全文获取类型
收费全文 | 21692篇 |
免费 | 1432篇 |
国内免费 | 41篇 |
专业分类
耳鼻咽喉 | 133篇 |
儿科学 | 737篇 |
妇产科学 | 727篇 |
基础医学 | 2919篇 |
口腔科学 | 397篇 |
临床医学 | 3516篇 |
内科学 | 4121篇 |
皮肤病学 | 236篇 |
神经病学 | 2180篇 |
特种医学 | 335篇 |
外科学 | 1639篇 |
综合类 | 290篇 |
一般理论 | 31篇 |
预防医学 | 2937篇 |
眼科学 | 189篇 |
药学 | 1348篇 |
中国医学 | 18篇 |
肿瘤学 | 1412篇 |
出版年
2023年 | 97篇 |
2022年 | 171篇 |
2021年 | 356篇 |
2020年 | 235篇 |
2019年 | 403篇 |
2018年 | 416篇 |
2017年 | 299篇 |
2016年 | 375篇 |
2015年 | 436篇 |
2014年 | 641篇 |
2013年 | 1025篇 |
2012年 | 1474篇 |
2011年 | 1459篇 |
2010年 | 824篇 |
2009年 | 793篇 |
2008年 | 1422篇 |
2007年 | 1431篇 |
2006年 | 1421篇 |
2005年 | 1456篇 |
2004年 | 1382篇 |
2003年 | 1366篇 |
2002年 | 1311篇 |
2001年 | 220篇 |
2000年 | 193篇 |
1999年 | 228篇 |
1998年 | 273篇 |
1997年 | 239篇 |
1996年 | 192篇 |
1995年 | 210篇 |
1994年 | 190篇 |
1993年 | 185篇 |
1992年 | 174篇 |
1991年 | 173篇 |
1990年 | 142篇 |
1989年 | 164篇 |
1988年 | 140篇 |
1987年 | 140篇 |
1986年 | 113篇 |
1985年 | 116篇 |
1984年 | 151篇 |
1983年 | 119篇 |
1982年 | 134篇 |
1981年 | 122篇 |
1980年 | 125篇 |
1979年 | 84篇 |
1978年 | 85篇 |
1977年 | 58篇 |
1976年 | 58篇 |
1974年 | 49篇 |
1973年 | 46篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
11.
Celia F Hybels Dan G Blazer Carl F Pieper Bruce M Burchett Judith C Hays Gerda G Fillenbaum Laura D Kubzansky Lisa F Berkman 《The American journal of geriatric psychiatry》2006,14(6):498-506
OBJECTIVE: Neighborhood sociodemographic characteristics may be important to the mental health of older adults who have decreased mobility and fewer resources. Our objective was to examine the association between neighborhood context and level of depressive symptomatology in older adults in a diverse geographic region of central North Carolina. METHODS: The sample included 2,998 adults 65 or older residing in 91 census tracts. Depressive symptoms were measured using the Center for Epidemiologic Studies-Depression scale (CES-D). Neighborhoods were characterized by five census-based characteristics: socioeconomic disadvantage, socioeconomic advantage, racial/ethnic heterogeneity, residential stability, and age structure. RESULTS: In ecologic level analyses, level of census tract socioeconomic disadvantage was associated with increased depressive symptoms. To determine whether neighborhood context was associated with depressive symptoms independently of individual characteristics, the authors used multilevel modeling. The authors examined the ability of each of five neighborhood (level 2) characteristics to predict a level 1 outcome (CES-D symptoms) controlling for the effects of individual (level 1) characteristics. Younger age, being widowed, lower income, and having some functional limitations were associated with increased depression symptoms conditional on census tract random effects. However, none of the neighborhood characteristics was significantly associated with depression symptoms, conditional on census tract random effects, either unadjusted or adjusted for individual characteristics. CONCLUSION: Any observed association between neighborhood sociodemographic characteristics and individual depressive symptoms in our sample may reflect the characteristics of the individuals who reside in the neighborhood rather than the neighborhood characteristics themselves. The use of multilevel modeling is important to separate these effects. 相似文献
12.
