Hydrogen sulfide （H2S） is the third gaseous signaling molecule discovered in recent years, and plays an important physiological role in the cardivascular system. To explore the effects of different doses of exogenou...Hydrogen sulfide （H2S） is the third gaseous signaling molecule discovered in recent years, and plays an important physiological role in the cardivascular system. To explore the effects of different doses of exogenous H2S on the electrocardiogram （ECG） of rats generally anesthetized by zoletil, different doses of NariS solution were used for the intervention of intraperitoneal injection 20 rain before the zoletil anesthesia. The ECGs of rats from each treatment group during the time range of 10^th-50^th min were determined under general anesthesia, and then were compared with those from the control group. The results showed that exogenous H2S could significantly reduce the Q-T interval time limit, thus played a role in slowing tachycardia or arrhythmia and other anomalies, thereby protecting the heart. S-T segment and T segment evaluation values were significantly reduced, which might be associated with bradycardia.展开更多
Neuroinflammation has been recognized to play a critical role in the pathogenesis of Alzheimer＇s disease （AD）, which is pathologically characterized by the accumulation of senile plaques containing activated microg...Neuroinflammation has been recognized to play a critical role in the pathogenesis of Alzheimer＇s disease （AD）, which is pathologically characterized by the accumulation of senile plaques containing activated microglia and amyloid β-peptides （Aβ）. In the present study, we examined the neuroprotective effects of hydrogen sulfide （H2S） on neuroinflammation in rats with Aβ1-40 hippocampal injection. We found that Aβ-induced rats exhibited a disorder of pyramidal cell layer arrangement, and a decrease of mean pyramidal cell number in the CA1 hippocampal region compared with those in sham operated rats. NaHS （a donor of H2S, 5.6 mg/kg/d, i.p.） treatment for 3 weeks rescued neuronal cell death significantly. Moreover, we found that H2S dramatically suppressed the release of TNF-α, IL-1β and IL-6 in the hippocampus. Consistently, both immunohistochemistry and Western blotting assays showed that H2S inhibited the upregulation of COX-2 and the activation of NF-κB in the hippocampus. In conclusion, our data indicate that H2S suppresses neuroinflammation via inhibition of the NF-κB activation pathway in the Aβ-induced rat model and has potential value for AD therapy.展开更多
Objective To establish the mitral regurgitation swine model and study the change of hydrogen sulfide(H2S)system in chronic heart failure model.Methods Miniature pigs were randomly divided into two groups,the control g...Objective To establish the mitral regurgitation swine model and study the change of hydrogen sulfide(H2S)system in chronic heart failure model.Methods Miniature pigs were randomly divided into two groups,the control group(n=6)and mitral regurgitation group(n=6).Chronic heart failure models were established by pulling mitral chordal through a small incision extracorporeal.展开更多
The effect of H2S contents on the transformation of 1-hexene with hydrogen over NiMoS/γ-Al2O3 catalyst was investigated.Inhibition of H2S on both hydrogenation and isomerization reactions of olefin has been demonstra...The effect of H2S contents on the transformation of 1-hexene with hydrogen over NiMoS/γ-Al2O3 catalyst was investigated.Inhibition of H2S on both hydrogenation and isomerization reactions of olefin has been demonstrated.And the promotion effect of H2S on the formation of C6 thiols and C12 thioethers has also been observed.It was found out that there was only one type of active site on the NiMoS/γ-Al2O3 for reactions which include hydrogenation reaction,isomerization reaction and sulfides formation reaction,and the formation reactions of sulfides were superior to both hydrogenation and isomerization reactions.The reaction network for the conversion of 1-hexene in the presence of H2S was proposed.展开更多
