C. Maruo, Takeshi Watanabe, Toshiaki Tamaki, D. Sano, O. Nishimura
{"title":"Improvement of Analytical Method for Heavy Metals in Sediment by Microwave Digestion","authors":"C. Maruo, Takeshi Watanabe, Toshiaki Tamaki, D. Sano, O. Nishimura","doi":"10.2965/jswe.45.171","DOIUrl":"https://doi.org/10.2965/jswe.45.171","url":null,"abstract":"","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83747252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hiroyuki Kagawa, Y. Iwasaki, Hiroshi Kimura, Hironobu Inukai, Keiichi Sasaki, Rui Yasuda, T. Yasutaka, Saburo Yamagata, Yuji Kawamura
We investigated longitudinal variations in metal concentrations and in benthic macroinvertebrate and periphyton communities at 13 sites in the tributaries of the upstream Hida River to assess the ecological impacts of mine drainage. At the sites immediately downstream of the inflow of mine drainage, the concentrations of trace metals such as zinc increased （ e.g., the maximum zinc concentration of 0.94 mg L -1 was observed ） , large reductions in the taxon richness and abundance of macroinvertebrates and in the taxon richness of periphyton were observed, and tolerant taxa （ e.g., chironomids and baetid mayflies, and Achnanthidium diatoms ） , which are known to be present in metal-contaminated rivers, dominated their respective communities. Metal concentrations decreased at the downstream sites, and the macroinvertebrate community composition observed at the most downstream site was similar to those at reference sites. Although the longitudinal variations in the taxon richness and community composition of macroinvertebrates and periphyton were similar in the studied river, we observed some differences such as the markedly increased abundance of periphyton at the sites downstream of the inflow of mine discharge. Thus, the investigaton of multiple biological groups is required for a comprehensive understanding of the ecological impacts of mine drainage on aquatic communities.
{"title":"Longitudinal Variations in Macroinvertebrate and Periphyton Communities in a Mountain Stream Receiving Mine Drainage: Are Their Changes in Response to Metal Contamination Different?","authors":"Hiroyuki Kagawa, Y. Iwasaki, Hiroshi Kimura, Hironobu Inukai, Keiichi Sasaki, Rui Yasuda, T. Yasutaka, Saburo Yamagata, Yuji Kawamura","doi":"10.2965/jswe.44.115","DOIUrl":"https://doi.org/10.2965/jswe.44.115","url":null,"abstract":"We investigated longitudinal variations in metal concentrations and in benthic macroinvertebrate and periphyton communities at 13 sites in the tributaries of the upstream Hida River to assess the ecological impacts of mine drainage. At the sites immediately downstream of the inflow of mine drainage, the concentrations of trace metals such as zinc increased （ e.g., the maximum zinc concentration of 0.94 mg L -1 was observed ） , large reductions in the taxon richness and abundance of macroinvertebrates and in the taxon richness of periphyton were observed, and tolerant taxa （ e.g., chironomids and baetid mayflies, and Achnanthidium diatoms ） , which are known to be present in metal-contaminated rivers, dominated their respective communities. Metal concentrations decreased at the downstream sites, and the macroinvertebrate community composition observed at the most downstream site was similar to those at reference sites. Although the longitudinal variations in the taxon richness and community composition of macroinvertebrates and periphyton were similar in the studied river, we observed some differences such as the markedly increased abundance of periphyton at the sites downstream of the inflow of mine discharge. Thus, the investigaton of multiple biological groups is required for a comprehensive understanding of the ecological impacts of mine drainage on aquatic communities.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"194 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77385798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The accuracy of the AIST-SHANEL model for estimating chemical concentrations in river water and sediment was evaluated for bisphenol A in the Tama River from 2017 to 2019 to promote the risk assessment of chemicals in river basins. The estimated river water and sediment concentrations of bisphenol A using the PRTR data were more than one order of magnitude lower than the measured values for both. After confirming the validity of the flow rate, the estimated chemical concentrations in river water and sediment were recalculated by adding the emissions of bisphenol A other than the PRTR data. As a result, the estimated river water concentrations were almost the same as the measured values. Although the concentration in river sediment tended to be underestimated, at about 1/3 of the measurement sites, the estimated concentrations were of the same level as the measured values. To enable further use of the AIST-SHANEL model, it is necessary to accumulate the accuracy evaluation data for more rivers and chemical substances and to examine the validity of the model.
