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Search Results: 1 - 10 of 1233 matches for " Hamed Goodarzi "
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Identification of Bifidobacterium animalis, Bifidobacterium adolescentis and Bifidobacterium bifidum from Stool of Children and Detection of Their Antibacterial Properties  [PDF]
Mansour Amin, Ahmad Farajzadeh Sheikh, Hamed Goodarzi, Mehdi Sormeh
Advances in Infectious Diseases (AID) , 2013, DOI: 10.4236/aid.2013.33029
Abstract:

Introduction and Objective: The genus Bifidobacterium can generally be found in quantity in the habitats such as human and animal gastrointestinal tract, dental caries, vagina and oral cavity. The aim of this study was to isolate Bifidobacterium from stool and determine their inhibitory effect against some pathogens. Materials and Methods: 130 samples were collected by wet swabs and kept in sterile tubes containing MRS broth media. And Bifidobacterium isolated from stool was 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 from ethyl acetate solvent and the antimicrobial activity against some pathogenic bacteria, such as Salmonella typhi and Shigella sonnei, were investigated. Results: Eleven Bifidobacterium bifidum and four Bifidobacterium adolescentis, which were isolated from fresh stool, were identified by PCR. Antimicrobial substance from MRS broth medium was extracted. This antimicrobial compound showed a potent inhibitory activity against four tested bacteria. These bacteria produced acetic acid and lactic acid as inhibitory substances that were different from bacteriocins. Conclusion: Fresh stool may be used as a source of antimicrobial lactic acids bacteria, Bifidobacterium bifidum and adolescentis as two probiotics can establish themselves in gut and urogenital tract to prevent the human body from adverse effects of pathogens.

Detection of genomic mutations in katG, inhA and rpoB genes of Mycobacterium tuberculosis isolates using polymerase chain reaction and multiplex allele-specific polymerase chain reaction
Khosravi, Azar Dokht;Goodarzi, Hamed;Alavi, Seyed Mohammad;
Brazilian Journal of Infectious Diseases , 2012, DOI: 10.1590/S1413-86702012000100010
Abstract: objective: isoniazid (inh) and rifampin (rif) are the most effective first line antibiotics against mycobacterium tuberculosis. mutations in several genes determine resistance of m. tuberculosis to inh, with the most common gene target of katg, and resistance to rif is due to mutation in rpob gene. the aim of present study was to assess the mutations in the regions related to rif and inh resistance. methods: we characterized 80 clinical isolates of confirmed m. tuberculosis to analyze the most commonly observed inh and rif mutations. pcr analysis and sequencing were used to detect mutations related to rif and inh resistance. the multiplex allele-specific-pcr (mas-pcr) was performed as a comparative assay and for evaluation of this method. results: the sequencing of the 250-bp region of katg codon 315, revealed point mutations at 5 different codons in 13.7% of the m. tuberculosis isolates. the sequencing of the 270-bp central region of the rpob gene revealed point mutations at 7 different codons in 12 (15%) of the m. tuberculosis isolates. the results obtained with mas-pcr are in accordance with pcr-sequencing with high sensitivity and specificity for katg315, inha15, and rpob (531, 516, 526). conclusion: the results of this study suggested that molecular techniques can be used as a rapid tool for the identification of drug resistance in clinical isolates of m. tuberculosis. both dna sequencing and mas-pcr yielded high sensitivity for the detection of rif and inh mutations and detecting multi-drug resistant tuberculosis cases.
Comparison of Salivary Antioxidants in Healthy Smoking and Non-smoking Men
Hamid-reza Abdolsamadi,Mohammad-taghi Goodarzi,Hamed Mortazavi,Maryam Robati
Chang Gung Medical Journal , 2011,
Abstract: Background: Tobacco use is known as a serious global public health problem, and is alsoan important risk factor for oral diseases. Saliva is the first biological medium encountered during inhalation of cigarette smoke. Therefore, the mainaim of this study was to compare the levels of salivary antioxidants betweenhealthy smoking and non-smoking men.Methods: Unstimulated whole saliva samples were collected from 80 men. Forty subjects were smokers with a daily consumption of 20 cigarettes for at least 10years and 40 subjects were non-smokers. The salivary levels of uric acid,superoxide dismutase, glutathione peroxidase, and peroxidase were measured and compared between studied groups.Results: The mean levels of salivary superoxide dismutase, glutathione peroxidase,and peroxidase were significantly lower in smokers than non-smokers. Therewas no statistically significant difference in the salivary uric acid levelbetween smokers and non-smokers.Conclusions:Measurement of antioxidant agents in human saliva might be useful for estimating the level of oxidative stress caused by cigarette smoke
Educational Advisor System Implemented by Web-Based Fuzzy Expert Systems  [PDF]
Mahdi Hassani Goodarzi, Vahid Rafe
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.57058
Abstract: Using of the Internet technology and the field of Fuzzy expert systems has proposed new branches of sharing and distributing knowledge. However, there has been a general lack of investigation in the area of web-based Fuzzy expert systems (FES). In this paper the issues associated with the design, development, and use of web-based FES from a standpoint of the benefits and challenges of developing and using them. The original theory and concepts in conventional FES were reviewed and a knowledge engineering framework for developing them was revisited. Student in an educational place need an educational advisor for solve problems. Some of educational circulars order changing because advisor must update information away. The student's request is linguistic and crisp Expert System cannot solve problems completely. In my approach we build Web-Based Fuzzy Expert System for Student Education Advisor (FES-SEA) and stays in university portal. This system implemented with ASP.NET, SQL-SERVER 2008.
