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acetophenone/karies gigi
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14 hasil
Interaction of β-cyclodextrin as catalyst with acetophenone in asymmetric reaction: a theoretical survey.
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The asymmetric reduction of acetophenone with sodium borohydride in the presence of β-cyclodextrin (β-CD) as catalyst can improve selectivity and yield. The interaction between acetophenone and β-CD plays an important role for the reduction of acetophenone. This work studies the reaction of
Synthesis and antimicrobial activity of geranyloxy- and farnesyloxy-acetophenone derivatives against oral pathogens.
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The compounds 2',6'-dihydroxy-4'-geranyloxyacetophenone (1) and 2',6'-dihydroxy-4'-farnesyloxy-acetophenone (2) are oxyprenylated secondary metabolites extracted from plants belonging to the Rutaceae family. In this study, 1 and 2 were synthesized and tested for their antimicrobial activity toward
Unravelling the mechanism of the asymmetric hydrogenation of acetophenone by [RuX2(diphosphine)(1,2-diamine)] catalysts.
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The mechanism of catalytic hydrogenation of acetophenone by the chiral complex trans-[RuCl2{(S)-binap}{(S,S)-dpen}] and KO-t-C4H9 in propan-2-ol is revised on the basis of DFT computations carried out in dielectric continuum and the most recent experimental observations. The results of these
Modification of the response of olfactory receptors to acetophenone by CYP1a2.
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Olfaction is mediated by the binding of odorant molecules to olfactory receptors (ORs). There are numerous proteins in the nasal mucus, and they contribute to olfaction through various mechanisms. Cytochrome P450 (CYP) family members are known to be present in the olfactory epithelium and are
Ketonization of incarcerated acetophenone enol.
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A free-standing simple enol has been generated inside a carceplex. Rates of ketonization under various conditions were determined; ketonization is extremely slow as compared to the rate in solution. Complexed water is required, and the mechanism proceeds via formation of an enolate followed by
Odorant response properties of convergent olfactory receptor neurons.
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Information about odorant stimuli is thought to be represented in spatial and temporal patterns of activity across neurons in the olfactory epithelium and the olfactory bulb (OB). Previous studies suggest that olfactory receptor neurons (ORNs) distributed in the nasal cavity project to localized
Methacrylamide-methacrylate hybrid monomers for dental applications
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Objectives: The susceptibility of methacrylates to hydrolytic and enzymatic degradation may be a contributing factor limiting the clinical lifespan of resin composite restorations. The elimination of labile ester bonds is a potential
Concentration-dependent recruitment of mammalian odorant receptors.
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A fundamental challenge in studying principles of organization used by the olfactory system to encode odor concentration information has been identifying comprehensive sets of activated odorant receptors (ORs) across a broad concentration range inside freely behaving animals. In mammals, this has
Antiviral action of derivatives of omega-aminoacetophenone.
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Numerous structural analogues of 3-amino-4-hydroxy-omega-methylaminoacetophenone were tested for their effect on the multiplication of influenza virus (FM(1) strain) in embryonated eggs, infected via the allantoic cavity. Antiviral activity was found in omega-aminoacetophenones containing an amino
Incorporation of a Cp*Rh(III)-dithiophosphate Cofactor with Latent Activity into a Protein Scaffold Generates a Biohybrid Catalyst Promoting C(sp 2)-H Bond Functionalization
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A Cp*Rh(III)-dithiophosphate cofactor with "latent" catalytic activity was developed to construct an artificial metalloenzyme representing a new type of biohybrid catalyst which is capable of promoting C(sp2)-H bond functionalization within the β-barrel structure of nitrobindin (NB). To
Electronically tunable anion-π interactions in pyrylium complexes: experimental and theoretical studies.
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Noncovalent interactions of anions with electron-deficient aromatic rings that have been studied so far involve non-heteroaromatic or nitrogen-based heteroaromatic systems. Here we report the first case of an organic oxygenated aromatic system, in particular the tri-aryl-pyrylium tetrafluoroborate
Manganese enhanced MRI reveals functional circuitry in response to odorant stimuli.
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To investigate the circuitry involved in detecting odorants in the rodent brain, we developed a method using manganese-enhanced MRI (MEMRI) to map the flow of neural information from the olfactory sensory neurons (OSNs) to the central layers of the olfactory bulb. Studies have shown that Mn(2+)
Crystal structure and iterative saturation mutagenesis of ChKRED20 for expanded catalytic scope.
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ChKRED20 is an efficient and robust anti-Prelog ketoreductase that can catalyze the reduction of ketones to chiral alcohols as pharmaceutical intermediates with great industrial potential. To overcome its limitation on the bioreduction of ortho-substituted acetophenone derivatives, the X-ray crystal
Postnatal odorant exposure induces peripheral olfactory plasticity at the cellular level.
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Mammalian olfactory sensory neurons (OSNs) form the primary elements of the olfactory system. Inserted in the olfactory mucosa lining of the nasal cavity, they are exposed to the environment and their lifespan is brief. Several reports say that OSNs are regularly regenerated during the entire life
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