Isoamylases in blood donors

Summary Sera of 1,000 blood donors were tested for various combinations of salivary and pancreatic amylase isoenzymes and the frequency of their occurrence was determined in the series mentioned. Five combinations of isoamylases were found. A combination of 1 salivary and 1 pancreatic amylase was found most frequently (89.5%), the frequency of the other four combinations was relatively low (0.2–5.1%).Hereditary character of amylase isoenzymes was confirmed in a series of 36 families.     

Antibacterially active substances

Synthesis of two hydroxy-derivatives of nalidixic acid as a result of microbial transformation was demonstrated in certain species of the genusAspergillus. Aspergillus alliaceus produced 7-hydroxy-nalidixic acid andAspergillus niger 6-hydroxy-nalidixic acid. It was demonstrated that the antibacterial activity of both hydroxy-derivatives (tested inEscherichia coli) was lower than that of the initial nalidixis acid.     

Neue oder wenig bekannte Flechten in der Tschechoslowakei. I

Es werden 28 Arten von lichenisierten Fungi (Flechten) mit kritischen taxonomischen Hinweisen oder Ergänzungen zu den in der Literatur vorhandenen Beschreibungen, oft mit chorologischen Bemerkungen und Angaben über die ökologischen Verhältnisse ihrer Standorte angeführt, von denen die nachgenannten Arten und Namenskombinationen neu sind:Verrucaria scabra Vězda sp. n.,Geisleria xylophila Vězda sp. n.,Toninia steineri Poelt etVězda sp. n.,Pachyascus byssaceus (Vězda) Vězda comb. n. undMicarea gomphillacea (Nyl.) Vězda comb. n.