記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

DOI： 10.1016/j.jece.2024.114555

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：American Association for the Advancement of Science (AAAS)  

Rivers and streams contribute to global carbon cycling by decomposing immense quantities of terrestrial plant matter. However, decomposition rates are highly variable and large-scale patterns and drivers of this process remain poorly understood. Using a cellulose-based assay to reflect the primary constituent of plant detritus, we generated a predictive model (81% variance explained) for cellulose decomposition rates across 514 globally distributed streams. A large number of variables were important for predicting decomposition, highlighting the complexity of this process at the global scale. Predicted cellulose decomposition rates, when combined with genus-level litter quality attributes, explain published leaf litter decomposition rates with high accuracy (70% variance explained). Our global map provides estimates of rates across vast understudied areas of Earth and reveals rapid decomposition across continental-scale areas dominated by human activities.

DOI： 10.1126/science.adn1262

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

DOI： 10.1016/j.scitotenv.2024.172236

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

DOI： 10.1016/j.gsd.2024.101087

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

DOI： 10.1016/j.watres.2024.121260

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

DOI： 10.1016/j.ecolmodel.2023.110605

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掲載種別：研究論文（学術雑誌）   出版者・発行元：MDPI AG  

Spatiotemporal changes in waterborne disease risk were evaluated for the Chhnok Tru floating village in the Tonle Sap Lake by combining a hydraulic simulation and quantitative microbial risk assessment (QMRA). First, a three-dimensional (3D) hydraulic simulation was performed, and the transport of Escherichia coli (E. coli) was simulated. Prior to the simulation, by coupling satellite imagery analysis using the normalized difference water index (NDWI) and a sounding survey using an acoustic Doppler current profiler (ADCP), a new digital elevation model was generated for the complex channel network with high resolution. The results of the 3D hydraulic simulation revealed the flow regime and nonuniform pathogen distribution in the floating village. QMRA was performed for the village using the E. coli distribution calculated by the 3D hydraulic model. Subsequently, the disease risk in the village was visualized through an effective and easy-to-understand disease risk map. To demonstrate the usefulness of the hydraulic-simulation-based disease risk map, the map was used to quantitatively compare simple policies by evaluating their reduction in disease risk.

DOI： 10.3390/w15234199

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Man-made reservoirs are important for human daily lives and offer different functions, however they are contaminated due to anthropogenic activities. Dissolved organic matter (DOM) from each reservoir is unique in composition, which further determines its photo-reactivity. Thus, this study aimed to investigate the photo-reactivity of reservoir DOM in terms of the quantum yield for photo-production of singlet oxygen (Ф1O2). We sampled surface water of 50 reservoirs in Japan and determined their Ф1O2 using simulated sunlight together with bulk water analysis. Their Ф1O2 ranged from 1.46 × 10-2 to 6.21 × 10-2 (mean, 2.55 × 10-2), which was identical to those of lakes and rivers reported in the literature, but lower than those of wetland water and wastewater. High-energy triplet-state of DOM accounted for 59.4% of the 1O2 production in the reservoir water on average. Among the bulk water properties, the spectral slope of wavelength from 350 to 400 nm (S350-400) was statistically detected as the most important predictor for Ф1O2. Furthermore, the multiple linear regression model employed S350-400 and the biological index as predictors with no intercorrelations and reasonable accuracy (r2 = 0.86), while the random forest model showed a better accuracy (r2 = 0.90). Overall, these major findings are beneficial for understanding the photo-reactivity of reservoir waters.

DOI： 10.1016/j.watres.2023.120456

PubMed

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記述言語：英語  

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記述言語：英語  

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Informa UK Limited  

DOI： 10.1080/00986445.2023.2218276

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/photochem3020017

Web of Science

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/land12050993

Web of Science

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Photochemical reactions widely occur in the aquatic environment and play fundamental roles in aquatic ecosystems. In particular, solar-induced photodegradation is efficient for many organic micropollutants (OMPs), especially those that cannot undergo hydrolysis or biodegradation, and thus can mitigate chemical pollution. Recent reports indicate that photodegradation may play a more important role than biodegradation in many OMP transformations in the aquatic environment. Photodegradation can be influenced by the water matrix such as pH, inorganic ions, and dissolved organic matter (DOM). The effect of the water matrix such as DOM on photodegradation is complex, and new insights concerning the disparate effects of DOM have recently been reported. In addition, the photodegradation process is also influenced by physical factors such as latitude, water depth, and temporal variations in sunlight as these factors determine the light conditions. However, it remains challenging to gain an overview of the importance of photodegradation in the aquatic environment because the reactions involved are diverse and complex. Therefore, this review provides a concise summary of the importance of photodegradation and the major processes related to the photodegradation of OMPs, with particular attention given to recent progress on the major reactions of DOM. In addition, major knowledge gaps in this field of environmental photochemistry are highlighted.

