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   1419篇
  免费   194篇
耳鼻咽喉   9篇
儿科学   36篇
妇产科学   35篇
基础医学   299篇
口腔科学   14篇
临床医学   145篇
内科学   236篇
皮肤病学   36篇
神经病学   123篇
特种医学   31篇
外科学   117篇
综合类   87篇
预防医学   119篇
眼科学   11篇
药学   118篇
中国医学   3篇
肿瘤学   194篇
  2023年   8篇
  2022年   8篇
  2021年   37篇
  2020年   23篇
  2019年   25篇
  2018年   28篇
  2017年   34篇
  2016年   30篇
  2015年   37篇
  2014年   31篇
  2013年   59篇
  2012年   75篇
  2011年   83篇
  2010年   51篇
  2009年   46篇
  2008年   71篇
  2007年   67篇
  2006年   71篇
  2005年   76篇
  2004年   74篇
  2003年   68篇
  2002年   56篇
  2001年   41篇
  2000年   38篇
  1999年   37篇
  1998年   17篇
  1997年   15篇
  1996年   15篇
  1995年   11篇
  1994年   12篇
  1993年   18篇
  1992年   25篇
  1991年   38篇
  1990年   32篇
  1989年   32篇
  1988年   30篇
  1987年   25篇
  1986年   27篇
  1985年   31篇
  1984年   21篇
  1983年   8篇
  1982年   6篇
  1981年   13篇
  1980年   6篇
  1979年   15篇
  1977年   9篇
  1975年   4篇
  1973年   6篇
  1972年   4篇
  1969年   4篇
排序方式: 共有1613条查询结果,搜索用时 31 毫秒
71.
72.
ObjectiveNot-for-profit hospitals are required to meet federal reporting requirements detailing their community benefit activities, which support their tax-exempt status. Children''s hospitals have long provided community injury prevention (IP) programming and thus can inform public health outreach work in other areas. This work describes IP programming as a community service offered by children''s hospitals in the U.S.MethodsThe IP specialist at 232 US-based member institutions of the Children''s Hospital Association were invited to complete an assessment of their hospital''s IP outreach programming.Results47.7 percent of hospitals request financial data from IP programming for tax reporting purposes. Almost all offer injury prevention (IP) services; the majority are in the community (60.3%) and 34.5% are hospital-based. Most IP units are independent (60.3%) and 71.8% are responsible for their own budgets.ConclusionsBy integrating dissemination and implementation sciences and community health needs assessments, these findings can help advance community services provided by hospitals to impact public health.  相似文献   
73.

Aims

Several studies have demonstrated the importance of agonist therapies such as methadone and buprenorphine for preventing relapse for individuals being released from jail or prison to the community. No studies have examined the impact of methadone for increasing the completion of community supervision requirements and preventing opioid relapse for individuals under community corrections supervision. This observational study compared the community corrections completion rate and opioid relapse rate of individuals receiving methadone maintenance therapy (MMT) to individuals who did not.

Methods

Of the 2931 individuals enrolled under criminal justice supervision in the community, Treatment Accountability for Safer Communities (TASC), and who met criteria for opioid dependence, 329 (11%) individuals reported receiving MMT in the community.

Results

The majority of participants were White (79.8%) and male (63.5%), with a mean age of 31.33 years (SD = 9.18), and were under supervision for 10.4 months (SD = 9.1). MMT participants were less likely to fail out of supervision compared to individuals not in MMT (39.0% vs. 52.9%, p < 0.001), and had a lower rate of relapse (32.9%) and longer time to relapse (average days = 89.7, SD = 158.9) compared to the relapse rate (55.9%) and time to relapse (average days = 60.5, SD = 117.9) of those not on MMT.

