Environmental Control Center Co.

Hachiōji, Japan

Environmental Control Center Co.

Hachiōji, Japan

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Ito D.,Tokyo University of Agriculture and Technology | Ito D.,Environmental Control Center Co. | Toyota K.,Tokyo University of Agriculture and Technology | Li Z.G.,Tokyo University of Agriculture and Technology
Nematology | Year: 2017

Yellowing symptoms sometimes cause yield losses in green soybean cultivation. The objective of this study was to estimate the yield loss factors in a glasshouse. The parameters evaluated were plant-parasitic nematodes (Heterodera glycines, Pratylenchus penetrans, Meloidogyne spp.) and soil chemical properties. While the density of H. glycines did not show a negative correlation with yield in the February planting date, it showed a strongly negative correlation in the March planting date. Multiple regression analysis showed that yield was significantly correlated with P. penetrans and nitrate in the February planting, and with H. glycines and K in the March planting. The present study revealed that yield loss was caused by P. penetrans and nitrate in seasons with unsuitable temperatures for H. glycines hatch, and by H. glycines and alleviated by K in seasons with optimum temperatures for H. glycines hatching. © 2017 Copyright 2017 by Koninklijke Brill NV, Leiden, The Netherlands.


Horii Y.,Center for Environmental Science in Saitama | Horii Y.,Japan National Institute of Advanced Industrial Science and Technology | Taniyasu S.,Japan National Institute of Advanced Industrial Science and Technology | Tsuchiya Y.,Environmental Control Center Co. | And 4 more authors.
Bunseki Kagaku | Year: 2010

ISO 24293: 2009 describes a new international standard method for the determination of 13 individual 4-nonylphenol (4-NP) isomers in non-filtered samples of drinking water, wastewater, ground water and surface water using solid-phase extraction and gas chromatography/mass spectrometry. To validate this method, 17 laboratories from 3 different countries participated in an interlaboratory trial to determine its performance characteristics. The interlaboratory trial was evaluated according to ISO 5725-2, and included four triplicate non-filtered water samples: surface river water with low (RW1) and high (RW2) concentrations of 4-NP standard spiking and wastewater with low (WW3) and high (WW4) concentrations of 4-NP standard spiking. The repeatability variation coefficients (within-laboratory precision) varied for all isomers, ranging from 4.4% to 21.6%. The reproducibility variation coefficients (between-laboratory precision) were found to be 24.9 ± 6.4% for RW1, 30.6 ±10.7% for RW2, 63.3 ± 34.6% for WW3, and 36.6 ±13.5% for WW4. Proficiency testing concerning the ability of analytical laboratories was performed based on ISO/IEC Guide 43-1, "Proficiency testing by interlaboratory comparisons". The laboratories were evaluated using z scores based on a robust method; 8 to 13 laboratories (71% to 92%) were estimated to be "satisfactory (| z | ≦2)", 0 to 1 laboratories (0% to 10%) as "questionable (2<| z |<3)", 1 to 3 laboratories (7.7% to 23%) as "unsatisfactory (| z | ≧3)" for all water samples tested. © 2010 The Japan Society for Analytical Chemistry.


Taniyasu S.,Japan National Institute of Advanced Industrial Science and Technology | Kannan K.,New York State Department of Health | Wu Q.,New York State Department of Health | Kwok K.Y.,City University of Hong Kong | And 8 more authors.
Analytica Chimica Acta | Year: 2013

The ISO 25101 (International Organization for Standardization, Geneva) describes a new international standard method for the determination of perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA) in unfiltered samples of drinking and surface waters. The method is based on the extraction of target analytes by solid phase extraction, solvent elution, and determination by high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). For the determination of the performance of this method, more than 20 laboratories from 9 different countries participated in an inter-laboratory trial in 2006. In addition, inter-laboratory trials were conducted in 2008 and 2009 for the analysis of perfluoroalkylsubstances (PFASs), including PFOS and PFOA, in water samples by following the protocols of Japanese Industrial Standard (JIS). Overall, the repeatability coefficients of variation (i.e., within-laboratory precision) for PFOS and PFOA in all water samples were between 3 and 11%, showing a adequate precision of the ISO and JIS methods. The reproducibility coefficients of variation (i.e., between-laboratory precision) were found to vary within a range of 7-31% for surface water and 20-40% for wastewater. The recoveries of PFOS and PFOA, as a measure of accuracy, varied from 84 to 100% for surface water and from 84 to 100% for wastewater among the samples with acceptable criteria for internal standards recovery. The determined concentrations of PFASs in samples compared well with the " true" values. The results of the inter-laboratory trial confirmed that the analytical methods are robust and reliable and can be used as a standard method for the analysis of target compounds in water samples. © 2013 Elsevier B.V.


