Detail of tombstone of Arthur Molling; Strangriede Cemetery (R 26.05); Hannover Cemeteries Tombs

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Tombstones of Sophie Molling and Max Molling (center in shadow); Strangriede Cemetery (R 29.09 and R 29.10); Hannover Cemeteries Tombs

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Tombstones of Joseph Benjamin and Marianne Benjamin nee Sussmann; Strangriede Cemetery (R 83.8 and R 83.9); Hannover Cemeteries Tombs

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Tombstones of Lea Benjamin nee Levy and Herz Benjamin; Strangriede Cemetery (R 83.11 and R 83.12); Hannover Cemeteries Tombs

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Adolpf Molling, Janet Krakauer nee McColl, Hymie Joachim and Thomas Krakauer (l-r); Weggis, Switzerland Portraits Groups

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Tombstone of Joseph Benjamin; Strangriede Cemetery (R 83.8); Hannover Cemeteries Tombs

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Hydrogen bonding with mono- and di-carbonyls

The electronic absorption and i.r. spectroscopic studies are reported for the hydrogen bonding systems involving alcohol and various ketones. It is shown that the hydrogen bonding abilities of ketones are determined by the extent of delocalization of the lone pair electrons in their non-bonding molecular orbitals. Evidence for the formation of very weak intermolecular hydrogen bonds between alcohol and the π-electron part of the dicarbonyls has also been presented from the i.r. studies in the 3400–3700 cm−1 region.

Tombstone of Sophie Molling nee Benjamin; Strangriede Cemetery (R 20.09); Hannover Cemeteries Tombs

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Tombstone of Lea Benjamin nee Levy; Strangriede Cemetery (R 83.11); Hannover Cemeteries Tombs

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Hydrophobic channels in crystals of an alpha-aminoisobutyric acid pentapeptide

The crystal structure of the pentapeptide p-toluene-sulfonyl-(α-aminoisobutyryl)5-methyl ester (Tosyl-(Aib)5-OMe) has been determined in the space group PImage . Pentapeptide molecules are folded in the 310 helical conformation and packed together, so as to yield a hydrophobic channel with a minimim diameter of 5.2 �. The channel contains crystallographically disordered material. This structure provides a model for channel formation by hydrophobic peptide aggregates and should prove useful in studies of alamethicin, suzukacillin and related Aib containing membrane channels. Triclinic (PImage ) crystals of the pentapeptide are obtained in the presence of LiClO4 in aqueous methanol, whereas crystallization from methanol alone yields crystals in the space group Pbca. The conformations of the peptide in the two crystal forms are very similar and only the molecular packing is dramatically different.

Family portrait of (back l-r) Frieda Arens, Fritz Unger, Gustav Arens, Grete Glasner, (front l-r) Lise Arens, Gitta Unger and Ernst Glasner.

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Studio portrait of infant twins Beatrice and Fred Herz (l-r).

The Herz twins were born 4 February 1913