60 research outputs found
Author correction: a novel atypical sperm centriole is functional during human fertilization
No full textIn the original version of this Article, the affiliation details for Jadranka Loncarek and Vito Mennella were incorrectly given as 'Cell Biology Program, The Hospital for Sick Children, Department of Biochemistry, University of Toronto, 555 University Avenue, Toronto, ON, M5G 1X8, Canada' and 'Laboratory of Protein Dynamics and Signaling, Center for Cancer Research, National Cancer Institute, 1050 Boyles Street, Frederick, MD, 21702, USA', respectively. This has now been corrected in both the PDF and HTML versions of the Article.</p
Microtubules in Mouse Oocytes, Zygotes, and Embryos during Fertilization and Early Development: Unusual Configurations and Arrest of Mammalian Fertilization with Microtubule Inhibitorsa
No full textAcrosome components after intracytoplasmic sperm injection: the decondensation frontier
No full texthttp://www.sciencedirect.com/science/article/B6T6K-43CBFGC-14/1/c122d3f8e7188ef9ec4a133a8068995
Substitution and redox reactions of heptarhenium cluster derivatives
No full textThe second-order rate constants for the reactivity of (Re\sb7C(CO)\sb{21}Rh(CO)\sb2) \sp{2-} towards phosphorus donors were determined. In order to correlate the results to electronic and/or steric effects, steric profiles relating log k\sb2 to an intrinsic reactivity an electronic parameter and a steric parameter were constructed. From differences in intrinsic reactivity for phosphines and phosphites, an intermediate configuration involving a bridging carbonyl has been proposed for the reaction of (Re\sb7C(CO)\sb{21}Rh(CO)\sb2) \sp{2-} with various phosphorus donors (PY\sb3).Nitrosylation of a series of mixed-metal heptarhenium clusters, (Re\sb7C(CO)\sb{21}ML\sb{\rm n}) \sp{2-}, gave the mono-substituted products, (Re\sb7C(CO)\sb{20}ML\sb{\rm n}\rbrack\sp-. A variety of spectroscopic techniques were used to characterize the reaction products. Variable temperature \sp{13}C NMR studies determined the solution structure of (Re\sb7C(CO)\sb{20}(NO)Rh(CO)\sb2) \sp-. From kinetic studies, the nitrosyl substituted cluster (Re\sb7C(CO)\sb{20}(NO)Rh(CO)\sb2) \sp- exhibits enhanced reactivity toward phosphorus ligands in comparison with (Re\sb7C(CO)\sb{21}Rh(CO)\sb2) \sp{2-}.The carbonyl ligands bound to (Re\sb7C(CO)\sb{21}Rh(CO)\sb2) \sp{2-} display unusual intermolecular and intramolecular exchange. Upon treatment with \sp{13}CO, (Re\sb7C(CO)\sb{21}Rh(CO)\sb2) \sp{2-} is selectively \sp{13}CO enriched to (\rm Re(CO)\sb3Re\sb6C(\sp{13}CO)\sb{18}Rh(\sp{13}CO)\sb2\rbrack \sp{2-}. A capping Re(CO)\sb3 moiety trans to the rhodium cap remains unenriched. Formation of the radical species (Re\sb7C(CO)\sb{21}Rh(CO)\sb2\rbrack\sp- by chemical oxidation results in complete carbonyl scrambling, which is revealed upon reduction to the parent cluster (\rm Re(\sp{13}CO)\sb3Re\sb6C(\sp{13}CO)\sb{18}Rh(\sp{13}CO)\sb 2\rbrack \sp{2-}. The selectively \sp{13}Co enriched cluster (Re(CO)\sb3Re\sb6C(\sp{13}CO)\sb{18}) \sp{2-} has been formed in a decapping reaction of (\rm Re(CO)\sb3Re\sb6C(\sp{13}CO)\sb{18}Rh(\sp{13}CO\sb2\rbrack \sp{2-} with excess PPh\sb3 in acetonitrile.Two-electron oxidation of (Re\sb7C(CO)\sb{21}) \sp{3-} in the presence of P(OPh)\sb3 affords (Re\sb7C(CO)\sb{21}(P(OPh)\sb3)) \sp-. \sp{13}C NMR indicates that this cluster exhibits partial charge separation. (Re\sb7C(CO)\sb{21}(P(OPh)\sb3)) \sp- decomposes in acetonitrile to form (Re\sb6C(CO)\sb{19}) \sp{2-} and (Re(CO)\sb3(P(OPh)\sb3)\sb2(NCCH\sb3)) \sp+, and therefore it represents a directly observed intermediate in a cluster decapping reaction.Made available in DSpace on 2011-05-07T12:36:21Z (GMT). No. of bitstreams: 2
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Previous issue date: 1991Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding ([email protected]) on 2011-05-07T14:43:13Z
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Rhesus offspring produced by intracytoplasmic injection of testicular sperm and elongated spermatids
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