PubMed | Dow Corning, Wacker Asahikasei Silicone Co., JNC Corporation, Shin - Etsu Chemical Co. and 2 more.
Type: | Journal: The Science of the total environment | Year: 2016

Bioaccumulation and trophic transfer of cyclic volatile methylsiloxanes (cVMS), specifically octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6), were evaluated in the pelagic marine food web of Tokyo Bay, Japan. Polychlorinated biphenyl (PCB) congeners that are legacy chemicals known to bioaccumulate in aquatic organisms and biomagnify across aquatic food webs were used as a benchmark chemical (CB-180) to calibrate the sampled food web and as a reference chemical (CB-153) to validate the results. Trophic magnification factors (TMFs) were calculated from slopes of ordinary least-squares (OLS) regression models and slopes of bootstrap regression models, which were used as robust alternatives to the OLS models. Various regression models were developed that incorporated benchmarking to control bias associated with experimental design, food web dynamics, and trophic level structure. There was no evidence from any of the regression models to suggest biomagnification of cVMS in Tokyo Bay. Rather, the regression models indicated that trophic dilution of cVMS, not trophic magnification, occurred across the sampled food web. Comparison of results for Tokyo Bay to results from other studies indicated that bioaccumulation of cVMS was not related to type of food web (pelagic vs demersal), environment (marine vs freshwater), species composition, or location. Rather, results suggested that differences between study areas was likely related to food web dynamics and variable conditions of exposure resulting from non-uniform patterns of organism movement across spatial concentration gradients.


Win A.T.,Tokyo University of Agriculture and Technology | Toyota K.,Tokyo University of Agriculture and Technology | Ito D.,Tokyo University of Agriculture and Technology | Ito D.,Environmental Control Center Co. | And 5 more authors.
Soil Science and Plant Nutrition | Year: 2016

A field experiment was carried out to evaluate the effect of two whole-crop rice (Oryza sativa L.) cultivars, TULT and Takanari, on methane (CH4) emission in a paddy field fertilized with biogas slurry (BS) at rates of 0 (NF), 100 (BS100) and 300 (BS300) kg nitrogen (N) ha−1, in comparison with chemical fertilizer CF100 (100 kg N ha−1). Takanari produced significantly higher biomass (P < 0.001) than TULT and showed significantly (P < 0.01) lower CH4 emission than TULT. BS applications caused higher CH4 emission (52 ± 27 and 80 ± 19 g m−2 in BS100 and BS300, respectively) than did CF100 (42 ± 18 g m−2) and NF (28 ± 10 g m−2) in TULT. In contrast, there was no significant difference in CH4 emission in Takanari among the treatments (26 ± 2, 26 ± 2, 32 ± 4, 29 ± 8 g m−2 in NF, CF100, BS100 and BS300, respectively). Methane oxidizing bacteria (MOB) showed significantly (P < 0.05) higher populations in Takanari than in TULT at harvest, which might be due to the higher root biomass (10.3 ± 2.2 g hill−1) in Takanari than in TULT (8.9 ± 1.8 g hill−1). MOB was significantly correlated with tiller number (R2 = 0.176*) and plant biomass (R2 = 0.242*). BS application showed higher copper (Cu) uptake in Takanari while it was not high in TULT. In contrast, it showed no difference in zinc (Zn) uptake in both varieties. Uptake of Cu was not different between the two varieties, while uptake of Zn in the grain was higher in TULT than in Takanari. The present study suggests that CH4 emission deriving from BS application in paddy field can be mitigated by selecting an appropriate cultivar, like Takanari. However, care should be taken for heavy metal uptake in selecting cultivars. © 2016 Japanese Society of Soil Science and Plant Nutrition


Goto K.,Tokyo University of Agriculture and Technology | Toyota K.,Tokyo University of Agriculture and Technology | Toyota K.,Sakata Seed Co | Ito D.,Tokyo University of Agriculture and Technology | Ito D.,Environmental Control Center Co.
Nematology | Year: 2013

The effects of the application of bean sprout residue to soil on the soybean cyst nematode (SCN) Heterodera glycines were evaluated in pot experiments. When bean sprout residue was applied into a soil infested with SCN at a rate of 1%, the number of SCN second-stage juveniles (J2), measured with the Baermann method, increased after 14 days of application and then decreased markedly after 35 days, indicating that some J2 hatched in response to a stimulant in the bean sprout residue and then starved to death in the absence of a host. Next, bean sprout residue was applied two or four times and the number of SCN after 7 weeks was estimated with real-time PCR, which enables quantification of all the forms of SCN (eggs, J2, cysts). Results showed that the SCN density did not change in the untreated control, while it decreased by more than 70% in the residue treatment. Such a hatching-stimulatory and subsequent eradication effect was observed in the water extract of bean sprout residue. Among different parts of bean sprout, both of the stem and root parts had a higher stimulatory effect for hatching, while a stimulatory effect decreased in the stem part greened by culturing under light conditions. These results revealed that bean sprout residue might function as an environmental-friendly control measure for SCN. © Koninklijke Brill NV, Leiden, 2013.


