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   628994篇
  免费   39217篇
  国内免费   870篇
耳鼻咽喉   8745篇
儿科学   20289篇
妇产科学   16025篇
基础医学   100639篇
口腔科学   18649篇
临床医学   51495篇
内科学   122356篇
皮肤病学   15837篇
神经病学   45280篇
特种医学   20978篇
外国民族医学   64篇
外科学   91266篇
综合类   9095篇
一般理论   154篇
预防医学   50315篇
眼科学   14712篇
药学   48534篇
中国医学   1599篇
肿瘤学   33049篇
  2021年   5441篇
  2019年   6107篇
  2018年   9522篇
  2017年   6339篇
  2016年   6571篇
  2015年   7318篇
  2014年   9234篇
  2013年   14352篇
  2012年   21469篇
  2011年   23366篇
  2010年   12840篇
  2009年   10907篇
  2008年   20891篇
  2007年   22488篇
  2006年   22018篇
  2005年   21404篇
  2004年   20296篇
  2003年   19208篇
  2002年   18749篇
  2001年   27259篇
  2000年   28755篇
  1999年   23302篇
  1998年   5857篇
  1997年   4979篇
  1996年   5294篇
  1995年   4840篇
  1992年   16787篇
  1991年   17205篇
  1990年   17221篇
  1989年   16456篇
  1988年   15124篇
  1987年   14978篇
  1986年   14124篇
  1985年   13437篇
  1984年   9957篇
  1983年   8514篇
  1982年   4690篇
  1979年   9716篇
  1978年   7035篇
  1977年   5948篇
  1976年   5787篇
  1975年   6629篇
  1974年   7910篇
  1973年   7442篇
  1972年   7230篇
  1971年   6971篇
  1970年   6446篇
  1969年   6160篇
  1968年   5803篇
  1967年   5232篇
排序方式: 共有10000条查询结果,搜索用时 250 毫秒
121.
122.
123.
124.
Annals of Hematology - This study assessed treatment patterns and healthcare resource utilization (HRU) of patients with severe aplastic anemia (SAA) with insufficient response to immunosuppressive...  相似文献   
125.
126.

Objective

The teaching hospital of Nancy, France, implemented a specific multidisciplinary care pathway (French acronym AMDPL) to improve the management of patients presenting with Lyme borreliosis (LB) suspicion. We aimed to assess the first year of activity of this care pathway.

Patients and methods

We included all patients managed in the AMDPL pathway from November 1, 2016 to October 31, 2017. The first step was a dedicated Lyme disease consultation with an infectious disease specialist. Following this consultation, the LB diagnosis was either confirmed and adequate treatment was prescribed, or a differential diagnosis was established and patients received adequate management, or further investigations were required and patients were offered multidisciplinary management as part of a day hospitalization.

Results

A total of 468 patients were included. LB diagnosis was confirmed in 15% of patients (69/468), 49% of patients received a differential diagnosis, and 26% (122/468) of patients had the LB diagnosis ruled out without receiving any other diagnosis.

Conclusions

This is to our knowledge the first multidisciplinary center implemented in France for the management of patients presenting with LB suspicion related to polymorphous signs and symptoms. Several diagnoses could be confirmed or corrected, although some symptoms and complaints could not be explained. This cohort could improve our knowledge of LB and its differential diagnoses.  相似文献   
127.
The amphibian micronucleus test has been widely used during the last 30 years to test the genotoxic properties of several chemicals and as a tool for ecogenotoxic monitoring. The vast majority of these studies were performed on peripheral blood of urodelan larvae and anuran tadpoles and to a lesser extent adults were also used. In this study, we developed protocols for measuring micronuclei in adult shed skin cells and larval gill cells of the Italian crested newt (Triturus carnifex). Amphibians were collected from ponds in two protected areas in Italy that differed in their radon content. Twenty‐three adult newts and 31 larvae were captured from the radon‐rich pond, while 20 adults and 27 larvae were taken from the radon‐free site. The animals were brought to the laboratory and the micronucleus test was performed on peripheral blood and shed skins taken from the adults and on larval gills. Samples from the radon‐rich site showed micronucleus frequencies higher than those from the radon‐free site and the difference was statistically significant in gill cells (P < 0.00001). Moreover, the larval gills seem to be more sensitive than the adult tissues. This method represents an easy (and noninvasive in the case of the shed skin) application of the micronucleus assay that can be useful for environmental studies in situ. Environ. Mol. Mutagen. 56:412–417, 2015. © 2014 Wiley Periodicals, Inc.  相似文献   
128.

Aim

The purpose of this study is to find out whether telephone referral from Primary Health Care to Internal Medicine Consult manages to reduce waiting days as compared to traditional referral. This study also aims to know how acceptable is the telephone referral to general practitioners and their patients.

Design

No blind randomized controlled clinical trial.

Setting

Northern Huelva Health District.

Participants

154 patients.

Interventions

Patients referrals from intervention clinicians were sent via telephone consultation, whereas patients referrals from control clinicians were sent by traditional via.

Measurements

Number of days from referral request to Internal Medicine Consult. Number of telephone and traditional referrals. Number of doctors and patients denied. Denial reasons.

Results

A statistically significant difference was found between groups, with an average of 27 (21-34) days. Among General Practitioners, 8 of the first 58 total doctors after randomization and, subsequently, 6 of the 20 doctors of the test group refused to engage in the trial because they considered “excessive time and effort consuming”. 50% of patients referred by the 14 General Practitioners finally randomized to the intervention group were denied referral by telephone due to patient's complexity.

Conclusions

Telephone referral significantly reduces waiting days for Internal Medicine consult. This type of referral did not mean an “excessive time and effort consuming” to General Practitioners and was not all that beneficial to complex patients  相似文献   
129.
130.
Monatsschrift Kinderheilkunde - Fusionen und Übernahmen in der Pharmaindustrie haben zu einer Konzentration geführt, von der auch die Impfstoffproduktion mit nur noch wenigen global...  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