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   8875篇
  免费   758篇
  国内免费   9篇
耳鼻咽喉   42篇
儿科学   207篇
妇产科学   115篇
基础医学   1096篇
口腔科学   327篇
临床医学   961篇
内科学   2009篇
皮肤病学   70篇
神经病学   665篇
特种医学   268篇
外科学   1407篇
综合类   122篇
一般理论   5篇
预防医学   938篇
眼科学   151篇
药学   725篇
中国医学   14篇
肿瘤学   520篇
  2022年   73篇
  2021年   174篇
  2020年   88篇
  2019年   169篇
  2018年   207篇
  2017年   160篇
  2016年   159篇
  2015年   178篇
  2014年   265篇
  2013年   396篇
  2012年   579篇
  2011年   560篇
  2010年   303篇
  2009年   291篇
  2008年   478篇
  2007年   500篇
  2006年   482篇
  2005年   468篇
  2004年   464篇
  2003年   386篇
  2002年   432篇
  2001年   160篇
  2000年   153篇
  1999年   181篇
  1998年   79篇
  1997年   90篇
  1996年   67篇
  1995年   68篇
  1994年   61篇
  1993年   49篇
  1992年   117篇
  1991年   107篇
  1990年   104篇
  1989年   106篇
  1988年   102篇
  1987年   92篇
  1986年   89篇
  1985年   89篇
  1984年   87篇
  1983年   85篇
  1982年   83篇
  1981年   70篇
  1980年   45篇
  1979年   71篇
  1978年   47篇
  1977年   48篇
  1976年   52篇
  1974年   46篇
  1972年   42篇
  1968年   35篇
排序方式: 共有9642条查询结果,搜索用时 15 毫秒
51.
52.
The treatment of antibody-mediated spermagglutination by corticosteroidtherapy has a high incidence of side-effects and sperm washingis often followed by re-agglutination. The possibility of enzymaticdisagglutination was therefore investigated. In the first partof the study the effects of four proteases on sperm motility,vitality and longevity were evaluated. Subtilisin had prohibitivelydetrimental effects even at 10 U/ml. However, chymotrypsin (500U/ml), trypsin (500 U/ml) and papain (50 U/ml) had no adverseeffects. In the second series of experiments one or more ofthese latter three enzymes was found to disagglutinate spermatozoawhich had previously been incubated with sperm-agglutinatingantibody-positive sera in 87% of cases. Although further investigationis required, enzymatic disagglutination may be beneficial forthe treatment of immunologically mediated spermagglutination.  相似文献   
53.
The article describes the computerized system developed and used at the Ohio State University Medical Center in Columbus, Ohio to affix a physician's signature electronically. The system electronically sends dictated reports (e.g., discharge summaries, history and physical examinations, and operative reports) and attestation statements to the physician for review. The physician selects the report individually and may approve or enter comments. Comments are forwarded electronically to medical information management. The article describes the fiscal intermediary's requirements and approval process and the impact on delinquent records and accounts awaiting attestation signature before billing.  相似文献   
54.
55.
The United States Military deploys its forces with minimal lead time. These forces must be medically qualified and physically fit for any locale and mission scenario. Historically, up to half of the force identified for deployment at any given time were not medically qualified. Matching individuals to specific occupations using validated medical and physical performance standards is an occupational medicine tenet that increases the effectiveness and efficiency of the workforce. To establish a cost-effective, valid medical program ensuring a fit and ready force, the military must: (1) develop validated physical fitness/occupational standards; (2) consolidate one fitness standard for males/females on the basis of workload requirements; (3) eliminate differing age standards; (4) provide statistically relevant medical screening, testing for health maintenance, and fitness for duty; and (5) mandate one joint medical standard for all military services.  相似文献   
56.
57.
This article uses linked data from the 1995 Morocco DHS calendar and the 1992 Morocco DHS service-availability module to study the effect of service environment on contraceptive discontinuation, switching, and adoption of a modern method following a birth. The 1995 Morocco DHS also collected information on the source of supply for each episode of use of a modern method recorded in the calendar, allowing study of the association between the source of supply and discontinuation and switching rates. Multilevel event-history models are used to evaluate the impact of individual-level sociodemographic characteristics and community-level indicators of family planning service provision. The findings show that the presence of a nearby public health center is associated with higher modern-method adoption after a birth and lower method-failure rates; the presence of a pharmacy is associated with lower discontinuation due to side effects or health concerns. The degree of method-choice potential has a positive impact on both the rate of switching from the pill to another modern method and on modern-method adoption after a birth.  相似文献   
58.
Nausea and vomiting are common side effects of opioids administered for pain control. This double-blind, randomized, parallel-group study evaluated the anti-emetic efficacy and tolerability of single intravenous (i.v.) doses of ondansetron 8 mg, ondansetron 16 mg and metoclopramide 10 mg in the treatment of opioid-induced emesis. Adult patients undergoing low emetogenic surgical procedures, using a standardized anaesthesia regimen were assessed for 24 h following administration of study anti-emetic to treat established post-surgical opioid-induced emesis. A total of 4511 patients were enrolled of whom 1366 experienced opioid-induced emesis and received randomized study medication. Ondansetron 8 mg and 16 mg were significantly better than metoclopramide 10 mg (P < 0.05) for both complete control of emesis, complete control of nausea and other efficacy measures. There were no significant differences between the two ondansetron groups. All three treatments were well tolerated. In conclusion, this large, multicentre study demonstrates that ondansetron is more effective than metoclopramide in the treatment of opioid-induced emesis following administration of post-surgical opioids to control pain.  相似文献   
59.
Curtis D  Zhao JH  Sham PC 《Genetic epidemiology》1999,17(Z1):S115-S120
We compared the NPLALL statistic from GENEHUNTER with two-point and three-point MALODs and MFLODs from MFLINK for all autosomal markers in the Collaborative Study on the Genetics of Alcoholism (COGA) data set. In general MFLINK produced more significant results than GENEHUNTER and implicated two regions containing candidate genes (ADH3 and DRD2). Many regions of interest identified in other studies reported at this workshop produced MALODs significant at p < or = 0.05, but these would not have been picked up by GENEHUNTER unless a less significant threshold were used.  相似文献   
60.
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