全文获取类型
收费全文 | 20023篇 |
免费 | 1241篇 |
国内免费 | 37篇 |
专业分类
耳鼻咽喉 | 152篇 |
儿科学 | 702篇 |
妇产科学 | 709篇 |
基础医学 | 2708篇 |
口腔科学 | 264篇 |
临床医学 | 3334篇 |
内科学 | 3742篇 |
皮肤病学 | 204篇 |
神经病学 | 1995篇 |
特种医学 | 295篇 |
外科学 | 1439篇 |
综合类 | 249篇 |
一般理论 | 31篇 |
预防医学 | 2803篇 |
眼科学 | 154篇 |
药学 | 1165篇 |
中国医学 | 13篇 |
肿瘤学 | 1342篇 |
出版年
2023年 | 89篇 |
2022年 | 161篇 |
2021年 | 334篇 |
2020年 | 213篇 |
2019年 | 378篇 |
2018年 | 389篇 |
2017年 | 281篇 |
2016年 | 355篇 |
2015年 | 411篇 |
2014年 | 603篇 |
2013年 | 970篇 |
2012年 | 1397篇 |
2011年 | 1393篇 |
2010年 | 776篇 |
2009年 | 756篇 |
2008年 | 1361篇 |
2007年 | 1347篇 |
2006年 | 1343篇 |
2005年 | 1375篇 |
2004年 | 1312篇 |
2003年 | 1281篇 |
2002年 | 1244篇 |
2001年 | 165篇 |
2000年 | 138篇 |
1999年 | 177篇 |
1998年 | 251篇 |
1997年 | 220篇 |
1996年 | 182篇 |
1995年 | 192篇 |
1994年 | 169篇 |
1993年 | 164篇 |
1992年 | 138篇 |
1991年 | 118篇 |
1990年 | 111篇 |
1989年 | 113篇 |
1988年 | 108篇 |
1987年 | 110篇 |
1986年 | 80篇 |
1985年 | 84篇 |
1984年 | 118篇 |
1983年 | 89篇 |
1982年 | 125篇 |
1981年 | 104篇 |
1980年 | 106篇 |
1979年 | 58篇 |
1978年 | 65篇 |
1977年 | 43篇 |
1976年 | 49篇 |
1975年 | 30篇 |
1974年 | 39篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
22.
Job ending among youth and adults with severe mental illness 总被引:1,自引:0,他引:1
This study examined job leaving over a 36-month period among 326 persons (74 youth and 252 adults) with severe mental illness who were participating in an urban vocational rehabilitation program. Data from 627 job endings indicated that younger clients displayed job-ending patterns that were different in some aspects from such patterns for nondisabled youth (such as displaying a lower average job tenure) yet similar to job-ending patterns for nonhandicapped youth in other ways (such as displaying a high frequency of job changing). Youth and their adult counterparts with mental illness displayed similar tenure on agency-sponsored placements but significantly different tenure on independent jobs. While adults held their independent jobs for an average of seven months, youth averaged only three months at competitive employment. Youth also were significantly more likely than adults to be fired from both placements and independent jobs. These findings and others are discussed in terms of their implications for development of public policy and service delivery models for providing on-going job support to youth and adults with severe psychiatric disabilities. 相似文献
23.
Judith A. MacNaughton Mohan L. Bangah' Philip I. McCloudt Henry G. Burger 《Clinical endocrinology》1991,35(4):341-346
OBJECTIVE: Normal elderly men are reported to have decreased testicular function despite elevated gonadotrophin levels. We wished therefore to determine if changes in testicular function occur over the age range 19-60 years. DESIGN: Single fasting blood samples were obtained between 0800 and 0900 h. PATIENTS: Working men in a large industrial company between the ages of 19 and 60 years participated in the study. MEASUREMENTS: FSH, serum immunoreactive inhibin and total testosterone were measured, the latter two as measurements of Sertoli and Leydig cell function respectively. RESULTS: The mean baseline serum immunoreactive inhibin level was significantly lower in men from the older age groups, 31-40 years (479 U/l), 41-50 years (439 U/l) and 51-60 years (415 U/l) than in men from the youngest age group, 21-30 years (613 U/l) while serum FSH was higher in men from the older age groups, 41-50 years (3.7 IU/l) and 51-60 years (6.1 IU/l) than in men from the youngest age group, 21-30 years (2.6 IU/l). There appears to be a change in both FSH and inhibin production, consistent with a primary decline in testicular function. There was no significant difference in testosterone levels between the older age group, age 51-60 years and the younger age group, age 21-30 years. However, testosterone levels were significantly lower in the 41-50 year age group, when compared with the 21-30 year, this significance levelling out at about age 45 years. CONCLUSION: The data are consistent with the hypothesis that immunoreactive inhibin reflects inhibin bioactivity, and that inhibin plays a role in the feedback control of FSH secretion in men. 相似文献
24.
