全文获取类型
收费全文 | 810篇 |
免费 | 36篇 |
国内免费 | 2篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 18篇 |
妇产科学 | 18篇 |
基础医学 | 55篇 |
口腔科学 | 3篇 |
临床医学 | 43篇 |
内科学 | 214篇 |
皮肤病学 | 7篇 |
神经病学 | 8篇 |
特种医学 | 1篇 |
外科学 | 14篇 |
综合类 | 19篇 |
预防医学 | 354篇 |
眼科学 | 1篇 |
药学 | 82篇 |
肿瘤学 | 9篇 |
出版年
2024年 | 1篇 |
2023年 | 25篇 |
2022年 | 13篇 |
2021年 | 29篇 |
2020年 | 73篇 |
2019年 | 43篇 |
2018年 | 60篇 |
2017年 | 52篇 |
2016年 | 53篇 |
2015年 | 59篇 |
2014年 | 86篇 |
2013年 | 77篇 |
2012年 | 30篇 |
2011年 | 31篇 |
2010年 | 48篇 |
2009年 | 49篇 |
2008年 | 14篇 |
2007年 | 20篇 |
2006年 | 8篇 |
2005年 | 6篇 |
2004年 | 6篇 |
2003年 | 6篇 |
2002年 | 14篇 |
2001年 | 7篇 |
2000年 | 3篇 |
1999年 | 8篇 |
1998年 | 4篇 |
1997年 | 2篇 |
1996年 | 5篇 |
1995年 | 3篇 |
1994年 | 4篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
排序方式: 共有848条查询结果,搜索用时 31 毫秒
41.
Albert Garcia Shambavi Subbarao Guoqing Zhang Linda Parsons John Nkengasong Chin-Yih Ou Dennis Ellenberger 《Journal of clinical microbiology》2014,52(3):773-780
A voluntary, cost-free external quality assessment (EQA) program established by the U.S. Centers for Disease Control and Prevention (CDC) was implemented to primarily monitor the performance of laboratories conducting HIV Early Infant Diagnosis (EID) from dried blood spots (DBS) in low- to middle-income countries since 2006. Ten blind DBS proficiency test (PT) specimens and 100 known HIV-positive and -negative DBS specimens (to be used as internal controls) were shipped triannually to participating laboratories with reports for the PT specimens due within 30 days. The participant''s results and a summary of the performance of all participating laboratories and each diagnostic method were provided after each test cycle. Enrollment in the CDC PT program expanded progressively from 17 laboratories from 11 countries in 2006 to include 136 laboratories from 41 countries at the end of 2012. Despite external pressures to test and treat more children while expanding EID programs, mean PT test scores significantly improved over time as demonstrated by the upward trend from mid-2006 to the end of 2012 (P = 0.001) and the increase in the percentage of laboratories scoring 100% (P = 0.003). The mean test scores plateaued over the past 10 testing cycles, ranging between 98.2% and 99.7%, and discordant test results still occur but at a rate of no higher than 2.6%. Analysis of these test results suggests a positive impact of proficiency testing on the testing performance of the participating laboratories, and a continuous training program and proficiency testing participation may translate into laboratories improving their testing accuracy. 相似文献
42.
《Academic pediatrics》2014,14(5):517-525
BackgroundEducation in Quality Improvement for Pediatric Practice (EQIPP) is an online program designed to improve evidence-based care delivery by teaching front-line clinicians quality improvement (QI) skills. Our objective was to evaluate EQIPP data to characterize 1) participant enrollment, use patterns, and demographics; 2) changes in performance in clinical QI measures from baseline to follow-up measurement; and 3) participant experience.MethodsWe conducted an observational study of EQIPP participants utilizing 1 of 3 modules (asthma, immunizations, gastroesophageal reflux disease) from 2009 to 2013. Enrollment and use, demographic, and quality measure data were extracted directly from the EQIPP system; participant experience was assessed via an optional online survey.ResultsStudy participants (n = 3501) were diverse in their gender, age, and race; most were board certified. Significant quality gaps were observed across many of the quality measures at baseline; sizable improvements were observed across most quality measures at follow-up. Participants were generally satisfied with their experience. The most influential module elements were collecting and analyzing data, creating and implementing aim statements and improvement plans, and completing “QI Basics.”ConclusionsOnline educational programs, such as EQIPP, hold promise for front-line clinicians to learn QI. The sustainability of the observed improvements in care processes and their linkage to improvements in health outcomes are unknown and are an essential topic for future study. 相似文献
43.
