全文获取类型
收费全文 | 199303篇 |
免费 | 2515篇 |
国内免费 | 81篇 |
专业分类
耳鼻咽喉 | 1297篇 |
儿科学 | 7382篇 |
妇产科学 | 3592篇 |
基础医学 | 20149篇 |
口腔科学 | 1976篇 |
临床医学 | 15915篇 |
内科学 | 35059篇 |
皮肤病学 | 1093篇 |
神经病学 | 18942篇 |
特种医学 | 9441篇 |
外科学 | 30655篇 |
综合类 | 2477篇 |
一般理论 | 26篇 |
预防医学 | 20889篇 |
眼科学 | 3158篇 |
药学 | 11181篇 |
1篇 | |
中国医学 | 679篇 |
肿瘤学 | 17987篇 |
出版年
2023年 | 211篇 |
2022年 | 387篇 |
2021年 | 713篇 |
2020年 | 469篇 |
2019年 | 645篇 |
2018年 | 22558篇 |
2017年 | 17820篇 |
2016年 | 20023篇 |
2015年 | 1657篇 |
2014年 | 1665篇 |
2013年 | 2163篇 |
2012年 | 8865篇 |
2011年 | 22969篇 |
2010年 | 19805篇 |
2009年 | 12466篇 |
2008年 | 21100篇 |
2007年 | 23327篇 |
2006年 | 2225篇 |
2005年 | 3733篇 |
2004年 | 4857篇 |
2003年 | 5694篇 |
2002年 | 3666篇 |
2001年 | 417篇 |
2000年 | 524篇 |
1999年 | 324篇 |
1998年 | 411篇 |
1997年 | 364篇 |
1996年 | 245篇 |
1995年 | 212篇 |
1994年 | 217篇 |
1993年 | 161篇 |
1992年 | 108篇 |
1991年 | 165篇 |
1990年 | 191篇 |
1989年 | 151篇 |
1988年 | 98篇 |
1987年 | 84篇 |
1986年 | 68篇 |
1985年 | 77篇 |
1984年 | 85篇 |
1983年 | 92篇 |
1982年 | 94篇 |
1981年 | 48篇 |
1980年 | 90篇 |
1979年 | 37篇 |
1976年 | 32篇 |
1974年 | 41篇 |
1938年 | 60篇 |
1932年 | 56篇 |
1930年 | 46篇 |
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
51.
ngela P. de Mattos Tereza C.M. Ribeiro Patrícia S.A. Mendes Sandra S. Valois Carlos M.C. Mendes Hugo C. Ribeiro Jr 《Nutrition Research》2009,29(7):462-469
Although previous studies have shown successful treatment of persistent diarrhea (PD) with the use of yogurt-based diets, some recent ones speculate the need of special formulas for the nutritional management of PD complicated cases. In the present study, we tested the hypothesis that the consumption of 3 lactose-free diets, with different degrees of complexity, is associated with lower stool output and shorter duration of diarrhea when compared with the use of a yogurt-based one on the nutritional management of PD. A total of 154 male infants, aged between 1 and 30 months, with PD and with or without dehydration, were randomly assigned to 1 of 4 treatment groups. Throughout the study, the patients were placed in a metabolic unit; their body weights and intakes of oral rehydration solution, water, and formula diets, in addition to outputs of stool, urine, and vomit, were measured and recorded at 24-hour intervals. Four different diets were used in this study: diet 1, yogurt-based formula; diet 2, soy-based formula; diet 3, hydrolyzed protein-based formula; and diet 4, amino acid–based formula. Throughout the study, only these formula diets were fed to the children. The data showed that children fed the yogurt-based diet (diet 1) or the amino acid–based diet (diet 4) had a significant reduction in stool output and in the duration of diarrhea. The use of an inexpensive and worldwide-available yogurt-based diet is recommended as the first choice for the nutritional management of mild to moderate PD. For the few complicated PD cases, when available, a more complex amino acid–based diet should be reserved for the nutritional management of these unresponsive and severe presentations. Soy-based or casein-based diets do not offer any specific advantage or benefits and do not seem to have a place in the management of PD. 相似文献
52.
Sergio Barroilhet Adrián Cano-Prous Salvador Cervera-Enguix Maria João Forjaz Francisco Guillén-Grima 《Social psychiatry and psychiatric epidemiology》2009,44(12):1051-1065
Introduction
This paper presents the results of a study on the psychometric properties of an authorized Spanish version of the McMaster Family Assessment Device, a self-report measure of family functioning. 相似文献53.
54.
55.
Introduction
Although ependymoma is the third most common pediatric brain tumor, we know little about the genetic/epigenetic basis of its initiation, maintenance, or progression. This is due in part to the heterogeneity of the disease, as well as the small sample size of the cohorts analyzed in most studies. 相似文献56.
Peter Angelos 《World journal of surgery》2009,33(4):609-611
57.
Kentaroh Miyoshi Minoru Naito Tsuyoshi Ueno Shinji Hato Hideo Ino 《General thoracic and cardiovascular surgery》2009,57(11):629-632
A benign esophageal leiomyoma with abnormally increased fluorine-18-fluorodeoxyglucose uptake on positron emission tomography
(PET) was resected thoracoscopically. The tumor, of which the maximum standardized uptake value of the lesion was 4.7, was
well defined and 38 mm in diameter. Neither mitotic activity nor degeneration was found histologically; and immunoreactivity
for CD34, CD117, MIB-1, and glucose transporter-1 was negative immunohistochemically. A diagnosis of gastrointestinal stromal
tumor was ruled out by an oncogenic kinase gene mutation study. This case cautions against PET-dependent evaluation for malignant
potential of esophageal submucosal tumors. 相似文献
58.
59.
Age determines memory for face identity and expression 总被引:1,自引:1,他引:0
Egemen SAVASKAN Sandra Elisabeth MÜLLER reas BÖHRINGER Christine PHILIPPSEN Franz MÜLLER-SPAHN Hartmut SCHÄCHINGER 《Psychogeriatrics》2007,7(2):49-57
Background: The recognition of facial expressions is an important component of emotion processing which contributes to interactional behavior. One of the factors highly associated with potential decline of ability in behavioral tasks is age. Methods: We have investigated age‐related changes in facial identity and expression memory of healthy subjects in three age groups: young adults (20–40 years), elderly adults (60–80 years) and, for the first time in the literature, very old adults (over 80 years of age). Using a picture test, photographs of faces with happy or angry expressions were presented to study participants during the encoding task, and the memory for identity and emotional facial expression was investigated in a subsequent recognition task showing emotionally neutral faces. Half of the faces presented in the recognition task were initially shown in the encoding task. Results: Age interacted with the memory process: the ability to recognize both facial identity and emotional expression declined with advanced age. Happy facial expressions were better recognized in all age groups. Although there was a continuous overall decrease in recognition of both happy and angry expressions with advanced age, the effect favoring happy facial expressions was stable also in very old adults. Other factors such as gender or educational level did not affect the memory process for facial expressions. Conclusions: Our findings suggest that age is a significant determinant of memory for facial identity and emotional expression, and that, similar to younger adults, the recognition process of the elderly favors happy emotional facial expressions. 相似文献
60.
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