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  • 11
    Digitale Medien
    Digitale Medien
    The Product of Catalysed Diboration of Bis(4-methoxyphenyl)ethyne by Bis(pinacolato-O,O')diboron (1996)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 52 (1996), S. 1989-1991 
    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/S0108270196003836
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  • 12
    Digitale Medien
    Digitale Medien
    The Products of Catalysed Diboration of Bis(p-tolyl)ethyne and of 4-Cyanophenylethyne by Bis(catecholato-O,O')diboron (1996)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 52 (1996), S. 1991-1995 
    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/S0108270196006622
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  • 13
    Digitale Medien
    Digitale Medien
    (μ2-Pinacolato-O,O')-bis(pinacolato-O,O')diboron (1996)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 52 (1996), S. 2545-2547 
    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/S0108270196008177
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  • 14
    Digitale Medien
    Digitale Medien
    Life and times of the Bering land bridge (1996)
    [s.l.] : Nature Publishing Group
    Nature 382 (1996), S. 60-63 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The reconstruction of full-glacial vegetation of Beringia has been controversial2"5. The hypothesis of a productive grassland was based on fossils of large grazers in full-glacial sediments. High percentages of Artemisia in Beringian pollen spectra were interpreted as being attributable to a steppe ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/382060a0
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  • 15
    Digitale Medien
    Digitale Medien
    Telomerase activation by the E6 gene product of human papillomavirus type 16 (1996)
    [s.l.] : Nature Publishing Group
    Nature 380 (1996), S. 79-82 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Telomeres, composed of TTAGGG repeats, have been shown to shorten as a function of age in vivowu and during the passage of normal cells in vitro6'9'13'14. This loss of telomere sequences is thought to contribute to senescence14'15. Activation of a mechanism to restore telomeres, namely, ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/380079a0
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  • 16
    Digitale Medien
    Digitale Medien
    Adaptive slicing using stepwise uniform refinement (1996)
    Bingley : Emerald
    Rapid prototyping journal 2 (1996), S. 20-26 
    Details
    ISSN: 1355-2546
    Quelle: Emerald Fulltext Archive Database 1994-2005
    Thema: Maschinenbau
    Notizen: Presents a new adaptive slicing method for layered manufacturing. The CAD model is first sliced uniformly into slabs of thickness equal to the maximum available fabrication thickness. Each slab is then resliced uniformly as needed to maintain the desired surface accuracy. This approach improves on past work by determining the adaptive refinement through interpolation rather than extrapolation, and it is well suited for execution in a parallel processing computer. The method has been implemented successfully and tested with .STL CAD models on a Stratasys FDM 1600 rapid prototyping system, where typical measured build times were reduced by approximately 50 per cent without reducing overall surface accuracy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1108/13552549610153370
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  • 17
    Digitale Medien
    Digitale Medien
    The effect of CO2 on ethylene evolution and elongation rate in roots of sunflower (Helianthus annuus) seedlings (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 98 (1996), S. 0 
    Details
    ISSN: 1399-3054
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Both carbon dioxide and ethylene can affect the rate of root elongation. Carbon dioxide can also promote ethylene biosynthesis by enhancing the activity of 1-aminocylopropane-1-carboxylic acid (ACC) oxidase. Since the amount of CO2 in the soil air, and in the atmosphere surrounding roots held in enclosed containers, is known to vary widely, we investigated the effects of varying CO2 concentrations on ethylene production by excised and intact sunflower roots (Helianthus annuus L. cv. Dahlgren 131). Seedlings were germinated in an aeroponic system in which the roots hung freely in a chamber and were misted with nutrient solution. This allowed for treatment, manipulation and harvest of undamaged and minimally disturbed roots. While exposure of excised roots to 0.5% CO2 could produce a small increase in ethylene production (compared to roots in ambient CO2), CO2 concentrations of 2% and above always inhibited ethylene evolution. This inhibition of ethylene production by CO2 was attributed to a reduction in the availability of ACC: however, elevated CO2 had no effect on ACC oxidase activity. ACC levels in excised roots were depressed by