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   740449篇
  免费   38621篇
  国内免费   849篇
耳鼻咽喉   9517篇
儿科学   23508篇
妇产科学   16908篇
基础医学   122768篇
口腔科学   17394篇
临床医学   65199篇
内科学   141525篇
皮肤病学   17536篇
神经病学   53002篇
特种医学   26176篇
外国民族医学   152篇
外科学   104504篇
综合类   8499篇
现状与发展   2篇
一般理论   168篇
预防医学   58016篇
眼科学   15967篇
药学   56387篇
  1篇
中国医学   1698篇
肿瘤学   40992篇
  2021年   6633篇
  2019年   7483篇
  2018年   12560篇
  2017年   8638篇
  2016年   9360篇
  2015年   10366篇
  2014年   12357篇
  2013年   18904篇
  2012年   30299篇
  2011年   32114篇
  2010年   17297篇
  2009年   14308篇
  2008年   28406篇
  2007年   30967篇
  2006年   29376篇
  2005年   28592篇
  2004年   27407篇
  2003年   25768篇
  2002年   24713篇
  2001年   27690篇
  2000年   28216篇
  1999年   23593篇
  1998年   5767篇
  1997年   4748篇
  1996年   4754篇
  1995年   4699篇
  1992年   17262篇
  1991年   18415篇
  1990年   18431篇
  1989年   17916篇
  1988年   16461篇
  1987年   16224篇
  1986年   15095篇
  1985年   14434篇
  1984年   10674篇
  1983年   9100篇
  1982年   4784篇
  1979年   10051篇
  1978年   7147篇
  1977年   5856篇
  1976年   6077篇
  1975年   7346篇
  1974年   8332篇
  1973年   8062篇
  1972年   7449篇
  1971年   7155篇
  1970年   6655篇
  1969年   6298篇
  1968年   5898篇
  1967年   5244篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
We describe two cases of acute‐onset erythema, peeling, and pruritus or tenderness isolated to the palmar surface of the hands. A detailed exposure history revealed significant periods of contact with homemade slime; given the clinical findings and timing of exposure, acute contact dermatitis of the hands was suspected. Symptoms and clinical findings resolved after avoidance of the suspected causative contactants. There are few if any reported cases of contact dermatitis to homemade slime in the literature; this serves to highlight the importance of a thorough exposure history in the evaluation of hand dermatitis.  相似文献   
82.
83.
Bulletin of Environmental Contamination and Toxicology - This work describes the development of an analytical protocol combining cleanup by liquid–solid extraction and GC–MS for the...  相似文献   
84.

Introduction

Kimura disease (KD) is a chronic lymphoproliferative disorder of unknown etiology that affects the skin and lymph nodes, mostly observed in males of Asian descent. The natural history of asymptomatic epiglottal KD remains unknown. This rare site of KD is often only diagnosed when tumor growth starts to obstruct the upper airways.

Observation

A 34-year-old North African male presented with fatigue and multiple, slowly progressive, fluctuating skin nodules in the right mandibular and retroauricular regions. Computed tomography of the head and neck revealed a large soft tissue tumor close to the right mandibular body and unexpected thickening of the epiglottis. Transnasal laryngoscopy confirmed the CT findings and showed thickening of the epiglottis. The diagnosis of KD was based on histological examination of biopsy specimens taken from the right mandibular tumor, a cervical lymph node, and the epiglottis.

Discussion

Most cases of KD with epiglottal involvement present with dysphonia and dysphagia. No consensus guidelines are available concerning the complementary investigations that should be performed. This case report raises the question of whether patients with suspected KD should be systematically screened for lesions in unusual and potentially dangerous anatomic sites.  相似文献   
85.
ObjectivesTo present the 2017 Clinical Practice Guidelines of the French Society of Otorhinolaryngology concerning the role of the ENT specialist in the diagnosis of pediatric obstructive sleep apnea-hypopnea syndrome. This article focuses specifically on medical history and physical examination.MethodsA multidisciplinary work-group drew up a first version of the guidelines, graded according to level of evidence following the GRADE grading system. The final version was obtained by including the suggestions and comments from the editorial group.ResultsAt the end of the process, guidelines were established and graded regarding the following points: interview and analysis of the various interview scores recommended in the literature; clinical examination with awake upper-airway endoscopy; and indications for referral to non-ENT specialists.  相似文献   
86.
87.

Background

Pump speed optimization in patients implanted with a ventricular assist device represents a major challenge during the follow-up period. We present our findings on whether combined invasive hemodynamic ramp tests and cardiopulmonary exercise testing (CPX) can help optimize patient management.

Methods

Eighteen patients implanted with a HeartMate 3 (HM3) device underwent ramp tests with right heart catheterization (including central venous pressure [CVP], pulmonary artery pressure, pulmonary capillary wedge pressure [PCWP], and blood pressure) and echocardiography. Data were recorded at up to 4 speed settings. Speed changes were in steps of 200 revolutions/min (rpm). Evaluation of functional capacity by CPX was conducted according to the modified Bruce protocol.

Results

Only 30% of patients had normal PCWPs at their original rpm settings. In going from lowest to highest speeds, cardiac output improved by 0.25 ± 0.35 L/min/step (total change, 1.28 ± 0.3 L/min), and PCWP decreased by 1.9 ± 0.73 mm Hg/step (total change, 6 ± 1.6 mm Hg). CVP and systolic blood pressure did not change significantly with rpm. The rpm assessment was adjusted based on test results to achieve CVPs and PCWPs as close to normal limits as possible, which was feasible in all patients. On CPX, all patients demonstrated good performance (peak VO2, 16.8 ± 3.5 mL/kg/min).

Conclusion

Hemodynamic ramp testing provides an objective means of optimizing rpm, and has the potential to provide good exercise tolerance.  相似文献   
88.
Background: Community mobility (CM) is considered a part of community reintegration that enhances Quality of Life (QoL). Achieving an appropriate gait speed is essential in attaining an independent outdoor ambulation and satisfactory CM.

Objective: The aim of this study was to identify whether gait speed is a predictor of CM and QoL in patients with stroke following a multimodal rehabilitation program (MRP).

Methods: This was a baseline control trial with 6-months follow-up in an outpatient rehabilitation setting at a university hospital. Twenty-six stroke survivors completed the MRP (24 sessions, 2 days/wk, 1 hr/session). The MRP consisted of aerobic exercise, task-oriented exercises, balance exercises and stretching. Participants also performed an ambulation program at home. Outcome variables were: walking speed (10-m walking test) and QoL (physical and psychosocial domains of Euroquol and Sickness Impact Profile).

Results: At the end of the intervention, comfortable and fast walking speed increased by an average of 0.16 (SD 0.21) (*p < .05) and 0.40 (SD 0.51) (**p < .001) m/s, respectively. After the intervention, all participants achieved independent outdoor ambulation with an increase of 34.14 of walking minutes/day in the community and a decrease of sitting time of 95.45 minutes/day. Regarding QoL there were increased mean scores on the physical and psychosocial dimensions of Euroquol and the Sickness Impact Profile, respectively (**p < .001).

Conclusions: The results suggest that improved walking speed after the MRP is associated with CM and higher scores in QoL. These findings support the need to implement rehabilitation programs to promote increased speed.  相似文献   

89.
90.
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