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   46771篇
  免费   3361篇
  国内免费   190篇
耳鼻咽喉   375篇
儿科学   1509篇
妇产科学   1200篇
基础医学   6584篇
口腔科学   590篇
临床医学   5033篇
内科学   9800篇
皮肤病学   876篇
神经病学   5542篇
特种医学   1123篇
外科学   4166篇
综合类   380篇
一般理论   58篇
预防医学   5666篇
眼科学   617篇
药学   2975篇
中国医学   86篇
肿瘤学   3742篇
  2024年   59篇
  2023年   651篇
  2022年   1086篇
  2021年   2143篇
  2020年   1297篇
  2019年   1778篇
  2018年   2038篇
  2017年   1362篇
  2016年   1517篇
  2015年   1660篇
  2014年   2025篇
  2013年   2625篇
  2012年   4201篇
  2011年   4151篇
  2010年   2107篇
  2009年   1854篇
  2008年   2944篇
  2007年   2915篇
  2006年   2782篇
  2005年   2574篇
  2004年   2285篇
  2003年   2037篇
  2002年   1734篇
  2001年   194篇
  2000年   146篇
  1999年   211篇
  1998年   348篇
  1997年   260篇
  1996年   213篇
  1995年   175篇
  1994年   124篇
  1993年   117篇
  1992年   69篇
  1991年   67篇
  1990年   56篇
  1989年   56篇
  1988年   49篇
  1987年   37篇
  1986年   39篇
  1985年   34篇
  1984年   46篇
  1983年   45篇
  1982年   33篇
  1981年   41篇
  1980年   28篇
  1979年   17篇
  1978年   13篇
  1977年   20篇
  1975年   9篇
  1973年   8篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
BIBLIOTHERAPY     
Bibliotherapy is the use of literature to help heal. It can be an effective intervention for nurse-midwives to use with clients. Presented is a discussion of how to do bibliotherapy and an annotated bibliography of resources.  相似文献   
32.
PURPOSE: The purpose of the study was to evaluate the incidence of incontinence pad use among patients admitted to medical wards, the reasons why nurses decide to use an incontinence pad, the extent to which the use of pads is avoidable, and the outcome of inappropriate pad use after discharge from the hospital. METHODS: A prospective cohort study was conducted; patients admitted to medical wards were observed during hospitalization and a 7-day follow-up period after discharge. SUBJECTS AND SETTING: The study was conducted in 2 acute-care units in Northern Italy. All new patients admitted to the units were recruited. RESULTS: At the time of admission to the hospital, in addition to the 120 patients who already used incontinence pads, there was a 34% incidence of new cases (98/286). The most frequent reason why nurses decided to use this aid was incontinence caused by space-time disorientation, followed by limited mobility, incontinence, patient request, nursing shortage, and involuntary urine leakage not perceived by patient. Seventy patients out of 208 used incontinence pads unnecessarily for a total of 544 days. CONCLUSIONS: Decisions about the use of the incontinence pads are not always consistent with research-based or literature-based suggestions. Nurses should develop clinical guidelines or protocols for the appropriate use of incontinence pads.  相似文献   
33.
Evidence based guidelines for medical nutrition therapy (MNT) in chronic kidney disease (CKD) recommend a range of caloric levels, dependent on age and level of kidney function. Recent literature has explored whether current research findings still support these earlier conclusions, and if new energy determinations for CKD are warranted. This review will take a brief look at the history of the controversy, examine the research evidence at the time of practice guideline development, investigate emerging research, and discuss implications for additional scientific inquiry.  相似文献   
34.
35.
36.
We report the results of a retrospective review of the outpatient pretransplantation workup for United Network for Organ Sharing (UNOS) 3 patients adopted at a liver transplantation (LT) center and illustrate the efficiency indicators used for quality evaluation and cost-analysis. A single-center, pre-LT evaluation workup was performed on an outpatient basis at a cost per patient evaluation of 2,770 Euros (). Objective measures were: the number of patients admitted to and excluded from each phase of the algorithm; the rate of patients admitted to pre-LT evaluation out of the total of referred patients (the referral efficiency rate); the rate of waitlisted patients out of those admitted to pre-LT evaluation (the evaluation efficiency rate); the rate of waitlisted patients out of those referred for LT (the process efficiency rate); and the cost per waitlisted patient, as the ratio of the cost per patient evaluation to the evaluation efficiency rate. From January 1, 1996, to October 1, 2004, 1,837 patients were referred for LT on an outpatient basis. Based on preemptive evaluation of the available clinical data, 412 patients (22.4%) were excluded from pre-LT evaluation and 1,425 (77.6%) were admitted to preliminary consultation. Among these, 603 (42.3%) were excluded from and 822 (57.7%) were admitted to pre-LT evaluation with a referral efficiency rate of 44.7% (822 of 1,837). Out of the patients evaluated for LT, 484 were waitlisted with a cost-utility and evaluation efficiency rate of 58.8% each (484 of 822). Of the 1,837 patients originally addressed for LT 484 were waitlisted, yielding a process efficiency rate of 26.3% (484 of 1,837) and a cost per waitlisted patient of 4,710.8. In conclusion, the 3 indicators allowed monitoring of the efficiency of the pre-LT evaluation algorithm. The current process efficiency rate at our center is low (26.3%), but avoiding early referrals we might increase it to 31.6%, with a 12% net saving on costs per waitlisted patient (from 4,710.8 to 4,165.4).  相似文献   
37.
The aim of this study was to evaluate corneal innervation in soft contact lens wearers using the Tomey Confoscan confocal microscope (40x/0.75 objective lens). Three distinct age- and sex-matched subject groups were involved, including extended soft (hydrogel and silicone-hydrogel) contact lens wearers, overnight soft (hydrogel) contact lens wearers, and non contact lens wearers. A number of variables were objectively measured, subjectively evaluated, or graded in order to investigate the distribution and morphology of corneal nerves. For most of the evaluated parameters, no statistically significant differences were found. However, qualitative observations showed noticeable differences in corneal nerve appearance among the different subject groups; the degree of corneal oedema was suggested as the main causative factor. In conclusion, neither the short-term (overnight wear) nor the long-term (12-month extended wear) soft contact lens wear appeared to affect the morphology and/or distribution of corneal nerves as viewed with confocal microscopy.  相似文献   
38.
39.
40.
The effects of quercetin on viability and proliferation of Chinese Hamster Ovary (CHO) cells and CHO cells overexpressing human quinone reductase (CHO+NQO1) were studied to investigate the involvement of the pro-oxidant quinone chemistry of quercetin. The toxicity of menadione was significantly reduced in CHO+NQO1 cells compared to wild-type CHO cells, validating the NQO1-overexpression in the CHO+NQO1 transfectant. Quercetin inhibited the proliferation of wild-type CHO and CHO+NQO1 cells to a similar extent without affecting cell viability, indicating that NQO1 enrichment of CHO cells did not provide increased protection. On the other hand, inhibition of NQO1 in both types of cells by dicoumarol significantly potentiated the inhibitory effect of quercetin on cell proliferation, revealing the role of NQO1 in cellular protection against quercetin. Altogether, these results can be explained by the hypothesis that both wild-type CHO and CHO+NQO1 cells contain sufficient NQO1 activity for optimal protection against the pro-oxidant effect of quercetin on cell proliferation. The results also point at a cellular NQO1 threshold for optimal protection against quercetin. This NQO1 threshold seems to be in the range of NQO1 activities already present in various tissues.  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