Characteristics of CO₂, CH₄ and N₂O emissions from a multi-soil-layering system during wastewater treatment     

Tsugiyuki MASUNAGA  Kuniaki SATO  Yukiko SENGA  Yasushi SEIKE  Takao INAISHI  Hiromoto KUDO  Toshiyuki WAKATSUKI 《Soil Science and Plant Nutrition》2007,53(2):173-180

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Characterization of Treatment Processes and Mechanisms of COD, Phosphorus and Nitrogen Removal in a Multi-Soil-Layering System   总被引：3，自引：0，他引：3  

Kuniaki Sato  Tsugiyuki Masunaga  Toshiyuki Wakatsuki 《Soil Science and Plant Nutrition》2005,51(2):213-221

Characteristics of the treatment processes inside a MSL system were investigated by using a laboratory-scale MSL system, which was set up in a D 10 × W 50 × H 73 cm acrylic box enclosing "soil mixture blocks" alternating with permeable zeolite layers. For the study of the treatment processes inside the system, wastewater, with mean concentrations (mg L⁻¹) of COD: 70, T-N: 12, T-P: 0.9, was introduced into the system at a loading rate of 1,000 L m⁻² d⁻¹. Treatment processes in the MSL system were different for the COD, P and N pollutants. Eighty percent of COD was removed in the 1st soil layer among the 6 layers, and the removal rate increased as water moved down and finally reached 90% in the last layer of the system. Phosphorus concentration was lower under the soil mixture layers than under the permeable layers, presumably because P was adsorbed mainly by soil and mixed iron particles. The P concentration in water gradually decreased in the lower layers of the system. The concentration of PO₄^3--P was generally lower in the aerated MSL system than in the non-aerated one. NH₄⁺-N was adsorbed and nitrified in the upper part of the system. The NO₃⁻-N concentration was lower in water under the soil mixture layers than under the permeable layers, indicating that denitrification mainly occurred in the soil mixture layers.  相似文献   

Oscillatory expression of the bHLH factor Hes1 regulated by a negative feedback loop   总被引：1，自引：0，他引：1  

Hirata H  Yoshiura S  Ohtsuka T  Bessho Y  Harada T  Yoshikawa K  Kageyama R 《Science (New York, N.Y.)》2002,298(5594):840-843

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The presence of double-stranded RNAs in <Emphasis Type="Italic">Alternaria alternata</Emphasis> Japanese pear pathotype is associated with morphological changes     

Kuko Fuke  Kana Takeshita  Nanako Aoki  Toshiyuki Fukuhara  Mayumi Egusa  Motoichiro Kodama  Hiromitsu Moriyama 《Journal of General Plant Pathology》2011,77(4):248-252

Strains of the Japanese pear pathotype of Alternaria alternata were screened for double-stranded RNAs (dsRNAs). Four strains had several dsRNAs; strain N18 was associated with several dsRNAs and had impaired growth phenotypes such as irregular mycelium and abnormal pigmentation. We isolated dsRNA-cured isolates from strain N18 by single-conidium isolation. The dsRNA-cured isolates had recovered normal growth and pigmentation. Enlarged vesicles were observed in mycelial cells of the original dsRNA-carrying N18 strain. DAPI nuclear staining revealed regression of the nuclei in dsRNA-carrying N18 cells. These results indicate that the dsRNAs might have negative effects, such as apoptosis-like cell death, on the host fungus.  相似文献   

Extent and Management of Low pH Soils in Ghana     

Mohammed Moro Buri  Roland Nuhu Issaka  Toshiyuki Wakatsuki 《Soil Science and Plant Nutrition》2005,51(5):755-759

