收费全文 | 4968篇 |
免费 | 436篇 |
国内免费 | 40篇 |
耳鼻咽喉 | 14篇 |
儿科学 | 221篇 |
妇产科学 | 67篇 |
基础医学 | 571篇 |
口腔科学 | 79篇 |
临床医学 | 530篇 |
内科学 | 964篇 |
皮肤病学 | 68篇 |
神经病学 | 341篇 |
特种医学 | 345篇 |
外科学 | 658篇 |
综合类 | 149篇 |
一般理论 | 3篇 |
预防医学 | 481篇 |
眼科学 | 138篇 |
药学 | 330篇 |
中国医学 | 10篇 |
肿瘤学 | 475篇 |
2023年 | 25篇 |
2022年 | 50篇 |
2021年 | 110篇 |
2020年 | 56篇 |
2019年 | 117篇 |
2018年 | 96篇 |
2017年 | 69篇 |
2016年 | 101篇 |
2015年 | 113篇 |
2014年 | 138篇 |
2013年 | 224篇 |
2012年 | 259篇 |
2011年 | 259篇 |
2010年 | 177篇 |
2009年 | 159篇 |
2008年 | 229篇 |
2007年 | 245篇 |
2006年 | 259篇 |
2005年 | 247篇 |
2004年 | 242篇 |
2003年 | 231篇 |
2002年 | 176篇 |
2001年 | 196篇 |
2000年 | 148篇 |
1999年 | 114篇 |
1998年 | 73篇 |
1997年 | 72篇 |
1996年 | 60篇 |
1995年 | 56篇 |
1994年 | 47篇 |
1993年 | 41篇 |
1992年 | 67篇 |
1991年 | 65篇 |
1990年 | 57篇 |
1989年 | 64篇 |
1988年 | 52篇 |
1987年 | 73篇 |
1986年 | 42篇 |
1985年 | 52篇 |
1984年 | 34篇 |
1983年 | 40篇 |
1982年 | 30篇 |
1981年 | 26篇 |
1980年 | 34篇 |
1978年 | 31篇 |
1977年 | 40篇 |
1976年 | 32篇 |
1975年 | 32篇 |
1974年 | 29篇 |
1972年 | 32篇 |
In order to offer early and accessible treatment for adolescents with depression, brief and effective treatments in adolescents’ everyday surroundings are needed. This randomized controlled trial studied the preliminary effectiveness, feasibility, and acceptability of interpersonal counseling (IPC) and brief psychosocial support (BPS) in school health and welfare services. The study was conducted in the 28 lower secondary schools of a large city in Southern Finland, randomized to provide either IPC or BPS. Help-seeking 12–16-year-old adolescents with mild-to-moderate depression, with and without comorbid anxiety, were included in the study. Fifty-five adolescents received either 6 weekly sessions of IPC or BPS and two follow-up sessions. Outcome measures included self- and clinician-rated measures of depression, global functioning, and psychological distress/well-being. To assess feasibility and acceptability of the treatments, adolescents’ and counselors’ treatment compliance and satisfaction with treatment were assessed. Both treatments were effective in reducing depressive disorders and improving adolescents’ overall functioning and well-being. At post-treatment, in both groups, over 50% of adolescents achieved recovery based on self-report and over 70% based on observer report. Effect sizes for change were medium or large in both groups at post-treatment and increased at 6-month follow-up. A trend indicating greater baseline symptom severity among adolescents treated in the IPC-providing schools was observed. Adolescents and counselors in both groups were satisfied with the treatment, and 89% of the adolescents completed the treatments and follow-ups. This trial suggests that both IPC and BPS are feasible, acceptable, and effective treatments for mild-to-moderate depression in the school setting. In addition, IPC seems effective even if comorbid anxiety exists. Our study shows that brief, structured interventions, such as IPC and BPS, are beneficial in treating mild-to-moderate depression in school settings and can be administered by professionals working at school.
Trial registrationhttp://www.clinicaltrials.gov. Unique identifier: NCT03001245.
相似文献![点击此处可从《Proceedings of the National Academy of Sciences of the United States of America》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Methods: After measuring cardiac function on a Langendorff apparatus, hearts were perfused with cardioplegia alone (controls), cardioplegia containing 500 [mu]m bupivacaine, or cardioplegia containing 2 mm lidocaine; were stored at 4[degrees]C for 12 h; and were then reperfused. Heart rate and left ventricular developed pressures were measured for 60 min. Maximum positive rate of change in ventricular pressure, oxygen consumption, and lactate dehydrogenase release were also measured.
Results: All bupivacaine-treated, four of five lidocaine-treated, and no control hearts beat throughout the 60-min recovery period. Mean values of heart rate, left ventricular developed pressure, maximum positive rate of change in ventricular pressure, rate-pressure product, and efficiency in bupivacaine-treated hearts exceeded those of the control group (P < 0.001 at 60 min for all). Mean values of the lidocaine group were intermediate. Oxygen consumption of the control group exceeded the other groups early in recovery, but not at later times. Lactate dehydrogenase release from the bupivacaine group was less than that from the control group (P < 0.001) but did not differ from baseline. 相似文献
Factors known to predispose to fungal sepsis were present in all cases. All patients had large burns (14–98 per cent total body surface (TBSA) with a mean of 48.3 per cent). All but one patient had at least one central venous line. Respiratory problems requiring ventilator support were present in 24 patients.
Sixteen patients had Candida albicans sepsis, two in association with another fungal sepsis. Candida parapsilosis was encountered in nine patients, one in combination with another species. Four patients had Candida tropicalis.
Amphotericin B was prescribed therapeutically in 25 patients, in seven together with fluconazole. Two patients received fluconazole only and two received no antifungal therapy.
There were eight deaths all attributed to sepsis and all of whom had multiple organ failure. Five of those who died had completed a course of amphotericin B therapy, two were receiving treatment at the time of death, and one patient died before culture data became available. Early and aggressive therapy is advised and amphotericin B appears to be the drug of choice. 相似文献