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Biomedical subjects

W Keil

Publications and source records attributed to W Keil.

At least 37 records · Page 2Linked to original sources
PubMed1991

[Subendocardial hemorrhage from the forensic medicine viewpoint].

The histological examination of cardial tissue samples concerning routine autopsy casework showed microscopic discrepancies in case of macroscopically found "subendocardial haemorrhages". In an attempt to analyse this phenomenon we compared the macroscopic and microscopic findings in 175 samples of endocardium from tissues presenting such haemorrhages of varying intensity: Only 8.6% showed a histological correlate and therefore could be verified as true haemorrhage. 53.7% presented mere hyperaemia and the remaining 37.7% even showed no microscopic finding at all. A satisfactory reason for this phenomenon could not be given by this investigation: The histological findings, however, do not depend on their cardial localization nor do they differ in relation to the cause of death or due to resuscitative actions. A possible cause of the described discrepancies may be a loss of haemoglobin of the erythrocytes. The results of this investigation point out that it might be necessary to reconsider the use of the term "subendocardial haemorrhage".

Cause of Death↗
PubMed1990

A behavioral bioassay for analysis of rabbit nipple-search pheromone.

To suckle, newborn rabbits are completely dependent on a pheromone present on the doe's ventrum and also apparently contained in the milk. Pups presented in a standardized test with 30 microliters of fresh rabbit milk on a glass rod reacted with vigorous search-like movements in 93%, and with grasping of the rod in 70% of trials, but did not respond to control presentations of other odorants. The pups were found to be most reactive 1-3 hours before the once daily nursing, and although they rapidly habituated to repeated testing, a break of 30 minutes was sufficient for the recovery of responsiveness. Even milk diluted by as much as 1:10(4) elicited significantly more responses than control substances. However, when left at room temperature it lost this behavior-releasing quality within about 20 minutes, but retained it for several months when stored at -40 degrees C. Rabbit milk thus appears to represent a ready source of nipple-search pheromone, and the behavioral response of pups to be reliable enough to serve as a bioassay for further pheromonal analysis.

Aging↗
PubMed1989

[Traumatic, ischemic and toxic rhabdomyolysis].

Rhabdomyolysis with myoglobinuria and acute renal failure can develop from a variety of traumatic and nontraumatic reasons and the clinical as well as forensic significance of it may vary from an epiphenomenon with an excellent prognosis to the cause of death. We present altogether four autopsy cases in two of which the rhabdomyolysis was associated with an acute intoxication with alcohol (male, 41 years of age) or amitriptyline in combination with chlordiazepoxide (male, 52 years of age). In both these subjects the myoglobinuria was a secondary finding and not the cause of death. In the other two subjects the outcome of rhabdomyolysis associated myoglobinuria was lethal. In the first one (female, 18 years of age) the muscle injury was traumatic, caused by long-lasting compression and ischaemia of the lower limbs (classical crush-syndrome), the outcome of which in spite of the adequate therapy was lethal. In the other one (male, 20 years of age) the rhabdomyolytic myoglobinuria and subsequent acute renal failure occurred postoperatively after reconstructive surgery of one hand and the interruption of blood circulation to the corresponding arm for the time of a nerve reconstruction. The recovery of the patient was complicated by continuing electrolyte disturbances associated with metastatic tissue calcification, especially of the lungs, leading to progressive respiratory insufficiency and eventually to death.

Adolescent↗
PubMed1989

Epitope mapping by deletion mutants and chimeras of two vesicular stomatitis virus glycoprotein genes expressed by a vaccinia virus vector.

Deletion mutants and chimeras of the glycoprotein (G) genes of vesicular stomatitis virus serotypes Indiana (VSV-Ind) and New Jersey (VSV-NJ) were cloned in plasmids and vaccinia virus vectors under control of the bacteriophage T7 polymerase promoter for expression in CV-1 cells co-infected with a T7 polymerase-expressing vaccinia virus recombinant. Truncated and chimeric G proteins expressed by these vectors were tested for their capacity to react with VSV-Ind and VSV-NJ epitope-specific monoclonal antibodies (MAbs) by Western blot analysis for those antigenic determinants not affected by disulfide-bond reducing conditions or by immuno dotblot analysis for those that are. These experiments allowed us to create putative epitope maps for glycoproteins of both serotypes based on binding affinity and cross-reactivity of VSV-Ind and VSV-NJ MAbs for truncated or chimeric G proteins of known amino acid sequences. Seven of the 9 VSV-NJ G epitopes, including all 4 epitopes involved in virus neutralization by MAbs, mapped to the center (amino acid sequence 193-289) of the 517 amino acid VSV-NJ G protein. Four of the 11 VSV-Ind G epitopes, including 2 neutralizable epitopes, mapped to the cysteine-rich amino-terminal domain (amino acid sequence 80-183) of the 511 amino acid VSV-Ind G protein; the remaining 7 VSV-Ind G epitopes, including 2 involved in virus neutralization, were clustered in the cysteine-poor carboxy-terminal domain (amino acid sequence 286-428). In site-specific mutants of the VSV-Ind G gene defective in one or both glycosylation sites, only the amino-terminal epitopes of the VSV-Ind G protein were affected by deletion of the carbohydrate chain at residue 179; deletion of the carbohydrate chain at residue 336 did not alter reactivity of the G protein with any of the relevant monoclonal antibodies. These results are discussed in relation to earlier attempts to map the antigenic determinants of VSV-NJ and VSV-Ind G proteins by proteolysis of the G protein and by sequencing the G genes of mutant viruses selected for their resistance to neutralization by epitope-specific monoclonal antibodies.

