24 research outputs found

    Etude du principe et realisation d'un prototype 'faibles profondeurs' d'un profileur de courant a effet Doppler acoustique autonome

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    Available from INIST (FR), Document Supply Service, under shelf-number : AR 15808 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEMinistere de l'Enseignement Superieur et de la Recherche, 75 - Paris (France)FRFranc

    Structure of a new saponin: chrysantellin A from Chrysanthellum procumbens Rich.

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    International audienceA new saponin has been isolated from a tropical plant Chrysantellum procumbens Rich. which is thought to be useful in the therapy of digestive troubles. The structure of this saponin was determined by chemical methods, nuclear magnetic resonance and mass spectrometry. The aglycone moiety is a triterpene, echinocystic acid; D-glucose, D-xylose and L-rhamnose are carbohydrate components. The structure of saponin was established as 3-O-beta-D-glucopyranosyl [L-rhamnopyranosyl-(alpha 1 leads to 3)-D-xylopyranosyl-)beta 1 leads to 4)-L-rhamnopyranosyl-(alpha 1 leads to 2)-D-xylopyranosyl]-(alpha 1 leads to 28)-echinocystyl. The name, chrysantellin A, is proposed for this new saponin.A new saponin has been isolated from a tropical plant Chrysantellum procumbens Rich. which is thought to be useful in the therapy of digestive troubles. The structure of this saponin was determined by chemical methods, nuclear magnetic resonance and mass spectrometry. The aglycone moiety is a triterpene, echinocystic acid; D-glucose, D-xylose and L-rhamnose are carbohydrate components. The structure of saponin was established as 3-O-beta-D-glucopyranosyl [L-rhamnopyranosyl-(alpha 1 leads to 3)-D-xylopyranosyl-)beta 1 leads to 4)-L-rhamnopyranosyl-(alpha 1 leads to 2)-D-xylopyranosyl]-(alpha 1 leads to 28)-echinocystyl. The name, chrysantellin A, is proposed for this new saponin

    [Structure of chrysantellin B, a new saponin isolated from Chrysanthellum procumbens Rich (author's transl)]

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    International audienceA new saponin, chrysantellin B, has been found in a tropical plant Chrysanthellum procumbens Rich as a minor companion of chrysantellin A which was previously studied. The structure of chrysantellin B was determined by mass spectrometry, proton and 13C nuclear-magnetic resonance. The aglycone part is a triterpene: 3 beta, 16 alpha, 23-trihydroxy-olean-12-en-28-oic acid or caulophyllogenin. Carbohydrate components are D-glucose, D-oxylose and L-rhamnose in a molar ratio 1:2:2. The structure of chrysantellin B was established as 3-O-beta-D-glucopyranosyl[L-rhamnopyranosyl-(alpha 1 leads to 3)-D-xylopyranosyl-(beta 1 leads to 4)-L-rhamnopyranosyl-(alpha 1 leads to 2)-D-xylopyranosyl-(beta 1 leads to 28)]caulophyllogenin.A new saponin, chrysantellin B, has been found in a tropical plant Chrysanthellum procumbens Rich as a minor companion of chrysantellin A which was previously studied. The structure of chrysantellin B was determined by mass spectrometry, proton and 13C nuclear-magnetic resonance. The aglycone part is a triterpene: 3 beta, 16 alpha, 23-trihydroxy-olean-12-en-28-oic acid or caulophyllogenin. Carbohydrate components are D-glucose, D-oxylose and L-rhamnose in a molar ratio 1:2:2. The structure of chrysantellin B was established as 3-O-beta-D-glucopyranosyl[L-rhamnopyranosyl-(alpha 1 leads to 3)-D-xylopyranosyl-(beta 1 leads to 4)-L-rhamnopyranosyl-(alpha 1 leads to 2)-D-xylopyranosyl-(beta 1 leads to 28)]caulophyllogenin

    A single-centre experience concerning the safety of Sprint Fidelis defibrillator lead extraction at the time of pulse generator replacement or in case of evidence of lead failure

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    SummaryBackgroundThe reported failure rate of the Sprint Fidelis defibrillator lead (SFDL) has increased more than initially expected, with emerging evidence of accelerating fracture rates. Current consensus guidelines continue to discourage prophylactic lead extraction, citing major complication rates of 1.4–7.3%. Therefore, data relating to the risks of systematic SFDL extraction are lacking, with no methodical extraction protocol reported to date. Moreover, few statistical analyses have identified predictors of SFDL failure.ObjectivesThe aims of this single-centre study were: to examine the safety and feasibility of systematic SFDL extraction at the time of pulse generator replacement or in case of lead failure; and to identify predictors of SFDL failure.MethodsBetween January 2005 and October 2007, 218 consecutive patients underwent transvenous SFDL implantation in our centre.ResultsDuring a mean follow-up of 43±15months, SFDL extraction was performed in 49 patients (22.5%) for the following reasons: inappropriate shocks (n=21; 9.6%), systematic extraction at time of pulse generator extraction (n=23; 10.5%), high impedance (n=3; 1.4%), high SFDL threshold (n=1; 0.4%) and cardiac device-related infection (n=1; 0.4%). No severe complications occurred, although two minor complications were reported (lead dislodgments). SFDL fracture was observed in 25 patients (11.5%; 3.2%/year incidence). The only predictor associated with SFDL fracture was the number of leads (P=0.01).ConclusionIn our series, SFDL extraction at the time of pulse generator extraction or in case of evidence of lead failure was feasible and safe. Number of leads was identified as a new predictive factor for SFDL fracture

    U/Th diagram obtained from Isoplot program [21] with quotation of previous alpha spectrometer data at 2σ level.

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    <p>U/Th diagram obtained from Isoplot program [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0082394#B21" target="_blank">21</a>] with quotation of previous alpha spectrometer data at 2σ level.</p

    MIS and Orgnac infilling after U/Th and <sup>40</sup>Ar/<sup>39</sup>Ar dating.

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    <p>Stacked δ<sup>18</sup>O record of benthic foraminifera from [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0082394#B28" target="_blank">28</a>] after [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0082394#B29" target="_blank">29</a>] with modifications. The shaded vertical envelope (± 2σ) shows the occurrence of the Orgnac infilling after U/Th and <sup>40</sup>Ar/<sup>39</sup>Ar dating, close to the transition between MIS 8 and MIS 9.</p

    <sup>36</sup>Ar/<sup>40</sup>Ar vs <sup>39</sup>Ar/<sup>40</sup>Ar inverse isochron diagram

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    <p>for all the data (n=57) with ellipse error at 2σ excluding 14 samples (blue squares): 1) *samples too old (quoted with * in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0082394#pone-0082394-t002" target="_blank">Table 2</a>) (n=10); 2) K346-20, K346-11 with a too high <sup>39</sup>Ar/<sup>36</sup>Ar ratio and K346-21 with a negative <sup>36</sup>Ar/<sup>40</sup>Ar ratio because <sup>36</sup>Ar was underestimated; 3) K346-51 was eliminated otherwise the MSWD is 3.2 and the atmospheric ratio is not reached. </p
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