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Biomedical subjects

B Mayr

Publications and source records attributed to B Mayr.

186 records · Page 11Linked to original sources
PubMedDate not supplied

Comparison of CT with MR imaging of endobronchial tumors.

Twenty-nine patients suspected of having an endobronchial mass were examined by magnetic resonance (MR) and CT. Seventy-nine pathological and 319 normal bronchi were confirmed by bronchoscopy and/or operation in these patients. The studies were evaluated by two observers (A and B): By MR, only 72% (A) or 71% (B) of the pathological and 45% (A) or 43% (B) of the normal bronchi, respectively, were visualized. Computed tomography identified all pathological and 97% of the normal bronchi (A and B). Therefore, comparison between MR and CT was based only on those bronchi that were adequately visualized on MR as well as CT. For these bronchi the sensitivity of MR was 88% (A) or 77% (B) and of CT 96% (A) and 93% (B). Specificity was 92% (A) and 94% (B) for MR and 97% (A and B) for CT. At the present stage of development CT proved to be superior to MR in demonstrating endobronchial lesions.

Adenocarcinoma↗
PubMedDate not supplied

Multiple malformation of bovine spermatozoa with special reference to their lightmicroscopic fluorescing pattern and electron-microscopic structure.

The light microscopic examinations of sperm samples from a sterile Fleckvieh-bull stained by the AT specific fluorochrome Hoechst 33258 showed beneath the constantly occurring paraxial tail numerous other malformations, which appeared under the electron microscope as multiple defects of essential cell organelles: defects of the acrosome as irregular thickening or forming of overturned folds "knobbed acrosome", sometimes with vesicles and inclusions inside, partial separation of the acrosome lamina from the nucleus. The defects of the nucleus were present as double-headed sperms, macro- and microcephalic forms besides bizarre shaped heads with gigantic cavities, often filled with membranes, cytoplasm and canaliculi even as heads with ridges which extended from the base to the apex. The main tail defect was a paraxial inserted tail, sometimes coiled, folded or bent down and combined with duplication or even multiplication of the tail with one or two implantation fossae. This multiplication was followed by extensive disturbances of the tail elements as lack or excessive numbers up to the isolation of tubules, fibers and mitochondria. Often there was no contact between tail and implantation fossa. Another defect was the existence of voluminous cytoplasmic droplets covering not only great parts of the tail but also the total head which included "arch like double membranes" and up to 15 tail segments. The persisting cytoplasmic droplet even as the generally occurring paraxial inserted tail are discussed in connexion with the existing hormonal imbalance as probably genetic damage leading to extensive defects during spermiogenesis.

Acrosome↗
PubMedDate not supplied

Association patterns in cattle chromosomes.

An analysis of association patterns revealed breed-specific deviations from random distribution of the participating chromosomes. The investigation of the distribution of associations also showed several deviations from randomness. The strong involvement of a rearranged chromosome in associations is high-lighted.

Animals↗