. Freiberg für das verständnisvolle Ausführen der Zeichnungen und Herrn Peinmechanikermeister H. Braun für seine vielfältige Hilfe herzlich danken. 相似文献