Glassy carbon electrodes modified with gelatin functionalized reduced graphene oxide nanosheet for determination of gallic acid

A simple approach for the preparation of gelatin functionalized reduced graphene oxide nanosheet (Gel-RGONS) by chemical reduction of graphene oxide (GO) using gelatin as both reducing agent and stabilizing agent in an aqueous solution was developed. The morphology and structure of the Gel-RGONS were examined by X-ray diffraction, transmission electron microscopy, ultraviolet-visible spectroscopy and Raman spectroscopy. Gelatin acted as a functionalizing reagent to guarantee good dispersibility and stability of the r in distilled water. Moreover, a new electrochemical sensor was developed based on Gel-RGONS modified glassy carbon electrode (Gel-RGONS/GCE). Gel-r exhibits excellent electrocatalytic activity to gallic acid (GA) oxidation. The experimental conditions such as pH, adsorption time and scan rate were optimized for the determination of GA. Under optimum conditions, the sensor responded linearly to GA in the concentration of 1.0 x 10(-6) to 1.1 x 10(-4) M with detection limit of 4.7 x 10(-7) M at 3 sigma using linear sweep voltammetry (LSV). The method has been successfully applied to the determination of GA in sample of black tea

From Pliny to Brexit: spatial representation of the British Isles

This essay explores the representation of the British Isles on maps and related geographical texts over the course of the Middle Ages. Emphasizing the classical basis for representation of the islands, it examines articulations of insular identity in the debate over the date of Easter as presented in Bede’s Ecclesiastical History, in Gerald of Wales’ Topographia Hiberniae, and in later medieval maps of various genres, including mappaemundi, regional maps, and portolan charts. It concludes with brief reflections on the contemporary crisis of insular identity manifest in the 2016 referendum on the United Kingdom’s membership of the European Union

Systematic review and meta-analysis of circulatory disease from exposure to low-level ionizing radiation and estimates of potential population mortality risks

Background: Although high doses of ionizing radiation have long been linked to circulatory disease, evidence for an association at lower exposures remains controversial. However, recent analyses suggest excess relative risks at occupational exposure level

Systematic review and meta-analysis of circulatory disease from exposure to low-level ionizing radiation and estimates of potential population mortality risks

Background: Although high doses of ionizing radiation have long been linked to circulatory disease, evidence for an association at lower exposures remains controversial. However, recent analyses suggest excess relative risks at occupational exposure level

MORBIDITY AND MORTALITY AMONG EMERGENCY WORKERS OF THE CHERNOBYL ACCIDENT: ASSESSMENT OF RADIATION RISKS FOR THE FOLLOW-UP PERIOD OF 1992-2008

Morbidity and mortality among emergency workers of the Chernobyl accident for the follow- up period of 199Morbidity and mortality among the emergency workers of the Chernobyl accident for the follow-up period of 1992-2008 is analyzed in the article. The cohort consists of 47141 emergency workers of 1986-1987. Radiation risks for cancer morbidity (ERR/Gy is 0.76; 95% CI: 0.19; 1.42, p-value=0008) and cancer mortality (ERR/Gy is 0.95; 95% CI: 0.19; 1.89, p-value=0.01) are statistically significant. Radiation risk for vascular diseases is assessed as well