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Biomedical subjects

H Heinrich

Publications and source records attributed to H Heinrich.

82 records · Page 5Linked to original sources
PubMedDate not supplied

Quantitative characterisation of chemical inhomogeneities in Al-Ag using high-resolution Z-contrast STEM.

The incoherent imaging model is applied to interpret high-resolution Z-contrast micrographs. A simple method for a column-by-column resolved characterisation of Ag-rich precipitates in Al-Ag is developed. No information on the detailed imaging process is required. Evaluating the high-angle scattering intensities of Al and Ag by image analysis, the number of Ag atoms contained in individual atomic columns can be determined accurately and moreover, the thickness of the thin foil can be calculated. Multislice simulations confirm the broad validity of the incoherent imaging model for Z-contrast STEM and are used to check the method presented. Finally, the image analysis is applied to experimental Z-contrast images of Guinier-Preston zones in Al-3 at% Ag. The Ag content of the individual atomic columns can be determined with an accuracy better than +/-10%.

Journal Article↗
PubMedDate not supplied

Methylphenidate enhances both intracortical inhibition and facilitation in healthy adults.

Transcranial magnetic stimulation was used to investigate the effect of the psychostimulant drug methylphenidate (MPH) on motor cortex excitability in healthy adults (n = 12) in a placebo-controlled, crossover design study. MPH caused an enhancement of intracortical inhibition as well as intracortical facilitation. Enhancement of both of these TMS parameters was unexpected and suggests that MPH exerts its action on the motor cortex not only through the dopaminergic neurotransmitter system.

Adult↗
PubMedDate not supplied

[The redox status of the blood plasma in cattle from ecological farming--1. Influence of genotype and age on the antioxidant defence capacity in the blood plasma].

The present study examined the effects of race and age on the redox potential behavior of blood plasma samples. The oxidative stability was studied in the reaction with p-benzoquinone. The investigated animals represented three different cattle races (Limousin, Angus and Hereford), grazed on pasture. The blood samples from clinical healthy heifers (44) and calves (45) were investigated. The following parameters were determined: the start level of redox potential and the level after adding 10, 20, and 30 mg p-benzoquinone to the samples. The analyses of the redox potentials showed the advantage of oxidative stability of heifers compared with calves. The results showed a significant effect of race on the redox potential behavior of blood plasma.

Age Factors↗
PubMedDate not supplied

[Investigations of humoral and cellular regulation mechanisms of the redox-homeostasis in cattle from ecological farming--2. Influence of race and age on the enzymatic redox control in the blood plasma].

The present study examined the effects of race and age on the redox potential behavior of blood plasma samples. The blood plasma from clinical healthy heifers (44) and calves (45) were investigated. The animals presented three different cattle races (Limousin, Angus and Hereford), grazed on pasture. The blood plasma test consists of two parts: analysis of the initial redoxpotential as well as the investigation of the action of biocatalists. ATP, ATP plus caffeine, GTP and FAD+ were used as an adding substances for the differential analysis. The influence of biocatalist on the redox balance and the reaction of the redox dependent enzymatic system of native plasma significant correlated with animal race and age.

Age Factors↗