全文获取类型
收费全文 | 456篇 |
免费 | 14篇 |
国内免费 | 29篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 29篇 |
妇产科学 | 9篇 |
基础医学 | 30篇 |
口腔科学 | 11篇 |
临床医学 | 40篇 |
内科学 | 86篇 |
皮肤病学 | 16篇 |
神经病学 | 12篇 |
特种医学 | 56篇 |
外科学 | 64篇 |
综合类 | 63篇 |
预防医学 | 12篇 |
眼科学 | 9篇 |
药学 | 40篇 |
肿瘤学 | 20篇 |
出版年
2023年 | 1篇 |
2022年 | 4篇 |
2021年 | 5篇 |
2020年 | 3篇 |
2019年 | 6篇 |
2017年 | 1篇 |
2016年 | 3篇 |
2015年 | 8篇 |
2014年 | 12篇 |
2013年 | 11篇 |
2012年 | 14篇 |
2011年 | 21篇 |
2010年 | 24篇 |
2009年 | 25篇 |
2008年 | 22篇 |
2007年 | 23篇 |
2006年 | 25篇 |
2005年 | 15篇 |
2004年 | 11篇 |
2003年 | 7篇 |
2002年 | 6篇 |
2001年 | 8篇 |
2000年 | 5篇 |
1999年 | 6篇 |
1998年 | 29篇 |
1997年 | 35篇 |
1996年 | 32篇 |
1995年 | 18篇 |
1994年 | 13篇 |
1993年 | 18篇 |
1992年 | 5篇 |
1990年 | 5篇 |
1989年 | 11篇 |
1988年 | 5篇 |
1987年 | 9篇 |
1986年 | 3篇 |
1985年 | 13篇 |
1984年 | 5篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1981年 | 6篇 |
1980年 | 1篇 |
1978年 | 4篇 |
1977年 | 2篇 |
1975年 | 3篇 |
1973年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1966年 | 3篇 |
1965年 | 1篇 |
排序方式: 共有499条查询结果,搜索用时 31 毫秒
21.
Ageing appearance in China: biophysical profile of facial skin and its relationship to perceived age
AE Mayes PG Murray DA Gunn CC Tomlin SD Catt YB Wen LP Zhou HQ Wang M Catt SP Granger 《Journal of the European Academy of Dermatology and Venereology》2010,24(3):341-348
Background Perceived age is important to women and is a primary driver for topical product use and facial cosmetic surgery. Changes in facial features and biophysical skin parameters with chronological age and their associations with perceived age have not been described in Asian populations. Objective To investigate the relationship between biophysical properties of the skin, visual features of skin ageing and perceived facial age in Chinese women. Methods Facial photographs were collected of 250 Chinese women, aged 25–70 years in Shanghai, China. The perceived facial age was determined and related to the chronological age for each participant and to a range of visual assessments of skin appearance and objective biophysical measurements of the skin. The profile of changes in these parameters with age was investigated together with the differences in those parameters for women judged to look younger than their chronological age and those judged to look older than their chronological age. Results Large discrepancies in perceived age (up to 29 years) were found in women of the same chronological age. Each objective skin measure and visual assessment parameter had a stronger correlation with perceived age than with chronological age. The strongest relationships to perceived age were for wrinkles and hyperpigmentation. Skin colour, hydration and trans‐epidermal water loss (TEWL) had weaker associations with perceived age. Women judged to look older than their chronological age had significantly higher scores than those judged to look younger for coarse wrinkles and hyperpigmentation across all age groups. The appearance differences between these groups were evident in composite facial images of the same average chronological age. Conclusions We have identified the skin attributes which differ with perceived age in Chinese women. Perceived age is a better measure of the biological age of facial skin than is chronological age in this population. 相似文献
22.
23.
