The title compound, C(27)H(40)O(4), was obtained from the oxidation of (25R)-3b-hydr-oxy-5a-spiro-stan-12-one (Hecogenin) by Jone's reagent. The mol-ecule contains six alicyclic and heterocyclic rings, all trans-fused, among which four six-membered rings adopt similar chair conformations while two five-membered rings assume an envelope conformation.

This paper proposes a method called meshless parameterization for param eterizing and triangulating single patch unorganized point sets The points are mapped into a planar parameter domain by solving a sparse linear system By making a stan dard triangulation of the parameter points we obtain a corresponding triangulation of the original data set

Kristina A. Uban, MA, Julia Rummel, MS, Stan B. Floresco, Ph.D., Liisa A. M. Galea, Ph.D. Department of Psychology, Graduate Program in Neuroscience, Brain Research Centre, University of British Columbia, Vancouver, BC International Graduate Program Medical Neurosciences, Charité Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, & Department of Psychiatry and Psychotherapy, Technical Un...

The Pulse Code Modulation (PCM) method of digitizing analog signals has become a stan~ard both in digital audio and in speech research, the focus of this paper. The solutions to some problems encountered in earlier systems at Haskins Laboratories are outlined, along with general properties of AID conversion. Specialized features of the current Haskins Laboratories system, which has also been in...