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Biomedical subjects

W Menke

Publications and source records attributed to W Menke.

At least 37 records · Page 2Linked to original sources
PubMed1983

[Fractures of the head of the tibia - an indication for CT?].

Experimental and clinical investigations of fractures of the head of the tibia by computed tomography are described. CT provides much information which is of significance for treatment. In particular, it demonstrates the size of fragments, of defects and areas of compression more clearly than does conventional radiography.

Adult↗
PubMed1982

[Computer tomography after medullary nailing of the tibia].

Computer tomographic examination of the tibia was carried out in ten patients two days to four years after removal of an intramedullary nail. Sclerosis of the marrow cavity and cortex and bone formation in the nail track are characteristic findings. They have been correlated with the appearances on conventional x-rays. Changes in the density of the marrow cavity, which is normally increased around the previous nail tract, do not necessarily indicate the presence of infection. In the absence of complications, the increased marrow space density may return to normal negative values corresponding with fat density.

Adult↗
PubMed1976

Cyclic Photophosphorylation in the Mykotrophic Orhid Neottia nidus-avis.

The mykotrophic orchid Neottia nidus-avis (L.) Rich. is not able to evolve oxygen in the light. Plastid preparations from the lip (labellum) of the orchid perform a photosystem I-dependent photoreduction of methylviologen with the artificial electron donor couple 2,6-dichlorophenol indophenol ascorbate. Photosystem II reactions such as the ferricyanide Hill reaction or the photoreduction of 2,6-dichlorophenol indophenol with diphenylcarbazide as the electron donor are not functioning. The plastids exhibit phenazine methosulfate-mediated cyclic photophosphorylation. After infiltration with (32)P-labeled phosphate the labellum forms (32)P-ATP in the light. This rate of ATP formation is enhanced by additional infiltration of phenazine methosulfate prior to illumination. The brown color of the plant is caused by an absorption shift of carotenoids to longer wavelength. By comparison of absorption spectra with the fluorescence excitation spectra of plastid preparations and of the extracted pigments we show that no appreciable energy transfer from carotenoids to chlorophyll occurs.

Journal Article↗
PubMed1974

Small angle x-ray scattering of the thylakoid membranes of Rhodopseudomonas speroides in aqueous suspensions.

The diffraction patterns of particles which have the shape of hollow spheres, i.e. vesicles, can be satisfactorily analyzed by means of a new formula of Weick (1974). This formula is used for the small angle X-ray scattering analysis of aqueous suspensions of thylakoids of Rhodopseudomonas spheroides. Some essential results are: (a) The membrane has a rather asymmetric structure with one layer of low electron density at its inner side and two layers of high electron density near the outer surface of the thylakoids. (b) The distance of the electron density maxima of the latter two layers is 45 +/- 5 A. (c) Between the two maxima is a region of an electron density nearly equal to that of water. (d) The sequence of the peaks is - + 0 + with increasing radius. The peaks extend over an interval of 120 +/- 10 A. (e) The thylakoids are strikingly of the same size. Their diameters, if defined by the outmost layer, vary statistically by about 4% and have an average value of approximately 640 A.

Mathematics↗