全文获取类型
收费全文 | 497038篇 |
免费 | 35740篇 |
国内免费 | 15413篇 |
专业分类
耳鼻咽喉 | 4943篇 |
儿科学 | 12632篇 |
妇产科学 | 8899篇 |
基础医学 | 50273篇 |
口腔科学 | 10468篇 |
临床医学 | 51403篇 |
内科学 | 72683篇 |
皮肤病学 | 6869篇 |
神经病学 | 29008篇 |
特种医学 | 11015篇 |
外国民族医学 | 74篇 |
外科学 | 47331篇 |
综合类 | 76647篇 |
现状与发展 | 42篇 |
一般理论 | 29篇 |
预防医学 | 48258篇 |
眼科学 | 8442篇 |
药学 | 46825篇 |
430篇 | |
中国医学 | 36531篇 |
肿瘤学 | 25389篇 |
出版年
2024年 | 1459篇 |
2023年 | 7222篇 |
2022年 | 13714篇 |
2021年 | 18449篇 |
2020年 | 17054篇 |
2019年 | 22482篇 |
2018年 | 20206篇 |
2017年 | 17720篇 |
2016年 | 15922篇 |
2015年 | 15565篇 |
2014年 | 29516篇 |
2013年 | 31964篇 |
2012年 | 28282篇 |
2011年 | 30655篇 |
2010年 | 25010篇 |
2009年 | 23185篇 |
2008年 | 23085篇 |
2007年 | 23484篇 |
2006年 | 20812篇 |
2005年 | 18144篇 |
2004年 | 15046篇 |
2003年 | 13141篇 |
2002年 | 10593篇 |
2001年 | 9440篇 |
2000年 | 7768篇 |
1999年 | 6769篇 |
1998年 | 5690篇 |
1997年 | 5169篇 |
1996年 | 4493篇 |
1995年 | 4281篇 |
1994年 | 3892篇 |
1993年 | 3148篇 |
1992年 | 3039篇 |
1991年 | 2526篇 |
1990年 | 2269篇 |
1989年 | 1981篇 |
1988年 | 1791篇 |
1987年 | 1521篇 |
1985年 | 4353篇 |
1984年 | 5294篇 |
1983年 | 3686篇 |
1982年 | 4214篇 |
1981年 | 3850篇 |
1980年 | 3459篇 |
1979年 | 3142篇 |
1978年 | 2684篇 |
1977年 | 2042篇 |
1976年 | 2288篇 |
1975年 | 1740篇 |
1974年 | 1512篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Sarah A. Taylor Jacqueline Benedetti David Schuller Stephen P. Richman Goronwy O. Broun Alexander Hantel 《Investigational new drugs》1993,11(2-3):227-229
Summary Twenty-two patients with recurrent or metastatic squamous cell carcinoma of the head and neck were treated with piroxantrone 150 mg/m2 intravenously every 21 days. There were no objective responses. The 95% upper confidence bound for response is 15%. Primary toxicity was hematologic. 相似文献
72.
Jay Magaziner Eleanor M. Simonsick T. Michael Kashner J. Richard Hebel 《Journal of clinical epidemiology》1988,41(11)
The present study evaluates the response comparability between 361 elderly hip fracture patients admitted from the community to seven Baltimore area hospitals between 1984 and 1986 and interviewer selected proxies on items pertaining to patients' pre-fracture health and functional status. Agreement across items ranges from very poor to good and varies with respect to the health or functional area assessed. Proxies tend to overestimate patient disability relative to the patients themselves, especially with regard to capacity to perform instrumental activities of daily living. Although proxies who report the greatest contact with patients respond most comparably to the patients, when they do disagree, proxies with the greatest patient contact tend to overestimate patient disability. The authors suggest that attention to item construction and phrasing may improve response comparability. 相似文献
73.
目的 评价单克隆IgH基因重排检测在恶性淋巴瘤 (B NHL)临床中的应用价值。方法 用半巢式PCR检测单克隆IgH基因重排。病例组为B NHL ,包括 6 9例石蜡包埋组织切片、治疗前 16例骨髓和 2 9例外周血、阳性者治疗后复查骨髓和外周血 ;对照组为 10例慢性淋巴结炎、3例T NHL和 2例HD。结果 对照组均阴性。病例组 :切片中单克隆IgH基因重排阳性率为 6 3.8% (44 / 6 9) ;骨髓和外周血阳性率分别为 43 .8%(7/ 16 )和 41.4% (12 / 2 9) ,细胞形态学检查未见异常细胞者阳性率分别为 33 .3% (3/ 9)和 31.3% (5 / 16 )。 16例同时采集骨髓和外周血者 ,阳性率分别为 43 .8% (7/ 16 )和 37.5 % (6 / 16 ) ,两者无统计学差异。治疗前单克隆IgH重排阳性者 ,6例完全缓解 (CR)后转阴 ,处于持续缓解状态 ,1例临床缓解后 13个月仍阳性 ,现在继续随访中 ,另 1例CR后持续阳性者 ,6个月后复发。结论 切片、骨髓和外周血中检测单克隆IgH基因重排可以作为B NHL诊断和随访微小残留病灶的辅助手段 相似文献
74.
对13例体外循环病人进行了观察,发现体外循环后TXB2/6-keto-PGF1α显著增高,表明体外循环使血小板受损,而血小板受损是体外循环后失血的主要原因之一。 相似文献
75.