CO2 at a concentration of 2% (as compared to ambient CO2), but n-malonyl-ACC (MACC) levels were not affected. Treating intact roots with 2% CO2 inhibited elongation by over 50%. Maximum inhibition of elongation occurred 1 h after the CO2 treatment began, but elongation rates returned to untreated values by 6 h. Supplying these same intact roots with 2% CO2 did not alter ethylene evolution. Thus, in excised sunflower roots 2% CO2 treatment reduces ethylene evolution by lowering the availability of ACC. Intact seedlings respond differently in that 2% CO2 does not affect ethylene production in roots. These intact roots also temporarily exhibit a significantly reduced rate of elongation in response to 2% CO2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1399-3054.1996.tb06698.x
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  • 18
    Digitale Medien
    Digitale Medien
    Localization of ethylene biosynthesis in roots of sunflower (Helianthus annuus) seedlings (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 96 (1996), S. 0 
    Details
    ISSN: 1399-3054
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Sunflower (Helianthus annuus L.) seedlings were grown in aeroponic chambers which allowed for easy access to and easy harvesting of undamaged roots. In different portions of these roots we followed the rate of ethylene production, levels of 1-aminocyclopropane-1-carboxylic acid (ACC), N-malonyl-ACC and ACC oxidase mRNA and activity of ACC oxidase. ACC oxidase was measured with an in vitro assay, ACC and N-malonyl-ACC by selected ion monitoring gas chromatography-mass spectrometry. Ethylene production was highest in the tip of the root and tower in the middle and basal (part nearest the hypocotyl) portions of the root. The levels of ACC and ACC oxidase mRNA mirrored the levels of ethylene production. The lowest quantities of N-malonyl-ACC were found in the root tips. Upon gentle transfer of seedlings from an aeroponic system to treatment tubes, ACC content transiently increased; the greatest increase occurred in the tips. This brief rise in ACC content was not correlated with an increase in ethylene production. ACC oxidase activity was lowest in the tip and higher in the middle and base; the opposite of the pattern of ethylene production. Treating the seedlings with ACC produced a rapid rise in ACC content and ethylene production and inhibited root elongation. ACC oxidase activity was not induced by ACC treatment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1399-3054.1996.tb00180.x
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  • 19
    Digitale Medien
    Digitale Medien
    REGION OF INFLUENCE REGRESSION FOR ESTIMATING THE 50-YEAR FLOOD AT UNGAGED SITES (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 32 (1996), S. 0 
    Details
    ISSN: 1752-1688
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie
    Notizen: : Five methods of developing regional regression models to estimate flood characteristics at ungaged sites in Arkansas are examined. The methods differ in the manner in which the State is divided into subregions. Each successive method (A to E) is computationally more complex than the previous method. Method A makes no subdivision. Methods B and C define two and four geographic subregions, respectively. Method D uses cluster/discriminant analysis to define subregions on the basis of similarities in watershed characteristics. Method E, the new region of influence method, defines a unique subregion for each ungaged site. Split-sample results indicate that, in terms of root-mean-square error, method E (38 percent error) is best. Methods C and D (42 and 41 percent error) were in a virtual tie for second, and methods B (44 percent error) and A (49 percent error) were fourth and fifth best.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1752-1688.1996.tb03444.x
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  • 20
    Digitale Medien
    Digitale Medien
    Headspace Diacetyl as Affected by Stabilizers and Emulsifiers in a Model Dairy System (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 61 (1996), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Commercial stabilizers and emulsifiers were examined for effects on headspace diacetyl at 0.05, 0.10, and 0.20% (wt/wt) in a 5% milkfat model system. Headspace diacetyl was determined by recovery with dynamic headspace sampling. Headspace diacetyl decreased with increasing system viscosity. Guar gum and carrageenan resulted in similar decreases in headspace diacetyl when corrected for viscosity. Xanthan gum resulted in the greatest decrease in headspace diacetyl after correction for viscosity at increasing gum levels. Lecithin had no effect on viscosity; however, it decreased headspace diacetyl in direct relation to lecithin level. Carboxymethyl cellulose increased viscosity and decreased headspace diacetyl.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1996.tb10902.x
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