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   1832943篇
  免费   141561篇
  国内免费   3773篇
耳鼻咽喉   24380篇
儿科学   60254篇
妇产科学   51953篇
基础医学   271823篇
口腔科学   50166篇
临床医学   163857篇
内科学   357619篇
皮肤病学   43011篇
神经病学   145585篇
特种医学   68871篇
外国民族医学   523篇
外科学   274584篇
综合类   39750篇
现状与发展   3篇
一般理论   583篇
预防医学   143742篇
眼科学   41872篇
药学   133048篇
  1篇
中国医学   4122篇
肿瘤学   102530篇
  2018年   20240篇
  2017年   15365篇
  2016年   17351篇
  2015年   19406篇
  2014年   27175篇
  2013年   40798篇
  2012年   55494篇
  2011年   59195篇
  2010年   34766篇
  2009年   33098篇
  2008年   55001篇
  2007年   58494篇
  2006年   59250篇
  2005年   57247篇
  2004年   54999篇
  2003年   52462篇
  2002年   50963篇
  2001年   90990篇
  2000年   93280篇
  1999年   77189篇
  1998年   21318篇
  1997年   19093篇
  1996年   19419篇
  1995年   18351篇
  1994年   16778篇
  1993年   15818篇
  1992年   58492篇
  1991年   56955篇
  1990年   55275篇
  1989年   52866篇
  1988年   48531篇
  1987年   47648篇
  1986年   44534篇
  1985年   42483篇
  1984年   32211篇
  1983年   27170篇
  1982年   16078篇
  1981年   14432篇
  1979年   28989篇
  1978年   20672篇
  1977年   17210篇
  1976年   16427篇
  1975年   17451篇
  1974年   21045篇
  1973年   20064篇
  1972年   18999篇
  1971年   17666篇
  1970年   16561篇
  1969年   15580篇
  1968年   14738篇
排序方式: 共有10000条查询结果,搜索用时 281 毫秒
61.
62.
63.
Pharmaceutical Chemistry Journal - Three extracts were produced from the above-ground part of the meadowsweet Filipendula ulmaria (L.) Maxim. using water, 40% ethanol, and 70% ethanol. Comparative...  相似文献   
64.
Behçet disease is a complex, multisystem disease characterized by recurrent oral and genital ulcerations. It rarely occurs in infants or children. Neonatal Behçet disease has been reported in infants whose ulcers resolve at or before 9 weeks of age. Few cases of neonatal Behçet disease persisting into childhood have previously been reported. We report the case of a 1‐month‐old infant who presented with severe recurrent genital ulcerations and at 6 months developed recurrent oral ulcerations. Her orogenital ulcerations continue to recur. Human leukocyte antigen testing revealed HLA‐B51 and B44 positivity. This is a case of pediatric Behçet disease in the neonatal period. Behçet disease should be considered in the differential diagnosis of recurrent genital and oral ulcerations in infants and children.  相似文献   
65.
66.
AimsWe previously showed that the protective effects of endothelial progenitor cells (EPCs)‐released exosomes (EPC‐EXs) on endothelium in diabetes. However, whether EPC‐EXs are protective in diabetic ischemic stroke is unknown. Here, we investigated the effects of EPC‐EXs on diabetic stroke mice and tested whether miR‐126 enriched EPC‐EXs (EPC‐EXsmiR126) have enhanced efficacy.MethodsThe db/db mice subjected to ischemic stroke were intravenously administrated with EPC‐EXs 2 hours after ischemic stroke. The infarct volume, cerebral microvascular density (MVD), cerebral blood flow (CBF), neurological function, angiogenesis and neurogenesis, and levels of cleaved caspase‐3, miR‐126, and VEGFR2 were measured on day 2 and 14.ResultsWe found that (a) injected EPC‐EXs merged with brain endothelial cells, neurons, astrocytes, and microglia in the peri‐infarct area; (b) EPC‐EXsmiR126 were more effective than EPC‐EXs in decreasing infarct size and increasing CBF and MVD, and in promoting angiogenesis and neurogenesis as well as neurological functional recovery; (c) These effects were accompanied with downregulated cleaved caspase‐3 on day 2 and vascular endothelial growth factor receptor 2 (VEGFR2) upregulation till day 14.ConclusionOur results indicate that enrichment of miR126 enhanced the therapeutic efficacy of EPC‐EXs on diabetic ischemic stroke by attenuating acute injury and promoting neurological function recovery.  相似文献   
67.
68.
Nevo  N.  Goldstein  A. L.  Staierman  M.  Eran  N.  Carmeli  I.  Rayman  S.  mnouskin  Y. 《Hernia》2022,26(6):1491-1499
Hernia - The minimally invasive surgical repair of combined inguinal and ventral hernias often requires shifting from one approach or plane to another. The traditional enhanced-view totally...  相似文献   
69.

Researchers have highlighted numerous sociocultural factors that have been shown to underpin human appearance enhancement practices, including the influence of peers, family, the media, and sexual objectification. Fewer scholars have approached appearance enhancement from an evolutionary perspective or considered how sociocultural factors interact with evolved psychology to produce appearance enhancement behavior. Following others, we argue that evidence from the field of evolutionary psychology can complement existing sociocultural models by yielding unique insight into the historical and cross-cultural ubiquity of competition over aspects of physical appearance to embody what is desired by potential mates. An evolutionary lens can help to make sense of reliable sex and individual differences that impact appearance enhancement, as well as the context-dependent nature of putative adaptations that function to increase physical attractiveness. In the current review, appearance enhancement is described as a self-promotion strategy used to enhance reproductive success by rendering oneself more attractive than rivals to mates, thereby increasing one’s mate value. The varied ways in which humans enhance their appearance are described, as well as the divergent tactics used by women and men to augment their appearance, which correspond to the preferences of opposite-sex mates in a heterosexual context. Evolutionarily relevant individual differences and contextual factors that vary predictably with appearance enhancement behavior are also discussed. The complementarity of sociocultural and evolutionary perspectives is emphasized and recommended avenues for future interdisciplinary research are provided for scholars interested in studying appearance enhancement behavior.

  相似文献   
70.
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