the study of spatial and temporal changes in climate parameters, is one the most important issues in the world's climate research. study of changes in cloud cover as one of the most important climate parameters is important, because clouds are in top of hydrologic cycle and changes in them make changes in spatial and temporal variations in other climate parameters. in this study, the spati...

this research was aimed to investgate the effect of light quality on micropropagation of pear rootstock oh×f333. first, single nodes explants were cultured in modified ql medium containing ba at four levels (0, 0.5, 1, and 2 mg/l-1) and iaa at three levels (0, 0.1, and 1 mg/l-1) and were evaluated for shoot proliferation. then, plantlets subcultured in modified ql medium containing 1 mg/l-1 ba ...

if we study the contemporary palestinian poetry of the last century we will find that the theme of nationhood and motherland dominates it. one reason is the fact that during this period palestine has been through such events that has ignited a sense of patriotism, a wish to defend of the motherland and the arabic origin of the palestinian people. since the balfour declaration, the endeavour to ...

to determine the effect of farm slopes on yield and some agronomic traits of wheat under different fertilizer treatments, an experiment was performed as split plot based on randomized complete block design with three replications in piranshahr in 2011-2012. treatments consisted of farm slope at four levels: (zero, 3, 6 and 10 %) as the main plots and combination of different fertilizer at five ...

introduction climate change happens due to abnormal changes of climate within the earth’s atmosphere and their consequences. one of the most significant effects of climate change is the irreversible damage to some floral species and forest ecosystems. tree species reflect the impact of climate changes on their ring width. generally, tree rings vary in size each year depending upon the environme...

this study evaluated the irrigation water management and different amounts of boron fertilizer affacts on yield and and water use efficiency of sugar beet. the two-factor factorial design in randomized complete block with three replications of irrigation and different levels of boron fertilizer for three years (2000-02) was designed in qazvin. the main four irrigation treatments were t1, t2, t3...

iran has a complex topography and it consists of rugged, mountainous rims surrounding high interior basins. because of this condition, in some cases the nwp output has a significant error from mesoscale variations induced by the diverse topography.  iran, covering an area of about 1,648,000 km2, is located in the southwest of asia approximately between 25° and 40° n and 44° and 64° e. this is p...

chromium (cr) is one of the elements presents in crust of the earth. due to its toxicity, chromium is considered as water contaminant that may disturb metabolic activity. in the present study, adsorption of dissolved chromium (vi) onto elaeagnus angustifolia fruit charcoal, jujube fruit charcoal and the standard granular activated carbon (gac) has been investigated and compared. the effect of c...

in this study the effects of the most popular anaesthetics including: ms222, clove oil (eugenia caryophyllata) and 2-phenoxyethanol, on some haematological and serum enzymes of cyprinus carpio were investigated. firstly the effective dose of each anaesthetics (3 minutes for anesthesia and 5 minutes for recovery ) and lc50 of them were calculated in c. carpio. fish were anaesthetized with the ef...

in order to evaluation of the relationship among protein markers and traits such as proline content variation, quantum efficiency of photosystem ii and field viability index, 20 genotypes of barely were studied in a randomized complete block design in the greenhouse experiment. plants were transferred to springhouse at the four leaf stage and were located at the temperature of 4°c for three wee...