Showing papers by "Cairo University published in 1974"
TL;DR: Various subspecies, botanical varieties and cultivars of peanuts from widely separated areas of South America and Africa were evaluated for resistance to C. personatum and C. arachidicola, finding several immune and many highly resistant collections of Arachis.
Abstract: Various subspecies, botanical varieties and cultivars of peanuts (Arachis hypogaea L.) from widely separated areas of South America and Africa were evaluated for resistance to C. personatum and C. arachidicola. All cultivated peanuts tested were highly susceptible to both fungi except one collection from Peru, which showed a high degree of tolerance to defoliation. Sources of resistance were found in the wild Arachis species. Several immune and many highly resistant collections of Arachis were found in the sections Erectoides, Rhizomatosae, and Extranervosae. In section Axonomorphae, A. chacoense (10602 GKP) was highly resistant to C. arachidicola but susceptible to C. personatum, and C. cardenasii (10017 GKP) was susceptible to C. arachidicola but immune to C. personatum. Both Arachis species are cross-compatible with A. hypogaea. Host response in terms of pathogen penetration was classified into: immune, moderately and highly susceptible; and the reactions after penetration were: highly resista...
79 citations
65 citations
TL;DR: In this paper, Malonitrile reacts with β-cyanoethylhydrazine (2) to yield 5-amino-4-cyanomethyl-4,5,6,7-tetrahydropyrazolo[1.5-a] pyrimine.
55 citations
52 citations
TL;DR: The acid-extractable, water-soluble, polysaccharide material of the brown alga Sargassum linifolium has been fractionated by using lead acetate and barium hydroxide, cetylpyridinium chloride, and copper acetate, and by chromatography on DEAE-cellulose andDEAE-Sephadex.
50 citations
TL;DR: In this article, a full electromagnetic treatment was employed to evaluate the effect of finite s corrections on the stability of a plasma immersed in a sheared magnetic field of shear length Ls and having a density gradient of scale length Ln, where ai is the ion gyration radius and k is the wave vector perpendicular to both the direction of the density gradient.
Abstract: In a plasma immersed in a sheared magnetic field of shear length Ls and having a density gradient of scale length Ln, finite s (plasma pressure/magnetic pressure) results in an additional stabilizing influence over and above that due to magnetic shear. Employing a full electromagnetic treatment, these finite-s corrections are evaluated for , where ai is the ion gyration radius and k is the wave vector perpendicular to both the direction of the density gradient and the unsheared component of the magnetic field. For the parameter ranges least stabilized by shear, the dominant finite-s- stabilization effect occurs within the region about the rational surface where the phase velocity is larger than the Alfven speed. As s increases toward or (kaim/M)2/3 [In (MLn/m|Ls|)]4/3 this finite-s correction must be retained, where m/M = electron mass/ion mass.
38 citations
TL;DR: In this paper, the antimicrobial activity of the volatile oil of Nigella sativa Linneaus seeds was studied, which was identified as thymohydroquinone and found to be active against gram-positive bacteria and yeasts.
Abstract: The antimicrobial activity of the volatile oil of Nigella sativa Linneaus seeds was studied. The antimicrobial principle has been isolated, identified as thymohydroquinone, and found to be active against gram-positive bacteria and yeasts.
33 citations
TL;DR: A full bloodmeal and mating were critical factors controlling oviposition in nondiapausing females, and may enhance juvenile hormone activity, and suggest that tick bodies possess sites of hormonal activities similar to those in other arthropods.
32 citations
TL;DR: In this paper, it was shown that SBR with 50 phr of HAF carbon black has a positive temperature coefficient of resistivity close to 0.07/°C at 27°C and an activation energy of 0.56 eV at 75°C.
Abstract: Styrene–butadiene rubber (SBR) charged with 50 phr of HAF carbon black has been found to show a positive temperature coefficient of resistivity close to 0.07/°C at 27°C. Beyond a point (75°C) of minimum conductivity, however, it behaves as a normal noncrystalline semiconductor with a resistivity which decreases with rise of temperature with an activation energy of 0.56 eV. Blending the composition with poly(vinyl chloride) (PVC) shifts the minimum towards lower temperatures. The descending branch of the conductivity versus reciprocal absolute temperature characteristic is probably associated with thermal expansion of tunnelling paths separating the conducting carbon particles.
28 citations
01 Oct 1974
TL;DR: In this paper, the authors present a new approach which uses Helmholtz single-and double-layer potentials to derive integral equations which relate the values of the axial current density and the tangential magnetic field at the surface of the conductor.
