Changes in the concentrations of selected trophic state parameters in Lake Griffi n were examined over a 22-year period. Parameters included chlorophyll-a, total nitrogen and total phosphorus. Additional information was obtained for phytoplankton composition and nutrient limitation status of phytoplankton growth over a shorter period of time, from 2000 to 2002. The central goal of the study was...

A greenhouse experiment on a silt loam surface soil (Typic Hapludult) was done to investigate effects of P and S on yield, quality aspects and sugar reserves in the tropical forage legume Clitoria ternatea L. Four levels of P and two N treatments (NH4N03 vs symbiotic) were arranged in a factorial design with four replications. After the first cutting two levels of S were imposed on this design....

1. Total-body neutron-activation analysis in vivo was carried out in 11 hypertensive subjects to measure simultaneously the total body content of sodium, chlorine, calcium, phosphorus and nitrogen. 2. There was a highly significant correlation between total body sodium measured by activation analysis and total exchangeable sodium measured by a standard isotope-dilution technique (r = 0.92, P le...

When lactating animals are treated with thyroxine, milk yield is almost invariably markedly stimulated (Graham, 1934a, b; Jack & Bechdel, 1935; Folley & White, 1936; Herman, Graham & Turner, 1938; Smith & Dastur, 1940; Owen, 1948a; Chanda & Owen, 1951). Usually the yield of fat is stimulated to a greater extent than that of the milk so that an increase in fat percentage results. This latter eff...

A phosphorus allotrope that has not been observed so far, ring-shaped phosphorus consisting of alternate P8 and P2 structural units, has been assembled inside multi-walled carbon nanotube nanoreactors with inner diameters of 5-8 nm by a chemical vapor transport and reaction of red phosphorus at 500 °C. The ring-shaped nanostructures with surrounding graphene walls are stable under ambient condi...

Water extractable nitrate nitrogen, phosphate phosphorus and iron(II) in relation to the total amount of these essential elements were analyzed in fruits and seeds of medicinal plants. Water extraction was chosen to simulate in the analytical procedure the way plant samples are prepared and used by people. The total amounts of nitrogen, phosphorus and phosphate phosphorus were determined in the...

Sediment from two Georgia Piedmont impoundments and soil from the Georgia Piedmont Bt horizon were incubated with an easily consumable organic carbon substrate in an anaerobic environment to observe iron reduction and phosphorus release. 97% of porewater iron in the Bt horizon soil, 96% of porewater iron in Lake Lanier sediments, and 93% of porewater iron in Lake Oglethorpe sediments was reduce...

Serum biochemical parameters are important aspects in the management of endangered species such as Caspiomyzon wagneri. The objective of this survey was to determine some serum ionic and metabolic parameters and those relationships in 22 migratory population of Caspian lamprey in shirood river (a river located at the south of Caspian sea). There was no significant (P<0.05) difference between le...