• Title, Summary, Keyword: Carbon Monoxide

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Synthesis of N-Substituted Isoindolin-1-ones via Palladium-Catalyzed Carbonylative Heterocyclization of o-Bromobenzylbromide with Carbon Monoxide and Primary Amines

  • 심상철;Li Hong Jiang;이동엽;조찬식
    • Bulletin of the Korean Chemical Society
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    • v.16 no.11
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    • pp.1064-1067
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    • 1995
  • A convenient method for the synthesis of N-substituted isoindolin-1-ones is disclosed in palladium(0)-catalyzed heterocyclization of o-bromobenzylbromide with carbon monoxide (CO) and primary amines in DMF at 100 ℃.

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Selective Sensing of Carbon Monoxide Gas in CuO banded ZnO Ceramics (CuO띠가 입혀진 ZnO 소결체의 일산화탄소에 대한 선택적 감지 특성)

  • 신병철
    • Journal of the Korean Ceramic Society
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    • v.30 no.10
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    • pp.819-822
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    • 1993
  • The purpose of this paper is a investigation of sensing mechanism for the carbon monoxide gas in CuO infiltrated ZnO ceramics. Potential barriers between CuO and ZnO can explain the selective sensing of carbon monoxide gas in the physically contacted CuO/ZnO ceramics. A specimen having no potential barrier between CuO and ZnO was prepared to see whether the gas sensing mechanism is related to the potential barrier. CuO and ZnO was prepared to see whether the gas sensing mechanism is related to the potential barrier. CuO was painted on the non electrode sides of ZnO ceramics. The CuO painted ZnO ceramics showed that the sensitivityfor the carbon moxnoxide gas was 1.3 times as high as that for the hydrogen gas. It is almost same gas sensitivity as that of the CuO infiltrated ZnO ceramics.

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Characterization of Graphene Sheets Formed by the Reaction of Carbon Monoxide with Aluminum Sulfide

  • Yoon, Il-Sun;Kim, Chang-Duk;Min, Bong-Ki;Kim, Young-Ki;Kim, Bong-Soo;Jung, Woo-Sik
    • Bulletin of the Korean Chemical Society
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    • v.30 no.12
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    • pp.3045-3048
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    • 2009
  • Graphene sheets formed by the reaction of carbon monoxide (CO) with aluminum sulfide ($Al_2S_3$) at reaction temperatures ${\leq}$ 800 $^{\circ}$ were characterized by X-ray diffraction (XRD), Raman spectroscopy, and high-resolution transmission electron microscopy (HRTEM). The graphene sheets, formed as CO was reduced to gaseous carbon by the reaction with $Al_2S_3$, in the temperature range 800 - 1100 $^{circ}C$, did not exhibit their characteristic XRD peaks because of the small number of graphene layers and/or low crystallinity of graphene sheets. Raman spectra of graphene sheets showed that the intensity ratio of the D band to the G band decreased and the 2D band was shifted to higher frequencies with increasing reaction temperature, indicating that the number of graphene layers increased with increasing reaction temperature.

Carbon monoxide releasing molecule-2 protects mice against acute kidney injury through inhibition of ER stress

  • Uddin, Md Jamal;Pak, Eun Seon;Ha, Hunjoo
    • The Korean Journal of Physiology and Pharmacology
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    • v.22 no.5
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    • pp.567-575
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    • 2018
  • Acute kidney injury (AKI), which is defined as a rapid decline of renal function, becomes common and recently recognized to be closely intertwined with chronic kidney diseases. Current treatment for AKI is largely supportive, and endoplasmic reticulum (ER) stress has emerged as a novel mediator of AKI. Since carbon monoxide attenuates ER stress, the objective of the present study aimed to determine the protective effect of carbon monoxide releasing molecule-2 (CORM2) on AKI associated with ER stress. Kidney injury was induced after LPS (15 mg/kg) treatment at 12 to 24 h in C57BL/6J mice. Pretreatment of CORM2 (30 mg/kg) effectively prevented LPS-induced oxidative stress and inflammation during AKI in mice. CORM2 treatment also effectively inhibited LPS-induced ER stress in AKI mice. In order to confirm effect of CO on the pathophysiological role of tubular epithelial cells in AKI, we used mProx24 cells. Pretreatment of CORM2 attenuated LPS-induced ER stress, oxidative stress, and inflammation in mProx24 cells. These data suggest that CO therapy may prevent ER stress-mediated AKI.

10 Cases of Hearing Loss due to CO Intoxication (급성 일산화탄소중독성 난청의 10례)

  • 김기령;김영명;김귀언;이만응
    • Proceedings of the KOR-BRONCHOESO Conference
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    • pp.3.2-3
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    • 1977
  • Deafness has been considered in recent publications a transient feature in the neurological complications of carbon monoxide poisoning. The inner ear is a sensitive as central nervous system to anoxia. It is well known a similar vulnerability to the toxic action of carbon monoxide for the two neurosensory epithelia of the organ of Corti. There is geographical character in the carbon monoxide poisoning and more frequently experienced in Korea. 10 cases of hearing loss due to carbon monoxide intoxication were reported with the literature review.

