首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   66952篇
  免费   5635篇
  国内免费   177篇
耳鼻咽喉   961篇
儿科学   1757篇
妇产科学   913篇
基础医学   8784篇
口腔科学   1056篇
临床医学   6936篇
内科学   13062篇
皮肤病学   761篇
神经病学   6137篇
特种医学   2463篇
外科学   11976篇
综合类   872篇
现状与发展   1篇
一般理论   82篇
预防医学   6131篇
眼科学   1455篇
药学   4239篇
中国医学   50篇
肿瘤学   5128篇
  2023年   564篇
  2022年   971篇
  2021年   2331篇
  2020年   1228篇
  2019年   1959篇
  2018年   2386篇
  2017年   1695篇
  2016年   1752篇
  2015年   1929篇
  2014年   2775篇
  2013年   3426篇
  2012年   5329篇
  2011年   5199篇
  2010年   2760篇
  2009年   2352篇
  2008年   3822篇
  2007年   4038篇
  2006年   3512篇
  2005年   3250篇
  2004年   2872篇
  2003年   2554篇
  2002年   2259篇
  2001年   922篇
  2000年   894篇
  1999年   837篇
  1998年   513篇
  1997年   443篇
  1996年   378篇
  1995年   331篇
  1994年   322篇
  1993年   275篇
  1992年   640篇
  1991年   558篇
  1990年   520篇
  1989年   542篇
  1988年   473篇
  1987年   466篇
  1986年   432篇
  1985年   423篇
  1984年   356篇
  1983年   291篇
  1982年   237篇
  1981年   236篇
  1980年   187篇
  1979年   307篇
  1978年   277篇
  1975年   199篇
  1974年   272篇
  1973年   212篇
  1972年   217篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
We have discovered an interesting account of sudden death reported in the Liber Eliensis, a Latin compendium of twelfth century happenings in the environs of Ely, the cathedral town found just north of Cambridge in the fenlands of England. The account tells how Gervase, a Norman official of the Sheriff, oppressed the local Saxons. The abbot took the people's part and was summoned before Gervase. However, during the night before the abbot arrived, Gervase dreamed that the local Saxon saint of the shrine, St. Etheldreda, struck him with her staff in the chest. He woke with pain, crying out that St. Etheldreda was about to strike him again, and died.  相似文献   
92.
We demonstrate that a mixture of four recombinant dengue virus E polypeptides corresponding to the N-terminal region of the envelope protein from all serotypes substitutes for standard antigens in two immunoglobulin M enzyme-linked immunosorbent assay formats with 100% concordance, making these polypeptides a useful and accessible reagent for serological diagnosis of dengue in endemic countries.  相似文献   
93.
BACKGROUND: There is no consensus regarding the optimal rate of follow-up in the post-bariatric surgery patient population. METHODS: The records of all patients who underwent laparoscopic Roux-en-Y gastric bypass from 2001 to 2003 were reviewed. Using patient zip codes, travel distances were calculated between the patients' places of residence and our clinic. Patients were then assigned to 1 of 3 cohorts according to the following distances: (1) < 50 miles, (2) 50 to 100 miles, and (3) > 100 miles. Patient compliance with follow-up appointments at 3 weeks, 3 months, 6 months, 9 months, and 12 months was analyzed. Linear trends were identified using the Mantel-Haenszel test. Age and sex were analyzed as possible predictors of compliance using the chi(2) test. P values < .05 were considered statistically significant. RESULTS: The study group comprised 150 patients (127 females and 23 males). The 3 cohorts contained 115, 21, and 14 patients, respectively. All patients in each cohort were compliant with the 3-week follow-up appointment. Although there were differences in compliance between cohorts at each of the remaining appointments, only the 9-month (70.3% vs 61.9% vs 35.7%) visit showed statistical significance (P = .035). The 6-month visit trended toward significance (85.2% vs 76.2% vs 64.3%; P = .088). Males were more likely to be compliant with the 12-month follow-up (P = .040). When controlling for sex, travel distance was also a predictor of compliance at this follow-up visit (P = .024). Age was not predictive of compliance (P = .827). CONCLUSION: Based on our findings, we conclude that travel distance from the clinic does not significantly affect compliance at the initial follow-up, 3-month, and 12-month appointments. However, distance does tend to affect compliance at the 6-month appointment and significantly affects compliance at the 9-month appointment. Males are more likely to be compliant at the 12 month follow-up visit. We must continue to strive for 100% follow-up in our post-bariatric surgery patients.  相似文献   
94.
95.
Unemployment is over three million in Britain, and unemployment is known to be associated with poor health. It has been suggested that health authorities should produce a comprehensive response to the health problems caused by unemployment, and a survey was undertaken to find how many had done so. All the regional and district health authorities in England, the health boards of Wales, Scotland, and Northern Ireland, and the family practitioner committees of England and Wales were asked by letter what they were doing to respond to the health problems of unemployment. A list of suggestions of what they might be doing was enclosed. The overall response rate was 77% (255/331), and 50% (127/255) of the respondents were doing something--33.3% (3/9) of the regional health authorities, 64% (101/158) of the district health authorities and health boards, and 26% (23/88) of the family practitioner committees. The paper describes what they were doing. A relation was sought between the level of unemployment in an area and the extent of the response, and a significant association was found. Half of Britain's health authorities are now responding in some way to the health problems associated with unemployment.  相似文献   
96.
