Simon Yoffe

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Müllerian inhibiting substance (MIS), produced by testicular Sertoli cells, is present in adult male serum. The first aim of this study was to determine if MIS is present in seminal plasma. Using an enzyme-linked immunosorbent assay (ELISA), we measured MIS concentrations in seminal plasma from 23 donors exhibiting normal (WHO criteria) sperm qualities, and(More)
OBJECTIVE To report a live birth with IVF-ET and intracytoplasmic sperm injection (ICSI) using sperm retrieved from a moribund man being maintained on life support systems. DESIGN Case report. SETTING Nonprofit private teaching hospitals. PATIENT(S) A 27-year-old man who was decorticate after an accident. INTERVENTION(S) Epididymal sperm retrieval(More)
The Union-Find data structure for maintaning disjoint sets is one of the best known and widespread data structures, in particular the version with constant-time Union and efficient Find. Recently, the question of how to handle deletions from the structure in an efficient manner has been taken up, first by Kaplan, Shafrir and Tarjan (2002) and subsequently(More)
Sperm flagellar activity is modulated by cAMP. In target tissues, vasoactive intestinal peptide (VIP) stimulates adenyl cyclase activity, which elevates intracellular cAMP levels and activates protein kinase activity. This study investigated the effects of VIP on motility of sperm from 17 subjects. Motile activities, monitored before (0 min, baseline) and(More)
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