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Articles by M. Amin
Total Records ( 4 ) for M. Amin
  S. Amear , S. Ariffin , Adzuieen Nordin , Norsheila Buyamin , M. Amin and A. Majid
  The research presents a study on chillers performance at a gas district plant during peak and off peak periods for campus cooling. The plant is designed to produce electrical power and chilled water from a Co-generation System and supply the chilled water and electricity to the campus. Since the campus chilled water supply depends solely from the chillers operations, the status of the performance of the chillers need to be continuously evaluated. Using Coefficient of Performance (COP), the performances for both the absorption and electric chillers were analysed. This COP analysis is the follow up from the earlier evaluation which was done in the year 2005. Results of the analysis indicate that there is a decrease in performance for the year 2011 in comparison to the year 2005. In terms of chilled water production the performance decreases approximately by 5%. While in terms of coefficient of performance there is a decrease by 43% from the year 2005 for the absorption chillers and 32% increase for Electric the chillers.
  N. A Azim , M Al Gelani and M. Amin
 

Through supervising local competitions and following up the training of some games at the under 13-year-old level, the authors observed that coaches at that stage are not professionally trained to deal with junior players. Coaches seem unaware of the real objective behind training those junior players or of holding competitions for them: the coaches focus on one goal only, which is wining the match. This perspective puts the players under heavy psychological pressures and the fear of committing mistakes and bringing defeat to their team. Therefore, the authors sought to identify coaches' behaviour and their ability to deal with beginners under 13 years old. This study aimed to identify the training behaviour of football coaches for junior teams. The study included 40 randomly selected coaches of junior teams in Egypt, aged 30-40 years and with 6±1 total years of experience. The authors developed a written questionnaire as a self-report named training behaviour for coaches. Statistical calculations included correlations between items, Cronbach's of the total questionnaire, and principal component factor analysis with oblique rotation. The value of coefficient =(0.769) while the ratio of continuous flow intersection=(61.8%). Factor analysis produced five factors that explained 62% of the variance. The first factor included self-efficacy items, the second included communication items, the third included self-confidence, the fourth included controlling, and the fifth included commitment. The results indicated a low content related to training behaviour for football coaches of junior teams, which indicates a need for preparing coaches of junior teams through specialised educational programmes before allowing them to train junior players.

  N. Jomezadeh , A. Farajzadeh Sheikh , A.D. Khosravi and M. Amin
  The aim of present study is to apply the PCR method for detection of stx1 and stx2 genes in E. coli strains isolated from stool samples. Shiga Toxin-producing Escherichia coli (STEC) have emerged as pathogens that can cause food-borne infections and severe and potentially fatal illnesses in humans, such as Haemorrhagic Colitis (HC) and Haemolytic Uraemic Syndrome (HUS). Of the numerous serotypes of E. coli that have been shown to produce stx, E. coli O157:H7 are frequently implicated in human disease. So, due to serious infections associated with STEC in human, early recognition of STEC is critical for effective treatment of patients. In total 130 isolates of E. coli were recovered from patients by using standard identification procedures. The isolates were subjected to PCR technique for investigation of presence stx1 and stx2 genes.Results revealed the presence of stx1 in 20 isolates (35.5%), stx2 in 28 isolates (49.1%) and stx1 and stx2 both in 9 isolates (15.7%). The present study shows the relatively high prevalence of STEC producing stx1 and stx2 in the region of study. The higher detection rate of stx2 represented the important role of this gene in diarrheal diseases.
  M. Amin , M. Jorfi , A.D. Khosravi , A.R. Samarbafzadeh and A. Farajzadeh Sheikh
  Lactobacillus is a genus of lactic acid bacteria described as a heterogeneous group of regular non spore forming gram positive rods and found in a great variety of habitats such as plants and gastrointestinal tracts. The aim of this study was to isolate lactobacilli from plants and determine their inhibitory effect against some pathogens. Sixty lactobacilli isolates from fresh vegetables were enriched in Man-Rogosa-Sharpe medium (MRS) broth and isolated by growing on MRS agar medium and characterized by phenotypic characteristics and PCR technique at genus and species levels. The antimicrobial substance was extracted with ethyl acetate solvent and the antimicrobial activity against some pathogenic bacteria such as Escherichia coli, Salmonella typhi, Shigella dysenteriae, Bacillus anthracis and Staphylococcus aureus were investigated. Forteen L. plantarum and eight L. casei which were isolated from fresh vegetables were identified by PCR. Antimicrobial substance from MRS broth medium was extracted. This antimicrobial compound showed a potent inhibitory activity against all tested bacteria. The inhibitory substance was distinct from bacteriocins, lactic and acetic acids which are produced by these bacteria. In conclusion, fresh vegetables may be used as a source of antimicrobial lactic acid bacteria. L. casei and L. plantarum as two probiotics can establish themselves in gut and urogenital tract and prevent the human body from adverse effects of pathogens.
 
 
 
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