全文获取类型
收费全文 | 182033篇 |
免费 | 1326篇 |
国内免费 | 20篇 |
专业分类
耳鼻咽喉 | 1256篇 |
儿科学 | 6856篇 |
妇产科学 | 3075篇 |
基础医学 | 17189篇 |
口腔科学 | 1626篇 |
临床医学 | 12893篇 |
内科学 | 32181篇 |
皮肤病学 | 790篇 |
神经病学 | 16939篇 |
特种医学 | 9198篇 |
外科学 | 29991篇 |
综合类 | 2450篇 |
一般理论 | 4篇 |
预防医学 | 18325篇 |
眼科学 | 3054篇 |
药学 | 9978篇 |
中国医学 | 650篇 |
肿瘤学 | 16924篇 |
出版年
2023年 | 67篇 |
2022年 | 176篇 |
2021年 | 326篇 |
2020年 | 162篇 |
2019年 | 259篇 |
2018年 | 22152篇 |
2017年 | 17537篇 |
2016年 | 19729篇 |
2015年 | 1122篇 |
2014年 | 1159篇 |
2013年 | 1167篇 |
2012年 | 7537篇 |
2011年 | 21610篇 |
2010年 | 19107篇 |
2009年 | 11792篇 |
2008年 | 19861篇 |
2007年 | 22093篇 |
2006年 | 901篇 |
2005年 | 2510篇 |
2004年 | 3660篇 |
2003年 | 4653篇 |
2002年 | 2698篇 |
2001年 | 332篇 |
2000年 | 451篇 |
1999年 | 209篇 |
1998年 | 247篇 |
1997年 | 242篇 |
1996年 | 112篇 |
1995年 | 133篇 |
1994年 | 116篇 |
1993年 | 76篇 |
1992年 | 63篇 |
1991年 | 109篇 |
1990年 | 146篇 |
1989年 | 97篇 |
1988年 | 56篇 |
1987年 | 50篇 |
1986年 | 30篇 |
1985年 | 32篇 |
1984年 | 25篇 |
1982年 | 27篇 |
1980年 | 42篇 |
1970年 | 24篇 |
1969年 | 25篇 |
1938年 | 60篇 |
1937年 | 25篇 |
1935年 | 22篇 |
1934年 | 30篇 |
1932年 | 56篇 |
1930年 | 47篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
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13.
Nand L. Sharma Vikram K. Mahajan Neelam Gupta Nitin Ranjan and Anju Lath 《Journal of cutaneous pathology》2009,36(4):486-492
Ehlers-Danlos syndrome – vascular type, the only lethal form, is rarely reported in dermatology literature. It is characterized by translucent, atrophic skin, easy bruising, arterial, intestinal and/or uterine fragility manifesting as varicose veins, aneurysms and vascular/visceral/uterine rupture. As its dermatopathologic features are not well elucidated, diagnosis is often made after a catastrophic complication or at autopsy. This 36 year-old non-consanguineous male had brown-black plaques with atrophy and frequent ulceration over legs and dorsal feet and tortuous varicose veins around ankles for the past 15 years. Perivenous skin was translucent and hypopigmented. He had multiple and ecchymotic keloids and small atrophic, pityriasis versicolor-like lesions over trunk. He did not have hypermobile/hyperextensible skin and joints and showed no systemic or investigative abnormality. Histopathologic features of atrophic lesion included blood extravasation in atrophic epidermis/dermis, focal clustering and dilatation of blood vessels, malformed vessel walls, abundant hemosiderin in the dermis and homogenously stained/whorled patterned collagen especially around blood vessels. Pathology of keloidal lesion showed new collagen and vascular fragility. These histopathologic features appear of diagnostic value especially in patients who have compatible clinical findings but cannot afford confirmation by biochemical testing for abnormal synthesis of type III procollagen or identification of mutations in the COL3A1 gene. 相似文献
14.
15.
16.
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17.
Peter Angelos 《World journal of surgery》2009,33(4):609-611
18.
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
19.
20.
Preclinical and clinical investigations currently underway are employing novel strategies for combining vaccines with conventional and experimental anticancer therapies. To date, the FDA has not approved a therapeutic cancer vaccine. However, the results of recent investigations suggest an increasing role for vaccines in new models of combination therapy for many types of cancer. This article reviews and discusses therapeutic cancer strategies that employ vaccines in combination with local radiation, chemotherapy, hormone therapy, and anti-CTLA-4 mAb. Preclinical studies have shown that certain anticancer agents have immune modulatory effects that result in up-regulation of surface expression of MHC molecules, tumor-associated antigens, or Fas on malignant cells, rendering them more susceptible to immune destruction. Preliminary results of clinical studies using combination strategies have demonstrated a postvaccination antigen cascade, prolonged time to disease progression, and improved overall survival. Several larger randomized trials are ongoing, and more are required to support these findings. 相似文献