DOI： 10.1016/j.watres.2022.118236

PubMed

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/su15032082

Web of Science

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記述言語：日本語   出版者・発行元：公益社団法人 日本水環境学会  

下水道では流入水質に応じた効率的な処理を行うことが重要であるが, 都市部における下水の一般水質特性と集水域特性の対応は解明されていない。そこで, 本研究では東京都区部における10年間 (2010年度～2019年度) の変化を対象とし, 人口, 土地, 嗜好などに関する集水域特性の時空間分布を整理した上で, 集水域特性と下水道水質の時空間的対応を統計的に解析した。その結果, BODおよび全窒素濃度の年平均値は昼間人口密度が増加すると濃度が高いという傾向が示され, 年単位で下水道水質と昼間人口密度および土地利用に空間的対応があることが示された。また, 月単位の解析では, 下水道水質と光熱・水道支出や月平均気温の間に季節的な対応も確認され, それらを総合評価することで両者の時空間的対応を解明した。以上より, 効率的な下水処理を行うために, これらの集水域特性を考慮した水質予測モデルが有効となることも示唆された。

DOI： 10.2965/jswe.46.35

DOI： 10.3739/rikusui.85.87_references_DOI_HCONJ0wq3MQjHD0uDWHP52q0JDK

CiNii Research

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記述言語：英語  

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記述言語：英語  

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記述言語：英語  

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記述言語：英語  

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記述言語：英語  

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記述言語：英語  

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記述言語：英語  

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記述言語：英語  

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記述言語：英語  

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

DOI： 10.1016/j.chemosphere.2022.134106

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

DOI： 10.1016/j.envadv.2022.100176

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

DOI： 10.1016/j.chemosphere.2021.132318

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Royal Society of Chemistry (RSC)  

Monitoring bacteria is essential for ensuring microbial safety of water sources, including river water and treated wastewater.

DOI： 10.1039/d1va00017a

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掲載種別：論文集(書籍)内論文   出版者・発行元：Springer Nature Singapore  

DOI： 10.1007/978-981-16-6632-2_18

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Science and Business Media LLC  

DOI： 10.1007/s10661-021-09649-z

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その他リンク： https://link.springer.com/article/10.1007/s10661-021-09649-z/fulltext.html

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：MDPI AG  

Even though wind, water depth, and shear stress are important factors governing sediment resuspension in lakes, their actual relations to total suspended solids (TSS) distribution in natural environments have not been well elucidated. This study aims to elucidate the impact of the wind on the spatio-temporal variation of TSS in Tonle Sap Lake, Cambodia, during low-water (March and June, <1 m) and high-water (September and December, 8–10 m) seasons. To this end, wind and TSS data for December 2016 and March, June, and September 2017 were collected and analyzed. For spatial interpolation of wind speed, the inverse distance weighted method was found to be better (R2 = 0.49) than the vectorized average (R2 = 0.30) and inverse of the ratio of distance (R2 = 0.31). Spatial interpolation showed that the wind speed and direction on the lake were <5 m/s and southward during the low-water season and <7 m/s and westward during the high-water season. The TSS concentration in the low-water season was higher (>50 mg/L) than that in the high-water season. The TSS concentration during the low-water season was empirically described by wind speed (W), water depth (D), and shear stress (τ_wave) with a function of W3, W3/D, and exp(W/D) or exp(τ_wave), depending on the location in the lake. The critical shear stress due to wind-induced waves at most of the places in the lake was higher than the total shear stress indicated. Sedimentation was predominant in December and June, and erosion (siltation) was dominant in March. Most of the siltation in March was dominant in the southern part of the lake.

