Bài đăng

Đang hiển thị bài đăng từ tháng tư, 2018

Đánh giá tác dụng của chế phẩm BB1 trên sự suy sinh dục gây ra bởi Natri Valproat

Hình ảnh
http://repository.vnu.edu.vn/handle/VNU_123/11516

BB1 regimen consists of 2 main herbal constituents (Eurycoma longifolia J. and Polyscias fructicosa). Both plants were identified to exert androgen activity and enhance sexual behavior on rats. 



This study aimed to evaluate sexual protective effect of BB1 against sodium valproate-induced hypogonadism in rats. 
The results showed that BB1 with the dose of 0.47g/kg body weight significantly increased sperm density, sperm motility, and rate of living sperm. 
On morphology of sperms, BB1 formulation increased percentage of normal morphology of sperm, decreased percentage of abnormal in head and tail of sperm. 
In testes histology, there was recovery development of germ cells from the base to the center of the lumen; spermatogonia, primary and secondary spermatocytes, spermatids, and spermatozoa were seen in the lumen of testes of rats in BB1-treated group. 
These results suggest that BB1 with the dose of 0.47g/kg body weight has p…

Photochemical decoration of silver nanoparticles on graphene oxide nanosheets and their optical characterization

Hình ảnh
http://repository.vnu.edu.vn/handle/VNU_123/29630

Nanohybrid materials based on silver nanoparticles (Ag-NPs) and graphene oxide (GO) are attracting considerable research interest because of their potential many applications including surface-enhanced Raman scattering, catalysis, sensors, biomedicine and antimicrobials.


In this study, we established a simple and effective method of preparing a finely dispersed Ag-GO aqueous solution using modified Hummer and photochemical technique.
The Ag-NPs formation on GO nanosheets was analyzed by X-ray diffraction, transmission electron microscopy, Raman spectroscopy, and Fourier-transform infrared spectroscopy.
The average size of Ag-NPs on the GO nanosheets was approximately 6-7 nm with nearly uniform size distribution.
The Ag-GO nanohybrid also exhibits an adsorption band at 435 nm because of the presence of Ag-NPs on the GO nanosheets.
Photoluminescence emission of the Ag-GO nanohybrid was found at 400 and 530 nm, which can be a…