نتایج جستجو برای: lt50
تعداد نتایج: 462 فیلتر نتایج به سال:
به منظور ارزیابی ژنوتیپهای جو از نظر تحمل یخزدگی طوقه و برخی صفات فیزیولوژیکی، 40 ژنوتیپ در دو آزمایش مورد بررسی قرار گرفتند. در آزمایش اول بذرها در داخل گلدان در قالب طرح بلوکهای کامل تصادفی با سه تکرار در گلخانه کاشته شدند. پس از عادتدهی گیاهان به سرما به مدت چهار هفته، وزن تر و خشک بافتها، درصد آب بافتها و میزان اتلاف آب نسبی اندازهگیری شد. آزمایش دوم در قالب طرح اسپلیتپلات بر پایه...
بهمنظور ارزیابی ژنتیکی 40 لاین جو از نظر مقاومت به یخزدگی براساس درصد بقای طوقه، یک آزمایش گلخانهای در قالب طرح کرتهای خرد شده با 2 تکرار اجرا شد. لاینهای جو در کرتهای فرعی و 5 سطح دما (8-، 11-، 13-، 15- و 17- درجه سانتیگراد) در کرتهای اصلی منظور شدند. افزون بر این در مورد صفات فیزیولوژیکی، که بعد از عادتدهی و قبل از اعمال دماهای یخزدگی اندازهگیری شدند، تجزیه دادهها بر مبنای طرح بلو...
In order to evaluate cold tolerance of twenty barley genotypes under field conditions, an experiment was carried out in a randomized complete block design at 3 sowing dates of October 5, November 5, and December 5 in Saatlu Agricultural Research Station, West Azarbaijan, Iran, during 2010-11 seasons. Also, another experiment was conducted on the same genotypes based on a completely randomized d...
Wireworms are the soil inhabiting larvae of click beetles and can cause severe damage to arable crops such as potatoes (Solanum tuberosum, L.). Several strains of the entomopathogenic fungus Metarhizium brunneum (Petch) are pathogenic to wireworms. In this study, three European strains of M. brunneum were tested in the laboratory against the most damaging wireworm species in Europe, Agriotes li...
Candidate OSPAR/ICES recommended biomarkers at the level of the individual in Mytilus edulis for determination of good environmental status for MSFD were evaluated against contaminant levels at sites around Ireland. The sites chosen ranged from moderate to low pollution levels, but the actual ranking of the sites varied according to the contaminant levels present. At the most contaminated site,...
The red palm weevil, Rhynchophorus ferrugineus Olivier (Coleoptera: Curculionidae) is a serious pest of the palm tree in tropical regions of the world. One strain of Metarhizium sp. ZJ-1, isolated from Chinese soils, was evaluated for growth characteristics, and screened for its virulence to R. ferrugineus larvae in laboratory conditions. An approximately 685-bp fragment was amplified by ITS (I...
background : according to the national strategy plan on monitoring of insecticides resistance, this study was carried out to determine the base line susceptibility of the culicidae mosquitoes to the who-recommended insecticides in an endemic focus of malaria in southeastern iran. methods : larval collection was carried out by dipping method and adult collection occurred by suction tube from jan...
The susceptibility of Culex quinquefasciatus to chemical insecticides in two field sites in Kuala Lumpur was evaluated using the WHO standard susceptibility test. Less then 7days old female mosquitos, reared from wild caught females were exposed to discriminating dosages of insecticides at recommended exposure periods. The larval bioassay were conducted using the multiple concentrations and the...
The resistance/susceptible status of Aedes aegypti (field strain) from slum area of Misri Shah Lahore, Pakistan was determined during May 2009 to January 2011. Two insecticides i.e. deltamethrin 1.5% EC and cypermethrin 10% EC which were sprayed in various localities of Lahore from the last ten years were used to evaluate resistance/susceptible status of field collected adult females of Aedes a...
Two freshwater fishes, Rasbora sumatrana (Cyprinidae) and Poecilia reticulata (guppy) (Poeciliidae) were exposed for a four-day period in the laboratory condition to a range of copper (Cu) and cadmium (Cd) concentrations. Mortality was assessed and median lethal concentrations (LC50) were calculated. LC50 increased with decrease in mean exposure times for both metals. For R. sumatrana, LC50s fo...
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