全文获取类型
收费全文 | 16134篇 |
免费 | 1025篇 |
国内免费 | 58篇 |
专业分类
耳鼻咽喉 | 123篇 |
儿科学 | 489篇 |
妇产科学 | 472篇 |
基础医学 | 1921篇 |
口腔科学 | 203篇 |
临床医学 | 2367篇 |
内科学 | 3348篇 |
皮肤病学 | 198篇 |
神经病学 | 1514篇 |
特种医学 | 354篇 |
外国民族医学 | 1篇 |
外科学 | 1554篇 |
综合类 | 391篇 |
一般理论 | 19篇 |
预防医学 | 2147篇 |
眼科学 | 300篇 |
药学 | 743篇 |
中国医学 | 17篇 |
肿瘤学 | 1056篇 |
出版年
2023年 | 86篇 |
2022年 | 103篇 |
2021年 | 291篇 |
2020年 | 166篇 |
2019年 | 263篇 |
2018年 | 309篇 |
2017年 | 235篇 |
2016年 | 260篇 |
2015年 | 329篇 |
2014年 | 460篇 |
2013年 | 751篇 |
2012年 | 1057篇 |
2011年 | 1214篇 |
2010年 | 660篇 |
2009年 | 569篇 |
2008年 | 1075篇 |
2007年 | 1129篇 |
2006年 | 1077篇 |
2005年 | 1081篇 |
2004年 | 1063篇 |
2003年 | 981篇 |
2002年 | 911篇 |
2001年 | 174篇 |
2000年 | 173篇 |
1999年 | 202篇 |
1998年 | 228篇 |
1997年 | 162篇 |
1996年 | 149篇 |
1995年 | 127篇 |
1994年 | 122篇 |
1993年 | 108篇 |
1992年 | 116篇 |
1991年 | 97篇 |
1990年 | 92篇 |
1989年 | 90篇 |
1988年 | 88篇 |
1987年 | 57篇 |
1986年 | 67篇 |
1985年 | 67篇 |
1984年 | 75篇 |
1983年 | 89篇 |
1982年 | 78篇 |
1981年 | 79篇 |
1980年 | 70篇 |
1979年 | 59篇 |
1978年 | 55篇 |
1977年 | 45篇 |
1976年 | 45篇 |
1974年 | 35篇 |
1972年 | 34篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
Joan C. Callahan 《The Hastings Center report》1996,26(2):45-46
Book reviewed in this article: Ethics in Obstetrics and Gynecology . By Laurence B. McCullough and Frank A. Chervenak. 相似文献
12.
List of books reviewed. 总被引:1,自引:1,他引:0
Joan Busfield 《Sociology of health & illness》1988,10(4):521-542
Abstract Feminists have been taken to task for suggesting both that the higher level of mental illness observed in women is a consequence of the oppression they face - an oppression which drives them into madness and mental disorder - and also that the concept of mental illness is a social construct inappropriately and incorrectly applied to women by a patriarchal order as a means of social control. This paper examines this supposed contradiction and the ideas that underly the contrasting contentions. It argues that the two positions are not in fact incompatible. 相似文献
13.
14.
Guido Currarino M.D. Bernita Williams M.D. Joan S. Reisch Ph.D. 《Skeletal radiology》1986,15(8):628-630
The length of the thoracic spine was measured in chest roentgenograms of 331 children from birth to 16 years and standards for thoracic spine length in this age group were obtained. 相似文献
15.
Background
Glioblastoma multiforme is the most malignant form of brain tumor. Despite treatment including surgical resection, adjuvant chemotherapy, and radiation, these tumors typically recur. The recurrent tumor is often resistant to further therapy with the same agent, suggesting that the surviving cells that repopulate the tumor mass have an intrinsic genetic advantage. We previously demonstrated that cells selected for resistance to 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU) are near-diploid, with over-representation of part or all of chromosomes 7 and 22. While cells from untreated gliomas often have over-representation of chromosome 7, chromosome 22 is typically under-represented. 相似文献16.
17.