{"title":"Evaluation of Estimation Accuracy of River Model AIST-SHANEL– For Bisphenol A in the Tama River –","authors":"Y. Ishikawa, Yumi Komatsubara, Tomomi Eriguchi","doi":"10.2965/jswe.44.95","DOIUrl":"https://doi.org/10.2965/jswe.44.95","url":null,"abstract":"The accuracy of the AIST-SHANEL model for estimating chemical concentrations in river water and sediment was evaluated for bisphenol A in the Tama River from 2017 to 2019 to promote the risk assessment of chemicals in river basins. The estimated river water and sediment concentrations of bisphenol A using the PRTR data were more than one order of magnitude lower than the measured values for both. After confirming the validity of the flow rate, the estimated chemical concentrations in river water and sediment were recalculated by adding the emissions of bisphenol A other than the PRTR data. As a result, the estimated river water concentrations were almost the same as the measured values. Although the concentration in river sediment tended to be underestimated, at about 1/3 of the measurement sites, the estimated concentrations were of the same level as the measured values. To enable further use of the AIST-SHANEL model, it is necessary to accumulate the accuracy evaluation data for more rivers and chemical substances and to examine the validity of the model.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78316364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Takeshi Matsuura, M. Ono, N. Yakata, Masanori Seki
Recently, it has become possible to select the test concentration range in the fish acute toxicity test using the trend analysis (TA) estimate by a categorical approach, but few studies have been conducted on comparing the TA estimate with the measured toxicity. In this study, we compared the TA estimate[48-h median lethal concentration (LC50)]and the measured toxicity (96-h LC50) of sodium n-decyl sulfate using medaka (Oryzias latipes).Our results indicated that the estimated and experimental values were 310 and 420 mg L, respectively, and the difference was within 1.5 times. Since the alkyl carbon chain length of sodium n-decyl sulfate is outside the range of alkyl carbon chain lengths in existing data, the TA estimate obtained in this study was considered an unreliable extrapolated value. Therefore, there was a concern that the basis for the determination of the concentration range in the definitive test was weak. However, it is considered possible to determine the test concentration in the definitive test with higher accuracy by considering relevant available information (e.g., 96-h LC50 of other fish species) in addition to the TA estimate.
{"title":"Comparison of Trend Analysis Estimate and Measured Toxicity in Fish Acute Toxicity Test of Sodium n-Decyl Sulfate","authors":"Takeshi Matsuura, M. Ono, N. Yakata, Masanori Seki","doi":"10.2965/jswe.44.179","DOIUrl":"https://doi.org/10.2965/jswe.44.179","url":null,"abstract":"Recently, it has become possible to select the test concentration range in the fish acute toxicity test using the trend analysis (TA) estimate by a categorical approach, but few studies have been conducted on comparing the TA estimate with the measured toxicity. In this study, we compared the TA estimate[48-h median lethal concentration (LC50)]and the measured toxicity (96-h LC50) of sodium n-decyl sulfate using medaka (Oryzias latipes).Our results indicated that the estimated and experimental values were 310 and 420 mg L, respectively, and the difference was within 1.5 times. Since the alkyl carbon chain length of sodium n-decyl sulfate is outside the range of alkyl carbon chain lengths in existing data, the TA estimate obtained in this study was considered an unreliable extrapolated value. Therefore, there was a concern that the basis for the determination of the concentration range in the definitive test was weak. However, it is considered possible to determine the test concentration in the definitive test with higher accuracy by considering relevant available information (e.g., 96-h LC50 of other fish species) in addition to the TA estimate.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76817328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Satoshi Suzuki, T. Hidaka, S. Sano, Gen Yoshida, F. Nishimura
