using productivity index for investigating a firms’ performance makes it possible to evaluate efficiency of the production system and cost at the same time. in this study the total factor productivity (tfp) of several sugar cane varieties in imam khomeini cultivation and processing center in khuzestan province is compared. two hundred and forty eight farms are categorized on the basis of variet...

it is dawn clear that empowered employees in public sector perform a critical role in their organizational service quality. by the same token, currently competitive advantages stem from employees’ high self-confidence and their commitment toward the goals rather than application of high technologies. this study summarizes twenty influencing factors on employees empowerment including information...

the aim of this study was to determine the extent of metal pollutions and the identification of their major sources in the vicinity of the sangan iron mine occurring in ne iran. soil samples were collected from the vicinity of the mine site and analyzed for heavy metals. in addition, the chemical speciation of these metals was investigated by means of the sequential extraction procedure. the st...

The ecological quality status (EcoQ) of intertidal mudflats constrained by Pacific oyster farming was assessed by single (H', AMBI, BENTIX and BOPA) and multimetric (M-AMBI and average score) index approaches in the Pertuis Charentais (SW France). Fifteen sampling stations were monitored seasonally for sedimentological features and macrozoobenthos in 2004. Sediments affected by oyster biodeposi...

Global water shortage is caused not just by the physical scarcity of water, but also gradual deterioration quality resources such as lakes, streams and rivers with heavy metals. This present study evaluated status Mn, Fe, Cr, Cu, Ni, As, Zn, Pb Cd in sediments from lower Orange River Inductively Coupled Plasma Atomic Emission Spectrometry technique collecting a total eleven samples, each weighi...

Understanding the dynamics and spatial variation of subaquatic sediment contamination in Santos Estuarine System has been interest to scientific community environmental managers; hazardous contaminant compounds, either individually or synergistically, can affect health local community. In present study, water column salinity geochemical properties (calcium organic matter content, grain size) we...

Diabetic retinopathy is a leading cause of reduced visual acuity and acquired blindness. Available treatments are not completely effective. We analyzed the effect of environmental enrichment on retinal damage induced by experimental diabetes in adult Wistar rats. Diabetes was induced by an intraperitoneal injection of streptozotocin. Three days after vehicle or streptozotocin injection, animals...