Results 61 to 70 of about 2,508,935 (158)

The Reaction of Methylmalonic Acid with Aldehydes

Nippon kagaku zassi, 1962
π-プチルアルデヒド,π-ヘプタアルデヒド,およびρ-ニトロベンズァルデヒドをメチルマロン酸とピリジンまたはトリェチルアミンの存在で反応させた。反応は脱炭酸のみをともない,α-メチル-β-オキシカルボン酸が生成された。このオキセ酸を85%硫酸中でラクトン化させてα-メチル-γ-カプロラクトンおよび-γ-η-ノナラクトンが得られた。
openaire   +2 more sources

A Technique for Measurement of Methylmalonic Acid in Cattle Urine

Journal of Dairy Science, 1977
Methylmalonic acid was measured in cattle urine by decarboxylating it to propionate with sulfuric acid and heat and quantifying the propionate so formed by gas-liquid chromatography. Crystalline methylmalonic acid added to cow urine was recovered quantitatively.
E P, Barton, J M, Elliot
openaire   +2 more sources

An eye on long‐duration spaceflight: Controversies, countermeasures and challenges

Experimental Physiology, Volume 111, Issue 9, Page 4004-4014, 1 September 2026.
Abstract Space flight‐associated neuroocular syndrome (SANS) is a consequence of long‐duration space flight and is detected in two‐thirds of astronauts. In‐flight, this can cause a change in the refraction of the eyes, requiring graded hypermetropic ‘superfocus adjustable’ glasses, optic nerve head oedema and choroidal folds.
Vincent Wing Sum Ng, Susan Patricia Mollan   +1 more
wiley   +1 more source

Imerslund‐Gräsbeck Syndrome Caused by Compound Heterozygous Mutations in the AMN Gene: A Case Report

Clinical Case Reports, Volume 14, Issue 8, August 2026.
ABSTRACT The 7‐year‐old girl had recurrent anemia for 6 years, showing large cell anemia. The parent‐derived AMN double heterozygous mutation was detected to confirm the diagnosis of IGS. The hemogram was normal after intramuscular injection of vitamin B12, and there were no other complications.
Cheng Chen, Yijia Min, Xiaoping Ye, Yu Ma, Huiqing Ge, Jingying Chou, Xiaoling Yang, Yingying Cui, Xiaochun Zhang   +8 more
wiley   +1 more source

Two newborns with nutritional vitamin B12 deficiency: challenges in newborn screening for vitamin B12 deficiency

Haematologica, 2005
Vitamin B12 deficiency causes decreased Methionine Synthase and L-Methylmalonyl-CoA Mutase activity and results in accumulation of Homocysteine, Methylmalonic acid and Propionylcarnitine.
CD Campbell, J Ganesh, C Ficicioglu
doaj  

Effects of Exogenous Monosodium Glutamate on GABA Accumulation and Volatile/Nonvolatile Metabolites in Black Highland Barley

Food Science &Nutrition, Volume 14, Issue 8, August 2026.
Overview of MSG‐assisted GABA enrichment and associated changes in amino acid, fatty acid, and volatile metabolite profiles in germinated black highland barley. ABSTRACT γ‐Aminobutyric acid (GABA) is a functional amino acid with multiple health benefits; however, the mechanism of its enrichment in black highland barley, particularly through precursor ...
Xiaohang Lu, Nana Ma, Yuan Wang
wiley   +1 more source

Evaluation of a Targeted LC–MS/MS Assay for Clinical Quantification of Urinary Organic Acids

Journal of Mass Spectrometry, Volume 61, Issue 8, August 2026.
ABSTRACT Gas chromatography–mass spectrometry (GC–MS) is the reference method for urine organic acid analysis but requires complex sample preparation and derivatization, limiting routine clinical use. We developed and validated a targeted Liquid chromatography–tandem mass spectrometry (LC–MS/MS) method for quantifying urinary organic acids relevant to ...
Earnest J. P. Daniel, Emily Garnett, Deepthi Rajapakshe, Sridevi Devaraj   +3 more
wiley   +1 more source

Folate catabolites in spot urine as non-invasive biomarkers of folate status during habitual intake and folic acid supplementation. [PDF]

, 2013
Folate status, as reflected by red blood cell (RCF) and plasma folates (PF), is related to health and disease risk. Folate degradation products para-aminobenzoylglutamate (pABG) and para-acetamidobenzoylglutamate (apABG) in 24 hour urine have recently ...
Berthold Koletzko (144194), Rauh-Pfeiffer Astrid, Demmelmair Hans, Astrid Rauh-Pfeiffer, Weith, Thea, Berthold Koletzko, Weith Thea, Marola van Lipzig (282250), Rauh-Pfeiffer, Astrid, Mareile Niesser, Rauh-Pfeiffer, Astrid A. M., Wolfgang Peissner (282252), Niesser Mareile, Vaes Wouter, Peissner Wolfgang, Moretti, Diego, Hans Demmelmair (212025), Demmelmair, Hans, Diego Moretti, Vaes, Wouter, Diego Moretti (282248), Wouter Vaes (282251), van Lipzig Marola, Koletzko Berthold, van Lipzig, Marola, Astrid Rauh-Pfeiffer (282249), Hans Demmelmair, Thea Weith, Wolfgang Peissner, Moretti Diego, Koletzko, Berthold, Marola van Lipzig, Thea Weith (282247), Peissner, Wolfgang, Wouter Vaes, Niesser, Mareile, Mareile Niesser (282246)   +36 more
core   +2 more sources

Splenic lymphoid hyperplasia in a cat presenting with hyperammonaemia, hypercalcaemia and hypercobalaminaemia

Veterinary Record Case Reports, Volume 14, Issue 3, August 2026.
Abstract A 5‐year‐old, male neutered, Bengal‐cross cat presented with progressive neurological signs (ataxia and torticollis). Initial haematology, serum biochemistry and electrolytes (including calcium) were unremarkable; however, ammonia was markedly elevated.
Kerry E. Rolph, Tim Scase, Owen Davies
wiley   +1 more source

Monitoring Methylmalonic Aciduria by NMR Urinomics

Molecules, 2020
The paper reports on monitoring methylmalonic aciduria (MMA)-specific and non-specific metabolites via NMR urinomics. Five patients have been monitored over periods of time; things involved were diet, medication and occasional episodes of failing to ...
Alina Nicolescu, Daniela Blanita, Chiril Boiciuc, Victoria Hlistun, Mihaela Cristea, Dorina Rotaru, Ludmila Pinzari, Ana Oglinda, Adela Stamati, Isabela Tarcomnicu, Andreea Tutulan-Cunita, Danae Stambouli, Sergiu Gladun, Ninel Revenco, Natalia Uşurelu, Calin Deleanu   +15 more
doaj   +1 more source