57 research outputs found
Original Research By Young Twinkle Students (ORBYTS): Ephemeris Refinement of Transiting Exoplanets III
We report photometric follow-up observations of thirteen exoplanets (HATS-1 b, HATS-2 b, HATS-3 b, HAT-P-18 b, HAT-P-27 b, HAT-P-30 b, HAT-P-55 b, KELT-4A b, WASP-25 b, WASP-42 b, WASP-57 b, WASP-61 b and WASP-123 b), as part of the Original Research By Young Twinkle Students (ORBYTS) programme. All these planets are potentially viable targets for atmospheric characterisation and our data, which were taken using the LCOGT network of ground-based telescopes, will be combined with observations from other users of ExoClock to ensure that the transit times of these planets continue to be well-known, far into the future
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Structure and Properties of Stoichiometric Complexes Formed by Sodium Poly(alpha,L-glutamate) and Oppositely Charged Surfactants
The conformational and structural properties of the stoichiometric complexes formed by poly(a.,Lglutamate) anions and alkyltrimethylammonium cations with chain lengths of twelve, sixteen, and eighteen carbon atoms were examined by circular dichroism, infrared, differential scanning calorimetry, and X-ray diffraction techniques. The polypeptide chains complexed with the surfactants adopt a.-helical conformations. The shorter surfactant alkyl chains, consisting of twelve and sixteen carbon atoms, are disordered in the complexes, while the longer surfactant chains of eighteen carbon atoms crystallize on a hexagonal lattice. All of the complexes are organized in lamellar structures consisting of alternating layers of poly(a.,Lglutamate) chains separated by bimolecular layers of the surfactants. The surfactant alkyl chains are interdigitated and perpendicular to the lamellar surfaces
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Structure and Morphology of Nylon 4 Chain-Folded Lamellar Crystals
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Self-Assembled Complexes of Synthetic Polypeptides and Oppositely Charged Low Molecular Weight Surfactants. Solid-State Properties
Solid-state properties of the stoichiometric complexes formed by sodium poly(a,L-glutamate)and oppositely charged low molecular weight surfactants (alkyltrimethylammonium bromides) wereexamined by circular dichroism, infrared, and X-ray diffraction techniques. The polypeptide chains inthe complexes were shown to be predominantly in the a-helical conformation at room temperature. Athigher temperatures, weakening or disruption of intramolecular hydrogen bonds stabilizing the a-helicalconformation was observed. The polypeptide-surfactant complexes were shown to adopt lamellarstructures in the temperature range 20-150 °C. The lamellae consist of alternating layers ofpolyglutamate chains and bimolecular layers of surfactant, with the surfactant alkyl chains alignedperpendicular to the lamellar surfaces and interdigitated
Self-Assembled Complexes of Synthetic Polypeptides and Oppositely Charged Low Molecular Weight Surfactants. Solid-State Properties
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