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1	Author	Liuping Chen, Thomas Gross, Hans-Dietrich Lüdemann	Requires cookie*
	Title	The T, /7-Dependence of the Chemical Shift of the Hydroxyl Protons in Deeply Supercooled Methanol and Water
	Abstract	The hydroxyl proton chemical shifts 6 (H-O) of supercooled methanol (7" min = 149 K) and water have been determined (7" min = 183 K), and the pressure dependence of these shifts was measured up to 200 MPa. In both compounds the downfield shift of <5 (H-O) continues down to the lowest tempera-tures reached. This result disagrees with the two state models for the hydrogen bond formation in both liquids. The isotherms ö (H 2 0) show for T< 273 K an upfield shift that becomes more pronounced with decreasing temperature. For 6 (H-O-CH^), increasingp causes at all temperatures a downshift.
	Reference	Z. Naturforsch. 55a, 473—477 (2000); received November 11 1999
	Published	2000
	Keywords	NMR, Supercooling, Pressure, Methanol, Water
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	TEI-XML for	default:Reihe_A/55/ZNA-2000-55a-0473.pdf
	Identifier	ZNA-2000-55a-0473
	Volume	55

2	Author	H.-D Lüdemann	Requires cookie*
	Title	The Interaction between Pyrimidine Nucleosides and Benzene in Aqueous Solution, studied by Proton Magnetic Resonance
	Reference	(Z. Naturforsch. 27b, 1196—1201 [1972]; received May 2/June 15 1972)
	Published	1972
	Keywords	Interaction, nucleosides, benzene, water, PMR
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	TEI-XML for	default:Reihe_B/27/ZNB-1972-27b-1196.pdf
	Identifier	ZNB-1972-27b-1196
	Volume	27

3	Author	B. Rigitte, S. Chobert	Requires cookie*
	Title	A Near-Infrared Spectroscopic Investigation of Water in Solutions with Proline, Glycinebetaine, Glycerol and Albumin
	Abstract	The (v2 + v3) com bination band o f water has been investigated in aqueous solutions o f proline, glycinebetaine and glycerol and in a three component solution with each o f these substances and albumin. It is shown that the hydrogen bonding strength between the water protons and proline or betaine is higher than between water and glycerol. Betaine exhibits a higher affinity versus the oxygen o f water than does proline. The water binding capacity o f pure proline solutions is unchanged in a three-com ponent solu tion with albumin. Proline neither enhances nor reduces the solubility o f this highly soluble pro tein. In contrast, in a three-com ponent solution with betaine, the solubility o f both betaine and al bum in is reduced. It is assumed that these solute particles com pete for the sam e binding position on the water m olecule. Concentrated glycerol solutions with very low water concentrations dissolve a considerable am ount o f albumin, which points to the fact that the protein must be partly dis solved in glycerol itself.
	Reference	Z. Naturforsch. 34c, 699—703 (1979); received February 2/M ay 29 1979
	Published	1979
	Keywords	Water, Protein, Proline, Betaine, Glycerol
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	TEI-XML for	default:Reihe_C/34/ZNC-1979-34c-0699.pdf
	Identifier	ZNC-1979-34c-0699
	Volume	34

4	Author	D. Girlich, H.-D Lüdemann, C. Buttersack, K. Buchholz	Requires cookie*
	Title	c , T-Dependence of the Self Diffusion in Concentrated Aqueous Sucrose Solutions
	Abstract	The self diffusion coefficients D of the water molecules and of sucrose have been deter mined by the pulsed field gradient NMR technique over a wide range of temperatures and concentrations (cmax: 70% w/w sue.). All temperature dependencies can be fitted to a Vogel-Tammann-Fulcher equation. The isothermic concentration dependence of D for the sucrose is given by a simple exponential concentration dependence.
	Reference	Z. Naturforsch. 49c, 258—264 (1994); received December 21993
	Published	1994
	Keywords	Diffusion, Sucrose, Water, Aqueous Solution
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	TEI-XML for	default:Reihe_C/49/ZNC-1994-49c-0258.pdf
	Identifier	ZNC-1994-49c-0258
	Volume	49

