全文获取类型
收费全文 | 1371篇 |
免费 | 70篇 |
国内免费 | 33篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 39篇 |
妇产科学 | 21篇 |
基础医学 | 149篇 |
口腔科学 | 24篇 |
临床医学 | 177篇 |
内科学 | 242篇 |
皮肤病学 | 48篇 |
神经病学 | 90篇 |
特种医学 | 82篇 |
外科学 | 153篇 |
综合类 | 38篇 |
预防医学 | 170篇 |
眼科学 | 20篇 |
药学 | 136篇 |
中国医学 | 2篇 |
肿瘤学 | 76篇 |
出版年
2023年 | 5篇 |
2022年 | 8篇 |
2021年 | 28篇 |
2020年 | 10篇 |
2019年 | 18篇 |
2018年 | 23篇 |
2017年 | 13篇 |
2016年 | 23篇 |
2015年 | 24篇 |
2014年 | 38篇 |
2013年 | 55篇 |
2012年 | 62篇 |
2011年 | 71篇 |
2010年 | 34篇 |
2009年 | 42篇 |
2008年 | 60篇 |
2007年 | 92篇 |
2006年 | 72篇 |
2005年 | 49篇 |
2004年 | 62篇 |
2003年 | 53篇 |
2002年 | 46篇 |
2001年 | 41篇 |
2000年 | 43篇 |
1999年 | 42篇 |
1998年 | 26篇 |
1997年 | 26篇 |
1996年 | 35篇 |
1995年 | 24篇 |
1994年 | 32篇 |
1993年 | 8篇 |
1992年 | 25篇 |
1991年 | 28篇 |
1990年 | 34篇 |
1989年 | 25篇 |
1988年 | 24篇 |
1987年 | 17篇 |
1986年 | 18篇 |
1985年 | 17篇 |
1984年 | 17篇 |
1983年 | 6篇 |
1982年 | 9篇 |
1981年 | 8篇 |
1979年 | 13篇 |
1978年 | 10篇 |
1977年 | 15篇 |
1976年 | 4篇 |
1975年 | 8篇 |
1972年 | 6篇 |
1970年 | 4篇 |
排序方式: 共有1474条查询结果,搜索用时 31 毫秒
101.
Integrating smoking cessation into routine public prenatal care: the Smoking Cessation in Pregnancy project. 总被引:21,自引:11,他引:10 下载免费PDF全文
J S Kendrick S C Zahniser N Miller N Salas J Stine P M Gargiullo R L Floyd F W Spierto M Sexton R W Metzger et al. 《American journal of public health》1995,85(2):217-222
OBJECTIVES. In 1986, the state health departments of Colorado, Maryland, and Missouri conducted a federally-funded demonstration project to increase smoking cessation among pregnant women receiving prenatal care and services from the Women, Infants, and Children (WIC) program in public clinics. METHODS. Low-intensity interventions were designed to be integrated into routine prenatal care. Clinics were randomly assigned to intervention or control status; pregnant smokers filled out questionnaires and gave urine specimens at enrollment, in the eighth month of pregnancy, and postpartum. Urine cotinine concentrations were determined at CDC by enzyme-linked immunosorbent assay and were used to verify self-reported smoking status. RESULTS. At the eighth month of pregnancy, self-reported quitting was higher for intervention clinics than control clinics in all three states. However, the cotinine-verified quit rates were not significantly different. CONCLUSIONS. Biochemical verification of self-reported quitting is essential to the evaluation of smoking cessation interventions. Achieving changes in smoking behavior in pregnant women with low-intensity interventions is difficult. 相似文献
102.
Antisense technology provides outstanding promise for treatment of human disease, having broad applicability and high specificity. Although advances have been made in antisense oligonucleotide chemistry, leading to increased plasma and cellular stability, and decreased toxicity, considerable potential remains for the enhancement of oligonucleotide uptake for targeted delivery of oligonucleotides. One promising avenue for achieving this is via linkage of antisense oligonucleotides to peptide carriers. This review looks at the current status of developments in this area. 相似文献
103.