Health-related quality of life assessed before and during chemotherapy predicts for survival in multiple myeloma 总被引:5,自引:0,他引:5
Measurement of health-related quality of life was integrated into a randomized trial (NMSG 4/90) comparing melphalan/prednisone to melphalan/prednisone + interferon α-2b in newly diagnosed multiple myeloma. One of the aims of the study was to assess the prognostic significance of quality-of-life scores, using the EORTC QLQ-C30 questionnaire. Univariate analysis showed a highly significant association with survival from the start of therapy for physical functioning as well as role and cognitive functioning, global quality of life, fatigue and pain. In multivariate analysis, physical functioning and W.H.O. performance status were independent prognostic factors ( P values=0.001 for both) when analysed in a Cox regression model with the somatic variables β-2 microglobulin, skeletal disease and age. The best prediction for survival from the start of therapy was obtained by combining the β-2 microglobulin and physical functioning scores in a variable consisting of three risk factor levels with an estimated median survival of 17, 29 and 49 months, respectively. At a 12 months landmark analysis, the relative risk for patients with physical functioning score 0–20 v 80–100 was 5.63 (99% CI 2.76–11.49), whereas the relative risk for patients without an objective response to chemotherapy compared to those with at least a minor response was 2.32 (99% CI 1.44–3.74). Quality-of-life assessment may be an independent and valuable addition to the known prognostic factors in multiple myeloma. 相似文献
76.
While the benefits of training manuals can hardly be questioned, they are exceedingly limited in reducing variability attributed to the "therapist factor." We propose that manuals provide a useful outline of the general principles of a therapeutic approach, but can only reduce therapist variability at the expense of other essential therapeutic phenomena. Manuals cannot adequately convey, for example, how the effective therapist functions as a model of adult living and as a person who provides guidance. We suggest that such an experience cannot readily be packaged in manualized form, though manuals may serve as a useful beginning. Recommendations for therapist manualized training include greater attention to the subtleties of human relationships and adequately conveying that any technique is effective only when catalysed by a living, relational process. 相似文献
77.
Rosemary Cant 《Australian Occupational Therapy Journal》1993,40(3):113-121
Newer policies of community care for those with disabilities have resulted in the home becoming the usual site of care. Policy makers must now give attention to the needs of those at home giving this care. This article explores the constraints on sociability opportunities of 73 mothers who were caring for children with disabilities. These opportunities are often built into leisure pursuits for women without caring responsibilities. However, choice of out-of-house leisure activity was circumscribed for the mothers in this study and their reported leisure activities revolved around home and neighbourhood. Even these sites offered limited scope for sociability because of the way in which caring affected domestic space and because of the characteristics of the modern Australian suburb. It is argued in this paper that personal time and personal domestic space are needed by care-givers so their sociability needs can be fulfilled. An understanding of the constraints imposed by use of the home as a place of care may make possible the planning of a rearrangement of domestic space to increase sociability opportunities for carers. 相似文献
78.
心理因素对小学生脑力工作能力影响的研究 总被引:4,自引:2,他引:2
采用横断面研究方法,对180名小学三年级学生脑力工作能力与其智力、性格、学习动机等心理因素和学习、睡眠时间等作息因素的关系进行分析研究。验证了学习、睡眠时间是影响学生脑力工作能力重要的外部因素;脑力工作能力与智力和学习成绩呈正相关。学生自身的心理因素中,学习动机对脑力工作能力有重要影响,所以激发和强化学生的学习动机,是保持和提高学生学习工作能力的有效手段;而性格内外向性、情绪稳定性等因素,对脑力工作能力的影响不明显。 相似文献
79.
A RELIABLE MARKER OF ENDOTHELIAL CELL DYSFUNCTION: DOES IT EXIST? 总被引:19,自引:0,他引:19
80.
Kevin L. Greason M.D. Jose A. Acosta M.D. Thomas J. Magrino M.D. Moogil Choe M.D. 《Diseases of the colon and rectum》1996,39(6):702-704
PURPOSE: This study was undertaken to clarify the importance of bleeding vascular ectasia of the colon as the etiology of massive lower gastrointestinal hemorrhage in patients 40 years of age or younger. METHODS: An otherwise healthy 21-year-old male was admitted to a tertiary medical center with massive lower gastrointestinal hemorrhage. Technetium-labeled red blood cell scan, selective visceral angiography, and colonoscopy identified the source of bleeding as vascular abnormality of the descending colon. Segmental colonic resection was performed. RESULTS: Histologic review of the specimen demonstrated a vascular ectasia. The patient recovered uneventfully and has had no further stigmata of hemorrhage. A review of the literature was undertaken to make clear the significance of vascular ectasia as the source for massive colonic hemorrhage in the young adult. CONCLUSION: This is the first report that documents histologically a vascular ectasia as the source of massive lower gastrointestinal hemorrhage in an otherwise healthy patient less than 40 years of age. Vascular ectasia is an uncommon cause of lower gastrointestinal hemorrhage in the young adult.The Chief, Bureau of Medicine and Surgery, Navy Department, Washington, DC, Clinical Investigation Program sponsored this report #84-16-1968-532, as required by HSETCINST 6000.41A. The views expressed in this article are those of the authors and do not reflect the official policy or position of the Department of the Navy, Department of Defense, or the United States Government. 相似文献