全文获取类型
收费全文 | 31852篇 |
免费 | 1807篇 |
国内免费 | 99篇 |
专业分类
耳鼻咽喉 | 252篇 |
儿科学 | 1092篇 |
妇产科学 | 916篇 |
基础医学 | 3569篇 |
口腔科学 | 390篇 |
临床医学 | 5819篇 |
内科学 | 5317篇 |
皮肤病学 | 343篇 |
神经病学 | 3111篇 |
特种医学 | 630篇 |
外国民族医学 | 1篇 |
外科学 | 3056篇 |
综合类 | 297篇 |
现状与发展 | 1篇 |
一般理论 | 50篇 |
预防医学 | 4457篇 |
眼科学 | 444篇 |
药学 | 1847篇 |
中国医学 | 33篇 |
肿瘤学 | 2133篇 |
出版年
2023年 | 192篇 |
2022年 | 326篇 |
2021年 | 591篇 |
2020年 | 424篇 |
2019年 | 651篇 |
2018年 | 807篇 |
2017年 | 562篇 |
2016年 | 633篇 |
2015年 | 672篇 |
2014年 | 990篇 |
2013年 | 1589篇 |
2012年 | 2295篇 |
2011年 | 2424篇 |
2010年 | 1286篇 |
2009年 | 1127篇 |
2008年 | 2189篇 |
2007年 | 2386篇 |
2006年 | 2272篇 |
2005年 | 2204篇 |
2004年 | 2037篇 |
2003年 | 1959篇 |
2002年 | 1868篇 |
2001年 | 218篇 |
2000年 | 180篇 |
1999年 | 280篇 |
1998年 | 372篇 |
1997年 | 311篇 |
1996年 | 245篇 |
1995年 | 274篇 |
1994年 | 213篇 |
1993年 | 210篇 |
1992年 | 131篇 |
1991年 | 136篇 |
1990年 | 135篇 |
1989年 | 111篇 |
1988年 | 102篇 |
1987年 | 94篇 |
1986年 | 92篇 |
1985年 | 103篇 |
1984年 | 124篇 |
1983年 | 126篇 |
1982年 | 144篇 |
1981年 | 139篇 |
1980年 | 118篇 |
1979年 | 56篇 |
1978年 | 71篇 |
1977年 | 61篇 |
1976年 | 47篇 |
1975年 | 36篇 |
1974年 | 38篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
Barbara Bruemmer Author Vitae Jeffrey HarrisAuthor Vitae Phil GleasonAuthor Vitae Carol J. BousheyAuthor Vitae Patricia M. SheeanAuthor Vitae Sujata ArcherAuthor Vitae Linda Van HornAuthor Vitae 《Journal of the American Dietetic Association》2009,109(10):1728-1737
The use of epidemiologic research designs and analytical methods is common in dietetics research. Food and nutrition professionals who seek to perform evidence-based practice or participate in research design, analysis, and communication need skills in the essentials of epidemiology. This is one of a series of monographs on research methodology that addresses these needs and supports the goals of the Board of Editors of the Journal of the American Dietetic Association to further enhance competency and skills. This monograph focuses on statistical approaches for univariate analyses used with the primary observational study designs associated with epidemiology. Tables illustrating the presentation and interpretation of these results are included. 相似文献
12.
Linda W Duncombe 《The American journal of occupational therapy》2004,58(3):272-278
OBJECTIVE: The purpose of this study was to compare learning of a functional living skill in two contexts for individuals with long-term schizophrenia. METHOD: Forty-four people with schizophrenia were matched on cognitive level. One of each pair was randomly designated to either a clinic or home cooking group, with the other assigned to the remaining group. Cooking skill was assessed using the Kitchen Task Assessment-Modified (KTA-M) both before and after the intervention. Learning for each group was analyzed using t tests. A multiple regression analysis to control for baseline differences was used to compare the learning of the two groups. RESULTS: Participants in both groups scored significantly higher on the KTA-M after cooking lessons (t = 5.57, df = 21, p < .0001--clinic; t = 7.81. df = 21, p < .0002--home) reflecting learning of cooking skill; there was no statistically significant difference in scores on the KTA-M between the two groups based on where the learning took place (beta = -1.8, df = 42, p < 0.23). Qualitative differences between the learning environments provide suggestions for teaching functional living skills to this population. CONCLUSIONS: Learning new skills in the home was not better than learning in the clinic for people with schizophrenia in this study. Further research on the effect of context on learning for people with cognitive dysfunction and schizophrenia is recommended. 相似文献
13.
