background: we aimed at evaluating the toxicity effects of low (subtoxic) concentrations of silver nanoparticles (agnp, 5-10 nm) in human hepatoblastoma (hepg2) cell line after and during a period of about one month. methods: xtt and mtt assays were used to draw a dose-response curve ic50 (half maximal inhibitory concentration) value of the agnp on hepg2 cells was calculated to be 2.75-3.0 mg/l...

This study was conducted to determine the effect of dietary turmeric rhizome powder (TRP) as a natural antioxidant, and soybean oil, canola oil and tallow on lipid metabolism, blood metabolites, immune system, and antioxidant status of broiler chickens before (BHS, 28 d) and after exposure to heat stress (AHS, 42 d). Seven hundred and ninety two d-old male Arian broilers were randomly allotted ...

AIMS/BACKGROUND Oxidative damage has been proposed to be involved in the pathogenesis of age-related macular degeneration (ARMD). The purpose of this study was to evaluate whether red blood cell antioxidant enzyme activity correlates with severity of aging maculopathy in affected individuals. METHODS Blood samples were obtained from 54 patients with varying severity of aging maculopathy and 1...

antioxidant activity of aerial part of cytisus scoparius, link (family leguminosae) was studied both by in vitro and in vivo models. different concentrations of different extracts of chloroform, ethyl acetate, methanol and hydroalcoholic extracts of plant were investigated for in vitro antioxidant activity using the thiocyanate method. the hydroalcoholic extract exhibited highest inhibitory act...

Metastasis by cancer cells relies upon the acquisition of the ability to evade anoikis, a cell death process elicited by detachment from extracellular matrix (ECM). The molecular mechanisms that ECM-detached cancer cells use to survive are not understood. Striking increases in reactive oxygen species (ROS) occur in ECM-detached mammary epithelial cells, threatening cell viability by inhibiting ...

this study was carried out to investigation the possibility of using triadimefon (trd) in order to decrease the adverse effects of salt stress on medicago plant. triadimefon is a member of triazol compounds which enhances stress tolerance through physiological processes. two cultivars of medicago sitiva including hamedani and yazdi were used in this study. plants were treated with 1, 2 and 4 mg...

the anti-senescence biogenic polyamines (pas) putrescine (put), spermidine (spd) and spermine (spm) are involved in plant growth processes and responses to stress. the physiological mechanism of exogenous put to affect the senescence of cut lisianthus flowers during vase life was investigated. fresh cut lisianthus flowers were treated with distilled water (control), 0.5, 1 and 2 mm put and then...

Objective(s): Tyrosinase is a key enzyme in pigment synthesis. Overproduction of melanin in parts of the skin results in hyperpigmentation diseases. This enzyme is also responsible for the enzymatic browning in fruits and vegetables. Thus, its inhibitors are of great importance in the medical, cosmetic and agricultural fields. Materials and Methods: A series of twelve kojic acid derivatives wer...

the production of reactive oxygen species (ros) in plants under low temperature stress cause damage to plants. in order to evaluate of antioxidant responses of page mandarin young trees (two years old) on different rootstocks under low temperatures, an experiment was conducted in a factorial plan based on completely randomized design. treatment of temperatures were at seven levels include 9, 6,...

Metastasis by cancer cells relies upon the acquisition of the ability to evade anoikis, a cell death process elicited by detachment from extracellular matrix (ECM). The molecular mechanisms that ECM-detached cancer cells use to survive are not understood. Striking increases in reactive oxygen species (ROS) occur in ECM-detached mammary epithelial cells, threatening cell viability by inhibiting ...