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  • 1
    Electronic Resource
    Electronic Resource
    Determination of geographic origin of caffeine by stable isotope analysis (1982)
    s.l. : American Chemical Society
    Analytical chemistry 54 (1982), S. 590-592 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00240a057
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  • 2
    Electronic Resource
    Electronic Resource
    Simultaneous multiple tendon ruptures complicating a seizure in a haemodialysis patient (2004)
    Melbourne, Australia : Blackwell Science Pty
    Nephrology 9 (2004), S. 0 
    Details
    ISSN: 1440-1797
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: SUMMARY:  Non-traumatic rupture of large tendons is identified as a contributor to morbidity in patients who receive haemodialysis. The injury is likely to become more common as the duration of survival on dialysis extends. A number of predisposing factors leading to tendon injury have been identified in the literature, including secondary hyperparathyroidism, β2-microglobulin associated amyloidosis, corticosteroid treatment and fluoroquinolone antibiotic use. This is a case report of a 31-year-old male who presented with simultaneous large tendon ruptures following epileptiform seizures. These occurred after 10 years of treatment for end-stage renal failure, including haemodialysis, with progressive secondary hyperparathyroidism. A review of the literature confirms progressive hyperparathyroidism as an important risk factor for large tendon rupture in patients on haemodialysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1797.2004.00269.x
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  • 3
    Electronic Resource
    Electronic Resource
    Genome-wide expression analysis of iron regulation in Burkholderia pseudomallei and Burkholderia mallei using DNA microarrays (2005)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 252 (2005), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Burkholderia pseudomallei and B. mallei are the causative agents of melioidosis and glanders, respectively. As iron regulation of gene expression is common in bacteria, in the present studies, we have used microarray analysis to examine the effects of growth in different iron concentrations on the regulation of gene expression in B. pseudomallei and B. mallei. Gene expression profiles for these two bacterial species were similar under high and low iron growth conditions irrespective of growth phase. Growth in low iron led to reduced expression of genes encoding most respiratory metabolic systems and proteins of putative function, such as NADH-dehydrogenases, cytochrome oxidases, and ATP-synthases. In contrast, genes encoding siderophore-mediated iron transport, heme-hemin receptors, and a variety of metabolic enzymes for alternative metabolism were induced under low iron conditions. The overall gene expression profiles suggest that B. pseudomallei and B. mallei are able to adapt to the iron-restricted conditions in the host environment by up-regulating an iron-acquisition system and by using alternative metabolic pathways for energy production. The observations relative to the induction of specific metabolic enzymes during bacterial growth under low iron conditions warrants further experimentation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/j.femsle.2005.09.043
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  • 4
    Electronic Resource
    Electronic Resource
    A study of the factors affecting the 180/160 ratio of the water of wine (1982)
    Springer
    European food research and technology 174 (1982), S. 355-359 
    Details
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Summary The18O enrichment of the water in some New Zealand wines was studied and the following results were found (a) Variations in the18O/16O ratio between different bottles of the same batch of wine were small. (b) Yearly variations of up to 3%o in the mean18O/16O ratios of wines produced in the same region occur and can be related to climatic effects. Enrichments above the ground-water18O/16O ratio ranged from + 3.9% to + 7.2%. (c) No differences were found between the18O/16O ratios of red and white wines produced in the same area and in the same year. (d) Differences of up to 2.2% were found between the18O/16O ratios of wines produced in different locations. (e) The range in ground-water18O/16O ratios in the New Zealand wine-producing areas varied from −8.9% to −6.7%. (f) Controlled laboratory dilution of a grape juice with water was reflected in a decrease in the18O/16O ratio of the resultant wine. (g) Wine produced from freeze concentrated grape juice was found to be depleted in18O.
