全文获取类型
收费全文 | 845篇 |
免费 | 53篇 |
出版年
2022年 | 8篇 |
2021年 | 14篇 |
2020年 | 11篇 |
2019年 | 20篇 |
2018年 | 22篇 |
2017年 | 18篇 |
2016年 | 27篇 |
2015年 | 32篇 |
2014年 | 22篇 |
2013年 | 42篇 |
2012年 | 42篇 |
2011年 | 46篇 |
2010年 | 18篇 |
2009年 | 19篇 |
2008年 | 25篇 |
2007年 | 35篇 |
2006年 | 18篇 |
2005年 | 31篇 |
2004年 | 36篇 |
2003年 | 27篇 |
2002年 | 24篇 |
2001年 | 20篇 |
2000年 | 27篇 |
1999年 | 17篇 |
1998年 | 10篇 |
1997年 | 7篇 |
1996年 | 8篇 |
1995年 | 8篇 |
1994年 | 11篇 |
1993年 | 12篇 |
1992年 | 9篇 |
1991年 | 11篇 |
1990年 | 13篇 |
1989年 | 21篇 |
1988年 | 15篇 |
1987年 | 19篇 |
1986年 | 10篇 |
1985年 | 11篇 |
1983年 | 13篇 |
1982年 | 7篇 |
1979年 | 10篇 |
1978年 | 11篇 |
1977年 | 7篇 |
1976年 | 7篇 |
1975年 | 13篇 |
1974年 | 9篇 |
1972年 | 6篇 |
1971年 | 5篇 |
1967年 | 9篇 |
1966年 | 7篇 |
排序方式: 共有898条查询结果,搜索用时 31 毫秒
31.
Alcohol feeding (40% of total calories over a period of 9 days) increases microsomal cortisol-5 alpha-reductase activity in rat liver distinctly. It is assumed that this is an adaptive response to an increased release of cortisol caused by alcohol administration. Cortisol-5 alpha-reductase activity is decreased to one third of control values in rats fed an isocaloric, low protein diet. The response to alcohol feeding is susta ined in these animals. Phenobarbital treatment (80 mg/kg x day) stimulates 5 alpha-reduction of cortisol per g of microsomes almost twofold. The activity calculated per total liver increases 4-fold. Alcohol administration has no additional effect on cortisol-5alpha-reductase in phenobarbital-treated rats. 相似文献
32.
33.
34.
Cholecystokinin-8 like immunoreactivity (CCK-8 IR) was measured in different brain regions of rats with experimental liver cirrhosis. A statistically significant reduction of CCK-8 content was observed in the hypothalamus of cirrhotic rats. No significant modification of brain CCK fractionation pattern was observed in treated animals as compared to controls. The decrease of CCK-8 IR parallels the recently reported hypothalamic depletion of beta endorphin in cirrhotic rats confirming that central neuropeptides are affected by chronic liver failure. 相似文献
35.
Enumeration of rabbit reticulocyte ribosomal proteins 总被引:11,自引:0,他引:11
36.
37.
38.
Arianna Martini Ann Huysseune P. Eckhard Witten Clara Boglione 《Journal of fish biology》2021,98(4):971-986
The teleost zebrafish (Danio rerio), an established model for human skeletal diseases, is reared under controlled conditions with defined parameters for temperature and photoperiod. Studies aimed at defining the proper rearing density have been performed with regard to behavioural and physiological stress response, sex ratio and reproduction. Studies concerning the effect of rearing density on the skeletal phenotype are lacking. This study analyses the response of the skeleton to different rearing densities and describes the skeletal deformities. Wild-type zebrafish were reared up to 30 dpf (days post-fertilization) in a common environment. From 30 to 90 dpf, animals were reared at three different densities: high density (HD), 32 fish l–1; medium density (MD), 8 fish l–1 and low density (LD), 2 fish l–1. Animals at 30 and 90 dpf were collected and whole-mount stained with Alizarin red S to visualize mineralized tissues. The entire skeleton was analysed for meristic counts and 172 types of deformities. The results showed that the rearing density significantly influenced the specimens’ average standard length, which decreased with the increase in the rearing density. Differences in meristic counts among the three groups were not observed. Rearing density–independent malformations affected the ribs, neural arches and the spines of the abdominal region, as well as vertebrae of the caudal complex. The HD group showed the highest number of deformities per specimen, the highest number of observed types of deformities and, together with the MD group, the highest frequency of specimens affected by severe deformities. In particular, the HD group showed deformities affecting arches, spines and vertebral centra in the caudal region of the vertebral column. This study provides evidence of an effect of the rearing density on the development of different skeletal phenotypes. 相似文献
39.
Martini Claudia Sosa Fernando Nicolas Malvicini Ricardo Pacienza Natalia Yannarelli Gustavo del C. Vila María 《Journal of physiology and biochemistry》2021,77(4):601-611
Journal of Physiology and Biochemistry - Alendronate, a bisphosphonate used to prevent osteoporosis, stimulates osteogenesis but impairs adipogenesis. Different clinical trials suggest that the... 相似文献
40.
D. Martini A. Trirè L. Breschi A. Mazzoni G. Orsini G. Teti M. Falconi A. Ruggeri Jr. 《European journal of histochemistry : EJH》2013,57(4)
Dentin matrix protein 1 (DMP1) and dentin sialophosphoprotein (DSPP) are extracellular matrix proteins produced by odontoblasts involved in the dentin mineralization. The aim this study was to compare the distribution of DMP1 and DSPP in human sound dentin vs human sclerotic dentin. Sixteen sound and sixteen carious human molars were selected, fixed in paraformaldehyde and processed for immunohistochemical detection of DMP1 and DSPP by means of light microscopy, transmission electron microscopy (TEM) and high-resolution field emission in-lens scanning electron microscopy (FEI-SEM). Specimens were submitted to a pre-embedding or a post-embedding immunolabeling technique using primary antibodies anti DMP1 and anti-DSPP and gold-conjugated secondary antibodies. Other samples were processed for the detection of DMP1 and DSPP levels. Dentin from these samples was mechanically fractured to powder, then a protein extraction and a protein level detection assay were performed. DMP1 and DSPP were more abundant in carious than in sound samples. Immunohistochemical analyses in sclerotic dentin disclosed a high expression of DMP1 and DSPP inside the tubules, suggesting an active biomineralization of dentin by odontoblasts. Furthermore, the detection of small amounts of these proteins inside the tubules far from the carious lesion, as shown in the present study, is consistent with the hypothesis of a preventive defense of all dentin after a noxious stimulus has undermined the tooth.Key words: sclerotic dentin, dentin matrix protein, dentin sialophosphoprotein, immunohistochemistry 相似文献