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686 articles for “Stress”
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Research ArticleOpen accessEvery word in the titleA Novel Rodent Model of Autism: Intraventricular Infusions of Propionic Acid Increase Locomotor Activity and Induce Neuroinflammation and Oxidative Stress in Discrete Regions of Adult Rat BrainDerrick F. MacFabe, Karina Rodríguez-Capote, Jennifer E. Hoffman et al.Innate neuroinflammatory changes, increased oxidative stress and disorders of glutathione metabolism may be involved in the pathophysiology of autism spectrum disorders (ASD). Propionic acid (PPA) is a dietary and gut bacterial short chain fatty acid which can produce brain and behavioral changes reminiscent of ASD following intraventricular infusion in rats. Adult Long-Evans rats were given intraventricular infusions of either PPA … …American Journal of Biochemistry and Biotechnology, Vol. 4, Issue 2 · 30 Jun 2008 · 12,618 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleOxidative Stress in Autism: Elevated Cerebellar 3-nitrotyrosine LevelsElizabeth M. Sajdel-Sulkowska, Boguslaw Lipinski, Herb Windom et al.It has been suggested that oxidative stress and/or mercury compounds play an important role in the pathophysiology of autism. This study compared for the first time the cerebellar levels of the oxidative stress marker 3-nitrotyrosine (3-NT), mercury (Hg) and the antioxidant selenium (Se) levels between control and autistic subjects. Tissue homogenates were prepared in the presence of protease inhibitors from … …American Journal of Biochemistry and Biotechnology, Vol. 4, Issue 2 · 30 Jun 2008 · 17,134 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleEffect of Organic and Inorganic Chromium Supplementation on Meat Quality of Heat-Stressed Broiler ChicksMajid Toghyani, Ali Khodami, Abbas Ali GheisariThis study examined the effect of different levels of dietary organic and inorganic chromium (Cr) on meat quality of broiler chicks reared under heat stress condition. Four hundred and twenty Ross male chickens in heat stress condition (33±3°C) were allocated to seven treatments in a completely randomized design. Treatments were supplemented with 0 (control), 500, 1000 or 1500 µg kg-1 … …American Journal of Animal and Veterinary Sciences, Vol. 3, Issue 2 · 30 Jun 2008 · 7,371 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleThe Effect of Corner Radii and Part Orientation on Stress Distribution of Cold Forging DieAhmad Baharuddin Abdullah, Kam Shwu Ling, Zahurin SamadOne of the most critical problems in cold forging is the huge stresses generated from the deformation of metal leads to die failure. The distribution of stresses mainly depends on geometry of the die. An approach to optimal design in cold forging die geometry and orientation are presented in this paper. The impression cold forging dies of the Universal joint … …American Journal of Applied Sciences, Vol. 5, Issue 4 · 30 Apr 2008 · 7,340 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleHormetic and Non-Hormetic Dose-Response Functions in Stress Effects on Memory and Synaptic Plasticity: Issues and MechanismsPhillip R. Zoladz, David M. DiamondOver a century of behavioral research has shown that stress can exert both positive and negative effects on memory. We have explored the idea that the complex effects of stress on learning and memory can be characterized by hormetic- and non-hormetic dose-response functions, in which stress may either stimulate or impair brain memory mechanisms, depending, in part, on the timing … …American Journal of Pharmacology and Toxicology, Vol. 3, Issue 1 · 31 Mar 2008 · 8,188 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleHormesis and Exercise: How the Cell Copes with Oxidative StressLi Li Ji, Zsolt Radak, Sataro GotoContraction-induced production of reactive oxygen and nitrogen species has been shown to cause oxidative stress to skeletal muscle, heart and other organs. As an adaptive response, muscle antioxidant defense systems are upregulated in response to exercise to restore intracellular prooxidantantioxidant homeostasis. Thus, both young and old animals and humans involved in regular exercise have shown reduced oxidative damage during acute … …American Journal of Pharmacology and Toxicology, Vol. 3, Issue 1 · 31 Mar 2008 · 7,818 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleVariations in Four Genotypes of Lentil under NaCl-Salinity StressM. Sidari, C. Santonoceto, U. Anastasi et al.Four lentil cultivars, Eston (E), Rossa of Castelluccio (RC), Pantelleria (P) and Ustica (U) differing in salt sensitivity, were examined for osmolyte contents and activities of α-amylase, β-amylase and α-glucosidase enzymes involved in seed germination, in absence as well as in presence of 50, 100, 150 and 200 mM NaCl. The inhibitory effects of NaCl differed, depending on the genotypes … …American Journal of Agricultural and Biological Sciences, Vol. 3, Issue 1 · 31 Mar 2008 · 8,711 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleStress and Job Satisfaction among Air Force Military PilotsKhodabakhsh Ahmadi, Kolivand AlirezaStress induces impairment of performance is a relatively common issue in pilots of military aviation. The present study aimed at gathering preliminary data on the relationship between stress and job satisfaction among military pilots, so determine to what extent military pilots suffering from job satisfaction. This study was cross- sectional in design and used survey methodology. The survey was offered … …Journal of Social Sciences, Vol. 3, Issue 3 · 30 Sep 2007 · 10,963 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleModeling of Stress- Strain Curves of Drained Triaxial Test on SandAwad Al- Karni, Abdulhafiz AlshenawyThis paper presents a hyperbolic mathematical model to predict the complete stress-strain curve of drained triaxial tests on uniform dense sand. The model was formed in one equation with many parameters. The main parameters that are needed to run the model are the confining pressure, angle of friction and the relative density. The other parameters, initial and final slopes of … …American Journal of Applied Sciences, Vol. 3, Issue 11 · 30 Nov 2006 · 6,845 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleSoluble Proteins, Proline, Carbohydrates and Na+/K+ Changes in Two Tomato (Lycopersicon esculentum Mill.) Cultivars under in vitro Salt StressFariba Amini, Ali A. EhsanpourThe effect of NaCl stress on soluble proteins, proline, carbohydrates and Na+/K+ of two tomato (Lycopersicon esculentum Mill.) cultivars Isfahani and Shirazy were studied. Seeds were germinated on medium containing only water agar, then transferred to MS medium supplemented with different concentrations of NaCl (0, 40, 80, 120 and 160 mM) for 21 days. Increasing of salinity resulted in increasing … …American Journal of Biochemistry and Biotechnology, Vol. 1, Issue 4 · 31 Dec 2005 · 8,773 accessesView PDFCite