全文获取类型
收费全文 | 14782篇 |
免费 | 938篇 |
国内免费 | 50篇 |
专业分类
耳鼻咽喉 | 76篇 |
儿科学 | 419篇 |
妇产科学 | 400篇 |
基础医学 | 1768篇 |
口腔科学 | 178篇 |
临床医学 | 2256篇 |
内科学 | 3051篇 |
皮肤病学 | 179篇 |
神经病学 | 1430篇 |
特种医学 | 260篇 |
外科学 | 1310篇 |
综合类 | 390篇 |
一般理论 | 18篇 |
预防医学 | 2064篇 |
眼科学 | 287篇 |
药学 | 654篇 |
中国医学 | 17篇 |
肿瘤学 | 1013篇 |
出版年
2023年 | 79篇 |
2022年 | 90篇 |
2021年 | 263篇 |
2020年 | 152篇 |
2019年 | 239篇 |
2018年 | 284篇 |
2017年 | 219篇 |
2016年 | 232篇 |
2015年 | 290篇 |
2014年 | 433篇 |
2013年 | 700篇 |
2012年 | 989篇 |
2011年 | 1133篇 |
2010年 | 602篇 |
2009年 | 524篇 |
2008年 | 1003篇 |
2007年 | 1059篇 |
2006年 | 1007篇 |
2005年 | 1008篇 |
2004年 | 985篇 |
2003年 | 895篇 |
2002年 | 844篇 |
2001年 | 129篇 |
2000年 | 115篇 |
1999年 | 150篇 |
1998年 | 209篇 |
1997年 | 150篇 |
1996年 | 131篇 |
1995年 | 123篇 |
1994年 | 105篇 |
1993年 | 94篇 |
1992年 | 80篇 |
1991年 | 64篇 |
1990年 | 70篇 |
1989年 | 71篇 |
1988年 | 64篇 |
1987年 | 50篇 |
1986年 | 63篇 |
1985年 | 57篇 |
1984年 | 70篇 |
1983年 | 84篇 |
1982年 | 76篇 |
1981年 | 80篇 |
1980年 | 65篇 |
1979年 | 55篇 |
1978年 | 59篇 |
1977年 | 45篇 |
1976年 | 38篇 |
1975年 | 38篇 |
1974年 | 36篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Lonský V Mand'ák J Kubícek J Volt M Procházka E Dominik J 《Acta medica (Hradec Králové) / Universitas Carolina, Facultas Medica Hradec Králové》2005,48(2):95-98
The very large patient (weight 142 kg, height 197 cm, body surface 2.76 m2) was referred to acute operation with dissecting type A ascending aortic aneurysm. The calculated blood flow was 6.63 l/min. To anticipate potential difficulties with perfusion and oxygenation two oxygenators connected in parallel were incorporated into the circuit. Bentall procedure with ACB to the RCA was performed. The perfusion was uneventful. Bypass time was 259 minutes, cross clamp time 141 minutes, circulatory arrest 7 minutes. The highest oxygenators gas flow was 2.6 l/min with maximum FiO2 0.42. The use of two in parallel connected oxygenators is a very effective, easy and safe method in such extreme perfusions, offering to the perfusionist a great reserve of oxygenator output. 相似文献
72.
Summary This report describes procedures for the isolation and maintenance of monolayer culture of adult rat liver hepatic parenchymal cells. Isolation of the cells is accomplished using perfusion in situ with a calcium-free buffer followed by buffered collagenase. Gravity sedimentation and selective media are used to limit the contribution of nonparenchymal cells in the cultures. 相似文献
73.
Detection of IgE-mediated respiratory sensitization in workers exposed to hexahydrophthalic anhydride 总被引:10,自引:0,他引:10
74.
