全文获取类型
收费全文 | 419370篇 |
免费 | 27854篇 |
国内免费 | 9094篇 |
专业分类
耳鼻咽喉 | 4715篇 |
儿科学 | 11282篇 |
妇产科学 | 7558篇 |
基础医学 | 30721篇 |
口腔科学 | 12130篇 |
临床医学 | 44956篇 |
内科学 | 52043篇 |
皮肤病学 | 5988篇 |
神经病学 | 24146篇 |
特种医学 | 9830篇 |
外国民族医学 | 51篇 |
外科学 | 44407篇 |
综合类 | 64814篇 |
现状与发展 | 20篇 |
一般理论 | 32篇 |
预防医学 | 41457篇 |
眼科学 | 6672篇 |
药学 | 38746篇 |
537篇 | |
中国医学 | 37299篇 |
肿瘤学 | 18914篇 |
出版年
2024年 | 1351篇 |
2023年 | 6654篇 |
2022年 | 11937篇 |
2021年 | 16311篇 |
2020年 | 15649篇 |
2019年 | 20551篇 |
2018年 | 18180篇 |
2017年 | 15375篇 |
2016年 | 13266篇 |
2015年 | 12445篇 |
2014年 | 25358篇 |
2013年 | 28847篇 |
2012年 | 23713篇 |
2011年 | 25706篇 |
2010年 | 20594篇 |
2009年 | 18544篇 |
2008年 | 17644篇 |
2007年 | 18288篇 |
2006年 | 16007篇 |
2005年 | 13838篇 |
2004年 | 11302篇 |
2003年 | 9911篇 |
2002年 | 7886篇 |
2001年 | 6922篇 |
2000年 | 5768篇 |
1999年 | 4910篇 |
1998年 | 4003篇 |
1997年 | 3792篇 |
1996年 | 3239篇 |
1995年 | 3097篇 |
1994年 | 2920篇 |
1993年 | 2373篇 |
1992年 | 2325篇 |
1991年 | 2020篇 |
1990年 | 1764篇 |
1989年 | 1596篇 |
1988年 | 1505篇 |
1987年 | 1322篇 |
1985年 | 4007篇 |
1984年 | 4964篇 |
1983年 | 3457篇 |
1982年 | 3951篇 |
1981年 | 3665篇 |
1980年 | 3262篇 |
1979年 | 2996篇 |
1978年 | 2586篇 |
1977年 | 1954篇 |
1976年 | 2191篇 |
1975年 | 1664篇 |
1974年 | 1452篇 |
排序方式: 共有10000条查询结果,搜索用时 0 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.
我院自1989年3月至1995年10月手术治疗21例创伤性膈疝,21例疝愈。 发病机理与胸腹腔压力差、腹腔脏器冲击膈肌及胸腔负压有关。同时简要介绍了创伤性膈疝的诊断和治疗。 相似文献
74.
Background: The bariatric patient exists in dynamic relationship with family members and friends who have considerable influence
upon the patient and his or her surgical outcome. When family members and friends behave as intimate saboteurs, they attempt
to hamper, hurt, or subvert the bariatric patient's goal of achieving and maintaining a healthy body weight. Successful or
not, intimate saboteurs provide significant treatment challenges for the patient and the treatment team. Methods and Patients:
Patient profiles provide examples of intimate sabotage. The psychological construct of Family Systems Theory is used as a
plausible explanation for the sabotage of friends and family. Conclusions: Multidisciplinary professionals treating the bariatric
patient must be aware of the critical influence of intimate saboteurs and the tactics they use to sabotage. Treatment guidelines
recommended by Family Systems Theory are presented as strategies to mitigate the influence of intimate saboteurs. 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.
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
77.
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
78.
79.
80.