Rachel M. Pollard

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This review offers a critical analysis of the state of the art of medical microbubbles and their application in therapeutic delivery and monitoring. When driven by an ultrasonic pulse, these small gas bubbles oscillate with a wall velocity on the order of tens to hundreds of meters per second and can be deflected to a vessel wall or fragmented into(More)
Transmural electrical stimulation and exposure to incubation media where some or all of the Na+ had been replaced with K+ were used to elicit transmitter release. Changes in noradrenaline content and ultrastructure of the nerve terminal varicosities in rat vas deferens were measured. Electrical stimulation in the presence of 4-aminopyridine had little(More)
The fluorescence histochemical method for catecholamines shows differences in both innervation density and fluorescence intensity between sympathetic nerve terminals in different organs. Quantitative electron microscopy shows differences in vesicle density in varicosities of nerve terminals in heart, spleen and vas deferens of the rat. The electron-dense(More)
The fog-basking beetle, Onymacris unguicularis (Haag, 1875), is currently listed as a polytypic form comprising two subspecies. A flightless substrate specialist, the beetleis endemic to vegetationless dunes in the Namib, where southern populations constitute the nominate subspecies, O. u. unguicularis, and populations some 300 km to the north compose O. u.(More)
I hereby declare I am the sole author of this thesis. It is the result of my own work and is not the outcome of work done in collaboration, nor has any of it been submitted elsewhere for another degree. ABSTRACT-The southern African beetle genus Onymacris (family Tenebrionidae) comprises 14 species, six of which are polytypic. Despite longstanding research(More)
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