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101.
Background
The impressive increase of novel RNA structures, during the past few years, demands automated methods for structure comparison. While many algorithms handle only small motifs, few techniques, developed in recent years, (ARTS, DIAL, SARA, SARSA, and LaJolla) are available for the structural comparison of large and intact RNA molecules. 相似文献102.
103.
Fluorescence depolarization experiments performed on labaled poly-L -proline Forme II suggest the occurrence of aggrgation in water while 6M guanidinium-HCl induces dissociation. The solvent 4M CaCl2 results in a reduction of polymer structural orgganization. These findings corroborate suggestion of polyproline aggregation and solution behavior in aqueous neutral salt solytion (see preceding article). 相似文献
104.
J A Willis W F Williams T Schleich 《Biochemical and biophysical research communications》1986,138(3):1068-1073
A proton nuclear magnetic resonance technique is demonstrated for ascertaining the real-time contribution of the hexose monophosphate shunt to glucose metabolism in the intact incubated rabbit lens. This measurement requires incubation of the tissue in medium supplemented with [1-13C]glucose, and depends on the presence of the 13C label in the methyl position of lactate which creates satellite resonances by way of 13C - 1H spin-spin scalar coupling. The assumptions required to make the measurement are presented. For lenses maintained under control conditions, a basal level corresponding to 5% hexose monophosphate shunt activity was determined. An eight-fold increase in activity was observed under conditions known to stimulate the shunt. 相似文献
105.
We analysed the physical structure and functional interpretation of juvenile vocalizations ofCtenomys talarum Thomas, 1898. Two sounds, one true vocalization (care-elicitation call) and one mechanical sound (nursing sound) were recorded
during the nestling period. Care-elicitation calls were emitted by isolated pups and caused the mother to respond by immediately
approaching the pups to take care of them. This maternal response to the care-elicitation calls ofC. talarum pups, together with the production of these vocalizations during the first weeks after birth, when pups depend exclusively
on their mother to obtain food and maintain their body temperature, give preliminary support for the recent theory that care-elicitation
cries are honest advertisements of offspring need. 相似文献
106.
Fritz Gessner Zusammenarbeit mit Herrn Dipl.-Ing. Fritz Schleich Gertrud Volz 《Planta》1951,39(2):171-174
Ohne ZusammenfassungMit 3 Textabbildungen. 相似文献
107.
Valentina Brachetta Cristian E. Schleich Roxana R. Zenuto 《Ethology : formerly Zeitschrift fur Tierpsychologie》2014,120(6):563-576
Spatial learning, the cognitive ability that allows animals to efficiently locate food, partners or avoid predators, can be affected by various factors such as stress. Stressors represent a threat to the animal's homeostasis and trigger a set of physiological and behavioral changes known as stress response. The herbivorous rodent Ctenomys talarum (tuco‐tuco) inhabits underground complex gallery systems. Dispersal as well as food collection occurs on the surface, where they are exposed to terrestrial and aerial predators. We evaluated the effect of a natural stress factor, predation, on spatial learning of C. talarum. Additionally, we collected data on neutrophil/lymphocyte ratio, hematocrit, blood glucose, and plasma cortisol to assess physiological levels of stress. The acute exposure to direct cues indicating the presence of a predator (immobilization + cat urine) increased the time needed to reach the goal in a longitudinal labyrinth. The number of errors also increased albeit the difference was only marginally significant. The chronic exposure to predator cues (immobilization, cat urine, and cat fur) presented in an unpredictable order significantly increased both time and errors committed by tuco‐tucos during learning trials in the labyrinth. Results show the strong impact of predatory stress on the spatial abilities of C. talarum, a key cognitive process involved in most of their vital activities. They also highlight the importance of investigating wild species as regards the development of antipredatory defensive behaviors that contribute both to the avoidance of deleterious consequences of a direct attack and the influence on food search and mate localization performance. 相似文献
108.
109.
Marina Kolesnichenko Nadine Mikuda Uta E Hpken Eva Krgel Bora Uyar Ahmet Bugra Tufan Maja Milanovic Wei Sun Inge Krahn Kolja Schleich Linda von Hoff Michael Hinz Michael Willenbrock Sabine Jungmann Altuna Akalin Soyoung Lee Ruth SchmidtUllrich Clemens A Schmitt Claus Scheidereit 《The EMBO journal》2021,40(6)
110.
H. H. Schleich W. Kästle M. -Cl. Groessens-van Dyck 《Pal?ontologische Zeitschrift》1988,62(1-2):133-146
From Paleocene deposits from Belgium fossil egg shells of turtles are reported. A systematically not interpretable form(Testudinarum ovum) is described, together withHaininchelys curiosa n. g. n. sp. as a new genus organus for fossil eggs. Egg shells from Dinosauna, Aves, Testudines, Crocodylia and Squamata are discussed for comparison. 相似文献