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  • 2005-2009
  • 1995-1999  (121)
  • 1970-1974
  • 1999  (121)
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  • 2005-2009
  • 1995-1999  (121)
  • 1970-1974
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Magnetic properties of RTSb3 (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4759-4761 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Magnetization, electrical resistivity, and thermal expansion measurements have been performed on polycrystalline RTSb3 (R=La, Ce, Pr, Nd, Gd, Tb, and Dy; T=Cr, V) samples in order to study their magnetic properties. Depending on the rare-earth element, RTSb3 has been found to have either a purely ferromagnetic (or antiferromagnetic) phase or combination of antiferromagnetic (lower-temperature) and ferromagnetic (higher-temperature) phases. The antiferromagnetic order evolves from the ferromagnetic order as a result of the competition between R3+ and Cr3+ ions. As R is changed from La to Dy, the antiferromagnetic ordering of the R3+ ions becomes more prominent and predominate over the ferromagnetic ordering of Cr3+ for R=Gd, Tb, and Dy. Thermal expansion measurements show that the antiferromagnetic transition accompanies a drop in the sample dimension. The order of the ferromagnetic transition is found to be of the second order. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.370472
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  • 2
    Digitale Medien
    Digitale Medien
    Elimination of hillock formation in Al interconnects using Ni or Co (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 625-633 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The effect of using bilayer Ni/Al-1%Cu or Co/Al-1%Cu metallization stacks with regard to hillock formation is investigated in this study and compared to hillock suppression capabilities of Al-1%Si and Al-1%Cu single layer films and Ti/Al-1%Cu bilayer metallization stacks. Various heat treatments during and immediately after depositions were used to study the resistances of different metallization stack specimens to hillock formation. The densities and sizes of hillocks were characterized using scanning electron microscopy and atomic force microscopy, while interfacial reactions between the transition metal layer and Al-1%Cu in the metallization stack were examined using glancing angle x-ray diffraction. Resistivities of the bilayer metallization stacks were characterized using conventional four-point probe measurements. Our studies indicate that metallization processes involving bilayer metallization stacks of nickel and cobalt with Al-1%Cu are more robust compared to those involving titanium with Al-1%Cu. The mechanism of hillock formation is analyzed in light of intermetallic compound formation and stress-strain considerations. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.370776
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  • 3
    Digitale Medien
    Digitale Medien
    4-Heptamethyleneimino-7-nitrobenzo-2-oxa-1,3-diazole (1999)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 252-254 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108270198012128
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  • 4
    Digitale Medien
    Digitale Medien
    The twisted structure of 9-(4-cyanophenyl)carbazole (1999)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 1299-1300 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108270199005752
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  • 5
    Digitale Medien
    Digitale Medien
    Morphological and cytoskeletal changes caused by non-membrane damaging cytotoxin of Vibrio cholerae on Int 407 and HeLa cells (1999)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 179 (1999), S. 0 
    Details
    ISSN: 1574-6968
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Vibrio cholerae produces a non-membrane damaging cytotoxin (NMDCY), also known as cell rounding factor, which causes rapid rounding of cultured cells like HeLa, CHO and Vero and reportedly elicits enterotoxic activity in the rabbit ileal loop assay. Pursuing the concept that NMDCY might be an accessory factor contributing to the diarrhea caused by V. cholerae, we investigated the effect of NMDCY on Int 407 (intestinal cell line) and HeLa (non-intestinal cell line) cells using light, fluorescent and electron microscopy to gain insight into the cellular response evoked by NMDCY. Binding assays showed that NMDCY has affinity for both Int 407 and HeLa cells. Changes in the internal organelles and cytoskeletal structures of the cell lines were documented indicating changes in the secretory and metabolic function of the toxin-treated cells. Toxin-treated cells visualized under the electron microscope revealed retraction of cell body, formation of blebs on cell surface, changes in mitochondria having dilated and rarefied matrix and an extensively developed Golgi apparatus, endoplasmic reticulum and lysosomes compared to those in normal cells. Immunofluorescence study showed restructuring of microfilament network represented by actin, filamin and vinculin, as also of the microtubular component, tubulin and the intermediate filament, vimentin. Immunogold study further revealed that the toxin is internalized even within the nucleus. Moreover, a rise in the intracellular calcium level of the NMDCY-treated cells leads us to hypothesize that a cascade of events results in the final impairment of the cell machinery.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1574-6968.1999.tb08736.x
