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   162570篇
  免费   31691篇
  国内免费   2505篇
耳鼻咽喉   5242篇
儿科学   5590篇
妇产科学   2777篇
基础医学   4597篇
口腔科学   1846篇
临床医学   27405篇
内科学   50568篇
皮肤病学   7618篇
神经病学   15899篇
特种医学   6865篇
外科学   42679篇
综合类   262篇
现状与发展   72篇
一般理论   1篇
预防医学   7423篇
眼科学   3465篇
药学   1537篇
中国医学   31篇
肿瘤学   12889篇
  2024年   694篇
  2023年   4845篇
  2022年   1363篇
  2021年   3420篇
  2020年   6175篇
  2019年   2419篇
  2018年   7687篇
  2017年   7555篇
  2016年   8667篇
  2015年   8699篇
  2014年   15941篇
  2013年   16186篇
  2012年   6277篇
  2011年   6304篇
  2010年   10857篇
  2009年   14694篇
  2008年   6633篇
  2007年   4873篇
  2006年   7265篇
  2005年   4593篇
  2004年   3767篇
  2003年   2683篇
  2002年   2683篇
  2001年   3854篇
  2000年   3051篇
  1999年   3277篇
  1998年   3766篇
  1997年   3553篇
  1996年   3465篇
  1995年   3280篇
  1994年   2025篇
  1993年   1631篇
  1992年   1426篇
  1991年   1449篇
  1990年   1096篇
  1989年   1210篇
  1988年   1038篇
  1987年   864篇
  1986年   912篇
  1985年   740篇
  1984年   573篇
  1983年   540篇
  1982年   542篇
  1981年   431篇
  1980年   388篇
  1979年   325篇
  1978年   332篇
  1977年   404篇
  1975年   285篇
  1972年   308篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
CONTEXT: The physician assistant profession has been moving toward requiring master's degrees for new practitioners, but some argue this could change the face of the discipline. PURPOSE: To see if there is an association between physician assistants' academic degrees and practice in primary care, in rural areas, and with the medically underserved. METHODS: Surveys were sent to 880 graduates of the first 32 University of Washington physician assistant classes through 2000. Respondents noted their academic degree at program entry and the highest degree attained at any time up to the time of survey. Relationships between practice characteristics and academic degree levels were tested by unadjusted odds ratios and logistic regression after controlling for year of graduation and sex. RESULTS: Of the 478 respondents, 54% worked in primary care, about 30% practiced in nonmetropolitan communities, and 42% reported providing care for the medically underserved. Respondents with no degree (33% of total at entry, 24% at survey) were significantly more likely than degree holders to work in primary care and nonmetropolitan areas. Respondents with no degree at program entry were significantly more likely, and those with no degree at the time of the survey were marginally more likely, to self-report work with the medically underserved. CONCLUSION: Respondents with no academic degree are significantly more likely to demonstrate a commitment to primary, rural, and underserved health care. These findings may inform the national debate about the impact of required advanced degrees on the practice patterns of nonphysician providers.  相似文献   
32.
33.
34.
This review discusses treatment options for men with premature ejaculation (PE), a common sexual dysfunction characterized by short ejaculatory latency, decreased sexual satisfaction, and distress. For a number of reasons, including embarrassment and the belief that PE is a normal part of aging, that it has no effective treatment, or that it will resolve itself, few men with PE seek treatment. Although several treatment options exist (eg, behavioral, cognitive, and sex therapy methods; desensitizing drugs; off-label use of antidepressants, phosphodiesterase type 5 inhibitors, or à-blockers), the majority of men with PE are not satisfied with their results. New pharmacologic drugs develped specifically for the treatment of PE are undergoing evaluation in clinical trials. For example, recent clinical research studies have revealed on-demand administration of one such drug, dapoxetine, which achieved significant improvements in ejaculatory latency, control over ejaculation, and satisfaction with sexual intercourse. In addition, partners of men who received dapoxetine likewise reported improved satisfaction with sexual intercourse. Future studies may reveal that integration of pharmacologic drugs with psychologic and/or behavioral therapy techniques may be the optimal approach to the management of PE. PE is a treatable condition, and new drugs in development may provide benefits over those available.  相似文献   
35.
36.
37.
Editorial     
  相似文献   
38.
In the last 20 years, cases of human cryptococcosis, have increased in immunocompromised patients. In several instances, the cases have been associated with the exposure of the patients to bird droppings. In order to investigate birds of prey as potential carriers and spreaders of Cryptococcus neoformans and other yeasts of importance in human infections, 182 swab samples were collected from the cloacae of several species of birds of prey (Group I) and 32 faecal samples from aviaries in which the birds were housed (Group II). Samples were also taken from digestive tract of 60 dead birds (Group III). A total of 454 samples were cultured from which 215 colonies of yeastlike fungi were recovered and identified. Cryptococcusneoformans var. grubii was isolated from three cloacae samples (4.8%) collected from Falco tinnunculus and from one sample (3.1%) obtained from Buteo buteo, as well as from samples collected at the aviaries in which these birds were kept. Overall, 18 samples (9.9%) from Group I, 13 (40.6%) from Group II, 12 crops (20%), three proventriculi (5%) and 12 cloacae (20%) from Group III yielded positive cultures for yeasts. The results indicate that birds of prey and in particular, F. tinnunculus and B. buteo, may act as carriers and spreaders of C. neoformans and other zoonotic yeasts.  相似文献   
39.
40.
Prostatitis and male infertility are frequent disorders, and the role of prostatitis in male infertility has been under discussion for more than 30 years. Many researchers have shown relevant links between the two. Although a causal relationship has not been definitely demonstrated, increasing evidence shows that chronic prostatitis has a relevant negative impact on male fertility potential, at least in certain subgroups. In the following review, we focus on the present state of knowledge on the role of chronic prostatitis as an etiologic factor in male infertility.  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