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   22101篇
  免费   1096篇
  国内免费   331篇
耳鼻咽喉   97篇
儿科学   465篇
妇产科学   814篇
基础医学   960篇
口腔科学   478篇
临床医学   6673篇
内科学   3201篇
皮肤病学   335篇
神经病学   981篇
特种医学   1224篇
外科学   1368篇
综合类   3659篇
现状与发展   1篇
预防医学   841篇
眼科学   465篇
药学   1173篇
  10篇
中国医学   506篇
肿瘤学   277篇
  2024年   9篇
  2023年   171篇
  2022年   242篇
  2021年   376篇
  2020年   469篇
  2019年   394篇
  2018年   447篇
  2017年   453篇
  2016年   521篇
  2015年   517篇
  2014年   1183篇
  2013年   1236篇
  2012年   1217篇
  2011年   1394篇
  2010年   1188篇
  2009年   1137篇
  2008年   1206篇
  2007年   1278篇
  2006年   1265篇
  2005年   1184篇
  2004年   1011篇
  2003年   804篇
  2002年   725篇
  2001年   721篇
  2000年   599篇
  1999年   527篇
  1998年   397篇
  1997年   401篇
  1996年   380篇
  1995年   351篇
  1994年   289篇
  1993年   246篇
  1992年   214篇
  1991年   187篇
  1990年   141篇
  1989年   89篇
  1988年   89篇
  1987年   74篇
  1986年   66篇
  1985年   86篇
  1984年   53篇
  1983年   36篇
  1982年   45篇
  1981年   26篇
  1980年   11篇
  1979年   16篇
  1978年   13篇
  1977年   12篇
  1976年   18篇
  1974年   4篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
The representation of nursing faculty of color is disproportionate to that in the general population, despite recruitment and retention strategies. Boosting the presence of nursing faculty of color requires an understanding of factors that undermine diversity initiatives and calls for the adoption of innovative practices. This article addresses the importance of racial and ethnic diversity within nursing education. Furthermore, it examines the factors that prevent the recruitment and retention of a racially and ethnically diverse nursing faculty workforce and provides evidence-based recommendations for increasing diversity among nursing faculty and nursing organizations.  相似文献   
2.
3.
BackgroundIn shoulder arthroplasty, bone resorption around the stem can lead to stem loosening and makes surgery difficult at the time of revision. Proximal bone resorption after reverse shoulder arthroplasty can cause instability because of a decrease of deltoid wrapping effect. As factors of the stem itself, such as stem coating, shape, length, and use of bone cement, may also affect bone resorption, a single-stem model should be used to compare bone resorptions between different pathologies and surgical procedures. However, to date, a few reports have compared these differences in detail using a single-stem model. Therefore, we investigated the prevalence and location of humeral bone resorption in a single-stem model.MethodsThe study included 100 shoulders that underwent anatomical total shoulder arthroplasty (TSA) or humeral head replacement (HHR) with a single uncemented humeral stem from 2008 to 2018. The patients were 31 men and 69 women. The mean age at surgery was 72.9 years (range, 41-86 years). The patients were divided into three groups: especially, 25, 61, and 14 shoulders received TSA for primary osteoarthritis without rotator cuff tears (TSA group), HHR using an anatomical head with rotator cuff repair for cuff tear arthropathy (CTA) (HHR group), and HHR using a CTA head without rotator cuff repair (CTA group), respectively. Patients were monitored for a mean of 56 months (range, 12-98 months). The location of bone resorption was divided into seven zones as follows: zone 1, greater tuberosity; zone 2, lateral diaphysis; zone 3, lateral diaphysis beyond the deltoid tuberosity; zone 4, tip of the stem; zone 5, medial diaphysis beyond the deltoid tuberosity; zone 6, medial diaphysis; and zone 7, calcar region. The degree of bone resorption was classified from grade 0 to 4.ResultsBone resorption of grade 3 or higher was significantly more frequent at the greater tuberosity in the HHR and CTA groups (P < .001 and P < .001, respectively) than that in the TSA group. Grade 4 bone resorption was significantly more frequent in the CTA than that in the TSA and HHR groups in zone 1 (P = .016 and P = .041, respectively).ConclusionThe state of attachment of the rotator cuff to the greater tuberosity might affect bone resorption at the greater tuberosity, such as the greater tuberosity after shoulder arthroplasty. In cases of shoulder arthroplasty for arthropathy with rotator cuff tear, performing rotator cuff repair might prevent bone resorption.Level of evidenceLevel IV; Prognosis Study  相似文献   
4.
5.
6.
7.
8.
9.
10.

Introduction

Congenital colour vision deficiencies affect 8% of the male and 0.5% of the female population. The study of colour vision is a complex process due to several factors: the psychophysics of vision itself, the difficulty to establish mathematical models for its analysis, the vague correlation of results between different tests, and the influence of external factors such as lighting, the tests condition, or the experience of the examiner and the patient. In the present document, a simplified review was carried out on the main colour vision tests available in clinical practice.

Material and methods

Once a filtered preliminary review was made of the bibliography related to the study of colour vision using the PubMed search tool, the most used tests in clinical practice were selected according to their frequency of use and the purpose for which they were applied. A bibliographic study was then carried out on each particular test according to the design of the shown stimuli, its target population, and its sensitivity and specificity.

Results

From the 95 publications found using the PubMed search tool, in 41 of them, colour tests were used by researchers in their methodology. From the 64 colour tests used, 19 of them were different (with 4 of them being different tests adapted by research groups, and 2 of them carried out online).The most used tests were the following: Ishihara test (10.88%), Farnsworth-Munsell (7.04%), Farnsworth-Munsell 100 Hue (6.4%), Cambridge Colour Test (3.84%), Hardy-Rand-Rittler (3.2%), tests developed by the groups (2.56%), the Anomaloscope (1.28%), the online tests (1.28%) and, finally, Colour Assessment and Diagnosis (0.64%), Pflüger Trident Colour Plates (0.64%), Toothguide Training Box (0.64%), Lanthony Desaturated D-15 (0.64%), City University Test (0.64%), Universal Colour Discrimination Test (0.64%), and Rabin Cone Contrast Test (0.64%).

Conclusions

The Anomaloscope is the “gold standard” in terms of colour vision testing, despite its incompatibility with daily clinical practice. It is fairly complex to use, difficult to understand for children, and its practice requires having the time available. Nevertheless, it is possible to reach an accurate approximation through the combination of some of the tests listed in this article. The above mentioned tests are a good alternative to determine the presence of dyschromatopsia in settings closer to daily clinical practice or in less controlled settings than a clinical study. The major drawback among the wide range of tests available for the study of colour vision is the difficulty to compare results between tests, since units of the reported data are usually different, and experience is required for its correct interpretation. Currently, there is no consensus on which colour test is the most complete. It is, therefore, advisable to use at least 2 tests in order to ensure diagnoses, and have more extensive information about the visual perception of patients.  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