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1995 (1)
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1Author    JanuszVladimír Blasiaka, Zofia Kleinwächterb, RenataŽ. Walter3, AludovábRequires cookie*
 Title    Interaction of Organophosphorus Insecticide Methylparathion with Calf Thymus D N A and a Synthetic D N A Duplex  
 Abstract    The interaction of an organophosphorus insecticide m ethylparathion (O.O-dimethyl 0-4-nitrophenyl phosphorothioate) with double-stranded DNA was characterized by UV and circular dichroism (CD) spectroscopy. Two kinds of DNA were employed: calf thymus DNA (CT DNA) and a synthetic two-stranded oligomer of sequence 5'-d(TTG GA TCCG AA TT-C A A G CTT)-3\ Melting curves and CD spectra were taken for the DNAs in the presence of the insecticide at methylparathion/DNA base pair molar ratio of 0.5. The insecticide evoked a decrease of the melting tem perature and a broadening of the transition range for CT DNA. Similar effects were observed for the synthetic oligomer but they were less pronounced than in the case of CT DNA. M ethylparathion evoked a slight shift and an increase in the ampli­ tude of the negative band in the CD spectra of both DNAs. O btained results indicate that methylparathion may perturb the thermal stability and conformation of DNA, which is an evidence that the insecticide has an ability to interact directly with DNA. 
  Reference    Z. Naturforsch. 50c, 820—823 (1995); received August 8/Septem ber 19. 1995 
  Published    1995 
  Keywords    DNA, Methylparathion, Melting Curves, Circular Dichroism, Pesticides 
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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0820.pdf 
 Identifier    ZNC-1995-50c-0820 
 Volume    50 
2Author    S. Sh, A. Soulayman, HarfoushRequires cookie*
 Abstract    a lc u la tio n o f th e M e ltin g C u rv e s o f s o m e A lk a li-h a lid e s w ith C s C l S tr u c tu r e a n d th e ir T h e r m o d y n a m ic P r o p e r tie s a lo n g th e s e C u rv e s The paper presents a study of three semi-empirical laws of melting. The study utilises the Im­ proved Unsymmetrized Self-Consistent Field Method (IUSCFM) for strongly anharmonic crystals with complex lattice and the energy criterion in calculating the melting curves of some alkali-halides. The energy criterion was proven correct along the melting curves particularly in the case of CsCl type of structure. The calculations of the melting curves for crystals of nine alkali-halides (KCl, KBr, KI, RbCl, RbBr, Rbl, CsCl, CsBr, Csl) are presented. The thermodynamic properties of these salts along the curves are also determined. A comparison of the calculated results and the experimental data is included. 
  Reference    Z. Naturforsch. 44a, 513—518 (1989); received October 27 1988 
  Published    1989 
  Keywords    Melting curves, Alkali-halides, Thermodynamic properties, Energy criterion, CsCl structure 
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 TEI-XML for    default:Reihe_A/44/ZNA-1989-44a-0513.pdf 
 Identifier    ZNA-1989-44a-0513 
 Volume    44 
3Author    S. Sh, SoulaymanRequires cookie*
 Title    Theoretical Melting Curves of Alkali Halides  
 Abstract    An analysis of the melting curves of alkali halides is given. The study is based on the Improved Unsymmetrized Self-Consistent Field Method (IUSCFM) for strongly anharmonic crystals with complex lattice and the energy, entropy and Ross's criterions in calculating the melting curves of alkali halides. The anharmonicities up to sixth order have been taken into consideration. The energy criterion was proven to be the most correct one along the melting curves of the high pressure modification (CsCl structure) while the entropy and Ross's criterions lead to a little better agreement with experiment than the energy criterion when dealing with rocksalt structure. Calculations of the melting curves of KCl and CsCl are compared with the experimental results. 
  Reference    Z. Naturforsch. 47a, 753—760 (1992); received January 20 1992 
  Published    1992 
  Keywords    Alkali halides, Melting curves, Energy criterion, Entropy criterion, Ross's criterion 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0753.pdf 
 Identifier    ZNA-1992-47a-0753 
 Volume    47