    Notes: Zusammenfassung Die18O-Anreicherung des Wassers in Neuseeländischen Weinen wurde mittels Isotopenmassenspektrometric studiert, und die folgenden Ergebnisse wurden erhalten: a) Die Änderungen im18O/16O-Verhältnis zwischen Flaschen der gleichen Charge waren klein. b) Für Weine des gleichen Gebiets wurden18O/16O-Jahrgangsschwankungen his zu 3%o gefunden, die mit klimatischen Faktoren korrelierbar waren. Die18O-Anreicherung gegenüber dem Grundwasser lag bei +3,9% bis +7,2%. c) Zwischen Rotweinen und Weißweinen des gleichen Gebiets and Jahrgangs wurden keine Unterschiede beobachtet. d) Zwischen verschiedenen Weingebieten wurde ein örtlicher Unterschied bis zu 2,2%o gefunden. e) Die18O/16O-Verhältnisse des Grundwassers Neuseeländischer Weingebiete lagen zwischen −8,9% and −6,7%. f) Kontrollverschnitte von Traubensaft mit Wasser waren an abnehmenden18O/16O-Verhältnissen der entsprechenden Weine erkennbar. g) Aus gefrierkonzentriertem Traubensaft produzierte Weine waren an18O verarmt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01459952
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  • 5
    Electronic Resource
    Electronic Resource
    Oxygen isotope studies on some New Zealand grape juices (1982)
    Springer
    European food research and technology 175 (1982), S. 253-257 
    Details
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Summary The18O/16O ratios of the water of a number of grape juices were measured and the following observations were made: (1) The18O/16O ratio of the juice of a given grape does not change significantly during the course of 24 h. (2) Rain will only affect18O/16O ratios when the fruit is ripe. Uptake of this water in ripe grapes has a diluting effect on the18O enrichment of the juice. (3) The18O/16O ratios of several juice concentrates that had been prepared by rotary evaporation were found to be very similar to those of the control wines. (4) As harvested grapes lose water by evaporation through the skin, the juice remaining becomes more enriched in18O. (5) Fermenting grape juice into wine does not appreciably change the18O/16 ratio of the water.
    Notes: Zusammenfassung Bei der Messung der Wasser-18O/16O-Verhältnisse einer Anzahl von Traubensäften wurden folgende Ergebnisse ermittelt: 1. Innerhalb von 24 Std verändert sich das18O/16O-Verhältnis im Traubensaft bei einer bestimmten Pflanze nur wenig. 2. Die Aufnahme von Regenwasser in reife Trauben bewirkt eine Verdünnung der18O-Anreicherung des Saftes. 3. Das18O/16O-Verhältnis von mehreren durch Rotationsverdampfung hergestellten Traubensaftkonzentraten wurde gemessen und die Ergebnisse waren denen von Kontrollweinen ähnlich. 4. Bei der Verdunstung von Wasser durch die Schale gelesener Trauben wird der übrige Saft mit18O angereichert. 5. Die Vergärung von Most zu Wein ändert das18O/16O-Verhältnis des Wassers nicht wesentlich.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01892978
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  • 6
    Electronic Resource
    Electronic Resource
    Continental rifting at pre-existing lithospheric weaknesses (1988)
    [s.l.] : Nature Publishing Group
    Nature 333 (1988), S. 450-452 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Rifts do not occur randomly within continents, but tend to follow erogenic belts, and to avoid or branch around the stronger cratonic regions3"8. This suggests that the locations of continen-tal rifts are controlled by local variations in the pre-rift strength of continental lithosphere, rather ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/333450a0
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  • 7
    Electronic Resource
    Electronic Resource
    Student Response to Quantitative Aspects of Instruction in an Introductory Geology Course (2000)
    Springer
    Mathematical geology 32 (2000), S. 187-202 
    Details
    ISSN: 1573-8868
    Keywords: geophysical exercises ; large introductory class
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Because most universities and colleges require all students to take a laboratory science course, many geology classes are composed of large sections of nonscience majors. Pedagogic strategies based on small classes of highly motivated students are not effective in this application. It is particularly difficult to convey to these students the quantitative and discovery aspects of science and to demonstrate the importance of a basic knowledge of science and its methods to them as nonscientists. Student responses to quantitative initiatives taken in a large, introductory class of nonscience majors at Baylor University indicate that an overwhelming number of such students can be convinced of the importance of geological processes to their lives and that a majority of them can be interested in the application of elementary mathematics to the earth sciences if the application has a profound result with which they can identify. Hands-on, discovery-type, field exercises in which small laboratory sections acquire, process, and interpret geophysical data are effective in generating interest in the scientific process. Introductory courses that explore a relatively narrow breadth of material in some depth offer opportunities for discovery-based learning not available to the typical introductory survey course, which usually covers a wide breadth of material in very little depth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007575306293
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  • 8
    Electronic Resource
    Electronic Resource
    Use of13C/12C ratios for studying the origin of CO2 in sparkling wines (1982)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 311 (1982), S. 578-580 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary 13C/12C ratios were measured in an attempt to determine the origin of the CO2 in New Zealand commercial sparkling wines. This technique enabled a distinction to be made between CO2 originating from C-3 plants, C-4 plants and that originating from an industrial source. With the additional measurement of the alcohol13C/12C ratios, it was possible to draw conclusions as to the wine making techniques used.
