Untersuchungen zur Maillard-Reaktion XX. Nachweis von Glycerinaldehyd, Dihydroxyaceton und anderen hydrophilen Zuckerabbauprodukten in Caramellisierungsgemischen

Zusammenfassung Zuckerabbauprodukte lassen sich durch Umsetzung mit O-Methylhydroxylamin und anschließende Acetylierung zu gaschromatographisch gut trennbaren Verbindungen umsetzen. In Zucker-caramellisierungsgemischen konnten so Glycerinaldehyd, Dihydroxyaceton, Erythrose, 3-Deoxyhexosulose und Methylglyoxal nachgewiesen werden. Auch in der Kruste von Brezen entstehen Glycerinaldehyd und Dihydroxyaceton.

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Investigations relating to the maillard reaction XX. Identification of glyceraldehyd dihydroxyacetone and other hydrophilic sugar degradation products in caramel mixtures

Summary Sugar degradation products can be determined by g.l.c. after reaction with O-Methylhydroxylamine and subsequent acetylation. Thus dihydroxyacetone, glyceraldehyde, erythrose, 3-deoxyhexosulose and methylglyoxale have been detected in caramelisation mixtures. Dihydroxy-acetone and glyceraldehyde could also be identified in the crust of a special bakery product.

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XIX. Mitteilung: Ledl F, Hiebl J, Severin Th (1983) 177:353–355     

Case study: Treatment of herpes genitalis phobia and agoraphobia with panic attacks.

A 25-yr-old woman with incapacitating hypochondriasis (disease phobia and conviction of being infected with herpes genitalis) for 4 yrs and agoraphobia with panic attacks for 2 yrs was well after 6 mo of treatment and at 14-mo follow-up. Agoraphobia was treated with a combination of desensitization in imagery, aided by relaxation training using electromyogram (EMG) and skin temperature biofeedback, followed by exposure in vivo. Hypochondriasis was treated by psychotherapeutic techniques and presentation of medical facts. (20 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Accuracy of the finite element method near a curved boundary

Solutions of problems by the finite element method, when curved boundaries are present in the model, may not be accurate. Such a difficulty arises when straight-line elements are used to approximate the curved boundary. This behavior is known in the literature as the “Babuska Paradox”. Despite the fact that the problem has been recognized since the mid 60's, and methods to overcome it have been used quite successfully, many textbooks still ignore it. Here, this “paradox” is demonstrated by plane-stress problems, to which analytical results exist. One known method (the isoparametric element) is used to show how to overcome these difficulties.     

Bildung von Benzaldehyd aus Phenylalanin und N-Acetylphenyl?thylamin beim Erhitzen unter Einwirkung von Luft

Zusammenfassung Erhitzt man Phenylalanin, N-Acetylphenyläthylamin oder N-Glycyl-phenylalanin alleine oder mit Triglyzeriden in Gegenwart von Luft auf Temperaturen um 190–200° C, so wird Benzaldehyd gebildet.

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Formation of benzaldehyde from phenylalanine and phenylethylamine by heating under air blast

Summary Benzaldehyde is formed when phenylalanine, n-acetyl-phenylethylamine or n-glycyl-phenylalanine alone or with triglycerides in presence of air are heated to a temperature of nearly 190–200° C.

     

Microwave field-effect transistors from sulphur-implanted GaAs

Sulphur implanation into semi-insulating Cr doped GaAs has been used to fabricate MESFETs with 1.5 μm gatelength showing microwave gain equivalent to epitaxial FETs (MAG = 9 dB at 10 GHz) but higher noise. Room temperature implantation of S at an energy of 30 keV and a dose of 5 × 10¹² cm^?2, sputtered SiO₂ and Si₃N₄ as encapsulants and heat treatments from 820 to 900°C have been used. Electrical activation was found to depend critically on the substrate material. Si₃N₄-encapsulation gave slightly higher electrical activation than SiO₂.     

The cation distribution between five- and six-coordinated sites in some (Mg,Me)3(PO4)2) solid solutions

Approximate homogeneity ranges at about 1073 K have been determined for some (Mg,$\text{Me}$)₃(PO₄)₂ solid solutions. X-ray powder diffraction data are given and the observed changes in unit cell dimensions are discussed. The Mg₃(PO₄)₂ structure, isotypic with γ-Zn₃(PO₄)₂, contains five- and six-coordinated cation sites, M1 and M2 respectively. The M1 site preference order is Zn²⁺ > Co²⁺ > Fe²⁺ > Mg²⁺ > Mn²⁺.     

The metabolic effects of excess noradrenaline secretion from a pheochromocytoma

We report a 14-year-old boy with severe hypertension who was cured by surgical removal of a pheochromocytoma. The tumor was shown biochemically and morphologically to secrete predominantly noradrenaline. The metabolic effects noted in this patient were raised free fatty acid levels and depressed insulin levels, hyperreninemia, hypercalcemia, and hypercalciuria with normal parathyroid function. All these abnormalities returned to normal after removal of the tumor. It is suggested that these effects were mediated via beta-adrenergic stimulation of the excess noradrenaline.     

Industrielle Kristallisation – Moderne großtechnische Anlagen und Fallstudien

Industrial crystallization – Modern industrial plants and case studies . In the field of mass crystallization a number of advanced plant designs have been implemented in the past decade, and are exemplified in the crystallization of adipic acid and common salt, and in evaporation of aluminate liquor which is susceptible to encrustation. Assessment criteria are, inter alia, product qualities such as the purity achieved and the crystal size distribution, and operation parameters such as the duration of process flow and control behaviour. The significant increase in quality is largely attributable to the crystallizers, which have been optimized above all with regard to the crystal-size distribution and the duration of product flow.