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Mohammad‑Taher Moradi,Kheirollah Yari,Zohreh Rahimi 한국유전학회 2017 Genes & Genomics Vol.39 No.11
Helicobacter pylori infection could induce oxidative stress. Oxidative stress is involved in the pathogenesis of gastric diseases. Glutathione peroxidase 1 (GPX1), is part of the enzymatic antioxidant defense, preventing oxidative damage. The aim of the present study was to assess the association of GPX1 Pro198Leu genotypes with gastric cancer in patients with and without H. pylori infection in a population of Northern Iran. The present case-control study consisted of 50 patients with gastric cancer and 78 cancer-free subjects as controls. Extraction of DNA was performed on bioptic samples and the GPX1 genotypes were identified using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method. The frequencies of GPX1 Pro/Pro, Pro/Leu and Leu/Leu genotypes in controls were 21.8, 71.8 and 6.4%, respectively. However, in gastric cancer patients, the frequencies of 34, 56 and 10% were observed for Pro/Pro, Pro/Leu and Leu/Leu genotypes, respectively (p = 0.185). In 38 (76%) patients infected with H. pylori, the frequencies of Pro and Leu alleles were 94.7 and 3.3%, respectively. There was a higher frequency of combined genotype of Pro/Leu + Leu/ Leu (94.7%) in H. pylori positive patients than that in patients without H. pylori infection (75%, p = 0.047). The presence of this genotype tended to increase the risk of H. pylori related gastric cancer by 5.88–fold (p = 0.069) in our population. Our findings indicated the absence of association between the GPX1 Pro198Leu polymorphism and the risk of gastric cancer in an Iranian population. However, we detected an association between H. pylori related gastric cancer with GPX1 Pro/Leu + Leu/Leu genotype.
Effect of Repeated Freeze-Thaw Cycles on Beef Quality and Safety
Mohammad Hafizur Rahman,Mohammad Mujaffar Hossain,Syed Mohammad Ehsanur Rahman,Mohammad Abul Hashem,오덕환 한국축산식품학회 2014 한국축산식품학회지 Vol.34 No.4
The objectives of this study were to know the effect of repeated freeze-thaw cycles of beef on the sensory, physicochem-ical quality and microbiological assessment. The effects of three successive freeze-thaw cycles on beef forelimb were inves-tigated comparing with unfrozen fresh beef for 75 d by keeping at -20±1°C. The freeze-thaw cycles were subjected to threethawing methods and carried out to know the best one. As the number of freeze-thaw cycles increased color and odor de-clined significantly before cook within the cycles and tenderness, overall acceptability also declined among the cycles aftercook by thawing methods. The thawing loss increased and dripping loss decreased significantly (p<0.05). Water holdingcapacity (WHC) increased (p<0.05) until two cycles and then decreased. Cooking loss increased in cycle 1 and 3, but dec-reased in cycle 2. pH decreased significantly (p<0.05) among the cycles. Moreover, drip loss, cooking loss and WHC wereaffected (p<0.05) by thawing methods within the cycles. 2-Thiobarbituric acid (TBARS) value increased (p<0.05) graduallywithin the cycles and among the cycles by thawing methods. Total viable bacteria, total coliform and total yeast-mould countdecreased significantly (p<0.05) within and among the cycles in comparison to the initial count in repeated freeze-thawcycles. As a result, repeated freeze-thaw cycles affected the sensory, physicochemical and microbiological qua- lity of beef,causing the deterioration of beef quality, but improved the microbiological quality. Although repeated freeze-thaw cyclesdid not affect much on beef quality and safety but it may be concluded that repeated freeze and thaw should be minimizedin terms of beef color for commercial value and WHC and tenderness/juiciness for eating quality.
Mohammad Zabetian,Mohammad Hassan Saidi,Mohammad Said Saidi,Mohammad Behshad Shafii 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.3
Particle manipulation using laser beam is almost a new and contactless technique in particulate sciences. The method is based on theradiation pressure of light photons on the particles suspended in a semi-transparent fluid. Applications of the technique mainly covermicroscopic separation and detection of biological objects. In this work, a theoretical study is conducted to investigate the hydrodynamicand thermal effects on a particulate flow in a mini-channel. Laser thermal effects are studied as a result of light absorption either in fluidor dispersed phase. An analytical model is developed to be the real simulator of a test bed developed by the authors. The main objectiveof performed simulation is to determine the conditions of hydrodynamic laser-particle interaction and the contribution of thermal effects. More specifically, the criteria for size of particles and beam parameters to meet the mentioned conditions are presented. The model resultsare used for design and selection of elements in a particle manipulation system.
Improvement in DRX Power Saving for Non-real-time Traffic in LTE
Mohammad Tawhid Kawser,Mohammad Rakibul Islam,Khondoker Ziaul Islam,Mohammad Atiqul Islam,Mohammad Mehadi Hassan,Zobayer Ahmed,Rafid Hasan 한국전자통신연구원 2016 ETRI Journal Vol.38 No.4
A discontinuous reception (DRX) operation is included in the Long Term Evolution (LTE) system to achieve power saving and prolonged battery life of the user equipment. An improvement in DRX power saving usually leads to a potential increase in the packet delay. An optimum DRX configuration depends on the current traffic, which is not easy to estimate accurately, particularly for non-real-time applications. In this paper, we propose a novel way to vary the DRX cycle length, avoiding a continuous estimation of the data traffic when only non-real-time applications are running with no active real-time applications. Because a small delay in non-real-time traffic does not essentially impact the user’s experience adversely, we deliberately allow a limited amount of delay in our proposal to attain a significant improvement in power saving. Our proposal also improves the delay in service resumption after a long period of inactivity. We use a stochastic analysis assuming an M/G/1 queue to validate this improvement.
Building structural health monitoring using dense and sparse topology wireless sensor network
Mohammad E. Haque,Mohammad F.M. Zain,Mohammad A. Hannan,Mohammad H. Rahman 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.16 No.4
Wireless sensor technology has been opened up numerous opportunities to advanced health and maintenance monitoring of civil infrastructure. Compare to the traditional tactics, it offers a better way of providing relevant information regarding the condition of building structure health at a lower price. Numerous domestic buildings, especially longer-span buildings have a low frequency response and challenging to measure using deployed numbers of sensors. The way the sensor nodes are connected plays an important role in providing the signals with required strengths. Out of many topologies, the dense and sparse topologies wireless sensor network were extensively used in sensor network applications for collecting health information. However, it is still unclear which topology is better for obtaining health information in terms of greatest components, node\'s size and degree. Theoretical and computational issues arising in the selection of the optimum topology sensor network for estimating coverage area with sensor placement in building structural monitoring are addressed. This work is an attempt to fill this gap in high-rise building structural health monitoring application. The result shows that, the sparse topology sensor network provides better performance compared with the dense topology network and would be a good choice for monitoring high-rise building structural health damage.