Henriette Gottschalk nee Rothschild with her grandson Franz Catzenstein at the dining table in her garden.

Digital Image

Strategies for collecting screen-less oscillation data

Screen-less oscillation photography is the method of choice for recording three-dimensional X-ray diffraction data for crystals of biological macromolecules. The geometry of an oscillation camera is extremely simple. However, the manner in which the reciprocal lattice is recorded in any experiment is fairly complex. This depends on the Laue symmetry of the reciprocal lattice, the lattice type, the orientation of the crystal on the camera and to a lesser extent on the unit-cell dimensions. Exploring the relative efficiency of collecting X-ray diffraction data for different crystal orientations prior to data collection might reduce the number of films required to record most of the unique data and the consequent amount of time required for processing these films. Here algorithms are presented suitable for this purpose and results are reported for the 11 Laue groups, different lattice types and crystal orientations often employed in data collection.

Oscillation criteria for differential equations of second order

In this article, we give sufficient condition in the form of integral inequalities to establish the oscillatory nature of non linear homogeneous differential equations of the form where r, q, p, f and g are given data. We do this by separating the two cases f is monotonous and non monotonous.

Studio portrait of Franz Matthiesen; London Portraits Men

Digital Image

Portrait of Franz Matthiesen; London Portraits Men

Digital Image

Portrait of Franz Catzenstein with his uncle Ernst Gottschalk.

Digital Image

Portrait of Franz Catzenstein and his little sister Ellen. Portraits Children

Digital Image

Portrait of Aenny Catzenstein nee Gottschalk holding her infant son Franz Portraits Family

Digital Image

Portrait of Franz Matthiesen.

Digital Image

Studio portrait of Franz Matthiesen Portraits Men

Digital Image

Franz Matthiesen outdoors with his second wife Katherina Früh outside of Franz's Carton Hill home; London.

Digital Image

Franz Matthiesen and his mother Aenny Catzenstein nee Gottschalk; Oslo Court, London.

At the time Franz was ill with cancer but Aenny did not know.

Impacts of El Niño southern oscillation and Indian Ocean dipole on dengue incidence in Bangladesh

Dengue dynamics are driven by complex interactions between hosts, vectors and viruses that are influenced by environmental and climatic factors. Several studies examined the role of El Niño Southern Oscillation (ENSO) in dengue incidence. However, the role of Indian Ocean Dipole (IOD), a coupled ocean atmosphere phenomenon in the Indian Ocean, which controls the summer monsoon rainfall in the Indian region, remains unexplored. Here, we examined the effects of ENSO and IOD on dengue incidence in Bangladesh. According to the wavelet coherence analysis, there was a very weak association between ENSO, IOD and dengue incidence, but a highly significant coherence between dengue incidence and local climate variables (temperature and rainfall). However, a distributed lag nonlinear model (DLNM) revealed that the association between dengue incidence and ENSO or IOD were comparatively stronger after adjustment for local climate variables, seasonality and trend. The estimated effects were nonlinear for both ENSO and IOD with higher relative risks at higher ENSO and IOD. The weak association between ENSO, IOD and dengue incidence might be driven by the stronger effects of local climate variables such as temperature and rainfall. Further research is required to disentangle these effects.

Portrait of Franz Trolldenier; Employee of Mendelssohn Bank, Berlin Portraits Men

"11.4.1889 Franz Trolldenier geb. 5.12.1866"