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Hybrid modeling for carbon monoxide gas-phase catalytic coupling to synthesize dimethyl oxalate process
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作者 Shida Gao Cuimei Bo +3 位作者 Chao Jiang Quanling Zhang Genke Yang Jian Chu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第6期234-250,共17页
Ethylene glycol(EG)plays a pivotal role as a primary raw material in the polyester industry,and the syngas-to-EG route has become a significant technical route in production.The carbon monoxide(CO)gas-phase catalytic ... Ethylene glycol(EG)plays a pivotal role as a primary raw material in the polyester industry,and the syngas-to-EG route has become a significant technical route in production.The carbon monoxide(CO)gas-phase catalytic coupling to synthesize dimethyl oxalate(DMO)is a crucial process in the syngas-to-EG route,whereby the composition of the reactor outlet exerts influence on the ultimate quality of the EG product and the energy consumption during the subsequent separation process.However,measuring product quality in real time or establishing accurate dynamic mechanism models is challenging.To effectively model the DMO synthesis process,this study proposes a hybrid modeling strategy that integrates process mechanisms and data-driven approaches.The CO gas-phase catalytic coupling mechanism model is developed based on intrinsic kinetics and material balance,while a long short-term memory(LSTM)neural network is employed to predict the macroscopic reaction rate by leveraging temporal relationships derived from archived measurements.The proposed model is trained semi-supervised to accommodate limited-label data scenarios,leveraging historical data.By integrating these predictions with the mechanism model,the hybrid modeling approach provides reliable and interpretable forecasts of mass fractions.Empirical investigations unequivocally validate the superiority of the proposed hybrid modeling approach over conventional data-driven models(DDMs)and other hybrid modeling techniques. 展开更多
关键词 carbon monoxide Dynamic modeling Hybrid model Reaction kinetics Semi-supervised learning
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Absolute partial and total ionization cross sections of carbon monoxide with electron collision from 350 eV to 8000 eV
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作者 Taj Wali Khan 黄伟哲 +2 位作者 王恩亮 单旭 陈向军 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第4期459-464,共6页
The absolute partial and total cross sections for electron impact ionization of carbon monoxide are reported for electron energies from 350 eV to 8000 eV.The product ions(CO^(+),C^(+),O^(+),CO^(2+),C^(2+),and O^(2+))a... The absolute partial and total cross sections for electron impact ionization of carbon monoxide are reported for electron energies from 350 eV to 8000 eV.The product ions(CO^(+),C^(+),O^(+),CO^(2+),C^(2+),and O^(2+))are measured by employing an ion imaging mass spectrometer and two ion-pair dissociation channels(C^(+)+O^(+)and C^(2+)+O^(+))are identified.The absolute cross sections for producing individual ions and their total,as well as for the ion-pair dissociation channels are obtained by normalizing the data of CO^(+)to that of Ar^(+)from CO-Ar mixture target with a fixed 1:1 ratio.The overall errors are evaluated by considering various kinds of uncertainties.A comprehensive comparison is made with the available data,which shows a good agreement with each other over the energy ranges that are overlapped.This work presents new cross-section data with electron energies above 1000 eV. 展开更多
关键词 electron impact ionization cross sections carbon monoxide ion imaging mass spectrometer
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Carbon Monoxide Modulates Auxin Transport and Nitric Oxide Signaling in Plants under Iron Deficiency Stress
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作者 Kaiyue Hong Yasmina Radani +2 位作者 Waqas Ahmad Ping Li Yuming Luo 《Phyton-International Journal of Experimental Botany》 SCIE 2024年第1期45-61,共17页
Carbon monoxide(CO)and nitric oxide(NO)are signal molecules that enhance plant adaptation to environmental stimuli.Auxin is an essential phytohormone for plant growth and development.CO and NO play crucial roles in mo... Carbon monoxide(CO)and nitric oxide(NO)are signal molecules that enhance plant adaptation to environmental stimuli.Auxin is an essential phytohormone for plant growth and development.CO and NO play crucial roles in modulating the plant’s response to iron deficiency.Iron deficiency leads to an increase in the activity of heme oxygenase(HO)and the subsequent generation of CO.Additionally,it alters the polar subcellular distribution of Pin-Formed 1(PIN1)proteins,resulting in enhanced auxin transport.This alteration,in turn,leads to an increase in NO accumulation.Furthermore,iron deficiency enhances the activity of ferric chelate reductase(FCR),as well as the expression of the Fer-like iron deficiency-induced