Studio portrait of Hans Bernkopf as a young man. Portraits Men

Digital Image

Studio portrait of Josef Molling with unidentified man; Heidelberg, Germany.

right: Joseph Molling sitting; left: unknown man standing

Studio portrait of Josef Molling with unidentified man; Heidelberg, Germany.

right: Joseph Molling sitting; left: unknown man standing

Portrait of Rudolph Gottschalk (Ralph Gramme) as a young man; Hannover, Germany.

Photograph taken shortly before he left Hannover for England on the Kindertransport, May 1938; other data show a January 1938 departure.

Studio portrait of Fritz Gottschalk as a young man; Hannover, Germany.

Digital Image

Albert Einstein with David Ben Gurion and unidentified man; Princeton, New Jersey Portraits; Groups; Men

Digital Image

Nutrient levels in experimental tanks supplied with prawn pond effluent: the effect of artificial substrate and different densities of the banana prawn Penaeus merguiensis (de Man)

To experimentally investigate the effect of vertical artificial substrate and different densities of the banana prawn Penaeus (Fenneropenaeus) merguiensis on nutrient levels in prawn pond effluent, a time series experiment was conducted in a replicated tank system supplied periodically with discharge from a prawn production pond. Few differences (P>0.05) were detected between tanks without prawns, and tanks with low densities (5 prawns in 1700 litres) of prawns (10-12 g), in terms of nitrogen and phosphorus in the water column over the 28-day experimental period. Higher densities of prawns (starting at 25 or 50 per tank) caused an elevation of these macronutrients in the water column. This was partly due to prawn biomass losses from mortalities and weight reductions in the tank system. The survival and condition of prawns was significantly (P<0.05) reduced in tanks at these higher densities. The presence of artificial substrate (2 m2 tank-1) did not affect (P>0.05) the levels of nutrients in tank water columns, but significantly (P<0.05) increased the amount of nitrogen in tank residues left at the end of the trial when no prawns were present. The prawns had obviously been grazing on surfaces inside the tanks, and their swimming actions appeared to keep light particulate matter in suspension. Higher prawn densities increased microalgal blooms, which presumably kept ammonia levels low, and it is suggested that this association may provide the means for improved remediation of prawn farm effluent in the future.

Hugo Steiner-Prag and unidentified man discussing blueprints; Leipzig.

Photographers imprint bottom left

Portrait of unidentified man Portraits Men

Digital Image

Unidentified man at the monument for the destroyed synagogue; Leipzig Synagogues

Digital Image

Portrait of unidentified man wearing medals and holding rifle, standing in front of shooting target Portraits Men

Digital Image

Unidentified women and man Portraits Family

Handwritten on verso: Jetzt sind wir wieder vergnuegt und gluecklich zusammen. Herzlichst Deine (Illegible name Neni or Leni?)

Portrait of (l-r) unidentified man, Thomas Mann, Singer (painter), Lion Feuchtwanger and unidentified man Portraits Groups Men

Digital Image

Studio portrait of Fritz Gottschalk as a young man; Hannover, Germany.

Digital Image

Studio portrait of Julius Krakauer as a young man; Landeshut (Kamienna Gora), Schlesia.

Digital Image