The anaerobic co-digestion of sewage sludge and various types of organic waste produces digestate, which can be used directly as fertilizer. The cultivation of photosynthetic bacteria with digestate is focused on to improve the fertilizer quality. After eight months of enrichment with artificial culture media from a seed of sewage sludge, the accumulation of Rhodospirillaceae, which are known to be photosynthetic bacteria, was observed, and the detection ratio to the total number of reads was 55% by sequencing. Filtered digestate liquor from the anaerobic digestion of sewage sludge was continuously cultivated under light illumination, with the seeding of the enrichment culture only at the beginning. The cultivated liquor had a higher pufM gene copy number, which is an indicator of photosynthetic bacteria. Pot experiments showed that grown komatsuna （ Brassica rapa var. perviridis ） had significantly higher （ t-test, p < 0.05 ） fresh weight and ratios of chlorophyll and carotenoid. These results confirmed that the cultivation of filtered digestate liquor under light illumination improves the fertilizer quality. On the other hand, the cultivation of digestate by the anaerobic digestion of sewage sludge under light illumination with the seeding of the enrichment culture only at the beginning resulted in no significant difference in pot experiments. This showed that the cultivation of filtered digestate liquor under light illumination is practical.
污水污泥与各类有机废弃物厌氧共消化产生的消化液可直接用作肥料。研究了利用消化液培养光合细菌以提高肥料品质的方法。以污水污泥种子为原料，用人工培养基富集8个月后，观察到Rhodospirillaceae的积累，已知为光合细菌，经测序检测，其检出率为总reads数的55%。将过滤后的污水污泥厌氧消化的消化液在光照下连续培养，初始只进行富集培养的播种。培养液中pufM基因拷贝数较高，这是光合细菌的一个指标。盆栽试验结果表明，小松(Brassica rapa var. perviridis)鲜重、叶绿素和类胡萝卜素含量显著高于对照(t检验，p < 0.05)。这些结果证实了在光照下培养过滤后的消化液能提高肥料品质。另一方面，在光照下对污泥进行厌氧消化培养消化液，初期只播种富集培养，盆栽试验结果差异不显著。说明在光照条件下培养过滤后的消化液是可行的。
{"title":"Cultivation of Filtered Anaerobically Digested Sewage Sludge under Light Illumination for Improvement of Fertilizer Quality","authors":"Satoshi Suzuki, T. Hidaka, S. Sano, Gen Yoshida, F. Nishimura","doi":"10.2965/JSWE.44.27","DOIUrl":"https://doi.org/10.2965/JSWE.44.27","url":null,"abstract":"The anaerobic co-digestion of sewage sludge and various types of organic waste produces digestate, which can be used directly as fertilizer. The cultivation of photosynthetic bacteria with digestate is focused on to improve the fertilizer quality. After eight months of enrichment with artificial culture media from a seed of sewage sludge, the accumulation of Rhodospirillaceae, which are known to be photosynthetic bacteria, was observed, and the detection ratio to the total number of reads was 55% by sequencing. Filtered digestate liquor from the anaerobic digestion of sewage sludge was continuously cultivated under light illumination, with the seeding of the enrichment culture only at the beginning. The cultivated liquor had a higher pufM gene copy number, which is an indicator of photosynthetic bacteria. Pot experiments showed that grown komatsuna （ Brassica rapa var. perviridis ） had significantly higher （ t-test, p < 0.05 ） fresh weight and ratios of chlorophyll and carotenoid. These results confirmed that the cultivation of filtered digestate liquor under light illumination improves the fertilizer quality. On the other hand, the cultivation of digestate by the anaerobic digestion of sewage sludge under light illumination with the seeding of the enrichment culture only at the beginning resulted in no significant difference in pot experiments. This showed that the cultivation of filtered digestate liquor under light illumination is practical.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84536190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Katagiri, Taisei Shinoda, Reina Yamashita, Shoya Fukuchi
We propose a method of estimating the overall behavior of filtration using the fouling index obtained from limited membrane filtration data. The blocking index and plugging constant required for estimating filtration behavior were determined from the fouling mechanism index (FMI) with the aid of the blocking filtration law. The calculated data of the variation over time of the flux decline using the blocking index, plugging constant, and membrane properties were in reasonable agreement with experimental data. It was confirmed that this method can be widely applied to estimate membrane filtration behavior regardless of filtration conditions, such as sample concentration and the type of membrane, and fouling mechanisms, such as membrane pore blocking and cake formation. The calculated data of filtration behavior obtained from the membrane properties and FMI are useful because they can be used to determine the timing of membrane cleaning and membrane replacement.
