全文获取类型
收费全文 | 1367275篇 |
免费 | 101585篇 |
国内免费 | 4602篇 |
专业分类
耳鼻咽喉 | 17329篇 |
儿科学 | 43901篇 |
妇产科学 | 36803篇 |
基础医学 | 203131篇 |
口腔科学 | 36752篇 |
临床医学 | 132087篇 |
内科学 | 264014篇 |
皮肤病学 | 27649篇 |
神经病学 | 114143篇 |
特种医学 | 50365篇 |
外国民族医学 | 367篇 |
外科学 | 187922篇 |
综合类 | 28917篇 |
现状与发展 | 1篇 |
一般理论 | 464篇 |
预防医学 | 115803篇 |
眼科学 | 29530篇 |
药学 | 102013篇 |
6篇 | |
中国医学 | 3607篇 |
肿瘤学 | 78658篇 |
出版年
2021年 | 12092篇 |
2019年 | 12399篇 |
2018年 | 17233篇 |
2017年 | 13043篇 |
2016年 | 14351篇 |
2015年 | 16665篇 |
2014年 | 22525篇 |
2013年 | 34028篇 |
2012年 | 47187篇 |
2011年 | 49777篇 |
2010年 | 28734篇 |
2009年 | 26382篇 |
2008年 | 44698篇 |
2007年 | 46848篇 |
2006年 | 46789篇 |
2005年 | 45073篇 |
2004年 | 42684篇 |
2003年 | 40467篇 |
2002年 | 39155篇 |
2001年 | 61547篇 |
2000年 | 63151篇 |
1999年 | 52731篇 |
1998年 | 14768篇 |
1997年 | 13395篇 |
1996年 | 13216篇 |
1995年 | 12523篇 |
1994年 | 11707篇 |
1993年 | 10985篇 |
1992年 | 41691篇 |
1991年 | 40885篇 |
1990年 | 39589篇 |
1989年 | 37451篇 |
1988年 | 34684篇 |
1987年 | 33783篇 |
1986年 | 32224篇 |
1985年 | 30693篇 |
1984年 | 23071篇 |
1983年 | 19621篇 |
1982年 | 11775篇 |
1979年 | 20822篇 |
1978年 | 14833篇 |
1977年 | 12083篇 |
1976年 | 11884篇 |
1975年 | 12127篇 |
1974年 | 14813篇 |
1973年 | 14485篇 |
1972年 | 13368篇 |
1971年 | 12429篇 |
1970年 | 11506篇 |
1969年 | 10415篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
Moderate sedatives have been increasingly used to improve patient comfort during flexible bronchoscopy (FB). However, routine use of moderate sedation during FB is controversial because its efficacy and safety are not well established.This study aims to evaluate the efficacy and safety of moderate sedation during FB.A search was made of Medline, EMBASE, and the Cochrane Library to May 2014.Randomized controlled trials (RCTs) and quasi-RCTs were included.The main analysis was designed to examine the efficacy of moderate sedation during FB in sedation than no-sedation.The willingness to repeat FB was significantly more in sedation than no-sedation (odds ratio [OR] 2.30; 95% confidence interval [CI] 1.11–4.73; P = 0.02; I2 = 22.5). The duration of FB was shorter in sedation group than no-sedation group (standardized mean difference [SMD] −0.21; 95% CI −0.38 to −0.03; P = 0.02; I2 = 78.3%). Event of hypoxia was not significantly different between sedation and no-sedation groups (OR 0.86; 95% CI 0.42–1.73; P = 0.67; I2 = 0%). The SpO2 during procedure was not different between sedation and no-sedation groups (SMD −0.14; 95% CI −0.37 to 0.08; P = 0.21; I2 = 49.9%). However, in subgroup analysis without supplemental oxygen, the SpO2 was significantly lower in sedation than no-sedation group (SMD −0.45; 95% CI −0.78 to −0.11; P = 0.01; I2 = 0.0%).According to this meta-analysis, moderate sedation in FB would be useful in patients who will require repeated bronchoscopies as well as safe in respiratory depression. To our knowledge, although the various sedative drugs are already used in the real field, this analysis was the first attempt to quantify objective results. We anticipate more definite and studies designed to elucidate standardized outcomes for moderate sedation in FB. 相似文献
4.
5.
Vasundhara Sridharan Yuichi Shoda Jaimee L. Heffner Jonathan Bricker 《Substance use & misuse》2019,54(7):1086-1095
Background: Lay belief systems about the malleability of human attributes have been shown to impact behavior change in multiple domains. Addiction mindset—i.e., beliefs about the permanence (vs. malleability) of addiction — may affect cigarette smokers’ ability to quit, but this has never been examined. Objectives: The aims of the present research were to develop a measure of addiction mindset (study 1) and examine its associations with various psychological aspects of quitting smoking (study 2). Methods: In Study 1, using factor analysis of current smokers’ and nonsmokers’ (n?=?600) responses to 22 items designed to measure addiction mindset, we developed a reliable six-item Addiction Mindset Scale (AMS). In Study 2, adult smokers (n?=?200) completed the AMS, and measures of a number of psychological processes related to smoking. Results: Higher scores on the AMS, indicative of the belief that addiction is malleable (referred to as a growth mindset), were positively and significantly associated with greater motivation to quit, greater commitment to quitting, greater self-efficacy to abstain, less attribution of failure to lack of ability to change addiction, and fewer self-reported barriers to cessation (all p’s < .05). Conclusions: The results of this study show a relationship between the beliefs about the permanence of addiction and psychological processes relevant to quitting smoking. The findings underscore the potential of future research exploring how addiction mindsets relate to successful smoking cessation as well as other types of addictive behavior and how they can be applied to change people’s behavior. 相似文献
6.
Stepanova E. S. Makarenkova L. M. Chistyakov V. V. Rybakov Yu. L. Gukasov V. M. Fedotcheva T. A. Parshin V. A. Votyakov V. A. Shimanovskii N. L. 《Pharmaceutical Chemistry Journal》2019,52(12):1016-1020
Pharmaceutical Chemistry Journal - An HPLC-MS method for simultaneous quantitative determination of a novel gestagenic pharmaceutical and two of its metabolites in rat and rabbit blood sera was... 相似文献
7.
8.
9.