Ito D.,Tokyo University of Agriculture and Technology | Ito D.,Environmental Control Center Co. | Sedrati G.M.,Tokyo University of Agriculture and Technology | Toyota K.,Tokyo University of Agriculture and Technology
Nematology | Year: 2015

The soybean cyst nematode (SCN), Heterodera glycines, is a widespread pest in most soybean-producing areas, causing serious damage to soybean crops and resulting in economic losses.We have previously reported that bean sprout residue might function as an environmentally-friendly control agent against SCN. In order to understand the role of water extracted from bean sprout residue as a possible factor in lowering the number of SCN, either water extract of bean sprout residue (WE) or water (W) was applied to pots containing soil infested with SCN, and komatsuna plants, a leafy vegetable, were grown in these pots. After 2 months, the number of SCN, estimated with real-time PCR, was 80% lower in WE than in W and the biomass of komatsuna plants was 100% higher in WE than in W, suggesting that WE has not only an SCN eradication effect but also a fertilisation effect. In field experiments, WE or W was applied ten times during the experimental period from July 2010 to June 2011. The number of SCN decreased by 82% in WE and by 36% in W; however, the marked decrease was observed only between July and September and between April and June. Green soybean plants were grown in the field where WE or W had been applied and the yield was markedly higher in WE (750 g m?2) than in W (200 g m?2). The hatching stimulation of SCN eggs by WE was tested at four different temperatures (10, 20, 25, 30C) and was observed only at 25C. These results show that water extract of bean sprout residue decreases the density of SCN and thereby damage to green soybeans, and that the suppressive effect depends on soil temperature. © 2015 Koninklijke Brill NV, Leiden.


Kawanaka Y.,Environmental Control Center Co. | Matsumoto E.,Environmental Control Center Co. | Sakamoto K.,Saitama University | Yun S.-J.,Environmental Control Center Co.
Science of the Total Environment | Year: 2011

The present study was performed to estimate the contributions of fine and ultrafine particles to the lung deposition of particle-bound mutagens in the atmosphere. This is the first estimation of the respiratory deposition of atmospheric particle-bound mutagens. Direct and S9-mediated mutagenicity of size-fractionated particulate matter (PM) collected at roadside and suburban sites was determined by the Ames test using Salmonella typhimurium strain TA98. Regional deposition efficiencies in the human respiratory tract of direct and S9-mediated mutagens in each size fraction were calculated using the LUDEP computer-based model. The model calculations showed that about 95% of the lung deposition of inhaled mutagens is caused by fine particles for both roadside and suburban atmospheres. Importantly, ultrafine particles were shown to contribute to the deposition of mutagens in the alveolar region of the lung by as much as 29% (+. S9) and 26% (-S9) for the roadside atmosphere and 11% (+. S9) and 13% (-S9) for the suburban atmosphere, although ultrafine particles contribute very little to the PM mass concentration. These results indicated that ultrafine particles play an important role as carriers of mutagens into the lung. © 2010 Elsevier B.V.


Kamao S.,Nihon University | Takezawa M.,Nihon University | Yamada K.,Nihon University | Jinno S.,Nihon University | And 2 more authors.
WIT Transactions on the Built Environment | Year: 2013

Soil liquefaction describes a phenomenon whereby a saturated soil substantially loses strength and stiffness in response to an applied stress, usually earthquake shaking or another sudden change in stress condition, causing it to behave like a liquid. The liquefaction phenomenon due to the Great East Japan Earthquake 2011 occurred to the reclaimed land around the Tokyo Bay area. Urayasu city was caused extensive damage by liquefaction due to the earthquake, and recovery from the disaster is still going on. This paper describes some remarkable damage against the structures due to the liquefaction by the earthquake, and indicates the possibility of liquefaction by current determination methods using published soil profile and N value of SPT (Standard Penetration Test). The authors also carried out a series of laboratory liquefaction tests (the cyclic undrained triaxial test) in order to make clear the characteristics of liquefaction, using Urayasu sand taken from the liquefied site in Urayasu city. © 2013 WIT Press.


PubMed | Environmental Control Center Co.
Type: Journal Article | Journal: The Science of the total environment | Year: 2011

The present study was performed to estimate the contributions of fine and ultrafine particles to the lung deposition of particle-bound mutagens in the atmosphere. This is the first estimation of the respiratory deposition of atmospheric particle-bound mutagens. Direct and S9-mediated mutagenicity of size-fractionated particulate matter (PM) collected at roadside and suburban sites was determined by the Ames test using Salmonella typhimurium strain TA98. Regional deposition efficiencies in the human respiratory tract of direct and S9-mediated mutagens in each size fraction were calculated using the LUDEP computer-based model. The model calculations showed that about 95% of the lung deposition of inhaled mutagens is caused by fine particles for both roadside and suburban atmospheres. Importantly, ultrafine particles were shown to contribute to the deposition of mutagens in the alveolar region of the lung by as much as 29% (+S9) and 26% (-S9) for the roadside atmosphere and 11% (+S9) and 13% (-S9) for the suburban atmosphere, although ultrafine particles contribute very little to the PM mass concentration. These results indicated that ultrafine particles play an important role as carriers of mutagens into the lung.

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