全文获取类型
收费全文 | 380篇 |
免费 | 23篇 |
国内免费 | 1篇 |
专业分类
耳鼻咽喉 | 8篇 |
儿科学 | 20篇 |
妇产科学 | 6篇 |
基础医学 | 78篇 |
口腔科学 | 3篇 |
临床医学 | 51篇 |
内科学 | 51篇 |
皮肤病学 | 3篇 |
神经病学 | 9篇 |
特种医学 | 35篇 |
外科学 | 60篇 |
综合类 | 4篇 |
预防医学 | 16篇 |
眼科学 | 1篇 |
药学 | 40篇 |
中国医学 | 1篇 |
肿瘤学 | 18篇 |
出版年
2023年 | 8篇 |
2022年 | 6篇 |
2021年 | 12篇 |
2020年 | 5篇 |
2019年 | 5篇 |
2018年 | 9篇 |
2017年 | 6篇 |
2016年 | 12篇 |
2015年 | 15篇 |
2014年 | 12篇 |
2013年 | 20篇 |
2012年 | 14篇 |
2011年 | 12篇 |
2010年 | 6篇 |
2009年 | 15篇 |
2008年 | 21篇 |
2007年 | 14篇 |
2006年 | 11篇 |
2005年 | 8篇 |
2004年 | 10篇 |
2003年 | 4篇 |
2002年 | 4篇 |
2000年 | 4篇 |
1999年 | 5篇 |
1998年 | 14篇 |
1997年 | 11篇 |
1996年 | 14篇 |
1995年 | 6篇 |
1994年 | 12篇 |
1993年 | 8篇 |
1992年 | 8篇 |
1991年 | 5篇 |
1990年 | 5篇 |
1989年 | 4篇 |
1988年 | 8篇 |
1987年 | 13篇 |
1986年 | 6篇 |
1985年 | 6篇 |
1984年 | 5篇 |
1983年 | 3篇 |
1982年 | 4篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1977年 | 5篇 |
1975年 | 2篇 |
1972年 | 2篇 |
1964年 | 3篇 |
1962年 | 1篇 |
排序方式: 共有404条查询结果,搜索用时 15 毫秒
51.
Dmitry Permin Olga Postnikova Stanislav Balabanov Alexander Belyaev Vitaliy Koshkin Oleg Timofeev Jiang Li 《Materials》2023,16(1)
This study looked at optimizing the composition of precursors for yttria nanopowder glycine–nitrate self-propagating high-temperature synthesis (SHS). Based on thermodynamic studies, six different precursor compositions were selected, including with excesses of either oxidant or fuel. The powders from the precursors of all selected compositions were highly dispersed and had specific surface areas ranging from 22 to 57 m2/g. They were consolidated by hot pressing (HP) with lithium–fluoride sintering additive and subsequent hot isostatic pressing (HIP). The 1 mm thick HPed ceramics had transmittance in the range of 74.5% to 80.1% @ 1μm, which was limited by optical inhomogeneity due to incomplete evaporation of the sintering additive. Two-stage HIP significantly improves optical homogeneity of the ceramics. It was shown that an excess of oxidizer in the precursor decreases the powders’ agglomeration degree, which forms large pore clusters in the ceramics. 相似文献
52.
Diana Cardenas MD PhD Gustavo Díaz RD MSc Jessika Cadavid ND MSC Fernando Lipovestky MD Marisa Canicoba RD Paola Sánchez MD Ludwig Álvarez ND Yan Duarte MD José Guillermo Gutiérrez Reyes MD Gilda Miranda de Noyola RD Claudia Maza RD Sergio Santana Porbén MD Charles Elleri Bermúdez MD Yawelida García RN Isabel Calvo RD Humberto Arenas MD 《JPEN. Journal of parenteral and enteral nutrition》2022,46(1):229-237
53.
A chimeric protein containing most of the hepatitis B virus preS2 region (amino acid residues 1–48) upstream to, and colinear with the amino-terminus of bluetongue virus VP7 protein (preS2VP7) was expressed by a recombinant Autographa californica nuclear polyhedrosis virus (AcNPV). The chimeric protein formed BTV core-like particles (CLPs) in Spodoptera frugiperda cells only when the cells were coinfected with this recombinant virus and a recombinant baculovirus that expresses unmodified VP7 and VP3 of BTV. The ratio of preS2VP7 incorporated into CLPs was influenced by the relative multiplicities of infection of the two viruses. Immunoelectron microscopy of the chimeric particles indicated that the preS2 epitope was exposed on the surface of the CLPs. When insect cells were coinfected with the preS2 VP7 recombinant virus and a baculovirus vector that synthesized only the VP3 protein, no CLPs were identified. 相似文献
54.
MS Fewtrell G Noble-Jamieson S Revell J Valente P Friend P Johnston A Rasmussen N Jamieson RY Calne ND Barnes 《Archives of disease in childhood》1994,70(6):501-504
One hundred and seventy three children, including 93 with biliary atresia, received liver grafts at Addenbrooke's Hospital between 1983 and 1993. Of these, only seven developed cyanosis due to intrapulmonary shunting as a complication of their liver disease, and all seven of these had the biliary atresia/polysplenia syndrome. Intrapulmonary shunting was confirmed by a radioisotope scan in four children. Only one child with the syndrome did not have cyanosis when undergoing transplantation. Seven of the eight children are alive 6-54 months after transplantation, with normal pulmonary and hepatic function. Cyanosis recurred in one child who developed chronic rejection with liver failure. In conclusion: (a) there is a strong association between the biliary atresia/polysplenia syndrome and cyanosis due to intrapulmonary shunting; (b) intrapulmonary shunting is fully reversible after successful liver transplantation; and (c) cyanosis, once present, is progressive, and these children should be considered for liver transplantation as soon as it occurs. 相似文献
55.
ÖZGE GÜNDÜZ M.D. SIBEL ERSOY‐EVANS M.D. AYŞEN KARADUMAN M.D. 《Pediatric dermatology》2009,26(6):750-751
Abstract: Pityriasis rosea (PR) is an acute, self‐limiting papulosquamous disorder of unknown etiology. Published studies of childhood PR are scarce and most are reviews. The aim of this study was to determine the demographic and clinical features of childhood PR. 相似文献
56.
DB Grant ND Barnes M Dumic M Ginalska-Malinowska PJ Milla W von Petrykowski RJ Rowlatt R Steendijk JH Wales E Werder 《Archives of disease in childhood》1993,68(6):779-782
Review of 20 patients with glucocorticoid deficiency (three cases also with salt loss) associated with absent tear secretion (19 cases) and achalasia of the cardia (15 cases) revealed neurological abnormalities in 17 including hyper-reflexia, muscle weakness, dysarthria, and ataxia together with impaired intelligence and abnormal autonomic function, particularly postural hypotension. These findings indicate that significant neurological problems are common in this multisystem disorder. 相似文献
57.
58.
59.
60.
A. A. Belyaev L. B. Radina N. M. Peretolchina Z. P. Sof'ina G. M. Anoshina 《Pharmaceutical Chemistry Journal》1988,22(2):129-134
Translated from Khimiko-farmatsevticheskii Zhurnal, Vol. 22, No. 2, pp. 180–185, February, 1988. 相似文献