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排序方式: 共有408条查询结果,搜索用时 375 毫秒
1.
Size selection of latex beads by blackfly larvae (Diptera: Simuliidae) in the laboratory 总被引:1,自引:1,他引:0
P. Schröder 《Hydrobiologia》1987,144(2):163-171
In laboratory experiments, blackfly larvae collected from a lake outlet, a woodland and a meadow stream were tested for size
selection of latex beads of < Ito > 100 μm diameters. 3 suspensions of varying proportions for each size category were supplied
to these blackfly larvae in common experiments. Comparisons between the size frequency distributions of particles supplied
and the particle compositions in the larval guts showed intra- and interspecific differences and were quantified by calculating
Jacobs' electivity index. In all species selection of larger particles increased with the larger larval instars. Although
there was a positive selectivity of small particles in some cases, the ingested proportion of large particles increases volumes
and biomasses of gut content and may be more important for larval growth than small particles. 相似文献
2.
本文选择两种溶剂体系,用两次单向薄层层析,从小麦抗寒与不抗寒品系天然橡胶胶乳分离提纯出6种单半乳糖和双半乳糖双甘油酯。并比较了它们的疏水侧链的脂肪酸组成。小麦糖脂疏水侧链脂肪酸的不饱和指数远大于天然胶乳糖脂。抗寒品系胶乳糖脂疏水侧链脂肪酸不饱和指数大于不抗寒品系。双半乳糖双甘油酯疏水侧链脂肪酸不饱和指数均大于其单半乳糖糖脂。 相似文献
3.
A small group of chimpanzees was allowed to manipulate different quantities of novel objects in order to enhance their captive conditions. This procedure led to a general increase in the manipulation frequency by the apes. It decreased their inactivity and their self-grooming, and almost eliminated the abnormal behaviors displayed by one individual. The distribution of novel objects did not affect the total frequency of social interactions and did not increase the aggressivity of the animals, even though dominant individuals secured most of the objects when only a small number of them were available. Following their familiarization with the novel objects, the chimpanzees' manipulation frequency decreased whereas self-grooming and abnormal behaviors were increased. Suggestions are made on how to maximize the use of a limited bank of toys to occupy captive chimpanzees. 相似文献
4.
Summary Cellular distribution of insulin receptors was studied in fractionated rat liver cell suspensions using 1251-insulin and a visual probe consisting of latex beads covalently linked to insulin (minibeads). Fractionation was done on metrizamide gradients which yielded two cellular fractions. The large cell fraction consisted mostly of hepatocytes and the small cell fraction consisted of 37% endothelial cells as well as Kupffer cells. The magnitude of insulin uptake by the endothelium-rich small cell fraction was at least double that of the uptake by the hepatocyte-rich fraction. The minibead technique demonstrated that in the small cell fraction only endothelial cells, and not Kupffer cells, were responsible for the insulin uptake. Our findings suggest that liver endothelium may be responsible for the uptake of circulating insulin and its transport to hepatocyte. This emphasizes the presence of a tissue-blood barrier in the liver.Abbreviations PRS
phosphate-buffered saline
- SEM
scanning electron microscopy
- TEM
transmission electron microscopy 相似文献
5.
将盘菌纲系统学研究继续下去的两个优先考虑的问题是:必须将传统的α-分类方法与广泛的标本采集工作相结合,尤其是在世界上很少采集的地区;同时,研究盘菌和地衣化子囊菌之间的相互关系,并注意各个目与科之间的可能联系。新白水盘菌(Leucovibrissea)是从组的等级上升为属的,它与另外两个属共同组成了锤舌菌目的新科水盘菌科(Vibrisseaceae)。本文还讨论了某些类群的系统学研究现状,并提出了一些目前没有答案但看来是基础的生物学问题。 相似文献
6.
江苏野菜资源的利用与开发 总被引:17,自引:0,他引:17
江苏野菜资源丰富,共计192种,隶属44科108属,其中蕨类植物7科15属51种,种子植物37科93属141种。江苏野菜利用历史悠久,近年已发展成为规模种植,产生良好的经济效益和社会效益。 相似文献
7.
