Showing papers by "Minia University published in 1998"
TL;DR: In this paper, unsaponifiable matter from unroasted (USM) and roasted white sesame seeds (RSM) was added individually to sunflower oil at levels of 0.02, 0.05 and 0.1% and their effectiveness was compared with a control (no additives) at 63 °C.
157 citations
TL;DR: RA patients have significantly more depressive symptoms and tend to be more clinically depressed than OA patients, and the contribution of some sociodemographic and clinical variables to depression in RA patients was modest, albeit significant.
Abstract: The objectives were to determine the differences in depressive symptoms and depression between rheumatoid arthritis (RA) and osteoarthritis (OA) patients, and to analyse the contribution of sociodemographic and clinical variables to depression in RA patients. The responses of 60 Egyptian RA patients and 40 patients with OA of the knees to the Symptom Checklist-90-R Depression subscale were compared. The proportions of patients from both groups confirmed by a psychiatric interview to be clinically depressed according to the DSM-III-R criteria were also compared. The contributions of sociodemographic and disease variables to depressive symptoms and clinical depression in RA patients were explored by multiple linear and logistic regression, respectively. RA patients showed significantly higher depression scores than OA patients (P = 0.001). The difference was unaffected by controlling for the effects of age, sex, disease duration and the sociodemographic covariates. A depressive disorder was clinically confirmed in 23% of RA patients and 10% of OA patients. The erythrocyte sedimentation rate (ESR), being unmarried and an urban residence were significant predictors of depressive symptoms (P < 0.05), while being unmarried (P < 0.05, OR = 2.1) and HAQ disability (P < 0.01, OR = 3.8) were significant predictors of clinical depression in RA patients. RA patients have significantly more depressive symptoms and tend to be more clinically depressed than OA patients. The contribution of some.
151 citations
TL;DR: In this paper, the ability of sugar industry mud to adsorb Basic Red-22 dye has been studied in two modes of operation: batch and continuous flow systems, and the influence of varying parameters such as bed depth and solution flowrate has been investigated.
97 citations
TL;DR: In this article, high-grade metapelitic paragneisses from the southern Eastern Desert of Egypt (Abu Swayel area) were analysed with the electron microprobe mainly in an attempt to broadly constrain the metamorphic ages of the rocks by means of chemical Th(U)-Pb dating.
Abstract: Monazites from high-grade metapelitic paragneisses from the southern Eastern Desert of Egypt (Abu Swayel area) were analysed with the electron microprobe mainly in an attempt to broadly constrain the metamorphic ages of the rocks by means of chemical Th(U)-Pb dating. Two samples were investigated, one showed weak signs of a greenschist facies overprint, the other one did not. For each sample, weighted average ages were calculated from long-time analyses of 18 (16) individual grains with a 5 μm beam placed in the grain centres. The average ages were almost the same (636± 10 Ma, 633±10 Ma). The monazites appeared chemically fairly uniform and homogeneous in both samples with ThO2 contents of ca. 3.3-4.5 wt.%, UO2 0.4-1.2 wt.%, La2O3 12–13 wt.%, Nd2O3 11-13 wt.%, Y2O3 1.8-2.6 wt.%. Some larger grains displayed a weak concentric zoning in the BSE image with increasing brightness near the rims. A microprobe traverse was laid across a zoned monazite from the slightly retrogressed sample. It was found that the U and Y contents were somewhat higher in the outer growth shell. The high Y contents at the rims argue for crystal growth under prograde temperature conditions and against a retrograde overgrowth. There appeared to be a tendency that the model ages become slightly younger towards the crystals rim (645±15 Ma in the core section versus 633±16 Ma in the rim section of the profile). However, the observed differences are interpreted as equivocal due to the limited resolution of EMP monazite dating. Clearly, the results do not support previous hypotheses, according to which Abu Swayel gneisses should belong to pre-Panafrican, mid-Proterozoic metamorphic sequences. Instead, the data accord with other 600-650 Ma metamorphic ages recently recognized near the contact of the East Sahara Craton and the Arabian Nubian Shield. The best interpretation is that high-grade metamorphism at that time occurred in connection with collisional crustal thickening, when a Panafrican terrane assembly was attached to the east Sahara Craton from the (present day) east. This event appears to be distinct from an earlier phase of high-grade regional metamorphism between ca. 700 and 750 Ma, which has been documented in other parts of the Arabian Nubian Shield.
