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   10998篇
  免费   700篇
  国内免费   52篇
耳鼻咽喉   302篇
儿科学   273篇
妇产科学   299篇
基础医学   1550篇
口腔科学   419篇
临床医学   908篇
内科学   2570篇
皮肤病学   202篇
神经病学   1254篇
特种医学   220篇
外科学   1004篇
综合类   21篇
一般理论   5篇
预防医学   644篇
眼科学   132篇
药学   689篇
中国医学   36篇
肿瘤学   1222篇
  2024年   19篇
  2023年   116篇
  2022年   274篇
  2021年   420篇
  2020年   268篇
  2019年   316篇
  2018年   349篇
  2017年   288篇
  2016年   347篇
  2015年   369篇
  2014年   494篇
  2013年   601篇
  2012年   924篇
  2011年   1036篇
  2010年   513篇
  2009年   448篇
  2008年   783篇
  2007年   712篇
  2006年   639篇
  2005年   666篇
  2004年   599篇
  2003年   545篇
  2002年   479篇
  2001年   55篇
  2000年   33篇
  1999年   50篇
  1998年   87篇
  1997年   59篇
  1996年   43篇
  1995年   46篇
  1994年   33篇
  1993年   32篇
  1992年   19篇
  1991年   10篇
  1990年   7篇
  1989年   12篇
  1988年   7篇
  1987年   2篇
  1986年   13篇
  1985年   3篇
  1984年   5篇
  1983年   4篇
  1982年   5篇
  1980年   5篇
  1979年   2篇
  1978年   2篇
  1976年   3篇
  1974年   2篇
  1973年   2篇
  1968年   1篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.

Purpose  

In view of the positive outcome of orthodontic treatment using rapid maxillary expansion (RME) on sleep-disordered breathing, we generated data on RME in children with obstructive sleep apnea (OSA) by evaluating objective and subjective data over a 36-month follow-up period, to determine whether RME is effective in the long-term treatment of OSA. We selected all patients with dental malocclusions and OSA syndrome (OSAS) confirmed by polysomnography.  相似文献   
142.
143.
The objective of this study was to explore the therapeutic limitations experienced by a panel of special‐care dentists in France when treating patients with sustained limitations of their decision‐making abilities. We used a Delphi technique conducted in three rounds from 01 June 2014 to 30 September 2015. A first questionnaire comprising open‐ended questions was addressed to 72 panellists. A content analysis of the returned questionnaires served to draft a second questionnaire comprising closed‐ended questions; this was sent to the 28 panellists who responded in the first round. A third questionnaire was sent to the 20 panellists who responded in the second round to give them an opportunity to reconsider their response in the context of the second‐round response group. Sixteen panellists answered the last round. A large majority agreed on the importance of providing comprehensive care, but they encountered obstacles at two time points: (i) when proposing the care; and (ii) when setting it up. The panel put forward recommendations in two main areas: (i) the training of those involved in oral health decisions; and (ii) dental care management and organization of the care system. The study provided a foundation for building future orientations in health care for patients with limited decision‐making abilities.  相似文献   
144.
145.
Idiopathic Pulmonary Fibrosis (IPF) is a chronic, progressive, fibrosing interstitial pneumonia associated with the histologic and/or radiologic pattern of usual interstitial pneumonia (UIP). Nowadays, the high‐resolution computed tomography pattern of “definite UIP” is enough to define a diagnosis of UIP without histological proof. This is pivotal especially in elderly patients with comorbidities. Early recognition of IPF is relevant for its prognostic implication. Some pharmacological strategies have been proposing novel molecules that tend to slow lung function decline, even though without healing fibrosis. We report a case of ex‐heavy smoker male with IPF showing clinical and radiological improvement after 11 months of treatment with Pirfenidone. The definite diagnosis was challenging and it was reached by a multidisciplinary approach.  相似文献   
146.