5	Author	Bai Zhu, G.Wilse Robinson	Requires cookie*
	Title	Sheng
	Abstract	The structure and properties of a 1.791 molal aqueous LiF solution is investigated by performing molecular dynamics simulations using a water model with both bond flexibility and instantaneously responsive polarization. On average, each cation is in close contact with about one anion. This causes a strong overlap of the hydration shells and an almost complete breakdown of the surround ing water structure. While the lone pairs of the hydration waters in the first Li+ shell occupy preferentially tetrahedral positions, the orientational distribution of the solvent molecules around F~ is quite uniform. By comparing various autocorrelation functions of water molecules in the solution and in the pure liquid, the influence of solvated ions on the translational, rotational and vibrational motions of hydration water can be studied. M o le c u la r D y n a m ic s S tu d y o f a n A q u e o u s L iF S o lu tio n
	Reference	Z. Naturforsch. 46a, 221—228 (1991); received October 4 1990
	Published	1991
	Keywords	Hydration, Ions, Water, Solubility, Ion-pairs
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	TEI-XML for	default:Reihe_A/46/ZNA-1991-46a-0221.pdf
	Identifier	ZNA-1991-46a-0221
	Volume	46

6	Author	K. T. Rindier	Requires cookie*
	Title	Die Temperaturabhängigkeit biologischer Prozesse Temperature-Dependence of Biological Process
	Abstract	Temperature dependence of biological processes is described by the modified Arrhenius equa tion, in which the constant is replaced by a temperature-variable coefficient. The theoretical foun dation for this replacement is given and experimentally verified. 1. Die Tem peraturabhängigkeit der Geschwindig keit chemischer Reaktionen wird durch die A rrhe niusgleichung beschrieben: v = v0 -e~ ElR T .
	Reference	Z. Naturforsch. 34c, 474 (1979); eingegangen am 11. April 1978
	Published	1979
	Keywords	Arrhenius Equation, Phase-Change, Water, Mitochondria, Metabolizing Cell
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	TEI-XML for	default:Reihe_C/34/ZNC-1979-34c-0474.pdf
	Identifier	ZNC-1979-34c-0474
	Volume	34

7	Author	Z. Naturforsch	Requires cookie*
	Title	Structure of the 2-Pyrrolidinone Monohydrate
	Abstract	The X-ray crystal structure of the 1:1 adduct shows a complicated network of water and 2-pyrrolidinone molecules where the carbonyl oxygen atom of 2-pyrrolidinone forms hy drogen bonds with protons of two separate water molecules and the NH proton of the 2-pyrrolidinone molecule interacts with the oxygen atom of a third water molecule.
	Reference	Z. Naturforsch. 54b, 1598—1601 (1999); received July 27 1999
	Published	1999
	Keywords	2-Pyrrolidinone, Water, Crystal Structure, Hydrogen Bond, Binary Mixture
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-1598.pdf
	Identifier	ZNB-1999-54b-1598
	Volume	54

8	Author	N. Sathyan, V. Santhanam, J. Sobhanadri	Requires cookie*
	Title	Conformational Analysis of Chloromethylenimine and its Hydrogen-Bonded Dimers with Water from the Study of Nuclear Quadrupole Interactions
	Abstract	A molecular conformation study on N-Chloromethylenimine and its 1:1 dimeric form with water has been carried out using the ab-initio method at 6-31 G and 6-31 G* basis set. We consider the two most stable conformers of the N-chloromethylenimine -water binary mixture involving double hydrogen bonds. In all cases the proton affinity has been calculated. Each system considered in this work has the nuclear quadrupole interactions of the nitrogen and chlorine resonant nuclei which have been calculated and compared. It is found that the nuclear quadrupole coupling constant for the nitrogen nucleus increases in the hydrogen bonded complexes and decreases for the chlorine nucleus compared to the monomeric values. The influence of proton affinity is reflected in the nuclear quadrupole coupling constant.
	Reference	Z. Naturforsch. 51a, 534—536 (1996); received November 20. 1995
	Published	1996
	Keywords	N-Chloromethylenimine, Water, Hydrogen bond Nuclear Quadrupole Coupling Con-stant, Proton Affinity, Ab-initio
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	TEI-XML for	default:Reihe_A/51/ZNA-1996-51a-0534.pdf
	Identifier	ZNA-1996-51a-0534
	Volume	51