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Biomedical subjects

F Pliquett

Publications and source records attributed to F Pliquett.

36 records · Page 2Linked to original sources
PubMed1976

[Examination of pork quality using passive electric methods].

Passive electrical values of 76 probes of pig M. long. dors. with different quality are derterminated. It appears, that a factor (P = value), exactly ascertained from electrical parameters, is fit to characterize the quality of pork. The P-value is theoretical established and has relations to the stability of the membrane structures.

Animals↗
PubMed1975

[Investigations of the autolysis of liver by passive electrical and thermodynamic statistical methods (author's transl)].

From continuous passive-electrical measurements on autolyzing liver tissue are derived statements about the structural changes in time. In the early post mortem phase the autolysis is a cell-controled process, which suddenly goes over in an uncontroled degradation process. The changes of the uncontroled process are fitted. The results are statistically and thermodynamically interpreted by a condensation modell. The high complexity of the living resp. cell-controled system correlates to a relatively high structural entropy.

Animals↗
PubMedDate not supplied

Evaluation of fast time-domain based impedance measurements on biological tissue.

Bio-impedance measurements are widely used for characterization of biological objects. Although the measured impedance of such objects is independent of the measurement method used, slight differences between measurements in the frequency and time domain are found. For many practical applications time domain based measurements are advantageous, but they are often rejected as not accurate. In order to show their suitability for bio-impedance measurements we used a special arrangement of time domain and frequency domain based measurements at the same biological specimen (canine liver) with the same electrodes. A reasonable coincidence in the measurement results could be shown. Moreover we used only a fraction of the time domain measurement data in order to demonstrate a significant reduction in measurement time while maintaining a reasonable accuracy. An algorithm for fast processing of the time domain data without transformation into the frequency domain is provided.

Animals↗
PubMedDate not supplied

[Effect of antioxidants on the psoralen photo-oxidation process].

Psoralens are capable of photosensitizing oxidation of unsaturated fatty acids due to the two-stage mechanism. During the first (light) stage psoralen solution in ethanol undergoes photooxidation under UV-irradiation (366 nm). At the second (dark) stage the addition of photooxidized psoralen (POP) to the aqueous solution of liposomes is followed by lipid oxidation. Antioxidants inhibited the UV-stage, but did not influence the dark one. Neither spectrophotometry, nor spectrofluorometry could detect photoproducts of psoralen involved in the two-stage oxidation of lipids. However, mixing of ethanol solution of POP with water resulted in the flash of chemiluminescence. The inhibition constants by antioxidants of photoproducts formation which are active in the two-stage oxidation of lipids were estimated by chemiluminescence. Stern--Volmer's constants for antioxidants: 2,6-dimethyl-3,5-diacetyl-1,4-dihydropyridine (DHP), 6-hydroxy-2,2,5,7,8-pentamethylchroman (chromanol--C1), water soluble sodium phenozan and butilated hydroxytoluen (ionol) appeared to be (7.4 +/- 2.2) X 10(3) M-1, (4.4 +/- 1.0) X 10(3) M-1, (3.3 +/- 0.7) X 10(3) M-1, (4.5 +/- 2.5) X 10(2) M-1, respectively. The biological importance of these two-stage oxidation photosensitized by furocoumarins is discussed.

Antioxidants↗