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   20134篇
  免费   1314篇
  国内免费   91篇
耳鼻咽喉   175篇
儿科学   533篇
妇产科学   360篇
基础医学   2748篇
口腔科学   380篇
临床医学   2107篇
内科学   4239篇
皮肤病学   182篇
神经病学   1842篇
特种医学   636篇
外国民族医学   1篇
外科学   2713篇
综合类   243篇
一般理论   51篇
预防医学   2402篇
眼科学   364篇
药学   1246篇
中国医学   33篇
肿瘤学   1284篇
  2023年   125篇
  2022年   162篇
  2021年   490篇
  2020年   307篇
  2019年   419篇
  2018年   543篇
  2017年   389篇
  2016年   400篇
  2015年   439篇
  2014年   673篇
  2013年   915篇
  2012年   1488篇
  2011年   1666篇
  2010年   883篇
  2009年   704篇
  2008年   1309篇
  2007年   1513篇
  2006年   1287篇
  2005年   1349篇
  2004年   1271篇
  2003年   1159篇
  2002年   1058篇
  2001年   274篇
  2000年   205篇
  1999年   285篇
  1998年   203篇
  1997年   144篇
  1996年   124篇
  1995年   126篇
  1994年   89篇
  1993年   95篇
  1992年   130篇
  1991年   113篇
  1990年   111篇
  1989年   105篇
  1988年   87篇
  1987年   71篇
  1986年   64篇
  1985年   72篇
  1984年   69篇
  1983年   66篇
  1982年   56篇
  1981年   63篇
  1980年   34篇
  1979年   26篇
  1978年   39篇
  1977年   36篇
  1976年   39篇
  1975年   35篇
  1974年   32篇
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
41.
42.
In an effort to improve Health Risk Appraisals and to induce individuals to change their lifestyles, comprehensive evaluations and counseling sessions were carried out for 476 participants of an experimental preventive care program (1984). Nurse practitioners interviewed participants in their homes and collected information about their lifestyle, medical history, and family history. In addition, physical examinations were performed and blood samples were obtained for laboratory analysis. This information was used to formulate health risk profiles for all participants who were then counseled on how to decrease identified health risks. Interventions included education about health risks and specific programs which were administered to help modify high-risk behaviors. At one year follow-up, significant risk reductions were reported in many areas of increased risk.Victor W. Acquista, M.D., is a Fellow in General Internal Medicine, Rhode Island Hospital. Tom J. Wachtel, M.D., is Director, Medical Primary Care Unit, Rhode Island Hospital, and Assistant Professor of Community Health, Brown University. Celia I. Gomes, M.P.H., is Health Education Coordinator, Blue Cross/Blue Shield of Rhode Island. Michael Salzillo, M.S., is Team Leader, Statistical Analysis Department, Blue Cross/Blue Shield of Rhode Island. Melanie Stockman, R.N., is Director of Ambulatory Nursing, Rhode Island Hospital.  相似文献   
43.
A total of 91 eligible patients with metastatic cancer have been treated in a series of phase II trials of the novel pentacyclic pyrroloquinone, fosquidone. Tumour types were breast (24), ovary (25), head and neck (21) and melanoma (21). All patients, except those with melanoma had received prior chemotherapy. The drug was given intravenously as a 20 min infusion, at the dose of 120 mg/m2 on days 1 to 5 of a 3 week cycle. Treatment was well tolerated; the only significant side-effects being mild headaches and generalised musculo-skeletal pains. Response was assessed after 2 cycles of therapy. Only one patient (with head and neck cancer) achieved an objective partial response, lasting 6 weeks. A total of 12 patients demonstrated stable disease for a median duration of 15 to 20 weeks. Using this schedule of administration, fosquidone has no significant antitumour activity in this group of tumours.  相似文献   
44.
PURPOSETo evaluate scanning parameters (conventional versus spiral CT, section thickness, and pitch) and vessel orientation in the performance of CT angiography.METHODSConventional CT and 1.0-, 1.5-, and 2.0-pitch spiral CT acquisitions of a carotid phantom designed with vessels oriented parallel to the z-axis, 45 degrees oblique, and perpendicular to the z-axis were obtained with section thicknesses of 2, 4, and 8 mm. The phantom contained 32 vessels with 0% to 100% stenoses. Normal and stenotic luminal diameters were measured and the number of artifacts was assessed.RESULTSNo overall difference was observed among conventional and spiral CT acquisitions obtained with pitches of 1.0, 1.5, and 2.0. With thicker sections, CT angiographic accuracy decreased and artifacts increased. The three-vessel orientations were relatively comparable in accuracy in terms of the percentage of stenosis measured. Vessels parallel to the z-axis suffered less artifactual degradation. Unique artifacts, such as luminal distortion and beam hardening, were observed in vessels oriented at 45 degrees and perpendicular to the z-axis.CONCLUSIONUse of thinner sections with vessels oriented parallel to the z-axis optimizes CT angiographic quality. There is no apparent degradation with the use of spiral CT, and a pitch of 1.5 or 2.0 provides results equivalent to 1.0-pitch spiral studies.  相似文献   
45.
Book reviewed in this article: Life and Death: Philosophical Essays in Biomedical Ethics. By Dan W. Brock.  相似文献   
46.
47.
48.
49.
Little is known about the quality of pharmacy services provided to the rural elderly population. This exploratory study examines rural/urban and ethnic differences in perceived access to ancillary pharmacy services among elderly people. Two telephone surveys were conducted using directory listings in West Texas to generate a longitudinal sample. Persons aged 65 years and older who were not cognitively impaired were asked to complete the survey. The number of participants in both rounds of the survey was 3,689. Seven ancillary pharmacy services were examined: delivery of medications, medication counseling, written medication information, blood pressure monitoring, blood glucose monitoring, osteoporosis screening, and immunization. The sample was stratified by county of residence (urban, rural, or frontier) and racial/ethnic background. Chi-square tests were performed to detect rural/urban and racial/ethnic differences in access to the seven ancillary services. The association between proficiency in English and access to the services was also examined. Rural residents were more likely than urban residents to report that their pharmacies provide delivery of medications, medication counseling, and immunization services, but they were less likely than their urban counterparts to report that their pharmacies provide blood pressure monitoring. Access to ancillary pharmacy services was reported as poorer by older Hispanic people compared with non-Hispanics. Deficiency in English was significantly related to inequality in reported access to ancillary pharmacy services. It is essential to consider the special needs of rural and Hispanic elderly people to ensure equitable access to ancillary pharmacy services.  相似文献   
50.
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