全文获取类型
收费全文 | 1462篇 |
免费 | 70篇 |
国内免费 | 6篇 |
专业分类
耳鼻咽喉 | 11篇 |
儿科学 | 124篇 |
妇产科学 | 73篇 |
基础医学 | 165篇 |
口腔科学 | 17篇 |
临床医学 | 98篇 |
内科学 | 203篇 |
皮肤病学 | 51篇 |
神经病学 | 167篇 |
特种医学 | 87篇 |
外科学 | 229篇 |
综合类 | 16篇 |
一般理论 | 1篇 |
预防医学 | 54篇 |
眼科学 | 66篇 |
药学 | 103篇 |
中国医学 | 1篇 |
肿瘤学 | 72篇 |
出版年
2022年 | 26篇 |
2021年 | 46篇 |
2020年 | 19篇 |
2019年 | 34篇 |
2018年 | 47篇 |
2017年 | 22篇 |
2016年 | 28篇 |
2015年 | 34篇 |
2014年 | 37篇 |
2013年 | 46篇 |
2012年 | 76篇 |
2011年 | 76篇 |
2010年 | 45篇 |
2009年 | 25篇 |
2008年 | 61篇 |
2007年 | 51篇 |
2006年 | 38篇 |
2005年 | 41篇 |
2004年 | 57篇 |
2003年 | 47篇 |
2002年 | 48篇 |
2001年 | 38篇 |
2000年 | 38篇 |
1999年 | 35篇 |
1997年 | 13篇 |
1995年 | 17篇 |
1994年 | 14篇 |
1992年 | 14篇 |
1991年 | 30篇 |
1990年 | 22篇 |
1989年 | 17篇 |
1988年 | 22篇 |
1987年 | 23篇 |
1986年 | 24篇 |
1985年 | 22篇 |
1984年 | 17篇 |
1983年 | 18篇 |
1982年 | 13篇 |
1981年 | 17篇 |
1980年 | 14篇 |
1979年 | 21篇 |
1978年 | 16篇 |
1977年 | 15篇 |
1974年 | 13篇 |
1973年 | 13篇 |
1972年 | 13篇 |
1971年 | 11篇 |
1968年 | 17篇 |
1967年 | 16篇 |
1966年 | 16篇 |
排序方式: 共有1538条查询结果,搜索用时 15 毫秒
61.
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
62.
63.
Crystal structure of neotame anhydrate polymorph G 总被引:1,自引:0,他引:1
Dong Z Young VG Sheth A Munson EJ Schroeder SA Prakash I Grant DJ 《Pharmaceutical research》2002,19(10):1549-1553
Purpose. To determine the crystal structure of the neotame anhydrate polymorph G and to evaluate X-ray powder diffractometry (XRPD) with molecular modeling as an alternative method for determining the crystal structure of this conformationally flexible dipeptide.
Methods. The crystal structure of polymorph G was determined by single crystal X-ray crystallography (SCXRD) and also from the X-ray powder diffraction (XRPD) pattern using molecular modeling (Cerius2 , Powder Solve module).
Results. From SCXRD, polymorph G crystals are orthorhombic with space group of P212121 with Z = 4, unit cell constants: a = 5.5999(4), b = 11.8921(8), c = 30.917(2) Å, and one neotame molecule per asymmetric unit. The XRPD pattern of polymorph G, analyzed by Cerius2 software, led to the same P212121 space group and almost identical unit cell dimensions. However, with 13 rigid bodies defined, Cerius2 gives a conformation of the neotame molecule, which is different from that determined by SCXRD.
Conclusions. For neotame anhydrate polymorph G, the unit cell dimensions calculated from XRPD were almost identical to those determined by SCXRD. However, the crystal structure determined by XRPD closely resembled that determined by SCXRD, only when the correct conformation of the neotame molecule had been chosen before detailed analysis of the XRPD pattern. 相似文献
64.
Sheth RD 《Journal of child neurology》2002,17(Z2):2S23-2S27
Approximately one third of new cases of epilepsy have their onset before age 20 years. Many children will enter adolescence with epilepsy or have an onset of seizures during adolescence. Adolescence is a time of dramatic change in growth, hormonal, psychologic, and social situations. Seizure frequency, teenage pregnancy, driving, and alcohol and drug use often become major issues during the adolescent years. Furthermore, adolescents often have difficulty accepting the chronicity of epilepsy and complying with medications, which can result in physical injury and perceived or real obstacles to employment, thereby contributing to low morale. Both pediatricians and neurologists should be aware of adolescent issues in epilepsy. 相似文献
65.
66.
Topical steroids play an extremely important role in the treatment of various dermatologic conditions. Use of topical steroids must be approached with caution, however, as they can have serious side effects. We report a case of iatrogenic perianal ulcers caused by twice-daily application of Lotrisone (clotrimazole and betamethasone dipropionate) in the perianal region. High-potency topical steroids should be used sparingly and briefly in intertriginous areas. 相似文献
67.
68.
69.
70.