Platelet release by megakaryocytes is regulated by a concert of environmental and autocrine factors. We previously showed that constitutively released adenosine diphosphate by human megakaryocytes leads to platelet production. Here we show that adenosine diphosphate elicits, in human megakaryocytes, an increase in cytosolic calcium concentration, followed by a plateau, which is lowered in the absence of extracellular calcium, suggesting the involvement of Store-Operated Calcium Entry. Indeed, we demonstrate that megakaryocytes express the major candidates to mediate Store-Operated Calcium Entry, stromal interaction molecule 1, Orai1 and canonical transient receptor potential 1, which are activated upon either pharmacological or physiological depletion of the intracellular calcium pool. This mechanism is inhibited by phospholipase C or inositol-3-phosphate receptor inhibitors and by a specific calcium entry blocker. Studies on megakaryocyte behavior, on extracellular matrix proteins that support proplatelet extension, show that calcium mobilization from intracellular stores activates signaling cascades that trigger megakaryocyte adhesion and proplatelet formation, and promotes extracellular calcium entry which is primarily involved in the regulation of the contractile force responsible for megakaryocyte motility. These findings provide the first evidence that both calcium mobilization from intracellular stores and extracellular calcium entry specifically regulate human megakaryocyte functions.  相似文献   
147.
The use of bowel ultrasonography (US) for the evaluation of gut diseases has increased in recent years and has been proven to provide a widely available, non-invasive and inexpensive method for the initial work-up and follow-up of different intestinal diseases, limited mostly by technical challenges posed by the patient's anatomy. The present review aims to provide an extensive overview of the main pathologic features at US examination of intestinal diseases other than inflammatory bowel disease, both acute (e.g., acute appendicitis, colonic diverticulitis, infectious diseases and ischemic conditions) and chronic (e.g., celiac disease, cystic fibrosis and other enterocolites). The identification of typical US features may help in the diagnostic process and guide the treatment approach. Therefore, the application of knowledge of the US appearance of gastrointestinal diseases is of relevance in enabling greater diagnostic performance and better patient management.  相似文献   
148.
149.
ObjectivesThe aim of this clinical trial was to evaluate efficacy (BE) and tooth sensitivity (TS) of in-office bleaching with a 35% hydrogen peroxide (HP) in patients with aesthetic restorations.MethodsHydrogen peroxide 35% was applied in two sessions, of three 15 min applications, in 15 patients with upper anterior sound teeth (S) and 15 with aesthetic restorations (R). The colour was recorded at baseline, one week and 6 months after treatment completion. Patients recorded TS on a 0–4 scale. The BE was evaluated by two-way ANOVA and Tukey's tests (α = 0.05). The percentage of patients with TS was evaluated by Fisher's exact test and TS intensity of treatments was compared with Mann–Whitney U-test (α = 0.05).ResultsAll participants experienced TS at least once during treatment. Higher TS intensity was observed in R (1.5 [1/1.75]) compared to S (0.5 [0/1.25]) during the bleaching (p < 0.05). S and R demonstrated similar tooth colour enhancement compared to baseline (p < 0.05) and both presented colour stability after 6 months of evaluation (p > 0.05).ConclusionsThe in-office bleaching with 35% HP was effective in patients with aesthetic restorations, however, a higher intensity of TS was observed during the bleaching protocol.Clinical relevanceIn-office dental bleaching can be performed in patients with adhesive restorations promoting satisfactory results; however, it can promote higher intensity of sensitivity compared to patients with sound teeth.  相似文献   
150.
The uniportal-video assisted thoracic surgery (VATS) technique comprises operations which can be performed with skin incisions ranging from 2 to 8 cm and the manifest result of the introduction of the uniportal lobectomy had made possible to increase rapidly the number of published papers on this subject. Many of the large ensuing literature report incomplete historical information on uniportal VATS, and doubts exist about the indication of uniportal VATS for some thoracic oncologic pathologies. Known limitations have been overcome. On the other hand, the modern thoracic surgical team includes one surgeon, one assistant and a scrub nurse, and it is clear that the new generation of thoracic surgeons need to use the “less” used hand. The new technology which permitted the introduction of the uniportal VATS could influence the future need of thoracic surgeons worldwide.  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