transcription factor 1(FIT)and the ferric reduction oxidase 2(FRO2)genes in plant roots.Overexpression of the long hypocotyl 1(HY1)gene,which encodes heme oxygenase,or the CO donor treatment resulted in enhanced basipetal auxin transport,higher FCR activity,and the expression of FIT and FRO2 genes under Fe deficiency.Here,a potential mechanism is proposed:CO and NO interact with auxin to address iron deficiency stress.CO alters auxin transport,enhancing its accumulation in roots and up-regulating key iron-related genes like FRO2 and IRT1.Elevated auxin levels affect NO signaling,leading to greater sensitivity in root development.This interplay promotes FCR activity,which is crucial for iron absorption.Together,these molecules enhance iron uptake and root growth,revealing a novel aspect of plant physiology in adapting to environmental stress. 展开更多
关键词 carbon monoxide nitric oxide AUXIN iron deficiency signal molecule PLANTS
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Effects of Chlorine and Chlorine Monoxide on Stratospheric Ozone Depletion 被引量:1
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作者 Laurie Wei Ibraheem Alelmi Sen Nieh 《Atmospheric and Climate Sciences》 2024年第1期136-153,共18页
This paper presents a system approach of mass balance calculations of ozone and other species under diffusion-convection-reaction processes to study the impacts of major ozone-depleting chemicals, chlorine (Cl) and ch... This paper presents a system approach of mass balance calculations of ozone and other species under diffusion-convection-reaction processes to study the impacts of major ozone-depleting chemicals, chlorine (Cl) and chlorine monoxide (ClO), and the effect of photolysis on ozone concentrations, ozone depletion, total ozone abundance, and ozone layer along the altitude in the stratosphere. The calculated ozone concentrations and profile of the layer followed a similar trend and were generally in good agreement with the measurements above the tropical area. The calculated peak of the layer was at the same mid-stratosphere at Z = 30 km with a peak concentration and total ozone abundance about 20% higher than the measured peak concentration of 8.0 ppm and total abundance of 399 DU. In the presence of Cl and ClO, the calculated ozone concentrations and total abundance were substantially reduced. Cl generally depleted more uniformly of ozone across the altitude, while ClO reduced substantially the ozone in the upper stratosphere and thus shifted the peak of the layer to a much lower elevation at Z = 14 km. Although both ClO and Cl are active ozone-depleting chemicals, ClO was found to have a more pronounced impact on ozone depletion and distribution than Cl. The possible explanations of these interesting phenomena were discussed and elaborated. The approach and calculations in this paper were shown to be useful in providing an initial insight into the structure and behavior of the complex ozone layer. 展开更多
关键词 OZONE Ozone Depletion CHLORINE Chlorine monoxide PHOTOLYSIS Dobson Unit
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Sub-2 nm mixed metal oxide for electrochemical reduction of carbon dioxide to carbon monoxide
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作者 Devina Thasia Wijaya Andi Haryanto +2 位作者 Hyun Woo Lim Kyoungsuk Jin Chan Woo Lee 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第9期303-310,共8页
Mixed metal oxide(MMO) represents a critical class of materials that can allow for obtaining a dynamic interface between its components:reduced metal and its metal oxide counterpart during an electrocatalytic reaction... Mixed metal oxide(MMO) represents a critical class of materials that can allow for obtaining a dynamic interface between its components:reduced metal and its metal oxide counterpart during an electrocatalytic reaction.Here,a synthetic method utilizing a MOF-derived micro/mesoporous carbon as a template to prepare sub-2 nm MMO catalysts for CO_(2) electro reduction is reported.Starting from the zeolite imidazolate framework(ZIF-8),the pyrolyzed derivatives were used to synthesize sub-2 nm Pd-Ni MMO with different compositions.The Ni-rich(Pd_(20)-Ni_(80)/ZC) catalyst exhibits unexpectedly superior performance for CO production with an improved Faradaic efficiency(FE) of 95.3% at the current density of 200 mA cm^(-2) at-0.56 V vs.reversible hydrogen electrode(RHE) compared to other Pd-Ni compositions.X-ray photoelectron spectroscopy(XPS) analysis confirms the presence of Ni^(2+) and Pd^(2+) in all compositions,demonstrating the presence of MMO.Density functional theory(DFT) calculation reveals that the lower CO binding energy on the surface of the Pd_(20)-Ni_(80) cluster eases CO desorption,thus increasing its production.This work provides a general synthetic strategy for MMO electrocatalysts and can pave a new way for screening multimetallic catalysts with a dynamic electrochemical interface. 展开更多
关键词 carbon dioxide reduction Mixed metal oxide NANOALLOY carbon monoxide Metal-organic framework