86 citations
TL;DR: In this paper, the presence of phosphate ions causes the tetragonal ZrO2 phase to form at low temperature (≤970 K) and the surface area to stabilize, when Zr(OH)4 was the precursor used.
72 citations
TL;DR: Two multidimensional health status instruments of rheumatic diseases, the Dutch-AIMS2 and the IRGL, were compared in a sample of 284 rheumatoid arthritis patients with regard to their measurement properties and usefulness for research purposes.
Abstract: Two multidimensional health status instruments of rheumatic diseases, the Dutch-AIMS2 and the IRGL (Impact of Rheumatic diseases on General health and Lifestyle), were compared in a sample of 284 rheumatoid arthritis patients with regard to their measurement properties and usefulness for research purposes. Both questionnaires showed an excellent reliability (Cronbach's alpha), and were highly comparable with regard to their construct and convergent validity. Second-order factor analysis confirmed the physical, psychological and social health dimensions for both questionnaires. The comparability between the instruments was established by high intercorrelations between the physical and psychological health dimensions. Sufficient convergent validity was indicated by the strong correlations between the physical functioning scales and clinical and laboratory measures. The main differences between both questionnaires relate to their length and emphasis on health aspects. The Dutch-AIMS2 is characterized by a more extensive assessment of the physical dimension and the additional measurement of general health aspects. The shorter IRGL exclusively assesses the main health dimensions with a more comprehensive measurement of the psychological and social dimensions. The instrument that reflects the subject in question most adequately should be chosen.
67 citations
TL;DR: Chrysosporium georgiae was the most superior for keratinase production among the ChrysOSporium species tested in the presence or absence of glucose, indicating its inducible nature.
Abstract: Using a baiting technique, Chrysosporium georgiae was isolated from chicken feathers Twenty-eight different fungal isolates were evaluated for their ability to produce keratinase enzymes using a keratin–salt agar medium containing either white chicken feathers or a prepared feather keratin suspension (KS) The Chrysosporium species were able to use keratin and grow at different rates Chrysosporium georgiae completely degraded the added keratin after 9 days of incubation Degradation of feathers by C georgiae was affected by several cultural factors Highest keratinolytic activity occurred after 3 weeks of incubation at 6 and 8~pH at 30 °C Chrysosporium georgiae was able to degrade white chicken feathers, whereas bovine and human hair and sheep wool were not degraded and did not support fungal growth Addition of 1% glucose to the medium containing keratin improved fungal growth and increased enzyme production Higher keratin degradation resulted in high SH accumulation and the utilization of the carbohydrate carbon in the medium resulted in high keto-acid accumulation but decreased ammonia accumulation Supplementation of the keratin–salt medium with minerals such as NH4Cl and MgSO4 slightly increased mycelial growth, but decreased production of extracelluar keratinase Keratinase enzymes were very poorly produced in the absence of keratin, indicating its inducible nature Analysis of endocellular keratinases in the mycelial homogenate indicated higher activity of intracellular keratinase as compared to the extracellular enzyme in culture filtrates Chrysosporium georgiae was the most superior for keratinase production among the Chrysosporium species tested in the presence or absence of glucose It produced more of the intracellular enzymes than the exocellular ones
58 citations
TL;DR: In this paper, the role of added inorganic salt on the thermal degradation of lignin was studied and compared with two types of agricultural residues: rice straw and bagasse.
