Results 71 to 80 of about 10,813 (223)
Acid zeta function and ajoint acid zeta function [PDF]
arXiv, 2010 In this paper we set up the theory of acid zeta function and ajoint acid zeta function, based on the theory, we point out a reason to doubt the truth of the Riemann hypothesis and also as a consequence, we give out some new RH equivalences.
arxiv
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
Methylmalonic acid and vitamin B12 in patients with heart failure
Hellenic Journal of Cardiology, 2020 Vitamin B12 deficiency among patients with heart failure (HF) may have been underestimated. High serum levels of methylmalonic acid (MMA) have been identified in several studies as an early indicator of vitamin B12 deficiency. Furthermore, MMA seems to constitute a biomarker of oxidative stress and mitochondrial dysfunction.
Kali Polytarchou +8 more
openaire +4 more sources
Is Amino-Acid Homochirality Due To Asymmetric Photolysis In Space? [PDF]
arXiv, 1999 Amino acids occurring in proteins are, with rare exceptions, exclusively of the L-configuration. Among the many scenarios put forward to explain the origin of this chiral homogeneity (i.e., homochirality), one involves the asymmetric photolysis of amino acids present in space, triggered by circularly polarized UV radiation.
arxiv
Journal of Diabetes Investigation, EarlyView.The concomitant use of metformin and PPI was significantly associated with an increased risk of vitamin B12 deficiency in patients with type 2 diabetes. ABSTRACT Introduction Vitamin B12 deficiency is one of the adverse drug reactions of metformin and proton pump inhibitors (PPIs).
Choungwon Jung, Soyoung Park, Hyunah Kim
wiley +1 more source
Are Strong Bronsted Acids Necessarily Strong Lewis Acids? [PDF]
arXiv, 2006 The Broensted and Lowry acid base theory is based on the capacity of proton donation or acceptance (in the presence or absence of a solvent) whereas the Lewis acid base theory is based on the propensity of electron pair acceptance or donation. We explore through DFT calculation the obvious question whether these two theories are in conformity with each
arxiv
Journal of Periodontal Research, EarlyView.Metabolomic fingerprints analyzed from oral rinses are able to distinguish between severe periodontitis (stage III/IV) patients and non‐periodontitis controls. ABSTRACT Aims To explore the potential of metabolomic profiles of oral rinse samples to distinguish between patients with severe periodontitis (stage III/IV) and non‐periodontitis controls. This
Madeline X. F. Kosho +4 more
wiley +1 more source
BMC PediatricsBackground Methylmalonic acidemia is a rare autosomal recessive disorder of propionate catabolism characterized by the accumulation of propionic acid and methylmalonic acid caused by methylmalonyl-CoA mutase deficiency.
Fumiya Yamashita +9 more
doaj +1 more source
The Factors of the Classification of Protein Amino Acids [PDF]
This paper is published in GLASNIK of Montenegrin Academy of
Science and arts, 2000, 13, pp. 173-194, 2006 In this work it is shown that three pairs of the factors appear to be the key, i.e. main factors of a natural classification of protein (canonical) amino acids within the amino acid (genetic) code. First pair: the factors of the habit of an amino acid molecule (size and polarity).
arxiv
Impact of Metformin Therapy on Vitamin B12 Levels in Patients With Type 2 Diabetes Mellitus
Endocrinology, Diabetes &Metabolism, Volume 8, Issue 3, May 2025.The association between metformin treatment in type 2 DM and vitamin B12 deficiency. ABSTRACT Introduction Diabetes mellitus (DM) is a serious health condition affecting people worldwide with a high prevalence rate. DM is classified according to its aetiology into type 1 diabetes mellitus (T1DM) and type 2 diabetes mellitus (T2DM); several risk factors
Sahar H. Mahmoud +3 more
wiley +1 more source