DOI： 10.3390/earth2030025

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Science and Business Media LLC  

DOI： 10.1007/s11356-021-15205-6

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その他リンク： https://link.springer.com/article/10.1007/s11356-021-15205-6/fulltext.html

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IWA Publishing  

Abstract

The main objective of this research was to explore the fluorescence quenching mechanism of a humic substance (Suwannee River natural organic matter (SWNOM)) to amino acids (tryptophan, tyrosine) and protein (bovine serum albumin, (BSA)) by multi-spectroscopic methods. The locations of the peaks of tryptophan, tyrosine, and BSA from Parallel Factor Analysis were at Ex/Em 280/356 nm, 275/302 nm, and 280/344 nm, respectively. For SWNOM, two peaks appeared at Ex/Em of 240/448 nm, and 350/450 nm. Static quenching was the dominant quenching mechanism between BSA and SWNOM, whereas no quenching was observed between tryptophan or tyrosine and SWNOM. Fourier-transform infrared spectroscopy and thermodynamic calculation demonstrated that hydrogen bonding and van der Waals force are the potential binding forces of the BSA-SWNOM complex, as a result of rearrangement in the secondary polypeptide carbonyl hydrogen bonding network of BSA. This rearrangement led to the conformational change in BSA that induced quenching of BSA fluorescence by SWNOM.

DOI： 10.2166/ws.2021.103

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Science and Business Media LLC  

DOI： 10.1007/s11270-021-05084-5

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その他リンク： https://link.springer.com/article/10.1007/s11270-021-05084-5/fulltext.html

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Science and Business Media LLC  

DOI： 10.1007/s11355-020-00435-6

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その他リンク： http://link.springer.com/article/10.1007/s11355-020-00435-6/fulltext.html

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IWA Publishing  

Abstract

Fluorescence quenching of proteinaceous substances by natural organic matter is a well-known phenomenon, but there are no known methods for correcting it. The main objective of this research was to develop an empirical equation to correct the fluorescence quenching of different concentrations of bovine serum albumin (BSA – 0.15, 0.25, 0.5, 0.75, 1, 1.25 μmol/L (μM)) by Suwannee river natural organic matter (SWNOM - 0,2,4,6,8,10 mg-C/L) using the fluorescence titration method. The excitation emission matrix (EEM) data were analyzed by parallel factor analysis with inner filter effect removal. With increasing SWNOM concentration, BSA peak intensity quenching was in the range 29–85%, with a linear relationship for increment of either BSA or SWNOM concentration. A higher ratio of SWNOM to BSA resulted in greater BSA peak intensity quenching. The unquenched BSA peak (BSA (RU)) is given by the empirical equation.

The calculated unquenched BSA peak intensities using the empirical equation agreed well with the actual unquenched peak values (R2 = 0.98, mean absolute error = 0.33 RU). The equation is expected to help in rapid estimation of the quenching effect of SWNOM on BSA.

DOI： 10.2166/wpt.2021.001

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

DOI： 10.1016/j.agee.2020.107123

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：MDPI AG  

Photocatalytic nanofiltration (NF) membranes with enhanced flux and anti-fouling properties were prepared from a layered in situ nanocomposite of metal organic framework (i.e., UiO-66) and graphene oxide (UiO-66_GO) on a polyamide NF membrane using a pressure-assisted self-assembly method. For filtering pure water and humic acid, the composite membrane with a 10% UiO-66_GO loading (UiO-66_GO/NF-10%) showed a higher water flux (up to 63 kg/m2 h bar), flux recovery (80%), and total fouling resistance (33%) than the pristine NF membrane. Physical and chemical characterization revealed that this performance was attributed to improvements in hydrophilicity, porosity, surface smoothness, and charge repulsion. The UiO-66_GO/NF-10% composite membrane exhibited better physical stability with a relatively low mass loss (8.64%) after five washes than the membranes with mass loadings of 5 and 15 wt%. Furthermore, the UiO-66_GO/NF-10% composite membrane exhibited considerable photocatalytic activity under ultraviolet (UV) irradiation (bandgap: 3.45 eV), which reduced irreversible fouling from 20.7% to 2.4% and increased flux recovery to 98%. This study demonstrated that surface modification with the UiO-66_GO nanocomposite produced a high-flux anti-fouling photocatalytic NF membrane, which is promising for water purification.

