Preterm infants exposed to high concentration oxygen are prone to develop hyperoxic lung damage, which is an importan t underly ing cause of bronchopulmonary dysplasia (BPD).1 Although the causative agent for BPD has not been conclusively identified, hyperoxia-induced lung injury i s bel ieved to be a major factor. Data from both cellu lar and whole animal models suggest that hyperoxic lung dam...

catharantus-roseus is a medicinal and ornamental plant with growing attention toward its economical value. to determine cell viability based on trypan blue  and  mtt assay, cell suspension from callus of catharantus-roseus were treated with different concentrations of cadmium-nitratee for 1, 3 and 6 days.  also cell suspension was used to investigate the cell morphology for a period of 3 days u...

This work was aimed to explore the efficacy of activated charcoal (5 mg g-1 soil) in abating fluoride (25 L-1 NaF) stress rice seedlings, since protective role is widely reported against other forms abiotic stress. Application NaF solution reduced germination rate, dry and fresh weight, shoot root length seedlings. Extensive accumulation lowered chlorophyll level along with higher electrolyte l...

Arsenic uptake by plants is species-specific and its level in terrestrial of uncontaminated sites ranged from 0.009 to 1.5 mg/kg. Plants with high metal or metalloid capability their biomass are called hyperaccumulators. The most efficient arsenic (As) hyperaccumulator belongs Pteridaceae species Pteris vittata L. Pityrogramma calomelanos L., both can accumulate more than 8000 mg/kg As above-gr...

Site-directed mutants of prostaglandin-endoperoxide synthase-2 (PGHS-2) with changes in the peroxidase active site were prepared by mutagenesis, expressed in Sf-9 cells, and purified to homogeneity. The distal histidine, His193, was mutated to alanine and the distal glutamine, Gln189, was changed to asparagine, valine, and arginine. The guaiacol peroxidase activities of H193A, Q189V, and Q189R ...

Phytopathogenic fungi such as the rice blast fungus Magnaporthe grisea are unique in having two catalase/peroxidase (KatG) paralogues located either intracellularly (KatG1) or extracellularly (KatG2). The coding genes have recently been shown to derive from a lateral gene transfer from a (proteo)bacterial genome followed by gene duplication and diversification. Here we demonstrate that KatG1 is...

Fig is a very perishable fruit with short postharvest life. Low-cost techniques should be employed to reduce fresh fig losses. The purpose of this study was design passive modified atmosphere packaging (PMAP) extend the shelf-life ‘Dottato’ figs stored at 4 °C for 21 days. Physico-chemical traits and enzymatic non-enzymatic antioxidant systems were evaluated. Storage in PMAP reduced losses weig...

 The effect of sodium silicate (Si) and potassium (K) were investigated on the major antioxidant enzyme activities in two different grapevine cultivars (Vitis vinifera L., cvs Yezandai and Malinger Ramfi) under drought stress. The traits included superoxide dismutase (SOD, EC 1.15.1.1), catalase (CAT, EC 1.11.1.6), peroxidase (POD, EC 1.11.1.7), guaiacol peroxidase (GPX, EC 1.11.1.7), ascorbate...

in order to evaluate the effects of drought stress and spraying of salysilic acid and chitosan on photosynthetic pigments and antioxidant enzymes of safflower an experiement was conducted as split plot randomized complete block design at the zabol university research farm in zabol, south iran during 2012. treatments were drought stress at three levels; irrigation when the soil moisture level dr...

this study was performed to investigate the effect of putrescine and spermine on some physiological and biochemical characteristics and antioxidant enzymes activity of peach (prunus persica cv. alberta) and almond (prunus dulcis cv. rabi) seedlings under water deficit. the first factor was water regime at two levels (80% or 50% of soil available water), and the second factor was polyamine treat...