Noah A Goldman Ellen B Katz Alan S Glenn Richard H Weldon Joan G Jones Uticia Lynch Melissa J Fezzari Carolyn D Runowicz Gary L Goldberg Maureen J Charron 《Modern pathology》2006,19(11):1429-1436
Glucose is provided to cells by a family of glucose transport facilitators known as GLUTs. These transporters are expressed in a tissue specific manner and are overexpressed in many primary tumors of these tissues. Regulation of glucose transport facilitator expression has been demonstrated in endometrial tissue and endometrial adenocarcinoma. The following experiments were conducted to quantify and localize the expression of GLUT1 and GLUT8 in benign endometrium and compare this expression to endometrial cancer. Endometrial tissue samples were obtained from random hysterectomy specimens of patients with benign indications for surgery and endometrial cancer. Immunoblot and immunolocatization studies were performed using GLUT1 and GLUT8 specific antisera. Endometrial samples from 65 women who had undergone hysterectomy were examined (n=38 benign, n=27 malignant). A 44 and a 35.4 kDa immunoreacive species was demonstrated in endometrium and endometrial cancer for GLUT1 and GLUT8, respectively. Upregulation of GLUT1 expression was demonstrated with increasing grade of tumors (P<0.002). GLUT8 expression was increased in all tumor subtypes compared to atrophic endometrium (P<0.001). Apical localization by GLUT1 and GLUT8 was demonstrated in endometrial glands. GLUT1 and GLUT8 demonstrated diffuse intracellular localization in the cancer subtypes. GLUT1 and GLUT8 are expressed in both human endometrium and endometrial cancer. There appears to be a step-wise progression in GLUT1 and GLUT8 expression as tumor histopathology worsens. GLUT1 and GLUT8 may be important markers in tumor differentiation, as well as providing energy to rapidly dividing tumor cells. 相似文献
18.
The purpose of the study described in this article was to compare the effectiveness of two bowel training programs for patients who had experienced a cerebrovascular accident (CVA) and to determine the length of time required to establish a regulated program. A quasi-experimental design was used to compare the existing bowel program that incorporated every-other-day digital stimulation (DS) with a program using daily DS. The convenience sample of 48 CVA patients included 23 in the control group who had DS every other day and 25 in the experimental group who had daily DS. Demographic data showed no significant differences between the two groups. The t-test showed that more subjects in the experimental group established regularity; however, the subjects in the control group who did achieve regularity took less time to do it. Subjects with right-side hemiplegia and less mobility required more time to become established. As a result of these findings, the routine protocol for bowel training in this rehabilitation unit has been changed to include daily digital stimulation. 相似文献
19.
F Ledesma Casta?o S Echevarria Vierna J L Lozano Polo R Oloriz Rivas C Alvarez Moreno F Pons Romero 《European journal of clinical nutrition》1992,46(7):527-533
Interleukin-1 (IL-1) is a cytokine produced by the macrophage-monocyte system that has important effects on immunological responses and inflammatory reactions. Several clinical studies have shown that severe protein energy malnutrition adversely effects cell-mediated immune responses and the functional state of macrophages. The objective of this study was to analyse IL-1 production by adherent cells stimulated in vitro with lipopolysaccharide B (LPS) from patients with alcoholic cirrhosis of the liver and its possible relationship with nutritional states. Forty-five patients with alcoholic cirrhosis and 28 healthy donors were investigated. A combined index of nine anthropometric and biochemical parameters was used to evaluate nutritional status of cirrhotic patients, allowing a distinction to be made between those patients with acceptable nutrition (group I: 40%), those with slight malnutrition (group II: 37.7%), and those with severe malnutrition (group III: 22.3%). IL-1 activity was significantly lower in the cirrhosis patients than in the controls (P less than 0.001). This activity also was significantly lower in samples obtained from cirrhotics with severe malnutrition than in those with acceptable nutrition (P less than 0.05); the combined index and the sole anthropometric index gave the same results, suggesting that malnutrition may play a role in the immunoregulatory disturbances in the pathogenesis of alcoholic liver disease. 相似文献
20.
Alex Iranzo Esteban Mu?oz Joan Santamaria Isabel Vilaseca Montserrat Milà Eduardo Tolosa 《Movement disorders》2003,18(10):1179-1183
We evaluated the occurrence of REM sleep behaviour disorder (RBD) and vocal cord abductor paralysis (VCAP) in a group of 9 Machado-Joseph disease (MJD) patients. RBD was diagnosed by clinical history plus audiovisual polysomnography in 4 men and 1 woman (55%). While dreaming, 4 fell out of the bed and the other injured his arms. Laryngoscopy detected bilateral VCAP in 1 patient with stridor who required emergency tracheotomy, and partial vocal cord abductor restriction in 2. RBD and VCAP are two potentially injurious conditions that should be considered part of the clinical spectrum of MJD. 相似文献