DOI： 10.3390/catal10060711

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer International Publishing  

DOI： 10.1007/978-3-030-43484-7_26

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：EDP Sciences  

Species distribution models (SDMs) have been used to understand the habitat suitability of key species. Habitat suitability plots, one outcome from SDMs, are valuable for understanding the habitat suitability and behavior of organisms. The sample size is often constrained by budget and time, and could largely influence the reliability of habitat suitability plots. To understand the effect of sample size on habitat suitability plots, the present study utilized random forests (RF) combined with partial dependence function. And the bluegill (Lepomis macrochirus), a main exotic fish species in the Japan rivers, was selected as target species in this study. Total of 1010 samples of bluegill observations along with four environmental variables were surveyed by the National Censuses on River Environments. The area under curves was calculated after generating RF models, to assess the predictive model performance, and this process was repeated 1000 times. To draw habitat suitability plots, we applied partial dependence function to the formulated RF models, and 15 different sample sizes were set to examine the effect on habitat suitability plots. We concluded that habitat suitability plots are affected by sample size and prediction performance. Notably, habitat suitability plots drawn from the sample size of 50 greatly varied among the 1000-time iterations, and they are all different from the observations. Furthermore, to deal with the case of limited samples, we proposed a novel approach “averaged habitat suitability plot” for delineating habitat suitability plots. The proposed approach enables us to assess the habitat suitability even with a small sample size.

DOI： 10.1051/limn/2020010

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：MDPI AG  

Nanocomposites of UiO-66 and graphene oxide (UiO-66_GO) were prepared with different GO contents by a one-step hydrothermal method, and their photocatalytic activities for the degradation of carbamazepine (CBZ) were investigated under ranges of GO loading, catalyst dose, initial pollutant concentration, and solution pH. The UiO-66_GO nanocomposites showed photocatalytic rate constant up to 0.0136 min−1 for CBZ degradation and its high overall removal efficiency (>90%) in 2 h. The photocatalytic rate constant over the UiO-66_GO nanocomposite was about 2.8 and 1.7 times higher than those over pristine GO and UiO-66, respectively. The enhancement of photocatalytic activity by GO was attributed to increased surface area and porosity, improved light absorption, and narrowed band gap. The composite also showed substantial recyclability and stability over five consecutive cycles of photocatalytic degradation. The experimental results indicated that O2●− and OH● are the responsible radicals for photocatalytic degradation, which helped us propose a photocatalytic mechanism for the enhanced CBZ photodegradation. This work provides a reference for the development of GO-based composite photocatalysts and expands the application of UiO-66 as a photocatalyst for the degradation of persistent micropollutants in water.

DOI： 10.3390/jcs4020054

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.ecss.2019.106580

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

DOI： 10.1016/j.watres.2020.115643

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：American Society of Civil Engineers (ASCE)  

DOI： 10.1061/(asce)ir.1943-4774.0001439

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掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/hyp.13525

Web of Science

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その他リンク： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/hyp.13525

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1126/sciadv.aav0486

Web of Science

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

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記述言語：日本語  

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.chemosphere.2017.04.008

Web of Science

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1371/journal.pone.0176484

Web of Science

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.scitotenv.2016.10.068

Web of Science

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：土木学会  

DOI： 10.2208/jscejhe.73.I_1201

CiNii Books

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.watres.2016.07.033

Web of Science

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記述言語：日本語  

Iron is an important trace element for the growth of phytoplankton in natural waters. Primary production in coastal water is considered to be maintained by the supply of terrigenous iron that migrates downstream via surface water and ground water flow. In this review, we summarize previous studies on iron biogeochemistry in coastal and freshwater systems with particular emphasis to the influence of dissolved organic matter and its quality on the iron transformation kinetics and the iron availability to phytoplankton in coastal waters. A number of previous studies, particularly those in the field of ocean science revealed that in air-saturated water at circumneutral pH, the solubility of inorganic ferric iron is at the subnanomolar level, whereas the presence of dissolved organic matter substantially increases the iron solubility. In addition to iron coordination by organic ligands, other reactions, including photochemical and thermal redox reactions, are also related to iron bioavailability. Given that iron bioavailability to phytoplankton is tightly associated with its speciation, studies on iron chemical speciation is necessary to properly assess the contribution of terrigenous iron in coastal primary productivity. Finally, to understand the connection between terrigenous iron and coastal primary productivity, integrated studies that cover not only the iron speciation and availability in freshwater and coastal waters but also the hydrochemical processes associated with terrigenous iron runoff are recommended.

