Portrait of Gertrud (Trude) Guttmann (on right) with unidentified woman Portraits Groups Women

Born September 8, 1905, worked in a Jewish orphanage in Berlin and was deported to Auschwitz May 17, 1943, where she died.

Erich Gustav Baum (on right) with undientified man (maybe his father-in-law David Dublon?) standing next to a narrow cobblestone street full of horse-drawn carriages Portraits Men

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Herman Sommerfeld (right) in military uniform with an unidentified soldier Portraits Men

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Herman Sommerfeld (fifth from right) with other soldier recruits; Döberitz, Germany Portraits Men

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Portrait of Herman Sommerfeld (right) with two unidentified pilots of the naval air force; Adlershof bei Berlin Portraits Men

Caption reads: Werftbild Abtl Flugzeugmeisterei Adlershof bei Berlin 1917

Young Herbert Strauss (far right) with three unidentified friends walking down a street on an excursion to Sulzfeld, Baden.

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CRC27012 A National Diagnostic Database for Emergency Plant Pests

Development of a national diagnostic database for Emergency Plant Pests which will be web-accessible.

Recognition And Top-Down Generation Of Beta-Acyclic Database Schemes

Database schemes can be viewed as hypergraphs with individual relation schemes corresponding to the edges of a hypergraph. Under this setting, a new class of "acyclic" database schemes was recently introduced and was shown to have a claim to a number of desirable properties. However, unlike the case of ordinary undirected graphs, there are several unequivalent notions of acyclicity of hypergraphs. Of special interest among these are agr-, beta-, and gamma-, degrees of acyclicity, each characterizing an equivalence class of desirable properties for database schemes, represented as hypergraphs. In this paper, two complementary approaches to designing beta-acyclic database schemes have been presented. For the first part, a new notion called "independent cycle" is introduced. Based on this, a criterion for beta-acyclicity is developed and is shown equivalent to the existing definitions of beta-acyclicity. From this and the concept of the dual of a hypergraph, an efficient algorithm for testing beta-acyclicity is developed. As for the second part, a procedure is evolved for top-down generation of beta-acyclic schemes and its correctness is established. Finally, extensions and applications of ideas are described.

Benno Strauss (far right) with unidentified family members.

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Aenny Catzenstein nee Gottschalk (right) with unidentified woman; Ascona, Switzerland.

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Arno Nadel (2nd from right) with undentified men listening to new recordings; Berlin Portraits; Groups; Men

Verso: "Listening to new recordings. Berlin 1932"

Portrait of the dancing school class of Therese Molling (second row third from right); Germany.

Mille Ottling ran the dancing school. Therese Molling's daughter Liesel (Elizabeth) Gottschalk and brother Hal attended the same school during the mid 1920s

Polymorphism and conformational flexibility of DNA: right and left handed duplexes

Left handed duplexes are shown to be in agreement with the X-ray intensity data of A-, B- and D-forms of DNA. The structures are stereochemically satisfactory because they were obtained following a stereochemical guideline derived from theory and single crystal structure data of nucleic acid components. The same stereochemical guideline also led to right handed duplexes for B- and D-forms of DNA which have stereochemically preferred conformation and hence are superior to those given by Arnott and coworkers.