{"title":"Estimation of Filtration Behavior Based on Simplified Evaluation of Membrane Fouling Characteristics","authors":"N. Katagiri, Taisei Shinoda, Reina Yamashita, Shoya Fukuchi","doi":"10.2965/jswe.44.149","DOIUrl":"https://doi.org/10.2965/jswe.44.149","url":null,"abstract":"We propose a method of estimating the overall behavior of filtration using the fouling index obtained from limited membrane filtration data. The blocking index and plugging constant required for estimating filtration behavior were determined from the fouling mechanism index (FMI) with the aid of the blocking filtration law. The calculated data of the variation over time of the flux decline using the blocking index, plugging constant, and membrane properties were in reasonable agreement with experimental data. It was confirmed that this method can be widely applied to estimate membrane filtration behavior regardless of filtration conditions, such as sample concentration and the type of membrane, and fouling mechanisms, such as membrane pore blocking and cake formation. The calculated data of filtration behavior obtained from the membrane properties and FMI are useful because they can be used to determine the timing of membrane cleaning and membrane replacement.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82372550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuta Fujii, K. Mitsuka, Hiroki Ogata, D. Inoue, M. Ike
The objective of this study was to assess the universality of gluconate as a hydrogen donor for the reductive dechlorination of chloroethenes in groundwater. For this, we conducted trichloroethene (TCE) degradation experiments using five groundwater samples collected from different chloroethenes-contaminated sites as the microbial seed and gluconate as the hydrogen donor. Although the TCE dechlorination rate was different in each groundwater, the number of genes involved in reductive dechlorination increased and chloroethenes were completely dechlorinated in all groundwater samples. In addition, the groundwater sample whose complete reductive dechlorination of TCE took a long time could also be treated by repeated gluconate supplementation, which resulted in rapid complete TCE dechlorination without the accumulation of chloroethene, a harmful metabolite. These results indicate that gluconate is a universal hydrogen donor that enables the complete reductive dechlorination of chloroethenes.
{"title":"Universality of Gluconate as a Hydrogen Donor for Reductive Dechlorination of Chloroethenes","authors":"Yuta Fujii, K. Mitsuka, Hiroki Ogata, D. Inoue, M. Ike","doi":"10.2965/jswe.44.69","DOIUrl":"https://doi.org/10.2965/jswe.44.69","url":null,"abstract":"The objective of this study was to assess the universality of gluconate as a hydrogen donor for the reductive dechlorination of chloroethenes in groundwater. For this, we conducted trichloroethene (TCE) degradation experiments using five groundwater samples collected from different chloroethenes-contaminated sites as the microbial seed and gluconate as the hydrogen donor. Although the TCE dechlorination rate was different in each groundwater, the number of genes involved in reductive dechlorination increased and chloroethenes were completely dechlorinated in all groundwater samples. In addition, the groundwater sample whose complete reductive dechlorination of TCE took a long time could also be treated by repeated gluconate supplementation, which resulted in rapid complete TCE dechlorination without the accumulation of chloroethene, a harmful metabolite. These results indicate that gluconate is a universal hydrogen donor that enables the complete reductive dechlorination of chloroethenes.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89395550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yoshiomi Otsuka, H. Takada, Y. Nihei, Y. Kameda, K. Nishikawa
We reviewed the environmental impacts of microplastics, discussed the dynamics of microplastics in the aquatic environment and their impacts on marine ecosystems, and introduced the latest analytical methods for microplastics, especially for samples with small particle sizes. Regarding the situation of microplastics in land areas and rivers, the numerical and mass concentrations of microplastics in rivers all over Japan and the estimated total amount of plastics discharged from Japan’s land areas to the ocean were determined. Regarding the state of microplastics in the sea, the dynamics of microplastics in Tokyo Bay and the uptake of microplastics by marine life were determined. For the analysis of microplastics, the methods of sampling, pretreatment, and equipment measurement and their ploblems were summarized, and a technical perspective was presented. It is essential to clarify the dynamics of microplastics in the environment and their impact on ecosystems in order to plan effective and efficient measures for the proper use and management of plastics in the social system. We hope that the information introduced in this paper will contribute to these activities.