Abstract: The role of added inorganic salt on the thermal degradation of lignin was studied. The result was compared with the thermal analysis of two types of agricultural residues: rice straw with high silica content and bagasse with low silica. Thermal decomposition of such materials is faster than that of wood with a dual mechanism concept similar to wood. In general, the activation energy for rice straw is low, about 19.3 Kcal/mole, while that of bagasse is 33.4 Kcal/mole. This proves that the inorganic material, either inherited or added, changed the thermal activities of the lignocellulosic materials.
39 citations
TL;DR: The efficiency of free and alginate‐encapsulated Azotobacter chroococcum in fixing nitrogen and their susceptibility to bacteriophages were studied in pure liquid cultures (in vitro) and under cultivated soil conditions (in vivo).
Abstract: The efficiency of free and alginate-encapsulated Azotobacter chroococcum in fixing nitrogen and their susceptibility to bacteriophages were studied in pure liquid cultures (in vitro) and under cultivated soil conditions (in vivo). Bacteriophages of A. chroococcum were isolated and were found to be common in soil of the Experimental Farm of Fac. Agric., Minia Univ., Egypt.
In pure liquid cultures, the immobilized cells exhibited much higher nitrogenase activity (about 57 fold) than the free ones. The encapsulation system offered high protection to A. chroococcum against their phages. No nitrogenase activity was detected for the free cells in presence of phages.
Uner cultivated soil conditions, inoculation of maize plants (Zea mays, cv. GIZA 2) with immobilized A. chroococcum, markedly increased rhizosphere and rhizoplane Azotobacter population, significantly increased plant N% as well as dry weight/plant, compared to those inoculated with free cells. In free cells inoculated-plants, bacteriophages had a marked depressive effect on rhizosphere and rhizoplane Azotobacter population, significantly reduced plant N% and dry weight/plant, as compared to plants inoculated with free cells in absence of phages. In plants inoculated with immobilized cells, no significant effect for presence of phages was detected in plant N% and dry weight/plant, whereas, a slight reduction in rhizosphere and rhizoplane Azotobacter population was observed.
34 citations
TL;DR: In this paper, phase properties of the field interacting with a two-level atom in a lossless cavity Jaynes-Cummings model, taking into account the level shifts produced by Stark effect with an additional Kerr medium for one-mode are studied using the phase formalism of Pegg and Barnett.
Abstract: Phase properties of the field interacting with a two-level atom in a lossless cavity Jaynes-Cummings model, taking into account the level shifts produced by Stark effect with an additional Kerr medium for one-mode are studied using the phase formalism of Pegg and Barnett. It is shown in particular that phase properties of the field reflect the collapse and revival phenomena. The results for the time evolution of the phase probability distribution and the phase fluctuations are obtained. The effect of Stark shift on the phase properties in both the absence and presence of a Kerr medium is analyzed. Phase localization is found for certain choice of the parameters.
33 citations
TL;DR: In this article, the aerial parts of Laggera crispata and Pluchea carolonesis were investigated and three new eudesmane derivatives, 3β,4α-dihydroxy-7-epi-eudesm-11(13)-ene, 3α-(2′,3′-dhydrox-2′-methylbutanoyl)-4,11-doglobalamide-6,7-dehydroeudesman-8-one and 3α-chloro-2-hydroxy-2
TL;DR: In this article, the surface and catalytic properties of Y 2 O 3 catalysts generated from different inorganic precursors were investigated by the reactions of pyridine and 2-propanol using IR-spectroscopy.
TL;DR: Collectively, these desert rodent species were responsive to day length changes, but these changes alone did not induce robust alterations in reproductive status and body and lipid masses.
Abstract: The purpose of this study was to examine the effect of the photoperiod on reproductive status and body and lipid masses in four Egyptian desert rodent species (Dipodillus dasyurus,Acomys cahirinus,...
TL;DR: In this paper, the performance of calcined, supported and unsupported chromias obtained via various precursor compounds has been investigated in terms of thermal decomposition, hydrolysis and reduction.