25.
Judith S. Wallerstein© 《Perspectives in psychiatric care》1987,24(3-4):107-113
26.
John J Doyle Alfred I Neugut Judith S Jacobson Victor R Grann Dawn L Hershman 《Journal of clinical oncology》2005,23(34):8597-8605
PURPOSE: Adjuvant chemotherapy, especially with anthracyclines, is known to cause acute and chronic cardiotoxicity in breast cancer patients. We studied the cardiac effects of chemotherapy in a population-based sample of breast cancer patients aged > or = 65 years with long-term follow-up. PATIENTS AND METHODS: In the Surveillance, Epidemiology, and End Results (SEER)-Medicare database, we analyzed treatments and outcomes among women > or = 65 years of age who were diagnosed with stage I to III breast cancer from January 1, 1992 to December 31, 1999. Propensity scores were used to control for baseline heart disease (HD) and other known predictors of chemotherapy, and Cox proportional hazards models were used to estimate the risk of cardiomyopathy (CM), congestive heart failure (CHF), and HD after chemotherapy. RESULTS: Of 31,748 women with stage I to III breast cancer, 5,575 (18%) received chemotherapy. Chemotherapy was associated with younger age, fewer comorbidities, hormone receptor negativity, multiple primary tumors, and advanced disease. Patients who received chemotherapy were less likely than other patients to have pre-existing HD (45% v 55%, respectively; P < .001). The hazard ratios for CM, CHF, and HD for patients treated with doxorubicin (DOX) compared with patients who received no chemotherapy were 2.48 (95% CI, 2.10 to 2.93), 1.38 (95% CI, 1.25 to 1.52), and 1.35 (95% CI, 1.26 to 1.44), respectively. The relative risk of cardiotoxicity among patients who received DOX compared with untreated patients remained elevated 5 years after diagnosis. CONCLUSION: When baseline HD was taken into account, chemotherapy, especially with anthracyclines, was associated with a substantially increased risk of CM. As the number of long-term survivors grows, identifying and minimizing the late effects of treatment will become increasingly important. 相似文献
27.
28.
Kelley Withy MD MS ; January May Andaya; Judith S. Mikami RN MPH ; Seiji Yamada MD MPH 《The Journal of rural health》2007,23(1):84-88
CONTEXT: Health disparities between rural and urban communities are well documented. There are many suggested causes and many proposed solutions but no one-size-fits-all answer. The most successful community interventions have been introduced by communities themselves. However, before communities invest in such interventions, each group must identify and prioritize their needs. PURPOSE: This article describes the Hoshin facilitation method as a practical option assisting communities in assessing their needs and gaining consensus for future steps. METHODS: Thirty-four meetings were held in 11 rural communities in Hawaii using the Hoshin process to identify factors that impact rural health. Themes were identified by constant comparative analysis and thematic frequency described. Commonality of responses between communities was examined. Informal feedback was collected from meeting participants. FINDINGS: There was a great deal of commonality between community responses, with economic factors, drug use, lack of community leadership, lack of health care services and access to services, lack of healthy activities for youth, and poor public education being the most common issues noted. Group involvement in the meetings was high, and the facilitation method received positive feedback from participants. CONCLUSIONS: The Hoshin facilitation method is a very useful tool to help communities rapidly identify and prioritize areas for programmatic attention. 相似文献
29.
30.
Oscar A. Alvarez M.D. Judith A. Maples M.D. Fermin O. Tio M.D. Makau Lee M.D. Ph.D. 《The American journal of gastroenterology》1995,90(8):1350-1351
Cokeromyces recurvatus , a sporangiola-forming dimorphic is a rare cause of urogenital infection in humans. We report here a case of severe watery diarrhea due lo C. recurvains , which was treated successfully with high-dose oral nystatin therapy. We speculate that our patient was probably predisposed to infections due to opportunistic organisms, such as C. recurvatus , because of post-transplantation immunosuppression. To our knowledge, our patient represents the first documented case of diarrhea due to C. recurvatus in man und this ease highlights the potential pathogenic capability of this opportunistic organism in immunosuppressed patients. 相似文献