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Nano-dimensions for the pyrogallol[4]arene cavity.

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The cup-like cavity of pyrogallol[4]arenes has been deepened by the addition of four hydrogen bonded bipyridine molecules to the upper-rim of the calixarene, enabling the extended cup-like molecules to stack inside one another and consequently trap and completely enshroud a single guest molecule

Molecules at close range: encapsulated solvent molecules in pyrogallol[4]arene hexameric capsules.

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[reaction: see text] Pyrogallol[4]arenes form hexameric capsules with a large cavity and can be regarded as nanoreactors. The (1)H NMR signals of the encapsulated chloroform and benzene molecules are very complex, which may indicate that these encapsulated molecules are trapped in slightly different

Pyrogallol poisoning of pigeons caused by acorns.

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Green acorns are known to contain high concentrations of pyrogallol. Here, we describe an extended case report of two pigeons found dead with a filled muscular stomach of acorns. The following pathologic findings were observed: irritation of mucosal membranes in the gastrointestinal tract, blackish

Self-assembly of magnesium-seamed hexameric pyrogallol[4]arene nanocapsules.

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The solvothermal synthesis of a metal-seamed hexameric nanocapsule from pyrogallol[4]arenes and magnesium is reported. The unique non-toxic and biocompatible nature of divalent magnesium cations in addition to the large inherent cavities make these nanocapsules promising for potential application in

Engineering the proximal heme cavity of catalase-peroxidase.

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Catalase-peroxidases (KatGs) are prokaryotic heme peroxidases with homology to yeast cytochrome c peroxidase (CCP) and plant ascorbate peroxidases (APXs). KatGs, CCP and APXs contain identical amino acid triads in the heme pocket (distal Arg/Trp/His and proximal His/Trp/Asp), but differ dramatically

Interconvertible vanadium-seamed hexameric pyrogallol[4]arene nanocapsules.

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Research into stimuli-responsive controlled self-assembly and reversible transformation of molecular architectures has received much attention recently, because it is important to understand and reproduce this natural self-assembly behavior. Here, we report two coordination nanocapsules with

X-ray structures of 4-chlorocatechol 1,2-dioxygenase adducts with substituted catechols: new perspectives in the molecular basis of intradiol ring cleaving dioxygenases specificity.

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The crystallographic structures of 4-chlorocatechol 1,2-dioxygenase (4-CCD) complexes with 3,5-dichlorocatechol, protocatechuate (3,4-dihydroxybenzoate), hydroxyquinol (benzen-1,2,4-triol) and pyrogallol (benzen-1,2,3-triol), which act as substrates or inhibitors of the enzyme, have been determined

Organic matter transformation in the environment investigated by quantitative electron paramagnetic resonance (EPR) spectroscopy: studies on lignins.

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The lignins separated from angiosperm and gymnosperm trees, peat and xylitic brown coal were investigated by quantitative EPR. Observed free radicals in lignins are sensitive to alkaline environment. Gaseous ammonia interacting with solid lignins in resonance cavity shifts quinone-hydroquinone

A molecularly imprinted sensor based on an electrochemiluminescent membrane for ultratrace doxycycline determination.

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A new molecularly imprinted sensor was developed based on an electroluminescent molecularly imprinted polymer (MIP) membrane and used for doxycycline determination. The MIP was prepared by electropolymerization of pyrogallol doped with alizarin red. An electrochemiluminescence (ECL) signal was

The role of distal tryptophan in the bifunctional activity of catalase-peroxidases.

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Catalase-peroxidases are bifunctional peroxidases exhibiting an overwhelming catalase activity and a substantial peroxidase activity. Here we present a kinetic study of the formation and reduction of the key intermediate compound I by probing the role of the conserved tryptophan at the distal haem

Superoxide Anion Generation, Superoxide Dismutase Activity, and Nitric Oxide Release in Human Internal Mammary Artery and Saphenous Vein Segments.

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BACKGROUND: Internal mammary artery (IMA) as conduit for a coronary artery bypass graft (CABG) stays patent longer and more often than saphenous vein (SV). However, the precise differences in the biology of IMA and SV are unclear. METHODS AND RESULTS: To examine inherent difference in superoxide

Selected dietary (poly)phenols inhibit periodontal pathogen growth and biofilm formation.

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Periodontitis (PD) is a chronic infectious disease mediated by bacteria in the oral cavity. (Poly)phenols (PPs), ubiquitous in plant foods, possess antimicrobial activities and may be useful in the prevention and management of periodontitis. The objective of this study was to test the antibacterial

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