Abstract: The present investigation presents and correlates observed and reported characterization results of calcined, supported and unsupported chromias obtained via various precursor compounds. Studies performed employed a range of surface and bulk analytical techniques, in hopes of a proper assessment of the stability of surface chromate (Cr(VI)–O) species thus generated to thermal decomposition, hydrolysis and reduction. Impacts on the redox catalytic activity were probed towards the decomposition of H 2 O 2 solutions and the CO oxidation in the gas phase. The results have revealed that chromate species established on bulk and dispersed α-Cr 2 O 3 particles enjoy high stability against thermal and chemical treatments, and yet contribute to the formation of surface sites that are catalytically active in redox reactions. This should help lessening environmental reservations about the industrial application of calcined chromia catalysts.
TL;DR: From the aerial parts of Xanthium strumarium, three new xanthanolide and xanthane-type sesquiterpenoids, 11alpha,13-dihydroxanthatin-1alpha,4alpha-endoperoxide, and 1beta,4beta, 4alpha,5alpha-diepoxyxanth-11(13)-en-12-oic acid have been isolated, together with seven known compounds.
Abstract: From the aerial parts of Xanthium strumarium, three new xanthanolide and xanthane-type sesquiterpenoids, 11alpha,13-dihydroxanthatin, 4beta,5beta-epoxyxanthatin-1alpha,4alpha-endoperoxide, and 1beta,4beta,4alpha,5alpha-diepoxyxanth-11(13)-en-12-oic acid have been isolated, together with seven known compounds. The structures were determined by spectroscopic methods, particularly high resolution 1D, 2D NMR spectroscopy and NOE experiments.
TL;DR: The extract of the leaves of Jasonia candicans yielded, seven new sesquiterpenes and sesiquiterpene lactones including a eudesmane containing a rare type of 6/6/4 membered ring system, two 7-epi-eudesmanes (12-hydroxyisointermedeol and 7-EPI-ilicic acid), two guaianolides (inuviscolide and its 8-epI- derivative), iphionane and cadinane-triol derivatives as discussed by the authors
TL;DR: In this paper, mixed-ligand complexes of CoII, NiII, and CuII with dicarboxylic amino acids (aspartic and glutamic or H2ADA) as primary ligands and 8-hydroxyquinoline as a secondary ligand were prepared and characterized.
Abstract: Mixed-ligand complexes of CoII, NiII, and CuII with dicarboxylic amino acids (aspartic and glutamic or H2ADA) as primary ligands and 8-hydroxyquinoline as a secondary ligand were prepared and characterized. Formation constants of the different complexes were determined acidimetrically at 25 °C and at ionic strength I = 0.1 mol dm-3 (KNO3) and were discussed in terms of the nature of both the metal ion and the ligand used. The thermodynamic functions (ΔH, ΔG°, and ΔS°) associated with the formation of [MII + (HADA)1- + 8-hydroxyquinoline] complexes were also calculated and discussed.
TL;DR: It was found that the electrode exhibited good selectivity for cesium over alkali, alkaline earth and some transition metal ions, and the electrode response was stable over a wide pH range.
TL;DR: In this article, the salinity of the collected water samples is governed by the rock type, air-borne dust and marine aerosols, and the water was found to be suitable for drinking and agricultural purposes.
TL;DR: In this article, the non-degenerate bimodal multiquanta Jaynes-Cummings model governed by the Milburn equation is studied and an exact solution of this equation is obtained and applied to investigate the influence of the intrinsic decoherence on nonclassical effects (population inversion, oscillations of the number distribution, squeezing of the field modes), for the resonant and the off-resonant cases.
Abstract: The nondegenerate bimodal multiquanta Jaynes-Cummings model (JCM) governed by the Milburn equation is studied. An exact solution of this equation is obtained and applied to investigate the influence of the intrinsic decoherence on nonclassical effects (population inversion, oscillations of the number distribution, squeezing of the field modes), for the resonant and the off-resonant cases.
