1,723,912 research outputs found
AHC interview with Helma Goldmark.
No full textJune 3, 2008Helma Goldmark née Bluehweis was born in Graz, Austria in 1926. Her mother died in 1937. During 'Kristallnacht' members of the SA seriously injured her father, and soon after he and Helma emigrated to Zagreb, Croatia (then Yugoslavia). Her father got arrested by the Ustasche and was deported to Jasenovac, where he perished. Helma emigrated in 1942 to Italy and from there to the United States, where she arrived in July of 1947.Austrian Heritage Collectio
Helma Sanders / Raoul Sangla, réal. ; Jacques Dugowson, aut. ; Helma Sanders, participante
No full textRésumé : Découverte en France grâce à son film 'Allemagne, mère blafarde' Helma Sanders est une des réalisatrices les plus connues du jeune cinéma allemand. Elle nous parle ici de son amour pour la France, de l'amitié, de la vie à Berlin aujourd'hui, et du cinéma (source : Média Scérén)Durée : 00:09:19Thème : Ciném
Ausländische Pflegekräfte in deutschen Privathaushalten : ein Interview mit Prof. Dr. Helma Lutz
No full textHelma Lutz ist Professorin am Fachbereich Gesellschaftswissenschaften der Goethe-Universität Frankfurt am Main. Seit 15 Jahren beschäftigt sie sich in ihrer Forschung mit "neuen Dienstmädchen" – Migrantinnen, die Haus-, Erziehungs- und Versorgungsarbeit ("Care-Arbeit") in deutschen Haushalten verrichten. Die Redaktion von focus Migration hat sie zu diesem Thema befragt
Embroidered Baskets friendship quilt by Helma Robinson Lamorearix
No full textImage of Embroidered Baskets friendship quilt created in 1931 by Helma Robinson Lamorearix. Also includes questionnaires describing the quilt completed by Hilma Lamorearix as part of the Utah Quilt Guild\u27s documentation days held from 1988-1994. This quilt was park of my hope chest. I gave square of muslin to my friends to embroidery or Applique as the wished then mother helped me finish it. Each block has the name of the maker. This type of quilt was quite popular at that time in our area
Dihydrogen activation at non-metallic centers
No full textThe work presented in this thesis was dedicated to the development of novel systems based on pyridinium salts for the heterolytic dihydrogen activation and evaluation of their suitability as catalysts for catalytic hydrogenation. These systems contain a pyridinium salt as hydride acceptor and a basic nitrogen or oxygen function as proton acceptor. Initially, an intramolecular system was envisioned, in which the pyridinium salt is linked with a basic amine and the hydrogen cleavage should occur through a concerted transition state. Due to the low stability of the starting materials, mainly decomposition products were observed after test reactions at high temperatures and hydrogen pressures ranging from 50-100 bar.
As a next step, a bimolecular system based on pyridinium salts and sterically hindered alcoxides was evaluated. For this purpose, electrophilic N-acyl ammonium salts and phenolates derived from commercially available BHT derivatives were prepared. However, in the presence of hydrogen gas no reaction was observed and starting materials were recovered.
ITAMI and co-workers demonstrated the formation of pyridylidenes from pyridinium salts in the presence of a strong base. These highly reactive intermediates could then undergo formal addition of H2. Known pyridinium salt/dihydropyridine systems are Hantzsch esters and nicotinamide derivatives. Both classes of pyridinium salts were tested for H2 activation reactions. Although the formation of the corresponding dihydropyridines was observed, deuteration experiments proved that the reaction did not proceed via dihydrogen splitting. Furthermore, the ability of these N protected pyridinium salts to reduce selected substrates was rather poor.
Finally, the activation of dihydrogen was achieved by reaction of a pyridinium salt as described by ITAMI in the presence of base. First, a 1,3,5 triarylpyridinium salt was synthesized, which could be transformed into the corresponding pyridylidene in the presence of LiHMDS. This intermediate was trapped by quenching with S8. Reaction with H2 led to its activation and the corresponding 1,2 dihydropyridine was formed.
Dihydrogen activation was confirmed by reaction with deuterium gas, as the 2H NMR spectra showed the signal of the corresponding CD2 group. Studies towards catalytic applications of that system showed that imine 255 was reduced to the corresponding amine in the presence of stoichiometric amounts of base and 20 mol% of catalyst loading
Haas, Helma
No full textOral history interview with Helma Hass regarding her life in Tropic, Utah. Interview performed by Marsha Holland as part of the Utah State Historical Society Oral History Program
Unfolding presence: an interpretative phenomenological analysis of photography
No full textNote: This record first appeared under the author\u27s less commonly used primary name of Emma Helena Sawatzky. In order to match the information contained in the thesis itself, the name in the record has been changed to the author\u27s regular name of Helma Sawatzky
Data Quality in Predictive Toxicology: Identification of Chemical Structures and Calculation of Chemical Descriptors
No full textEvery technique for toxicity prediction and for the detection of structure–activity relationships relies on the accurate estimation and representation of chemical and toxicologic properties. In this paper we discuss the potential sources of errors associated with the identification of compounds, the representation of their structures, and the calculation of chemical descriptors. It is based on a case study where machine learning techniques were applied to data from noncongeneric compounds and a complex toxicologic end point (carcinogenicity). We propose methods applicable to the routine quality control of large chemical datasets, but our main intention is to raise awareness about this topic and to open a discussion about quality assurance in predictive toxicology. The accuracy and reproducibility of toxicity data will be reported in another paper
Een vrouw met twee missies. Reactie op Helma Lutz
No full textEen vrouw met twee missies. Reactie op Helma Lut
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