Biomedical subjects

R Stein

Publications and source records attributed to R Stein.

At least 325 records · Page 18Linked to original sources

PubMed1975

Experimental and clinical studies of 5-fluorocytosine activity in Candida ocular infections. I. In vitro activity of 5-fluorocytosine on Candida species isolated from ocular infections.

In vitro sensitivity to 5-fluorocytosine (5-FC) of 35 Candida strains (14 C. albicans, 10 C. tropicalis, 5 C. parapsilosis, 2 C. guilliermondii, 2 C. krusei, 2 C. pseudotropicalis), isolated from the eyes of patients suffering from various external ocular inflammations who had not been treated with 5-FC, was tested and compared to that of standard Candida species. The minimal inhibitory concentration (MIC) and minimal fungicidal concentration (MFC) of 5-FC for the strains isolated from ocular infections ranged from 0.06 to 1.95 mug/ml and from 0.24 to 7.81 mug/ml, respectively, indicating that no primary resistant strains to 5-FC were found in this series.

Animals↗

PubMed1975

Yeasts in banal external ocular inflammations.

In 53 out of 313 patients suffering from longstanding inflammations of the outer eye or dacryocanaliculitis, not yielding to the obligate treatment with antibiotics and steroids, yeasts were isolated and regarded as the causative agents. Among the yeasts, different Candida species were prevalent, with C. albicans and C. guillermondii at the top. An obstinate, superificial epithelial and subepithelial punctate keratitis appeared to represent an entity pathognomonic of a yeast infection. Eradication of the yeasts and cure of the inflammation was achieved only by intensive prolonged treatment with Mycostatin or amphotericin B.

Acute Disease↗

PubMed1975

A spectrophotometric method for quantitative determination of lysozyme in human tears: description and evaluation of the method and screening of 60 healthy subjects.

A spectrophotometric micromethod for lysozyme determination in tears is described, which enables the estimation of very low concentrations of lysozyme in individual tear samples, and which can be performed rapidly. The method is based on collecting the tears by a microcapillary tube and diluting them in a special manner which increases the volume of the tear sample, thus making possible analysis of other tear constituents in addition to lysozyme. Lysozyme activity in tears is determined by reduction of optical density (OD) of Micrococcus lysodeikticus suspension. The sensitivity of the method was determined on the basis of repetitive readings. The level of lysozyme in tears of 60 healthy people was determined by this method and found to be 6.1 mg. per milliliter hen egg lysozyme (HEL) with standard deviation of 1.57 mg. per milliliter HEL or 1.5 mg. per milliliter human tear lysozyme (HTL) with standard deviation of 0.39 HTL. Lysozyme level in tears of both eyes of each individual is equal, and any difference observed between the two eyes is due to the variability of the method.

Adolescent↗

PubMed1975