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   1876473篇
  免费   134105篇
  国内免费   4320篇
耳鼻咽喉   24655篇
儿科学   62026篇
妇产科学   50980篇
基础医学   267278篇
口腔科学   53800篇
临床医学   166223篇
内科学   367949篇
皮肤病学   43380篇
神经病学   148709篇
特种医学   72704篇
外国民族医学   266篇
外科学   285543篇
综合类   40019篇
现状与发展   4篇
一般理论   578篇
预防医学   134069篇
眼科学   44738篇
药学   136205篇
  7篇
中国医学   4841篇
肿瘤学   110924篇
  2021年   15432篇
  2019年   15902篇
  2018年   23778篇
  2017年   18227篇
  2016年   20533篇
  2015年   23404篇
  2014年   31260篇
  2013年   44830篇
  2012年   63136篇
  2011年   65405篇
  2010年   38451篇
  2009年   35474篇
  2008年   60860篇
  2007年   64734篇
  2006年   64983篇
  2005年   62587篇
  2004年   60030篇
  2003年   57168篇
  2002年   55015篇
  2001年   96261篇
  2000年   98091篇
  1999年   81081篇
  1998年   21266篇
  1997年   18545篇
  1996年   18343篇
  1995年   17549篇
  1994年   16052篇
  1993年   14751篇
  1992年   59347篇
  1991年   57221篇
  1990年   54907篇
  1989年   52558篇
  1988年   47730篇
  1987年   46520篇
  1986年   43729篇
  1985年   41414篇
  1984年   30516篇
  1983年   25843篇
  1982年   14556篇
  1979年   26757篇
  1978年   18492篇
  1977年   15688篇
  1976年   14539篇
  1975年   15551篇
  1974年   18650篇
  1973年   17871篇
  1972年   16600篇
  1971年   15368篇
  1970年   14228篇
  1969年   13280篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
201.
202.
203.
Abstract

This study is a single-center, retrospective analysis of postmenopausal women presenting with dyspareunia and vulvar pain, aiming to evaluate relative effectiveness of vestibular CO2 laser therapy as a treatment. Three monthly sessions of laser were performed to each patient and thereafter a three-months follow-up was stablished. A total number of 72 patients undergoing vestibular laser treatment were recruited from patient files in the period between 2016 and 2018. Among these, 39 women also received a concomitant treatment with ospemifene (60?mg/day) during the study period. There was a statistically significant reduction of all the symptoms in both groups up to the three month follow-up. Regarding dryness and dyspareunia, the relief tent to be more prominent in the ospemifene?+?laser group at all follow-ups and remained statistically significant at three-month follow-up. Specifically, vestibular dryness was significantly lower in the ospemifene?+?laser group compared with the laser treatment group (?87% vs???34%, respectively), and the vestibular health score started declining faster in the ospemifene?+?laser group. Although, additional research is needed to understand the mechanism of action, our data shows that a combination regimen of laser and ospemifene may improve clinical effectiveness for long-term treatment of symptoms associated with the under-recognized genitourinary syndrome of menopause.  相似文献   
204.
205.
Platelet α-granules release growth factors (GFs) that promote healing and tissue regeneration. Platelet-rich plasma (PRP) is shown to be beneficial in treating alopecia, and however, clinical response can be inconsistent. Due to several fold enrichment of platelets secreting large quantities of GFs following PRP injections, heterogeneity in amounts of GFs secreted by platelets may contribute to inconsistent clinical responses. Herein, we evaluated factors that could potentially contribute to heterogeneous secretion of GFs by platelets. We measured platelet secretion of transforming growth factor beta1 (TGFβ1), platelet-derived growth factor (PDGF-BB), epidermal growth factor (EGF), vascular endothelial growth factor (VEGF) and fibroblast growth factor (FGF2) in aliquots of de-identified PRP samples from female patients undergoing therapy in the hair disease clinic. Although secretion of GFs by platelets was comparable in PRP samples of patients with non-cicatricial and cicatricial alopecia, a Shapiro-Wilk test for normal distribution indicated significant variability across all patient samples. The amount of GF secreted by platelets was comparable when PRP prepared from two FDA-cleared devices with distinct techniques were compared. We provide evidence of platelets secreting heterogeneous amounts of GFs within each sample as high and low secretion of random factors could be simultaneously detected. These results suggest inherent heterogeneity in secretion of GFs by platelets in patient samples that are not influenced by the device used to prepare PRP. Since some GFs could have antagonistic effects on hair growth, a balance between amounts of growth promoting and inhibiting factors may be crucial in determining clinical response to PRP therapy.  相似文献   
206.
207.
208.

Introduction The focus in clinical pharmacy practice is and has for the last 30–35 years been on changing the role of pharmacy staff into service orientation and patient counselling. One way of doing this is by involving staff in change process and as a researcher to take part in the change process by establishing partnerships with staff. On the background of the authors’ widespread action research (AR)-based experiences, recommendations and comments for how to conduct an AR-study is described, and one of their AR-based studies illustrate the methodology and the research methods used. Methodology AR is defined as an approach to research which is based on a problem-solving relationship between researchers and clients, which aims at both solving a problem and at collaboratively generating new knowledge. Research questions relevant in AR-studies are: what was the working process in this change oriented study? What learning and/or changes took place? What challenges/pitfalls had to be overcome? What were the influence/consequences for the involved parts? When to use If you want to implement new services and want to involve staff and others in the process, an AR methodology is very suitable. The basic advantages of doing AR-based studies are grounded in their participatory and democratic basis and their starting point in problems experienced in practice. Limitations Some of the limitations in AR-studies are that neither of the participants in a project steering group are the only ones to decide. Furthermore, the collective process makes the decision-making procedures relatively complex.

  相似文献   
209.
210.
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