Some pyrazine derivatives from the Argentine ant, Iridomyrmex humilis

1974 ◽  
Vol 27 (4) ◽  
pp. 879 ◽  
Author(s):  
GWK Cavill ◽  
E Houghton
Keyword(s):  
Body Weight ◽  
Mass Spectrometric ◽  
The Body ◽  
Argentine Ant ◽  
Mass Spectrometric Data ◽  
Spectrometric Data ◽  
Iridomyrmex Humilis

3-Isopentyl-2,5-dimethyl-, and the (Z)- and (E)-isomers of 2,5-dimethyl-3-styryl-pyrazine, have been fully characterized from the Argentine ant, I. humilis. A facile conversion of the (E)- into the (Z)-styryl derivative is noted. These pyrazines comprise 70 and 200 p.p.m, of the body weight of the insect. Mass spectrometric data suggests a further pyrazine, the 2,5-dimethyl-3-propyl derivative, is present at approximately 5 p.p.m.

Hydrocarbon constituents of the Argentine ant, Iridomyrmex humilis

1973 ◽  
Vol 26 (5) ◽  
pp. 1131 ◽  
Author(s):  
GWK Cavill ◽  
E Houghton
Keyword(s):  
Body Weight ◽  
The Body ◽  
Argentine Ant ◽  
Normal Alkanes ◽  
Iridomyrmex Humilis

The 26 hydrocarbons identified from Iridomyrmex humilis comprise 0.24% of the body weight of the insect. They include the normal alkanes, C14 to C27, and a number of alkenes and 3- and 5-monomethylalkanes in the range C14 to C20. The presence of 4-methylhexadecane is noted. Two of the constituents, heptadecane and (Z)-nonadec-9-ene, comprise 80% of the total.

Application of Factor Analysis in Imaging Mass Spectrometric Data Analysis

2014 ◽  
Vol 42 (8) ◽  
pp. 1099-1103 ◽  
Author(s):  
Yi CHEN ◽  
Fei TANG ◽  
Tie-Gang LI ◽  
Jiu-Ming HE ◽  
Zeper ABLIZ ◽  
...  
Keyword(s):  
Factor Analysis ◽  
Data Analysis ◽  
Mass Spectrometric ◽  
Mass Spectrometric Data ◽  
Spectrometric Data

scholarly journals Constructing a data-driven receptor model for organic and inorganic aerosol – a synthesis analysis of eight mass spectrometric data sets from a boreal forest site

2019 ◽  
Vol 19 (6) ◽  
pp. 3645-3672 ◽  
Author(s):  
Mikko Äijälä ◽  
Kaspar R. Daellenbach ◽  
Francesco Canonaco ◽  
Liine Heikkinen ◽  
Heikki Junninen ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Organic Aerosol ◽  
Mass Spectrometric ◽  
Chemical Components ◽  
Forest Site ◽  
Aerosol Composition ◽  
Mass Spectrometric Data ◽  
Spectrometric Data ◽  
Aerosol Mass ◽  
Inorganic Aerosol

Abstract. The interactions between organic and inorganic aerosol chemical components are integral to understanding and modelling climate and health-relevant aerosol physicochemical properties, such as volatility, hygroscopicity, light scattering and toxicity. This study presents a synthesis analysis for eight data sets, of non-refractory aerosol composition, measured at a boreal forest site. The measurements, performed with an aerosol mass spectrometer, cover in total around 9 months over the course of 3 years. In our statistical analysis, we use the complete organic and inorganic unit-resolution mass spectra, as opposed to the more common approach of only including the organic fraction. The analysis is based on iterative, combined use of (1) data reduction, (2) classification and (3) scaling tools, producing a data-driven chemical mass balance type of model capable of describing site-specific aerosol composition. The receptor model we constructed was able to explain 83±8 % of variation in data, which increased to 96±3 % when signals from low signal-to-noise variables were not considered. The resulting interpretation of an extensive set of aerosol mass spectrometric data infers seven distinct aerosol chemical components for a rural boreal forest site: ammonium sulfate (35±7 % of mass), low and semi-volatile oxidised organic aerosols (27±8 % and 12±7 %), biomass burning organic aerosol (11±7 %), a nitrate-containing organic aerosol type (7±2 %), ammonium nitrate (5±2 %), and hydrocarbon-like organic aerosol (3±1 %). Some of the additionally observed, rare outlier aerosol types likely emerge due to surface ionisation effects and likely represent amine compounds from an unknown source and alkaline metals from emissions of a nearby district heating plant. Compared to traditional, ion-balance-based inorganics apportionment schemes for aerosol mass spectrometer data, our statistics-based method provides an improved, more robust approach, yielding readily useful information for the modelling of submicron atmospheric aerosols physical and chemical properties. The results also shed light on the division between organic and inorganic aerosol types and dynamics of salt formation in aerosol. Equally importantly, the combined methodology exemplifies an iterative analysis, using consequent analysis steps by a combination of statistical methods. Such an approach offers new ways to home in on physicochemically sensible solutions with minimal need for a priori information or analyst interference. We therefore suggest that similar statistics-based approaches offer significant potential for un- or semi-supervised machine-learning applications in future analyses of aerosol mass spectrometric data.

scholarly journals Lecythomycin, a New Macrolactone Glycoside from the Endophytic Fungus Lecythophora sp

2011 ◽  
Vol 6 (5) ◽  
pp. 1934578X1100600 ◽  
Author(s):  
Noor Erma Sugijanto ◽  
Arnulf Diesel ◽  
Mostafa Rateb ◽  
Alexander Pretsch ◽  
Selma Gogalic ◽  
...  
Keyword(s):  
Antifungal Activity ◽  
Aspergillus Fumigatus ◽  
Endophytic Fungus ◽  
Mass Spectrometric ◽  
Mass Spectrometric Data ◽  
Minimal Inhibitory Concentrations ◽  
Spectrometric Data ◽  
Isolated Compound

A new macrolactone glycoside, lecythomycin (1), 23-methyl-3-(1- O-mannosyl)-oxacyclotetracosan-1-one, was isolated from the endophytic fungus Lecythophora sp. (code 30.1), an endopyte of the Indonesian plant Alyxia reinwardtii. The structure of 1 was elucidated on the basis of NMR spectroscopic and mass spectrometric data. The isolated compound displayed antifungal activity against strains of Aspergillus fumigatus and Candida kruzei at minimal inhibitory concentrations (MIC) of 62.5 – 125 μg/mL.

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