全文获取类型
收费全文 | 2862篇 |
免费 | 186篇 |
国内免费 | 76篇 |
专业分类
耳鼻咽喉 | 21篇 |
儿科学 | 223篇 |
妇产科学 | 57篇 |
基础医学 | 321篇 |
口腔科学 | 71篇 |
临床医学 | 332篇 |
内科学 | 607篇 |
皮肤病学 | 76篇 |
神经病学 | 198篇 |
特种医学 | 409篇 |
外科学 | 244篇 |
综合类 | 59篇 |
预防医学 | 190篇 |
眼科学 | 26篇 |
药学 | 152篇 |
2篇 | |
肿瘤学 | 136篇 |
出版年
2023年 | 7篇 |
2021年 | 33篇 |
2020年 | 22篇 |
2019年 | 30篇 |
2018年 | 59篇 |
2017年 | 38篇 |
2016年 | 37篇 |
2015年 | 52篇 |
2014年 | 69篇 |
2013年 | 93篇 |
2012年 | 86篇 |
2011年 | 95篇 |
2010年 | 120篇 |
2009年 | 108篇 |
2008年 | 84篇 |
2007年 | 132篇 |
2006年 | 82篇 |
2005年 | 91篇 |
2004年 | 57篇 |
2003年 | 51篇 |
2002年 | 57篇 |
2001年 | 69篇 |
2000年 | 54篇 |
1999年 | 51篇 |
1998年 | 141篇 |
1997年 | 163篇 |
1996年 | 140篇 |
1995年 | 114篇 |
1994年 | 126篇 |
1993年 | 104篇 |
1992年 | 46篇 |
1991年 | 48篇 |
1990年 | 48篇 |
1989年 | 68篇 |
1988年 | 57篇 |
1987年 | 55篇 |
1986年 | 61篇 |
1985年 | 57篇 |
1984年 | 38篇 |
1983年 | 28篇 |
1982年 | 31篇 |
1981年 | 35篇 |
1980年 | 30篇 |
1979年 | 11篇 |
1978年 | 14篇 |
1977年 | 21篇 |
1976年 | 34篇 |
1975年 | 17篇 |
1974年 | 6篇 |
1973年 | 7篇 |
排序方式: 共有3124条查询结果,搜索用时 547 毫秒
1.
JM Martín† L Calduch† C Monteagudo‡ I Molina† D Ramón† V Alonso† E Jordᆠ《Journal of the European Academy of Dermatology and Venereology》2006,20(4):428-431
Cutaneous plasmacytosis is a rare disorder characterized by a benign proliferation of mature plasma cells that appears as multiple dark-brown to purplish skin lesions, often associated with polyclonal hypergammaglobulinaemia. We present the case of a 55-year-old Caucasian man who suffered from a cutaneous plasmacytosis associated with two different carcinomas. Cutaneous plasmacytosis seems to be a reactive process because most cases reported are not associated with any apparent underlying disease. Nevertheless, because few reported cases were associated with malignancies, screening of additional neoplasms would be justified. 相似文献
2.
3.
Paul H. Lysaker Louanne W. Davis Gary J. Bryson Morris D. Bell 《Schizophrenia Research》2009,107(2-3):186-191
Designed to help persons with schizophrenia to persist and perform better at job placements, the Indianapolis Vocational Intervention Program (IVIP) is a program of cognitive-behavioral group and individual interventions. While its feasibility has been previously demonstrated, it is unknown whether IVIP assists persons to achieve greater levels of participation in vocational rehabilitation and higher levels of job performance. In this study, 100 participants with schizophrenia or schizoaffective disorder were offered a six month job placement and randomized to receive IVIP (n = 50) or support services (n = 50) matched for treatment intensity. Number of hours worked was recorded weekly and job performance was assessed biweekly using the Work Behavior Inventory with raters blind to condition. t-tests revealed that participants in the IVIP group worked a significantly greater number of weeks than those in the support condition. Also, repeated measures ANOVA revealed the IVIP group worked more hours across that 26 week period as well. And with regards to work performance, repeated measures of the 56 participants who worked for at least two-thirds of the intervention revealed that participants in the IVIP group had generally better work performance than those in the support condition. Results suggest a connection between cognitive-behavioral interventions and higher levels of work performance in people with schizophrenia. 相似文献
4.
JM Vilanova J Figueras-Aloy J Roselló G Gómez E Gelpí R Jiménez 《Acta paediatrica (Oslo, Norway : 1992)》1998,87(5):588-592
The aim of this study was to evaluate the cerebral synthesis of eicosanoids in the asphyctic newborn and to investigate the relation between the prostanoid profiles in cerebrospinal fluid (CSF) and the appearance and severity of hypoxic-ischaemic encephalopathy (HIE). Levels of 6-keto-PGF 1-α, TXB2 , PGE2 and PGF2-α in CSF were measured in 40 full term newborns during the first day of life. Thirty of these newborns had birth asphyxia and were divided into three groups: 10 without HIE, 12 with mild HIE and 8 with moderate-severe HIE. They were compared to a control group of 10 non-hypoxic newborns. Determinations of the metabolites in CSF were performed by RIA and expressed as pg/ml (mean ± SD). The CSF TXB2 (thromboxane A2 metabolite) in asphyxiated newborns was always higher than in the control group (28.12 ± 10.6), and related to the severity of HIE ( p = 0:005): without HIE (50.84 ± 16.4; p = 0:02), mild HIE (80.65 ± 12.64; p ± 0:01) and moderate-severe HIE (178.14 ± 20.5; p < 0:01). The CSF 6-keto-PGF 1-α (prostacyclin metabolite) in asphyxiated newborns was always higher than in the control group (80.55 ± 12.56), but indirectly related to the severity of HIE: without HIE (240.95 ± 28.12; p < 0:01), mild HIE (183.65 ± 30.1; p < 0:01) and moderate-severe HIE (140.55 ± 25.12; p < 0:01). In the moderate-severe HIE group, the increase in TXB2 was higher than the rise in 6-keto-PGF 1-α . 相似文献
5.
6.
Occurrence of the t(2;5)(p23;q35) in non-Hodgkin's lymphoma 总被引:9,自引:3,他引:6
Weisenburger DD; Gordon BG; Vose JM; Bast MA; Chan WC; Greiner TC; Anderson JR; Sanger WG 《Blood》1996,87(9):3860-3868
Primary CD30(Ki-1)-positive anaplastic large-cell lymphoma (ALCL) is considered by some to be a distinct clinicopathologic entity associated with the t(2;5) (p23;q35). However, the specificity of t(2;5) for ALCL has not been carefully studied. Therefore, we performed a detailed analysis of all cases of ALCL with abnormal cytogenetics results in the Nebraska Lymphoma Study Group registry, as well as all other cases of non-Hodgkin's lymphoma with t(2;5) in the registry. We found the t(2;5) in only five of 10 cases of ALCL, four of whom were young patients. However, we also found the t(2;5) in 11 other cases of nonanaplastic lymphoma, including eight children with typical peripheral T-cell lymphomas of various types. The t(2;5) was also found in three older adults with B-cell lymphomas of various types. Thus, the t(2;5) was not specific for CD30+ ALCL. However, t(2;5) may define a clinicopathologic entity in children and young adults characterized by variable morphologies with a T-cell or indeterminate phenotype, CD30-positivity, nodal disease with frequent extranodal involvement, advanced stage, and an excellent response to therapy, including bone marrow transplantation for relapsed disease. The clinical relevance of the t(2;5) in older patients requires further study. 相似文献
7.
8.
9.
10.