Journal of Applied Biology
Year:2001 | Volume:14 | Issue:2|Papers Count:7

In this Paper we are dealing with the low temperature thermoluminescence (TL) of optical fibers, previously illuminated by DV light following a X-ray irradiation. Since optical energy is insufficient to form new intrinsic defects all the signals are thought to arise from phototransfer from deep stable defect states formed during fibre production. A comparison with the TL signals of crystalline quarts shows a probable evidence of the crystalline phase generation in the fibre preform.

The present paper studies the Hopfian and Co - Hopfian objects in the category of rings and modules. Also the Hopfian and Co - Hopfian topological spaces, algebras and lattices are introduced, and the Hopfian and CO - Hopfian modules are charaterized. Furtheremore, the connection between the Hopfian and Co - Hopfian algebras and topological spaces is discussed.

Three stratigraphic sections form Cretaceous sediments in north Shiraz is studied on base of foraminifera and calcareous algae. In studied sections, Dariyan Fonilation is composed of limestone strata. Its upper contact with Kazhdumi Formation is disconformably. Through the lowermost part of Kazhdumi Formation were distinguished calcareous algae such as: Permocaculus irenae, Trinocladus tripolitanus, Dissocladella deserta and Dissocladella undulata acdmpanied to Orbitolina conica and Or. subconcave. Concerning the range zone of Or. Conica, Or. subconcave and above mentioned calcareous algae is concluded that Kazhdumi Formation belongs to Middle Albian - Lower Cenomanian stage. The presence of Knemiceras ammonite also prove the sedimentation phase earliest of Kazhdumi Formation occurs during Middle Albian. Sarvak Formation is composed of medium bedded brrecia limestone and medium - thick beded gray limestone. Sarvak Formation limestones in two stratigraphic sections contain planktonic forminifera and one of that bentonic forminifera. On bese of these microfossils, Sarvak Formation belongs to Lower - Middle Cenomanian stage.

The compounds lead oxides were prepared in this lab and its charaterization is made by X-Ray. The thermal properties is investigted by the thermogravimetry method (TGA) in the range 25-600°C. It is shown that this compounds decomposed at 600°C in lead oxides Alfa-PbO and Beta-PbO. Investigation of the morphology of this compounds, Alfa-PbO2 and Beta-PbO2, is made by electron microscopy blow up to 5000.

Since a large amounts of grape pomace is annually produced in grape juice and grape concentrate production plants, we have considered the recovery of the tartrate contents of grape pomace. In this research, extracted tartrates from pressed pomace, have converted to calcium. tartrate and then to tartaric acid. In order to extract the tartrates, "Acid Process" have been used. The most important stage of this process is the clarification of extracted tartrate solution. An innovative method has been practiced for removal of impurities and suspended particles. In this method, some chemicals such as gelatin and bentonite have been used and reasonable results have been gained. The tartrates of clarified solution have been precipitated as calcium tartrate and then reacted with sulfuric acid to form tartaric acid solution. This solution is concentrated to obtain L (+)-tartaric acid crystals. The purity of crystals are 99%.

A proton NMR method for the study of the effect hydrogen binding and determination of solvation numbers of alkaline earth cations with methanol (MeOH) in intromethane (NM) as diluent is described. The method is based on monitoring the resonance frequency of MeOH protons as a function of MeOH to metal ion mole ratio at constant metal ion concentration. The average solvation number of cation, n, at any MeOH/ metal ion: mole ratio was calculated from the NMR chemical shift-mole ratio data and was plotted against the mole ratio values. The solvation numbers of alkaline earth cations were obtained from the limiting values of the corresponding n, vs. mole ratio plots.