全文获取类型
收费全文 | 10531篇 |
免费 | 752篇 |
国内免费 | 35篇 |
专业分类
耳鼻咽喉 | 63篇 |
儿科学 | 363篇 |
妇产科学 | 196篇 |
基础医学 | 1274篇 |
口腔科学 | 151篇 |
临床医学 | 1008篇 |
内科学 | 2098篇 |
皮肤病学 | 102篇 |
神经病学 | 922篇 |
特种医学 | 368篇 |
外科学 | 1539篇 |
综合类 | 251篇 |
一般理论 | 9篇 |
预防医学 | 983篇 |
眼科学 | 282篇 |
药学 | 821篇 |
中国医学 | 46篇 |
肿瘤学 | 842篇 |
出版年
2023年 | 48篇 |
2022年 | 77篇 |
2021年 | 203篇 |
2020年 | 133篇 |
2019年 | 220篇 |
2018年 | 226篇 |
2017年 | 169篇 |
2016年 | 196篇 |
2015年 | 209篇 |
2014年 | 356篇 |
2013年 | 465篇 |
2012年 | 755篇 |
2011年 | 788篇 |
2010年 | 401篇 |
2009年 | 399篇 |
2008年 | 659篇 |
2007年 | 791篇 |
2006年 | 731篇 |
2005年 | 726篇 |
2004年 | 663篇 |
2003年 | 629篇 |
2002年 | 568篇 |
2001年 | 85篇 |
2000年 | 72篇 |
1999年 | 89篇 |
1998年 | 120篇 |
1997年 | 119篇 |
1996年 | 90篇 |
1995年 | 84篇 |
1994年 | 71篇 |
1993年 | 79篇 |
1992年 | 63篇 |
1991年 | 36篇 |
1990年 | 41篇 |
1989年 | 42篇 |
1988年 | 41篇 |
1987年 | 39篇 |
1986年 | 41篇 |
1985年 | 45篇 |
1984年 | 54篇 |
1983年 | 38篇 |
1982年 | 56篇 |
1981年 | 51篇 |
1980年 | 49篇 |
1979年 | 27篇 |
1978年 | 30篇 |
1977年 | 22篇 |
1974年 | 20篇 |
1973年 | 30篇 |
1972年 | 21篇 |
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
21.
22.
Antibody Conjugates for the Treatment of Cancer 总被引:3,自引:0,他引:3
23.
24.
Geoffrey G Hallock 《CANADIAN JOURNAL OF PLASTIC SURGERY》2003,11(2):67-69
The use of the radial artery as an alternative vascular conduit for coronary bypass surgery has become increasingly popular. The plastic surgery experience with radial forearm flaps has shown that sacrifice of the radial artery is not always a benign maneuver. The potential morbidity after using this conduit donor site in terms of hand dysfunction or wound healing problems can be significant, and frequently must ultimately be addressed as part of the role of the reconstructive surgeon. Case examples of skin necrosis, subsequent forearm wound infection and hypertrophic scarring after radial artery harvest are presented to introduce this as a real concern and to allow a review of the entire spectrum of potential problems in this regard. Any selection process where the radial artery may be chosen as the coronary revascularization conduit must anticipate these known donor site complications. 相似文献
25.
26.
Egidio L. Romano res Soyano Ramón F. Montaño Murray Ratcliffe Marilyn Olson Guillermo Suarez Nelly Martínez and Geoffrey Worstey 《Vox sanguinis》1994,66(3):194-199
Thirteen infants, 10 with A-O and 3 with B-O hemolytic disease of the newborn (ABO-HDN), were treated with synthetic A or B blood group trisaccharides (ATS, BTS) which cause dissociation of maternal antibody bound to infant red cells. The clinical outcome was compared with that of a control group of 21 infants treated with phototherapy during the preceding year. Exchange transfusion was required in 2 out of 13 infants in the experimental group and in 7 in the control group. A randomized prospective controlled study is necessary to confirm these results. 相似文献
27.
PURPOSE: To assess the consistency of ratings assigned by health sciences faculty members relative to community members during an innovative admissions protocol called the Multiple Mini-Interview (MMI). METHOD: A nine-station MMI was created and 54 candidates to an undergraduate MD program participated in the exercise in Spring 2003. Three stations were staffed with a pair of faculty members, three with a pair of community members, and three with one member of each group. Raters completed a four-item evaluation form. All participants completed post-MMI questionnaires. Generalizability Theory was used to examine the consistency of the ratings provided within each of these three subgroups. RESULTS: The overall test reliability was found to be .78 and a Decision Study suggested that admissions committees should distribute their resources by increasing the number of interviews to which candidates are exposed rather than increasing the number of interviewers within each interview. Divergence of ratings was greater within the pairing of community member to faculty member and least for pairings of community members. Participants responded positively to the MMI. CONCLUSION: The MMI provides a reliable protocol for assessing the personal qualities of candidates by accounting for context specificity with a multiple sampling approach. Increasing the heterogeneity of interviewers may increase the heterogeneity of the accepted group of candidates. Further work will determine the extent to which different groups of raters provide equally valid (albeit different) judgments. 相似文献
28.
29.
Transformation of Penicillium chrysogenum using the Aspergillus nidulans amdS gene as a dominant selective marker 总被引:5,自引:0,他引:5
Summary The Aspergillus nidulans acetamidase gene (amdS) has been used to transform Penicillium chrysogenum at low frequency. Several transformants were tested and shown to be mitotically stable. Southern blot analysis indicated that transforming DNA had integrated into the chromosomal DNA, possibly at multiple sites. 相似文献
30.
Conventionally a confidence interval (CI) for the standardized mortality ratio is set using the conservative CI for a Poisson expectation, μ. Employing the mid-P argument we present alternative CIs that are shorter than the conventional ones. The mid-P intervals do not guarantee the nominal confidence level, but the true coverage probability is only lower than the nominal level for a few short ranges of μ. The implications for mid-P confidence intervals of various proposed definitions of two-sided tests for discrete data are discussed. 相似文献