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  • 6
    Digitale Medien
    Digitale Medien
    Adhesion and invasion of a mutant Shigella flexneri to an eukaryotic cell line in absence of the 220-kb virulence plasmid (1999)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 181 (1999), S. 0 
    Details
    ISSN: 1574-6968
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: A Shigella flexneri strain, cured of the large 220-kb virulence plasmid, expresses adhering and invading ability in confluent monolayers of HeLa cells similar to its parent strain. Invasion by both the parent and the cured strains resulted in alteration of the monomeric actin (G) in the total actin pool of HeLa cells. Other indicators of invasive characteristics of virulent Shigella strains such as production of keratoconjunctivitis in guinea pig eye in vivo, Congo red binding and expression of contact hemolysin however, indicated loss of invasive properties in the plasmid cured strain. Further, pretreatment of bacterial cells with para-bromophenacyl bromide (p-BPB), a specific chemical inhibitor of phospholipase A, adversely affected adhesion to and invasion of HeLa cells in vitro, irrespective of the presence of the 220-kb plasmid indicating the possible involvement of the enzyme phospholipase A in the invasion process. Adherence of both the strains to guinea pig colonic epithelial cells (CECs) in vitro was reduced significantly on pretreatment of bacteria or CECs with p-BPB. Expression of exocellular enzymes viz. protease, elastase, phospholipase A and phospholipase C were not related to the large plasmid.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1574-6968.1999.tb08854.x
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  • 7
    Digitale Medien
    Digitale Medien
    Production of xylitol by Candida peltata (1999)
    Springer
    Journal of industrial microbiology and biotechnology 22 (1999), S. 633-636 
    Details
    ISSN: 1476-5535
    Schlagwort(e): Keywords: xylitol production; xylose fermentation; mixed sugars utilization; Candida peltata
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Candida peltata NRRL Y-6888 to ferment xylose to xylitol was evaluated under different fermentation conditions such as pH, temperature, aeration, substrate concentration and in the presence of glucose, arabinose, ethanol, methanol and organic acids. Maximum xylitol yield of 0.56 g g−1 xylose was obtained when the yeast was cultivated at pH 6.0, 28°C and 200 rpm on 50 g L−1 xylose. The yeast produced ethanol (0.41 g g−1 in 40 h) from glucose (50 g L−1) and arabitol (0.55 g g−1 in 87 h) from arabinose (50 g L−1). It preferentially utilized glucose 〉 xylose 〉 arabinose from mixed substrates. Glucose (10 g L−1), ethanol (7.5 g L−1) and acetate (5 g L−1) inhibited xylitol production by 61, 84 and 68%, respectively. Arabinose (10 g L−1) had no inhibitory effect on xylitol production.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/sj.jim.2900674
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  • 8
    Digitale Medien
    Digitale Medien
    On the Distribution of the Extremes of Unequally Correlated Normal Variables with Applications to Antedependent Cluster Data (1999)
    Springer
    Annals of the Institute of Statistical Mathematics 51 (1999), S. 301-322 
    Details
    ISSN: 1572-9052
    Schlagwort(e): Unequal but small correlations ; distribution of order statistics ; tail probability
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract Based on a small correlations approach, this paper deals with the probability distributions of the order statistics under a general Gaussian model with unequal (positive or negative) correlations. Illustrations are given for the cluster data those follow suitable antedependence models.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1003810208881
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  • 9
    Digitale Medien
    Digitale Medien
    The Stellar Populations in Local Group Dwarf Galaxies (1999)
    Springer
    Astrophysics and space science 267 (1999), S. 193-199 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1002756600199
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  • 10
    Digitale Medien
    Digitale Medien
    New iron(III) complexes with thiosemicarbazones derived from 5-methyl-3-formylpyrazole (1999)
    Springer
    Transition metal chemistry 24 (1999), S. 425-430 
    Details
    ISSN: 1572-901X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract New iron(III) complexes of 5-methyl-3-formylpyrazole thiosemicarbazone (HMPzTS) and 5-methyl-3-formylpyrazole-4-phenylthiosemicarbazone (HMPzPTS), namely [Fe(MPzTS)2]X and [Fe(MPzPTS)2]X respectively, where X=Cl, NO3, SCN and ClO4, have been synthesised and physico-chemically characterised by magnetic measurements (polycrystalline state), electronic, i.r., e.s.r. and Mössbauer spectra. All are cationic complexes containing two monoprotonic tridentate ligands with NNS donor sites and an anionic counterpart; they behave as 1:1 electrolytes in MeOH/DMF. Coordination to central iron(III) via the pyrazolyl nitrogen (2N), the azomethine nitrogen and the thiolato sulphur atom is confirmed in the complexes from i.r. data. E.s.r. data (RT & LNT) reveal the presence of a spin-paired iron(III) cation with d2 xyd2 yzd1 xy configuration. The 57Fe Mössbauer spectral data (RT) are commensurate with the presence of two iron(III) spin states, the percentage of each being dependent upon the counterion of the species.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006919018997
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