M. P. Desai M. P. Colaco A. R. Ajgaonkar C. V. Mahadik F. E. Vas C. Rege V. V. Shirodkar A. Bandivdekar A. R. Sheth 《Indian journal of pediatrics》1987,54(4):571-581
Neonatal screening in India poses more organisational and socio-economic rather than medical challenges. Based on the pilot
study of 450 cord sera, the plan for screening considered cord TSH<30 μU/ml as normal, 30 to 80 as borderline with recall
by letters and >80 as indicative of hypothyroid state, with recall by home visits. Of the 17,240 live births only 12,407 cord
sera were collected. Envisaging follow-up difficulties, T4 was assayed in cord sera when TSH was>30 μ U/ml. 2·81% (350) babies needed recall. Only 30% of 302 (2·43%) babies with cord
TSG 30 to 80 responded, to recall letters and were normal; availability of both cord TSH and T4 helped in excluding hypothyroidism in majority of non-respondents. Forty-eight (0·38%) newborns had TSH>90 μU/ml; 80% of
this group and 100% with TSH> 100 μU/ml were traced by home visits. Hypothyroidism was confirmed in 5/48, biochemically and
by thyroid scan. All five hypothyroids had cord TSH>300 μU/ml. The incidence in this nonendemic region of India was 1∶2481.
Thus false elevation of cord TSH 30 to 300 μU/ml was noted in 0·34% with a chance of detecting a hypothyroid 1 in 10 when
TSH>80 μU/ml. Screening strategies in a developing country must ensure meticulous clerical assistance, co-operation and education
of nurses and parents, precise and cost effective technics and facilities for continued surveilance of detected hypothyroids. 相似文献
24.
背景:阿德福韦双酯(ADV) 是一种有效治疗野生型和耐拉米夫定乙肝病毒(HBV)的核苷酸类药物。在使用核苷酸类药物治疗慢性乙肝时,当治疗时间为 48、96、144周时,耐ADV变异体出现的累积发生率分别为0、 0.8-3%和0-5.9%。目的:研究67例对拉米夫定耐药且接受ADV治疗的慢性乙肝患者耐ADV病毒变异体的表型和基因型特点。方法:HBV DNA含量采用实时定量PCR技术。ADV变异体检测采用基质辅助激光解吸电离/飞行时间质谱为基础的基因分型 相似文献
25.
26.
27.
I n spite of a great deal of work in the field of plastic surgery of the fallopian tubes, the problem still remains largely unsolved and presents a challenge to the ingenuity of every gynaecologist. 相似文献
28.
Treatment of allergic bronchopulmonary aspergillosis (ABPA) has remained both problematic as well as controversial. Although the sheet anchor in treatment of ABPA still remains steroids, various workers have tried oral antifungals (fluconazole and itraconazole) with encouraging results. This study evaluates the effect of fluconazole or itraconazole in the treatment of ABPA patients and compares them with the patients who had received palliative therapy other than antifungals. Case records of 44 proven cases of ABPA treated at our referral service hospital during February 1998 to April 2001 were analyzed. In addition to oral and inhaled bronchodilators, 16 patients received fluconazole 150 mg OD and 13 patients itraconazole 200 mg OD for six months. Response to therapy was assessed clinically, radiologically and by spirometry every 3 months. Patients who did not receive antifungals had chronic course characterized by airway obstruction, recurrent pulmonary consolidation and obstructive defect on pulmonary function test (PFT). Patients treated with itraconazole had better control of asthma symptoms, less requirement of reliever inhalers, steroids and lesser exacerbations of asthma during follow-up even after stopping antifungal. Fluconazole group had better control of symptoms but improvement in other parameters was not statistically significant. From this study it was evident that itraconazole improved the symptoms of airway obstruction, pulmonary functions, pulmonary opacities and decreased exacerbations during follow up.Key Words: Allergic bronchopulmonary aspergillosis, Fluconazole, Itraconazole 相似文献
29.
Accuracy of fetal echocardiography 总被引:6,自引:0,他引:6
The reliability of prenatal ultrasound (US) for the detection of structural heart defects was investigated in a consecutive population of patients referred for prenatal US. Twenty-eight of 49 fetuses (57%) shown to have one or more heart defects with physical examination or autopsy were found to have congenital heart disease with prenatal US. There were 66 cardiac defects in 49 fetuses, 33 of which were entirely or partly identified (50%). Defects correctly diagnosed included hypoplasia of either ventricle, common atrioventricular canal, tetralogy of Fallot, transposition of the great vessels, and Ebstein anomaly. Defects rarely diagnosed correctly included semilunar valve stenosis, total anomalous pulmonary venous drainage, coarctation of the aorta, pulmonic atresia, atrioseptal defect, and ventricular septal defect. Many types of heart defects can be diagnosed accurately with prenatal US in a general population of patients not at high risk for congenital heart disease. Some lesions, however, were difficult to detect. 相似文献
30.