Ground water sources in some part of Ethiopia contain nitrate level beyond the permissible limit which can cause public health problems. Hence, the concentration of nitrate in drinking water should be removed to prevent ...

The purpose of this thesis was to study phonon assisted and zero phonon radiative lifetimes of electron-hole pair which are excited and recombine inside nc-Si, on the basis of more realistic assumption of finite potential ...

Background: Zinc is important for normal human physiology and plays great role in cell growth, reproduction and immune system from inside utero until puberty. The element is especially needed dming pregnancy for fetal ...

Zooplankton community grazing rate as % of algae grazed per day was determined in five lakes and one public water-supply reservoir from March, 1993 to October, 1993_ Physical and chemical measurements (Temperature, Secchi ...

The species compositilln and seasonal dynamics (abundance) of zooplankton in Lake Ziway (a tropical lake) was studied from f1arch 19,H to f1arc, h 19UB. Bimonthly vertical haul zooplankton samples were taken from 3 ...