首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   6611篇
  免费   651篇
  国内免费   264篇
  7526篇
  2024年   28篇
  2023年   95篇
  2022年   146篇
  2021年   238篇
  2020年   351篇
  2019年   436篇
  2018年   308篇
  2017年   220篇
  2016年   244篇
  2015年   286篇
  2014年   356篇
  2013年   510篇
  2012年   269篇
  2011年   321篇
  2010年   301篇
  2009年   315篇
  2008年   325篇
  2007年   281篇
  2006年   286篇
  2005年   259篇
  2004年   226篇
  2003年   183篇
  2002年   182篇
  2001年   138篇
  2000年   104篇
  1999年   136篇
  1998年   118篇
  1997年   97篇
  1996年   65篇
  1995年   79篇
  1994年   72篇
  1993年   54篇
  1992年   65篇
  1991年   51篇
  1990年   45篇
  1989年   32篇
  1988年   34篇
  1987年   30篇
  1986年   29篇
  1985年   37篇
  1984年   30篇
  1983年   18篇
  1982年   26篇
  1981年   15篇
  1980年   18篇
  1979年   17篇
  1978年   8篇
  1976年   10篇
  1975年   6篇
  1974年   8篇
排序方式: 共有7526条查询结果,搜索用时 46 毫秒
11.
Migration and spawning behaviour of eight Atlantic salmon adult females were analysed by radio-tracking in relation to the degree of sexual maturity in a spawning tributary of the R. Sélune. Six of them were grilse and four of them were ripe. All the fish migrated upstream until reaching their spawning site at a distance of 4–12 km from the trap. The daily migration rate up to this site was inversely correlated with the length of the female. Spawning occurred in all fish at the same time when the water temperature increased dramatically. Spawning lasted 1–10 days according to the fish. After spawning, females quickly moved downstream only small distances and then stayed in approximately the same location until death. This study concluded that ripeness did not influence behaviour on the spawning migration and describes certain characteristics of the reproductive phase in a spawning tributary.  相似文献   
12.
Abstract.
  • 1 Seasonal population growth rates for the pea aphid, Acyrthosiphon pisum Harris, were determined in three different host plant habitats; alfalfa, Medicago sativa (L.), clover, Trifolium pratense (L.), and peas, Pisum sativum (L.); over four years and eight places. It was possible to estimate a common intrinsic rate of increase for each host plant habitat.
  • 2 An analysis of the relative influence of temporal, spatial and host plant habitat variation showed that the host plant habitat was most important in determining the growth rates of the populations, both in rate of build-up and decline.
  • 3 Patterns of alate production in the three different habitats differed substantially between the annual peas and the two perennial legumes. During the summer, alate production was large and rapid in peas and remained low and constant in clover and alfalfa
  • 4 Parasitism was highest in peas. The species composition of parasitoids differed between crops.
  • 5 Aphids in annual peas had a higher intrinsic rate of increase and a faster rate of decline than in the two perennial legumes. This explains the presence of both migratory and sedentary forms among pea aphids.
  相似文献   
13.
Natal philopatry in passerine birds: genetic or ecological influences?   总被引:4,自引:1,他引:3  
The degree of natal philopatry (the likelihood that individualsbreed at or near their place of origin) can influence the extentof inbreeding in animal populations. Passerine birds have beencited as typically showing high natal philopatry, and natalphilopatry has been proposed as an adaptation to promote optimalinbreeding. A review of published and unpublished studies ofpasserines showed that natal philopatry was typically low, somaintaining a high level of inbreeding appears relatively unimportantfor such birds. Rather, natal philopatry appeared to be morestrongly influenced by ecological factors. Migratory passerineexhibited low natal philopatry compared to resident passerines,as predicted if dispersal costs for young birds are an importantdeterminant of natal philopatry. The erroneous view that natalphilopatry for passerines is generally high has resulted froma reporting bias toward resident species that have sufficientnatal philopatry to study. Natal philopatry was found to beevolutionarily labile; populations of the same species and pairsof closely related species that differed in their degree ofisolation differed considerably in their degree of philopatry.Future studies of natal philopatry should consider both theecological factors that could affect dispersal costs and thereporting biases that influence which data on philopatry tendto be reported.  相似文献   
14.
Summary The fate of spermatozoa that do not participate in fertilization was investigated by electron microscopy. After artificial insemination, we observed several spermatozoa between the fibers of the outer layer of the vitelline membrane of the ovum. One or more spermatozoa were also found in a phagocytic vesicle of macrophages located in the intercellular space of the mucosal epithelium of the infundibulum or in the outer layer of the vitelline membrane.From these observations, we assume that the superfluous spermatozoa in the lumen of the anterior part of the oviduct might be removed by inclusion into the outer layer of the vitelline membrane and by phagocytosis by macrophages.The authors are greatly indebted to Assoc. Prof. Osamu Koga for his invaluable advice. The authors also wish to thank Mr. Takayuki Mri for his helpful suggestions and technical advice. This investigation was supported by a grant from the Ministry of Education of Japan (156185)  相似文献   
15.