Aldehyde dehydrogenase (ALDH) enzymes catalyze the NAD(P)+-dependent oxidation of a wide variety of endogenous and exogenous aldehydes to their corresponding acids. Some members of the ALDH superfamily of enzymes are abundantly expressed in the mammalian cornea and lens in a taxon-specific manner. Considered to be corneal and lens crystallins, they confer protective and transparent properties upon these ocular tissues. ALDH3A1 is highly expressed in the cornea of most mammals, with the exception of rabbit that expresses exclusively ALDH1A1 in the cornea. ALDH1A1 is present in both the cornea and lens of several animal species. As a result of their catalytic and non-catalytic functions, ALDH3A1 and ALDH1A1 proteins protect inner ocular tissues from ultraviolet radiation and reactive oxygen-induced damage. In addition, these corneal crystallins contribute to cellular transparency in corneal stromal keratocytes, supporting a structural role of these ALDH proteins. A putative regulatory function of ALDH3A1 on corneal cell proliferation has also been proposed. Finally, the three retinaldehyde dehydrogenases cooperatively mediate retinoic acid signaling during the eye development. 相似文献
44.
We aimed to explore the prevalence of and risk factors for depressive symptoms (DS) among people living with HIV/AIDS (PLWHA) receiving antiretroviral treatment (ART) in Wuhan, Hubei, China. A cross-sectional study evaluating adult PLWHA receiving ART in nine designated clinical hospitals was conducted from October to December 2015. The validated Beck Depression Inventory (BDI) was used to assess DS in eligible participants. Socio-demographical, epidemiological and clinical data were directly extracted from the case reporting database of the China HIV/AIDS Information Network. Multinomial regression analysis was used to explore the risk factors for DS. 394 participants were finally included in all analyses. 40.3% were found to have DS with 13.7% having mild DS and 26.6% having moderate to severe DS. The results of multinomial regression analysis suggested that being married or living with a partner, recent experience of ART-related side effects, and/or history of HCV infection were positively associated with mild DS, while increasing age was positively associated with moderate to severe DS. 相似文献
45.
Joris J. van Hoof Nico Van Der Lely Selma H. Bouthoorn Wim E. Van Dalen Rob R. Pereira 《The Journal of adolescent health》2011,48(2):212-214
PurposeTo monitor the prevalence of, and the circumstances leading to, adolescent alcohol intoxication admissions in Dutch hospital departments of pediatrics.MethodsData were collected in 2007 and 2008, using the Dutch Pediatric Surveillance System, in which pediatricians received questionnaires on varying issues, including adolescent alcohol intoxication admissions.ResultsThe adolescents treated in 2008, as in 2007, were average youth across proportion of gender, educational level, school performances, family structure, siblings, familiarity with medical or aid agencies, alcohol use, and other (illicit) drug use. In 2008, 13% more adolescents were treated. These adolescents showed a trend of having a younger average age, higher blood alcohol concentrations, and longer durations of mental impairment. About 45% of the adolescents who were treated for alcohol intoxication had purchased alcohol from a commercial place, despite that 51 times the specific adolescent had not reached the legal age of 16 years old. About one-third of the youngsters consumed alcohol at home or at a friend's home.ConclusionsThe number of adolescents suffering from alcohol intoxication increased in 2008 compared with 2007. Parental (lack of) involvement and responsibilities of commercial sales personnel are discussed. 相似文献
46.
The purpose of this pilot study was to develop a mentoring program for the promotion of sexual health among Korean adolescents and to explore the effects of the program. A nonequivalent control group pre-test–post-test design was used. The mentoring intervention was conducted by eight nursing students who participated in the program as mentors using various methods such as formal group sessions and informal individual contacts. At the 12-week post-intervention, the interaction between time and group was statistically significant on both sexual knowledge and sexual attitude of the 17 adolescent mentees. The mentoring program demonstrated potential as a developmentally appropriate intervention for the sexual health promotion of adolescents and promises to enable nursing students to gain confidence in their professional capability. 相似文献
47.
