全文获取类型
收费全文 | 940篇 |
免费 | 67篇 |
国内免费 | 28篇 |
专业分类
儿科学 | 64篇 |
妇产科学 | 15篇 |
基础医学 | 92篇 |
口腔科学 | 50篇 |
临床医学 | 120篇 |
内科学 | 177篇 |
皮肤病学 | 13篇 |
神经病学 | 19篇 |
特种医学 | 260篇 |
外科学 | 72篇 |
综合类 | 18篇 |
预防医学 | 45篇 |
眼科学 | 5篇 |
药学 | 49篇 |
肿瘤学 | 36篇 |
出版年
2021年 | 5篇 |
2019年 | 6篇 |
2018年 | 18篇 |
2017年 | 7篇 |
2016年 | 7篇 |
2015年 | 15篇 |
2014年 | 18篇 |
2013年 | 12篇 |
2012年 | 12篇 |
2011年 | 19篇 |
2010年 | 35篇 |
2009年 | 23篇 |
2008年 | 11篇 |
2007年 | 31篇 |
2006年 | 23篇 |
2005年 | 14篇 |
2004年 | 11篇 |
2003年 | 19篇 |
2002年 | 13篇 |
2001年 | 14篇 |
2000年 | 14篇 |
1999年 | 20篇 |
1998年 | 60篇 |
1997年 | 71篇 |
1996年 | 79篇 |
1995年 | 47篇 |
1994年 | 38篇 |
1993年 | 44篇 |
1992年 | 19篇 |
1991年 | 14篇 |
1990年 | 21篇 |
1989年 | 41篇 |
1988年 | 41篇 |
1987年 | 31篇 |
1986年 | 32篇 |
1985年 | 31篇 |
1984年 | 9篇 |
1983年 | 10篇 |
1982年 | 12篇 |
1981年 | 10篇 |
1980年 | 12篇 |
1979年 | 4篇 |
1978年 | 4篇 |
1977年 | 13篇 |
1976年 | 13篇 |
1975年 | 8篇 |
1971年 | 3篇 |
1969年 | 3篇 |
1967年 | 2篇 |
1966年 | 2篇 |
排序方式: 共有1035条查询结果,搜索用时 15 毫秒
51.
WPF Fetter J van Hof-van Duin W Baerts DJ Heersema M Wildervanck de Blécourt-Devilée 《Acta paediatrica (Oslo, Norway : 1992)》1992,81(1):25-28
Visual development was studied in 10 very-low-birth-weight infants (less than 1500 g) with retinopathy of prematurity (ROP) stage 3+ who had been treated with cryocoagulation in both eyes. Binocular visual acuity (acuity cards method) and binocular visual fields (kinetic perimetry) were assessed repeatedly in the first year of life. At 12 months corrected age, visual acuity was normal in seven and impaired in three infants, who appeared to be severely myopic. Normal visual fields were found in eight infants at this age. The results indicate that cryotherapy in cases of ROP stage 3+ does not interfere with visual acuity development. The effect on visual field development needs further investigation. 相似文献
52.
53.
54.
The incidence of transient hypogammaglobulinaemia of infancy (THI) detected in a major paediatric centre over a 10 year period was examined. A total of 2468 subjects less than 2 years of age had an IgG measurement taken between July 1979 and March 1990. Subjects with known immunodeficiencies were excluded. Fifteen patients were classified as having THI with an initial IgG level less than the fifth centile followed by a second measurement within the normal range. A further 24 patients were identified as having possible THI with a single low IgG concentration. There were 60,174 live births each year in Victoria in the years 1979-88. This gives an incidence of proved THI of 23 per 10(6) births, and including proved and probable THI an incidence of 61 per 10(6) live births. Of those patients with proved THI 12/15 had symptoms of either atopic disease or food allergy/intolerance and three had gastrointestinal symptoms without any evidence of atopic disease. At presentation 12/15 (80%) were IgA deficient and 9/15 had IgM concentrations less than the 20th centile for age. It is suggested that in view of the preponderance of atopic and food intolerant patients that subclinical protein loss from the bowel due to allergic inflammation may be a contributing factor to the development of THI in some patients. 相似文献
55.
STOTT DJ; MCLELLAN AR; FINLAYSON J; CHU P; ALEXANDER WD 《QJM : monthly journal of the Association of Physicians》1991,78(1):77-84
The clinical and biochemical characteristics of 15 elderly patientswith low levels of thyrotrophin (TSH) (<0.1 mU/L) but normalfree tri-iodothyronine, (T3) and free thyroxine (T4) (groupS) were compared with 10 euthyroid subjects (group E) and 10hyperthyroid patients (group T). Free T3 and free T4 were significantlyhigher (p<0.05) in group S(6.3±0.5 and 18.6±1.0pmol/l, respectively) than in group E(4.6±0.3, 12.6+0.6).In common with elderly hyperthyroid patients (group T)patientsin group S had few signs or symptoms of thyrotoxocosis, butthe Wayne score (clinical index of hyperthyroidism) was higherin group S than in euthyroid subjects (p<0.05). Thyroid microsomal,thyrogolobulin or thyrotrophin receptor antibodies were commonin group T (n=9)but not in groups S(n=2) or E(n=1). This suggestsa low prevalence of Graves' disease in group S compared to groupT. Combined thyrotrophin releasing hormone (TRH; 200 µgi.v.) and gonadotrophin releasing hormone GnRH; 100 µgi.v.) tests were performed; no cases of low TSH due to hypopituitarismwere identified in group S. During a mean of 7.9 (412)months of observation TSH reverted to the normal range (>0.2mU/L)in 7 of 15 patients in group S; thyroid hormone concentrationsrose above the normal range in four, however, only two patientsrequired treatment for hyperthyroidism. It is unlikely thatthe suppressed TSH of patients in group S was due to mild thyroidhormone excess; although this is often a transitory phenomenon,these patients are at increased risk of developing overt hyperthyroidism. 相似文献
56.
57.
58.
59.
60.