全文获取类型
收费全文 | 1855642篇 |
免费 | 129820篇 |
国内免费 | 4250篇 |
专业分类
耳鼻咽喉 | 24021篇 |
儿科学 | 62015篇 |
妇产科学 | 51695篇 |
基础医学 | 261772篇 |
口腔科学 | 53638篇 |
临床医学 | 164191篇 |
内科学 | 362406篇 |
皮肤病学 | 42380篇 |
神经病学 | 141183篇 |
特种医学 | 72712篇 |
外国民族医学 | 339篇 |
外科学 | 281222篇 |
综合类 | 40302篇 |
现状与发展 | 4篇 |
一般理论 | 536篇 |
预防医学 | 138109篇 |
眼科学 | 43906篇 |
药学 | 134982篇 |
9篇 | |
中国医学 | 4742篇 |
肿瘤学 | 109548篇 |
出版年
2019年 | 13647篇 |
2018年 | 23174篇 |
2017年 | 18763篇 |
2016年 | 19562篇 |
2015年 | 23268篇 |
2014年 | 30025篇 |
2013年 | 41008篇 |
2012年 | 61415篇 |
2011年 | 59783篇 |
2010年 | 34839篇 |
2009年 | 34135篇 |
2008年 | 53549篇 |
2007年 | 57440篇 |
2006年 | 58073篇 |
2005年 | 62776篇 |
2004年 | 62497篇 |
2003年 | 55843篇 |
2002年 | 49647篇 |
2001年 | 94929篇 |
2000年 | 94969篇 |
1999年 | 81076篇 |
1998年 | 20291篇 |
1997年 | 17573篇 |
1996年 | 17714篇 |
1995年 | 17069篇 |
1994年 | 15586篇 |
1993年 | 14329篇 |
1992年 | 62479篇 |
1991年 | 60583篇 |
1990年 | 58492篇 |
1989年 | 56043篇 |
1988年 | 51082篇 |
1987年 | 49673篇 |
1986年 | 46835篇 |
1985年 | 44085篇 |
1984年 | 32090篇 |
1983年 | 27203篇 |
1982年 | 14728篇 |
1979年 | 28585篇 |
1978年 | 19478篇 |
1977年 | 16389篇 |
1976年 | 15125篇 |
1975年 | 16603篇 |
1974年 | 20177篇 |
1973年 | 19204篇 |
1972年 | 17941篇 |
1971年 | 16716篇 |
1970年 | 15542篇 |
1969年 | 14620篇 |
1968年 | 13569篇 |
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
991.
992.
993.
994.
From early childhood, two brothers had mild gait difficulties due to acid maltase deficiency (AMD). Biochemical studies of family members were consistent with autosomal recessive inheritance, but the asymptomatic mother had AM activity in the homozygote range, and her parents had decreased AM activity. The asymptomatic mother may be homozygous for the adult-onset variant of AMD. Alternatively, either the mother or the children may be genetic compounds of the childhood and adult forms of AMD. 相似文献
995.
P A Fantoni C Baroni G Lazzarini M Astuni S Tognoli V Barbieri 《Minerva chirurgica》1986,41(10):923-930
996.
997.
Etiological heterogeneity in Hodgkin's disease: HLA linked and unlinked determinants of susceptibility independent of histological concordance 总被引:2,自引:0,他引:2
Forty-one multiplex families, from published sources and new data from the National Cancer Institute, segregating for Hodgkin's disease and HLA, have been studied. A reanalysis of these data strongly suggests a recessive mode of inheritance for susceptibility to Hodgkin's disease. The HLA haplotype sharing data between affected relatives demonstrate that approximately 60% of cases in multiplex families are due to an HLA-linked susceptibility gene, the remaining 40% being due to other familial factors. The data clearly support the hypothesis of etiological heterogeneity for Hodgkin's disease, with both HLA-linked and HLA-unlinked factors being responsible. Finally, there is an increased concordance of histological types between affected relatives, but this concordance seems independent of HLA sharing. 相似文献
998.
S Makino T Nakojo Y Tsuchida K Hashizume M Nakajima K Atsumi J Tulip 《Journal of pediatric surgery》1986,21(3):240-243
A combination of Photo Radiation Therapy (PRT) using Argon-Dye Laser with hematoporphyrin derivatives (HpD) was used experimentally on a cytogenetically highly malignant neuroblastoma xenograft, which exhibited a homogeneously staining region and caused DNA amplifications in chromosomes. The tumor tissue was treated with 500 joules/cm2 of laser. The dosage of HpD was 50 mg per kg body weight. Necrosis of over 50% of the tumor was observed in half the specimens. Swollen cytoplasmic organelles and ruptured cell and nuclear membranes were observed by electron microscopy after PRT. PRT may be used with other treatment modalities for the removal of residual and metastatic tumors. 相似文献
999.
Traumatic infarction of the spinal cord in children 总被引:2,自引:0,他引:2
J U Choi H J Hoffman E B Hendrick R P Humphreys W S Keith 《Journal of neurosurgery》1986,65(5):608-610
Infarction of the spinal cord in childhood is rarely due to trauma. During a 15-year period (1971 to 1985), eight children were admitted to The Hospital for Sick Children, Toronto, with a diagnosis of traumatic infarction of the spinal cord. All of these patients had delayed onset of neurological signs varying between 2 hours and 4 days after their initial trauma. No bone abnormalities were seen on plain spine x-ray films. Myelography was carried out in seven of these children and found to be normal in all seven. Six patients who were paraplegic at the time of admission remained permanently paraplegic, but two with incomplete cord signs did show some improvement. 相似文献
1000.