A review of soil acidity problems with regards to causes, extent and management in Ghana shows that the extent of soil acidity has changed within a period of 2–3 decades. In the 1970s' soil acidity was a major problem in the Western region and the lowlands. Oxisols and Ultisols are common soils found in this area. However, anthropogenic causes have augmented natural causes resulting in more low pH soils. Soil acidity has therefore become a serious problem throughout the country. Anthropogenic causes identified include general agronomic practices such as tillage, use of mineral fertilizers and continuous cultivation. Rates of 1–2 t ha⁻¹ lime on ultisols and oxisols in Ghana are more than adequate to meet the calcium demands and sufficient to neutralize residual acidity of any nitrogen fertilizer. Addition of organic amendments on low pH soils was also found to be beneficial and resulted in increased yields. The adoption of the "sawah" technology for lowland rice production has also resulted in improved water management, increased nutrient availability and significant increases in rice yields.  相似文献   

Comparative study of soils and other adsorbents for decolorizing sewage and livestock wastewater     

Xin CHEN  Kuniaki SATO  Toshiyuki WAKATSUKI  Tsugiyuki MASUNAGA 《Soil Science and Plant Nutrition》2007,53(2):189-197

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Effects of Curtailment of Nitrogen Fertilizer on Biological Properties and Tea Leaf Yield in Acid Tea Field Soils     

Shinjiro Kanazawa  Gi-Hong An  Toshiyuki Kaizu 《Soil Science and Plant Nutrition》2005,51(5):675-677

In Japan, the soils in tea fields are further acidified by heavy application of nitrogen fertilizer. In the long-term fertilizer application fields, available P, total carbon and nitrogen contents had the highest in the Multi-F plot, followed by the 98-D.F plot and the smallest in the 95-D.F plot. Soil enzymes activity had the highest the Multi-F plot. It was estimated that all of the enzyme activity were often corresponded with the results of the organic matter and the available P contents. The number of fungi under acidic condition had the close relation since change of these enzymes activity. It was evident that fungi were participated in carbon, nitrogen and phosphorus metabolism in acid tea field soils. It became clear that the number of fungi and enzymes activity decreased corresponding well with the available P and the organic matter contents depend on fertilization management. Moreover in case of qualities of green tea, generally difference between experimental plots and Multi-F plot were to be small. It was indicated that influence to the yields by curtailment of the amount of nitrogen fertilization was small.  相似文献   

Evaluation of Extraction Methods for Plant-Available Soil Cadmium to Wheat by Several Extraction Methods in Cadmium-Polluted Paddy Field     

Toshiyuki Ibaraki  Kazuhiro Kadoshige  Masaharu Murakami 《Soil Science and Plant Nutrition》2005,51(6):893-898

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Detection of the esp gene in high-level gentamicin resistant Enterococcus faecalis strains from pet animals in Japan   总被引：1，自引：0，他引：1  

Harada T  Tsuji N  Otsuki K  Murase T 《Veterinary microbiology》2005,106(1-2):139-143

We investigated the prevalence of the esp gene and the susceptibility to gentamicin in Enterococcus faecalis and E. faecium strains obtained from pet animals. Nine of 30 E. faecalis and 2 of 38 E. faecium strains from the pet animals had the esp gene. Three esp-positive E. faecalis strains, which were isolated from two dogs and a cat, showed gentamicin MICs of > or =256 microg/ml and harbored the high-level gentamicin resistance (HLGR) gene, aac(6')-Ie-aph(2')-Ia. Of the nine esp-positive E. faecalis strains, five, including the three strains with the HLGR gene, were closely related by numerical analysis of PFGE patterns. Longitudinal investigation needs to elucidate whether the HLGR gene was incorporated into a subpopulation of the esp-positive E. faecalis.  相似文献   

Analysis of a full-length cDNA library constructed from swine olfactory bulb for elucidation of expressed genes and their transcription initiation sites   总被引：2，自引：0，他引：2  

Fujisaki S  Sugiyama A  Eguchi T  Watanabe Y  Hiraiwa H  Honma D  Saito T  Yasue H 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2004,66(1):15-23

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