Government College

About: Government College is a based out in . It is known for research contribution in the topics: Population & Ring (chemistry). The organization has 4481 authors who have published 5986 publications receiving 57398 citations.

Luminescence and EPR Studies of Gd3+-Activated Strong UV-Emitting CaZrO3 Phosphors Prepared via Solution Combustion Method

Abstract: The CaZrO3:Gd3+ phosphor has been prepared by the solution combustion process. The phosphor was well characterized using x-ray diffraction, scanning electron microscopy, diffuse reflectance, electron paramagnetic resonance (EPR), and photoluminescence techniques. Upon UV light excitation (273 nm), the phosphor exhibits an ultraviolet B emission at 312 nm, which is ascribed to 6P7/2 → 8S7/2 transition of Gd3+ ions. EPR analysis of the sample confirms the presence of Gd3+ in the CaZrO3 matrix.

A novel type of autosomal recessive syndactyly: Clinical and molecular studies in a family of Pakistani origin

Abstract: Non-syndromic syndactylies have been classified into five major types (I-V), all showing autosomal dominant mode of inheritance. Later, the classification was extended and three additional variants (VI-VIII) were defined. Type VII, the Cenani-Lenz syndactyly, is the only non-syndromic, autosomal recessive type. It is characterized by fusion of all phalanges with metacarpal synostosis, dislocated and dysplastic carpals and infrequently, radio-ulnar fusion. Here, we present a Pakistani family with a novel non-syndromic autosomal recessive syndactyly manifesting a unique combination of clinical features. In both hands, reduction of certain phalanges is evident. Radiological examination shows synostosis of third and fourth metacarpals bearing single phalanges. The first three toes are webbed, with hypoplastic terminal phalanx in all the toes. Besides Cenani-Lenz syndactyly, the phenotype segregating in our family is the second well-documented autosomal recessive, non-syndromic syndactyly. A phenotype similar to our family was described in a Turkish kindred but was considered to be a homozygous expression of type I syndactyly. Since the clinical features in our family had minimal overlap with syndactyly types I, II, and III, we have performed microsatellite marker screening to look for the cosegregation of this phenotype with any of the known loci for these respective types. We show that the phenotype in our family is not linked to chromosomal regions 2q34-q36, 2q31, and 6q22-q23 encompassing loci for syndactyly types I, II, and III.

Dielectric relaxation in slightly hydrated bovine tendon collagen

Abstract: With an aim to reveal the mechanism of water?protein interaction from the dielectric response of a model fibrous protein, the dielectric constant ?' and loss factor ?'' have been measured in air dried and vacuum dried samples of bovine tendon collagen in the frequency range 30?Hz?3?MHz and temperature range 30?200??C. An anomalous low frequency dispersion (LFD) and an intermediate frequency strong ?-dispersion peak were the two main dielectric responses observed in the air dried sample. The LFD followed the fractional power law of frequency while the ?-dispersion conformed to the Cole?Cole modified Debye equation. These dispersions, respectively, have been attributed to percolation of protons between and within the clusters of hydrogen bonded water molecules bound to polar or ionizable protein components. In the vacuum dried sample, however, a very weak high frequency ?2-dispersion peak was observed, which was hidden below the strong ?-dispersion in the air dried sample. This peak may be attributed to reorientation of polar components of the collagen molecule.Temperature dependence of the dielectric data shows release of bound water as a four-step process with discrete peaks at 50, 90, 125 and 160??C. These peaks have been attributed to the onset of the release of adsorbed surface water, water bound to exposed polar sites, water bound to internal polar sites and very strongly bound structural water, respectively.