Da-Hui Zhang

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This study assessed the relative contributions of visual and proprioceptive/motor information during self-motion in a virtual environment using a speed discrimination task. Subjects wore a head-mounted display and rode a stationary bicycle along a straight path in an empty, seemingly infinite hallway with random surface texture. For each trial, subjects(More)
OBJECTIVE To observe the effect of acupuncture (Acu) on bone metabolism and serum estradiol (E2) in ovariectomized (OVX) rats for studying its underlying mechanism in treating osteoporosis. METHODS Forty female SD rats of six months were randomized into sham operation (sham), model, Acu and Diethylstibestrol (DES) groups, with 10 cases in each.(More)
An efficient route for the semi-synthesis of either 1α- or 1β-OH epimers of 1-hydroxy-3-deoxyolean-12-en-28-oic acid (1), 6-8 steps from oleanolic acid is reported. The synthesis involves stereoselective formation of α,β-unsaturated epoxy ketone and subsequent Wharton reaction as key steps, offering a new access to the 1-O-substituted oleanolic acid-type(More)
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