Nobukazu Nakagoshi - Academia.edu (original) (raw)

Uploads

Papers by Nobukazu Nakagoshi

Journal of the Japanese Society of Revegetation Technology, 1993

Open Journal of Animal Sciences, 2013

Asian Pacific Journal of Tropical Biomedicine, 2013

To investigate the toxicity of indigenous Bacillus thuringiensis (B. thuringiensis)isolates from ... more To investigate the toxicity of indigenous Bacillus thuringiensis (B. thuringiensis)isolates from Malang City for controlling Aedes aegypti (Ae. aegypti) larvae. Soil samples were taken from Purwantoro and Sawojajar sub-districts. Bacterial isolation was performed using B. thuringiensis selective media. Phenotypic characteristics of the isolates were obtained with the simple matching method. The growth and prevalence of spores were determined by the Total Plate Count method, and toxicity tests were also performed on the third instar larval stage of Ae. aegypti. The percentage of larval mortality was analysed using probit regression. The LC50 was analysed by ANOVA, and the Tukey HSD interval was 95%. Among the 33 selected bacterial isolates, six were obtained (PWR4-31, PWR4-32, SWJ4-2b, SWJ4-4b, SWJ-4k and SWJ5-1) that had a similar phenotype to reference B. thuringiensis. Based on the dendrogram, all of the bacterial isolates were 71% similar. Three isolates that had a higher prevalence of reference B. thuringiensis were PWR4-32, SWJ4-4b and SW5-1, of which the spore prevalence was 52.44%, 23.59%, 34.46%, respectively. These three indigenous isolates from Malang City successfully killed Ae. aegypti larvae. The PWR4-32 isolates were the most effective at killing the larvae. Six indigenous B. thuringiensis isolates among the 33 bacterial isolates found in the Sawojajar and Purwantoro sub-districts were toxic to the third instar larvae of Ae. aegypti. The PWR4-32 isolates were identical to the reference B. thuringiensis and had 88% phenotype similarity. The PWR4-32 isolates had the highest spore prevalence (52.44%), and the early stationary phase occurred at 36 h. The PWR4-32 isolates were the most effective at killing Ae. aegypti larvae (LC50-72 h=2.3×10(8) cells/mL).

Journal of International Development and Cooperation, Mar 31, 2010

Journal of International Development and Cooperation, Dec 1, 2011

Hikobia, Dec 1, 2011

ABSTRACT The main objective of this study is to assess the land suitability for oil production in... more ABSTRACT The main objective of this study is to assess the land suitability for oil production in Landak Regency, West Kalimantan, Indonesia. Multi criteria decision analysis (MCDA) integrated with Geographic information System (GIS) approach was applied. The land suitability analysis was carried out based on some relevant factors, such as climate, topography, soil type, and additionally water source as a basic growth requirement for oil palm production. The latest land use/cover of 2009 and the concession map of the existing oil palm plantations were used to evaluate the generated land suitability maps for oil palm production. The final land suitability assessment using GIS technique resulted an estimate of 53,765 ha (6.52%) and 246,943 ha (29.96%) of the study area classified as highly and moderately suitable, respectively, where 254,347 ha (85%) of those classes were located in unproductive areas, such as barren land, shrubs/bush, and shrubs-mixed dry-land farm, which are proposed by this study to be suitable for new oil palm plantation.

Agrivita Journal of Agricultural Science, Jun 6, 2011

In the biological science, invertebrate (especially insect) diversity is relatively well known. Y... more In the biological science, invertebrate (especially insect) diversity is relatively well known. Yet, little study about their interaction with specific land use or specific system function. With the rapid changes of landscape, biodiversity is also changes in response to human impact; ...

Agrivita Journal of Agricultural Science, 2010

... MATERIALS AND METHODS The study was conducted in several areas of Wonogiri Regency, and Pacit... more ... MATERIALS AND METHODS The study was conducted in several areas of Wonogiri Regency, and Pacitan Regency Central Java and East Java Province of Indonesia from April to June 2006 as a part of economic and ecological evaluation on dry-land agriculture system ...

Journal of Tropical Life Science, Feb 6, 2014

Agrivita Journal of Agricultural Science, Nov 5, 2012

Se Pu Chinese Journal of Chromatography Zhongguo Hua Xue Hui, Apr 1, 2012

The water quality monitoring operation to evaluate the water quality of polluted river is an extr... more The water quality monitoring operation to evaluate the water quality of polluted river is an extremely important task for the river-watershed management/control based on the environmental policy. In this study, the novel, simple and convenient water quality monitoring of Jialing-River in Chongqing, China was carried out using an advanced ion chromatography (IC) consisting of ion-exclusion/cation-exchange chromatography (IEC/CEC) with conductivity detection for determining simultaneously the common anions such as SO4(2-), Cl(-), and NO3(-) and the cations such as Na+, NH4+, K+, Mg2+, and Ca2+, the ion-exclusion chromatography (IEC) with visible detection for determining simultaneously the nutrient components such as phosphate and silicate ions, and the IEC with the enhanced conductivity detection using a post column of K+-form cation-exchange resin for determining HCO3(-)-alkalinity as an inorganic-carbon source for biomass synthesis in biological reaction process under the aerobic conditions. According to the ionic balance theory between the total equivalent concentrations of anions and cations, the water quality evaluation of the Jialing-River waters taking at different sampling sites in Chongqing metropolitan area was carried out using the advanced IC system. As a result, the effectiveness of this novel water quality monitoring methodology using the IC system was demonstrated on the several practical applications to a typical biological sewage treatment plant on Jialing-River of Chongqing.

Analytica chimica acta, Jan 30, 2008

The simultaneous spectrophotometric determination of phosphate and silicate ions in river water w... more The simultaneous spectrophotometric determination of phosphate and silicate ions in river water was examined by using ion-exclusion chromatography and post-column derivatization. Phosphate and silicate ions were separated by the ion-exclusion column packed with a polymethacrylate-based weakly acidic cation-exchange resin in the H(+)-form (TSKgel Super IC-A/C) by using ultra pure water as an eluent. After the post-column derivatization with molybdate and ascorbic acid, so-called molybdenum-blue, both ions were determined simultaneously by spectrophotometry. The effects of sulfuric acid, sodium molybdate and ascorbic acid concentrations and reaction coil length, which have relation to form the reduced complexes of molybdate and ions, on the detector response for phosphate and silicate ions were investigated. Under the optimized conditions (color-forming reactant, 50 mM sulfuric acid-10 mM sodium molybdate; reducing agent, 50 mM ascorbic acid; reaction coil length, 6 m), the calibratio...