DOI： 10.2965/jswe.39.197

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s10201-015-0458-3

Web of Science

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.2208/jscejer.71.III_287

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.14862/geochemproc.62.0_263

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/es405496b

Web of Science

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記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Japan Society of Civil Engineers  

本研究では自然水中に広く存在する腐植物質が第一鉄(Fe(II))の酸化速度に及ぼす影響を解明することを目的として, pH 8における溶存酸素(0₂)および過酸化水素(H₂O₂)によるFe(II)の各酸化速度定数(k_O2およびk_H2O2)を測定した. 酸化実験より得られた速度定数はいずれも腐植物質の種類により異なったが, 0₂による酸化速度は腐植物質存在下で増大した. また, k_H202と腐植物質中の芳香族炭素割合およびカルボキシル基量との間にそれぞれ有意な相関が認められた. 本研究の結果から, 腐植物質との錯形成はFe(II)の酸化速度に影響を及ぼし, その程度は腐植物質中の鉄結合部位の種類, 量, 荷電特性等に依存することが示唆された.

DOI： 10.2208/jscejer.69.iii_291

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記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Japan Society of Civil Engineers  

本研究では，タリアメント川（イタリア）中流の洪水氾濫原を対象に，生息場とその生息場条件と水中堆積物の質的および量的特性の関係を明らかにし，さらに，水中堆積物に付着する微生物に着目して呼吸活性と堆積物特性との関係を明らかにすることを目的とした．洪水氾濫原における調査の結果，本流と上流で接続のある生息場では河床堆積物の粒径が大きくC/N比は高くなり，樹木の多い生息場では微細堆積物密度と微細有機物の含有率が高くなるという特徴が明らかとなった．また，微細堆積物量と微細有機物の含有率は溶存酸素消費係数と強い正の相関性が確認され，水中での溶存酸素消費濃度は生息場のタイプや堆積物の質や量により大きく影響を受けることが示された．

DOI： 10.2208/jscejer.68.III_205

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記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Japan Society of Civil Engineers  

植物プランクトンへの鉄供給プロセスの観点から，本研究では腐植物質の化学的性質が鉄との錯形成に及ぼす影響について調べた．pH 8において競合リガンド法により，様々な起源をもつ標準腐植物質と鉄の錯形成を調べ，錯化容量と条件付き安定度定数について多様な値が得られた．これら錯形成パラメータと元素分析・¹³C-NMR・酸塩基滴定から得られた腐植物質の構成元素比・炭素種割合・官能基量との関係を調べた結果，芳香族炭素割合と錯化容量には有意な正の相関がみられ，芳香族領域にある官能基が主な鉄結合部位であることが推測された．さらに，安定度定数は硫黄や窒素含有量と弱いが有意な正の相関があり，スルホン基やアミノ基を含む腐植物質は鉄と高い親和性を有する可能性が示唆された．

DOI： 10.2208/jscejer.68.III_525

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/jp202440e

Web of Science

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s10533-010-9412-y

Web of Science

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記述言語：日本語   出版者・発行元：公益社団法人 土木学会  

粒状有機物動態に対する試験湛水期のダム（徳山ダム）の影響を解明するために，揖斐川上流域の森林河川を対象として2007年8∼12月に調査を実施した．その結果，ダムの影響がない地点では粒径1μm以上のすべての画分で他生性有機物（河畔林由来）が優占しており，2mm以上のPOMでのみ落葉期に対応した季節変化が見られた．ダム直下では粒径2mm以上のPOMでのみ有機炭素濃度が低下していた．また，粒径63μm∼2mmのPOMでは下流3km区間でダム由来の POMの約50%が交換されていることが示唆され，1∼63μmのPOMではダム下流でも土壌由来有機物が優占することが示された．よって，試験湛水期におけるダム貯水池での一次生産の低さが，ダム下流河川での有機物動態にも反映されていたと考えられた．

DOI： 10.2208/jscejg.65.237

J-GLOBAL

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記述言語：日本語   出版者・発行元：公益社団法人 土木学会  

河川の病原ウイルス濃度が土地利用や河川水質とどのような関係にあるかを解明するために, 岐阜市およびその周辺の都市河川の20地点でF特異RNAファージおよび菌体表面吸着ファージ濃度を2007年-2008年の冬季に調査した, その結果, 大腸菌ファージ濃度は農地で最も高く, 次いで都市, 森林の順であった. ただし, 下水処理水が流入する区間の濃度は都市部より低かった. その結果, 中核都市では下水道が整備されている中心部で病原ウイルス濃度が抑えられているが, その周辺の農地と住宅が混在するような地区では濃度が高い可能性が示唆され, 水環境における病原微生物の管理に対して面源汚染としての評価の必要性が示された.