The presence of a limited amount of H2S in H2-rich feed adversely affects the Pd-Cu membrane permeation performance due to the sulphidization of the membrane surface. A theoretical model was proposed to predict the S-...The presence of a limited amount of H2S in H2-rich feed adversely affects the Pd-Cu membrane permeation performance due to the sulphidization of the membrane surface. A theoretical model was proposed to predict the S-tolerant performance of the Pd-Cu membranes in presence of H2S under the industrial water-gas-shift(WGS) reaction conditions. The ideas of surface coverage and competitive adsorption thermodynamics of H2S and H2 on Pd-Cu surface were introduced in the model. The surface sulphidization of the Pd-Cu membranes mainly depended on the pressure ratio of H2S to H2, temperature and S-adsorbed surface coverage, i.e., the occurrence of sulphidization on the surface was not directly related with the bulk compositions and structures [body centered cubic and face centered cubic(bcc or fcc)] of Pd-Cu alloy membranes because of the surface segregation phenomena. The resulting equilibrium equations for the H2S adsorption/sulphidization reactions were solved to calculate the pressure ratio of H2S to H2 over a wide range of temperatures. A validation of the model was performed through a comparison between lots of literature data and the model calculations over a rather broad range of operating conditions. An extremely good agreement was obtained in the different cases, and thus, the model can serve to guide the development of S-resistant Pd alloy membrane materials for hydrogen separation.展开更多
With the aid of hydrogen permeating devices, the hydrogen permeation behaviors of X52 pipeline steel in NACE A solution with saturated H2S/CO2 were studied under the conditions of different ambient temperatures and pH...With the aid of hydrogen permeating devices, the hydrogen permeation behaviors of X52 pipeline steel in NACE A solution with saturated H2S/CO2 were studied under the conditions of different ambient temperatures and pH values, and the hydrogen permeation behaviors of X52 pipeline steel in weld seam zone were comparatively studied. The experimental results show that the hydrogen permeation coefficient value is directly proportional to the time required for reaching the saturation anode current and inversely proportional to the saturation anode current, and the hydrogen permeation coefficient is influenced by the corrosion scales; the temperature is directly proportional to the saturation anode current, and the hydrogen permeation coefficient is influenced by the temperature and corrosion scales, heat-affected zone and matrix zone in NACE A solution with saturated H2S/CO2 at normal temperature. The hydrogen permeation coefficient in weld seam zone is larger than that in heat-affected zone which is further larger than that in matrix zone.展开更多
A new intelligent amperometric type of electrochemical hydrogen probe to measure hydrogen atom permeation rate in the metals was devised and developed. Combined with MCS51 single slice computer system, specially progr...A new intelligent amperometric type of electrochemical hydrogen probe to measure hydrogen atom permeation rate in the metals was devised and developed. Combined with MCS51 single slice computer system, specially programmed software was designed for data sampling, logging, storing, processing, result judgment and data output controlling. The probe is portable and can be used in both lab and in site automatically.展开更多
Hydrogen sulfide is synthesized endogenously in mammals and has been shown to have both physiological and pathological functions. So far there has been little agreement as to the actual levels of endogenous sulfide un...Hydrogen sulfide is synthesized endogenously in mammals and has been shown to have both physiological and pathological functions. So far there has been little agreement as to the actual levels of endogenous sulfide under physiological or pathological conditions;this is partly due to the complexity involved in measuring free sulfides due to H2S volatility, oxidation, reactivity and the presence of bound labile sulfur in tissues. In this report we describe a method of measuring free tissue sulfides using a zinc sulfide precipitation and wash method. It is an indirect method that measures the sulfide difference between samples prepared at pH 9 and pH 6, assuming that at pH 9 free sulfides would be retained in solution, while at pH 6 free sulfides would volatilize during sample preparation. Using this approach we were able to measure appreciable amounts of free sulfides in mouse: lung, pancreas, liver and kidney at 0.036 + 0.006, 0.082 + 0.009, 0.215 + 0.016 and 0.323 + 0.031 nmole per mg of tissue respectively (n = 6).展开更多
