Stable isotope studies on stable isotope ratios of hydrogen and oxygen in water within plants provide new information on water sources and water use patterns under natural conditions. In this study, the sources of water uptake for two typical xerophytic shrubs, Caragana korshinskii and Artemisia ordosica, were determined at four different-aged revegetated sites (1956, 1964, 1981, and 1987) in t...

Süt, yaşamın her evresinde önemli bir besin kaynağıdır. Sütün bileşimi, kalıtımsal, fizyolojik ve çevresel faktörler ile yetiştirme koşullarına bağlı olarak büyük ölçüde değişir. Kaliteli süt üretimi, ekonomik anlamda sağlık açısından çok önemlidir. Günümüzde endüstrideki hızlı gelişmeye ortaya çıkan çevre kirliliğinin olumsuz etkilerinden birisi de insan hayvanların ağır metallere maruz kalmas...

Soil samples were collected from Changwon and Masan Cities, Korea, and analyzed for polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDDs/DFs). Nearly all tetra- through octachlorinated PCDDs/DFs including the 17 2,3,7,8-substituted PCDDs/DFs were detected in all samples. Total concentrations of PCDDs/DFs and of 2,3,7,8-tetrachlorinated dibenzo-p-dioxin (TeCDD) equivalents (TEGs) in soils ...

background: vahlkampfiids contains wide variety of genuses with some known as human pathogens such as naegleria , vahlkampfia and non pathogens such as willaertia. since there was no evidence of presence of vahlkampfiids in different sources in iran, we have analyzed soil samples to clarify the presence of these amebas. methods: seven soil samples collected in tehran were analyzed to clarify th...

abstract in order to determine the time of maximum demand of winter wheat (triticum aestivum l.) to phosphorous fertilizers and p and zinc (zn) distribution in different parts of wheat at various growth stages and study their relation to the contents of these elements in soil p and zn under field conditions, samples were collected from different parts of the plants at seven growth stages (i.e.,...

the main source of heavy metals in soil is the use of urban and industrial waste water, synthetic phosphate fertilizers, sludge from sewage treatment plants. most heavy metals accumulate in the top soil and in the long term, their increased concentration in the soil and accumulation in the plants. the quantity or level of absorption in plants, depends not only on the concentration levels of the...

Introduction Natural and artificial radionuclides are the main sources of human radiation exposure. These radionuclides, which are present in the environment, can enter the food chain. Rice is one of the most important food components in Iran. Radionuclides by transferring from soil to rice and entering the human body can affect human health. Materials and Methods Fourteen samples of different ...