Abstract: The problem considered is that of evaluating the induced fields and the power loss in a long conductor with arbitrary cross-section placed in a time-harmonic transverse magnetic (TM) field. Hitherto, the problem has been analysed by numerically solving the governing differential equations or a volume-type integral equation. The paper presents a new approach which uses Helmholtz single-and double-layer potentials to derive integral equations which relate the values of the axial current density and the tangential magnetic field at the surface of the conductor. These are two coupled Fredholm integral equations with weakly singular kernels. As an example, the eddy-current losses in a rectangular conductor placed in a uniform magnetic field are computed, and the results arecompared with previous ones. The proposed approach has two salient advantages. First, by reducing the dimensions of the problem by one, the computation time is considerably reduced. Consequently, many problems that are beyond the practical limit of previous approaches can be easily handled. Secondly, both magnetic and nonmagnetic conductors can be handled.
23 citations
TL;DR: In this paper, the authors used the corona space charge density to calculate corona losses on monopolar and bipolar dc transmission lines, in which the space charge of corona does not affect the direction of the electrostatic field.
Abstract: Existing methods for calculating corona losses on monopolar and bipolar dc transmission lines have resorted to the assumption that the space charge of corona does not affect the direction of the electrostatic field. This assumption was aimed at making the calculations possible. In this report corena loss calculations are made in which this assumption and others are replaced by correlating tlie corona space charge density to the avalanche growth inside the ionization zone at the high voltage conductor. This approach seems to be more realistic, gives better agreement with experiment and needs much less computer time.
TL;DR: In this paper, an improved method for calculating positive and negative corona pulses is presented, where the calculated pulse shapes fit those observed, and the measured pulse amplitudes and repetition rates are much closer to the measurements than those calculated previously.
Abstract: An improved method for calculating positive and negative corona pulses is presented. Not only do the calculated pulse shapes fit those observed, but also the calculated pulse amplitudes and repetition rates are much closer to the measurements than those calculated previously.
TL;DR: Intravenous administration of 2 mg propranolol HCl and oxprenolol produced a significant reduction in the intraocular pressure in normal human subjects, and there were no corresponding changes in arterial blood pressure.
TL;DR: In this article, a systematic study has been carried out on the extraction of Sb(III and SbV) with aromatic hydrocarbons and some other solvents.
TL;DR: In this paper, a kinetic study of the diazo coupling reaction of p-nitrobenzenediazo phenyl sulfide with β-naphthol under various conditions revealed that the reaction is of first order kinetics with respect to the diazotised arylamines and thiophenol, and that the rate of coupling measured colorimetrically is influenced by the hydrogen ion concentration and by the ionising power of the medium.
Abstract: Aryldiazophenyl sulfides prepared from diazotised arylamines and thiophenol at controlled pH, are coupled with β-naphthol yielding the corresponding azo dye.
A kinetic study of the diazo coupling reaction of p-nitrobenzenediazo phenyl sulfide with β-naphthol under various conditions revealed that the reaction is of first order kinetics with respect to the diazo phenyl sulfide, and that the rate of coupling measured colorimetrically is influenced by the hydrogen ion concentration and by the ionising power of the medium.
01 Jan 1974-Zentralblatt für Bakteriologie, Parasitenkunde, Infektionskrankheiten und Hygiene. Zweite Naturwissenschaftliche Abteilung: Allgemeine, Landwirtschaftliche und Technische Mikrobiologie
TL;DR: Synthesis media in common use persistently yielded low MPN counts, and failed to support the aerobic spore-forming and some of the Gram-negative denitrifying bacilli, while complex media containing peptone and yeast extract tended to give highest counts.
TL;DR: In most cases the females contained less antidiuretic hormone than the males, and Jaculus, a pure desert animal, showed higher values than Gerbillus, a semidesert animal.
TL;DR: In this article, the IR and UV spectra of these compounds indicated that they exist mainly as the corresponding arylhydrazones, and they were obtained by the interaction of 1 a−g with hydrazine hydrate and with phenylhydrazine, respectively.
Abstract: ω-Cyanoacetophenone was coupled with a variety of aromatic diazonium chlorides to give the corresponding arylazo derivatives 1 a–g. Analysis of the IR and UV spectra of these compounds indicated that they exist mainly as the corresponding arylhydrazones. Compounds 1 a–d, f, g reacted with diazomethane to yield the N-methyl-arylhydrazones 2 a–f. 3-Amino-4-arylazo-5-phenylpyrazoles 5 a–g and 4-arylazo-5-imino-1,3-diphenyl-2-pyrazolines 6 a–g were obtained by the interaction of 1 a–g with hydrazine hydrate and with phenylhydrazine, respectively.
TL;DR: The diagnostic accuracy of cytologic study of urine was evaluated by cytohistopathologic correlation and the predominance of squamous carcinoma which is easy to recognize cytologically was found.
TL;DR: The fecundity—weight formula gave the best description of egg production and showed increased fecundities with increased length, weight and age of fish.
