16 research outputs found

    Wp艂yw przekroju poprzecznego w艂贸kien oraz splot贸w tkackich na w艂a艣ciwo艣ci komfortu cieplnego tkanin poliestrowych

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    Thermal comfort properties, i.e. thermal conductivity, thermal absorption and thermal resistance, and the water vapour and air permeabilities of fabrics woven from different cross sectional shaped polyester fibres were investigated. A total of eight woven fabrics were produced in two different weave patterns (plain and twill) from polyester yarns of four different fibre cross sectional shapes (round, hollow round, trilobal and hollow trilobal). The fabrics consisting of hollow fibres had higher thermal conductivity and thermal absorption values but lower thermal resistance, water vapour and air permeability values than their counterparts of solid fibres. The twill fabrics produced from trilobal fibres showed the lowest thermal conductivity and thermal absorption but the highest thermal resistance, water vapour and air permeability.Badano w艂a艣ciwo艣ci komfortu cieplnego tkanin: przewodno艣膰 termiczn膮, absorpcj臋 oraz op贸r termiczny, jak r贸wnie偶 przepuszczalno艣膰 pary wodnej i powietrza. Wyprodukowano 8 tkanin stosuj膮c dwa r贸偶ne sploty (p艂贸cienny i uko艣ny) z prz臋dz poliestrowych wykonanych z w艂贸kien o czterech r贸偶nych kszta艂tach przekroju poprzecznego (okr膮g艂y, okr膮g艂y z otworem, tr贸jk膮tny, tr贸jk膮tny z otworem). W艂贸kna z lumenem posiada艂y wy偶sz膮 przewodno艣膰 termiczn膮 i wsp贸艂czynnik absorpcji, a ni偶sz膮 oporno艣膰 termiczn膮, przepuszczalno艣膰 pary wodnej i powietrza w stosunku do tkanin z w艂贸kien o pe艂nym przekroju. Tkaniny o splocie sko艣nym z w艂贸knami o przekroju tr贸jk膮tnym wykazywa艂y najni偶sz膮 przewodno艣膰 termiczn膮 i wsp贸艂czynnik absorpcji ale najwy偶sz膮 oporno艣膰 termiczna oraz przepuszczalno艣膰 pary wodnej i powietrza

    neurotoxicity

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    Usually, all newborns demonstrate high serum unconjugated bilirubin (UCB) level. UCB may induce adverse effects in the central nervous system. We aimed to evaluate the cytotoxic effects of UCB and the protective effects of docosahexaenoic acid (DHA) on astrocyte cell cultures. The viability of astrocyte cells decreased after UCB treatment in a dose-dependent manner. Pre-incubation of DHA prevents the cells from UCB-mediated neurotoxicity. Our results shown that UCB leads to inhibition of antioxidant enzymes superoxide dismutase (SOD), catalase and GPx activity and induction of apoptosis. But only 4-h pretreatment of DHA can suppress of UCB-mediated inhibition of antioxidant enzymes SOD, catalase and GPx activity and induction of apoptosis in astrocytes. Our results strongly indicated that DHA has a protective effect on UCB-mediated neurotoxicity through inhibition apoptosis and antioxidant enzymes activity of SOD, CAT and GPx in rat primer astrocyte cell lin

    The protective effect of docosahexaenoic acid on the bilirubin neurotoxicity.

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    Usually, all newborns demonstrate high serum unconjugated bilirubin (UCB) level. UCB may induce adverse effects in the central nervous system. We aimed to evaluate the cytotoxic effects of UCB and the protective effects of docosahexaenoic acid (DHA) on astrocyte cell cultures. The viability of astrocyte cells decreased after UCB treatment in a dose-dependent manner. Pre-incubation of DHA prevents the cells from UCB-mediated neurotoxicity. Our results shown that UCB leads to inhibition of antioxidant enzymes superoxide dismutase (SOD), catalase and GPx activity and induction of apoptosis. But only 4-h pretreatment of DHA can suppress of UCB-mediated inhibition of antioxidant enzymes SOD, catalase and GPx activity and induction of apoptosis in astrocytes. Our results strongly indicated that DHA has a protective effect on UCB-mediated neurotoxicity through inhibition apoptosis and antioxidant enzymes activity of SOD, CAT and GPx in rat primer astrocyte cell line
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