全文获取类型
收费全文 | 20134篇 |
免费 | 1314篇 |
国内免费 | 91篇 |
专业分类
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 |
出版年
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.
Victor W. Acquista M.D. Tom J. Wachtel M.D. Celia I. Gomes M.P.H. Michael Salzillo M.S. Melanie Stockman R.N. 《Journal of community health》1988,13(1):43-52
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.
S B Kaye J Wanders M Clavel J Verweij M J Piccart J F Smyth W W Ten Bokkel Huinink D J Wagener I R Judson F Cavalli 《Annals of oncology》1992,3(5):406-408
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.
S W Wise K D Hopper T A Schwartz T R Ten Have C J Kasales 《AJNR. American journal of neuroradiology》1997,18(3):401
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.
Tom Tomlinson 《The Hastings Center report》1994,24(4):43-44
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.