نتایج جستجو برای: aging
تعداد نتایج: 103665 فیلتر نتایج به سال:
introduction: accumulating evidences indicated that during increasing of the animals' age, the number and the functional properties of hematopoietic stem cells (hscs) become altered because of a gradual decrease in replication potential. the efficient factors in this process are dna damaging, reduced telomerase activity, shortening of telomeres and oxidative stresses. for overcoming these fact...
background: the progressive accumulation of misfolded and aggregated proteins in neurons is an accepted mechanism in aging. overproduction of reactive oxygen species (ros), referred to as oxidative stress, is currently believed to play a pivotal role in this process. lipofuscin as a histological index of aging results from cross-links between oxidized proteins and lipids. therefore, to attenuat...
introduction: the brain renin-angiotensin system (ras) has been reported having a pathological role in age-related impairment in learning and memory. therefore, angiotensin converting enzyme inhibitors (acei) are expected to have positive effects on memory. longtime treatment with captopril (an angiotensin converting enzyme inhibitor) significantly attenuates the age-related impairment in learn...
introduction: resin composites are an important part of restorative treatment in modern dentistry. there are many trademarks available in iran market and physico-chemical properties of many of these resin composites are not evaluated yet. this study was carried out to evaluate the physico-chemical properties of four available resin composites and also to assess the effect of aging on their prop...
a female one month old with features supporting a diagnosis of neonatal progeroid syndrome(wrs) presented to our neonatology section of gb pant children hospital srinagar .she had prenatal and post natal growth failure, generalized lipotrophy, triangular face, psedohydrocephalous, sparse scalp hair and eye brows, prominent scalp veins and greatly widened anterior fontenella.
introduction: given growing elderly population and high prevalence of oral and dental diseases in this age group, this study was conducted to investigate oral health status and related quality of life among older adults in yazd located in central iran. methods: the cross sectional study was carried out on 210 elderly people aged ≥ 60 years under the guise of yazd health care centers who entered...
the old newsprint, as an important grade of waste papers, usually has been produced from chemicalmechanical pulp (cmp). although the effect of paper aging on different properties of recycled pulp has been investigated from long time ago; but, few studies have been observed about the effect of this phenomenon on recycling of cmp paper. in this study, accelerated aging was applied on hardwood cmp...
Objectives: In this paper, aging with its different dimensions is discussed. The characteristics of elderly's life in relation to individual, social, and changes meet aging together with attitudes toward it and major components of elderly are explained. Disease and burden of disease of aging as a central to the areas of Health and Health Economics will be emphasized. The influential factors on ...
This study was conducted to evaluate the effects of accelerated aging and natural storage on seed germination and seedling heterotrophic growth of chickpea in Gorgan University of Agricultural Sciences and Natural Resources in 2014. The experiment was carried out, adopting a completely randomized design with four replications. Treatments were 8 aging levels (i.e., 2 years, and 4 years natural s...
Autobiographical memory, or memory for personal experiences, allows individuals to define themselves and construct a meaningful life story. Current research aims to review the definition and theories of autobiographies memory and how it usually changes or abnormally in older adults. Base on studies, as we grow older autobiographical memory drops off, also semantic memory changes a little or som...
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