6 results match your criteria proceed mma

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Middle Meningeal Artery Embolization of a Pediatric Patient With Progressive Chronic Subdural Hematoma.

Oper Neurosurg (Hagerstown) 2021 May 6. Epub 2021 May 6.

Department of Neurosurgery, Icahn School of Medicine at Mount Sinai, New York, New York, USA.

Background And Importance: Evidence suggests middle meningeal artery (MMA) embolization benefits adult patients with chronic subdural hematoma (CSDH) at high risk for recurrence or hemorrhagic complications. Yet, there has not been any report discussing MMA embolization in the pediatric population. Thus, we present a case of an infant with CSDH successfully managed with MMA embolization without surgical management. Read More

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Aminomethylated Calix[4]resorcinarenes as Modifying Agents for Glycidyl Methacrylate (GMA) Rigid Copolymers Surface.

Polymers (Basel) 2019 Jul 4;11(7). Epub 2019 Jul 4.

Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia-Sede Bogotá, Carrera 30 No. 45-03, 7122 Carrera, Colombia.

Functionalization of tetrapropylcalix[4]resorcinarene, tetrapentylcalix[4]resorcinarene, tetranonylcalix[4]resorcinarene, and tetra-(4-hydroxyphenyl)calix[4]resorcinarene by means of aminomethylation reactions with the amino acids β-alanine and l-proline in the presence of aqueous formaldehyde was carried out. When β-alanine was used, the reaction products were tetrabenzoxazines. The reaction with tetra-(4-hydroxyphenyl)calix[4]resorcinarene did not proceed under the experimental conditions; therefore, l-proline was used, and the corresponding tetra-Mannich base was regio- and diasteroselectively formed. Read More

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Determination of arsenic and antimony in seawater by voltammetric and chronopotentiometric stripping using a vibrated gold microwire electrode.

Anal Chim Acta 2012 Oct 19;746:53-62. Epub 2012 Aug 19.

School of Environmental Sciences, University of Liverpool, 4 Brownlow Street, L69 3GP Liverpool, United Kingdom.

The oxidation potentials of As(0)/As(III) and Sb(0)/Sb(III) on the gold electrode are very close to each other due to their similar chemistry. Arsenic concentration in seawater is low (10-20 nM), Sb occurring at ~0.1 time that of As. Read More

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October 2012

Theoretical study of the oxidation reactions of methylacrylic acid and methyl methacrylate by triplet O2.

J Phys Chem A 2007 Feb;111(5):747-52

Institute of Theoretical Chemistry, Shandong University, Jinan 250100, P. R. China.

The oxidations of organic compounds and polymers by triplet O2 were called "dark oxidation" or "auto-oxidation", in contrast to their "photo-oxidation" by singlet O2. To study the relevant dark oxidation mechanism we take methylacrylic acid (MAA) and methyl methacrylate (MMA) as prototypes to study their reactions with triplet O2 by performing density functional theory calculations. Two reaction channels, the C-H bond oxidation and C=C bond oxidation, have been characterized in detail. Read More

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February 2007

A new metabolic pathway of arsenite: arsenic-glutathione complexes are substrates for human arsenic methyltransferase Cyt19.

Arch Toxicol 2005 Apr 4;79(4):183-91. Epub 2004 Nov 4.

Environmental Health Sciences Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Ibaraki , Japan.

The metabolism of arsenic is generally accepted to proceed by repetitive reduction and oxidative methylation; the latter is mediated by arsenic methyltransferase (Cyt19). In human urine, the major metabolites of inorganic arsenicals such as arsenite (iAsIII) and arsenate (iAsV) are monomethylarsonic acid (MMA(V)) and dimethylarsinic acid (DMA(V)). On the other hand, in rat bile, the major metabolites of iAsIII have been reported to be arsenic-glutathione (As-GSH) complexes. Read More

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Formation of beta-methylmalate and its conversion to citramalate in Rhodospirillum rubrum.

J Biochem 1975 Oct;78(4):763-72

Using a cell-free extract of Rhodospirillum rubrum, studies were made of the condensation reaction between propionyl-CoA and glyoxylate. When [14C]propionate was incubated with the extract in the presence of glyoxylate, ATP, CoA, Mg2+, and Mn2+, radioactivity was incorporated into several compounds. Two of the main products were characterized as citramalate (CMA) and erythro-beta-methylmalate (erythro-MMA) on the basis of their behavior compared with authentic samples of CMA and erythro-MMA in the following three analyses: (i) paper chromatography using two solvent systems, (ii) radio-gas chromatography on their methyl esters, and (iii) chemical conversion to readily crystallizable derivatives, that is, citramalyl chloralide for CMA, and thymine for MMA. Read More

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October 1975
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