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Titolo:
Low-temperature heat capacity and glassy behavior of lysozyme crystal
Autore:
Miyazaki, Y; Matsuo, T; Suga, H;
Indirizzi:
Osaka Univ, Grad Sch Sci, Res Ctr Mol Thermodynam, Toyonaka, Osaka 5600043, Japan Osaka Univ Toyonaka Osaka Japan 5600043 m, Toyonaka, Osaka 5600043, Japan Osaka Univ, Grad Sch Sci, Dept Chem, Toyonaka, Osaka 5600043, Japan Osaka Univ Toyonaka Osaka Japan 5600043 m, Toyonaka, Osaka 5600043, Japan
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 33, volume: 104, anno: 2000,
pagine: 8044 - 8052
SICI:
1520-6106(20000824)104:33<8044:LHCAGB>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
INELASTIC NEUTRON-SCATTERING; GAMMA-RESONANCE ABSORPTION; X-RAY-DIFFRACTION; STRUCTURAL BASIS; PROTEIN DYNAMICS; MOSSBAUER-SPECTROSCOPY; CRYSTALLIZATION BEHAVIOR; METMYOGLOBIN CRYSTALS; RIBONUCLEASE-A; WATER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
75
Recensione:
Indirizzi per estratti:
Indirizzo: Miyazaki, Y Osaka Univ, Grad Sch Sci, Res Ctr Mol Thermodynam, Toyonaka, Osaka 5600043, Japan Osaka Univ Toyonaka Osaka Japan 5600043 Osaka 5600043, Japan
Citazione:
Y. Miyazaki et al., "Low-temperature heat capacity and glassy behavior of lysozyme crystal", J PHYS CH B, 104(33), 2000, pp. 8044-8052

Abstract

Heat capacities of tetragonal hen egg-white lysozyme crystals containing different amounts of water have been measured In the temperature region between 8 and 300 K, A broad glass transition was observed at about 150 K for the crystals with more than 24.0 wt % water content. These crystals also exhibited a spontaneous exothermic effect due to crystallization of the supercooled water contained in the crystals and melting process of the water above the glass transition temperature. The crystals containing 13.6 and 7.4 wt%, Of Water gave rise to only a glass transition at 165 and 218 K, respectively. The fully dried crystal showed no thermal anomaly in the temperatureup to 300 K, The amounts of the freezable and unfreezable water were estimated from the enthalpies of fusion of the crystal water. The water content dependence of the glass transition temperature and the magnitude of the excess heat capacity suggest that the observed glass transition arises from the cooperative motion between the segments of the lysozyme molecules and thebound water molecules.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 16/07/20 alle ore 20:02:15