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   14566篇
  免费   980篇
  国内免费   2150篇
  17696篇
  2024年   48篇
  2023年   277篇
  2022年   375篇
  2021年   480篇
  2020年   451篇
  2019年   574篇
  2018年   529篇
  2017年   476篇
  2016年   496篇
  2015年   555篇
  2014年   778篇
  2013年   989篇
  2012年   620篇
  2011年   731篇
  2010年   541篇
  2009年   804篇
  2008年   810篇
  2007年   769篇
  2006年   697篇
  2005年   709篇
  2004年   628篇
  2003年   563篇
  2002年   481篇
  2001年   380篇
  2000年   356篇
  1999年   321篇
  1998年   316篇
  1997年   231篇
  1996年   270篇
  1995年   248篇
  1994年   229篇
  1993年   194篇
  1992年   180篇
  1991年   185篇
  1990年   159篇
  1989年   120篇
  1988年   91篇
  1987年   90篇
  1986年   94篇
  1985年   125篇
  1984年   105篇
  1983年   72篇
  1982年   107篇
  1981年   92篇
  1980年   64篇
  1979年   55篇
  1978年   34篇
  1977年   34篇
  1976年   28篇
  1973年   37篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
The linkage of the Phi, Pgd, Po2, S, H and halothane sensitivity loci was followed in a Belgian Landrace family, heterozygous for these systems over 6 generations. Recombination next to the S locus occurred mainly in pigs belonging to this particular family. From this investigation the position of the S locus is proved to be outwith the Phi-Pgd region, next to Phi . Therefore the gene sequence S - Phi - Hal -H- Po2 -Pgd is proposed. Higher recombination rates were observed in the female parental line of the multiheterozygous family when compared to the male parental line. Additional data from animals, unrelated to this strain, confirm the evidence of close linkage of the S system to the nearest marker loci.  相似文献   
2.
Summary It has been suggested that the immune system might figure prominently in the regulation of forelimb regeneration. However, neither the nature of this influence nor the aspect(s) of regeneration influenced are clearly known. The determination of which components of the immune system are indispensable for regeneration would be a logical first step in attempting to address such questions. This investigation, therefore, examined the effects of removing the spleen, a major lymphoid organ in the newt, upon the progress of regeneration. Splenectomies performed concomitantly with or after forelimb amputation failed to alter the time course of regeneration. Splenectomies, but not sham-splenectomies, performed prior to amputation reduced the time required to achieve successive stages of regeneration under some, but not all conditions, i.e., when performed 10–20 days before amputation, during the late fall and winter. Up until 35 days after amputation, no gross morphological distortions were observed as a result of splenectomy. It was concluded that the spleen is not required for regeneration to occur.Portions of this work constitute part of the thesis submitted by M.E. Fini in partial fulfillment of the requirements for the M.S. degree in Biology at Boston College  相似文献   
3.
4.
We have compared the species richness of medicinal plants and the differential patterns of use amongst settlements in the Andean communities of Northwest Argentina which have differing levels of isolation. About 259 ethnoespecies, belonging to 74 plant families, were included, representing between 70 and 80% of the total estimate. The results indicate that Coronopus didymus is the most relevant and important species. The method of use of medicinal plants and the ailments treated by rural doctors compared to those of the layperson is different. Native and exotic plants are used differently according to the body system treated. There are some relationships between internal and external use and body systems and recipes. The greater medicinal species richness found in the less isolated locations is due to external enriching cultural influences.  相似文献   
5.
This paper presents methods for the stereological analysis of spatial fibre systems on the base of planar or thin sections. Under the assumption that the cross-section figures of the tubular fibres can be measured, the orientation distribution of the fibre system and its line density Lv can be determined from one section only and without distributional assumptions. A simple way to study the degree of randomness of fibre systems consists in the statistical analysis of the point pattern of centres of intersection figures. More sophisticated methods are of stereological nature and yield the spatial reduced second moment measure. Similarly also correlations between two fibre systems can be quantified. The methods are demonstrated by two examples concerning samples of human brain.  相似文献   
6.
The rewardless orchid Dactylorhiza sambucina shows a stable flower colour polymorphism, with both yellow- and red-flowered morphs growing sympatrically. Pollination biology and breeding system were investigated to examine the effects of density of plants, colour polymorphism, inflorescence dimension, and flower position within inflorescence on male and female reproductive success in three natural populations of D. sambucina. There were significant differences among sites in the number of pollinia removed and in fruit set per inflorescence. Number of removed pollinia and capsule production in D. sambucina were independent from flower and inflorescence size or flower position. As a whole, the red morphs showed the highest number of capsules produced, while the yellow morphs had the greatest male success. The relative male and female reproductive success were independent from plant density but were significantly correlated with the yellow morph frequency at the population level. Overall, our findings show that the contribution to the total reproductive success deriving from the two colour morphs does not conform with the predictions of negative frequency-dependent selection.  相似文献   
7.
8.
《Cell reports》2020,30(5):1373-1384.e4
  1. Download : Download high-res image (144KB)
  2. Download : Download full-size image
  相似文献   
9.
10.
目的 调查上海市实行医疗保险总额预付的三级医院中患者的就医感受。方法 经培训的调查员应用结构式调查问卷对上海市10家实行医疗保险总额预付的三级医院的699名患者进行面对面访谈,数据分析主要采用描述性统计。结果 城保患者对门诊医生明显减少处方金额(或处方天数)的感受强于非城保患者,城保和非城保患者的住院就医感受差异无显著统计学意义。结论 医疗保险总额预付对上海三级医院患者就医感受的总体效应似偏弱,而且有限的影响主要集中于门诊而非住院环节。  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