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Biomedical subjects

F Kremer

Publications and source records attributed to F Kremer.

44 records · Page 3Linked to original sources
PubMed1978

[Limited diffusion of dye between choroid and retina during animal experiments after injection of fluorescein and rhodamin (author's transl)].

For contributing to the question of an existence of a diffusion of the unbound part of the fluorescein between choroid and retina in fluorescein angiography, on pigmented rats, after intravenous injection of Fluorescein sodium and Rhodamine B respectively, comparing observations were effectuated. Rhodamine B in its unbound form showed a distinct diffusion between choroid and retina and coloured all retinal layers in the late phases whereas in the case of the Fluorescein sodium, only a poor diffusion was observable. The similar spectral bands of the primary and secondary fluorescences render difficult the observation of the behaviour of the fluorescein dye.

Animals↗
PubMed1977

[Regression of corneal neovascularization by laser treatment? (author's transl)].

The corneal neovascularization produced by NaOH burns was examined in two groups of pigmented rabbits following laser treatment. The treatment was carried out with energy level 500 mW, spot diameter 200 micron, and exposure time 1 s throughout. In the first group, a single newly formed vessel was coagulated in each case. Subsequent fluorescein angiography invariably showed an incomplete occlusion of the vessel. In the second group, we coagulated a section of the neovascularization network at its origin in the corneal limbus. After 48 h, fluorescein perfusion was once again observed, but the vessels were predominantly finer than before. Fluorescence microscopy revealed a rich neovascularization of the more superficial layers of the corneal stroma. To be successful, laser treatment must involve both supplying and draining vessels.

Animals↗
PubMedDate not supplied

A non-thermal effect of millimeter wave radiation on the puffing of giant chromosomes.

A non-thermal influence of millimeter wave radiation (swept in frequency from 64.1 GHz to 69.1 GHz, sweeptime 6 s, and with stabilized frequencies of 67.200 +/- 0.001 GHz and 68.200 +/- 0.001 GHz, power density less than or equal to 6 mW/cm2) on the puffing of giant chromosomes of the midge Acricotopus lucidus (Diptera, Chironomidae) was found. The effect is manifested as a reduction in size of a specific puff that expresses genes for a secretory protein. The non-thermal nature of the effect was proved by experiments in which the sham-exposed sample was warmed up by 2.5 degrees C which is more than the eight-fold microwave induced temperature increase of less than or equal to 0.3 degrees C. Concerning the very low photon energy of mm-waves compared to the thermal energy kT, it seems likely that the coherence of the radiation is essential for the observed effect.

Animals↗