The issues of how to quickly collect seawater samples and of how to make sure that those samples truly reflect the in-situ information on gas composition and concentration have therefore become a hot but difficult top...The issues of how to quickly collect seawater samples and of how to make sure that those samples truly reflect the in-situ information on gas composition and concentration have therefore become a hot but difficult topic in the field of ocean technology.Most conventional seawater samplers only focus on collecting seawater itself,but take little consideration on gas preservation.A set of new oceanographic tools are presented for ocean resource exploration such as hydrothermal sulfide and gas hydrate,and for investigations on the processes and mechanisms of marine physical,chemical and biological evolutions.A gas-tight deep-sea water sampling system（GTWSS） is designed for the collection of deep-sea geochemical samples.This set of tools mainly consists of a conductivity temperature depth profiler（CTD）,release devices and gas-tight deep-sea water samplers（GTWS）.The GTWS is able to hold the gases in deep-sea water samples tightly,providing in-situ information on gas contents in the seawater samples and can be deployed on a routine wire-deployed CTD sampler for multi-layer discrete sampling of gas-tight seawater.Sea trials are performed successfully in 2008 and 2009,on a research vessel named HaiYang Si Hao in South China Sea,with the deepest trial depth 3 930 m.GTWSS is capable of quickly sampling 12 discrete gas-tight seawater samples（8.3 L per sample） during its single deployment.The head space method is employed to separate the gases from the seawater samples immediately after recovery of the seawater samples on the vessel.Field geochemical analysis is carried out by gaseous hydrocarbon sensors and an infrared gas analyzer.Results show that the concentrations of CH4 and CO2 in the seawater sampled by GTWSS are higher than those sampled by general non-gas-tight water samplers,thus confirming the gas tightness of GTWSS.Seawater samples can be collected quickly by using GTWSS,and GTWSS can keep the samples＇ integrity quite well.展开更多
It is of practical significance to study the influence of hyperoxia or hyperbaricoxygen (HBO) on organism, which was often concerned with both diving operation and clinical treatment with oxygen.
Previous studies have shown that the influence of intracranial hypertension (ICH) combined with acute hypoxia on cerebral blood flow (CBF) is different from that with normoxia. But it has not been reported whether the...Previous studies have shown that the influence of intracranial hypertension (ICH) combined with acute hypoxia on cerebral blood flow (CBF) is different from that with normoxia. But it has not been reported whether the effects of ICH with hypoxia on the brain function, as well as on CBF, have different features and mechanism from that with normoxia. In the present study, the effects of ICH combined with hypoxia on cat’s electroeortical activity and electrocardiogram (ECG) are investigated.展开更多
The previous study has proved that high pressure oxygen （HPO） can obviously reduce the intracranial pressure （ICP）. Whether the effect of 120 min differs from that of 30 or 60 min is of practical significance to c...The previous study has proved that high pressure oxygen （HPO） can obviously reduce the intracranial pressure （ICP）. Whether the effect of 120 min differs from that of 30 or 60 min is of practical significance to clinical treatment. Because some hospitals do not have the equipment of hyperbaric chamber to perform HPO treatment, it is necessary to compare the effect of IATA O2 on ICP with that of 4ATA O2. The present results would contribute to illustrating the respective effects of atmosphere and oxygen pressure on ICP.展开更多
A great number of research workers have proved this phenomenon of physiological regulation since Fog demonstrated ability of autoregulation in cerebral vessel with cranial window. The autoregulation of cerebral blood ...A great number of research workers have proved this phenomenon of physiological regulation since Fog demonstrated ability of autoregulation in cerebral vessel with cranial window. The autoregulation of cerebral blood flow (CBF) means that as cerebral perfusion pressure (CPP) changes in a certain range, the brain still maintains an internal ability stabilizing CBF.展开更多
基金supported by National Hi-tech Research and Development Program of China(863 Program,Grant Nos. 2006AA09A204-1,2006AA09Z222-1,2009AA09A20401-1)
文摘The issues of how to quickly collect seawater samples and of how to make sure that those samples truly reflect the in-situ information on gas composition and concentration have therefore become a hot but difficult topic in the field of ocean technology.Most conventional seawater samplers only focus on collecting seawater itself,but take little consideration on gas preservation.A set of new oceanographic tools are presented for ocean resource exploration such as hydrothermal sulfide and gas hydrate,and for investigations on the processes and mechanisms of marine physical,chemical and biological evolutions.A gas-tight deep-sea water sampling system（GTWSS） is designed for the collection of deep-sea geochemical samples.This set of tools mainly consists of a conductivity temperature depth profiler（CTD）,release devices and gas-tight deep-sea water samplers（GTWS）.The GTWS is able to hold the gases in deep-sea water samples tightly,providing in-situ information on gas contents in the seawater samples and can be deployed on a routine wire-deployed CTD sampler for multi-layer discrete sampling of gas-tight seawater.Sea trials are performed successfully in 2008 and 2009,on a research vessel named HaiYang Si Hao in South China Sea,with the deepest trial depth 3 930 m.GTWSS is capable of quickly sampling 12 discrete gas-tight seawater samples（8.3 L per sample） during its single deployment.The head space method is employed to separate the gases from the seawater samples immediately after recovery of the seawater samples on the vessel.Field geochemical analysis is carried out by gaseous hydrocarbon sensors and an infrared gas analyzer.Results show that the concentrations of CH4 and CO2 in the seawater sampled by GTWSS are higher than those sampled by general non-gas-tight water samplers,thus confirming the gas tightness of GTWSS.Seawater samples can be collected quickly by using GTWSS,and GTWSS can keep the samples＇ integrity quite well.
文摘It is of practical significance to study the influence of hyperoxia or hyperbaricoxygen (HBO) on organism, which was often concerned with both diving operation and clinical treatment with oxygen.
文摘Previous studies have shown that the influence of intracranial hypertension (ICH) combined with acute hypoxia on cerebral blood flow (CBF) is different from that with normoxia. But it has not been reported whether the effects of ICH with hypoxia on the brain function, as well as on CBF, have different features and mechanism from that with normoxia. In the present study, the effects of ICH combined with hypoxia on cat’s electroeortical activity and electrocardiogram (ECG) are investigated.
文摘The previous study has proved that high pressure oxygen （HPO） can obviously reduce the intracranial pressure （ICP）. Whether the effect of 120 min differs from that of 30 or 60 min is of practical significance to clinical treatment. Because some hospitals do not have the equipment of hyperbaric chamber to perform HPO treatment, it is necessary to compare the effect of IATA O2 on ICP with that of 4ATA O2. The present results would contribute to illustrating the respective effects of atmosphere and oxygen pressure on ICP.
文摘A great number of research workers have proved this phenomenon of physiological regulation since Fog demonstrated ability of autoregulation in cerebral vessel with cranial window. The autoregulation of cerebral blood flow (CBF) means that as cerebral perfusion pressure (CPP) changes in a certain range, the brain still maintains an internal ability stabilizing CBF.
