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  • 1
    Electronic Resource
    Electronic Resource
    Neoflavonoid and Biflavonoid Constituents of Calophyllum inophylloide (1992)
    s.l. : American Chemical Society
    Journal of natural products 55 (1992), S. 1415-1420 
    Details
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/np50088a005
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  • 2
    Electronic Resource
    Electronic Resource
    K-region oxides and related oxidized metabolites of carcinogenic aromatic hydrocarbons (1975)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 97 (1975), S. 3468-3479 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00845a032
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  • 3
    Electronic Resource
    Electronic Resource
    Mechanism of reduction of trityl halides by lithium dialkylamide bases (1990)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 112 (1990), S. 5186-5193 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00169a029
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  • 4
    Electronic Resource
    Electronic Resource
    A versatile atomic-absorption spectrometric micro-attachment for cold-vapour atomic and gas-phase ultraviolet absorptiometric measurements (1981)
    Springer
    Microchimica acta 75 (1981), S. 99-106 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Anwendbarkeit eines kürzlich entwickelten Gerätes für die gewöhnliche Atomabsorptionsspektrometrie wurde erweitert sowohl für die Messung der Kaltdampf-Atomabsorption wie für die Messung der UV-Absorption in der Gasphase. Erstere wurde zur Bestimmung des Gesamtquecksilbers in menschlichem Gesamtblut und in Haarproben nach deren Homogenisierung in stark alkalischem Medium und Verwendung einer Mischung von SnCl2 und CdCl2 als Reduktionsmittel herangezogen. Auch die Anwendung des Gerätes für die Bestimmung flüchtiger Stoffe in wäßriger Lösung durch UV-Absorptions-Spektrophotometrie wurde geprüft, wobei Ammoniak als Modellsubstanz diente. Dieses einfache, empfindliche und selektive Verfahren eignet sich zur Bestimmung von ammoniakalischem und von Gesamtstickstoff in wäßrigen Proben. Die Ergebnisse sind mit denen der Standard-Destillation-Titration vergleichbar.
    Notes: Summary The applicability of a recently developed micro-attachment adaptable to common atomic-absorption spectrometers has been extended to include both cold-vapour atomic-absorption and gas-phase ultraviolet-absorption measurements. The cold-vapour atomic-absorption technique for the determination of total mercury in human whole blood and hair samples was applied by homogenizing the samples in a strongly alkaline medium and using stannous chloride-cadmium chloride mixture as reducing agent. Application of the system to the determination of volatile molecular species in aqueous solution by gas-phase ultraviolet-absorption spectrophotometry have also been studied, with NH3 as a model. This technique provides a simple, sensitive, yet selective method for the determination of ammoniacal and total nitrogen in aqueous samples and gives results comparable to those obtained by the standard distillation-titration method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01198709
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  • 5
    Electronic Resource
    Electronic Resource
    Gas chromatography—mass spectrometry analysis of termite defence secretions in the subfamilyNasutitermitinae (1982)
    Springer
    Microchimica acta 77 (1982), S. 219-229 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mono- und Diterpenderivate in den Sekreten verschiedenerNasutitermitinae-Soldaten wurden mit Hilfe der Gaschromatographie-Massenspektro-metrie charakterisiert. Verteilungsmuster der Monoterpene sind nützlich, aber für chemotaxonomische Zwecke ohne Bestimmung der Diterpen-Verteilung nicht ausreichend. Diterpenabkömmlinge sind in struktureller Hinsicht komplex und haben tetracyklische, tricyklische und bicyklische Strukturen mit wechselndem Sauerstoffgehalt. Die relativen Retentionsindices für einzelne identifizierte Diterpenabkömmlinge wurden auf OV-1- und OV-17-Säulen bestimmt. Menge und Verteilung der Terpenabkömmlinge sind nützliche Hilfsmittel für die Chemotaxonomie der genannten Termiten.