    Notes: Zusammenfassung Die Messung von13C/12C-Isotopenverhältnissen wurde dazu benutzt, um in neuseeländischem Handelssekt den Ursprung des CO2 zu bestimmen. Mit dieser Methode konnte zwischen CO2 aus C-3- und aus C-4-Pflanzenprodukten und CO2 technischen Ursprungs unterschieden werden. Bei zusätzlichen13C/12C-Verhältnismessungen an Ethanol von Sektproben war es möglich, Rückschlüsse auf die Art der Sektherstellung zu ziehen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00635533
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  • 9
    Electronic Resource
    Electronic Resource
    Measurement of the 2H/1H ratios of the carbon bound hydrogen atoms in sugars (1981)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 317 (1981), S. 853-857 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Problems are encountered with the measurement of 2H/1H ratios in sugars because of the rapid and uncontrolled rate at which the hydroxyl hydrogen atoms can exchange with water. The values thus obtained may not be representative of the hydrogen bound during photosynthesis. A method for the removal of these hydroxyl hydrogen atoms through replacement with NO2 groups has thus been developed. This “nitration” process has been shown to be quantitative and no disturbance of the remaining hydrogen atoms through exchange reactions was detected. The direct nitration of the residual sugars in wine is also possible using this method as, when in the nitrated form, the sugars can be easily separated from the other components present. The reproducibility for the measurement of the 2H/1H ratios of the carbon bound hydrogen was 1.9‰
    Notes: Zusammenfassung Das 2H/1H-IsotopenverhÄltnis von Zuckern ist von deren Vorbehandlung abhÄngig, da die an Sauerstoff gebundenen Wasserstoffatome rasch und unkontrollierbar mit Wasser austauschen. Die von solchen Proben erhaltenen δD-Werte sind deshalb nicht reprÄsentativ für den D-Gehalt des bei der Photosynthese gebundenen Wasserstoffs. Mehrere Verfahren für die Substitution dieser Wasserstoffatome werden erprobt; als geeignet erweist sich die Herstellung der SalpetersÄureester der Zucker. Das entwickelte „Nitrierungsverfahren“ verlÄuft quantitativ, und bei den am Kohlenstoff gebundenen Wasserstoffatomen treten keine Austauschreaktionen auf. Die Anwendung für die direkte Nitrierung des Restzuckers in Wein erweist sich gleichzeitig als Möglichkeit, die Zucker leicht von den anderen Komponenten in einem Lyophilisat abzutrennen. Die Reproduzierbarkeit für die D-Bestimmung des an C gebundenen Wasserstoffs ist 1,9‰.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00466937
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  • 10
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    Analytic all-plus-helicity gluon amplitudes in QCD (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-12-20
    Description: Author(s): David C. Dunbar, John H. Godwin, Guy R. Jehu, and Warren B. Perkins We detail the calculation of two-loop all-plus-helicity amplitudes for pure Yang-Mills theory. The four-dimensional unitarity methods and augmented recursion techniques we have developed, together with a knowledge of the singular structure of the amplitudes, allow us to compute these in compact anal... [Phys. Rev. D 96, 116013] Published Tue Dec 19, 2017
    Keywords: Phenomenological aspects of field theory, general methods
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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