One-step hydrothermal synthesis of g-C

In this work, a ternary composite photocatalyst with layer structure was synthesized by a one-step hydrothermal method. The visible-light-driven layered ternary photocatalyst exhibited excellent photocatalytic performance for the degradation of tetracycline (TC). The degradation rate of TC reached 88.78% within 60 min under visible light exposure in presence of optimum ratio G-T-B-0.2, which is higher than pure g-C3N4, TiO2 and BiOBr. Scaning electron microscope (SEM), Transmission electron microscope (TEM), Xray diffractometer (XRD), Fourier transform infrared spectra (FTIR), spectrometer and X-ray photoelectron spectroscopy (XPS) were used to character the physicochemical properties of the synthesized samples. Photoelectrochemical measurements and radical trapping experiments revealed that the improvement of photocatalytic performance was mainly attributed to the rapid charge transfer at the interface of gC3N4/TiO2/BiOBr, which was benefit to the separation of photogenerated carriers and visible light absorption. This work provides a facile method for the synthesis of ternary heterojunctions, which has potential applications in environmental remediation

Positive selection of human cells lacking several transformation parameters from an SV40-transformed culture by means of parvovirus H-1

The simian virus 40 (SV40)-transformed, newborn human kidney cell line NB-F was found to be heterogenous with respect to its sensitivity to parvovirus H-1. The majority of the cells sustain a productive H-1 infection which eventually causes their lysis. Yet, a small fraction of the cells appears to be much less susceptible to H-1. Such a resistance to H-1 infection is a stable, transmissible property of this sub-population of cells which was denoted NB-FR. The heterogeneity of NB-F cells is also apparent from the distribution of their karyotypes, which is bimodal and peaks at 114 and 46 chromosomes/cell. In contrast, the great majority of NB-FR cells contain 41-50 chromosomes. H-1-resistant and sensitive cells appear to be related in several respects: they both contain morphologically human chromosomes as well as multiple SV40 DNA inserts, and could not be distinguished by isoenzyme typing. It was investigated whether the degree of sensitivity to H-1 infection correlated with other phenotypic properties of the human cell derivatives. NB-F cultures exhibit a series of transformation parameters, such as SV40 T-antigen expression, poor contact inhibition, clonogenicity in semi-solid medium and high lectin agglutinability, which are all much reduced or even undetectable in NB-FR cells. These observations suggest that cell susceptibility to H-1 segregates with marker(s) of in vitro malignant transformation. Moreover, the data indicate that parvoviruses can be used to preferentially remove transformants from a mixed culture of normal and transformed cells. © 1988 IRL Press Ltd.SCOPUS: ar.jinfo:eu-repo/semantics/publishe