BackgroundIn China, western blot (WB) is the recommended procedure for the diagnosis of HIV infection. However, this technique is time consuming and labor intensive, and its complexity restricts wide application in resource-limited regions.ObjectiveThe aim of this study was to evaluate the efficacy of a dry blood spots (DBS)–urine paired enzyme-linked immunosorbent assay (ELISA) test, instead of WB, for HIV antibody detection.Study designPlasma, DBS, and urine samples were collected from 1213 subjects from different populations. Two diagnostic testing strategies were conducted in parallel. The equivalence of the paired ELISA and WB strategies was assessed.ResultsA diagnosis of HIV was determined in 250 subjects according to the paired ELISA test, and in 249 according to the WB strategy. The discordant case was judged HIV-positive during follow-up. In total, 18 subjects were diagnosed with possible HIV using the paired ELISA test, among whom, 11 subjects tested negative with WB, and one was confirmed to be HIV-positive during follow-up. For the remaining 945 subjects, both strategies indicated a negative result. The kappa test indicated good conformity (kappa = 0.954) between the two diagnostic strategies.ConclusionThe DBS–urine paired ELISA could be applied as an alternative to WB in HIV diagnosis, which would be valuable in resource-limited regions owing to the associated affordability and ease of use. 相似文献
48.
Deborah Cragun Rheanna N. Ata Rita D. DeBate J. Kevin Thompson 《Journal of nutrition education and behavior》2013,45(5):450-454
ObjectiveTo examine gender differences in unhealthy weight-control behaviors (UWCB) and identify key psychosocial and demographic correlates of UWCB among sixth-graders.MethodsA cross-sectional survey was completed by 146 boys and 153 girls at a middle school. Secondary data analyses included bivariate tests and multivariable logistic regression.ResultsForty-seven percent of participants reported 1 or more UWCB, with no differences by gender (P = .75). Factors common to boys and girls included: lower global self-esteem; lower body-esteem; and greater negative parental modeling among participants who engaged in UWCB compared to those who did not. However, multivariable models revealed gender differences. Among boys, body mass index, negative parental modeling, and global self-esteem retained statistically significant associations with UWCB after controlling for other variables in the model, whereas race and weight-related body-esteem remained significant for girls.Conclusions and ImplicationsThis research highlights the need for gender-specific UWCB prevention programs implemented in late childhood and early adolescence. 相似文献
49.
Joseph Vyankandondera Kirstin Mitchell Brenda Asiimwe-Kateera Kimberly Boer Philippe Mutwa Jean-Paul Balinda 《AIDS care》2013,25(12):1504-1512
Rwanda has achieved high enrollment into antiretroviral therapy (ART) programs but data on adherence after enrollment are not routinely collected. We used a mixed-methods approach (standardized questionnaires, pill counts, focus group discussions, and in-depth interviews) to determine levels of and barriers to ART adherence from the perspective of both patients and healthcare workers (HCW). Data were available from 213 patients throughout the first year on ART; 58 of them and 23 HCW participated in a qualitative sub-study. Self-reported adherence was high (96% of patients reporting more than 95% adherence), but adherence by pill count was significantly lower, especially in the first 3 months. In the standardized interviews, patients mostly reported that they “simply forgot” or “were away from home” as reasons for nonadherence. The qualitative research identified three interrelated constructs that appeared to negatively influence adherence: stigma, difficulty coming to terms with illness, and concealment of illness. Both standardized questionnaires and the qualitative research identified poverty, disruption to daily routines, factors related to regimen complexity and side effects, and service-related factors as barriers to adherence. We conclude that regular triangulation of different sources of adherence data is desirable to arrive at more realistic estimates. We propose that program monitoring and evaluation cycles incorporate more in-depth research to better understand concerns underlying reasons for nonadherence reported in routine monitoring. 相似文献
50.