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Biomedical subjects

E Stoll

Publications and source records attributed to E Stoll.

At least 19 recordsLinked to original sources

Osteomyelitis at the injection site of adrenalin through an intraosseous needle in a 3-month-old infant.

Intraosseous (IO) puncture is considered for the administration of drugs and fluids when vascular access cannot be achieved rapidly. Adrenaline/epinephrine, adenosine, crystalloids, colloids and blood products can be applied and administered effectively using this route during resuscitation of children. This technique is relatively simple with complications of <1%. These may include tibial fracture, lower extremity compartment syndrome and osteomyelitis. A case is described in which a 3-month-old male infant presented for emergency resuscitation requiring IO infusion utilising both tibial bones. High doses of adrenaline (1:1000; 0.1 mg/kg) were administered in the right tibial epiphysis only after the standard initial concentration (1:10000; 0.01 mg/kg) had minimal effect. A local inflammatory reaction was noted 24 h later in the right tibial region, which developed into cutaneous necrosis, and was eventually resected. Radiologically, no osseous lesion could be demonstrated, however, a bone scintigram revealed osteomyelitis. Upon surgical revision, purulent destruction was evident requiring removal of the epiphysis and part of the metaphysis. Although osteomyelitis is a rare complication which may be caused by sepsis, or contamination during insertion, we speculate that adrenaline in high concentrations may promote the development of osteomyelitis and the drug should be applied cautiously in more diluted concentrations.

Anti-Bacterial Agents↗

A new filtering algorithm for medical magnetic resonance and computer tomography images.

Inner views of tubular structures based on computer tomography (CT) and magnetic resonance (MR) data sets may be created by virtual endoscopy. After a preliminary segmentation procedure for selecting the organ to be represented, the virtual endoscopy is a new postprocessing technique using surface or volume rendering of the data sets. In the case of surface rendering, the segmentation is based on a grey level thresholding technique. To avoid artifacts owing to the noise created in the imaging process, and to restore spurious resolution degradations, a robust Wiener filter was applied. This filter working in Fourier space approximates the noise spectrum by a simple function that is proportional to the square root of the signal amplitude. Thus, only points with tiny amplitudes consisting mostly of noise are suppressed. Further artifacts are avoided by the correct selection of the threshold range. Afterwards, the lumen and the inner walls of the tubular structures are well represented and allow one to distinguish between harmless fluctuations and medically significant structures.

Algorithms↗

Too little concern for breast cancer risk in radiation protection estimates?

Risk estimates of radiogenic breast cancer from recent consensus reports are found to depend as much on the models used as on the data. Some features of the models of BEIR V and the ICRP 1990 Recommendations are hardly supported in the literature and tend to underrate breast cancer risk in radioprotection.

Breast Neoplasms↗

Scanning tunneling microscopy of recA-DNA complexes coated with a conducting film.

A link between scanning tunneling microscopy (STM) and conventional transmission electron microscopy has been established for biological material by applying STM on freeze-dried recA-DNA complexes coated with a conducting film. The topography of the complexes observed by means of STM revealed a right-handed single helix composed of about six recA monomers per helical turn.

DNA↗

[Course and quantitative evaluation of the lung involvement in cystic fibrosis].

On the basis of clinical observations the course of pulmonary involvement in cystic fibrosis is studied, and an attempt at classification into three severity groups is made. Clinical and radiological findings, quantified by special scores, are presented and correlations between scores and lung function data are demonstrated. Although respiratory function tests - in particular the ratio of residual volume to total lung capacity (RV/TLC) - correlate with the clinical and chest radiographic scores, division into three severity degrees is only reliable for groups of patients. In the individual patient the clinical, radiological and lung function findings must be taken into account together. Assessment according to a scoring system may be helpful.

Child↗

[Morbidity and mortality in cystic fibrosis. Results of 20 years of experience].

In this study the clinical data and treatment concept in 197 patients with cystic fibrosis, seen during the past 20 years at the University Children's Hospital of Berne (Switzerland), are presented. The results showed that during recent years the median age of survival, the mean age at death and the cumulative survival rates have improved. Furthermore, this study demonstrates that by forming groups of patients with similar age at diagnosis the cumulative survival rate declined in the group with early diagnosis much more markedly than in the group of patients with later diagnosis. Further evaluation of these data revealed that most patients of the former group had a more severe form of cystic fibrosis than the latter group. Since there are different patterns of severity in this disease, it will be necessary to develop staging for the purpose of statistical comparisons.

Adolescent↗

Revised amino acid sequence of Qbeta coat protein between positions 1 and 60.

A reinvestigation of the primary structure of Qbeta coat protein between positions 1 and 60 was undertaken to resolve two discrepancies between the published amino acid seuqence (Maita, T., and Konigsberg, W. (1971) J. Biol. Chem. 246, 5003-5024) and the cognate nucleotide sequence recently determined in our laboratory (C. Escarmis and M. A. Billeter, unpublished results). The 22nd amino acid was asparagine rather than aspartic acid, and an additional amino acid, serine, was present between proline in position 55 and arginine in position 56. The revised structure agrees with the nucleotide sequence determined so far.

Amino Acid Sequence↗

Avian myeloblastosis virus RNA is terminally redundant: implications for the mechanism of retrovirus replication.

We have determined the terminal heteropolymeric sequences of AMV RNA by the following procedures: first, RNA sequence determination on the 5' terminal and the poly(A)-linked 3' terminal T1 oligonucleotides, and second, analysis by the Maxam and Gilbert (1977) method of AMV strong stop DNA and of DNA complementary to the poly(A)-linked T1 oligonucleotide, synthesized with reverse transcriptase and (pdT)13 as primer. The structure deduced for the 5' terminal region is (5')7mGpppGmCCAUUCUACCUCUCACCACAUUGGUGUGCACCUGGGUUGAUGGCCGGACCGUCGAUUCCCUGACGACUACGAGCACCUGCAUGAAGCAGAAGGCUUCAU... Two distinct 3' terminal sequences were deduced: GCCAUUCUACCUCUCAAA...AOH and GCCAUUCUACCUCUCACCAAA...AOH. The two termini, differing by a C-C-A sequence, may reflect genetic heterogeneity of the AMV stock or, more probably, may be generated at or after RNA transcription. These results demonstrate a terminal redundancy of the hetero polymeric sequence of 16 and 19 nucleotides, respectively. The terminal redundancy allows for mechanisms which involve transfer of the DNA segment synthesized on the 5' terminal redundant sequence to the 3' terminal redundant sequence.

Alpharetrovirus↗

Aminopeptidase II from Bacillus stearothermophilus.

1. The low molecular weight aminopeptidase (aminopeptidase II) from Bacillus stearothermophilus cells grown at 50 degrees C was purified to a homogeneous state. 2. Molecular weight determination by sodium dodecyl sulfate gel electrophoresis resulted in a value of 46 000 for the subunits. A molecular weight of 80 000-100 000 has been reported for the native enzyme. We therefore conclude that aminopeptidase II is a dimeric enzyme. 3. The amino-terminal sequence, the amino acid analysis and the subunit molecular weight of aminopeptidase II show no relationship to the corresponding data of aminopeptidase I. 4. Aminopeptidase II binds two Co2+ per subunit. The dissociation constants of these ions determined by binding studies and by kinetic analysis agree within experimental error.

Amino Acids↗