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排序方式: 共有139条查询结果,搜索用时 15 毫秒
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To maintain genomic stability, chromosome architecture needs to be tightly regulated as chromosomes undergo condensation during prophase and separation during anaphase, but the mechanisms remain poorly understood. Here, we show that the Plk1-binding protein PICH and Plk1 kinase coordinately maintain chromosome architecture during prometaphase. PICH knockdown results in a loss of Plk1 from the chromosome arm and an increase in highly disorganized “wavy” chromosomes that exhibit an “open” or “X-shaped” configuration, consistent with a loss of chromosome arm cohesion. Such chromosome disorganization occurs with essentially no change in the localization of condensin or cohesin on chromosomes. Interestingly, the chromosome disorganization could be prevented by treatment with a topoisomerase II inhibitor ICRF-193, suggesting that the PICH–Plk1 complex normally maintains chromosome architecture in a manner that involves topoisomerase II activity. PICH knockdown does not affect initial chromosome compaction at prophase but causes anaphase DNA bridge formation and failed abscission. Our studies suggest that the PICH–Plk1 complex plays a critical role in maintaining prometaphase chromosome architecture. 相似文献
84.
目的评价硫糖铝在胃内对H.pyloriVacA IgY型抗体的保护作用,为制备H.pyloriVacA IgY型抗体口服剂提供实验依据。方法大量诱导工程菌DH5α-vacA-pQE30,表达并纯化重组蛋白VacA。以VacA为抗原接种洛曼母鸡,制备纯化的IgY。建立H.pylori感染的小鼠模型,在不同浓度的IgY液中分别加入30%硫糖铝,灌胃后观察胃黏膜慢性炎症反应以评价硫糖铝在胃内对VacA IgY的保护作用。结果在小鼠胃内,0.5mg IgY+30%硫糖铝/天灌胃小鼠即可有效防治H.pylori感染引起的胃黏膜损害,与不加硫糖铝比较,其效果提高了8倍。结论 30%以上的硫糖铝在小鼠胃内可增强VacA IgY对低pH和胃蛋白酶的耐受能力,是较理想的抗H.pyloriVacA IgY型抗体保护剂。 相似文献
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Kim YL Im YJ Lee YK Ha NC Bae YS Lim SM Okajima F Im DS 《Biochemical and biophysical research communications》2006,351(4):953-957
Jurkat T cells were found to adhere to a tissue culture flask or cover glass when 10% fetal bovine serum (FBS) was withdrawn. However, the cells adhered to extracellular matrix, especially fibronectin, regardless of the presence of FBS. We hypothesized that a substance in FBS inhibits T cells' adherence. Through a purification and identification procedure performed on the substance, bovine serum albumin (BSA) was found to inhibit T cell adhesion. BSA, furthermore, inhibited the adhesion of human primary cultured T cells. These results suggest a novel function for albumin as a T cell adhesion inhibitor. 相似文献
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Sexual behavior between males and females, as well as between males, is described and discussed for the cerambycid beetlePhytoecia rufiventris. The beetles' taxis toward plants taller than average height brings the sexes together from a distance. A male may mount another individual (male or female) and attempt copulation without sex discrimination. The male can discern the sex of another individual only when the terminal part of his abdomen touches the ventral surface of the fifth visible sternite of the latter. No evidence of a sex pheromone is found in this species. Within 1.5–5.5 cm the substrateborne vibrations produced by a moving individual may be the important factor which elicits males to approach a moving individual and attempt copulation. If a female is receptive when a male touches her, he can copulate with her without any courtship display. However, if the female runs away and appears unreceptive, the male will perform courtship displays. Copulation is usually terminated by males. Homosexual behavior between males is discussed. 相似文献
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Jian-feng Ji Sheng-jun JiRui Sun Kun LiYuan Zhang Li-yuan ZhangYe Tian 《Biochemical and biophysical research communications》2014
Cranial radiotherapy induces progressive and debilitating cognitive deficits, particularly in long-term cancer survivors, which may in part be caused by the reduction of hippocampal neurogenesis. Previous studies suggested that voluntary exercise can reduce the cognitive impairment caused by radiation therapy. However, there is no study on the effect of forced wheel exercise and little is known about the molecular mechanisms mediating the effect of exercise. In the present study, we investigated whether the forced running exercise after irradiation had the protective effects of the radiation-induced cognitive impairment. Sixty-four Male Sprague–Dawley rats received a single dose of 20 Gy or sham whole-brain irradiation (WBI), behavioral test was evaluated using open field test and Morris water maze at 2 months after irradiation. Half of the rats accepted a 3-week forced running exercise before the behavior detection. Immunofluorescence was used to evaluate the changes in hippocampal neurogenesis and Western blotting was used to assess changes in the levels of mature brain-derived neurotrophic factor (BDNF), phosphorylated tyrosine receptor kinase B (TrkB) receptor, protein kinase B (Akt), extracellular signal-regulated kinase (ERK), calcium-calmodulin dependent kinase (CaMKII), cAMP-calcium response element binding protein (CREB) in the BDNF–pCREB signaling. We found forced running exercise significantly prevented radiation-induced cognitive deficits, ameliorated the impairment of hippocampal neurogenesis and attenuated the down-regulation of these proteins. Moreover, exercise also increased behavioral performance, hippocampal neurogenesis and elevated BDNF–pCREB signaling in non-irradiation group. These results suggest that forced running exercise offers a potentially effective treatment for radiation-induced cognitive deficits. 相似文献
90.
Li-yuan Chai Yue-hui Chen Chong-jian Tang Zhi-hui Yang Yu Zheng Yan Shi 《Applied microbiology and biotechnology》2014,98(4):1907-1912
There is no commercial or industrial-scale process for the remediation of black liquor using microorganisms to date. One of the most important causes is that most microorganisms are not able to use lignin as their principal metabolic carbon or energy source. The bacterial strain Comamonas sp. B-9 has shown remarkable ability to degrade kraft lignin and decolorize black liquor using lignin as its principal metabolic carbon and energy source. This report looks at the depolymerization and decolorization of kraft lignin by Comamonas sp. B-9. The degradation, decolorization, and total carbon removal reached 45, 54, and 47.3 %, respectively, after 7 days treatment. Comamonas sp. B-9 was capable of depolymerizing kraft lignin effectively as analyzed by gel permeation chromatography and decolorization via degrading benzene ring structures as shown using Fourier transform infrared spectroscopy analysis. 相似文献