Thermal Inactivation Patterns of Aspergillus niger Spores and Mycelia.

Thermal inactivation of aerosolized Bacillus subtilis var. niger spores.

A hot-air sterilizer capable of exposing airborne microorganisms to elevated temperatures with an almost instantaneous heating time was developed and evaluated. With this apparatus, aerosolized Bacillus subtilis var. niger spores were killed in about 0.02 sec when exposed to temperatures above 260 C. This is about 500 times faster than killing times reported by others. Extrapolation and compari...

Electrophoretic properties of spores of Aspergillus niger.

This report concerns an investigation of an important aspect of fungal growth, the nature of the spore surface. The spore is the propagative body of the fungus so a knowledge of its germination process is of primary importance. The surface of the spore necessarily plays an integral part in this process since it is the first point of contact between the spore and such factors as water, food, and...

The impact of dose, irradiance and growth conditions on Aspergillus niger (renamed A. brasiliensis) spores low-pressure (LP) UV inactivation.

The use of Aspergillus niger (A. niger) fungal spores as challenge organism for UV reactor validation studies is attractive due to their high UV-resistance and non-pathogenic nature. However A. niger spores UV dose-response was dependent upon sporulation conditions and did not follow the Bunsen-Roscoe Principle of time-dose reciprocity. Exposure to 8 h of natural sunlight for 10 consecutive day...

Thermal inactivation and injury of Bacillus stearothermophilus spores.

Aqueous spore suspensions of Bacillus stearothermophilus ATCC 12980 were heated at different temperatures for various time intervals in a resistometer, spread plated on antibiotic assay medium supplemented with 0.1% soluble starch without (AAMS) or with (AAMS-S) 0.9% NaCl, and incubated at 55 degrees C unless otherwise indicated. Uninjured spores formed colonies on AAMS and AAMS-S; injured spor...

Irreversible thermal denaturation of Glucose oxidase from Aspergillus niger