Tobias M Turley M Paul S Sexton K 《Australian and New Zealand journal of public health》2005,29(5):405-411
OBJECTIVE: To estimate the prevalence of established risk factors for ischaemic heart disease (IHD) in New Zealand adults and compare the prevalence in adults with and without this disease. DESIGN: Data were obtained from the 2002/03 New Zealand Health Survey. Risk factor prevalence was determined by: self-reported doctor diagnosis of high blood pressure, high cholesterol and diabetes; self-report of smoking and physical inactivity; and measurement of obesity. Presence of IHD was based on self-report of heart disease (doctor diagnosed at age 25 years or over) together with current medical or past surgical treatment for this disease. Multiple logistic regression was used to determine prevalence rate ratios (PRRs) for males and females separately, adjusting for age, ethnicity and deprivation. RESULTS: The overall prevalence of IHD was 8%. Overall risk factor prevalences were in the range of 20-25% for each of high blood pressure, high cholesterol, smoking, obesity and physical inactivity, and approximately 5% for diabetes. Overall, 94-97% of adults with IHD had at least one risk factor (depending on how smoking was defined). The PRRs of IHD were highest for cholesterol (about 4.5), followed by blood pressure (about 2.3), with all other risk factors around 1.5. PAF estimates indicate that 80-85% of IHD was attributable to the presence of at least one risk factor for all age, gender and ethnic groups. CONCLUSIONS: Established risk factors account for 80-85% of the non-fatal burden of IHD in New Zealand. Limited research resources would be better used to evaluate which interventions are effective and efficient at reducing exposure of all population groups to known risk factors, rather than on identification of additional risk factors. 相似文献
104.
Asle?HoffartEmail author Harold?Sexton Liv?M.?Hedley Catharina?E.?Wang Harald?Holthe Jon?A.?Haugum Hans?M.?Nordahl Ole?Johan?Hovland Arne?Holte 《Cognitive therapy and research》2005,29(6):627-644
One thousand and thirty-seven psychiatric patients and non-patients from six different sites completed the 205-item Young
Schema Questionnaire or its shortended form, the 75-item Young Schema Questionnaire-S. Among 888 of the subjects, who all
were patients, a confirmatory factor analysis (CFA) of the 75 items included in both forms of the questionnaire clearly yielded
the 15 Early Maladaptive Schema (EMS) factors rationally developed by J. E. Young (1990). Confirmatory factor analyses, testing
three models of the higher-order structure of the 15 EMSs, indicated that a four-factor model was the best alternative. The
results slightly favored a correlated four second-order factor model over one also including a third-order global factor.
The four factors or schema domains were Disconnection, Impaired Autonomy, Exaggerated Standards, and Impaired Limits. Scales
derived from the four higher-order factors had good internal and test–retest reliabilities and were related to DSM-IV Cluster
C personality traits, agoraphobic avoidance behavior, and depressive symptoms. 相似文献
105.
McDonald JR Friedman ND Stout JE Sexton DJ Kaye KS 《Archives of internal medicine》2005,165(3):308-313
BACKGROUND: Infections occurring among outpatients having recent contact with the health care system have been termed health care-associated infections. The objective of this study was to analyze the impact of health care-associated status on effectiveness of initial therapy in hospitalized patients with bloodstream infections. METHODS: Prospective cohort study of adults with bloodstream infections at 3 North Carolina hospitals. Bloodstream infection was defined as health care-associated if it occurred within the first 48 hours after hospitalization and if patients had 1 of the following characteristics: had received home health services, outpatient intravenous therapy, or outpatient renal dialysis in the 30 days prior to hospital admission; had been hospitalized within 90 days prior to admission; or lived in a long-term care facility. RESULTS: Of 466 bloodstream infections, 132 (28%) were community-acquired, 178 (38%) were health care-associated, and 156 (33%) were nosocomial. Multivariable logistic regression using community-acquired status as a reference identified health care-associated status (odds ratio, 3.1; 95% confidence interval, 1.6-6.1) and nosocomial status (odds ratio, 4.3; 95% confidence interval, 2.2-8.3) as independent predictors of ineffective initial antibiotic therapy. Among health care-associated characteristics, hospitalization in the 90 days prior to admission was independently associated with ineffective initial therapy (odds ratio, 2.4; 95% confidence interval, 1.4-4.2). CONCLUSIONS: Among patients treated in the hospital for bloodstream infection, health care-associated status was an independent predictor of ineffective initial antibiotic therapy. Hospitalization within 90 days prior to hospital admission was the component of health care-associated status most strongly associated with ineffective initial therapy. 相似文献
106.
