206 research outputs found

    Electrochemical hydrogenation of enones using a proton- exchange membrane reactor: selectivity and utility

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    Electrochemical hydrogenation of enones using a proton-exchange membrane reactor is described. The reduction of enones proceeded smoothly under mild conditions to afford ketones or alcohols. The reaction occurred chemoselectively with the use of different cathode catalysts (Pd/C or Ir/C)

    Anesthetic management of a patient undergoing liver transplantation who had previous coronary artery bypass grafting using an in situ right gastroepiploic artery.

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    We describe successful anesthetic management during living-donor liver transplantation in a 63-year-old man with previous coronary artery bypass grafting (CABG) that employed an in situ right gastroepiploic artery (RGEA). Anesthesia was maintained with 1.5% isoflurane in air/oxygen and fentanyl. A five-lead electrocardiogram, transesophageal echocardiogram, and pacing pulmonary artery catheter evaluated cardiac function. A pacing wire was inserted through the catheter to prepare for intraoperative severe bradyarrhythmia. Olprinone and nicorandil were continuously infused to prevent decrease in coronary arterial blood flow and the collapse of cardiac function. Avoiding disruption of circulation to coronary arteries through injury or spasm of the RGEA graft and preparing for cardiac insufficiency during liver transplantation of a patient with previous CABG using an in situ RGEA is critical

    Does the Group Size during a Picture Book-reading Affect the Pre-school Children's Response?

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    The purpose of this study was to investigate the influence of group size on the response during a picture book-reading by the pre-school children. Five or six-year old children of kindergarten (N=28) were assigned to the "3 people" group and "8 people" group. The checklist was created from the responses observed during the picture book-reading. The checklist consisted of 16 responses categorized into 5 types, i.e., "utterance", "facial expression", "action", "gaze", and "response to other people" . Analysis of variance for each response, with group size ( "3 people" group, "8 people" group) and time section (first half, latter half) as independent variables, were performed. The main results were as follows: (1) The response to "see the child who talked" was higher in the "8 people" group than the "3-person" group, in the latter half. (2) The "laugh out loud" response was higher in the "8 people" group than the "3 people" group, in both the first half and the latter half. Based on these results, the features of each group size were discussed

    Electrochemical Synthesis of Thienoacene Derivatives: Transition‐Metal‐Free Dehydrogenative C−S Coupling Promoted by a Halogen Mediator

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    The first electrochemical dehydrogenative C−S bond formation leading to thienoacene derivatives is described. Several thienoacene derivatives were synthesized by dehydrogenative C−H/S−H coupling. The addition of nBu4NBr, which catalytically promoted the reaction as a halogen mediator, was essential

    A hard ionizing spectrum in z=3-4 Lyα emitters with intense [OIII] emission: Analogs of galaxies in the reionization era?

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    We present Keck/MOSFIRE spectra of the diagnostic nebular emission lines [O iii]λλ5007,4959, [O ii]λ3727, and Hβ for a sample of 15 redshift z≃3.1\mbox-3.7 Lyα emitters (LAEs) and Lyman break galaxies (LBGs). In conjunction with spectra from other surveys, we confirm earlier indications that LAEs have a much higher [O iii]/[O ii] line ratio than is seen in similar redshift LBGs. By comparing their distributions on a [O iii]/[O ii] versus R23 diagram, we demonstrate that this difference cannot arise solely because of their lower metallicities but most likely is due to a harder ionizing spectrum. Using measures of Hβ and recombination theory, we demonstrate, for a subset of our LAEs, that ξion—the number of Lyman continuum photons per UV luminosity—is indeed 0.2–0.5 dex larger than for typical LBGs at similar redshifts. Using photoionization models, we estimate the effect this would have on both [O iii]/[O ii] and R23 and conclude such a hard spectrum can only partially explain such intense line emission. The additional possibility is that such a large [O iii]/[O ii] ratio is in part due to density rather than ionization bound nebular regions, which would imply a high escape fraction of ionizing photons. We discuss how further observations could confirm this possibility. Clearly LAEs with intense [O iii] emission represent a promising analog of those z > 7 sources with similarly strong lines that are thought to be an important contributor to cosmic reionization
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