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Carbon Monoxide and Respiratory Disorders in Professional Female Fish Smokers at 2 Artisanal Sites in Benin
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作者 Mênonli Adjobimey Ibrahim Mama Cissé +6 位作者 Fintani Kaki Mariano Steven Sagbohan Perside Fabien Gounongbe Rose Mikponhoue Ayélo Paul Vikkey Hinson 《Occupational Diseases and Environmental Medicine》 2023年第4期175-186,共12页
Introduction: The use of biomass for cooking is a very common practice in Africa and Benin, and is associated with exposure to organic pollutants. The aim of this study was to assess carbon monoxide exposure and respi... Introduction: The use of biomass for cooking is a very common practice in Africa and Benin, and is associated with exposure to organic pollutants. The aim of this study was to assess carbon monoxide exposure and respiratory disorders in women at artisanal fish-smoking sites. Methods: This was a cross-sectional study of women fish smokers at two artisanal fish-smoking sites in Benin. Recruitment was exhaustive. An interview using a respiratory questionnaire inspired by the Union questionnaire, spirometry and carbon monoxide (CO) measurement were carried out. Descriptive analysis and comparison of means using Student’s t-test with a threshold of p = 0.05 were performed. Results: The median age of the 81 people surveyed was 40, with an interquartile range (IQT) of [25 to 75]. The median duration of daily exposure to smoke was 6 h IQT [4, 7]. Of those surveyed, 64 (79.01%) were illiterate and 39 (48.24%) had been working for 20 years. CO levels at the start of activity varied from 89 to 145 ppm in one case and from 40 to 89 ppm in the other. Respiratory symptoms were present in 19 (23.46%);18 (22.22%) had mild airway impairment on spirometry. There was a statistically significant decrease between the mean values of peak expiratory flow (PEF), mean expiratory volume in seconds (FEV1) and forced vital capacity (FVC) before and after exposure to smoke. Conclusion: CO levels are high on fish smoking sites and respiratory problems are common. Improved working conditions are important for these women. 展开更多
关键词 Respiratory Symptoms SPIROMETRY carbon monoxide Fish Smoking Women
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Association of carbon monoxide poisonings and carboxyhemoglobin levels with COVID-19 and clinical severity
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作者 Abuzer Coskun Burak Demirci Kenan Ahmet Turkdogan 《World Journal of Methodology》 2023年第4期248-258,共11页
BACKGROUND Coronavirus disease 2019(COVID-19),which recently spread throughout the entire world,is still a significant health issue.Additionally,the most common cause of risky poisoning in emergency services is carbon... BACKGROUND Coronavirus disease 2019(COVID-19),which recently spread throughout the entire world,is still a significant health issue.Additionally,the most common cause of risky poisoning in emergency services is carbon monoxide(CO)poisoning.Both disorders seem to merit more research as they have an impact on all bodily systems via the lungs.AIM To determine how arterial blood gas and carboxyhemoglobin(COHb)levels affect the clinical and prognostic results of individuals requiring emergency treatment who have both COVID-19 and CO poisoning.METHODS Between January 2018 and December 2021,479 CO-poisoning patients participated in this single-center,retrospective study.Patients were primarily divided into two groups for analysis:Pre-pandemic and pandemic periods.Additionally,the pandemic era was divided into categories based on the presence of COVID-19 and,if present,the clinical severity of the infection.The hospital information system was used to extract patient demographic,clinical,arterial blood gas,COVID-19 polymerase chain reaction,and other laboratory data.RESULTS The mean age of the 479 patients was 54.93±11.51 years,and 187(39%)were female.226(47%)patients were in the pandemic group and 143(30%)of them had a history of COVID-19.While the mean potential of hydrogen(pH)in arterial blood gas of all patients was 7.28±0.15,it was 7.35±0.10 in the pre-pandemic group and 7.05±0.16 in the severe group during the pandemic period(P<0.001).COHb was 23.98±4.19%in the outpatients and 45.26%±3.19%in the mortality group(P<0.001).Partial arterial oxygen pressure(PaO2)was 89.63±7.62 mmHg in the pre-pandemic group,and 79.50±7.18 mmHg in the severe group during the pandemic period(P<0.001).Despite the fact that mortality occurred in 35(7%)of all cases,pandemic cases accounted for 30 of these deaths(85.7%)(P<0.001).The association between COHb,troponin,lactate,partial arterial pressure of carbon dioxide,HCO3,calcium,glucose,age,pH,PaO2,potassium,sodium,and base excess levels in the pre-pandemic and pandemic groups was statistically significant in univariate linear analysis.CONCLUSION Air exchange barrier disruption caused by COVID-19 may have pulmonary consequences.In patients with a history of pandemic COVID-19,clinical results and survival are considerably unfavorable in cases of CO poisoning. 展开更多