TL;DR: In this paper, the dissolution, passivation and pitting corrosion of tin in aqueous solution of Na 2 CO 3 in absence and presence of Cl − and I − ions were investigated.
TL;DR: In this paper, a re-investigation of the aerial parts of Ethulia conyzoides from Egypt afforded two new monoterpene 5-methylcoumarins.
TL;DR: In this article, the currentvoltage characteristics of the Au-V 2 O 5 -Au thin film sandwich system at different temperatures were studied using Jonscher-Ansari modified Poole-Frenkel type.
Abstract: The current–voltage characteristics of the Au–V 2 O 5 –Au thin film sandwich system at different temperatures were studied. The DC conduction mechanism was explained using Jonscher–Ansari modified Poole–Frenkel type. Both freshly evaporated and annealed vanadium pentoxide films are amorphous.
TL;DR: The inverse relationship between the unattached fraction of potential alpha-particle energy in room air and the radioactive equilibrium between Radon gas and its progeny indicates that dose equivalent is closely related to the concentration of radon gas averaged over a period of exposure.
TL;DR: In this article, the optimum thallium(I) ion-selective electrode is made from 2-cyclohexylthio-4-oxo-1(4H)quinoline-3-carbonitrile as the electroactive material.
TL;DR: In this article, the electrochromic properties of reactive rf reactively sputtered tungsten oxide films have been investigated in relation to the oxygen concentration in the sputtering atmosphere.
TL;DR: A new technique of shoulder fusion is presented using a posterior approach that provides high shear resistance and low axial stiffness without deforming plastically, and is effective in patients with osteoporosis, and gives a high rate of union.
Abstract: A new technique of shoulder fusion is presented using a posterior approach. After removal of the articular cartilage, a Rush pin is introduced from the spine of the scapula, through the glenoid into the medullary canal of the humerus. This is supplemented by tension-band wiring from the acromion to the neck of the humerus and a muscle pedicle graft attached to the acromion. A shoulder spica is applied for four to six weeks. Four patients with injuries to the upper brachial plexus and 14 with paralysis of the upper arm due to anterior poliomyelitis have been followed for three years. One of the 18 patients developed nonunion; she had removed her own cast prematurely. This method of fixation provides high shear resistance and low axial stiffness without deforming plastically. It does not affect bone growth in young patients, is effective in patients with osteoporosis, and gives a high rate of union.
TL;DR: In this article, the capability of these sorbents (V-XII) for the extraction of Fe(III) and the divalent metal ions Co(II), Ni, Ni, Cu, Zn, Cd, Pb, and Pb(III), along with their extraction by the parent sorbent (I-IV), from aqueous solutions, are determined in various buffer solutions by using the batch equilibrium method.
Abstract: Silica gel immobilized aliphatic mono and polyamine sorbents (I–IV) were further modified by Schiffs base reaction with the carbonyl-containing compounds isatin and ninhydrin to produce the corresponding eight newly synthesized sorbents (V–XII). The capability of these sorbents (V–XII) for the extraction of Fe(III) and the divalent metal ions Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Pb(III), along with Fe(III) extraction by the parent sorbents (I–IV), from aqueous solutions, are determined in various buffer solutions by using the batch equilibrium method. The results obtained are discussed in terms of molecular structure of the immobilized chelates and indicated that the incorporated hard oxygen donor ligands significantly improve the uptake of Fe(III), known to act as a hard acid. Moreover, TGA revealed that there is an appreciable increase in thermal stability of two representative new sorbents, isatin (VI) and ninhydrin (X) as compared to their parent ethylenediamine silica gel sorbent (II).
TL;DR: Energy consumption for adsorption of basic dyes on clay was carried out on laboratory scale using gas and mechanical stirring as mentioned in this paper, and the results showed that the energy consumption was substantially lower for air stirring, approximately 60 times lower, than for mechanical stirring under identical conditions of adaption.