نتایج جستجو برای: tajan river
تعداد نتایج: 83662 فیلتر نتایج به سال:
Crops growing in salt-affected soils may suffer from physiological drought stress, ion toxicity, and mineral deficiency. A pot study was conducted in 2004-2005 in the Aghala area (northern Iran) to study the effect of different salinity levels, i.e. ECe= 3 (control), 8, 12 and 16 dS m-1 on wheat grain, yield components and leaf ion uptake of four Iranian wheat genotypes, i.e. Kouhdasht, Atrak, ...
Drought stress is one of the serious problems that restricted agronomic plant production worldwide. In molecular level, the harmful effect of drought stress is mostly caused by producing of large amount of reactive oxygen species (ROS). Catalase and Metallothionein genes have a crucial role to mope the hydrogen peroxide (H2O2) resulting reducing oxidative damage. In this research the gene expre...
Effect of Shahid Rajai dam on population dynamics of the Ponticola cyrius in down stream Tajan River
To study the effect of Shahid Rajai Dam on Population dynamics of P. cyrius in downstream of the dam, during the April 2012 to March 2013, sampling was carried out monthly by electro fishing. A total of 564 specimens from the first station, 219 specimens from the second station and 263 specimens from the third station were examined and the sex ratio of male to female 1:1.42, 1:1.2 and 1:0.91 re...
introduction several hundred pesticides of different chemical compositions are currently used for agricultural and vector control purposes all over the world. because of their extensive use, they are detected in various environmental matrices, such as soil, water, and air. due to their lipophilic nature, hydrophobicity, and low chemical and biological degradation rates, organochlorine pesticide...
the life table parameters of schizaphis graminum (rondani) (hemiptera: aphididae) on four commercial cultivars of wheat (kohdasht, pastor, tajan and zagros) were determined in laboratory conditions. fertility life table were constructed using age-specific survivorship (lx) and age-specific fecundity (mx) and subsequently analyzed using jackknife method and anova. there were significant differen...
DING WANG,∗†† XIANFENG ZHANG,∗ KEXIONG WANG,∗ ZHUO WEI,∗ BERND WÜRSIG,† GILLIAN T. BRAULIK,‡ AND SUSIE ELLIS§ ∗Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China †Texas A&M University, 4700 Avenue U, Building 303, Galveston, TX 77551, U.S.A. ‡Downstream Research Group, 3950 S. Fletcher Avenue, Amelia Island, FL 32034, U.S.A. §Conservation International, 1919 M Street, S...
In Australia, Ross River virus (RRV) is predominantly identified and managed through passive health surveillance. Here, the proactive use of environmental datasets to improve community-scale public health interventions in southeastern Tasmania is explored. Known environmental drivers (temperature, rainfall, tide) of the RRV vector Aedes camptorhynchus are analysed against cumulative case record...
چکیده با توسعه شهر نشینی و دخل و تصرف غیر مجاز در حریم رودخانه ها خسارات زیادی به رودخانه و محیط زیست اطراف آن وارده می شود. در حال حاضر بر اساس آئین نامه اصلاح شده بستر و حریم رودخانه ها، حریم کمی رودخانه که بلافاصله پس از بستر قرار می گیرد از 1 تا20 متر از منتهی الیه طرفین بستر رودخانه تعیین، که مقدار دقیق آن در هر بازه از رودخانه مشخص نیست. در کشورهای دیگر روشهای متفاوتی من جمله: درصد ریسک...
Heavy metals are a major environmental problem and have caused serious concerns because of characteristics of carcinogenesis, non-degradability and biological accumulation. Major part of this material is absorbed by plants and leads to inactivation of some enzyme, decreased protein production and disrupting variety of reactions and many cellular functions and growth and development cessation. T...
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