关键词 Emergency department Coronavirus disease 2019 carbon monoxide MORTALITY CARBOXYHEMOGLOBIN INTOXICATION POISONING
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Nitrogen Dioxide, Carbon Monoxide, Natural and Anthropomorphic Effects, and Earth’s Changing Climate
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作者 Shreyas Banaji 《Atmospheric and Climate Sciences》 CAS 2023年第1期62-71,共10页
This study will both compare and contrast the characteristics and roles of two pollutants: nitrogen dioxide and carbon monoxide. It will begin by tracing each gas’ negative contributions to the Earth’s spheres, as w... This study will both compare and contrast the characteristics and roles of two pollutants: nitrogen dioxide and carbon monoxide. It will begin by tracing each gas’ negative contributions to the Earth’s spheres, as well as relate any negative links that each plays concerning human activity, health, and interaction with the environment. It will include an in-depth analysis of what the proliferation of such toxic gases indicates about human production and causality, plus reflect on any current attempts being made to improve the effects of these pollutants on the environment. This examination will also inspect three NASA missions, i.e., MOPITT/Terra, AIRS/Aqua, and OMI/Aura, the aim of which, among many other tasks, is to detect pollutants within the Earth’s various spheres, as well as analyze weather anomalies, improve prediction methodology, and chronicle meteorological patterns for future study. It will also cover some of the goals, engineering breakthroughs, and in one case, the limitations, of these three satellite missions. Finally, it should be noted that in all stages of this discussion, the author’s main aim will be to focus on the positives that need to be implemented in order to improve the current situations that both anthropogenic and natural disasters have created for the planet. 展开更多
关键词 carbon monoxide Nitrogen Dioxide Climate Change ATMOSPHERE Greenhouse Gases
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Intracardiac Thrombosis Secondary to the Silent Killer: A Case Report about Monoxide Carbon Poisoning in a Child
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作者 Madiha Benhachem Mariem Labrahimi +3 位作者 Aziza Elouali Ayyad Ghannam Maria Rkain Abdeladim Babakhouya 《Open Journal of Pediatrics》 2023年第4期502-506,共5页
Carbon monoxide (CO) poisoning is a frequent cause of emergency room admissions, especially during winter days, the symptoms are varied ranging from a simple headache to a serious cardiac and neurological impairment t... Carbon monoxide (CO) poisoning is a frequent cause of emergency room admissions, especially during winter days, the symptoms are varied ranging from a simple headache to a serious cardiac and neurological impairment that can be deadly. Diagnosis is based on the circumstances of occurrence as well as the dosage of carboxyhemoglobin in the blood. Exposure to CO has serious consequences, neurological and cardiac manifestations are not negligible and vary from repolarization disorders to heart attack. Treatment is urgent with normobaric or hyperbaric oxygen therapy. We report a case of a 2-year male child admitted to the emergency room for CO intoxication with an intracardiac thrombus subsequently complicated by an ischemic stroke with a fatal outcome in order to highlight this complication rarely described in literature. 展开更多
关键词 carbon monoxide (CO) POISONING Intracardiac Thrombosis CHILD
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Unintentional Carbon Monoxide Poisoning Outbreak from 2 to 9 October 2019 in Ulaanbaatar, Mongolia
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作者 Oyun-Erdene Otgonbyamba Enkhjargal Altangerel +5 位作者 Gantuya Ganbat Bilguun Ganbold Ariuntugs Sodnomjamts Bataa Chuluunbaatar Burmaajav Badrakh Suvd Batbaatar 《Occupational Diseases and Environmental Medicine》 2023年第2期97-114,共18页
Carbon monoxide poisoning (COP) from 2 to 9 October 2019 was a major public health concern in Ulaanbaatar, Mongolia, after a transition from consumption of raw coal to upgraded briquette fuel. During the period, a tot... Carbon monoxide poisoning (COP) from 2 to 9 October 2019 was a major public health concern in Ulaanbaatar, Mongolia, after a transition from consumption of raw coal to upgraded briquette fuel. During the period, a total of 186 residents, which is 16 times more than the previous years, were exposed to COP and 6 persons died at home. We conduct a cross-sectional study by using registration data and medical history of all hospitalized patients with a diagnosis of COP from 2 to 9 October 2019 and had an in-depth interview. 144 (77.4%) people from 85 households registered as potential cases and 124 (86.1%) people were diagnosed with COP. All households used upgraded briquettes, and 41 households (48.2%) used them for the first time. In 50% of cases, the stove was broken, the chimney was short, not heated, and the clay joint connecting the wall stove was broken. The majority of interviewees were unaware of COP and improperly used briquettes, and the safety of chimneys and stoves was insufficient which caused unintentional COP. It is necessary to provide information to the local population about the potential risks of COP, install CO alarms in households, and educate the population. In further, a well-established poisoning surveillance system is an important aspect of public health emergency preparedness in Mongolia. 展开更多