Eric Lim Ziad Ali Ayyaz Ali Reza Motalleb-Zadeh Christopher Jackson Seok Ling Ong James Halstead Linda Sharples Jayan Parameshwar John Wallwork Stephen R Large 《The Journal of heart and lung transplantation》2005,24(8):983-989
BACKGROUND: To ascertain survival of ischemic advanced heart failure patients by treatment allocation, we examined the outcome of transplant assessment patients allocated to medical therapy, high-risk conventional surgery, or transplantation. METHODS: Patients were identified from the Papworth transplant database and excluded if primary etiology was not ischemic. Grouping was undertaken according to treatment allocation at initial assessment, and analysis was performed by intention to treat. Survival was computed from the time of assessment and Cox regression used to stratify patients according risk with the Heart Failure Survival Score. RESULTS: From May 1993 to September 2001, a total of 755 patients were admitted for transplant assessment, with 348 (46.1%) identified as having heart failure of ischemic origin. Variables required for calculation of the Heart Failure Survival Score was available in 273 patients (78.4%), and 20 patients (7.3%) were lost to follow-up. Of the remaining 253 patients, 89 (35.2%) were allocated to medical therapy, 32 (12.6%) to surgery, and 132 (52.2%) to transplantation. The relative risk (95% confidence limit) of death compared with medical therapy was 0.62 (0.28, 1.40) for surgery and 0.38 (0.24, 0.61) for transplantation in medium- to high-risk patients. For low-risk patients, the relative risks for death compared with medical therapy were 1.87 (0.63, 5.60) for surgery and 1.97 (0.79, 4.96) for transplantation. CONCLUSIONS: Transplantation improved survival of medium- and high-risk patients compared with medical therapy. In the low-risk group, this was not evident. However, repeated assessment of risk is required because the hazard for death rises steadily after the third year in these patients. 相似文献
14.
PURPOSE: Currently, no drug treatment is available for strengthening underacting extraocular muscles (EOM) in strabismus. We showed previously that single injections of insulin-like growth factor (IGF-1) result in significant but short-term increases in muscle force generation. This study examined the effects of sustained release of IGF-1 on force generation in rabbit superior rectus muscles. METHODS: In adult rabbits, slow-release pellets containing IGF-1 were implanted on the global side of one superior rectus muscle. After 1 week, or 1, 2, 3, or 6 months, treated and control muscles were examined for force generation using an in vitro physiology apparatus. All muscles were prepared for histology and mean myofiber cross-sectional areas were determined. RESULTS: One and 3 months after pellet implantation, treated muscles generated significantly greater force than contralateral control muscles, whereas at 2 months, no significant difference was found. Force per cross-sectional area (mN/cm(2)) at 3 months also increased significantly in the treated muscles. Mean muscle cross-sectional area increased significantly after 1, 2, and 3 months of sustained exposure to IGF-1 compared with controls. After an additional 3 months without IGF-1 exposure, mean cross-sectional areas were significantly greater than controls but significantly reduced compared with areas at 1, 2, and 3 months. CONCLUSIONS: IGF-1 appears to be highly effective in increasing muscle force generation. Because slow release of IGF-1 results in sustained increases in EOM force generation, it may be a potentially useful alternative to surgical resection procedures because it avoids many of the potential long-term biomechanical hazards of resection surgery. 相似文献
15.