为保障工作人员在硫化氢(H_(2)S)泄漏工况下的生命安全,以东南部海域某高含硫油田开发工程为例,结合国内第一艘圆筒形浮式生产储油卸油装置(Floating Production Storage and Offloading,FPSO)的结构特点,设计一种适用于高含H_(2)S油气...为保障工作人员在硫化氢(H_(2)S)泄漏工况下的生命安全,以东南部海域某高含硫油田开发工程为例,结合国内第一艘圆筒形浮式生产储油卸油装置(Floating Production Storage and Offloading,FPSO)的结构特点,设计一种适用于高含H_(2)S油气田的FPSO应急空气呼吸系统。研究表明:该空气呼吸系统安全可靠、占地面积小、使用方便。研究成果可为H_(2)S防护设计提供一定参考。展开更多
文摘Hydrogen sulfide （H2S） is the third gaseous signaling molecule discovered in recent years, and plays an important physiological role in the cardivascular system. To explore the effects of different doses of exogenous H2S on the electrocardiogram （ECG） of rats generally anesthetized by zoletil, different doses of NariS solution were used for the intervention of intraperitoneal injection 20 rain before the zoletil anesthesia. The ECGs of rats from each treatment group during the time range of 10^th-50^th min were determined under general anesthesia, and then were compared with those from the control group. The results showed that exogenous H2S could significantly reduce the Q-T interval time limit, thus played a role in slowing tachycardia or arrhythmia and other anomalies, thereby protecting the heart. S-T segment and T segment evaluation values were significantly reduced, which might be associated with bradycardia.
基金supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions(No.Jx10131801095 to HongZhou)
文摘Neuroinflammation has been recognized to play a critical role in the pathogenesis of Alzheimer＇s disease （AD）, which is pathologically characterized by the accumulation of senile plaques containing activated microglia and amyloid β-peptides （Aβ）. In the present study, we examined the neuroprotective effects of hydrogen sulfide （H2S） on neuroinflammation in rats with Aβ1-40 hippocampal injection. We found that Aβ-induced rats exhibited a disorder of pyramidal cell layer arrangement, and a decrease of mean pyramidal cell number in the CA1 hippocampal region compared with those in sham operated rats. NaHS （a donor of H2S, 5.6 mg/kg/d, i.p.） treatment for 3 weeks rescued neuronal cell death significantly. Moreover, we found that H2S dramatically suppressed the release of TNF-α, IL-1β and IL-6 in the hippocampus. Consistently, both immunohistochemistry and Western blotting assays showed that H2S inhibited the upregulation of COX-2 and the activation of NF-κB in the hippocampus. In conclusion, our data indicate that H2S suppresses neuroinflammation via inhibition of the NF-κB activation pathway in the Aβ-induced rat model and has potential value for AD therapy.
文摘Objective To establish the mitral regurgitation swine model and study the change of hydrogen sulfide(H2S)system in chronic heart failure model.Methods Miniature pigs were randomly divided into two groups,the control group(n=6)and mitral regurgitation group(n=6).Chronic heart failure models were established by pulling mitral chordal through a small incision extracorporeal.
基金supported by the Natural Science Foundation of Shandong China (No.2009ZRA05107)the Plan of Innovation Team of Ministry of Education China (No.IRT0759)
文摘The effect of H2S contents on the transformation of 1-hexene with hydrogen over NiMoS/γ-Al2O3 catalyst was investigated.Inhibition of H2S on both hydrogenation and isomerization reactions of olefin has been demonstrated.And the promotion effect of H2S on the formation of C6 thiols and C12 thioethers has also been observed.It was found out that there was only one type of active site on the NiMoS/γ-Al2O3 for reactions which include hydrogenation reaction,isomerization reaction and sulfides formation reaction,and the formation reactions of sulfides were superior to both hydrogenation and isomerization reactions.The reaction network for the conversion of 1-hexene in the presence of H2S was proposed.