关键词 carbon monoxide Poisoning Survey Analysis Ulaanbaatar Mongolia
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Prevalence of Acute Myocardial and Brain Toxicity in Emergency Department Patients Exposed to Carbon Monoxide
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作者 Carolina Zúñiga Luisa Fabiola Pérez Moreno +1 位作者 Shirley Liperguer Verónica Torres Cerino 《Open Journal of Emergency Medicine》 2023年第4期198-205,共8页
Introduction: Due to its severe toxicity, carbon monoxide poisoning is an emergency that leads to cardiac and brain involvement, and emergency physicians should aim to master this diagnosis. This study is intended to ... Introduction: Due to its severe toxicity, carbon monoxide poisoning is an emergency that leads to cardiac and brain involvement, and emergency physicians should aim to master this diagnosis. This study is intended to describe the expected prevalence of these severe toxicities in the emergency department. Materials and Methods: A retrospective cohort of consecutive patients over 16 years of age presenting with carbon monoxide poisoning to the emergency department of the Hospital Universitario Austral, Argentina, during the period from January 2018 to June 2022. The prevalence of myocardial and brain toxicity was assessed regarding percentage, continuous variables with mean and standard deviation, categorical variables with percentage and absolute frequency. Positive findings of acute neurological toxicity included seizures, syncope and coma, while cardiovascular toxicity encompassed acute myocardial infarction (MI) diagnosed by electrocardiogram or elevated troponin levels, arrhythmias, and the development of pulmonary edema/ congestive heart failure (CHF) confirmed by chest X-ray with suggestive signs or clinically compatible symptoms. Patients were followed-up for 90 days to estimate hospitalization and mortality. Results: A total of 67 patients were evaluated;44.77% of them were males with a mean age of 38.5 ± 14.97 years. The prevalence of acute myocardial toxicity was 7.46% (n: 5). Among these patients, 3 had overweight as a risk factor, and 3 showed ECG abnormalities with negative T-waves. The prevalence of acute brain toxicity was 8.9% (n: 6). In total, 37% (n: 25) of patients met the criteria for hyperbaric oxygen therapy, of which 32% (n: 8) underwent more than one session. A total of 7.46% of patients (n: 5) required hospitalization. Mortality at 90 days was 0%. Conclusion: Among the patients who presented to the emergency department, the prevalence of acute myocardial toxicity was 7.46% (n: 5), which is lower than the prevalence reported in other studies to date. The prevalence of acute brain toxicity was 8.9% (n: 6), and there are no studies describing the prevalence of acute brain toxicity in the emergency department to date. There were no fatalities in our series. 展开更多
关键词 carbon monoxide Poisoning Myocardial Toxicity Brain Toxicity Hospital Universitario Austral
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Non-isothermal reduction kinetics of Fe_2O_3-NiO composites for formation of Fe-Ni alloy using carbon monoxide 被引量:3
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作者 李博 魏永刚 王华 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第11期3710-3715,共6页
The non-isothermal reduction kinetics and mechanism of Fe2O3-NiO composites with different Fe2O3-NiO compacts using carbon monoxide as reductant were investigated. The results show that the reduction degree increases ... The non-isothermal reduction kinetics and mechanism of Fe2O3-NiO composites with different Fe2O3-NiO compacts using carbon monoxide as reductant were investigated. The results show that the reduction degree increases rapidly with increasing the content of NiO, and the presence of NiO also improves the reduction rate of iron oxides. It is found that NiO is preferentially reduced at the beginning of the reactions, and then the metallic Ni acts as a catalyst promoting the reduction rate of iron oxides. It is also observed that the increase of the Ni O content enhances the formation of awaruite(FeNi3) but decreases the percentage of kamacite(Fe,Ni) and taenite(Fe,Ni). The particle size of the materials tends to be uniform during the reduction process due to the presence of metallic nickel, metallic iron and the formation of Fe-Ni alloy. The concentration of CO in the product gas is greater than that of CO2 at the beginning of the reaction and then slows down. The fastest reduction rate of Fe2O3-NiO composites with CO appears at 400-500 °C, and nucleation growth model can be used to elucidate the reduction mechanism. Nucleation growth process is found to be the rate controlling step when the temperature is lower than 1000 °C. 展开更多
