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U Schoen

Publications and source records attributed to U Schoen.

10 recordsLinked to original sources
PubMed2000

A simplified HPTLC screening method for the estimation of the PAH content in soil samples.

Based on a highly significant correlation between the visual fluorescing fraction of PAH on the one hand and the total EPA-PAH16 content in mineral soils on the other hand, a deliberately incomplete RP-TLC separation of these compounds into a few fingerprint-like compressed bands within a determined "PAH window" has been achieved. The resulting band-pattern does not interfere normally with the more or less non-polar phenolic compounds which are associated with natural soil humic substances. The extraction step has been extremely simplified with regard to the quantity of the soil sample and of the extractant. The accuracy of this procedure has been ascertained by means of recovery experiments with an artificial soil enriched with PAH. A single spot application mode and an evaluation scheme allow the estimation of EPA-PAH16 contents of soil samples in relation to threshold values (1 or 5 or 10 mg/kg). This HPTLC screening method has been compared against standard HPLC methods. The simplified extraction step and the separation by HPTLC minimizes the actual costs and the time spent per sample.

Benzene↗
PubMed1981

[Endolymphatic stromal myosis, a rare semimalignant tumour (author's transl)].

The rarely occurring disease of endolymphatic stromal myosis is discussed by means of an impressive case. The cells of this semimalignant tumour resemble those of the endometrium, but it is not clear whether this tumour can be derived histogenetically from the endometrium or from the cells of the duct of Müller (ductus paramesonephricus) or from pericytal cells. The histological pattern of the tumour, which is characterized by the uniformity of small spindle-like oval cells without remarkable mitotic activity, and by a lack of atypical criteria, does not permit any prognosis in respect of its clinical behaviour. According to the rare references in literature, the clinical course is usually protracted with occasional occurrence of metastases and relapses. The therapy consists of radiotherapy and administration of progesterone. The case described in this article is a clinically malignant one because of disseminated metastases and relapse following initially successful therapy.

Adult↗
PubMed1981

[Thorotrast cancer following vesiculography in chronic prostatitis].

33 years after vesiculography using the X-ray contrast remedy Thorotrast on transurethral way in a patient with chronic prostatitis a carcinoma developed in the region of the vesical neck. Histologically the tumour imposed now as a differentiated urothelium carcinoma of medium degree. By autoradiography in the region of the tumour structures radioactive Thorotrast could be proved. On account of the close topographical relations and the long time of latency the development of the carcinoma seems to be ascertained by the then application of Thorotrast. The connections are discussed.

Aged↗
PubMed1977

[Myoblastoma of the larynx (author's transl)].

The case of a 35-year-old man in whom a broad-based tumour of the left vocal cord was found to be the cause of hoarseness of 4 months' duration is reported. The tumour was completely removed and proved to be a myoblastoma. Twelve months postoperatively there was no recurrence. Whether these are true neoplasms in all cases is still uncertain. Recurrence, multifocal origin and malignant change, factors which cannot be excluded, underline the need for the long-term follow-up.

Adult↗