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NMR identification of hydrophobic cavities with low water occupancies in protein structures using small gas molecules.

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Magnetization transfer through dipole-dipole interactions (nuclear Overhauser effects, NOEs) between water protons and the protons lining two small hydrophobic cavities in hen egg-white lysozyme demonstrates the presence of water molecules with occupancies of approximately 10-50%. Similarly, NOEs

Anaesthesia in Chest Surgery, with Special Reference to Controlled Respiration and Cyclopropane: (Section of Anaesthetics).

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Problems in chest surgery: Cases with prolonged toxaemia or amyloid disease require an anaesthetic agent of low toxicity. When sputum or blood are present in the tracheobronchial tree the anaesthesia should abolish reflex distrubances and excessive sputum be removed by suction. The technique should

Anæsthesia in Chest Surgery, with Special Reference to Controlled Respiration and Cyclopropane: (Section of Anæsthetics).

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Problems in chest surgery: Cases with prolonged toxæmia or amyloid disease require an anæsthetic agent of low toxicity. When sputum or blood are present in the tracheobronchial tree the anæsthesia should abolish reflex distrubances and excessive sputum be removed by suction. The technique should

Demethylenation of Cyclopropanes via Photoinduced Guest-to-Host Electron Transfer in an M6 L4 Cage.

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Unusual demethylenation reactions of cyclopropanes under UV-light irradiation were found within a cavity of a photoactive coordination cage. The reaction proceeded via a guest-to-host electron transfer owing to the highly electron-deficient nature of the cage. The reactions were highly

Trapping an unprecedented Ti3C3 unit inside the icosahedral C80 fullerene: a crystallographic survey.

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The sub-nanometer cavity of fullerene cages is an ideal platform to accommodate otherwise unstable species for accurate structural characterization with, for example, rather accurate single crystal X-ray diffraction (XRD) crystallography. Herein, we report the successful entrapment of an isolated

Kinetics of anesthetic-induced conformational transitions in a four-alpha-helix bundle protein.

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Inhaled anesthetics are thought to alter the conformational states of Cys-loop ligand-gated ion channels (LGICs) by binding within discrete cavities that are lined by portions of four alpha-helical transmembrane domains. Because Cys-loop LGICs are complex molecules that are notoriously difficult to

Oxidation of ultrafast radical clock substrate probes by the soluble methane monooxygenase from Methylococcus capsulatus (Bath).

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Radical clock substrate probes were used to assess the viability of a discrete substrate radical species in the mechanism of hydrocarbon oxidation by the soluble methane monooxygenase (sMMO) from Methylococcus capsulatus (Bath). New substituted cyclopropane probes were used with very fast

Dispersive interactions in solution complexes.

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Dispersive interactions are known to play a major role in molecular associations in the gas phase and in the solid state. In solution, however, their significance has been disputed in recent years on the basis of several arguments. A major problem until now has been the separation of dispersive and

Non-monotonous Lattice Distortion Model for Gas Hydrates.

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Gas hydrate forms when the hydrogen bonded crystal structure of water entraps small-sized gas molecules at relatively low temperature and high pressure. Experimental and spectroscopic studies prove that the inclusion of guest into an empty cavity leads to distortion of hydrate lattice via either

Proton magnetic resonance characterization of the dynamic stability of the heme pocket in myoglobin by the exchange behavior of the labile proton of the proximal histidyl imidazole.

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The assigned exchangeable proton signals in the proton nuclear magnetic resonance spectra of sperm whale deoxy and Met-cyano myoglobin in H2O solution were found to exhibit pH-dependent saturation transfer from the bulk water, which allowed determination of the kinetics and mechanism of the labile

Control over the Redox Cooperative Mechanism of Radical Carbene Transfer Reactions for the Efficient Active-Metal-Template Synthesis of [2]Rotaxanes.

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A 5,15- bis (1,1'-biphenyl)porphyrin-based molecular clip covalently connected to a ditopic aliphatic ester loop moiety yields a semi-rigid macrocycle with a well-defined cavity. The resulting macrocycle fits the structural requirements for the preparation of porphyrinates capable of promoting

Demonstration of In Vitro Host-Guest Complex Formation and Safety of para-Sulfonatocalix[8]arene as a Delivery Vehicle for Two Antibiotic Drugs.

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The macrocycle para-sulfonatocalix[8]arene, sCX[8], was examined with 2 antibiotic drugs, ciprofloxacin (CIP) and isoniazid. The drugs were shown to form complexes with sCX[8] using proton nuclear magnetic resonance, thermogravimetric analysis, fluorescence spectroscopy, and molecular modeling. Both

Proton NMR study of model substrate binding in hemoproteins. Intercalation of mercuric triiodide in sperm whale met-aquo myoglobin.

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1H-NMR spectra have been recorded for sperm whale met-aquo myoglobin intercalated with xenon, cyclopropane, mercuric triiodide and auric triiodide. All four agents are known to intercalate on the proximal side of the heme over pyrrole A. The complexes of xenon and cyclopropane exhibit insignificant

Side arm strategy for catalyst design: modifying bisoxazolines for remote control of enantioselection and related.

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In asymmetric catalysis, the remote control of enantioselection is usually difficult due to the long distance communication between the chiral center of the catalyst and the reactive site of the substrate. The development of efficient and highly enantioselective catalysts for such reactions is of

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