关键词 reduction kinetics FE2O3 NIO Fe-Ni alloy carbon monoxide
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Selective reduction of carbon dioxide to carbon monoxide over Au/CeO_2 catalyst and identification of reaction intermediate 被引量:1
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作者 朱晓兵 曲新 +4 位作者 李小松 刘景林 刘剑豪 朱斌 石川 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第12期2053-2058,共6页
CO2 selective reduction to CO with H2 over a CeO2-supported nano-Au catalyst at atmospheric pres- sure was investigated. A high CO2 conversion, approaching the thermodynamic equilibrium value, and nearly 100% CO selec... CO2 selective reduction to CO with H2 over a CeO2-supported nano-Au catalyst at atmospheric pres- sure was investigated. A high CO2 conversion, approaching the thermodynamic equilibrium value, and nearly 100% CO selectivity were obtained. The surface formate intermediates generated during the reverse water-gas shift reaction at 400 ℃ were identified using in situ diffuse-reflectance infra- red Fourier-transform spectroscopy. The formate consumption to give CO and H20, determined using mass spectrometry, indicated that the reaction proceeded via an associative formate mecha- nism; this contributes to the high Au/CeO2 catalytic activity at low temperatures. 展开更多
关键词 CO2 reductionAu/CeO2 catalystcarbon monoxide Formate intermediate In situ DRIFT spectroscopy
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A Dual Wavelength Differential First Derivative Spectrophotometric Method for Identification and Determination of Carbon Monoxide Generated During the Microsomal Metabolism of Xenobiotics in vitro
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作者 徐宏祥 刘志强 《Journal of Chinese Pharmaceutical Sciences》 CAS 1997年第2期51-56,共6页
A dual wavelength differential first derivative spectrophotometric method has been developed to standardize the concentration of a saturated aqueous solution of carbon monoxide (CO) as the standard and to identify and... A dual wavelength differential first derivative spectrophotometric method has been developed to standardize the concentration of a saturated aqueous solution of carbon monoxide (CO) as the standard and to identify and to determine CO formed during the microsomal metabolism of xenobiotics in vitro. The method can significantly eliminate the background interference in the assay media and increase the quantitative accuracy and the sensitivity. There is a good linear relationship between CO concentration in the range of 2~10 μmol·L 1 CO and the distance D between the first derivative peak at 415 nm amd valley at 426 nm with r=0.9999(n=5),the regression equation being C (mmol·L 1 )=17.6D 0.4, the detection limit lower than 0.1 μmol·L 1 CO. The average recoveries of CO from the assay system and the sample were 102.1%, RSD=2.9% (n=7) and 79.7%, RSD=6.8% (n=12),respectively. The RSD of within day was 4.4%(n=18),and the RSD of day to day was 6.1%(n=16). By this method, four trihaloanilines and one trihalobenzene were tested, the results showed that only 2,4,5 trifluoroaniline could be converted to CO by the incubation with rat hepatic microsomes, NADPH and oxygen, the ability of phenobarbital or dexamethasone to induce rat hepatic microsomes to catalyze CO formation was 3 or 8 times higher than that of the control. 展开更多
关键词 Dual wavelength differential first derivative spectrophotometry carbon monoxide Trifluoroaniline Drug metabolism Hepatic microsomes Cytochrome P 450
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PROTECTION OF CARBON MONOXIDE INHALATION ON LIPOPOLY-SACCHARIDE-INDUCED MULTIPLE ORGAN INJURY IN RATS 被引量:9
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作者 Shao-hua Liu Xin-rong Xu Ke Ma Bing Xu 《Chinese Medical Sciences Journal》 CAS CSCD 2007年第3期169-176,共8页
Objective To observe the protection of carbon monoxide (CO) inhalation on lipopolysaccharide (LPS)-induced rat multiple organ injury. Methods Sprague-Dawley rats with multiple organ injury induced by 5 mg/kg LPS i... Objective To observe the protection of carbon monoxide (CO) inhalation on lipopolysaccharide (LPS)-induced rat multiple organ injury. Methods Sprague-Dawley rats with multiple organ injury induced by 5 mg/kg LPS intravenous injection were exposed to room air or 2.5 × 10 ^-4 (V/V) CO for 3 hours. The lung and intestine tissues of rats were harvested to measure the expression of heme oxygenase-1 ( HO-1 ) with reverse transcription-polymerase chain reaction, the levels of pulmonary tumor necrosis factor-or ( TNF-α), interleukin-6 ( IL-6), and intestinal platelet activator factor ( PAF), intercellular adhesion molecule-1 (ICAM-1) with enzyme-linked immunosorbent assay, the content of maleic dialdehyde (MDA) and the activity of myeloperoxidase (MPO) with chemical method, the cell apoptosis rate with flow cytometry, and the pathological changes with light microscope. Results CO inhalation obviously up-regulated the expression of HO-1 in lung (5.43 ± 0. 