全文获取类型
收费全文 | 1563篇 |
免费 | 82篇 |
国内免费 | 26篇 |
专业分类
耳鼻咽喉 | 14篇 |
儿科学 | 85篇 |
妇产科学 | 20篇 |
基础医学 | 172篇 |
口腔科学 | 42篇 |
临床医学 | 145篇 |
内科学 | 287篇 |
皮肤病学 | 18篇 |
神经病学 | 61篇 |
特种医学 | 161篇 |
外科学 | 196篇 |
综合类 | 57篇 |
预防医学 | 215篇 |
眼科学 | 13篇 |
药学 | 98篇 |
中国医学 | 1篇 |
肿瘤学 | 86篇 |
出版年
2022年 | 19篇 |
2021年 | 80篇 |
2020年 | 27篇 |
2019年 | 41篇 |
2018年 | 48篇 |
2017年 | 21篇 |
2016年 | 21篇 |
2015年 | 50篇 |
2014年 | 39篇 |
2013年 | 59篇 |
2012年 | 51篇 |
2011年 | 57篇 |
2010年 | 49篇 |
2009年 | 49篇 |
2008年 | 63篇 |
2007年 | 72篇 |
2006年 | 75篇 |
2005年 | 69篇 |
2004年 | 63篇 |
2003年 | 52篇 |
2002年 | 36篇 |
2001年 | 30篇 |
2000年 | 32篇 |
1999年 | 32篇 |
1998年 | 35篇 |
1997年 | 38篇 |
1996年 | 44篇 |
1995年 | 31篇 |
1994年 | 24篇 |
1993年 | 28篇 |
1992年 | 15篇 |
1991年 | 15篇 |
1990年 | 14篇 |
1989年 | 40篇 |
1988年 | 23篇 |
1987年 | 31篇 |
1986年 | 20篇 |
1985年 | 23篇 |
1984年 | 26篇 |
1983年 | 10篇 |
1982年 | 8篇 |
1981年 | 11篇 |
1980年 | 10篇 |
1979年 | 11篇 |
1978年 | 8篇 |
1977年 | 7篇 |
1976年 | 11篇 |
1975年 | 13篇 |
1972年 | 6篇 |
1967年 | 6篇 |
排序方式: 共有1671条查询结果,搜索用时 15 毫秒
1.
Coronary artery bypass grafts: visualization with MR imaging 总被引:1,自引:0,他引:1
2.
William M. Chadduck Duc H. Duong John M. Kast David J. Donahue 《Child's nervous system》1995,11(10):579-583
Cerebellar hemorrhage is a devastating condition with morbidity and mortality related not only to the etiology of the hemorrhage, but also to the timing of the intervention. Sixteen consecutive pediatric patients with acute cerebellar hemorrhages are presented: 6 had vascular abnormalities, 3 had tumors, and 2 had hemorrhages of unknown etiology. Thirteen of the 16 patients survived with only 1 of the 13 having persistent vegetative state as a neurologic outcome. Six of 8 patients presenting in a moribund condition had good outcomes, and 3 of 4 patients presenting with fixed and dilated pupils also had good outcomes. Thus, in contrast to adults, rapid evaluation by CT scanning, followed by the judicious use of ventricular drainage and prompt surgical treatment, have resulted in favorable outcomes in pediatric patients despite their poor clinical presentations. None of the neonates having cerebellar hemorrhages required surgical intervention; their courses could be followed clinically and with transfontanel ultrasound.Presented as a poster at the 14th Congress of the European Society for Paediatric Neurosurgery, Lyon, France, 21–23 September 1994, and the XXII Annual Meeting of the International Society for Pediatric Neurosurgery, Birmingham, UK, 25–28 September 1994 相似文献
3.
4.
5.
6.
The authors report their experience of percutaneous nephrolithotomy over a period of three years. The analysis of the first 250 cases performed reveals a low morbidity, with serious complications in 1% of cases, and an acceptable complete success rate of 83%. The indications for percutaneous nephrolithotomy have been modified since the opening of an extracorporeal lithotripsy unit. The choice between the two techniques depends on their efficacy and their expected morbidity based on four criteria: the volume, chemical composition and site of the stone and the morphology of the upper urinary tract. Percutaneous nephrolithotomy is the treatment of choice for large stones (greater than 2.5 cm), hard stones or those formed proximally to a stenotic lesion of the urinary tract, which can then be dilated at the same procedure. A combination of the two methods is sometimes uses to treat staghorn calculi with a success rate of 80%. On the other hand, very large staghorn calculi with caliceal branches are best treated by open surgery. 相似文献
7.
Since the last two decades, rapid progress has been made in the field of cancer immunotherapy relevant to manipulation of adaptative cytotoxic T lymphocytes (CTLs) and innate immunity natural killer (NK) cells as well as antibodies. Many possibilities are now offered for therapeutic purposes contributing to better approaches in treatment of cancer. 相似文献
8.
Genotype-phenotype correlation for nucleotide substitutions in the IgII- IgIII linker of FGFR2 总被引:6,自引:3,他引:3
9.
10.
C Duc I Barakat-Walter E Philippe B Droz 《Brain research. Developmental brain research》1991,59(2):209-219
The expression of substance P (SP) was studied in sensory neurons of developing chick lumbosacral dorsal root ganglia (DRG) by using a mixture of periodic acid, lysine and paraformaldehyde as fixative and a monoclonal antibody for SP-like immunostaining. The first SP-like-immunoreactive DRG cells appeared first at E5, then rapidly increased in number to reach a peak (88% of ganglion cells) at E8, and finally declined (59% at E12, 51% after hatching). The fall of the SP-like-positive DRG cells resulted from two concomitant events affecting a subset of small B-neurons: a loss of neuronal SP-like immunoreactivity and cell death. After one hindlimb resection at an early (E6) or late (E12) stage of development (that is before or after establishment of peripheral connections), the DRG were examined 6 days later. In both cases, a drastic neuronal death occurred in the ispilateral DRG. However, the resection at E6 did not change the percentage of SP-like-positive neurons, while the resection at E12 severely reduced the proportion of SP-like-immunoreactive DRG cells (25%). In conclusion, connections established between DRG and peripheral target tissues not only promote the survival of sensory neurons, but also control the maintenance of SP-like-expression. Factors issued from innervated targets such as NGF would support the survival of SP-expressing DRG cells and enhance their SP content while other factors present in skeletal muscle or skin would hinder SP expression and therefore lower SP levels in a subset of primary sensory neurons. 相似文献