Carl F. Berger

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Ten strains of Geotrichum candidum were studied on a liquid cheese model medium for the production of sulfur compounds which contribute to the aroma of cheeses. The volatile components produced by each cultured strain were extracted by dynamic headspace extractions, separated and quantified by gas chromatography (GC), and identified by GC-mass spectrometry.(More)
The microorganisms involved in cheese ripening produce various volatile compounds and induce typical flavors that contribute to cheese variety. To investigate aroma compound generation of cheese microflora, we used a dynamic headspace-gas chromatography-mass spectrometry analysis. To obtain good sensitivity and repeatability of quantification, dynamic(More)
We have investigated the capacities of Geotrichum candidum strains to produce sulphides from methionine. This attribute is very important in cheese technology because of the flavouring potential of sulphur compounds. A spectrophotometric procedure using 5,5'-dithiobis(2-nitrobenzoic acid) to determine sulphides was tested on a collection of G. candidum(More)
Urbanization is arguably the most dramatic form of highly irreversible land transformation. While urbanization is a worldwide phenomenon, it is exceptionally dynamic in India, where unprecedented urban growth rates have occurred over the last 30 years. In this uncontrolled explosive situation city planning lacks of data and information to measure, monitor,(More)
The odor characteristics of individual components present in a library comprised of S-methyl thioesters were determined independently by two laboratories using similar but not identical techniques. The odor potency was assessed by values of best estimate-GC-lower amount detected by sniffing (BE-GC-LOADS). For small and medium chain S-methyl thioesters,(More)
A new method for the "one-pot" synthesis of S-methyl thioesters has been developed by reacting methyl chlorothiolformate with carboxylic acids. The resulting "flavor library" contained all the intended thioesters and a single major impurity, identified by GC-MS as S, S-dimethyldithiocarbonate. Quantification of individual compounds present in the library(More)
OBJECTIVE User data and information about anatomy education were used to guide development of a learning environment that is efficient and effective. The research question focused on how to design instructional software suitable for the educational goals of different groups of users of the Visible Human data set. The ultimate goal of the study was to(More)
In fuel cell technology, simplicity of form and construction a r e desired engineering features. uniform porosity to insure a n even distribution of gas. imperfections cause gas accumulation in the electrolyte and mixing of gases when slight gas pressure difference occurs. In addition sintered metal electrodes a r e fragile and porous carbon electrodes a r(More)
thought is lost. Papert also proposes that this type of exploration encourages students to evaluate their work in a new way; they begin to look at their attempts in terms of what needs to be done to make them work, as opposed to the fact that they are wrong. It is hoped that these debugging strategies, and many other cognitive skills, will be transferred to(More)
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