Plant stoichiometry in relation to environmental factors has recently received increasing attention. However, regulations and variations of plant elements in different environments are not well understood. We investigated homeostasis and variation of macroelements (C, N, P, K, Ca, Mg, and S), essential microelements (Fe, Mn, and Zn) and non-essential elements (Al) in Quercus variabilis leaves a...

concentration of as in the muscle and liver of aspius vorax, cyprinion macrostomus, barbus luteus in karoon river and liza klunzingeri and liza macrolepis from hendijan port, persian gulf, were investigated in 2011. in this study, 30 samples of fish were collected in winter. metals were extracted from the tissues using wet the digestion method and concentration of the heavy metals were measured...

Models that describe the trace element status formation in the human organism are essential for a correction of micromineral (trace elements) deficiency. A direct trace element retention assessment in the body is difficult due to the many internal mechanisms. The trace element retention is determined by the amount and the ratio of incoming and excreted substance. So, the concentration of trace ...

selenium is a non metallic chemical element that affects plant growth and development and but it can due to the presence of antioxidant defense system as a matter of basic human and animal health has been identified. an experiment was conducted to study the effect of se on physiological characteristics and yield of brussels sprouts (brassica oleracea var. gemmifera) with six levels of se (0, 2,...

Atomic Absorption Spectrometry (AAS) is a technique for measuring quantities of chemical elements present in environmental samples by measuring the absorbed radiation by the chemical element of interest. This is done by reading the spectra produced when the sample is excited by radiation. The atoms absorb ultraviolet or visible light and make transitions to higher energy levels. Atomic absorpti...

BACKGROUND AND OBJECTIVES: Urban farming makes a substantial influence on the household economy of the urban poor especially in developing countries. Urban soil the hot spot of urban farming is a natural sink for contaminants especially the trace elements derived mainly from anthropogenic activities. This study’s aim was to quantify the concentrations of selected trace elements...

Humanity already possesses the fundamental scientific, technical, and industrial know-how to solve the carbon and climate problem for the next half-century. A portfolio of technologies now exists to meet the world's energy needs over the next 50 years and limit atmospheric CO2 to a trajectory that avoids a doubling of the preindustrial concentration. Every element in this portfolio has passed b...

The present model discusses the drug distribution in the layers of human dermal parts. We have considered tissue absorption rate of drug is decreasing function of drug concentration, also considered linear shape functions for approximating element wise approximate solution by Finite Element Method (FEM).In this method each region is referred to as an element and the process of subdividing a dom...

introduction thermodynamically, the surface waters in mountain environments are unstable and their chemical composition is a reflection of water-rock interactions. few studies have also been undertaken on the geochemistry of the surface waters in mountain environments. hence, this paper deals with the source of elements as well as the chemistry of the stream which drains from the caldera of bid...