{"title":"Current Status and Issues of Microplastic Pollution Research","authors":"Yoshiomi Otsuka, H. Takada, Y. Nihei, Y. Kameda, K. Nishikawa","doi":"10.2965/JSWE.44.35","DOIUrl":"https://doi.org/10.2965/JSWE.44.35","url":null,"abstract":"We reviewed the environmental impacts of microplastics, discussed the dynamics of microplastics in the aquatic environment and their impacts on marine ecosystems, and introduced the latest analytical methods for microplastics, especially for samples with small particle sizes. Regarding the situation of microplastics in land areas and rivers, the numerical and mass concentrations of microplastics in rivers all over Japan and the estimated total amount of plastics discharged from Japan’s land areas to the ocean were determined. Regarding the state of microplastics in the sea, the dynamics of microplastics in Tokyo Bay and the uptake of microplastics by marine life were determined. For the analysis of microplastics, the methods of sampling, pretreatment, and equipment measurement and their ploblems were summarized, and a technical perspective was presented. It is essential to clarify the dynamics of microplastics in the environment and their impact on ecosystems in order to plan effective and efficient measures for the proper use and management of plastics in the social system. We hope that the information introduced in this paper will contribute to these activities.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76035282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
1) Emeritus Professor of Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan 2) Osaka Branch Office, IDEA Consultants, Inc., 1-24-22 Nanko-kita, Suminoe-ku, Osaka 559-8519, Japan 3) Hyogo Prefectural Institute of Environmental Sciences, Hyogo Environmental Advancement Association, 3-1-18 Yukihira-cho, Suma-ku, Kobe 654-0037, Japan 4) Institute of Environmental Informatics, IDEA Consultants, Inc., 2-2-2 Hayabuchi, Tsuzuki-ku, Yokohama 224-0025, Japan
{"title":"Impact of Nutrient Reduction on Organic Matter (COD and TOC) in Coastal Seas","authors":"T. Fujiwara, Motoharu Suzuki, Kei Okubo, K. Nagao","doi":"10.2965/jswe.44.135","DOIUrl":"https://doi.org/10.2965/jswe.44.135","url":null,"abstract":"1) Emeritus Professor of Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan 2) Osaka Branch Office, IDEA Consultants, Inc., 1-24-22 Nanko-kita, Suminoe-ku, Osaka 559-8519, Japan 3) Hyogo Prefectural Institute of Environmental Sciences, Hyogo Environmental Advancement Association, 3-1-18 Yukihira-cho, Suma-ku, Kobe 654-0037, Japan 4) Institute of Environmental Informatics, IDEA Consultants, Inc., 2-2-2 Hayabuchi, Tsuzuki-ku, Yokohama 224-0025, Japan","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"140 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77694095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Ishii, Tatsuhiko Masuda, H. Ando, Takashi Yamasaki, H. Kiyosawa
{"title":"Distribution and Seasonal Growth of the Invasive Diatom Cymbella janischii in Tamagawa River System","authors":"Y. Ishii, Tatsuhiko Masuda, H. Ando, Takashi Yamasaki, H. Kiyosawa","doi":"10.2965/JSWE.44.51","DOIUrl":"https://doi.org/10.2965/JSWE.44.51","url":null,"abstract":"","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"7 1","pages":"51-57"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87468216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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