Affinity tag AG consisting of immunoglobulin G (lgG)-binding domains of protein A from Staphylococcus aureus (EDABC) and those of protein G from Streptococcus strain G148 (C2C3) were used to facilitate immobilization of beta-galactosidase (betagal) from Escherichia coli. Poly(methylmethacrylate/N-isopropylacrylamide/methacrylic acid) [P(MMA/NIPAM/MAA)] and poly(styrene/N-isopropylacrylamide/methacrylic acid) [P(St/NIPAM/MAA)] latex particles, which show thermosensitivity, were used as support materals to prepare affinity adsorbents. Human gamma-globulin (HgammaGb), whose major fraction is lgG, was used as an affinity ligand and was covalently immobilized onto the both latex particles by the carbodiimide method under various conditions. A fusion protein, AGbetagal, was immobilized at pH 7.3 by the specific binding of affinity tag to these affinity adsorbents. The amount of adsorbed AGbetagal per unit amount of immobilized HgammaGb, namely, efficiency of ligand utilization, was strongly affected by the type of latex particles and pH value for HgammaGb immobilization. The efficiency of ligand utilization was maximum in the affinity adsorbents prepared at pH 6.0 to 7.0, and that in the HgammaGb-P(MMA/NIPAM/MAA) latex particles was high. This result could be explained by the conformation and orientation of immobilized HgammaGb molecules. Immobilized AGbetagal retained approximately 75% of its activity in solution and the binding is stable enough to allow repeated use. These results clearly demonstrate that combination of the affinity tag AG and the affinity adsorbents, based on the thermosensitive latex particles, offers a simple and widely applicable method for preparation of immobilized enzyme with high activity. (c) 1995 John Wiley & Sons, Inc. 相似文献
8.
A series of unstable mono- and di-esters of the tetracyclic diterpene ingenol were isolated from the pro-inflammatory ether-soluble fraction of the latex of Euphorbia kamerunica. The esters were isolated by a neutral process involving column and thin-layer chromatography. The monoesters were identified by spectroscopic methods and hydrolysis reactions as ingenol-3-decanoate, ingenol-3-dodecanoate, ingenol-5-hexadienoate and ingenol-5-octenoate and the diesters as 20-acetyl-ingenol-3-octenoate and 20-acetyl-ingenol-3-angelate. 相似文献
9.
Henry Hurd Rusby (1855–1940) is one of the outstanding personalities in the history of the New York Botanical Garden (NYBG).
He played a significant role, not only in the founding of NYBG in 1891, but also in establishing a strong precedent of research
and exploration in the field of economic botany at the new institution. As a result of Rusby’s influence and activity, the
study of useful plants formed an important part of NYBG’s original mandate, an institutional commitment that was rejuvenated
nearly a century later, with the formation of the Institute of Economic Botany. An indefatigable researcher both in the field
and in the herbarium, Rusby left behind a voluminous corpus of published work in systematic and economic botany that is a
legacy for modern botanists and pharmacologists. 相似文献
10.
S. A. BARNETT RHONDDA G. DICKSON KATHY G. WARTH 《Zoological Journal of the Linnean Society》1980,70(4):421-430
Scent marking by deposition of urine, and the preputial glands, of adult, male, wild house mice, Mus mmmlus L., were studied and compared with those of an outbred domestic strain. The preputial glands of dominant wild mice were always heavier than those of subordinates. No dominance relationships could be established among the domestic mice. For study of scent marking each mouse was observed singly in a residential maze. Dominant wild mice marked more than the subordinates. The domestic mice scent-marked much less even than the subordinate wild mice. Subordinate wild mice spent less time than the dominant wild mice outside the nest; but the number of excursions outside the nest made by the subordinates resembled that of the dominants. Hence social status influenced the pattern of movements in a structured environment. 相似文献