全文获取类型
收费全文 | 1808篇 |
免费 | 82篇 |
国内免费 | 26篇 |
专业分类
耳鼻咽喉 | 27篇 |
儿科学 | 98篇 |
妇产科学 | 23篇 |
基础医学 | 201篇 |
口腔科学 | 120篇 |
临床医学 | 105篇 |
内科学 | 340篇 |
皮肤病学 | 62篇 |
神经病学 | 75篇 |
特种医学 | 142篇 |
外科学 | 264篇 |
综合类 | 108篇 |
一般理论 | 1篇 |
预防医学 | 57篇 |
眼科学 | 25篇 |
药学 | 131篇 |
1篇 | |
中国医学 | 11篇 |
肿瘤学 | 125篇 |
出版年
2023年 | 13篇 |
2022年 | 31篇 |
2021年 | 57篇 |
2020年 | 24篇 |
2019年 | 46篇 |
2018年 | 63篇 |
2017年 | 35篇 |
2016年 | 40篇 |
2015年 | 44篇 |
2014年 | 57篇 |
2013年 | 98篇 |
2012年 | 123篇 |
2011年 | 101篇 |
2010年 | 86篇 |
2009年 | 88篇 |
2008年 | 74篇 |
2007年 | 113篇 |
2006年 | 90篇 |
2005年 | 63篇 |
2004年 | 57篇 |
2003年 | 49篇 |
2002年 | 41篇 |
2001年 | 28篇 |
2000年 | 29篇 |
1999年 | 26篇 |
1998年 | 31篇 |
1997年 | 37篇 |
1996年 | 44篇 |
1995年 | 26篇 |
1994年 | 17篇 |
1993年 | 25篇 |
1992年 | 10篇 |
1991年 | 17篇 |
1990年 | 7篇 |
1989年 | 25篇 |
1988年 | 19篇 |
1987年 | 18篇 |
1986年 | 19篇 |
1985年 | 18篇 |
1984年 | 20篇 |
1983年 | 14篇 |
1982年 | 10篇 |
1981年 | 5篇 |
1980年 | 10篇 |
1979年 | 10篇 |
1978年 | 14篇 |
1977年 | 8篇 |
1976年 | 8篇 |
1975年 | 6篇 |
1970年 | 3篇 |
排序方式: 共有1916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.
3.
4.
5.
6.
Genotype-phenotype correlation for nucleotide substitutions in the IgII- IgIII linker of FGFR2 总被引:6,自引:3,他引:3
7.
8.
Influence of some sugars was studied on activity of purified cellulase enzymes produced by two white-rot basidiomycetes cultures in submerged fermentation. Exo- and endo-glucanases were found to be stimulated by glucose, sucrose and xylose, but β-glucosidase was inhibited by all sugars tested except sucrose being neutral. Cellobiose severely inhibited all three cellulase activities at all three concentrations taken in reaction mixture. 相似文献
9.
Localization of a gene for otosclerosis to chromosome 15q25-q26 总被引:5,自引:0,他引:5
Tomek MS; Brown MR; Mani SR; Ramesh A; Srisailapathy CR; Coucke P; Zbar RI; Bell AM; McGuirt WT; Fukushima K; Willems PJ; Van Camp G; Smith RJ 《Human molecular genetics》1998,7(2):285-290
Among white adults otosclerosis is the single most common cause of hearing
impairment. Although the genetics of this disease are controversial, the
majority of studies indicate autosomal dominant inheritance with reduced
penetrance. We studied a large multi- generational family in which
otosclerosis has been inherited in an autosomal dominant pattern. Five of16
affected persons have surgically confirmed otosclerosis; the remaining nine
have a conductive hearing loss but have not undergone corrective surgery.
To locate the disease- causing gene we completed genetic linkage analysis
using short tandem repeat polymorphisms (STRPs) distributed over the entire
genome. Multipoint linkage analysis showed that only one genomic region, on
chromosome 15q, generated a lod score >2.0. Additional STRPs were typed
in this area, resulting in a lod score of 3.4. STRPs FES (centromeric) and
D15S657 (telomeric) flank the 14. 5 cM region that contains an otosclerosis
gene.
相似文献
10.
A study of the degree of progesterone support required for the maintenance
of various stages of pregnancy was undertaken in mice. Mated females were
ovariectomized at various stages of pregnancy and progesterone and
oestradiol support provided by s.c. Silastic implants with known release
characteristics. In the earliest stages of pregnancy (days 1-5), very low
concentrations of progesterone (<25% of normal physiological values)
were sufficient to maintain pre-implantation stages and allow implantation.
In the immediate post-implantation period (days 5-9), the development of
implantation sites and decidualization required considerably higher
progesterone support. In mid-pregnancy (days 11-14), progesterone alone
could not maintain pregnancy unless present in very high amounts; however,
the presence of oestradiol during this period lowered the progesterone
requirements to well within the physiological range. This effect of
oestradiol started on day 11 but required the level of oestradiol support
to be kept within strictly defined limits, with high concentrations
inducing abortion. Progesterone alone was able to maintain pregnancy from
day 15. These results indicate that the minimal progesterone support
required for pregnancy in mice varies considerably at different stages of
pregnancy and is at least partly modulated by oestradiol.
相似文献