Conclusions

While the observational nature of this study prevents causal inferences, these results suggest that utilization of MMT in community corrections may increase the likelihood of completing supervision requirements and delay time to opioid relapse. Providing agonist therapies to opioid dependent individuals under supervision appears to be a critical strategy in this important population.  相似文献   
74.
75.
Neonatal Streptococcus agalactiae infections cause significant morbidity and mortality, and antenatal screening is recommended. We compared three U.S. Food and Drug Administration (FDA)-cleared nucleic acid amplification tests (NAATs) to culture using 314 vaginal/rectal swabs after 18 to 24 h (recommended period) and 4 to 8 h (shortened period) of broth enrichment. Agreement of the NAATs with each other was high (97.1% to 98.4%), but culture was less sensitive than all NAATs (67% to 73%). A shortened period of broth culture enrichment resulted in 1 false-negative result in 68 (1.5%). The NAATs performed comparably and were more sensitive than culture.  相似文献   
76.
77.
Although sports nutrition guidelines promote evidence-based practice, it is unclear whether women have been adequately included in the underpinning research. In view of the high usage rates of performance supplements by female athletes, we conducted a standardised audit of the literature supporting evidence-based products: β-alanine, caffeine, creatine, glycerol, nitrate/beetroot juice and sodium bicarbonate. Within 1826 studies totalling 34,889 participants, just 23% of participants were women, although 34% of studies included at least one woman. Across different supplements, 0–8% of studies investigated women exclusively, while fewer (0–2%) were specifically designed to compare sex-based responses. The annual publication of female-specific studies was ~8 times fewer than those investigating exclusively male cohorts. Interestingly, 15% of the female participants were classified as international/world-class athletes, compared with 7% of men. Most studies investigated performance outcomes but displayed poorer representation of women (16% of participants), whereas health-focussed studies had the greatest proportion of female participants (35%). Only 14% of studies including women attempted to define menstrual status, with only three studies (~0.5%) implementing best practice methodologies to assess menstrual status. New research should target the efficacy of performance supplements in female athletes, and future sports nutrition recommendations should specifically consider how well female athletes have contributed to the evidence-base.  相似文献   
78.
We have isolated and characterized 3 monoclonal antibody (Mab) reagents useful in the serological identification of varieties of eastern equine encephalitis (EEE) viruses. These antibodies were specific for the E1 glycoprotein of their homologous viruses. One Mab, 1B5C-3, reacted specifically with all North American (NA) EEE viruses isolated over a 50 year period. This antigenic stability of NA isolates was genetically confirmed by oligonucleotide fingerprinting. Evolutionary stability is a unique feature among alphaviruses. The Mab, 1C1J-4 reacted specifically with 1 South American isolate of EEE virus. A third Mab, 1B1C-4, was EEE virus complex reactive. While none of these antibodies had virus neutralizing activity, the identified reactivities could be demonstrated in the more rapid serological tests of enzyme-linked immunosorbent assay and indirect immunofluorescence.  相似文献   
79.
Dependency associated with depression involves at least two forms of social behavior: (a) needs for nurturance/protection and close attachment, and an inability to function independently and (b) being (de)valued, fear of disapproval, and social status. In many studies, measures of dependency combine these two dimensions. This paper argues that this has led to confusion on the salient dimensions related to depression. It is suggested that behaviors currently regarded as dependent, and linked to depression, are better understood as forms of involuntary subordination that involve judgments of personal inferiority, and submissive-appeasement behavior. This paper presents preliminary evidence that social status, and its associated features of negative self-other comparisons and submissive behavior, may be particularly relevant to depression.  相似文献   
80.
As evidence continues to mount implicating diet in the etiology of disease, the US Navy is developing nutrition education programs designed to reflect the consolidated dietary recommendations of national expert agencies. The purpose of this study was to provide a baseline assessment of the level of nutrition knowledge among Navy personnel. Forty true/false questions were developed to test nutrition knowledge as conveyed by the Navy's instructional manual for nutrition educators. The questionnaire was mailed to a representative sample of all active-duty Navy personnel. Usable questionnaires were received from 2,938 participants (72.7% response rate). Mean number of correct items was 26.1 (65%). Nutrition knowledge was higher among older respondents, more highly educated personnel, whites, officers, women, and overweight individuals. Knowledge was weakest in the areas of calories/food intake and carbohydrates and strongest on vitamins/minerals and fiber. Program managers were recommended to intensify efforts to reach low-scoring subgroups, place more emphasis on the role of complex carbohydrates, disseminate guidelines for using nutrition labels on products, and develop point-of-choice nutrition education interventions for military dining facilities.  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