William C. Tang

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The phenanthridine alkaloid lycobetaine is a minor constituent of Amaryllidaceae. Inhibition of cell growth was studied in the clonogenic assay on 21 human tumour xenografts (mean IC(50) = 0.8 microM). The growth of human leukaemia cell lines was also potently inhibited (mean IC(50) = 1.3 microM). Athymic nude mice, carrying s.c. implanted human gastric(More)
The design and fabrication of a newly proposed vaporizing liquid micro-thruster concept i s described. The intended purpose of this thruster concept is for use as an attitude control device o n new generations of very small spacecraft envisioned by the National Aeronautics and Space Administration (NASA), ranging in mass between 1-20 kg. The vaporizing(More)
A clamp-and-ratchet microstructure based on poly crystalline silicon (polysilicon) microelectromechanical systems (MEMS) technology has been designed to exert mechanical tension along radial glial processes between groups of neural stem cells to study the effect of tension on cerebral cortex neurogenesis. FEA analysis shows that the design should not fail(More)
This paper reports the design, fabrication and simulation of a novel micromachined electrode array with a form-fitting profile for use in auditory nerve prostheses. A 10times10 electrode array is created in a 1mm<sup>2</sup> area using bulk micromachining technology. The space between the individual electrodes within the array is filled with a layer of SU-8(More)
UNLABELLED In this article we demonstrate the effect of mechanical compression on the behavior of cultured neural stem cells using a microelectromechanical system platform. Polydimethylsiloxane (PDMS)-based stretchable substrates were used on a neurosphere (NS) assay to investigate the role of mechanical forces on the formation of radial glial processes and(More)
—The mechanical interactions between cells and the extracellular matrix (ECM) play important roles in many biological processes, including cell proliferation, migration, and differentiation. The cells can probe the stiffness of the ECM and alter their own function accordingly. The objective of this study was to investigate the applicability of a(More)