Animals↗
PubMed1988

Magnetic resonance imaging in the evaluation of treatment in multiple sclerosis.

Magnetic resonance scans of 74 patients with multiple sclerosis participating in a controlled trial were compared 6 months before and at the end of a 24-32 months-treatment period with either Cyclosporin A (n = 31) or Azathioprine (n = 43). Both qualitative rating and computation of lesion volume showed deterioration in more than 40% of the patients, while by clinical criteria only 10-30% were worse. No significant difference was noted when the two treatment groups were compared. If careful repositioning and standardized image parameters are used, MRI is an indispensable tool for the objective determination of disease progression in MS although it cannot replace clinical examination.

Azathioprine↗
PubMed1987

An attempt to quantify magnetic resonance imaging in multiple sclerosis--correlation with clinical parameters.

The diagnostic value of magnetic resonance imaging (MRI) in multiple sclerosis (MS) is uncontested. But only little information exists on its usefullness in monitoring disease activity. We describe a method of quantification that can be performed in longitudinal MRI-investigations. We used a standardized method of scanning and determined the area of demyelinating lesions with an interactive planimetric computer system. In order to determine the approximate lesion volumes, the computed area was multiplied by the slice thickness. In 89 patients with clinically definite MS we found an average lesion volume of 11900 mm3. The mean score in Kurtzke's expanded disability scale was 3.0. The correlation between computed lesion volume and neurological deficit was significant, but only weak (rho = 0.3). We conclude, that planimetric evaluation of MRI can be a valuable supplement to clinical rating scales in MS patients. The method described here, used in combination with high spacial resolution and better tissue specificity of latest generation MRI scanners, could be helpful in the evaluation of treatment in many other CNS diseases.

Brain↗
PubMed1986

Flow cytometric analysis of nephroblastomas and related neoplasms.

A total of 59 cases of nephroblastoma and related neoplasms were studied by flow cytometry of paraffin-embedded tissue. According to clinical prognosis, cases were subdivided into three groups: Group 1 (low risk) consisted of congenital mesoblastic nephroma (n = 13) and cystic, partially differentiated nephroblastoma (n = 2). Group 2 (intermediate risk) comprised the various subtypes of "typical" nephroblastoma (n = 24) including cases of fetal rhabdomyomatous nephroblastoma (n = 4). In group 3 (high risk) there were cases of anaplastic nephroblastoma (n = 3), clear cell sarcoma of the kidney or "bone metastasizing renal tumor of childhood" (n = 7), and malignant rhabdoid tumor of the kidney (n = 6). The three clinically different groups of tumors also varied in the proportion of cases with aneuploid tumor DNA stemlines, in S-phase fractions, and in proliferation indices (PI = S + G2 + M). Group 1 was generally characterized by a small number of cases with aneuploid tumor DNA stemlines and low values for S-phase fractions and PI, whereas Group 3 showed the largest number of cases with aneuploid tumor DNA stemlines and high values for S-phase fractions and PI. Group 2 was in between. It is concluded that flow cytometry on paraffin-embedded tissue from pediatric tumors may be a useful adjunct in determining prognosis, and that the subdivision of nephroblastomas and related neoplasms into three prognostically different groups is warranted.

Aneuploidy↗
PubMed1986

Quantitative IgD measurement for discrimination of human bloodstains.

The IgD concentrations of eluates of artificial bloodstains and of the corresponding sera from 40 subjects of different ages were measured by single radial immunodiffusion. IgD was found in bloodstains stored up to 53 days, i.e. IgD storage stability is sufficient for forensic purposes. Since serum IgD concentrations of individuals, in particular of adults, are almost invariable and serum levels of different individuals can vary by more than a 1000-fold, the discrimination of bloodstains on the basis of IgD is generally possible. Thus IgD constitutes a further marker in antibody profiling of bloodstains.

Adolescent↗
PubMed1986

Analysis of a case of generalized amniotic fluid embolism by demonstrating the fetal isoantigen (A blood type) in maternal tissues of B blood type, using immunoperoxidase staining.

A case of generalized amniotic fluid embolism, confirmed by staining fetal isoantigen in the maternal tissues, is reported. The distribution of emboli may be more accurately evaluated with the immunochemical staining technic than with standard hematoxylin and eosin stain. The severity of the embolic state is evaluated very exactly.

ABO Blood-Group System↗