Debra L. Roter Richard M. Frankel Judith A. Hall David Sluyter 《Journal of general internal medicine》2006,21(1):28-34
Relationship-centered care reflects both knowing and feeling: the knowledge that physician and patient bring from their respective domains of expertise, and the physician’s and patient’s experience, expression, and perception of emotions during the medical encounter. These processes are conveyed and reciprocated in the care process through verbal and nonverbal communication. We suggest that the emotional context of care is especially related to nonverbal communication and that emotion-related communication skills, including sending and receiving nonverbal messages and emotional self-awareness, are critical elements of high-quality care. Although nonverbal behavior has received far less study than other care processes, the current review argues that it holds significance for the therapeutic relationship and influences important outcomes including satisfaction, adherence, and clinical outcomes of care. 相似文献
13.
Nawf Sharief Judith E. Kingston Vanessa M. Wright Kate Costeloe 《Pediatric hematology and oncology》1991,8(4):323-327
We describe a familial case of Marfan's syndrome with associated intrathoracic stomach detected during the neonatal period. The patient developed a primitive leukemia at 3 months of age. Acute leukemia in a patient with Marfan's syndrome has not previously been reported. 相似文献
14.
15.
In contrast with cross-sectional designs used in previous studies, this exploratory study compared survey data from 127 matched pairs of clinical pharmacists and physicians working together. Physicians' perceptions of the importance of clinical pharmacy activities for patient care and the competence of pharmacists performing the activities were examined for their influence on prescribing behavior in an institutional setting. Data from a national survey showed that physicians rated pharmacists higher regarding recommendations based on drug use evaluations (p = 0.004) and competency to provide all clinical pharmacy services. Scores for pharmacokinetics ratings were similar between pharmacists and physicians (p = 0.168). Pharmacists rated the importance of recommendations based on cost-effectiveness higher than physicians (p = 0.012). Overall, physicians' perceptions of activity importance for patient care and pharmacist competency appear to dictate pharmacists' influence on physician prescribing behavior (R = 0.723). 相似文献
16.
Judith B. Erickson 《Child & youth care forum》1988,17(2):86-103
Several million American children are currently unsupervised during the hours between school and parents' leaving for and/or return from the workplace. Many families would prefer other arrangements, but cost or availability factors present insurmountable barriers. Although growing, the public response continues to fall far short of the need; in the meantime, private entrepreneurs are moving to fill the gaps in available services. But if these programs for school-aged children are to serve functions other than the aggrandizement of their sponsors, they must be focused on the real needs that exist among real American children. Among the real children in need of care are those who are impoverished, unsupervised, unfit physically, unprepared for the demands of school and workplace, hurried into premature adulthood, and/or disconnected from the social worlds around them. Professional child and youth care workers with experience in day care and residential settings have the preparation needed to take leadership roles in creating developmentally appropriate, effective programs to meet the emerging demands for school-age child care and to weave them into a fabric of youth-centered community services. 相似文献
17.
Edward M Messing Judith Manola George Wilding Kathleen Propert Jonathan Fleischmann E David Crawford J Edson Pontes Richard Hahn Donald Trump 《Journal of clinical oncology》2003,21(7):1214-1222
PURPOSE: To evaluate the role of adjuvant interferon alfa after complete resection of locally extensive renal cell carcinoma. PATIENTS AND METHODS: A total of 283 eligible patients with pT3-4a and/or node-positive disease were randomly assigned after radical nephrectomy and lymphadenectomy to observation or to interferon alfa-NL (Wellferon, Burroughs-Wellcome, Research Park, NC) given daily for 5 days every 3 weeks for up to 12 cycles. Patients were stratified on the basis of pathologic stage. Patients remained on treatment until documented recurrence, excessive toxicity, or patient/physician preference deemed removal appropriate. RESULTS: At median follow-up of 10.4 years, median survival was 7.4 years in the observation arm and 5.1 year in the treatment arm (log-rank P =.09). Median recurrence-free survival was 3.0 years in the observation arm and 2.2 years in the interferon arm (P =.33). Performance status (P =.003), nodal status (N2 v N0, P <.0001), and tumor stage (P =.0002) were significant prognostic factors in multivariate analysis. A proportional hazards model examining the effects of treatment arm and time to recurrence on survival after recurrence among patients who recurred found that random assignment to interferon treatment (P =.009) and shorter time to recurrence (P <.0001) were independent predictors of shorter survival after recurrence. Although no lethal toxicities were observed, severe (grade 4) toxicities including neutropenia, myalgia, fatigue, depression, and other neurologic toxicities occurred in 11.4% of those randomly assigned to interferon treatment. CONCLUSION: Adjuvant treatment with interferon did not contribute to survival or relapse-free survival in this group of patients. 相似文献
18.
19.
20.