In this research work, the dissolution of chalcopyrite was investigated under atmospheric pressure, with sulfate media at low temperatures, in 30°C to 50°C. In the galvanic interaction between chalcopyrite and pyrite, pyrite is used as a leaching catalyst. Effects of different parameters such as temperature, stirring speed, pyrite to chalcopyrite ratio, particle size, and solution potential wer...

Chickpea (Cicer arietinum L.) is an important food and rotation crop in many parts of the world. Cold (freezing and chilling temperatures) and Ascochyta blight (Didymella rabiei) are the major constraints in chickpea production. The effects of temperature stresses on chickpea susceptibility and pathogen aggressiveness are not well documented in the Cicer-Didymella pathosystem. Two experiments w...

this study investigates monthly and seasonal variations of carbon emission from the soil at different grazing intensities. three areas of exclosure, low and high grazing intensities were selected in ghoosheh region of semnan province. carbon emission was measured monthly, in each treatment applying alkali traps (csc) during a year. emission and grazing data were analyzed, using a factorial expe...

The fruit fly Drosophila melanogaster displays an ovarian diapause that is regulated by photoperiod. Newly eclosed female flies (Canton-S wild type) exposed to short days (less than 14 hr of light per day) at 12 degrees C (or 10 degrees C) enter a fairly shallow reproductive diapause. Females exposed to long days (16 hr of light per day) at the same low temperature undergo ovarian maturation. T...

Red and far red light distinctly influence the initial phytochrome-mediated phase of cold acclimation in red-osier dogwood (Cornus stolonifera). Under controlled conditions, short days and end-of-day far red light exposure after long days promote growth cessation, cold acclimation, and subsequent cold hardening of dogwood stems in response to low temperature. Nuclear magnetic resonance absorpti...

predatory damsel bug, nabis pseudoferus remane has a high density in the alfalfa fields and feeds on different types of prey. in this study, biological properties and life table statistics of n. pseudoferus by feeding on melon aphids have been determined under controlled conditions (at 25±1˚c, 60±10% relative humidity and under a photoperiod of 16h light/ 8h dark). data analysis carried out bas...

Air temperature and light conditions are important factors not only to produce high-quality seedlings but also promote energy efficiency in a plant factory with artificial lighting. In this study, we conducted two experiments order investigate the favorable of air temperature, intensity photoperiod for production cucumber scions rootstocks Cucumber were cultivated combined treatments: combinati...

For controlled environment agriculture (CEA) related facility planning and design, weather information for the specific location are required for the estimation of heating/cooling loads and design of environmental control components and systems. Summer/Winter design temperature and degree day were the traditional methods used by the engineers to estimate the annual cooling/heating load. Weather...

to cope with cold stress, winter cereals regulate their development through adaptive mechanisms such as vernalization requirement. eight wheat and four barley cultivars were planted to determine the relationship between vernalization fulfilment and expression of cold tolerance under both field and controlled conditions. cultivars were planted at maragheh and karaj agricultural research stations...