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19. Investigation of Bi2Te2.88Se0.12 bulk single crystal produced using Bridgman method

Author

Požega Emina, Bernik Slavko, Marjanović Saša, Petrović Ana, Svrkota Igor, Stojić Anđela, and Simonović Danijela

Subjects
bulk single crystal, bridgman method, hall and van der pauw method, thermoelectric properties, doping, Chemical technology, TP1-1185
Abstract

As part of research on the influence of selenium as dopant on bismuth telluride, a successful synthesis of single crystal was carried out. Single crystal of p type conductivity, with the given compound formula, Bi2Te2.88Se0.12, was obtained by the Bridgman process. The obtained empirical formula does not deviate from the given compound formula. Single crystal was characterized by Hall Effect system based on the Van der Pauw method. Also, bulk sample was characterized by Seebeck coefficient (S), thermal conductivity (κ) and electrical resistivity (ρ) measurements, as а function of temperature in the range of 40-320°C by а homemade impedance meter. The prepared single crystal has a figure of merit (Z) of 2.16 x 10-3 K-1 at 40°C. Values of ZT are about 1.0 at 27°C for commercialized p and n type of bismuth telluride ingots. T is absolute temperature.

Published
2024
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41. Short-term effect of acarbose on specific intestinal disaccharidase activities and hyperglycaemia in CBA diabetic mice

Author

Mirko Hadzija, Jana Lukac-Bajalo, Roberta Petlevski, Dubravka Juretić, Cop L, and Bernik S

Subjects
Blood Glucose, Male, medicine.medical_specialty, Ileum, Diabetes Mellitus, Experimental, Jejunum, Sucrase, Mice, Random Allocation, Food Animals, Internal medicine, medicine, Animals, Hypoglycemic Agents, Glycoside Hydrolase Inhibitors, Enzyme Inhibitors, Acarbose, Dose-Response Relationship, Drug, Chemistry, digestive, oral, and skin physiology, alpha-Glucosidases, Disaccharidase, Small intestine, Intestines, medicine.anatomical_structure, Endocrinology, acarbose, disaccharidase, diabetes mellitus, Hyperglycemia, Mice, Inbred CBA, Duodenum, Animal Science and Zoology, Maltase, medicine.drug
Abstract

The purpose of this study was to examine the short-teml effects of 75, 100 and 150 mg of acarbose mixed in 100 9 standard laboratory chow on specific intestinal disaccharidase activities and on hyperglycaemia in diabetic CBA strain mice on standard diet. The small intestine was excised and divided into three segments, from pylorus to duodenum, and two equal lengths of the jejunum and ileum of control and diabetic mice with or without added acarbose. Specific maltase and sucrose activities were detemlined using maltose and sucrose as substrates respectively. Increased specific activities of maltase and sucrose were detected in the intestines of CBA mice on standard laboratory diet seven days after alloxan-induced diabetes. Feeding for 7 days with 75, 100 or 150 mg acarbose uniformly mixed in 1 00 9 standard laboratory chow , induced a decrease in the specific maltase and sucrase activities, compared with diabetic mice on standard laboratory diet. Feeding with 75 mg acarbose mixed in 1 00 9 standard laboratory chow caused a statistically significant decrease of maltase in the duodenum and of sucrose in duodenum and jejunum, without a antihyperglycaemic effect. Feeding with 100 or 150 mg caused statistically significant decreases in specific maltase and sucrose activities in duodenum, jejunum and ileum. An antihyperglycaemic effect was observed only in the group of diabetic mice fed with 100 mg acarbose. This indicates that the antihyperglycaemic effect of acarbose involves factors other than these, related only to its inhibitory effect on disaccharidase activities.

Published
2003
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46. Synthesis of pure and doped LaMnO3 powders from citrate precursors

Author

Djuris, K., Branković, Goran O., Brankovic, Z., Bernik, S., Pocuca, M., Poleti, Dejan, and Antić, Bratislav

Subjects
powders, microstructure, pechini method, lanthanum manganite
Abstract

In this work pure and doped LMO were prepared using modified Pechini method from lanthanum and manganese citrates. Lanthanum citrate was prepared starting from La2O3, while manganese citrate was prepared from Mn(NO3)(2). Valence state of the manganese was controlled by adjusting pH value of the solution and confirmed by EPR and UV/VIS analysis. Thermal treatment conditions for preparation of LMO powders were determined from TG/DTA of dried precursors. XRD results confirmed that pure perovskite phase was successfully prepared in single LMO and Ca-doped LMO. SEM and measurements of specific surface area of the powders showed the existence of large agglomerates consisting of submicronic primary particles. Research Trends in Contemporary Materials Science, 8th Conference of the Yugoslav-Materials-Research-Society (Yu-MRS), Sep 04-08, 2006, Herceg Novi, Montenegro

Published
2007

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