This paper models the proximate determinants of school attendance and scores on cognitive and educational achievement tests and on school examinations of over 600 schoolchildren from the Control group of a randomized trial in Tanzania, where children in the Intervention group heavily infected with hookworm and schistosomiasis received treatment. The modeling approach used a random effects framework and incorporated the inter-relationships between school attendance and performance on various tests, controlling for children's health status, socioeconomic variables, grade level, and the educational infrastructure. The empirical results showed the importance of variables such as children's height and hemoglobin concentration for the scores, especially on educational achievement tests that are easy to implement in developing countries. Also, teacher experience and work assignments were significant predictors of the scores on educational achievement tests, and there was some evidence of multiplicative effects of children's heights and work assignments on the test scores. Lastly, some comparisons were made for changes in test scores of treated children in the Intervention group with the untreated children in the Control group.  相似文献   
97.
CD154-specific antibody therapy prevents allograft rejection in many experimental transplant models. However, initial clinical transplant trials with anti-CD154 have been disappointing suggesting the need for as of yet undetermined adjuvant therapy. In rodents, donor antigen (e.g., a donor blood transfusion), or mTOR inhibition (e.g., sirolimus), enhances anti-CD154's efficacy. We performed renal transplants in major histocompatibility complex-(MHC) mismatched rhesus monkeys and treated recipients with combinations of the CD154-specific antibody IDEC-131, and/or sirolimus, and/or a pre-transplant donor-specific transfusion (DST). Therapy was withdrawn after 3 months. Triple therapy prevented rejection during therapy in all animals and led to operational tolerance in three of five animals including donor-specific skin graft acceptance in the two animals tested. IDEC-131, sirolimus and DST are highly effective in preventing renal allograft rejection in primates. This apparently clinically applicable regimen is promising for human renal transplant trials.  相似文献   
98.
Paramyxovirus-like inclusions in two cases of pycnodysostosis   总被引:1,自引:0,他引:1  
M N Beneton  S Harris  J A Kanis 《BONE》1987,8(4):211-217
We describe the biochemical and histological features of two related patients with pycnodysostosis. Examination of bone biopsies taken from both patients showed the presence of large nonfunctional osteoclasts which contained paramyxovirus-like inclusions similar in size and arrangement to those found in Paget's disease of bone. No radiographic, histologic or biochemical evidence for Paget's disease was found in either patient. The presence of osteoclast inclusions may not be specific for Paget's disease, therefore, and could be the result rather than the cause of abnormal osteoclast metabolism.  相似文献   
99.
Researchers have demonstrated that certain types of pain coping are correlated with less pain severity and disability and that there are differences between Caucasians and African-American pain patients in their use of specific coping strategies. However, the extent to which racial group differences exist in the associations between pain coping strategies and pain severity, interference, and disability is unclear. Furthermore, the role of education in these associations is uncertain. We recruited a diverse community sample of individuals with chronic pain and their spouses to examine this issue (N = 105). Participants completed the Coping Strategies Questionnaire, Multidimensional Pain Inventory, and Sickness Impact Profile. Results showed that African-American participants reported significantly more pain severity, interference, and disability and reported using diverting attention and prayer and hoping pain-coping strategies significantly more often than Caucasian participants; however, only the racial group difference in prayer and hoping remained when controlling for education. We also examined whether race and education interacted with coping strategies in relating to pain and disability. Significant three-way interactions were found for physical and psychosocial disability, suggesting that educational level should be included in analyses exploring racial group differences. The results suggest the need for pain treatments that take into account the educational and cultural context of pain. PERSPECTIVE: This article demonstrates that demographic variables such as race and education should be considered together when evaluating the effectiveness of coping with pain. The findings have the potential to enhance research and clinical practice with diverse groups.  相似文献   
100.
BACKGROUND AND OBJECTIVES: An eight-member group consisting of Canadian infectious disease and immunology specialists and a family physician with significant experience in HIV management was convened to update existing recommendations, specifically intended for use by Canadian HIV-treating physicians, on the appropriate use of enfuvirtide in HIV/AIDS patients with resistance to other antiretroviral drugs. METHODS: Evidence from the literature and expert opinions of the group members formed the basis of the guidelines. Comments on the draft guidelines were obtained from other physicians across Canada with HIV expertise. The final guidelines represent the group's consensus agreement. RESULTS AND CONCLUSIONS: The recommendations were developed to guide physicians in optimal practices in patient selection for enfuvirtide treatment and subsequent patient management. The issues considered include positive predictors of response to enfuvirtide, stage of disease, optimization of the background regimen, early indicators of enfuvirtide response, and patient education and support.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号