Celia I. Kaye Alice O. Martin Beverly R. Rollnick R. Rollnick Konrad Nagatoshi Jeannette Israel Mark Hermanoff Brad Tropea Joan T. Richtsmeier Newton E. Morton 《American journal of medical genetics. Part A》1992,43(6):913-917
Seventy-four families of probands with oculoauriculovertebral anomaly were evaluated, including 116 parents and 195 off-spring. Relatives were examined to identify ear malformations, mandibular anomalies, and other craniofacial abnormalities. For segregation analysis using POINTER, selection of the sample was consistent with single as-certainment. Different population liabilities were used for probands and relatives, because affection was narrowly defined for probands and broadly defined for relatives. The hypothesis of no genetic transmission was rejected. The evidence favored autosomal dominant inheritance; recessive and polygenic models were not distinguishable. © 1992 Wiley-Liss, Inc. 相似文献
75.
Integrating complementary and alternative medicine instruction into health professions education: organizational and instructional strategies. 总被引:1,自引:0,他引:1
Mary Y Lee Rita Benn Leslie Wimsatt Jane Cornman Joan Hedgecock Susan Gerik Janice Zeller Mary Jo Kreitzer Pamela Allweiss Claudia Finklestein Aviad Haramati 《Academic medicine》2007,82(10):939-945
A few years ago, the National Institutes of Health National Center for Complementary and Alternative Medicine funded a program called the Complementary and Alternative Medicine (CAM) Education Project. Grantees were 14 medical and nursing schools and the American Medical Student Association, which funded six additional medical schools. Grants were awarded in cohorts of five per year in 2000, 2001, and 2002-2003.The R25 grant recipients identified several major themes as crucial to the success of integrating CAM into health professions curricula. The rationale for integrating CAM curricula was in part to enable future health professionals to provide informed advice as patients dramatically increase the use of CAM. Success of new CAM education programs relied on leadership, including top-down support from institutions' highest administrators. Formal and informal engagement of key faculty and opinion leaders raised awareness, interest, and participation in programs. A range of faculty development efforts increased CAM-teaching capacity. The most effective strategies for integration addressed a key curriculum need and used some form of evidence-based practice framework. Most programs used a combination of instructional delivery strategies, including experiential components and online resources, to address the needs of learners while promoting a high level of ongoing interest in CAM topics. Institutions noted several benefits, including increased faculty development activities, the creation of new programs, and increased cross- and inter-university collaborations. Common challenges included the need for qualified faculty, crowded and changing curricula, a lack of defined best practices in CAM, and post-grant sustainability of programs. 相似文献
76.
77.
Dean K Whitla Gary Orfield William Silen Carole Teperow Carolyn Howard Joan Reede 《Academic medicine》2003,78(5):460-466
PURPOSE: Many U.S. medical schools have abandoned affirmative action, limiting the recruitment and reducing the admission of underrepresented minority (URM) students even though research supports the premise that the public benefits from an increase in URM physicians and that URM physicians are likely to serve minority, poor, and Medicaid populations. Faculty and students commonly assume they benefit from peer cultural exchange, and the published evidence for the past two decades supports this notion. This research examined the students' perceptions of the educational merits of a diverse student body by surveying medical students at two schools. METHOD: In 2000, medical students from all four years at Harvard Medical School and the University of California, San Francisco, School of Medicine were enrolled in a telephone survey about the relevance of racial diversity (among students) in their medical education. Students responded to the interviewer's questions on a five-point Likert-type scale. RESULTS: Of the 55% of students who could be located, 97% responded to the survey. Students reported having little intercultural contact during their formative years but significantly more interactions during higher education years, especially in medical school. Students reported contacts with diverse peers greatly enhanced their educational experience. They strongly supported strengthening or maintaining current affirmative action policies in admissions. The responses and demography of the Harvard and UCSF students did not differ significantly, nor did they differ for majority students and URM students-all groups overwhelmingly thought that racial and ethnic diversity among their peers enhanced their education. CONCLUSIONS: Diversity in the student body enhanced the educational experiences of students in two U.S. medical schools. 相似文献
78.
