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Origin and significance of 13(2)-hydroxychlorophyll derivatives in sediments

first_imgThe authenticity of hydroxychlorophyllderivatives in sediments has been verified by subjecting pure chlorophyll preparations to the extraction method used for sediments. Model studies of chlorophyll autoxidation reveal hydroxychlorophyll as the major product formed in the presence of hydrogen peroxide. Its stability to further oxidation implies that hydroxychlorophyllderivatives are not precursors of aetioporphyrins and are more likely to produce cycloalkanoporphyrins via the processes of diagenesis. The occurrence of 132-hydroxyphaeophytin a throughout a sediment core from Loch Ness confirms it to be a widespread chlorophyll oxidation product formed during early diagenesis. Profiles of hydroxychlorophyllderivatives in a sediment core from an Antarctic lake demonstrate their potential for use as markers of oxidation processes in palaeoenvironmental assessment.last_img read more

Clippers’ Pat Beverley lives childhood dream at All-Star weekend in hometown

first_img Game 4 photos: Luka Doncic, Mavs shock Clippers in overtime Clippers’ Paul George: ‘If I make shots, this series could be a little different’ Clippers hope they can play to their capabilities, quell Mavericks’ momentum CHICAGO — Patrick Beverley is nothing if not ambitious.On Saturday morning, sitting on a dais for the first All-Star Game in his hometown in 32 years, Beverley laid out two of the goals that he reputedly scribbles down on Post-Its at his L.A. home – a long-term one, and one for the short-term.“First, being an NBA champion,” he said. “But first, right now, being a skills champion.”The short-term goal turned out to be short-lived: Beverley did not survive the first round of the NBA Skills Challenge after being out-passed and out-shot by Toronto’s Pascal Siakam, who was later bested by a field that included event winner Bam Adebayo of Miami. For Lakers’ LeBron James, Jacob Blake’s shooting is bigger issue than a big Game 4 victory But even then Beverley didn’t give up to the Raptors’ MVP candidate without one last shot – a half-court heave that wasn’t quite on target.The Clippers guard surrenders nothing without a fight: “I don’t take anything light.”That being said, Beverley got a chance to enjoy something more meaningful: Visiting his hometown during a very special All-Star Weekend. A native of Chicago’s west side who grew up facing extreme poverty, Beverley said the feeling of coming back to the place where his basketball career began was difficult to fully explain.Well, kind of. He said he was “turnt.”“I’m really excited to be back home, really excited to see my friends, the high school I went to (John Marshall),” he said. “Really excited to smell the Chicago air. Man, I’m so happy to be back home right now.”center_img The 31-year-old defensive menace is at a high point in his career. He signed a three-year, $40 million contract to remain with the Clippers in the offseason, and the team is among the favorites for the NBA title at 37-18. Beverley is often seen as the beating heart of the team’s competitive spirit, relentless in all things – even if he’s not necessarily the most skilled.His All-Star teammate, Kawhi Leonard, said he sees things in Beverley that he tries to feed off of.“His energy, his willingness to win every game, his toughness,” he said. “I take that every day.”Related Articles What the Clippers are saying the day after Luka Doncic’s game-winner tied series, 2-2 Newsroom GuidelinesNews TipsContact UsReport an Error Beverley credits his gritty style of play to his background, hardened in Chicago courts during his childhood. He marveled that the last Chicago All-Star Weekend, in which Michael Jordan dunked from the free-throw line, was before he was born. While he doesn’t watch the Bulls today, he grew up during the heart of the Jordan era, when the Bulls won six titles in eight years.“Lot of parades going on at that time,” he said. “The city was on fire – literally on fire. I guess you wanted to go out there and play basketball, that was every kid’s dream.”He takes a piece of that wherever he goes, he said, and he hopes it will lead him and the Clippers to a championship this year, which would be the franchise’s (and Beverley’s) first.But: One step at a time.“I represent Chicago, the grit of Chicago,” he said. “I’m just fortunate to represent the city today.”last_img read more