Summary At the end of gastrulation, the lateral mesoderm of amphibian embryos migrates ventrally between the ectoderm and the endoderm. The present study is an examination of the morphology of the leading cells of the mesodermal sheet and of the substratum over which they move (the inner surface of the ectoderm). The cells of the leading edge of the mesoderm are generally round, with very short and narrow flattened projections in the forward direction. These projections do not have a ruffled morphology, regardless of whether fixation is carried out before or after the ectoderm and mesoderm are dissected away from the endoderm. The inner surface of the ectoderm is covered with fine (450–500A) filamentous extracellular material and the ectoderm cells sometimes extend cytoplasmic processes (approx. 0.1 wide) onto the leading surface of the mesoderm or onto adjacent ectoderm cells. These studies indicate that the morphology of cell migration in amphibians is closer to that seen inFundulus than to that characteristic of chick or mammalian cells.This paper is dedicated to the memory of Mac V. Edds, Jr., who warmly encouraged the developmental biologists of the Pioneer Valley  相似文献   
16.
, , , and 1992. A new simplified assay for larval migration inhibition. International Journal for Parasitology 22: 1183–1185. A simple method is described for the in vitro detection of substances that impair the motility of third-stage larvae of gastro-intestinal nematodes. The test is based on the ability of larvae to freely migrate through selected mesh sizes of nylon sieves and the reduced ability of larvae to migrate after preincubation with, and in the presence of, substances that inhibit or reduce larval motility.  相似文献   
17.
18.
Summary A state-dependent model has been used to predict daily and tidal patterns of migration, feeding and inactivity in juvenile plaice (Pleuronectes platessa L.) in their intertidal and shallow subtidal nursery areas. Vertical position, quantity of energy reserves and fullness of the gut characterized the state of individual fishes. If feeding is visually mediated, the model predicts that, by night, plaice should move to areas of low predation risk and become inactive, whereas by day, plaice should migrate to feed in areas of high prey encounter rate. Vertical zones adopted by day and night and, hence, patterns of migration, should depend on the distributions of predators and prey. When prey are more abundant in the intertidal zone, plaice should move onshore to feed as the tide rises and when prey are more abundant offshore, plaice should move offshore to feed by day. If predators are equally abundant in all zones, the fish should behave as if no predators were present, having no effective refuge. An increase in the abundance of predators with depth results in the restriction of plaice activities to shallower vertical zones, depending on the magnitude of the predation threat. Zones adopted thus depend on the trade-off between energy intake and predation risk. Concordance between predicted behaviour and observed patterns is evident in contrasting habitats. Migration and feeding in the Wadden Sea, where prey are more abundant on intertidal flats, is dominated by the tidal component, whereas on impoverished exposed beaches of the west coast of Scotland, the diurnal component is dominant. Tidally related behaviour persists in the latter environment, not predicted by the model and may be a consequence of using endogenous rhythms to approach optimal behavioural patterns.  相似文献   
19.
摘要 目的:探讨血清鸢尾素(Irisin)、氧化三甲胺(TMAO)、巨噬细胞迁移抑制因子(MIF)与慢性心力衰竭(CHF)合并心房颤动(AF)患者预后的关系及其预测价值。方法:选取2020年1月~2023年1月甘肃省人民医院收治的CHF合并AF患者175例纳入合并AF组,根据预后情况分为预后不良组和预后良好组。另选取同期收治未合并AF的CHF患者100例纳入未合并AF组。通过酶联免疫吸附法检测血清Irisin、TMAO、MIF水平。采用多因素Logistic回归分析CHF合并AF患者预后的影响因素,受试者工作特征(ROC)曲线分析血清Irisin、TMAO、MIF对CHF合并AF患者预后不良的预测价值。结果:与未合并AF组比较,合并AF组血清Irisin水平降低,血清TMAO、MIF水平升高(P<0.05)。与预后良好组比较,预后不良组血清Irisin水平降低,血清TMAO、MIF水平升高(P<0.05)。随访6个月,175例CHF合并AF患者预后不良发生率为26.29%。多因素Logistic回归分析显示,纽约心脏病协会(NYHA)心功能分级Ⅲ~Ⅳ级和N末端前体B型钠尿肽(NT-proBNP)、TMAO、MIF升高为CHF合并AF患者预后不良的独立危险因素,Irisin升高为独立保护因素(P<0.05)。ROC曲线分析显示,血清Irisin、TMAO、MIF联合预测CHF合并AF患者预后不良的曲线下面积(AUC)为0.919,大于血清Irisin、TMAO、MIF单独预测的0.787、0.780、0.777。结论:CHF合并AF患者血清Irisin水平降低,TMAO、MIF水平升高,且与预后不良密切相关。血清Irisin、TMAO、MIF水平联合检测对CHF合并AF患者预后不良具有较高的预测价值。  相似文献   
20.
Phagocytosis by neutrophils, macrophages, and other professional phagocytes requires rapid remodeling of actin. Early phagosomes are surrounded by a rim of F-actin that is disassembled during phagosomoal maturation. Breakdown of periphagosomal F-actin and phagolysosome fusion are calcium dependent processes in neutrophils interacting with serum-opsonized prey, but appears to be calcium independent in macrophages interacting with serum- or IgG-opsonized prey. In the present study, we found that calcium was necessary for phagocytosis, breakdown of periphagosomal F-actin, and phagosomal maturation in J774 macrophages interacting with unopsonized prey. We also observed that lipophosphoglycan (LPG) from Leishmania donovani promastigotes required calcium to exert its inhibitory effect on macrophage phagocytosis and periphagosomal F-actin breakdown. We conclude that calcium is essential for phagocytosis, depolymerization of periphagosomal F-actin, and phagosomal maturation in J774 macrophages interacting with unopsonized prey, as well as for proper functioning of LPG.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号