skin aging is a continuous process that exhibits fine and deep wrinkles, thin and transparent skin, loss of underlying fat, dry skin and itch, following decreased collagen and elastin  synthesis. both extrinsic and intrinsic agents are considered in the pathogenesis on skin aging. extrinsic factors such as sun exposure, windy and dry weather, nutrition, and lifestyle may induce premature aging,...

We consider approximate Bayesian analysis for the poly-Weibull model, which arises in competitive risk scenarios when the risks are independent and there is no knowledge about which factor was responsible for failure. Real and generated datasets illustrate the methodology, which is based on Laplace's method for integrals. is grateful to the Brazilian institutions UFSCar and CNPq for their nanci...

background: radiotherapy treatment planning requires different dosimetric quantities as input in order to calculate a desired dose distribution. this study has been focused to evaluate the depth dose characteristics of superficial x-rays being used for radiotherapy treatment. materials and methods: computerized 3-d water phantom of multi-data system was used. the measurements were made through ...

objective: periapical granulomas (pgs) and radicular cysts (rcs), as the most common odontogenic lesions have yet unclear pathogenesis. this study was aimed to compare pcna and ki-67 expression in pgs and rcs and evaluate their possible relationship with two lesions. methods: in this cross-sectional descriptive study, twenty pgs and twenty rcs were evaluated immunohistochemically using an anti-...

reliable estimates of runoff are required as a part of the information sets that help watershed managers make informed decisions on water resources planning and management. this study was carried out in shafaroud watershed located in the north of iran. in order to achieve the best runoff simulation in the study area, first rainfall data of four stations during 1998 to 2011 were collected and co...

objective(s):several investigations have revealed that caspase-14 is responsible for the epidermal differentiation and cornification, as well as the regulation of moisturizing effect. however, the precise regulation mechanism is still not clear. this study was aimed to investigate the expression of caspase-14 in filaggrin-deficient normal human epidermal keratinocytes (nheks) and to explore the...

background and objective: production of polyhydroxyalkanoate copolyesters consisting of 3-hydroxybutyrate and 3-hydroxyvalerate units was for the first time studied using the production strain hydrogenophaga pseudoflava based on sustainable raw materials. this strategy provides for increased cost efficiency in pha production and in enhanced material quality. material and methods: as a particula...

in the present study, 2, 4-dichlorophenoxyacetic acid (2, 4-d) was assessed individually for its effectiveness to induce somatic embryogenesis in tea (camellia sinenesis l.). embryonic axes and cotyledons explants were dissected from the seeds. explants were cultured on murashige and skoog (ms) medium containing 0, 1 and 5 mm 2, 4-d alone for embryonic axes and 0, 1 and 5 mm 2, 4-d along with 0...

the present study carried out an in vitro experiment on effects of salinity and temperature on acartia tonsa life cycle from caspian sea. during the experiment, temperature and salinity ranged 25, 27, 29 ± 1 °c and 12‰ and 17‰, respectively within a period of 60 days. spawning rate was measured using mesh size of 100 µ planktonic net from surface to 10 m depth. early results show that nauplii a...

this research was conducted to evaluate alteration of growth performance, nutrition, carcass and some serum biochemical parameters of common carp fed the diets supplemented by different levels of meal and alcoholic extract of alfalfa (medicago sativa). in this research, 300 fish (mean weight: 20.4 ± 0.19 g and mean length: 11.78 ± 0.64 cm) were fed by nine nutritional diets for 8 weeks. nutriti...