全文获取类型
收费全文 | 53924篇 |
免费 | 4493篇 |
国内免费 | 149篇 |
专业分类
耳鼻咽喉 | 497篇 |
儿科学 | 1378篇 |
妇产科学 | 1022篇 |
基础医学 | 7894篇 |
口腔科学 | 944篇 |
临床医学 | 5509篇 |
内科学 | 11066篇 |
皮肤病学 | 1004篇 |
神经病学 | 5416篇 |
特种医学 | 1991篇 |
外国民族医学 | 11篇 |
外科学 | 7656篇 |
综合类 | 971篇 |
一般理论 | 86篇 |
预防医学 | 4770篇 |
眼科学 | 1223篇 |
药学 | 3842篇 |
中国医学 | 101篇 |
肿瘤学 | 3185篇 |
出版年
2023年 | 408篇 |
2022年 | 653篇 |
2021年 | 1312篇 |
2020年 | 869篇 |
2019年 | 1221篇 |
2018年 | 1422篇 |
2017年 | 1101篇 |
2016年 | 1198篇 |
2015年 | 1340篇 |
2014年 | 1806篇 |
2013年 | 2289篇 |
2012年 | 3455篇 |
2011年 | 3619篇 |
2010年 | 2026篇 |
2009年 | 1691篇 |
2008年 | 2856篇 |
2007年 | 2988篇 |
2006年 | 2764篇 |
2005年 | 2588篇 |
2004年 | 2487篇 |
2003年 | 2126篇 |
2002年 | 2019篇 |
2001年 | 1110篇 |
2000年 | 1111篇 |
1999年 | 1028篇 |
1998年 | 534篇 |
1997年 | 432篇 |
1996年 | 422篇 |
1995年 | 400篇 |
1994年 | 348篇 |
1993年 | 289篇 |
1992年 | 674篇 |
1991年 | 662篇 |
1990年 | 646篇 |
1989年 | 614篇 |
1988年 | 537篇 |
1987年 | 583篇 |
1986年 | 582篇 |
1985年 | 613篇 |
1984年 | 481篇 |
1983年 | 386篇 |
1982年 | 241篇 |
1979年 | 427篇 |
1978年 | 293篇 |
1977年 | 245篇 |
1975年 | 235篇 |
1974年 | 257篇 |
1973年 | 259篇 |
1972年 | 250篇 |
1971年 | 229篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Betsy D. Kennard Susan G. Silva Simon Tonev Paul Rohde Jennifer L. Hughes Benedetto Vitiello Christopher J. Kratochvil John F. Curry Graham J. Emslie Mark Reinecke John March 《Journal of the American Academy of Child and Adolescent Psychiatry》2009,48(2):186-195
ObjectiveWe examine remission rate probabilities, recovery rates, and residual symptoms across 36 weeks in the Treatment for Adolescents with Depression Study (TADS).MethodThe TADS, a multisite clinical trial, randomized 439 adolescents with major depressive disorder to 12 weeks of treatment with fluoxetine, cognitive–behavioral therapy, their combination, or pill placebo. The pill placebo group, treated openly after week 12, was not included in the subsequent analyses. Treatment differences in remission rates and probabilities of remission over time are compared. Recovery rates in remitters at weeks 12 (acute phase remitters) and 18 (continuation phase remitters) are summarized. We also examined whether residual symptoms at the end of 12 weeks of acute treatment predicted later remission.ResultsAt week 36, the estimated remission rates for intention-to-treat cases were as follows: combination, 60%; fluoxetine, 55%; cognitive–behavioral therapy, 64%; and overall, 60%. Paired comparisons reveal that, at week 24, all active treatments converge on remission outcomes. The recovery rate at week 36 was 65% for acute phase remitters and 71% for continuation phase remitters, with no significant between-treatment differences in recovery rates. Residual symptoms at the end of acute treatment predicted failure to achieve remission at weeks 18 and 36.ConclusionsMost depressed adolescents in all three treatment modalities achieved remission at the end of 9 months of treatment. 相似文献
22.
Niall C McGonigle J Mark Jones Pushpinder Sidhu Simon W MacGowan 《Journal of cardiothoracic surgery》2007,2(1):24-6
Background
Long-term survival for combined aortic and mitral valve replacement appears to be determined by the mitral valve prosthesis from our previous studies. This 21-year retrospective study assess long-term outcome and durability of aortic valve replacement (AVR) with either concomitant mitral valve replacement (MVR) or mitral valve repair (MVrep). We consider only a single mechanical prosthesis. 相似文献23.
Joanne Dollard Jacquie Smith David R Thompson Simon Stewart 《European Journal of Cardiovascular Nursing》2004,3(1):27-42
BACKGROUND: Cardiac rehabilitation (CR) has an evidence base but traditional models may not readily apply to people living in rural and remote regions. AIM:: To outline published comprehensive and non-hospital based CR models used for people discharged from hospital after a cardiac event that have potential relevance to those living in rural and remote areas in Australia. METHODS: The PubMed database was searched using Medical subject headings (MeSH) terms and the key word 'cardiac rehabilitation' limited to clinical trials. Articles were retrieved if they included at least two components of CR and were not based in an outpatient setting. RESULTS: No CR models specifically developed for rural and remote areas were identified. However, 14 studies were found that outlined 11 non-conventional comprehensive CR models. All provided CR in a home-based setting. Health professionals provided support via telephone contact or home visits, and via resources such as the Heart Manual. Reported outcomes from these CR programs varied: ranging from an increase in knowledge of risk factors, to improvements in physical activity, decreased risk factor profile, improved psychological and social functioning and reductions in health service costs and mortality. CONCLUSION: Home-based, CR models have the most substantive evidence base and, therefore the greatest potential to be developed and made accessible to eligible people living in rural and remote areas. 相似文献
24.