TL;DR: It is concluded that the carbohydrate moiety of sargassan involves a backbone chain of D -glucuronic acid and D -mannose residues, and side chains involving residues of D-galactose, D -xylose, and L -fucose with sulphate attached to some galactose and fucose residues.
TL;DR: In this article, the lateral double bond of 5-Arylidene-3-phenyl-2-thiazolidinone-4-thiones has been used to yield aldehyde phenylhydrazones.
Abstract: 5-Arylidene-2-thiazolidinone-4-thiones 1 undergo Michael type reactions with Ω-nitrostyrene, α,β-unsaturated ketones and N-arylmaleimides to give the corresponding 7-aryl-tetrahydro-7H-thiopyrano[2,3-d]thiazole-2-one derivatives 3 and 4. Arylmagnesium bromides add to the lateral double bond of 5-arylidene-3-phenyl-2-thiazolidinone-4-thiones 5 to yield products 6. With phenyl-hydrazine at room temperature, 1 or 5 yield the corresponding aldehyde phenylhydrazones and 4-phenyl-hydrazono-2-thiazolidinone or its 3-phenyl derivative. The thione group in 5-diaryl-methyl-2-thiazolidinone-4-thiones condenses with phenylhydrazine to yield 5-diarylmethyl-4-phenyl-hydrazono-2-thiazolidinones 9.
TL;DR: In this article, the effect of five different types of catalyst and the concentration both of glucose and catalyst on the rate of the catalytic hydrogenation of glucose has been investigated, and the results showed that the concentration of both glucose and catalysts had a significant impact on the performance of the process.
Abstract: The effect of five different types of catalyst and the concentration both of glucose and catalyst on the rate of the catalytic hydrogenation of glucose has been investigated.
TL;DR: In this article, the theory of thermoluminescence and thermally stimulated currents is extended to the case of traps with distributed binding energies, and the detailed shape of glow curves depends on the actual trap distribution.
TL;DR: The existence of the 1:1 complex species permits the use of the procedure for the microdetermination of tetracycline using UO2+2ion or vice versa.
TL;DR: In this article, a modification was proposed to take distortion into account in calculating monopolar dc corona loss on practical transmission lines, and the results calculated were found to be in agreement with the experimental data as compared with the previous calculations.
Abstract: In the case of monopolar dc corona discharge on practical transmission lines owing to the uneven distribution of electric charges around the conductor in corona, which leads to an intense distortion of the electric field, theDeutsch assumption cannot be taken into consideration, as it demonstrates that the electric field pattern does not change after the appearance of the discharge. This assumption has been applied by different investigators in calculating the monopolar dc corona loss. This paper suggests a modification: to take distortion into account in calculating monopolar dc corona loss on practical lines. The results calculated were found to be in agreement with the experimental data as compared with the previous calculations.
TL;DR: An increase in the plasma 17-hydroxycorticosteroids is necessary for maintaining the elevated body temperature during the dry summer season instead of it being dissipated by evaporation and loss of water.
01 Oct 1974
TL;DR: The purpose of this paper is to review and present collectively the different factors envolved in the mechanism of the thermoregulatory function of the testicle.
Abstract: During the mammalian evolution, it has been found that the testicles cannot perform their function when exposed to the normal body temperature. The testicles, therefore, have gradually recessed to the caudal region of the body. They first lie against the anterior abdominal wall in a cooler and primitive scrotal-like area. With further evolution, a scrotal cavity continuous with that of the abdomen is possessed, so that the testicles can migrate from the abdominal cavity to the scrotal sac and viceversa. (SISSON & GROSSMAN, 1968). In higher mammals, a closed scrotal sac is formed, and this provide within its interior a temperature lower than in the abdominal cavity. DAVIDSON (1954) and HANLEY (1956) found that unless the testicles are maintained at a temperature approximately 2.5"C lower than rectal temperature, normal spermatogenesis will not occur. However, the testicular temperature is liable to variations due to changes in environmental temperature. For spermatogenesis to occur, scrotal-rectal temperature-difference should be preserved, and this could be adjusted by a thermoregulatory mechanism. MOORE and QUICK (1924) studied the thermoregulatory function of the dartos, and concluded that the scrotum is a local thermoregulator for the testicles. ANDREWS (1940), TYRELL, ANDREWS and ZELLE (1942), showed that the development and regulation of the thermoregulatory function is dependant upon testosterone production. The author in a series of publications on the surgical anatomy of the different constituents of the spermatic cord and scrotum, has studied the role of these structures in the thermoregulatory function of the testicle. The purpose of this paper is to review and present collectively the different factors envolved in the mechanism of the thermoregulatory function.
TL;DR: A new sensitive method has been developed for the biological assay of acetylcholine using a serosal strip of the rabbit fundus, which has the advantage of being highly sensitive to acetyl choline, in a dose of 0.5 ng/ml, particularly when eserinized.