107.
An immunosorbent assay using solid-phase attachment of red cells (SPARC) was used for the detection of rubella-specific IgM. The method is described and the results compared with those obtained by the IgM antibody capture radioimmunoassay (MACRIA). One hundred and ninety-nine sera were investigated for the presence of rubella-specific IgM and only one discrepant result occurred, namely a false positive obtained by MACRIA in a patient with infectious mononucleosis. Rheumatoid factor, heterophile antibody, and rubella-specific IgG did not interfere with the results obtained by the SPARC technique. Advantages of the SPARC technique include the case and lack of expense of testing large numbers of sera, the small volume of sample required and the fact that pretreatment of serum is not necessary. 相似文献
108.
Schwartz AC Bradley RL Sexton M Sherry A Ressler KJ 《Psychiatric services (Washington, D.C.)》2005,56(2):212-215
This study examined 184 African-American outpatients in a mental health clinic in the inner city to define the rate of occurrence of traumatic experience and posttraumatic stress disorder (PTSD). This population experienced a high rate of severe trauma. Forty-three percent were found to have PTSD, as measured by the PTSD Symptom Scale. Finally, a chart review of 72 participants found that only 11 percent of participants who met DSM-IV criteria for PTSD also had a chart diagnosis of PTSD. PTSD is a common yet underrecognized and undertreated source of psychiatric morbidity in this urban community of African Americans with low socioeconomic status. 相似文献
109.
110.
Karamlou T Landry G Sexton G Chan B Moneta G Taylor L 《Journal of vascular surgery》2004,39(4):763-770
OBJECTIVE: Multidisciplinary vascular centers (VCs) have been proposed to integrate vascular patient care. No studies, however, have assessed referring physician interest or which services should be provided. A statewide survey of primary care physicians (PCPs) was performed to answer these questions. METHODS: Questionnaires were mailed to 3711 PCPs, asking about familiarity with vascular disease, potential VC usage, and services VCs should provide. Univariate and multivariate analysis was used to determine which PCPs would refer patients, the services desired, and which patients would be referred. RESULTS: Of 1006 PCPs who responded, 66% would refer patients to a VC, especially patients younger than 50 years (P<.001) and those with lower extremity disease (P<.001) or abdominal aortic aneurysm (P<.001). PCPs practicing within 50 miles of a VC (P<.001), those in practice less than 5 years (P<.001), and those without specific training in vascular disease during residency (P=.004) were most likely to refer patients. Vascular surgery (97%), interventional radiology (90%), and a noninvasive vascular laboratory (82%) were considered the most important services, and physician educational services (62%) were also desirable. PCPs did not think cardiology, cardiac surgery, smoking cessation programs, or diabetes or lipid management are needed. Reasons for VC nonuse included travel distance (23%), sufficient local services (21%), and insurance issues (12%). Only 16% of PCPs believe that their patients with vascular disease currently receive optimal care. CONCLUSION: There is considerable interest in VCs among PCPs. In contrast to recently described models, VCs need not incorporate cardiology, cardiac surgery, smoking cessation programs, or diabetes or lipid management. VCs should include vascular surgery, interventional radiology, a noninvasive vascular laboratory, and physician educational services. 相似文献