Sporadic E at Brisbane

Abstract

SummaryFurther data are presented in support of McNicol and Gipps's classification of two types of sporadic E at Brisbane (lat. 27·5 oS.), namely, sequential type (Ess) and constant-height type (Esc) ' Information is given OIl the occurrence, critical and blanketing frequencies, reflection coefficients, range spreading, vertical movements, and lateral extent of Es patches.No correlation is found with sunspot cycle, meteor occurrence, or thunderstorm activity. Scattering from a turbulent mediun:i is not responsible for Esc at Brisbane .. Tidal movement is regarded as the most likely cause of both types of E s'A method of obtaining information about D region absorption is briefly discussed.

Fungal Cellulases V. ENZYMIC PROPERTIES OF ST ACHYBOTRYS ATRA ,a-GLUCOSIDASE

“…This inactivation was irreversible and, since lead has no irreversible effects on the activity (see Part IV of this series), it does not appear to be due to reaction with sulphydryl groups. Thomas (1956) has shown that the cellulase of S. atra is inactivated by mercuric salts, but is insensitive to sulphydryl reagents. Since thallium and silver slowly gave precipitates in the incubation medium used, all further work was done using mercury.…”

Fungal Cellulases XIII. Specificity of the Induction of the ?-Glucosidase of Stachybotrys Atra

“…Cellobiase was measured manometrically (Youatt 1958), and colorimetrically (Jermyn 1961) with the Shimadzu QR 50 spectrophotometer. Cellulase was measured by the viscometric method of Thomas (1956). Induced cellobiase and cellulase were found to be retained within the fungal cells, in contrast' to the mixture of intracellular and extracellular enzyme obtained in experiments with ,B-glucosidase induction.…”

Ionospheric Drifts at Brisbane

“…In the histograms for theF region at night (Fig. 3), except for Figure 3 Thomas (1956), it was found that E s ' at night, records approximately 60 per cent. of the time.…”