balance among different fractions of a carbon sources is of paramount importance in maintenance of very important in soil quality and environmental health. on the other hand, rapid growth of world population, degradation of agricultural soils, along with release of greenhouse gasses are some of the main challenges of the 21st century. the aim of this study was to investigate the extent of chang...

the fire as one of the ecological factor has positive or negative effects on ecosystems components. therefore, this study was evaluated the effect of fire on some soil physico-chemical properties in winter rangelands of behshahr. so that two burned sites were selected in rangelands and changed rangelands to wheat and barley with two control areas (unburned) in each of them. the soil sampling wa...

One of the ordinary methods to protect, rehabilitate, and enhance an ecosystemfunction in arid and semi-arid areas of the world is sand dune stabilization using biologicalpractices. Plantation of species on the soil plays a great role in sustainable management ofthe ecosystem. This research studies the effects of cultivation of Haloxylon ammodendronand Atriplex canescens on physical-chemical ch...

one of the ordinary methods to protect, rehabilitate, and enhance an ecosystemfunction in arid and semi-arid areas of the world is sand dune stabilization using biologicalpractices. plantation of species on the soil plays a great role in sustainable management ofthe ecosystem. this research studies the effects of cultivation of haloxylon ammodendronand atriplex canescens on physical-chemical ch...

Results The data analyzed so far revealed the presence of different pollen and fungal species at both sites. The ratio between the pollen and fungal spores was 1:5. The airborne pollen grains showed quantitative and qualitative differences between the two sites. At FD site, the major pollen grains included Phoenix dactylifera (31%), grass pollen (14%), Atriplex nummularia (12%), Amaranthus viri...

iran is a major producer of saffron in the world. about 255 tons of saffron is produced on 70 thousands hectares of land, of which 125 tons are exported. production is practiced on small holding, using traditional cultivation practices. one of the major problems associated with saffron cultivation is soil fertility depletion during the first cultivation period, the effects of which extends for ...

Calcium controls numerous cellular processes with a high degree of spatial and temporal precision. One way by which these controls are effected is through the transduction of a Ca2" signal by an interaction of the cation with Ca2"-binding proteins. Among the Ca2"-binding proteins that are presumed to function in the modulation of cellular processes are calmodulin, troponin C, myosin light chain...