David A. Levinson

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This paper is a study on dynamic behavior of a :snake robot, called Serpentine robot, 2 " * version (SR#2). The SR#2 is the latest version of snake robots developed at FIBO as a research platform for studying serpmtine gaits. The gait is in form of sinusoidal curve, consi,dered one of the most effectiveness crawling pattem i:n the natural world. The Active(More)
We have assessed the biologic role of IL-4 by fusing its gene to an immunoglobulin promoter/enhancer and introducing it into transgenic mice. By attenuating the transgene promoter through the insertion of E. coli lac operator sequences, we have created a series of animals that constitutively express varying amounts of IL-4. Overexpression of IL-4 results in(More)
B-less mice express a human immunoglobulin (Ig) lambda transgene that induces a severe deficiency of both immature pre-B and mature B lymphocytes. To understand this perturbation in B lymphopoiesis, we have devised a sensitive limiting dilution polymerase chain reaction assay that quantitates specific Ig rearrangements and thus quantitates B lineage cells(More)
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