Csar Galeano Bruno Jubelin Linda Biron Lilianne Guenette 《Neurourology and urodynamics》1986,5(2):203-218
Naloxone, an opioid peptide antagonist, has been reported to facilitate voiding in neurologic bladder disorders, but its effects on the neural micturition reflex arc are poorly understood. We studied the effect of naloxone in 34 male adult cats, spinalized at C5-C6 level 7 to 119 days previously. Each cat served as its own control. The following tests were performed: Urethral pressure profiles, cystosphincterograms with the urethro-vesical junction opened and closed and mechanograms of the detrusor, and the circular and longitudinal urethral muscles. The study included (1) the effects of anesthesia of the bladder and pelvic nerve, as well as that of the urethral and pudendal nerves; (2) the action of naloxone; and (3) the action of oxymorphone. Our results demonstrated that naloxone (1) increased somatic (osteotendinous and nociceptive) reflexes and aggravated spasticity; (2) increased vegetative micturitional and sexual reflexes, in particular the urethra-urethral contraction reflex, aggravating the spasmodic contractions of the external sphincter; and (3) increased the frequency and intensity of the mass reflex. In consequence, we suggest that naloxone is contraindicated in cases of spinal cord lesions with detrusor-sphincter dyssynergia syndrome. 相似文献
16.
Oestrogens and the lower urinary tract 总被引:1,自引:0,他引:1
17.
18.
Faced with a rapidly changing market, increased legislation and intense competition, mental health service providers must
be sophisticated planners and position themselves advantageously in the marketplace. They can effectively position themselves
to be profitable and sustaining through market segmentation and sensitivity. The following article will address one concept
of marketing that has received less attention but is of critical importance: positioning. As the market environment becomes
increasingly competitive, positioning will be the key to success for mental health programs and institutions.
LINDA A. LENNOX, M.S.N., CMHA, has extensive experience in mental health administration. She currently resides in the Washington,
DC area.
DAVID AMBROSE, D.B.A., is the Lucas Professor of Business Administration, University of Nebraska at Omaha, Omaha, NE. 相似文献
19.
Elizabeth E. Epstein Barbara S. McCrady Linda S. Hirsch 《Alcoholism, clinical and experimental research》1997,21(3):547-556
Current knowledge about alcohol and marital functioning is limited by restrictive sample selection, inattention to the literature on individual-based alcoholic subtypes, and lack of research linking individual differences among alcoholics to marital functioning. The present study was designed to study marital functioning of alcoholics in light of current alcohol typologies. Subjects were part of a larger study on conjoint treatment of alcoholic males and their female partners. Four typologies—including Type 1/2, In-Home/Out-of-home, SteadyIEpisodic, and EarlyILate Onset—were tested for replicability and discriminant validity before linking them to marital functioning. Discriminant validity was found only for the Early (59%)-versus Late (41 %)-Onset typology; thus, further analyses linked only this typology with marital functioning. At baseline, Early-Onset couples reported more marital instability, and the females in these couples were more distressed. During treatment, Early-Onset couples reported higher daily marital satisfaction than Late-Onset couples. Regardless of age of onset, males reported higher marital satisfaction than their spouses during treatment, but their satisfaction did not increase during treatment. Female partners' marital satisfaction increased during treatment. Female partners of Late-Onset males reported particularly low marital satisfaction during treatment. Parsing the sample according to the early-/late-onset typology yielded different predictors of marital satisfaction for males and females within each subtype. For female partners of Early-Onset alcoholics, psychological distress unrelated to her pattner's drinking severity was most associated with her own marital satisfaction, whereas marital adjustment of female partners of Late-Onset alcoholics was most associated with the male's level of perceptual accuracy regarding her needs. This pattern was reversed for the males; marital adjustment of Early-Onset alcoholics was most associated with his partner's perceptual accuracy of his needs, whereas marital functioning of Late-Onset alcoholics was best accounted for by his own psychological distress. 相似文献
20.