基金Supported by the National Natural Science Foundation of China(50972038)the National Natural Science Foundation of Hebei Province(B2009000739,B2014209258)Science and Technology Support Program of Hebei Province(09215142D)
文摘The presence of a limited amount of H2S in H2-rich feed adversely affects the Pd-Cu membrane permeation performance due to the sulphidization of the membrane surface. A theoretical model was proposed to predict the S-tolerant performance of the Pd-Cu membranes in presence of H2S under the industrial water-gas-shift(WGS) reaction conditions. The ideas of surface coverage and competitive adsorption thermodynamics of H2S and H2 on Pd-Cu surface were introduced in the model. The surface sulphidization of the Pd-Cu membranes mainly depended on the pressure ratio of H2S to H2, temperature and S-adsorbed surface coverage, i.e., the occurrence of sulphidization on the surface was not directly related with the bulk compositions and structures [body centered cubic and face centered cubic(bcc or fcc)] of Pd-Cu alloy membranes because of the surface segregation phenomena. The resulting equilibrium equations for the H2S adsorption/sulphidization reactions were solved to calculate the pressure ratio of H2S to H2 over a wide range of temperatures. A validation of the model was performed through a comparison between lots of literature data and the model calculations over a rather broad range of operating conditions. An extremely good agreement was obtained in the different cases, and thus, the model can serve to guide the development of S-resistant Pd alloy membrane materials for hydrogen separation.
基金Funded by the Program for National Science Foundation for Distinguished Young Scholars (No.51125019)the National Natural Science Foundation of China (No.50904050)+2 种基金the Basic Projects of Sichuan Province of China(No.2011JY0106)Postdoctoral Science Foundation(No.20110490810)the Special Fund of China's Central Government for the Development of Local Colleges and Universities-the Project of National First-level Discipline in Oil and Gas Engineering
文摘With the aid of hydrogen permeating devices, the hydrogen permeation behaviors of X52 pipeline steel in NACE A solution with saturated H2S/CO2 were studied under the conditions of different ambient temperatures and pH values, and the hydrogen permeation behaviors of X52 pipeline steel in weld seam zone were comparatively studied. The experimental results show that the hydrogen permeation coefficient value is directly proportional to the time required for reaching the saturation anode current and inversely proportional to the saturation anode current, and the hydrogen permeation coefficient is influenced by the corrosion scales; the temperature is directly proportional to the saturation anode current, and the hydrogen permeation coefficient is influenced by the temperature and corrosion scales, heat-affected zone and matrix zone in NACE A solution with saturated H2S/CO2 at normal temperature. The hydrogen permeation coefficient in weld seam zone is larger than that in heat-affected zone which is further larger than that in matrix zone.
文摘A new intelligent amperometric type of electrochemical hydrogen probe to measure hydrogen atom permeation rate in the metals was devised and developed. Combined with MCS51 single slice computer system, specially programmed software was designed for data sampling, logging, storing, processing, result judgment and data output controlling. The probe is portable and can be used in both lab and in site automatically.
文摘Hydrogen sulfide is synthesized endogenously in mammals and has been shown to have both physiological and pathological functions. So far there has been little agreement as to the actual levels of endogenous sulfide under physiological or pathological conditions;this is partly due to the complexity involved in measuring free sulfides due to H2S volatility, oxidation, reactivity and the presence of bound labile sulfur in tissues. In this report we describe a method of measuring free tissue sulfides using a zinc sulfide precipitation and wash method. It is an indirect method that measures the sulfide difference between samples prepared at pH 9 and pH 6, assuming that at pH 9 free sulfides would be retained in solution, while at pH 6 free sulfides would volatilize during sample preparation. Using this approach we were able to measure appreciable amounts of free sulfides in mouse: lung, pancreas, liver and kidney at 0.036 + 0.006, 0.082 + 0.009, 0.215 + 0.016 and 0.323 + 0.031 nmole per mg of tissue respectively (n = 6).
文摘为保障工作人员在硫化氢(H_(2)S)泄漏工况下的生命安全,以东南部海域某高含硫油田开发工程为例,结合国内第一艘圆筒形浮式生产储油卸油装置(Floating Production Storage and Offloading,FPSO)的结构特点,设计一种适用于高含H_(2)S油气田的FPSO应急空气呼吸系统。研究表明:该空气呼吸系统安全可靠、占地面积小、使用方便。研究成果可为H_(2)S防护设计提供一定参考。