DOI： 10.11532/proes1992.45.379

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記述言語：日本語   出版者・発行元：日本陸水学会  

DOI： 10.14903/jslim.71.0.28.0

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記述言語：日本語  

DOI： 10.2208/jscejg.62.74

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記述言語：日本語   出版者・発行元：公益社団法人 日本水環境学会  

Switzerland is the primary "watershed of Europe." The Swiss Alps feeds all major Central European rivers including the Rhône, Danube, Rhine and Po. The country also plays a very active international role in environmental affairs since many multinational organizations such as the United Nations, the International Union for Conservation of Nature and Natural Resources (IUCN) and the Ramsar Convention are based in Switzerland. In the present paper we give a brief overview of the water policy of Switzerland and provide selected examples of the state and trends of the water environment. The most fundamental principles in water management were formulated in the Water Protection Law in 1991 and subsequently updated in 1991. In it, the protection of groundwater and the maintenance of residual flow in rivers and streams were manifested. Ground water supplies 80 % of the total water consumption of the human population. Local authorities identify groundwater protection areas, and unpolluted wastewater such as storm water is also used to recharge the aquifer. Furthermore, minimum residual flows are calculated to maintain the ecological integrity of rivers and streams. Finally, we compare the Swiss situation with the water conservation policy in Japan.

DOI： 10.2965/jswe.26.93

CiNii Books

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その他リンク： https://jlc.jst.go.jp/DN/JALC/00163980607?from=CiNii

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Japan Society of Civil Engineers  

Experiments on the leaching of DOM from riverine POM fractions were conducted to investigate the qualitative and quantitative formation of dissolved organic matter (DOM). Amphipods (Gammarus sp.) were fed in the laboratory with preconditioned leaves of Fraxinus excelsior, Alnusincana, and Querrus robur, twigs of Populus nigra, and epilithic algae (periphyton). Amphipods produced two FPOM fractions (L-FPOM: 250-500μm; M-FPOM; 100-250μm). L-FPOM consisted primarily of fecal pellets while M-FPOM was mainly composed of CPOM fragments created by the feeding activity. FPOM fractions and CPOM were exposed in 100ml Erlenmeyer bottles and stirred at 100rpm at 12°C under dark conditions. DOC release rate, UV absorption (E285) and microbial respiration (Biological Oxygen Demand in 3 days) were repeatedly measured over a 14-day period.<BR>FPOM exhibited significantly lower DOC release rate than CPOM in first 24 hours of the experiment while it was slightly higherthan CPOM in the second week. DOM release rate from air-dried leaves (CPOM) was significantly correlated with chlorophyll acontent. Microbial respiration suggested that POM was converted by bacterial community into more refractory compound whilereleasing relatively labile DOM. In addition, POM derived from epilithic algae showed distinct leaching mechanism from allochthonous POM.

DOI： 10.11532/proes1992.40.139

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.11532/proes1992.35.415

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記述言語：英語  

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記述言語：英語  

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記述言語：英語  

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記述言語：英語  

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記述言語：英語  

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記述言語：英語  

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記述言語：英語  

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記述言語：日本語  

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記述言語：英語  

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記述言語：英語  

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記述言語：英語  

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記述言語：英語  

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記述言語：英語  

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記述言語：英語  

DOI： 10.3825/ece.9.85

Scopus

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開催年月日： 2024年6月

記述言語：英語   会議種別：口頭発表（一般）  

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記述言語：英語   会議種別：口頭発表（一般）  

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記述言語：日本語   会議種別：ポスター発表  

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記述言語：日本語   会議種別：口頭発表（一般）  

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記述言語：英語   会議種別：口頭発表（一般）  

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記述言語：英語   会議種別：口頭発表（一般）  

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記述言語：英語   会議種別：口頭発表（一般）  

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記述言語：日本語   会議種別：口頭発表（一般）  

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記述言語：英語   会議種別：ポスター発表  

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記述言語：英語   会議種別：ポスター発表  

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記述言語：日本語   会議種別：口頭発表（一般）  

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記述言語：英語   会議種別：口頭発表（一般）  

開催地：Semarang   国名：インドネシア共和国  

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記述言語：英語   会議種別：口頭発表（一般）  

開催地：Semarang   国名：インドネシア共和国  

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