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   238892篇
  免费   11948篇
  国内免费   408篇
耳鼻咽喉   3120篇
儿科学   7424篇
妇产科学   4809篇
基础医学   34427篇
口腔科学   5729篇
临床医学   18872篇
内科学   52788篇
皮肤病学   6330篇
神经病学   21324篇
特种医学   7216篇
外国民族医学   101篇
外科学   29778篇
综合类   993篇
一般理论   64篇
预防医学   21710篇
眼科学   4695篇
药学   16809篇
中国医学   709篇
肿瘤学   14350篇
  2023年   1300篇
  2022年   881篇
  2021年   3540篇
  2020年   2114篇
  2019年   3969篇
  2018年   7648篇
  2017年   5059篇
  2016年   5039篇
  2015年   5729篇
  2014年   5924篇
  2013年   9560篇
  2012年   16453篇
  2011年   16366篇
  2010年   8225篇
  2009年   6101篇
  2008年   14100篇
  2007年   15031篇
  2006年   13905篇
  2005年   13686篇
  2004年   12847篇
  2003年   11718篇
  2002年   11097篇
  2001年   6203篇
  2000年   6300篇
  1999年   5575篇
  1998年   910篇
  1997年   761篇
  1996年   726篇
  1992年   3212篇
  1991年   2880篇
  1990年   2742篇
  1989年   2509篇
  1988年   2372篇
  1987年   2200篇
  1986年   2096篇
  1985年   1895篇
  1984年   1420篇
  1983年   1203篇
  1982年   700篇
  1979年   1220篇
  1978年   862篇
  1977年   806篇
  1975年   804篇
  1974年   992篇
  1973年   1005篇
  1972年   942篇
  1971年   925篇
  1970年   866篇
  1969年   907篇
  1968年   788篇
排序方式: 共有10000条查询结果,搜索用时 297 毫秒
91.

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   
92.
93.

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   
94.
95.
96.
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   
97.
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