Baldwin T Henri S Curtis J O'Keeffe M Vremec D Shortman K Handman E 《Infection and immunity》2004,72(4):1991-2001
Using a metacyclic promastigote ear infection model of cutaneous leishmaniasis, we examined the phenotype, parasite load, and cytokine production of dendritic cells in the skin and draining lymph nodes of resistant C57BL/6J and susceptible BALB/c mice. Five dendritic cell populations were isolated from the skin and lymph nodes, and the main difference between the groups of mice was an increased number of plasmacytoid dendritic cells in the lymph nodes of the susceptible mice. Although similar cell types were present in the skin emigrants of both strains, there was a 10-fold larger number of cells in BALB/c mouse skin early in infection than in C57BL/6J mouse skin. None of the dendritic cells in the lymph nodes harbored parasites until 3 weeks after infection, with the Langerhans cells having the largest load and the plasmacytoid dendritic cells having the smallest load but the longest lasting infection. Although parasites could be detected in the lymph nodes a few hours after infection, none of the skin emigrants harbored parasites, indicating that they are not the vehicle that ferries the parasites from the skin to the lymph nodes. The presence of larger numbers of plasmacytoid cells in infected BALB/c mice, the more protracted infection of these cells, and their production of alpha interferon point to a complex and important role for the plasmacytoid cells in leishmaniasis. 相似文献
79.
Yin CC Lin P Carney DA Handy BC Rassidakis GZ Admirand JH Keating MJ Medeiros LJ 《American journal of clinical pathology》2005,123(4):594-602
We studied the clinicopathologic, immunophenotypic, and cytogenetic features of 26 patients with chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL) associated with serum IgM paraprotein. The study group (16 men; 10 women; median age, 64 years; range, 40-82 years) represents approximately 2.5% of CLL/SLL cases at our institution. The paraprotein level ranged from 1 to 14 g/L (median, 4 g/L). Neoplasms in bone marrow were composed of small round lymphocytes arranged in nodular (n = 6), diffuse (n = 5), interstitial (n = 5), or mixed (n = 10) patterns. All cases were positive for monotypic surface immunoglobulin light chain, IgM/IgD, CD5, CD19, CD20, and CD23. CD11c (14/20 [70%]), CD79b (11/19 [58%]), FMC-7 (11/26 [42%]), CD22 (8/20 [40%]), and ZAP-70 (6/19 [32%]) were expressed in subsets of cases. Of 17 bone marrow specimens assessed by conventional cytogenetics, 6 were abnormal and 11 were diploid. The overall survival of this group (median follow-up, 24 months) was not significantly different from that for an age-, sex-and stage-matched group of 52 CLL/SLL patients without IgM paraprotein (P = .60). We conclude that CLL/SLL cases with serum IgM paraprotein are similar to other CLL/SLL cases in their clinicopathologic and immunophenotypic features. 相似文献
80.
George Capone Mary Stephens Stephanie Santoro Brian Chicoine Peter Bulova Moya Peterson Joan Jasien Anna Jo Smith Down Syndrome Medical Interest Group Adult Health Workgroup 《American journal of medical genetics. Part A》2020,182(7):1832-1845
Adults with Down syndrome (DS) represent a unique population who are in need of clinical guidelines to address their medical care. Many of these conditions are of public health importance with the potential to develop screening recommendations to improve clinical care for this population. Our workgroup previously identified and prioritized co‐occurring medical conditions in adults with DS. In this study, we again performed detailed literature searches on an additional six medical conditions of clinical importance. A series of key questions (KQ) were formulated a priori to guide the literature search strategy. Our KQs focused on disease prevalence, severity, risk‐factors, methodologies for screening/evaluation, impact on morbidity, and potential costs/benefits. The available evidence was extracted, evaluated and graded on quality. The number of participants and the design of clinical studies varied by condition and were often inadequate for answering most of the KQ. Based upon our review, we provide a summary of the findings on hip dysplasia, menopause, acquired cardiac valve disease, type 2 diabetes mellitus, hematologic disorders, and dysphagia. Minimal evidence demonstrates significant gaps in our clinical knowledge that compromises clinical decision‐making and management of these medically complex individuals. The creation of evidence‐based clinical guidance for this population will not be possible until these gaps are addressed. 相似文献