K Haghbeen
National Institute of Genetic Engineering and Biotechnology, Tehran, Iran
[ 1 ] - Advanced oxidation processes against alkyl phenols in groundwater samples
Spectrophotometric examinations showed the presence of phenolic compounds in the organic residue collected from four groundwater resources located in vicinity of an oil refinery at the outskirt of Tehran. The average concentration of total phenolic compounds was about 0.38 mg.L-1 in these samples using Folin-Ciocalteu method. GC-Mass analysis disclosed that alkylphenols were the major phenolic ...
[ 2 ] - A Synthetic Approach for Evaluation of Cytosinediazonium Susceptibility
Reaction of a nucleobase with nitrosonium ion leads to its diazotization. Due to the instability,the nucleobase-diazonium assumingly falls in dediazotization and successive ring openingreactions. The resulting intermediate of the ring opening reaction is able to covalently cross-linkthe opposite strands of DNA. To examine this assumption for cytosine, some 4-amino-5-cyanopyrimidines were synthe...
[ 3 ] - Nanoporous Xerogel for Adsorption of Pb2+ and Cd2+
Classical xerogels are robust, inexpensive and nontoxic materials with low-ordered nanoporous structures. In water streams where the pH is higher than the Point of Zero Charge, the surface of classical xerogels such as tetraethoxy orthosilan (TEOS) xerogel is negatively charged. It was assumed that a xerogel can work as a strong adsorbent for metal ions without further modification. Therefore, ...
[ 4 ] - Enzymatic detoxification of Don in transgenic plants via expression of Fusarium graminearum Tri101 gene
Fusarium graminearum is causal agent of economically catastrophic disease of cereal Fusarium Head Blight (FHB) around the world. In addition to causing a loss of yield, this fungus causes serious threats to humans and animals due to the contamination of grain with the trichothecene mycotoxin. TRI101 gene, a Fusarium spp. gene, encodes an enzyme that transfers an acetyl group to the C3 hydroxyl ...
[ 5 ] - اثر تنش کم آبی بر برخی خصوصیات فیزیولوژیکی و میزان اسمولیتهای قند و پرولین در طالبی سمسوری ورامین
Abstract In order to study the effect of water deficit stress on some physiological characteristics including leaf water osmotic and turgor potentials and osmolytes including sugars, proline and invertase activity of Persian melon (Cucumis melo Group. cantaloupensis cv. samsoury), an experiment was conducted in complete randomized design. Treatments including three irrigation levels (start of ...
[ 6 ] - ارزیابی قدرت جذب اگزروژل تترااتوکسی‌سیلان برای کاتیون‌های Cr3+ و Cu2+
.دراین تحقیق توانایی اگزروژل تترااتوکسی سیلان(TEOS) برای جذب دو یون فلزی (+Cr3+,Cu2) ازمحلول های آبی مورد مطالعه قرار گرفت و تاثیر عوامل مختلف مانند زمان، pH، مقدار جاذب و دما روی جذب این فلزات بررسی گردید. همچنین رفتار جذب این دو کاتیون توسط مدل های مختلف ایزوترم مورد ارزیابی قرارگرفت. نتایج جذب بهترین تطابق را با مدل ایزوترم دوبینین- راداشکویچ داشتند که موید قدرت جذب بالاتر +Cr3 با بیشینه ظر...
[ 7 ] - حذف استرانسیوم از محلول های آبی به وسیله ی اگزروژل به دست آمده از تترا اتیل اورتو سیلیکات: بررسی های سینتیکی و ترمودینامیکی
در این پژوهش کاتیون استرانسیوم(II) توسط اگزروژل به دست آمده از تترااتیل اورتو سیلیکات از محلول آبی در یک سامانه ناپیوسته حذف شد. مقدارهای جذب با تغییر پارامترهای زمان، pHمحلول، دما، مقدار جاذب و مقدار اولیه یون فلزی بررسی شد. هم‌دماهای جذبی لانگمویر، فروندلیچ، تمپکین و دوبینین ـ رادشکویچ بررسی شد. مطالعه ها نشان دادند که داده ه...
[ 8 ] - Enhancement of Shikalkin Production in Arnebia euchroma Callus by a Fungal Elicitor, Rhizoctonia solani
Background: There is a growing demand for mass production of shikalkin (a natural pigment consisted of shikonin and alkannin) due to its increasing applications in cosmetics, pharmaceutical and nutrition industries. The root of Iranian Arnebia euchroma produces shikalkin. The promising capability of this plant for shikalkin production has already been demonstrated in cell culture studies. Obje...
نویسندگان همکار