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   5677篇
  免费   457篇
  国内免费   33篇
耳鼻咽喉   57篇
儿科学   269篇
妇产科学   84篇
基础医学   700篇
口腔科学   96篇
临床医学   704篇
内科学   1287篇
皮肤病学   65篇
神经病学   550篇
特种医学   317篇
外科学   692篇
综合类   228篇
一般理论   4篇
预防医学   475篇
眼科学   70篇
药学   331篇
  2篇
中国医学   2篇
肿瘤学   234篇
  2021年   74篇
  2020年   54篇
  2019年   82篇
  2018年   83篇
  2017年   71篇
  2016年   66篇
  2015年   85篇
  2014年   122篇
  2013年   192篇
  2012年   297篇
  2011年   287篇
  2010年   157篇
  2009年   144篇
  2008年   243篇
  2007年   298篇
  2006年   240篇
  2005年   233篇
  2004年   239篇
  2003年   202篇
  2002年   209篇
  2001年   190篇
  2000年   210篇
  1999年   157篇
  1998年   68篇
  1997年   63篇
  1996年   68篇
  1995年   84篇
  1994年   83篇
  1993年   76篇
  1992年   110篇
  1991年   125篇
  1990年   100篇
  1989年   109篇
  1988年   108篇
  1987年   103篇
  1986年   107篇
  1985年   109篇
  1984年   71篇
  1983年   79篇
  1982年   60篇
  1981年   46篇
  1980年   39篇
  1979年   58篇
  1978年   52篇
  1977年   39篇
  1976年   33篇
  1975年   36篇
  1973年   32篇
  1971年   31篇
  1968年   32篇
排序方式: 共有6167条查询结果,搜索用时 0 毫秒
31.
Alcoholic cirrhosis is one of the most common indications for liver transplantation. Previous researchers have studied rates of return to drinking following transplantation, however, few have employed prospective measures of alcohol use. The authors prospectively studied the alcohol use of patients transplanted for alcoholic liver disease. The authors improved the accuracy of monitoring alcohol use by using various methods for tracking patient's alcohol consumption, and we report on the time to first alcohol use after transplantation comparing these different methods. The authors found that alcohol use can occur very early after transplantation, even within the first 3 months posttransplant. Thirty-eight percent of the patients consumed any alcohol after transplantation. The clinical interviews by the psychiatrist were the most successful method for identifying posttransplant alcohol use. Posttransplant alcohol use was significantly associated with prior nonalcohol substance use (P < 0.025), family history of alcoholism in a first-degree relative (P < 0.025), and prior alcohol rehabilitation experience (P < 0.05) but not with a prior psychiatric history or less than 6 months of pretransplant sobriety. The authors indicate that prospective monitoring, using a combination of methods, is the most accurate approach to identify alcohol consumption. With this type of accuracy, risk factors can be identified and alcohol use can be compared with alcohol-related morbidity posttransplant.  相似文献   
32.
Limbic and basal forebrain-hypothalamic regions from male sheep differing in sexual performance were quantified for fos-like immunoreactivity. Rams classified as high-sexually performing (HP), low-sexually performing (LP), and male-oriented (MO) received noncontact sensory stimulation from either ewes in estrus (HP, n=5; LP, n=4; MO, n=4) or other males (HP, n=5; LP, n=4; MO, n=5) for a 4-h period on each of 3 consecutive days. Following exposure to stimulus animals on the third day, rams were euthanized and their brains were perfused with a 1% paraformaldehyde/1.5% glutaraldehyde solution and sections were analyzed for fos-like immunoreactivity. Brain regions analyzed were the medial amygdala (meAMY), medial preoptic area (mPOA), bed nucleus of the stria terminalis (BNST), and ventromedial hypothalamic nucleus (VMH). Fos-like immunoreactivity differed between groups in the mPOA and BNST but not in the meAMY or VMH. LP rams exposed to estrous ewes had more (P<.05) neurons staining positive for fos and fos-related antigens (FRA) in the mPOA and BNST than LP rams exposed to other rams or MO rams exposed to either estrous ewes or other rams. Numbers of neurons staining positive for FRA in the mPOA and BNST of LP rams exposed to estrous ewes, however, were not different (P>.05) from HP rams exposed to either estrous ewes or other rams. The similar fos-like immunoreactivity in areas important for the display of sexual behavior in HP and LP rams may reflect similar sensory input in these two groups of rams; however, LP rams, in contrast to HP rams, do not appear to respond similarly to the same sensory stimulus.  相似文献   
33.
34.
35.
36.
In a retrospective study of 153 testis cancer survivors, we examined the sociodemographic and clinical determinants of attitudes and behaviors toward illness-induced infertility. Five fertility adjustment responses were identified: sperm-banking awareness (SBA); adoption awareness (AA); fertility testing (FT); trying to father children (TFC); and fertility distress (FD). Although responses to infertility are multidetermined, these data demonstrate there is a distinct sociodemographic and clinical profile for the subgroups of men who engage in different fertility-related behaviors. Multivariate analysis results show that men most likely to be concerned with banking sperm are those who at diagnosis are younger (less than 35 years), childless, college educated, and whose relationships have become strained. Men who sought fertility tests were childless, college graduates, and able to ejaculate. The only factor predicting adoption was childlessness. Those married men attempting to father children were also less than 35 years of age at diagnosis and without ejaculatory dysfunction. The men at greatest risk for continued distress about infertility were those who remained childless and had posttreatment ejaculatory dysfunction. Residual infertility distress also was significantly associated with treatments that included extensive retroperitoneal lymph node dissection (RPLND) surgery, indicating that the latter is a "risk factor" in survivors' long-term distress. These data, while not definitive, show that the prerogative to have children is very important to men and that losing it sets into motion a range of both adverse emotions and adaptive responses. Adjustment to infertility is a complex process that begins at diagnosis and extends long after treatment is completed.  相似文献   
37.
38.
39.
40.
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