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1Author    Liuping Chen, Thomas Gross, Hans-Dietrich LüdemannRequires 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 
2Author    H.-D LüdemannRequires 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 
3Author    B. Rigitte, S. ChobertRequires 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 
4Author    D. Girlich, H.-D Lüdemann, C. Buttersack, K. BuchholzRequires 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 
5Author    Bai Zhu, G.Wilse RobinsonRequires 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 
6Author    K. T. RindierRequires 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 
7Author    Z. NaturforschRequires 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 
8Author    N. Sathyan, V. Santhanam, J. SobhanadriRequires 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