Physicochemical Characterization of Natural Wollastonite and Calcite

Wollastonite and calcite minerals are significant raw materials and are extensively used due to their unique properties. Wollastonite is used in plastics, paint, ceramics, paper, resins, and in construction as a substitution for asbestos due to its chemical stability, thermal resistivity, needle-like shape, and brightness. Calcite is one of the most used raw materials because of its low hardness, high alkalinity, sorptive properties, white and bright color. Wollastonite and calcite are two minerals found together in nature. The most common method used for separating these two minerals is flotation. In this study, the surface properties of pure mineral samples were investigated. The pH profiles of both minerals were obtained by measuring the surface charge of particles followed by the measurement of the zeta potential in different collector concentrations. The wettability of minerals was examined by measuring their contact angles

Congenital lobar emphysema: Is surgery routinely necessary?

Congenital lobar emphysema (CLE) is a rare congenital abnormality characterised by overinflation of a pulmonary lobe. Its aetiology is unknown. The management of CLE has traditionally been surgical. A newborn boy with a birthweight of 2.5 kg was delivered at full-term by caesarian section due to food delivery. There was no marked respiratory distress at birth, and little meconium stained liquor was seen on the skin. The initial diagnosis was meconium aspiration syndrome. After computed tomography of the thorax, CLE was diagnosed. The patient was observed throughout for a week and the CT of the thorax was repeated, which revealed that the emphysema had resolved. The nonoperative approach should be considered in asymptomatic patients with CLE

Recovery from complex ore by floatation

The lead-zinc ore sample containing 3.45% Pb, 3.15% Zn, 12.2 g/t Au and 256 g/t Ag was subjected to this experimental study and taken from Bolkardağ-Niğde, south eastern part of Anatolia. According to the mineralogical studies, the representative ore sample contains primarily native gold, electrum, native silver, and argentojarosite as gold and silver minerals, cerusite, anglesite, galena, pyromorphite, mimetite and plumbojarosite as lead minerals, smithsonite, hydrozincite, hemimorphite, adamite and sphalerite as zinc minerals, limonite, hematite, goethite, pyrite, magnetite and siderite as lead minerals and quartz, feldspar, albite and muscovite as gangue minerals. Beneficiation of complex lead and zinc ore was investigated using flotation method. Various parameters such as particle size, flotation stages, collector type, collector amount, control reagents were investigated to recover of gold and silver bearing minerals. At the end of the experimental studies, the flotation experiments performed with Aero 208 + Aerophine 3418 A (350 + 350 g/t) collectors at pH 4.5 gave the best result. –38 microns particle size and 1000 g/t of Na2SiO3 as depressant were used at these conditions. At the end of the experiments, a process was designed for evaluation of the ore. According to the process, a concentrate having 920 g/t Au and 10100 g/t Ag can be obtained with the recoveries of 54.1% and 31.1%, respectively

Crystal structure of 1-ferrocenyl-(3-methyl-1-phenyl-aziridin-2-yl)-methanone, (C5H5)Fe(C16H16NO)

C21H21FeNO, monoclinic, P12(1)/alpha 1 (no. 14), a = 7.329(7) angstrom, b = 17.343(3) angstrom, c = 13.618(5) angstrom beta = 95.02 degrees, V = 1724.3 angstrom(3), Z = 4, R-gt(F) = 0.044, wR(ref)(F-2) = 0. 111, T = 293 K

CHERNOBYL-DERIVED RADIOCESIUM IN MOSSES IN THE BLACK-SEA AREA

Radiocesium (Cs-134 and Cs-137) activity levels in mosses from the Black Sea area, northern Turkey, are reported following the Chernobyl accident during the period of 1989-1991. The cesium radionuclides were detected and measured in all the samples but other long-lived radionuclides such as Ce-144 and Ru-106 were measured in only one sample. The present data support the fact that radioactivity monitoring in mosses can be useful to determine the lasting effect of radioactive contamination

Crystal structure of 1-ferrocenyl-(3-methyl-1-phenyl-aziridin-2-yl)-methanone, (C5H5)Fe(C16H16NO)

WOS: 000234198700025C21H21FeNO, monoclinic, P12(1)/alpha 1 (no. 14), a = 7.329(7) angstrom, b = 17.343(3) angstrom, c = 13.618(5) angstrom beta = 95.02 degrees, V = 1724.3 angstrom(3), Z = 4, R-gt(F) = 0.044, wR(ref)(F-2) = 0. 111, T = 293 K

Crystal structure of 1-ferrocenyl-(3-methyl-1-phenylaziridin-2-yl)-methanone, (C5H5)Fe(C16H16NO)

C21H21FeNO, monoclinic, P121/a1 (no. 14), a = 7.329(7) Å, b = 17.343(3) Å, c = 13.618(5) Å, ? = 95.02°, V = 1724.3 Å3, Z = 4, Rgt(F) = 0.044, wRref(F2) = 0.111, T= 293 K. © 2005, Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer Str. 145, 81671 München. All rights reserved

Synthesis and Crystal Structure Determination of a Dimeric Complex of Dimethylammoniumbis(p-tert-butylcatecholato) borate

Bulut, Adnan/0000-0001-9322-0325WOS:000562043700001The structure of a dimeric complex, namely dimethylammoniumbis{(p-tert-butylcatecholato) borate}, was determined by X-ray crystallography. The compound crystallized in a triclinic system, and was characterized to be in the space group P-1, with cell parameters a = 11.929(7)angstrom, b = 16.833(6)angstrom, c = 11.259(11)angstrom, alpha = 93.75(5)degrees, beta = 91.00(7)degrees, gamma = 100.37(4)degrees, Z = 4, and V = 2218(3)angstrom(3). The crystal packing is conducted by intermolecular/intramolecular N-H-O hydrogen bonds. The B atom adopts a distorted tetrahedral geometry with four O atoms of p-tert-butylcatechol ligands.Kirikkale UniversityKirikkale UniversityThe authors very much appreciate the financial support by Kirikkale University