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Full-Text Articles in Physical Sciences and Mathematics
New Bis(Imino)Pyridine Complexes Of Iron(Ii) And Iron(Iii), And Their Catalytic Activity In The Mukaiyama Aldol Reaction, Pushkar Shejwalkar, Nigam Rath, Eike Bauer
New Bis(Imino)Pyridine Complexes Of Iron(Ii) And Iron(Iii), And Their Catalytic Activity In The Mukaiyama Aldol Reaction, Pushkar Shejwalkar, Nigam Rath, Eike Bauer
Chemistry & Biochemistry Faculty Works
New iron(II) and iron(III) complexes bearing bis(imino)pyridine ligands were synthesized and successfully applied to the Mukaiyama aldol reaction. The two complexes [FeCl2 L] (L = bis(imino)pyridine ligand, 55% isolated yield) and [LFe(μCl)3FeCl3] (76%) were obtained employing FeCl2 and FeCl3 iron sources, respectively, and characterized by elemental analyses, mass spectrometry, IR spectroscopy and, one example, by X-ray diffraction. The two new iron complexes were subsequently employed as catalysts in the Mukaiyama aldol reaction after abstraction of two chlorides by AgSbF6 to obtain the aldol products in 43% to virtually quantitative yield (CH2Cl2 solvent, room temperature, 3.5 to 16 h reaction time). …
Dna Damage Repair Genes Controlling Human Papillomavirus (Hpv) Episome Levels Under Conditions Of Stability And Extreme Instability, Terri Edwards, Thomas Vidmar, Kevin Koeller, James Bashkin, Chris Fisher
Dna Damage Repair Genes Controlling Human Papillomavirus (Hpv) Episome Levels Under Conditions Of Stability And Extreme Instability, Terri Edwards, Thomas Vidmar, Kevin Koeller, James Bashkin, Chris Fisher
Chemistry & Biochemistry Faculty Works
DNA damage response (DDR) genes and pathways controlling the stability of HPV episomal DNA are reported here. We set out to understand the mechanism by which a DNA-binding, N-methylpyrrole-imidazole hairpin polyamide (PA25) acts to cause the dramatic loss of HPV DNA from cells. Southern blots revealed that PA25 alters HPV episomes within 5 hours of treatment. Gene expression arrays identified numerous DDR genes that were specifically altered in HPV16 episome-containing cells (W12E) by PA25, but not in HPV-negative (C33A) cells or in cells with integrated HPV16 (SiHa). A siRNA screen of 240 DDR genes was then conducted to identify enhancers …
Psychosine, The Cytotoxic Sphingolipid That Accumulates In Globoid Cell Leukodystrophy, Alters Membrane Architecture, Jacqueline Hawkins-Salsbury, Archana Parameswar, Xuntian Jiang, Paul Schlesinger, Ernesto Bongarzone, Daniel Ory, Alexei Demchenko, Mark Sands
Psychosine, The Cytotoxic Sphingolipid That Accumulates In Globoid Cell Leukodystrophy, Alters Membrane Architecture, Jacqueline Hawkins-Salsbury, Archana Parameswar, Xuntian Jiang, Paul Schlesinger, Ernesto Bongarzone, Daniel Ory, Alexei Demchenko, Mark Sands
Chemistry & Biochemistry Faculty Works
Globoid cell leukodystrophy (GLD) is a neurological disease caused by deficiency of the lysosomal enzyme galactosylceramidase (GALC). In the absence of GALC, the cytotoxic glycosphingolipid, psychosine (psy), accumulates in the nervous system. Psychosine accumulation preferentially affects oligodendrocytes, leading to progressive demyelination and infiltration of activated monocytes/macrophages into the CNS. GLD is characterized by motor defects, cognitive deficits, seizures, and death by 2–5 years of age. It has been hypothesized that psychosine accumulation, primarily within lipid rafts, results in the pathogenic cascade in GLD. However, the mechanism of psychosine toxicity has yet to be elucidated. Therefore, we synthesized the enantiomer of …
Hydraphiles: A Rigorously Studied Class Of Synthetic Channel Compounds With In Vivo Activity, Saeedeh Negin, Bryan Smith, Alexandra Unger, W. Leevy, George Gokel
Hydraphiles: A Rigorously Studied Class Of Synthetic Channel Compounds With In Vivo Activity, Saeedeh Negin, Bryan Smith, Alexandra Unger, W. Leevy, George Gokel
Chemistry & Biochemistry Faculty Works
No abstract provided.