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A study on CO gas sensing Characteristics of Pt-SiC $SnO_2$-pt-SiC Schottky Diodes (Pt 및 Pt-$SnO_2$를 전극으로 하는 SiC 쇼트키 다이오드의 CO 가스 감응 특성)

  • Kim, C.K.;Noh, I.H.;Yang, S.J.;Lee, J.H.;Lee, J.H.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.805-808
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    • 2002
  • A carbon monoxide gas sensor utilizing Pt-SiC, Pt-SnO2-SiC diode structure was fabricated. Since the operating temperature for silicon devices in limited to 200oC, sensor which employ the silicon substrate can not at high temperature. In this study, CO gas sensor operating at high temperature which utilize SiC semiconductor as a substrate was developed. Since the SiC is the semiconductor with wide band gap. the sensor at above $700^{\circ}C$. Carbon monoxide-sensing behavior of Pt-SiC, Pt-SnO2-SiC diode is systematically compared and analyzed as a function of carbon monoxide concentration and temperature by I-V and ${\Delta}$I-t method under steady-state and transient conditions.

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Analysis of Tropospheric Carbon Monoxide using MOPITT data

  • Lee, Sang-Hee;Park, Gi-Hyuk;Lim, Hyo-Suk;Lee, Joo-Hee
    • Proceedings of the KSRS Conference
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    • pp.373-377
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    • 2002
  • The Measurement of Pollution in the Troposphere (MOPITT) instrument is an eight-channel gas correlation radiometer launched on the Earth Observing System (EOS) Terra spacecraft in 1999. Its main objectives are to measure carbon monoxide (CO) and methane (CH4) concentrations in the troposphere. This work analyzes tropospheric carbon monoxide distributions using MOPITT data in East Asia and compared ozone distributions. In general, seasonal CO variations are characterized by a spring peak and decreased in the summer. Also, this work revealed that the seasonal cycles of CO are spring maximum and summer minimum with averaged concentrations ranging from 118ppbv to 170ppbv. The CO monthly means show a similar profiles to those of O3. This fact clearly indicates that the high concentration of CO in spring is caused by two possible causes: the photochemical CO production in the troposphere, transport of the CO in the northeast Asia. The CO and O3 seasonal cycles in northeast Asia are influenced extensively by the seasonal exchange of the different types of air mass due to the Asian monsoon. The continental air masses contain high concentrations of O3 and CO due to higher continental background concentrations and sometimes due to the contribution of regional pollution. In summer the transport pattern is reversed. The Pacific marine air masses prevail over Korea, so that the marine air masses bring low concentrations of CO and O3, which tend to give the apparent minimum in summer.

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Nitric Oxide and Carbon Monoxide Emission from a Premixed Flame Stabilized in a Porous Ceramic Matrix Burner (세라믹 매트릭스 버너에 형성된 예혼합 화염의 NOx 및 CO 배출특성)

  • Jeong, Jong-Su;Lee, Gyo-U
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.20 no.10
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    • pp.3243-3250
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    • 1996
  • Emission characteristics of nitric oxides and carbon monoxide from a porous media combustor has been experiment studied. The relationship between the change of flame shape and emission has also been examined. As the equivalence ratio decreases, the flame shape on the ceramic matrix plate changes from a diffusion flame, R(radiant)-type flame, to B(Blue)-type flame. With large fuel flow rate, R-type flame turns to be two dimensional R-II type flame around the equivalence of 0.7. Carbon monoxide emission increases very rapid with decreasing equivalence ratio. It changes a lot from some 10 ppm to 100-10,000 ppm with the change of flame type from R-I to R-II type. Nitric oxide emission from the premixed burner is less than 25 ppm over all range of fuel flow rate, which is less than 20% of NOx emission from conventional gas burners.

Factors Associated with Delayed Neuropsychological Sequelae in Acute Carbon Monoxide Poisoning Patients Treated by Hyperbaric Oxygen (고압산소치료를 받은 급성 일산화탄소 중독 환자들에서 발생한 지연성 신경정신과학적 후유증 발생과 관계된 인자)

  • Lee, Dong-Ha;Choi, Woo-Ik
    • Journal of The Korean Society of Clinical Toxicology
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    • v.9 no.2
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    • pp.88-94
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    • 2011
  • Purpose: Delayed neuropsychological sequelae (DNS) commonly occurs after recovery from acute carbon monoxide poisoning. The aim of this article is to identify the factors associated with DNS development. Methods: We retrospectively evaluated patients, admitted to the medical center emergency department from June 2005 to March 2011, who were suffering from acute carbon monoxide (CO) poisoning. We categorized the patients into two groups - those with DNS, and those without DNS. Multiple regression analysis was performed to identify the factors related to manifestation of DNS. Results: Of the total one hundred fifty seven patients (157) recruited for the study, twenty two (22) developed DNS. Longer CO exposure times and lower GCS scores were positively associated with development of DNS symptoms. Conclusion: Our study identified two potential factors which are predictive of DNS development in CO intoxication, however, more studies are needed. Adequate follow-up after hospital discharge to monitor for and accurately identify manifestation of DNS, is also important.

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