Search Results

You are looking at 1 - 10 of 10 items for

  • Author or Editor: S. Hussein x
  • Refine by Access: All Content x
Clear All Modify Search

Abstract  

A well performance Electrolytic Controlled Etching (ECE) unit has been designed and constructed in our laboratory. Low electric field strength of few volts and a 2 kHz wave signals has been applied across the electrodes that confined the 9 and 12 μm thick PET foils in the ECE unit. PET foils were exposed to fission fragments (FFS) using 252Cf source. The dependence of different measurable parameters such as FFS fluence (Φ), applied voltage (V), etching temperature (T) and etching concentration (C) on both track etch rate (V T) and breakthrough time (T B) have extensively been studied using the FFS-irradiated PET foils. Various empirical relationships connecting the results of the present work have been extracted. Moreover, the constructed ECE technique has proven to be an encouraged time saving method in the development of trusting measurements comparing with others that might involve expensive sophisticated tools.

Restricted access

Fifteen batches of stirred youghurt were made to study the effect of microentrapment on the viability of bifidobacteria and their ability to inhibit the growth ofE. coliandStaph. aureus. Entrapped cells ofBifidobacterium bifidumandBifidobacterium infantiswere able to produce antimicrobial agents which inhibitedE. coliandStaph. aureusused as test organisms. Viable counts of unentrapped bifidobacteria decreased sharply, while entrapped cells of bifidobacteria were quite stable during refrigerated storage of stirred yoghurt.Bif. infantiswas more tolerant to storage conditions thanBif. bifidum. Microentrapment of bifidobacteria improved their survival during storage of stirred yoghurt, especiallyBif. bifidum, whose viability was not significantly (P≯0.05) different from entrappedBif. infantis. Viable counts ofE. colidecreased during storage of stirred yoghurt. Addition to bifidobacteria caused a sharp decrease in the viability ofE. coli.E.coligrowth was not detected at the 5th day, when entrapped cells of bifidobacteria were added to stirred yoghurt, whileE. coligrowth was not detected at the 7th day of storage in yoghurt containing unentrapped bifidobacteria. Addition ofBif. bifiduminhibited the growth ofE. colimore effectively thanBif. infantis. Staph. aureusshowed similar patterns toE. coli, except theStaph. aureuswas more tolerant to storage conditions. The counts of total bacteria, lactobacilli andStreptococcus salivariussubsp.thermophilusincreased up to the third day then declined till the end of storage. Titratable acidity increased gradually during the first 3 days of storage then increased slightly up to the end of storage, while pH values dropped during storage. Adding bifidobacteria,E. coliandStaph. aureusdid not affect significantly (P≯0.05) the counts of lactobacilli andStr. salivariussubsp.thermophilus, acidity and pH value.

Restricted access

Buffalo and cow milk caseins were submitted to hydrolysis either with á -chymotrypsin or with pepsin. Enzymatic peptide modification (EPM) was carried out by using L-methionine ethyl ester in the reaction mixture. As catalyst, á -chymotrypsin or pepsin was used. The incorporation of methionine in to the peptide chains in the presence of á -chymotrypsin showed an optimum value at 0.14 g Met added to the reaction mixture/1 g hydrolysate in both cases. In the case of pepsin used as catalyst, the optimal Met-enrichment was at 0.14 g Met added to the reaction mixture/1 g buffalo casein hydrolysate and at 0.34 g Met/1 g cow casein hydrolysate. The covalent nature of the amino acid incorporation was confirmed by SDS - polyacryl amide gel electrophoresis in the presence of urea. Electrophoretic patterns of the products indicate that transpeptidation plays an essential role in the EPM reaction. Antigenic character of the EPM- products was investigated in vitro by competitive indirect ELISA. Enzymatic peptide modification with methionine enrichment seems to be an efficient method for the reduction of the antigenic/potential allergenic character and for the improvement of the nutritive value of buffalo and cow milk caseins.

Restricted access

Abstract  

The formation of cationic astatine /I/-coordination compounds with selenium-containing neutral ligands is described. The detection of compound formation and first physico-chemical data on the characterization of this new group of At/I/-compounds were obtained by investigation of their electromigration behaviour in free electrolytes. Se-donors coordinate more strongly to At/I/ than ligands containing carbamide and thiocarbamide. This fact is proved by electromigrational studies on the exchange of N,N-ethyleneselenocarbamide, respectively N,N-ethylenethiocarbamide with iodide.

Restricted access

Abstract  

The ion mobilities of [211At] At(I) in dependence on thiourea (tu) concentration, iodide concentration and a mixture of both ligands were measured by the electromigration method in free electrolytes. An equilibrium model was developed for the characterization of electromigration curves which permitted the calculation of stability constants and ion mobilities of the complexes [AtI], [AtI2], [Attu]+, [Attu2]+ and [AtItu] existing in these solutions. Ethanol and water served as solvents. The temperature was 298 K and the ionic strength was about 0.05 mol/dm3.