    Notes: Summary Mono- and diterpenoid components of severalNasutitermitinae soldier secretions have been characterised by gas chromatographymass spectrometry. Patterns in monoterpene distribution are useful, but not sufficient for chemotaxonomic purposes without determination of the diterpene distribution. Diterpenoids are structurally complex and can have tetracyclic, tricyclic and bicyclic skeletal structures with various degrees of oxygenation. The relative retention indices for several identified diterpenoid compounds have been determined on OV-1 and OV-17 columns. The amount and distribution of the terpenoid components are useful aids to chemotaxonomy forNasutitermitinae termites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01237810
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  • 6
    Electronic Resource
    Electronic Resource
    Environmental effects on growth and biochemical composition ofNitzschia inconspicua Grunow (1996)
    Springer
    Journal of applied phycology 8 (1996), S. 389-396 
    Details
    ISSN: 1573-5176
    Keywords: Nitzschia inconspicua ; diatoms ; lipids ; fatty acids ; eicosapentaenoic acid ; silicate ; nitrogen ; carbon source
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of nitrate and silicate levels, and carbon source on growth, biochemical composition and fatty acid composition ofNitzschia inconspicua were investigated using batch cultures. Within the range of silicate levels supplied (8.8–176 μM), no marked variations in growth trend, biochemical composition or fatty acid composition were shown. Biomass at stationary phase, ranging from 64–66 mg ash-free dry weight (AFDW) L−1, and specific growth rate (μ) based on chlorophylla (0.41–0.50 d−1) of the cultures grown within 0.3–3.0 mM NaNO3 were not significantly different. Cultures supplemented with glucose (0.1 % w/v), acetate (0.1 % w/v) or 5% CO2 attained higher biomass (85, 85, 97 mg AFDW L−1) than the control which was grown in synthetic seawater and agitated by magnetic stirring. Cells grown at 〈3.0 mM NaNO3 contained higher carbohydrate contents (14.8–21.5% AFDW) than those grown at 3.0 mM (4.0% AFDW). Lipid content increased at the expense of proteins in cells aerated with 5% CO2. The dominant fatty acids, 16:0 and 16:1, ranged from 35.7–45.0% and 36.4–45.4% total fatty acids (TFA), respectively, while the relative proportions of 20:4 (n-6) and 20:5 (n-3) ranged from 1.7–5.4% and 3.4–5.9% TFA respectively. Cultures aerated with 5% CO2 attained the highest biomass (97 mg AFDW L−1) and yield of 20:5 (n-3) (0.34 mg L−1).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02178582
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of carbon source on growth, biochemical composition and pigmentation of Ankistrodesmus convolutus (1995)
    Springer
    Journal of applied phycology 7 (1995), S. 59-64 
    Details
    ISSN: 1573-5176
    Keywords: Ankistrodesmus convolutus ; carbon source ; glucose ; fatty acids ; carotenoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The unicellular chlorophyte Ankistrodesmus convolutus Corda was grown in the light using inorganic medium (Bold's Basal Medium, BBM) and BBM enriched with 0.1% w/v of glucose, sodium acetate, sodium citrate or sodium bicarbonate. Glucose supported the highest specific growth rate (µ = 0.93 d-1) and gave the highest biomass (453 mg dry weight L-1) at the time of harvest. Of four glucose concentrations (0.05, 0.1, 0.25, 0.5% w/v), best growth was attained at 0.1% w/v. At 0.5% w/v glucose, the cells had high carbohydrates but low lipids and proteins. The relative amounts of 16:0, 18:0, 18:1 and 18:2 increased at the expense of 18:3(n-3) in the carbon-supplemented cultures and at glucose concentrations higher than 0.1% w/v. Cultures grown on glucose had less chlorophyll and carotenoid contents than cultures grown on other carbon sources. Chlorophyll and carotenoid contents decreased with increasing glucose concentrations in the medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00003551
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on the production of useful chemicals, especially fatty acids in the marine diatom Nitzschia conspicua Grunow (1994)
    Springer
    Hydrobiologia 285 (1994), S. 33-40 
    Details
    ISSN: 1573-5117
    Keywords: lipids ; fatty acids ; carbohydrates ; proteins ; culture age ; Nitzschia conspicua
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A local marine diatom, Nitzschia conspicua Grunow, was cultured in enriched synthetic seawater using flasks (agitated by magnetic stirring) and a 1.2 l fermenter. Lipids, fatty acids, proteins, carbohydrates and ash of the flask cultures were determined at various stages of growth (day 3, 5, 7, 10, 13, 15 and 17). The fermenter culture was harvested during the stationary phase for similar chemical analyses. N. conspicua attained a higher biomass concentration during the stationary phase when cultured in the fermenter (188 mg dry weight l−1) than in flasks (140–151 mg dry weight l−1). However, both systems showed similar specific growth rates based on chlorophyll-a concentration. Appreciable amounts of the essential fatty acids 20:4 (0.6–4.7% total fatty acids) and 20:5 (1.9–4.7% total fatty acids) are present in this diatom. Maximal amounts of these fatty acids were produced after 7 days' growth (i.e. 2 days after the end of the exponential phase). Lipids, fatty acids, proteins, carbohydrates and ash varied with culture age in N. conspicua.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00005651
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  • 9
    Electronic Resource
    Electronic Resource
    Minor Coumarins from Calophyllum teysmannii var. inophylloide and Synthesis of Cytotoxic Calanone Derivatives (1998)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 81 (1998), S. 1404-1416 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Chemotaxonomic survey for biologically active compounds from Malaysian Calophyllum species led to the findings of the four new benzoylcoumarins 1a, 2, 3, and 4a (including the unusual prenylated 6-benzoylcoumann 1a), two uncommon coumarins 5 and 6a with a pyran-4-one moiety fused at C(6) and C(7), and compounds 7a, 9, and 10, all isolated from the bark of C. teysmannii var. inophylloide. Their structures were determined by spectroscopic analysis and chemical transformations. X-Ray crystal-structure determination of 2 provided information on the conformational preferences of substituents in this class of coumarins. The syntheses of the cytotoxic calanone (7a) and of some related coumarins are described.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19980810549
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