Psychiatric and family functioning in children with leukemia and their parents
Goodarzi A
Tehran University Medical Journal , 1999,
Abstract: The present study reports data from a cross-sectional investigation of the psychiatric and psychosocial functioning of 55 children diagnosed with acute lymphocytic leukemia and their families at three points in time: diagnosis (newly diagnosed), 1 year postdiagnosis, and 1 year after the completion of chemotherapy (offtherapy). Results reveal minimal psychopathology in these children and their parents based on self-and informantreports and structured diagnostic interviews. These families appear to be functioning adequately and report more family cohesiveness and marital satisfaction after chemotherapy was completed. Coping strategies commonly used by children and their parents include problem solving, a positive outlook, and good communication. Implications for psychiatric consultation are presented.
Optimizing The Application of SO2 in Apricot Drying
F Goodarzi
Journal of Science and Technology of Agriculture and Natural Resources , 2009,
Abstract: To optimize the use of sulfur in drying of apricot, four following treatments including: sulfiting and drying, sulfiting- blanching and drying, blanching- sulfiting and drying, and finally sulfiting- drying to % 50 of initial moisture- blanching and finish drying were studied. The levels of sulfur addition were from 0 to 1500 ppm, SO2 and drying was carried out at 50 to 74 °C. The quality of dried apricots was judged by extent of browning development and hardness determination. A response surface statistical design was applied to evaluate the quality of slabs and to determine optimum drying conditions. The results showed that sulfite was the major factor in controlling dried apricot quality. At present of sulfur, the role of temperature can be neglected. The amount of used sulfite has no significant effect on drying time of apricots. Blanching reduced drying time of product significantly. By increasing the drying temperature, loss percentage of SO2 was reduced for all treatments. Blanching and then sulfiting, increased loss in residual sulfur of products significantly. Application of sulfiting– drying method, using 900 ppm of SO2 at 50 to 68 °C was found to be the best treatment because of production of slabs whit average hardness and color texture equal to 1.44 N/m2 and 0.07 Od respectively.
Effect of Post-Harvest Application of Calcium on Quality and Shelf Life of Strawberry
F Goodarzi
Journal of Science and Technology of Agriculture and Natural Resources , 2009,
Abstract: Because of its tenderness, long distance between field and consumer locations and unsuitable condition of transportation, 30 – 40 percent of strawberry fruits is wasted during the transportation between field to markets. One of the recommended ways for cutting down the wastes of strawberry is application of calcium salts after harvest stage to increase the content of Ca2+ in fruit flesh. For this reason, the selected fruits were treated by immersing them in 0, 25, 50 and or 75 mmol/lit concentrations of CaSO4, CaCl2 or Ca(NO3)2 for 4 min. After drying in atmospheric tempetature, fruits were stored at 5°C for 5 and for 10 days. To evaluate the effect of calcium solutions on fruit quality, some quantitative and qualitative tests were carried out on them. The results showed that by increasing the concentration of calcium salts, the amount of acidity and calcium of fruits is significantly increased, but the percentage of mouldy fruits is decreased. In most cases, the 50 and 75 mmol /lit concentrations of CaSO4 showed similar effects. Among the different calcium solutions, Ca(NO3)2 had the best effect on improvement of fruit quality, such as increasing the calcium and firmness of fruit , but CaSo4 prohibited the moulding of fruits better than other solutions. By increasing the period of storage from 5 to 10 days, the amount of acidity and firmness decreased significantly, while mouldness percentage increased. The organoleptic test showed that when the concentration of CaCl2 and Ca(NO3)2 solutions is increased, the acceptability of treated samples is decreased by consumers. Because of the bitter taste, the least score was given to the samples treated by 75 mmol/lit concentration of Ca (NO3)2 solution. The panelists didn’t recognize any difference in taste between control and samples treated by 25 mmol/lit concentration of CaSO4 and CaCl2 solutions. None of the treatments showed initial attributes (tenderness and shape) of fruits after storage period. This method isn't recommended to increase the strawberrys' shelf life for home use, but it can be used for the ones which are to be consumed in food processing industries.
Convex Hull of Face Vectors of Colored Complexes
Afshin Goodarzi
Mathematics , 2012,
Abstract: In this paper we verify a conjecture by Kozlov (Discrete Comput Geom 18 (1997) 421--431), which describes the convex hull of the set of face vectors of $r$-colorable complexes on $n$ vertices. As part of the proof we derive a generalization of Tur\'{a}n's graph theorem.
Clique Vectors of $k$-Connected Chordal Graphs
Afshin Goodarzi
Mathematics , 2014,
Abstract: The clique vector $\mathfrak{c}(G)$ of a graph $G$ is the sequence $(c_1, c_2, \ldots,c_d)$ in $\mathbb{N}^d$, where $c_i$ is the number of cliques in $G$ with $i$ vertices and $d$ is the largest cardinality of a clique in $G$. In this note, we use tools from commutative algebra to characterize all possible clique vectors of $k$-connected chordal graphs.
Cellular structure for the Herzog--Takayama Resolution
Afshin Goodarzi
Mathematics , 2013,
Abstract: Herzog and Takayama constructed explicit resolutions for the class of so called ideals with a regular linear quotient. This class contains all matroidal and stable ideals. The resolutions of matroidal and stable ideals are known to be cellular. In this note we show that the Herzog--Takayama resolution is also cellular.
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