نتایج جستجو برای: mn

تعداد نتایج: 39768  

Journal: :Toxicological sciences : an official journal of the Society of Toxicology 2008
Vanessa A Fitsanakis Na Zhang Joel G Anderson Keith M Erikson Malcolm J Avison John C Gore Michael Aschner

Chronic exposure to manganese (Mn) may lead to a movement disorder due to preferential Mn accumulation in the globus pallidus and other basal ganglia nuclei. Iron (Fe) deficiency also results in increased brain Mn levels, as well as dysregulation of other trace metals. The relationship between Mn and Fe transport has been attributed to the fact that both metals can be transported via the same m...

Journal: :Plant physiology 2010
Viviane Lanquar Magali Schnell Ramos Françoise Lelièvre Hélène Barbier-Brygoo Anja Krieger-Liszkay Ute Krämer Sébastien Thomine

Manganese (Mn) is an essential element, acting as cofactor in numerous enzymes. In particular, a Mn cluster is indispensable for the function of the oxygen-evolving complex of photosystem II. Metal transporters of the Natural Resistance-Associated Macrophage Protein (NRAMP) family have the ability to transport both iron and Mn. AtNRAMP3 and AtNRAMP4 are required for iron mobilization in germina...

2013
Yung Huh Parashu Kharel XINGZHONG LI Ralph Skomski David J. Sellmyer Y. Huh P. Kharel V. R. Shah X. Z. Li D. J. Sellmyer

Nanostructured Mn y Ga ribbons with varying Mn concentrations including Mn 1.2 Ga, Mn 1.4 Ga, Mn 1.6 Ga, and Mn 1.9 Ga were prepared using arc-melting and melt-spinning followed by a heat treatment. Our experimental investigation of the nanostructured ribbons shows that the material with y ¼ 1.2, 1.4, and 1.6 prefers the tetragonal L1 0 structure and that with y ¼ 1.9 prefers the D0 22 structur...

Journal: :The Science of the total environment 2001
K V Heal

Manganese (Mn) in surface waters is a micronutrient, but elevated concentrations are toxic to fish and impair drinking water quality. In Scotland, undesirable Mn concentrations (> 0.05 mg l(-1)) occur predominantly in upland freshwaters because the acidic pH and organic nature of catchment soils favour Mn mobilisation. The relationship between upland land-use in Scotland and Mn concentrations i...

2011
Ying Zhang Chao-Xia Chu Yi-Zhi Li

In the title compound, {[Mn(6)(C(8)H(4)O(4))(6)(C(4)H(9)NO)(8)]·H(2)O}(n), two of the Mn atoms are six-coordinated by six O atoms from three benzene-1,4-dicarboxyl-ate (bdc) ligands and two trans DMA (dimethyl-acetamide) mol-ecules, whereas two other Mn atoms, located on inversion centers, are both in octa-hedral coordinations by six bdc O atoms. The discrete trinuclear manganese secondary buil...

Journal: :Journal of animal science 1989
J Wong-Valle P R Henry C B Ammerman P V Rao

The relative biological availability of Mn in reagent-grade (RG) Mn sources was tested using 41 Rambouillet crossbred wether lambs in a completely randomized design. Lambs were fed a basal corn-soybean meal-cottonseed hull diet (37.6 ppm Mn, DM basis) or this basal diet supplemented with 0, 1,500, 3,000 or 4,500 ppm Mn from RG MnSO4.H20 or 3,000 ppm Mn from RG MnO, MnO2 and MnCO3. Feed intake w...

Journal: :Journal of experimental botany 2003
Luis A del Río Luisa M Sandalio Deborah A Altomare Barbara A Zilinskas

In pea (Pisum sativum L.) leaves, manganese superoxide dismutase (Mn-SOD) is mainly localized in mitochondria as well as in peroxisomes. In this work, the effect of leaf senescence on the peroxisomal and mitochondrial Mn-SOD was studied in detached leaves from pea plants which were incubated in the dark at 25 degrees C for 3-11 d. Northern blots hybridized with a cDNA encoding mitochondrial Mn-...

Journal: :iranian journal of catalysis 2015
maryam bordbar seyed mohammad vasegh somaye jafari ali yeganeh faal

undoped and mn-doped zno nanoparticles were successfully prepared by the hydrothermal method with different annealing temperature conditions. structural, chemical and optical properties of the samples were studied by x-ray diffraction (xrd), field emission scanning electron microscopy (fesem), uv-vis spectrophotometry and fourier transform infrared (ft-ir) spectroscopy. the phase purity was con...

2017
Frida B Zipkin Grace A Falciglia Pierce Kuhnell Erin N Haynes

Manganese (Mn) is an essential nutrient, but overexposure can lead to neurotoxicity. Given the essentiality of Mn in the diet, particularly during children's growth and development, it is imperative to quantify dietary Mn intake in populations that may be exposed to industrial sources of Mn. Dietary absorption of Mn is inversely associated with iron (Fe) stores, yet there is currently no food f...

Journal: :Archives of dermatology 1999
S L Harrison P G Buettner R MacLennan

OBJECTIVE To investigate the body-site distribution of melanocytic nevi (MN) with respect to habitually and intermittently sun-exposed surfaces. DESIGN Cross-sectional survey of MN prevalence. SETTING Townsville (19.16 degrees S), Queensland, Australia. PARTICIPANTS Random sample of 506 1- to 6-year-old white children who were born and raised in Townsville (response, 87.6%). MAIN OUTCOM...

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