Biomedical subjects

Kazunori Sakamoto

Publications and source records attributed to Kazunori Sakamoto.

3 recordsLinked to original sources

PubMed2005

Simultaneous determination of atmospheric sulfur and nitrogen oxides using a battery-operated portable filter pack sampler.

We developed a method to analyze atmospheric SO(x) (particulate SO(4)(2-)+ gaseous SO(2)) and NO(x) (NO + NO(2)) simultaneously using a battery-operated portable filter pack sampler. NO(x) determination using a filter pack method is new. SO(x) and NO(x) were collected on a Na(2)CO(3) filter and PTIO (2-phenyl-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl) + TEA (triethanolamine) filters (6 piled sheets), respectively. Aqueous solutions were then used to extract pollutants trapped by the filters and the resulting extracts were pre-cleaned (e.g. elimination of PTIO) and analyzed for sulfate and nitrite by ion chromatography. Recoveries of SO(2) and NO(x) from standard pollutant gases and consistency of the field data with those from other instrumental methods were examined to evaluate our method. SO(x) and NO(x) could be analyzed accurately with determination limits of 0.2 ppbv and 1.0 ppbv (as daily average concentrations), respectively. The sampler can determine SO(x) and NO(x) concentrations at mountainous or remote sites without needing an electric power supply.

Air Pollutants↗

PubMed2002

[The present situation and subject].

Terumo Corporation has been supporting the regional medical network, developing new products for home health care and providing service through the Home-Joint system in the fields of HPN, HEN, and HOT. In the chain of servicing, we are carrying out call center operations that can receive inquiries regarding machine operation and machine trouble from the patients, for 24 hours a day, all year round. Most inquiries are settled then and there, but some cases need further treatment. The principal cases are, Lowness mastery degree of patients or tenders, wants of knowledge of the person in charge of answering inquiries, and coming under the medical treatment. It is indispensable to connect closely with Hospitals, the visiting nurse, and agencies. Today's Subject: Pursuit of simplicity and safety of equipment based on On-Call experience. Thorough, careful confirmation for several days from the start. Standardization of On-call information and sharing with the agency and hospital. Advancement of knowledge for answering inquiries. Making a system to cope with medical facilities.

Community Networks↗

PubMedDate not supplied

Spatial variability of nitrous oxide emissions and their soil-related determining factors in an agricultural field.

To evaluate spatial variability of nitrous oxide (N2O) emissions and to elucidate their determining factors on a field-scale basis, N2O fluxes and various soil properties were evaluated in a 100- x 100-m onion (Allium cepa L.) field. Nitrous oxide fluxes were determined by a closed chamber method from the one-hundred 10- x 10-m plots. Physical (e.g., bulk density and water content), chemical (e.g., total N and pH), and biological (e.g., microbial biomass C and N) properties were determined from surface soil samples (0-0.1 m) of each plot. Geostatistical analysis was performed to examine spatial variability of both N2O fluxes and soil properties. Multivariate analysis was also conducted to elucidate relationships between soil properties and observed fluxes. Nitrous oxide fluxes were highly variable (average 331 microg N m(-2) h(-1), CV 217%) and were log-normally distributed. Log-transformed N2O fluxes had moderate spatial dependence with a range of >75 m. High N2O fluxes were observed at sites with relatively low elevation. Multivariate analysis indicated that an organic matter factor and a pH factor of the principal component analysis were the main soil-related determining factors of log-transformed N2O fluxes. By combining multivariate analysis with geostatistics, a map of predicted N2O fluxes closely matched the spatial pattern of measured fluxes. The regression equation based on the soil properties explained 56% of the spatially structured variation of the log-transformed N2O fluxes. Site-specific management to regulate organic matter content and water status of a soil could be a promising means of reducing N2O emissions from agricultural fields.

Air Pollutants↗