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Biomedical subjects

D Schaefer

Publications and source records attributed to D Schaefer.

42 records · Page 3Linked to original sources
PubMed1980

[Early or delayed operation in patients with acute cholecystitis. Results of a prospective randomized controlled clinical trial (author's transl)].

In a prospective controlled randomized clinical trial, 60 patients with acute cholecystitis (diagnosed according to well defined criteria) were allocated randomly to early operation (n=28) or conservative treatment followed by delayed operation (n=30). The formed groups were well balanced. Total duration of hospitalization was 12 days for the early and 22 days for the delayed operation group. One case of death in the second group appeared to be due to pancreatic necrosis. From other complications recorded, only stitch sinus seemed to occur more frequently in the early operation group. For the first time the success of the two therapeutic procedures was evaluated by means of a systematic follow-up 6 weeks and 6 months after operation. The outcome was the same in both groups and "very good" and "good" for all patients. From these results early operation as the routine method for acute cholecystitis can be recommended unconditionally.

Acute Disease↗
PubMedDate not supplied

Structural characterization of canine PYY.

PYY was purified from canine colonic mucosa by sequential steps of reverse phase HPLC and ion-exchange FPLC. Microsequence, amino acid and mass spectral analyses of the purified peptide and its tryptic fragments were consistent with the structure: YPAKPEAPGEDASPEELSRYYASLRHYLNLVTRQRY-amide. Canine PYY(1-36) has the identical sequence as porcine and rat PYY but differs from human PYY at position 3, with Ala instead of Ile, and position 18, with Ser instead of Asn. A smaller form, PYY(3-36), was also purified and characterized. It may differ in its biological activity from the intact peptide and could act as a partial antagonist or agonist of PYY(1-36).

Amino Acid Sequence↗
PubMedDate not supplied

Subacute effects of ozone exposure on cultivated human respiratory mucosa.

This study was designed to investigate subacute effects of long-term exposure of both healthy and chronically inflamed human respiratory mucosa to ozone. Functional and metabolic effects on ciliary beat frequency (CBF), release of interleukin 8 (IL-8), interleukin 4 (IL-4), and gamma interferon (g-INF), as well as cellular viability and cytotoxicity, were monitored. Cell cultures of 60 specimens (healthy mucosa: n = 30, inflamed mucosa: n = 30) were exposed to synthetic air and to ozone-enriched synthetic air in different concentrations of 100, 500, and 1000 micrograms/m3. Continuous expositions were performed using an air/liquid interface cell culture technique for a period of 4 weeks. CBF was monitored using video-interference contrast microscopy and cytokine release was quantified by enzyme immunoassays. Cellular viability and cytotoxicity were controlled by measuring lactate dehydrogenase activity, cytosolic activity of esterases, and by staining of nuclear DNA. Synthetic air had no influence on CBF during the 4 weeks of exposure. IL-8 release was continuously diminished in unaffected and in chronically inflamed mucosa. Within the first week of continuous exposure with any ozone concentration neither CBF nor release of IL-8 were affected in healthy or in inflamed mucosa. During the second and the following weeks of exposure CBF and the release of IL-8 were reduced in both tissues. Release of IL-4 or g-INF were not detectable at any time during the 4 weeks of ozone exposure. At higher ozone concentrations of 500 and 1000 micrograms/m3 there was an increase of cytotoxicity which was greater in chronically inflamed than in healthy mucosa. In conclusion, ozone had no measurable effect on those parameters measured in human upper respiratory epithelium after one week of in vitro exposure to different concentrations, but did after longer periods of exposure. Chronically inflamed mucosa had a tendency toward a higher susceptibility to intermediate and high concentrations of ozone that did not reach a level of statistical significance under the conditions used in this study.

Adolescent↗