نتایج جستجو برای: fe mn

تعداد نتایج: 109201  

ژورنال: :دانش آب و خاک 0
لقمان رحیمی دانشگاه پیام نور تهران ناصر علی¬اصغرزاد دانشگاه تبریز شاهین اوستان دانشگاه تبریز داود فرجزاده دانشگاه تربیت معلم آذربایجان

در این آزمایش 14 سویه ازتوباکتر کروکوکوم جداسازی شده از مزارع گندم اطراف تبریز از نظر توان تولید سیدروفور در شرایط درون شیشه­ای با استفاده از محیط کشت جامد حاوی کروم­آزرول-اس مورد ارزیابی قرار گرفتند که برخی از سویه­های مورد بررسی از توان تولید سیدروفور نسبتاً بالائی برخوردار بودند. سپس با استفاده از خاک سترون در یک آزمایش گلخانه­ای با گیاه گندم بهاره رقم فلات در قالب طرح کاملاً تصادفی با 16 تیما...

ژورنال: علمی شیلات ایران 2016
زرشناس, رامین, فرشچی, پروین, نجف پور, شعبان, نصر اله زاده ساروی, حسن,

This study was conducted to determine some heavy metals (Fe, Mg, Cr, Ni) of surface sediment in the southern Caspian Sea during two seasons (Summer and Winter) in 2014-2015. 36 surface sediments samples (with triplicate) were collected at two stations (Tonekabon and Bandar Amirabad). All samples were analyzed using sequential extraction to indicate natural and anthropogenic sources. The results...

Journal: :Toxicological sciences : an official journal of the Society of Toxicology 2006
Stephanie J Garcia Kristin Gellein Tore Syversen Michael Aschner

Manganese (Mn) neurotoxicity in adults can result in psychological and neurological disturbances similar to Parkinson's disease, including extrapyramidal motor system defects and altered behaviors. However, virtually nothing is known regarding excess Mn accumulation during central nervous system development. Developing rats were exposed to a diet high in Mn via maternal milk during lactation (P...

Journal: :Toxicology and applied pharmacology 2008
Xueqian Wang David S Miller Wei Zheng

Confocal microscopy was used to investigate the effects of manganese (Mn) and iron (Fe) exposure on the subcellular distribution of metal transporting proteins, i.e., divalent metal transporter 1 (DMT1), metal transporter protein 1 (MTP1), and transferrin receptor (TfR), in the rat intact choroid plexus which comprises the blood-cerebrospinal fluid barrier. In control tissue, DMT1 was concentra...

2009
Catherine Au Alexandre Benedetto Joel Anderson Arnaud Labrousse Keith Erikson Jonathan J. Ewbank Michael Aschner

Manganese (Mn) is an essential metal that can exert toxic effects at high concentrations, eventually leading to Parkinsonism. A major transporter of Mn in mammals is the divalent-metal transporter (DMT1). We characterize here DMT1-like proteins in the nematode C. elegans, which regulate and are regulated by Mn and iron (Fe) content. We identified three new DMT1-like genes in C. elegans: smf-1, ...

Journal: :international journal of environmental research 0
e.o. okuku kenya marine and fisheries research institute, p.o. box 81651, mombasa, kenya, soil and water management division, faculty of bioscience engineering, katholieke universiteit leuven, kasteelpark arenberg 20, b-3001 heverlee, belgium h.k. peter tanzania fisheries research institute, p.o. box 9750, dar es salaam, tanzania

the study aimed to come up with a list of specific macroalgae species, which could be used to biomonitor specific metal elements in the coastal waters of east africa. water extraction, edta, aqua regia extraction and optimized bcr 3-step sequential extracts were used to mimic bioavailable metals under various environmental conditions. the results indicated that ulva lactuca could be used as a b...

Hossein Vaezzade, Maryam Rafati, Musa Zarei Dangesaraki, Saeed Zahedi,

Background: Iron, manganese, and aluminum are three abundant metals on earth and their concentrations have increased in aquatic environments as a result of natural and industrial activities. This study was undertaken to report the median acute toxicity (LC50) and accumulation of the sub-lethal concentration (10% 96-h LC50) of iron (Fe), manganese (Mn) and aluminum (Al) in kutum (Rutilus kutum) ...

2010
Madison C. Barkley Hexiong Yang Robert T. Downs

The crystal structure of kôzulite, an Mn-rich alkali amphibole with the ideal formula NaNa(2)[Mn(4) (2+)(Fe(3+),Al)]Si(8)O(22)(OH)(2), tris-odium tetra-manganese iron/aluminium octa-silicate dihydroxide, was refined from a natural specimen with composition (K(0.20)Na(0.80))(Na(1.60)Ca(0.18)Mn(2+) (0.22))(Mn(2+) (2.14)Mn(3+) (0.25)Mg(2.20)Fe(3+) (0.27)Al(0.14))(Si(7.92)Al(0.06)Ti(0.02))O(22)[(OH...

Journal: :international journal of environmental research 2015
a. kumar j. ahirwal s. k. maiti r. das

rapid expansion of the industrial sector adds more effluent into the agricultural land and in the vicinity of industry, which possesses the major threat of land contamination and environmental degradation. the present study was conducted to determine toxic metal concentration in fly ash and metal accumulation potential of the saccharum munja and cynodon dactylon, the two main grass species grow...

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