In this paper we give various finiteness results concerning terms of recurrence sequences Un representable as a sum of S-units with a fixed number of terms. We prove that under certain (necessary) conditions, the number of indices n for which Un allows such a representation is finite, and can be...

A compact Brillouin thulium-doped fluoride fiber (TDFF) multi-wavelength fiber lasers (MWFLs) operating in the S/S+ band region is proposed and demonstrated. The system is based on a linear design and utilizes two Faraday mirrors at both ends of the cavity to enable bi-directional oscillation. A...

For an integer s≥0, a graph G is s-hamiltonian if for any vertex subset S⊆V(G) with |S|≤s, G−S is hamiltonian, and G is s-hamiltonian connected if for any vertex subset S⊆V(G) with |S|≤s, G−S is hamiltonian connected. Thomassen in 1984 conjectured that every 4-connected line graph is hamilton...

The study of s−s¯ asymmetry is essential to better understand of the structure of nucleon and also the perturbative and nonperturbative mechanisms for sea quark generation. Actually, the nature and dynamical origins of this asymmetry have always been an interesting subject to research both expe...

Nutrient losses in our food chain severely surpass our planetary boundaries. Resource recovery can contribute to mitigation, for instance through converting wastewater resources to microbial protein for animal feed. Wastewater typically holds a complex mixture of organics, posing a challenge to ...

Publisher SummaryCysteinesulfinic acid (CSA), or β-sulfinyl-α-aminopropionic acid, is accepted as a structural analog of aspartic acid by the L-aspartate amino-transferase (glutamic-oxaloacetic transaminase) from both animal and bacterial sources. Evidence for that conclusion is found in the c...

The γ-aminobutyric acid (GABA) synthesizing enzyme,l-glutamate decarboxylase (GAD), and the taurine synthesizing enzyme, cysteinesulfinic acid decarboxylase (CSAD) have been localized in rat retina at the ultrastructural level by indirect immunoelectron microscopy. GAD immunoreactivity (GAD-IR)...

1.1. L-Cysteinesulfinic dehydrogenase, the enzyme which catalyzes the dehydrogenation of L-cysteinesulfinic acid, requires a coenzyme for activity. The coenzyme requirement is not fulfilled by known vitamins, coenzymes, or related substances, but boiled yeast extract is a good source of the cofa...

Publisher SummaryThis chapter discusses the assay procedures, using High-Performance Liquid Chromatography (HPLC), that are simple and specific for cysteinesulfinic acid and cysteic acid, and are readily applicable to the determination of these amino acids in biological samples. L-Cysteinesulfin...

1.1. The β-form of the cytosolic aspartate aminotransferase (cAAT) and the mitochondrial aspartate aminotransferase (mAAT) from ribbed mussel (Modiolus demissus = Gukensia demissa) gill tissue each exist as dimers of equal mol. wt (44,000).2.2. Both the cAAT and mAAT are reactive with β-l-cyst...

1.1. Homogenates and soluble extracts of rat liver mitochondrial acetone powder catalyze the rapid, coupled oxidation of cysteinesulfinate (CSA) and fumarate (or malate) to yield pyruvate, aspartate, and inorganic sulfate, as well as an analogous reaction between CSA and α-ketoglutarate to yiel...

1.1. A soluble enzyme preparation, obtained from Proteus vulgaris by ultrasonic disintegration, in the presence of suitable cofactors, catalyzes the rapid oxidation of L-cysteinesulfinic acid. The metabolism of the latter compound is shown to proceed by two simultaneous and competing pathways. I...

Publisher SummarySulfinic acids (RSO2H) are moderately stable compounds of limited natural occurrence. Only cysteinesulfinate and hypotaurine have been detected in tissues or physiological fluids of normal animals. Two additional sulfinic acids, β-sulfinopyruvate and β-sulfinoacetaldehyde, are...

The electrosynthesis, overoxidation and characterization of l-aspartic acid (l-Asp) imprinted polypyrrole (PPy) films have been performed by using electrochemical quartz crystal microbalance (EQCM). Following the determination of the optimal electrosynthesis parameters for the formation of a smo...

Metal-organic framework (MOF) materials have exhibited exponential growth over the last two decades and MOF membranes already show great potential in separation application. Herein the linker salt method was firstly applied to the preparation of MOF membranes using Ni-LAB [Ni2(L-asp)2(bipy)] mem...

This paper describes a new total synthesis for (S)-2-amino-7-methoxytetralin, (S)-7-MeO-AT, from l-aspartic acid in an overall yield of 10% over nine steps. The major loss was ascribed to a key intramolecular Friedel–Crafts cyclization step, which afforded up to 36% yield. Attempts to perform a...

Single crystals of pure and l-aspartic acid doped Zinc (Tris) Thiourea Sulphate (ZTS) were grown from aqueous solution by solution growth method. The cell parameters and structure of the grown crystals were determined by X-ray diffraction studies. The presence of functional group in the compound...

Potassium Dihydrogen Phosphate (KDP) doped with l-aspartic acid has been grown by solvent slow evaporation technique from a mixture of aqueous solution of KDP and 0.7% of l-aspartic acid at room temperature. The grown crystals were characterized by powder X-ray diffraction, UV–visible, FTIR ana...

Glutathione (GSH) is the archetypal antioxidant, and plays a central role in the protection of the ocular lens from cataract formation. High levels of GSH are maintained in the transparent lens, but with advancing age, GSH levels fall in the lens nucleus relative to outer cortical cells, thereby...

S-(1,2-Dicarboxyethyl)glutathione (DCE-GS) found in animal tissues or baker's yeast showed strong inhibitory effects on blood coagulation and platelet aggregation. The inhibitory effect of blood coagulation was almost the same as those of EDTA, oxalate, and citrate. DCE-GS did not show chel...