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   196365篇
  免费   33998篇
  国内免费   2543篇
耳鼻咽喉   5642篇
儿科学   6531篇
妇产科学   3208篇
基础医学   9276篇
口腔科学   2701篇
临床医学   30982篇
内科学   56192篇
皮肤病学   8103篇
神经病学   19226篇
特种医学   8749篇
外国民族医学   6篇
外科学   47477篇
综合类   818篇
现状与发展   72篇
一般理论   40篇
预防医学   10869篇
眼科学   4484篇
药学   3759篇
中国医学   75篇
肿瘤学   14696篇
  2024年   702篇
  2023年   4946篇
  2022年   1494篇
  2021年   3811篇
  2020年   6549篇
  2019年   2897篇
  2018年   8205篇
  2017年   7997篇
  2016年   9186篇
  2015年   9318篇
  2014年   16741篇
  2013年   17407篇
  2012年   8369篇
  2011年   8537篇
  2010年   12034篇
  2009年   15725篇
  2008年   8644篇
  2007年   6977篇
  2006年   9408篇
  2005年   6625篇
  2004年   5728篇
  2003年   4639篇
  2002年   4627篇
  2001年   4354篇
  2000年   3526篇
  1999年   3802篇
  1998年   4194篇
  1997年   3874篇
  1996年   3730篇
  1995年   3565篇
  1994年   2227篇
  1993年   1828篇
  1992年   1720篇
  1991年   1725篇
  1990年   1345篇
  1989年   1476篇
  1988年   1293篇
  1987年   1146篇
  1986年   1152篇
  1985年   1001篇
  1984年   843篇
  1983年   806篇
  1982年   827篇
  1981年   695篇
  1980年   619篇
  1979年   526篇
  1978年   554篇
  1977年   584篇
  1975年   448篇
  1972年   448篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
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   
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.
There are an estimated 200 million users of an illicit drug in the world today. In addition, an estimated 40 million people are infected with the human immunodeficiency virus (HIV) and an estimated 180 million people are infected with the hepatitis C virus (HCV). Both the use of an illicit drug and the co-occurrence of infections are associated with a multitude of medical and health consequences including hormonal and metabolic disorders. Thus, the National Institute on Drug Abuse (NIDA), a part of the National Institutes of Health (NIH) hosted a workshop on hormonal and metabolic disorders of HIV among substance abusers. A number of clinicians and scientists participated and discussed a wide range of issues concerning hormones, nutrition and metabolic complications in HIV and substance abuse. Their observations and the recommendations they made for future research are presented in these proceedings. The readers are encouraged to contact the NIH staff (JK, FV) for technical guidance and programmatic priorities on the subject and directly contact the individual authors for collaborations.  相似文献   
38.
39.
40.
INTRODUCTION: The clinical presentation of morphea varies from localized plaques to generalized eruptions. Its cause remains unknown and medical treatments have often proved unsatisfactory. Studies have previously shown that improvement of hypertrophic scars and fibrotic skin can be achieved with the use of a 585 nm pulsed dye laser (PDL). METHODS: A case of plaque-type morphea was treated with 585 nm pulsed dye laser irradiation at an average fluence of 5.0 J/cm2 at bimonthly time intervals. RESULTS: Marked clinical improvement as evidenced by improved pliability and skin coloration was seen after 4 successive PDL treatments. No side effects or complications were encountered. CONCLUSION: Pulsed dye laser therapy is a viable treatment option for morphea. The mechanism of its effect in this condition remains unknown.  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