Simon Bell Andrew J McLachlan Parisa Aslani Paula Whitehead Timothy F Chen 《Australia and New Zealand Health Policy》2005,2(1):29
The objective of this systematic review was to evaluate the impact of pharmacist delivered community-based services to optimise the use of medications for mental illness. Twenty-two controlled (randomised and non-randomised) studies of pharmacists' interventions in community and residential aged care settings identified in international scientific literature were included for review. Papers were assessed for study design, service recipient, country of origin, intervention type, number of participating pharmacists, methodological quality and outcome measurement. Three studies showed that pharmacists' medication counselling and treatment monitoring can improve adherence to antidepressant medications among those commencing treatment when calculated using an intention-to-treat analysis. Four trials demonstrated that pharmacist conducted medication reviews may reduce the number of potentially inappropriate medications prescribed to those at high risk of medication misadventure. The results of this review provide some evidence that pharmacists can contribute to optimising the use of medications for mental illness in the community setting. However, more well designed studies are needed to assess the impact of pharmacists as members of community mental health teams and as providers of comprehensive medicines information to people with schizophrenia and bipolar disorder 相似文献
25.
Current transition assessment practices. 总被引:1,自引:0,他引:1
Although researchers have called for a movement away from prediction-related assessments to those which identify specific skill deficits, the extent to which professionals responsible for vocational assessment have shifted their focus is uncertain. The purpose of this investigation was to assess the frequency with which specified prediction-related and skill deficit-related vocational assessment procedures were administered by a sample of secondary-level teachers and employment training specialists. Additionally, the frequency with which these professionals used assessment data to aid in decision making was determined. The results revealed that teachers and employment training personnel used a variety of assessment procedures to make transition decisions. The implications of these findings are discussed. 相似文献
26.
27.
A number of vitamin D3 metabolites inhibit benzodiazepine- and dimethyl sulfoxide-induced differentiation of Friend erythroleukemia cells. The inhibition is dose dependent and occurs at nM concentrations. The order of potency of these compounds is 1,25-dihydroxycholecalciferol greater than 1,25,26-trihydroxycholecalciferol greater than 1,24R,25-trihydroxycholecalciferol greater than 1 alpha-hydroxycholecalciferol greater than 24R,25-dihydroxycholecalciferol greater than 25S,26-dihydroxycholecalciferol. The inhibition is maximal when the vitamin D3 analogs are added together with the inducer, and becomes progressively decreased with delayed addition. These results suggest that the vitamin D3 metabolites may play a regulatory role in erythropoiesis. 相似文献
28.
Limb-salvage treatment versus amputation for osteosarcoma of the distal end of the femur 总被引:14,自引:0,他引:14
M A Simon M A Aschliman N Thomas H J Mankin 《The Journal of bone and joint surgery. American volume》1986,68(9):1331-1337
A retrospective multi-institutional study of 227 patients with osteosarcoma of the distal end of the femur was done to compare rates of local recurrence, metastasis, and survival. Three cohorts of patients who had had either a limb-sparing procedure, an above-the-knee amputation, or disarticulation of the hip were compared. The results revealed prevalences of eight of seventy-three, nine of 115, and zero of thirty-nine as to local recurrence; forty-three of seventy-three, sixty-five of 115, and twenty-one of thirty-nine as to metastasis; and thirty-three of seventy-three, forty-eight of 115, and eighteen of thirty-nine as to death. Of the seventeen patients who had a local recurrence, sixteen died. In the limb-salvage group, eighteen patients required amputation, because of local recurrence in eight and other local complications in ten. The Kaplan-Meier estimates of the percentage of patients who survived and the percentage of patients without recurrent disease showed no difference among the three surgical groups (Mantel-Cox test statistic: p = 0.8) after a median length of follow-up of five and one-half years. Various covariant adjusted estimates yielded similar results. For the entire group of patients, the rate of continuously disease-free survival was 42 per cent, and the over-all rate of survival was 55 per cent at five years. It appears that, compared with above-the-knee amputation or disarticulation of the hip, the use of a limb-salvage procedure for osteosarcoma of the distal end of the femur did not shorten the disease-free interval or compromise long-term survival. 相似文献
29.
Peter J. Morgan Lynda M. Williams Gary Davidson Wilfred Lawson Edward Howell 《Journal of neuroendocrinology》1989,1(1):1-4
The functional significance of the pars tuberalis (PT) of the mammalian adenohypophysis has remained an enigma (1, 2). One view of its function is that it acts as an auxiliary gland to support the endocrine role of the pars distalis (PD) (2), as it has been shown to contain immunocytochemically identifiable thyrotrophs and gonadotrophs (1). Many of the cells of the PT are, however, ultrastructurally unique suggesting an independent function for this tissue. Our recent demonstration that the PT of the rat is a major binding site for the ligand iodomelatonin lends further support to this idea (3). We have utilized the highly specific ligand [125 l]melatonin, and have demonstrated that it binds exclusively, with very high affinity, to the PT but not the PD of the adult sheep adenohypophysis. These findings support the conclusion that the PT has a distinct role in relation to melatonin action and seasonal reproduction. 相似文献
30.