92) and intestine (6. 29 ± 1.56) in LPS + CO group compared with ( 3.08 ± 0. 82) and ( 3.97 ± 1.16 ) in LPS group ( both P 〈 0. 05 ). The levels of TNF-ot, IL-6 in lung and PAF, ICAM-1 in intestine ofLPS + CO group were 0. 91 ±0. 25,0. 64 ±0.05, 1. 19 ± 0. 52, and 1.83 ±0. 35 pg/mg, respectively, significantly lower than the corresponding values in LPS group ( 1.48 ± 0. 23, 1.16 ± 0. 26, 1.84 ± 0. 73, and 3.48 ± 0. 36 pg/mg, all P 〈 0. 05 ). The levels of MDA, MPO, and cell apoptosis rate in lung and intestine of LPS + CO group were 1.02 ± 0. 23 nmol/mg, 1.74 ± 0. 17 nmol/mg, 7.18 ± 1.62 U/mg, 6. 30 ±0. 97 U/mg, 1.60% ±0. 34%, and 30. 56% ±6. 33%, respectively, significantly lower than the corresponding values in LPS group ( 1.27 ± 0. 33 nmol/mg, 2. 75 ± 0. 39 nmol/mg, 8. 16 ± 1.49 U/mg, 7. 72 ± 1.07 U/mg, 3.18% ±0. 51%, and 41.52% -+3.36%, all P 〈0.05). In addition, injury of lung and intestine induced by LPS was attenuated at presence of CO inhalation. Conclusion CO inhalation protects rat lung and intestine from LPS-induced injury via anti-oxidantion, anti-inflammation, anti-apoptosis, and up-regulation of HO-1 expression. 展开更多
关键词 carbon monoxide LUNG INTESTINE multiple organ injury
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Kinetic analysis of iron ore powder reaction with hydrogen-carbon monoxide 被引量:7
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作者 Xudong Mao Pritesh Garg +4 位作者 Xiaojun Hu Yuan Li Samik Nag Saurabh Kundu Jianliang Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2022年第10期1882-1890,共9页
Iron ore powder was isothermally reduced at 1023-1373 Kwith hydrogen/carbon monoxide gas mixture(from 0vol%H_(2)/100vol%CO to 100vol%H_(2)/0vol%CO).Results indicated that the whole reduction process could be divided i... Iron ore powder was isothermally reduced at 1023-1373 Kwith hydrogen/carbon monoxide gas mixture(from 0vol%H_(2)/100vol%CO to 100vol%H_(2)/0vol%CO).Results indicated that the whole reduction process could be divided into two parts that proceed in series.The first part represents a double-step reduction(Fe_(2)O_(3)→Fe_(3)O_(4)→FeO),in which the kinetic condition is more feasible compared with that in the second part representing a single-step reduction(FeO→Fe).The influence of hydrogen partial pressure on the reduction rate gradually increases as the reaction proceeds.The average reduction rate of hematite ore with pure hydrogen is about three and four times higher than that with pure carbon monoxide at 1173 and 1373 K,respectively.In addition,the logarithm of the average rate is linear to the composition of the gas mixture.Hydrogen can prominently promote carbon deposition to about 30%at 1023 K.The apparent activation energy of the reduction stage increases from about 35.0 to 45.4 kJ/mol with the increase in hydrogen content from 20vol%to 100vol%.This finding reveals that the possible rate-controlling step at this stage is the combined gas diffusion and interfacial chemical reaction. 展开更多
关键词 REDUCTION carbon monoxide HYDROGEN KINETICS MECHANISM
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Acute carbon monoxide poisoning and delayed neurological sequelae: a potential neuroprotection bundle therapy 被引量:12
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作者 Sungho Oh Sang-Cheon Choi 《Neural Regeneration Research》 SCIE CAS CSCD 2015年第1期36-38,共3页
Currently, there is no known optimal therapy for carbon monoxide (CO) poisoning and CO-associated delayed neu- rological sequelae. Hyperbaric oxygen therapy (HBOT) is a well-known treatment method, but its use for... Currently, there is no known optimal therapy for carbon monoxide (CO) poisoning and CO-associated delayed neu- rological sequelae. Hyperbaric oxygen therapy (HBOT) is a well-known treatment method, but its use for CO poison- ing patients is controversial to use due to lack of evidences regarding its efficacy. Thus, it is unlikely that HBOT alone will be accepted as the standard treatment method. In this article, current and potential treatment methods of CO poi- soning are presented as well as the tentative multi-factorial pathophysiology. A series of treatments are suggested for use as a bundle therapy, with targeted temperature management as the base treatment method. Such a therapy holds a great potential, especially for the cases where HBOT is not readily available. We suggest further investigations for elucidating the effects of these suggested treatments and their roles in terms of the complex pathophysiology of CO poisoning. Future ac- ceptance of this therapy based on the improved scientific and clinical knowledge may result in injury prevention and mini- mization of the signs and the symptoms in CO poisoning. 展开更多
