Biosynthesis of reduced graphene oxide nanosheets and their in vitro cytotoxicity against cardiac cell lines of Catla catla.

This work reports a one-step simple synthesis method for functionalized reduced graphene oxide (RGO) nanosheets by a Platanus orientalis leaf extract polyphenol-mediated deoxygenation of graphene oxide (GO). Microscopic and spectroscopic characterization revealed the successful deoxygenation of GO and subsequent stabilization by oxidized polyphenols of plant extract. X-ray photoelectron spectroscopy, Raman spectroscopy, and X-ray diffraction analyses were used to examine the reduction of GO. Fourier-transform infrared spectroscopy results revealed capping of RGO with oxidized polyphenols of Platanus orientalis extract, which prevented aggregation of graphene sheets. Transmission electron microscopy and atomic force microscopy images revealed the formation of thin, transparent, sheet-like graphene. The in vitro cytotoxicity of synthesized RGO exhibited a dose-dependent toxicity against cardiac cell lines of Catla catla. Further, this work opens up a green synthesis route for the development of new graphene-based technologies.

Growth status of children under 7 years in Wuzhong City, Ningxia Hui Autonomous Region, China and its influential factors / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To investigate the growth status of children under 7 years in Wuzhong City, Ningxia Hui Autonomous Region, China and its influential factors, and to provide a basis for related intervention measures.</p><p><b>METHODS</b>Children under 7 years were selected from two county-level districts in Wuzhong by stratified cluster sampling, and their growth status were evaluated by the Z score method.</p><p><b>RESULTS</b>The prevalence rates of growth retardation, underweight, and wasting were 12.58%, 5.71%, and 5.55% respectively. The height-for-age Z score, weight-for-age Z score, and weight-for-height Z scores were -0.26±2.50, 0.29±4.54. and 0.65±3.02 respectively. There were significant differences in the prevalence rate of wasting among children of different ethnic groups (P<0.05); also, there were significant differences in the prevalence rates of growth retardation and underweight among children from different regions and with different age (P<0.05). The main influential factors for growth retardation were region (OR=0.369, P<0.001), ethnic groups (OR=1.694, P=0.027), and age (OR=1.143, P=0.002). The main influential factors for underweight were region (OR=0.453, P=0.001) and age (OR=1.204，P=0.002). The main influential factor for wasting was nation (OR=1.735, P=0.024).</p><p><b>CONCLUSIONS</b>In Wuzhong, children under 7 years have poor growth status, which are related to ethnic groups, region, and age.</p>