Restricted access

Bnctm rock inscriptions

An analytic study of new discovered Safaitic inscriptions from Deir al-Kahf in the Northeast of Jordan

Acta Antiqua Academiae Scientiarum Hungaricae
Authors:
Hussein M. Al Qudrah
,
Ibrahim S. Sadaqah
, and
Mahdi Alzoubi

This paper studies nine memorial Safaitic inscriptions from the town of Deir al-Kahf in Northern Badiyah, northeast of Jordan, along the Baghdad Highway road. The first seven are found to the east of the town, the other two are from the far north end. It seems that these inscriptions show the sadness and grief over an important person called Bnctm. The paper deals with the verbs and names semantically and syntactically, also considering their parallels in other Semitic languages.

Restricted access
Acta Physiologica Hungarica
Authors:
S. Eleawa
,
I. Bin-Jaliah
,
M. Alkhateeb
,
N.M.K. Bayoumy
,
R. Alessa
, and
Hussein Sakr

Gastric ulcer is a common gastrointestinal disease. One suggested mechanism is increased oxidative stress. Puplished data showed that dehydroepiandrosterone (DHEA) may limit oxidative stress and lipid peroxidation.

Restricted access
Pollack Periodica
Authors:
Ali J. Mohammed
,
Hussein Hayder Mohammed Ali
,
Anwar S. Barrak
,
A. M. Hussein
, and
Murad Ramadan Mohammed

Abstract

A computational model is developed to investigate the convective heat transfer properties and the fluid flow characteristics of cupric oxide - water nano-fluid in a horizontal circular pipe aiming to provide insights into optimizing heat transfer in such systems. A twisted tape with varied twist ratios is inserted. This quantitative investigation used five Reynolds number from 4,000 to 12,000 under a uniform heat flux scenario of 25,000 W m−2. All experiments were performed as a single-phase fluid with cupric oxide values of 0, 0.4, 1, and 2% by volume. By reducing the twist ratio and increasing volume concentration, the average heat transfer coefficient of cupric oxide-water nano-fluid was improved. For a twist ratio of 4D, the maximum heat transfer improvement was 228% greater than the plain pipe. The presence of twisted tape with modest step ratios causes the friction factor to grow.

Restricted access

Two parts of the plant Capparis aegyptia, leaves and fruits, were extracted successfully with 4 different solvents. These solvents namely n-hexane, diethyl ether, ethyl acetate and ethanol. These extracts were tested for their toxicity against eggs and adult females of the two-spotted spider mite, Tetranychus urticae Koch. Extracts of both parts of the plant, prepared from various solvents were affected the behavior, toxicity and fecundity of females under laboratory conditions. Ethyl acetate extract of leaves and fruits was the most potent extract tested against eggs and adult females of T. urticae. In contrast, ethanol extract of fruits was the least effective extract against both tested stages. The egg stage was less susceptible to most different extracts of both parts of C. aegyptia. Leaf discs treated with LC50 concentration of various extracts showed a high percentage of repellency in case of ethanol extract from leaves and fruits (86.67 and 96.42%), respectively. Treated females with LC50 concentration of different extracts showed a higher remarkable percentage of mortality as well as a reduction in the total number of eggs laid during 15 days with fruit extracts than that with leaves extract.

Restricted access

Summary

A simple, selective, precise, and stability-indicating thin-layer chromatographic method has been developed and validated for analysis of some angiotensin II receptor antagonists (AIIRAs), namely, Losartan potassium (Los-K), Irbesartan (Irb), and Candesartan cilexetil (Cand) in the bulk drug and in pharmaceutical formulations (tablets). The method was based on using TLC plates pre-coated with silica gel G 60 on aluminum sheets as stationary phase and the development system was performed using chloroform:methanol (9:1) giving well separated and compact spots for all the studied drugs (R F values 0.41–0.53). The separated spots were characterized by viewing under the UV lamp, then visualized as orange spots by spraying with Dragendorff's reagent and measured by densitometry. Under the optimum chromatographic conditions, linear relationships were obtained between response and concentrations of each studied drug with high correlation coefficients (0.9985–0.9994). Good accuracy and precision were successfully obtained for the analysis of tablets containing each drug alone or combined with diuretic drug hydrochlorothiazide (HCTZ). No interferences could be observed from the co-formulated HCTZ, commonly encountered excipients present in tablets as well as the degradation products. The results were compared successfully with reported methods and can be used as a stability-indicating assay.

Open access