关键词 HBOT a potential neuroprotection bundle therapy Acute carbon monoxide poisoning and delayed neurological sequelae
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Autumn Photoproduction of Carbon Monoxide in Jiaozhou Bay, China 被引量:6
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作者 REN Chunyan YANG Guipeng LU Xiaolan 《Journal of Ocean University of China》 SCIE CAS 2014年第3期428-436,共9页
Carbon monoxide(CO) plays a significant role in global warming and atmospheric chemistry. Global oceans are net natural sources of atmospheric CO. CO at surface ocean is primarily produced from the photochemical degra... Carbon monoxide(CO) plays a significant role in global warming and atmospheric chemistry. Global oceans are net natural sources of atmospheric CO. CO at surface ocean is primarily produced from the photochemical degradation of chromophoric dissolved organic matter(CDOM). In this study, the effects of photobleaching, temperature and the origin(terrestrial or marine) of CDOM on the apparent quantum yields(AQY) of CO were studied for seawater samples collected from Jiaozhou Bay. Our results demonstrat that photobleaching, temperature and the origin of CDOM strongly affected the efficiency of CO photoproduction. The concentration, absorbance and fluorescence of CDOM exponentially decreased with increasing light dose. Terrestrial riverine organic matter could be more prone to photodegradation than the marine algae-derived one. The relationships between CO AQY and the dissolved organic carbon-specific absorption coefficient at 254 nm for the photobleaching study were nonlinear, whereas those of the original samples were strongly linear. This suggests that: 1) terrestrial riverine CDOM was more efficient than marine algae-derived CDOM for CO photoproduction; 2) aromatic and olefinic moieties of the CDOM pool were affected more strongly by degradation processes than by aliphatic ones. Water temperature and the origin of CDOM strongly affected the efficiency of CO photoproduction. The photoproduction rate of CO in autumn was estimated to be 31.98 μmol m-2 d-1 and the total DOC photomineralization was equivalent to 3.25%- 6.35% of primary production in Jiaozhou Bay. Our results indicate that CO photochemistry in coastal areas is important for oceanic carbon cycle. 展开更多
关键词 carbon monoxide PHOTOPRODUCTION apparent quantum yield photobleaching CDOM
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Catalytic methanol decomposition to carbon monoxide and hydrogen over Pd/CeO_2-ZrO_2-La_2O_3 with different Ce/Zr molar ratios 被引量:6
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作者 Hairong Wang Yaoqiang Chen Qiulin Zhang Qingchao Zhu Maochu Gong Ming Zhao 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2009年第2期211-216,共6页
Hairong Wang, Yaoqiang Chen, Qiulin Zhang, Qingchao Zhu, Maochu Gong, Ming Zhao( Key Laboratory of Green Chemistry & Technology of Ministry Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichua... Hairong Wang, Yaoqiang Chen, Qiulin Zhang, Qingchao Zhu, Maochu Gong, Ming Zhao( Key Laboratory of Green Chemistry & Technology of Ministry Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China 展开更多
关键词 methanol decomposition PALLADIUM CeO2-ZrO2-La2O3 XPS HYDROGEN carbon monoxide
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Catalytic reduction of nitric oxide with carbon monoxide on copper-cobalt oxides supported on nano-titanium dioxide 被引量:6
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作者 CHEN Xia,ZHANG Junfeng,HUANG Yan,TONG Zhiquan,HUANG Ming Department of Environmental Engineering,Xiangtan University,Xiangtan 411105,China 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2009年第9期1296-1301,共6页
A series of copper-cobalt oxides supported on nano-titanium dioxide were prepared for the reduction of nitric oxide with carbon monoxide and characterized using techniques such as XRD, BET and TPR. Catalyst CuCoOx/TiO... A series of copper-cobalt oxides supported on nano-titanium dioxide were prepared for the reduction of nitric oxide with carbon monoxide and characterized using techniques such as XRD, BET and TPR. Catalyst CuCoOx/TiO2 with Cu/Co molar ratio of 1/2, CuCo total loading of 30% at the calcination temperature of 350℃ formed CuCo204 spinel and had the highest activity. NO conversion reached 98.9% at 200℃. Mechanism of the reduction was also investigated, N20 was mainly yielded below 100℃, while N2 was produced instead at higher temperature. O2 was supposed to accelerate the reaction between NOx and CO for its oxidation of NO to give more easily reduced NO2, but the oxidation of CO by O2 to CO2 decreased the speed of the reaction greatly. Either SO2 or H20 had no adverse impact on the activity of NO reduction; however, in the presence of both SO2 and H20, the catalyst deactivated quickly. 展开更多
关键词 CuCoOx/TiO2 carbon monoxide nitric oxide catalytic reduction
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