The second committed step in chlorophyll biosynthesis is the transfer of a methyl group from S-adenosyl-l-methionine (SAM) to magnesium protoporphyrin IX (MgP) forming MgP monomethylester (MgPME). This reaction is catalyzed by the enzyme MgP methyltransferase (ChlM). Previous investigation of th...
Several spectrally different types of peripheral light harvesting complexes (LH) have been reported in anoxygenic phototrophic bacteria in response to environmental changes. In this study, two spectral forms of LH2 (T-LH2 and U-LH2) were isolated from Rhodobacter azotoformans. The absorption of ...
An efficient organocatalytic diastereo- and enantioselective Michael addition of α-substituted isocyanoacetates to 2-enoylpyridines catalyzed by cinchona alkaloid-derived squaramide has been achieved, affording the corresponding adducts with two adjacent tertiary-quaternary stereocenters in exc...
The asymmetric Friedel–Crafts reaction between methyl (E)-2-oxo-4-aryl-3-butenoates (1a–c) and activated benzenes (2a–d) has been efficiently catalyzed by the ScIII triflate complex of (4′S,5′S)-2,6-bis[4′-(triisopropylsilyl) oxymethyl-5′-phenyl-1′,3′-oxazolin-2′-yl]pyridine (pybox 3)....
Dimethyl 2,3-dialkyl-2,3-dichloro-butanedioates are efficiently prepared in dimethylformamide or dimethylsulphoxide, through reductive homo-coupling of methyl 2-bromo-2-chlorocarboxylates promoted by CuBrFe0.
CuBr-LiOCH3 in methanol efficiently promotes the reductive coupling of methyl α-bromo-α-chlorocarboxylates to dimethyl α,α′-dichloro-succinates.
The gas chromatography of mixtures of n-alkyl acetates (CH3COOR, R = C1—C8) and methyl esters of aliphatic n-carboxylic acids (R′COOCH3, R′ = C1—C8) and certain of their monochlorinated derivatives has been studied on Carbowax 20M and SE-30 glass capillary columns under the same operating co...
The title compound was synthesized in six steps from N-Cbz-L-alanine through asymmetric alkylation of a cis-2-phenyl-4-methyl-5-oxazolidinone with tert-butyl 4-iodobutyrate. The cis-2-phenyl-4-methyl-5-oxazolidinone was obtained via a new BF3•Et2O mediated condensation with benzaldehyde dimethyl...
Volatile free fatty acids (
This study investigated the effects of high pressure processing (HPP) on fatty acid composition and volatile compounds in Korean native black goat (KNBG) meat. Fatty acid content in KNBG meat was not significantly (p > 0.05) different among the control goats and those subjected HPP. The 9,12-oct...
Bicinchoninic acid (BCA) is reagent that is widely used to determine the concentration of proteins in solutions through the colored complex it forms with Cu(I) and the proteins. In this report, we present a new use for BCA, where a highly sensitive method for detection of cyanide ions in solutio...
Several flaviviruses, such as the yellow fever virus and the dengue virus cause severe and potentially lethal infection in man. Following up on our initial hit 3′,5′-bistritylated uridine 1, a series of alkylated nucleoside analogues were synthesized and evaluated for their in vitro antiviral ...
The use of Ceramic Matrix Composites (CMCs) in the hottest part of an aero engine promises great improvements in fuel efficiency by decreasing component weight and allowing higher gas inlet temperatures. However, an environmental barrier coating (EBC) is required to protect the CMC from the corr...
The preparation, sintering and low-temperature physical properties of four kinds of ytterbium sulfides (η-Yb2S3, ε-Yb2S3, Yb3S4 and YbS) were systematically investigated. The suitable sintering processes were ensured for each ytterbium sulfide. SEM results suggested the sintered ytterbium sulf...
Si-rich ytterbium silicide was fabricated by through an arc-melting technique for applying use as a bond coat material in an environmental barrier coating system. Evaluation of its potential was accomplished through oxidation tests in dry air and an inert atmosphere. The experimental results sho...
The nuclear spins of 11 d Nd147 and 2.6 y Pm147 have been measured to be I = 52 and I = 72 respectively by the atomic beam magnetic resonance method. The result for Nd147 confirms an earlier measurement made by paramagnetic resonance. The result for Pm147 is surprising in view of the fact that n...
The mechanism of the abnormal increase in extracellular glutamate concentration in the hippocampus induced with 100 mM KCl in zinc deficiency is unknown. In the present study, the changes in glutamate release (exocytosis) and GLT-1, a glial glutamate transporter, expression were studied in young...
In the present study, a model of zinc deficiency was developed by exposing primary neurons to an N,N,N′,N′-Tetrakis (2-pyridylmethyl) ethylenediamine (TPEN)-containing medium. The cell survival rate, apoptosis rate, intracellular and extracellular concentrations of 4 amino acids, and the expre...
We demonstrated a protocol of incorporating the graphene oxide sheets on the surface of Zinc-Glutamate metal-organic framework (MOF) microcrystalline by electrostatic attraction and carbonizing this composite to synthesis the nanoporous carbon. The etching of facets in Zinc-Glutamate MOF microcr...
The alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) subtype of ionotropic glutamate receptors mediates most fast excitatory transmission. Glutamate binding to AMPA receptors (AMPARs) causes most AMPARs to rapidly and completely desensitize, and their desensitization kinetics infl...
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