نتایج جستجو برای: oxygen stress
تعداد نتایج: 623070 فیلتر نتایج به سال:
Porphyromonas gingivalis, a Gram-negative anaerobe associated with adult periodontitis, expresses numerous potential virulence factors. dnaK, a member of the heat shock protein family, functions as a molecular chaperone and plays a role in microbial pathogenicity. However, little is known regarding its gene expression caused by oxygen stress in P. gingivalis. In the present study, a custom-made...
Patients with aortic stenosis are susceptible to myocardial ischemia during hemodynamic stress, which may be caused by two mechanisms. First, vascular abnormalities inherent in myocardial hypertrophy may impair coronary vasodilation, limiting the ability to increase coronary blood flow to meet increased metabolic demands. Second, aortic stenosis itself may cause an imbalance between oxygen supp...
Background and aims: The use of hyperbaric oxygen therapy is one of the treatment methods to treat many diseases and injuries such as decompression sickness, wound healing, carbon monoxide poisoning, thermal burns, and nervous system injuries. This article aims to review the possible mechanisms of the effectiveness of this treatment in neurological injuries according to the available studies...
in determining the physiological or physio-pathological function of oxygen reactive spices. Release of reactive oxygen species (ROS) in dermal wounds, leads to necrosis as well as apoptosis and tissue loss. Management of the risk factors for tissue loss due to flap failure can reduce risk factors with resultant improvement in the survival and efficacy of the flaps. Materials and Methods: 40 Spr...
Reactive oxygen species (ROS) are reactive oxygen metabolites resulting from one-electron reduction of oxygen under the influence of a variety of enzymes. In aerobic organisms, they are produced as a byproduct of many cellular metabolic pathways and participate in some processes necessary for the normal life and functioning of the cells, but also in a large number of pathological processes. Oxi...
During pregnancy, development of the placenta is interrelated with the oxygen concentration. Embryo development takes place in a low oxygen environment until the beginning of the second trimester when large amounts of oxygen are conveyed to meet the growth requirements. High metabolism and oxidative stress are common in the placenta. Reactive oxidative species sometimes harm placental developme...
There has been much evidence demonstrating the involvement of oxidative stress in the pathology of neurological disorders. Moreover, the vulnerability of the central nervous system to reactive oxygen species mediated injury is well established since neurons consume large amounts of oxygen, the brain has many areas containing high iron content, and neuronal mitochondria generate large amounts of...
We investigate instability mechanisms in amorphous In-Ga-Zn-O transistors based on bias and illumination stress-recovery experiments coupled with analysis using stretched exponentials and inverse Laplace transform to retrieve the distribution of activation energies associated with metastable oxygen defects. Results show that the recovery process after illumination stress is persistently slow by...
Free radicals derived from molecular oxygen and nitrogen are highly reactive metabolites called reactive oxygen species (ROS). Cells continuously produce free radicals and ROS as part of the metabolic process. They are involved in the various functions of the reproductive system. Antioxidants are enzymes or compounds that scavenge and reduce the presence of free radicals. Normally, a balance ex...
The NRF2 (also known as NFE2L2) transcription factor is a critical regulator of genes involved in defense against oxidative stress. Previous studies suggest thatNrf2plays a role in adipogenesisin vitro, and deletion of theNrf2gene protects against diet-induced obesity in mice. Here, we demonstrate that resistance to diet-induced obesity inNrf2(-/-)mice is associated with a 20-30% increase in en...
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