Publications by authors named "Ataullah Khan"

Background: Negative appendectomies result in unnecessary admissions, health care burden, and cost. This study was conducted to assess total leukocyte and neutrophil counts as preventive tools in reducing negative appendectomies.

Methods: Data of admitted patients who underwent appendectomies was analyzed.

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This study evaluates the existence of toxic compounds in thermomechanical pulp sludge (TMPS) derived biochars obtained through a slow pyrolysis process and establishes the criteria for manufacturing benign-quality biochar for safe greenhouse-based food production. Accordingly, nine TMPS biochars generated at different temperatures (450, 500, 550 °C) and residence times (30, 60, 120 min) were investigated. Depending on the production conditions, the polycyclic aromatic hydrocarbons (PAHs) sum varied from 0.

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Background: Only few reported cases of tectocerebellar dysraphia with occipital encephalocele have been reported in the literature.

Case Presentation: Three month baby boy, the first child of healthy, consanguineous parents presented with a small swelling over the occipital region since birth. The child also used to have apneic spells without cyanosis and spontaneous recovery.

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Objective: To assess the prevalence and clinical features of B12 deficiency in hypothyroid patients and to evaluate clinical response in symptoms to B12 replacement therapy.

Methods: One hundred and sixteen hypothyroid patients from our endocrine clinic were evaluated for signs and symptoms of vitamin B12 deficiency. Laboratory parameters including Haemoglobin (Hb), MCV, Vitamin B12 levels and presence of anti thyroid antibodies were analyzed.

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Ce(x)Zr(1)(-)(x)O(2) solid solutions deposited over silica surface were investigated by X-ray diffraction (XRD), Raman spectroscopy (RS), and high-resolution transmission electron microscopy (HREM) techniques in order to understand the role of silica support and the temperature stability of these composite oxides. For the purpose of comparison, an unsupported Ce(x)Zr(1)(-)(x)O(2) was also synthesized and subjected to characterization by various techniques. The Ce(x)Zr(1)(-)(x)O(2)/SiO(2) (CZ/S) (1:1:2 mole ratio based on oxides) was synthesized by depositing Ce(x)Zr(1)(-)(x)O(2) solid solution over a colloidal SiO(2) support by a deposition precipitation method and unsupported Ce(x)Zr(1)(-)(x)O(2) (CZ) (1:1 mole ratio based on oxides) was prepared by a coprecipitation procedure, and the obtained catalysts were subjected to thermal treatments from 773 to 1073 K.

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Structural characteristics of nanosized ceria-silica, ceria-titania, and ceria-zirconia mixed oxide catalysts have been investigated using X-ray diffraction (XRD), Raman spectroscopy, BET surface area, thermogravimetry, and high-resolution transmission electron microscopy (HREM). The effect of support oxides on the crystal modification of ceria cubic lattice was mainly focused. The investigated oxides were obtained by soft chemical routes with ultrahighly dilute solutions and were subjected to thermal treatments from 773 to 1073 K.

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Structural characteristics of CeO(2)-ZrO(2)/TiO(2) (CZ/T) and V(2)O(5)/CeO(2)-ZrO(2)/TiO(2) (V/CZ/T) mixed oxide catalysts have been investigated using X-ray diffraction (XRD), BET surface area, Raman spectroscopy (RS), and high-resolution transmission electron microscopy (HREM) techniques. The CeO(2)-ZrO(2) (1:1 mole ratio) solid solution was deposited over a finely powdered TiO(2) support by a deposition precipitation method. A nominal 5 wt % V(2)O(5) was impregnated over the calcined (773 K) CZ/T mixed oxide carrier by a wet impregnation technique.

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The oxidation products of three Rauwolfia alkaloids having yohimbane skeleton, namely, reserpine, rescinnamine and ajmalicine have been characterised by chromatographic and spectroscopic techniques. The Rf values of the oxidation products (3, 4-dehydro derivatives) in several solvent systems and the spectral data on UV, IR, NMR and fluorescence characteristics have been determined to confirm the structure of these compounds.

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Copper(I) complexes of the type [CuX(PPh3)n(L)n]n {where X = Cl-, Br- I-, NO3, SCN-; PPh3 = triphenylphosphine and L = 4-ethylpyridine} have been prepared and characterized on the basis of their molecular weight, magnetic susceptibility, conductance, infrared studies and elemental analysis. Ethylpyridine behaved as monodentate ligand. The variation in stoichiometry and the probable structures of these complexes have been discussed.

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The UV irradiated aqueous solutions of folic acid at pH 2-10 degrade to give pterin-6-carboxylic acid and p-aminobenzoyl-L-glutamic acid under aerobic conditions. These photoproducts have been identified by TLC, HPLC and Spectrophotometric techniques. A reaction scheme for the photodegradation pathways of folic acid leading to the formation of the photoproducts in acid and alkaline media has been proposed which involves the participation of an enamine intermediate.

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