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   244971篇
  免费   12377篇
  国内免费   453篇
耳鼻咽喉   3108篇
儿科学   7521篇
妇产科学   5179篇
基础医学   35562篇
口腔科学   5455篇
临床医学   19631篇
内科学   54334篇
皮肤病学   6299篇
神经病学   21885篇
特种医学   7363篇
外国民族医学   102篇
外科学   30948篇
综合类   1114篇
一般理论   68篇
预防医学   21922篇
眼科学   4657篇
药学   17155篇
中国医学   714篇
肿瘤学   14784篇
  2023年   1264篇
  2022年   910篇
  2021年   3612篇
  2020年   2154篇
  2019年   4072篇
  2018年   7661篇
  2017年   5006篇
  2016年   5039篇
  2015年   5681篇
  2014年   5995篇
  2013年   9653篇
  2012年   16640篇
  2011年   16685篇
  2010年   8441篇
  2009年   6441篇
  2008年   14468篇
  2007年   15440篇
  2006年   14291篇
  2005年   14188篇
  2004年   13298篇
  2003年   12186篇
  2002年   11574篇
  2001年   6260篇
  2000年   6332篇
  1999年   5671篇
  1998年   1126篇
  1997年   952篇
  1996年   868篇
  1995年   820篇
  1992年   3321篇
  1991年   2963篇
  1990年   2813篇
  1989年   2572篇
  1988年   2437篇
  1987年   2251篇
  1986年   2154篇
  1985年   1925篇
  1984年   1460篇
  1983年   1238篇
  1979年   1242篇
  1978年   883篇
  1977年   821篇
  1975年   827篇
  1974年   1004篇
  1973年   1013篇
  1972年   947篇
  1971年   936篇
  1970年   873篇
  1969年   914篇
  1968年   796篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
91.
92.

Background

Inflammation and infections have been associated with prostate cancer progression. We assessed whether elevated serum cytokines or T. vaginalis seropositivity at the time of diagnosis was associated with higher grade or lethal prostate cancer.

Patients and Methods

Men with localized or metastatic prostate cancer were included in this study. Cytokine serum levels including interleukin (IL)-1α, IL-1β, IL-2, IL-6, IL-8, monocyte chemotactic protein 1 (CCL-2), tumor necrosis factor α, and growth-regulated oncogene α (CXCL-1) using a multiplex enzyme-linked immunosorbent assay and T. vaginalis serology were measured in blood samples at diagnosis.

Results

A total of 324 patients were identified at time of localized disease and 118 at time of metastatic disease. Of the 189 patients with localized disease and clinical follow-up data (median, 73 months), 28 developed lethal disease. There was no association between circulating cytokine levels above median concentrations nor T. vaginalis seropositivity and risk of intermediate- to high-risk or lethal prostate cancer.

Conclusion

Higher levels of serum cytokine levels and T. vaginalis seropositivity at diagnosis are not associated with high-grade or lethal prostate cancer and do not aid risk stratification of localized prostate cancer.  相似文献   
93.
94.

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   
95.
96.
97.
IntroductionPeople with Down syndrome (DS) have high respiratory morbidity, evaluating their respiratory health with standardized, objective tests is desirable. Thus, the objective of this study was to evaluate the technical quality of Pulmonary Function Tests (PFTs) to determine which ones are most suitable for this population.MethodsParticipants included children, teenagers and adults with DS, 5 years of age or older (n = 302). The technical quality of the impulse oscillometry system (IOS), forced spirometry, lung-diffusing capacity for carbon monoxide (DLCO), and 6-min walk test (6MWT) were analyzed by age group. Capnography and pulse oximetry were included in the study. Technical quality was determined on the basis of current international PFTs standards.ResultsFifty-one percent of participants were males. A total of 184 participants (71%) who completed the IOS fulfilled the quality criteria, while 210 (70%) completed the 6MWT. Performance on forced spirometry and DLCO was poor. All pulse oximetries and 96% percent heart rates obtained had good quality, but exhaled carbon dioxide (PetCO2) and respiratory rate (RR) showed deficient repeatability.ConclusionsIOS appears to be the most reliable instrument for evaluating lung mechanics in individuals with DS.  相似文献   
98.
99.
100.
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