Rational design of self-assembled surfactant film in nanopipettes: a combined fluorescence and electrochemical sensing

Herein, a generalizable method based on the formation of self-assembled surfactant film was reported to build a nanopipette system, which was applicable for both ionic current and fluorescent analysis of...

Evaluation of Trace Elements in Thyroid Adenomas Using Energy Dispersive X-Ray Fluorescent Analysis

Thyroid adenomas (TA) are benign tumors, but there is a 20% possibility of malignant transformation. The distinguishing between the TA and thyroid cancer (TC) is tricky, therefore new TA biomarkers are needed. Furthermore, the role of trace elements (TE) in etiology and pathogenesis of TA is unclear. The aim of this exploratory study was to examine the content of bromine (Br), cooper (Cu), iron (Fe), rubidium (Rb), strontium (Sr), and zinc (Zn) in the normal and in adenomatous thyroid. Thyroid tissue levels of six TE were prospectively evaluated in 19 patients with TA and 105 healthy inhabitants. Measurements were performed using 109Cd radionuclide-induced energy-dispersive X-ray fluorescent analysis Tissue samples were divided into two portions. One was used for morphological study while the other was intended for TE analysis. It was found that contents of Br and Cu were significantly higher (25.8 and 4.16 times, respectively) and content of Sr were significantly lower (39%) in adenomatous thyroid in comparison with normal level. There are considerable changes in TE contents in the adenomatous thyroid.

Study of the chemical composition of Amir Wali coins by x-ray fluorescent analysis

The chemical composition of seven coins of Amir Wali of six dirhams par value (two types) minted in Astarabad in 769 and 75 Hijri (1368 and 1374 AD) was studied by x-ray fluorescent analysis using a portable TRACER 5i spectrometer. There were established the basic composition of the coin alloy and the quantitative content of the trace elements. The performed comparison with the coin alloys compositions of the preceding dynasties demonstrated continuity of minting technologies and similarity of ore sources used in the production of dirhams during the reign of Amir Wali in Astarabad. Based on the literary data of galenic ores composition mined in the Zenjan province, it is suggested that the raw material for coin mintage was extracted from a deposit located near the city of Damgan.

Studies on Fluorescent Analysis of Two Ethnomedicinal Plants Duranta erecta L. and Phyla nodiflora (L.) Greene

The fluorescent studies on two ethnomedicinal plants belongs to family Verbenaceae , Duranta erecta L. and Phyla nodiflora (L.) Greene. The present study will assist in standardization for quality, purity and sample identification. The etnomedicinal plants were analysed using standard methods.. The fluorescence analysis for two ethno-medicinal plants were conducted by using the visible light and ultra violet at 254nm and 354 nm, reveals the various colouration ranges from sea weed green to berry blue coloured highlighted compared with the source , Lularoe chart. The present study concludes that the data obtained can be used to authenticate, classify and standardize the above four ethno-medicinal plants. Keywords: Ethnomedicinal plants, fluorescent study, UV wavelength.

An analysis of geochemical features of crystallization of emeralds as an approach to determine the deposit of them

Relevance. It is known that minerals differ in morphology, features of the internal structure of crystals, chemical composition, etc., depending on the conditions of their formation and existence. These geochemical features of the gems crystallization are an important criterion for determining their deposit. In this paper, the impurity composition of the samples of emeralds from the deposits of Brazil, China, Zambia, Russia, Afghanistan, Colombia, and Tanzania was investigated by X-ray fluorescent analysis. The study of the impurity composition of emeralds by a non-destructive method and the construction of analytical dependences can be used as an additional way for determining the deposit of emeralds. Purpose of the work is the study of chemical composition of emeralds by X-ray fluorescent analysis to establish the relationship between the content of the main impurity elements and the deposit. Results. The data on the impurity composition of emeralds obtained by X-ray fluorescent analysis show that the content of impurities of Na, K, Rb, Cs, Mg, Fe, V, Cr differs from one deposit to another. The content of impurities of alkali metals and magnesium is higher in the samples from the shale-type deposits compared to the samples from deposits of the Colombian type. Thus, at the first stage, the type of deposit can be assumed. Further, the dependences plotted in the coordinate planes {Cr, V}, {Cs, Cr}, {Fe, Cr} show separate areas, delimited by the impurity ratios, which are typical for the samples from deposits in China, Colombia, Zambia, Afghanistan, and Tanzania. Conclusion. X-ray fluorescent analysis, as a non-destructive method for studying emeralds, is considered to be a promising approach to identifying their deposit, but as an additional method.