全文获取类型
收费全文 | 5322篇 |
免费 | 359篇 |
国内免费 | 81篇 |
专业分类
耳鼻咽喉 | 16篇 |
儿科学 | 243篇 |
妇产科学 | 74篇 |
基础医学 | 705篇 |
口腔科学 | 89篇 |
临床医学 | 648篇 |
内科学 | 1201篇 |
皮肤病学 | 113篇 |
神经病学 | 303篇 |
特种医学 | 555篇 |
外科学 | 782篇 |
综合类 | 62篇 |
一般理论 | 2篇 |
预防医学 | 307篇 |
眼科学 | 62篇 |
药学 | 348篇 |
2篇 | |
中国医学 | 3篇 |
肿瘤学 | 247篇 |
出版年
2023年 | 25篇 |
2022年 | 29篇 |
2021年 | 63篇 |
2020年 | 60篇 |
2019年 | 82篇 |
2018年 | 96篇 |
2017年 | 80篇 |
2016年 | 78篇 |
2015年 | 105篇 |
2014年 | 111篇 |
2013年 | 180篇 |
2012年 | 188篇 |
2011年 | 193篇 |
2010年 | 165篇 |
2009年 | 148篇 |
2008年 | 192篇 |
2007年 | 235篇 |
2006年 | 208篇 |
2005年 | 183篇 |
2004年 | 141篇 |
2003年 | 132篇 |
2002年 | 157篇 |
2001年 | 154篇 |
2000年 | 151篇 |
1999年 | 148篇 |
1998年 | 170篇 |
1997年 | 206篇 |
1996年 | 166篇 |
1995年 | 149篇 |
1994年 | 137篇 |
1993年 | 126篇 |
1992年 | 93篇 |
1991年 | 110篇 |
1990年 | 110篇 |
1989年 | 96篇 |
1988年 | 110篇 |
1987年 | 108篇 |
1986年 | 108篇 |
1985年 | 105篇 |
1984年 | 78篇 |
1983年 | 65篇 |
1982年 | 54篇 |
1981年 | 60篇 |
1980年 | 48篇 |
1979年 | 48篇 |
1978年 | 35篇 |
1977年 | 44篇 |
1976年 | 41篇 |
1975年 | 33篇 |
1970年 | 23篇 |
排序方式: 共有5762条查询结果,搜索用时 15 毫秒
1.
2.
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
3.
4.
Relation between energy expenditure and body composition in man: specific energy expenditure in vivo of fat and fat-free tissue 总被引:2,自引:0,他引:2
L Garby J S Garrow B J?rgensen O Lammert K Madsen P S?rensen J Webster 《European journal of clinical nutrition》1988,42(4):301-305
The relationship between energy expenditure and body composition, in terms of fat and fat-free masses, has previously been described by a variety of predictive regression equations with parameters devoid of physiological content. We present here results obtained by calculating the specific energy expenditure, ie, the energy expenditure per unit of mass, of fat and fat-free tissue on the basis of measurements of the total energy expenditure (EE), the masses of fat (FM), and fat-free (FFM) tissue using the following simple model: EE = k1.FM + k2.FFM where k1 and k2 are the specific energy expenditures of fat and fat-free tissue, respectively. The results of observations on 104 women at rest yielded values for k1 and k2 of 0.31 and 1.35 watts/kg of fat and fat-free mass, respectively, with standard errors of estimate of 0.074 and 0.052 watts/kg, respectively. Analysis of several series of measurements, from other sources and on smaller samples of subjects, yielded similar values at rest but with larger standard errors of estimate. Data from subjects performing varying amounts of work in 24-h measurements showed, as expected, larger values for both tissues. The results explain to a very large extent the well-established relation between resting metabolic rate and body weight, ie, a linear relation with a non-zero intercept. The results also offer a clear-cut explanation for the well known difference in energy expenditure between men and women with the same body weight. 相似文献
5.
Fixation of displaced femoral neck fractures: A comparison between sliding screw plate and four cancellous bone screws 总被引:1,自引:0,他引:1
Frank Madsen Frank Linde Erik Andersen Hanne Birke Inge Hvass Torben D. Poulsen 《Acta orthopaedica》1987,58(3):212-216
In a prospective, randomized trial, 104 consecutive patients with displaced femoral neck fractures were allocated either to fixation with a sliding screw plate or 4 ASIF cancellous bone screws. The patients were reexamined at fixed intervals to determine the time of union. The 2-year-cumulated rate of union was 64 per cent in the plate group and 84 per cent in the screw group. 相似文献
6.
F. Madsen 《Clinical and experimental allergy》2006,36(6):850-851
7.
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
8.
9.
O A Madsen 《World health forum》1988,9(1):24-28
Health meassages have long been carried on stamps, cancellations and special envelopes. Some postal administrations are particularly active in using stamps as a medium for messages. Others seem to be quite inactive. Perhaps some health ministries, and other interested parties, have not fully understood the enormous potential for health education which exists here. Stamps and frankings can be a major inexpensive source of information about health and other subjects. If those interested in promoting health were to use the full potential of stamps for this purpose, health for all would be 1 step closer to being achieved. The accompanying illustrations show that the health message can take many forms. 相似文献
10.
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