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   5220篇
  免费   335篇
  国内免费   193篇
  2023年   64篇
  2022年   61篇
  2021年   110篇
  2020年   128篇
  2019年   143篇
  2018年   164篇
  2017年   148篇
  2016年   144篇
  2015年   191篇
  2014年   469篇
  2013年   690篇
  2012年   332篇
  2011年   201篇
  2010年   177篇
  2009年   241篇
  2008年   241篇
  2007年   239篇
  2006年   189篇
  2005年   194篇
  2004年   148篇
  2003年   150篇
  2002年   109篇
  2001年   83篇
  2000年   67篇
  1999年   43篇
  1998年   69篇
  1997年   45篇
  1996年   47篇
  1995年   42篇
  1994年   46篇
  1993年   48篇
  1992年   65篇
  1991年   34篇
  1990年   42篇
  1989年   35篇
  1988年   35篇
  1987年   30篇
  1986年   46篇
  1985年   84篇
  1984年   48篇
  1983年   52篇
  1982年   51篇
  1981年   39篇
  1980年   44篇
  1979年   32篇
  1978年   16篇
  1977年   15篇
  1976年   14篇
  1975年   10篇
  1973年   10篇
排序方式: 共有5748条查询结果,搜索用时 484 毫秒
1.
《Ethnic and racial studies》2012,35(8):1427-1446
Abstract

The national census is often seen as a site of struggle for minorities seeking recognition and equality. Much less is known about the conditions under which ethnic majorities are galvanized to stake identity claims in the census. This article examines recent trends in New Zealand where an increasing number of people from the dominant New Zealand European group are redefining themselves as ethnic New Zealanders. Drawing from the literature on ethnic boundaries, we theorize the factors underlying the surge in New Zealander identification, and present census data to demonstrate its selective appeal. We also review patterns of national naming in North America and Australia to show that the New Zealander phenomenon reflects a broader shift by settler state majorities to reimagine their identities. The implications for ethnic counting in other contexts are briefly considered.  相似文献   
2.
Many studies have examined the association between the FABP2 (rs1799883) Ala54Thr gene polymorphism and type 2 diabetes mellitus risk (T2DM) in various populations, but their results have been inconsistent. To assess this relationship more precisely, A HuGE review and meta‐analysis were performed. The PubMed and CNKI database was searched for case‐control studies published up to April 2014. Data were extracted and pooled odds ratios (OR) with 95% confidence intervals (CI) were calculated. Ultimately, 13 studies, comprising 2020 T2DM cases and 2910 controls were included. Overall, for the Thr carriers (Ala/Thr and Thr/Thr) versus the wild‐type homozygotes (Ala/Ala), the pooled OR was 1.18 (95% CI = 1.04–1.34, P = 0.062 for heterogeneity), for Thr/Thr versus Ala/Ala the pooled OR was 1.17 (95% CI = 1.05–1.41 P = 0.087 for heterogeneity). In the stratified analysis by ethnicity, the significantly risks were found among Asians but not Caucasians. This meta‐analysis suggests that the FABP2 (rs1799883) Ala54Thr polymorphisms are associated with increased susceptibility to T2DM risk among Asians but not Caucasians.  相似文献   
3.
4.
Nucleotide sequence of the ethidium efflux gene from Escherichia coli   总被引:4,自引:0,他引:4  
The nucleotide sequence of the gene specifying the ethidium efflux system of Escherichia coli has been determined. The translated open reading frame has identified a membrane-bound polypeptide of 110 amino acids (11,960 Da) which shares 42% identity with a staphylococcal protein specifying resistance to ethidium.  相似文献   
5.
6.
7.
A CII-responsive promoter within the Q gene of bacteriophage lambda   总被引:2,自引:0,他引:2  
F H Stephenson 《Gene》1985,35(3):313-320
  相似文献   
8.
9.
《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   
10.
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