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81.
Contributions of humic substances to the dissolved organic carbon pool in wetlands from different climates 总被引:1,自引:0,他引:1
Wetlands are an important source of DOM. However, the quantity and quality of wetlands' DOM from various climatic regions have not been studied comprehensively. The relationship between the concentrations of DOM (DOC), humic substances (HS) and non-humic substances (NHS) in wetland associated sloughs, streams and rivers, in cool temperate (Hokkaido, Japan), sub-tropical (Florida, USA), and tropical (Sarawak, Malaysia) regions was investigated. The DOC ranged from 1.0 to 15.6 mg CL(-1) in Hokkaido, 6.0-24.4 mg CL(-1) in Florida, and 18.9-75.3 mg CL(-1) in Sarawak, respectively. The relationship between DOC and HS concentrations for the whole sample set was regressed to a primary function with y-intercept of zero (P<0.005) and a slope value of 0.841. A similar correlation was observed between DOC and NHS concentrations, with a smaller slope value of 0.159. However, the correlation coefficient of the latter was much larger when the data was regressed to a logarithmic curve. These observations suggest the presence of a general tendency that the increased DOC in the river waters was mainly due to the increased supply of HS from wetland soils, whereas the rate of the increase in the NHS supply has an upper limit which may be controlled by primary productivity. 相似文献
82.
Ioanna Katsiadaki Matthew Sanders Marion Sebire Masaki Nagae Kiyoshi Soyano Alexander P Scott 《Environmental sciences》2007,14(5):263-283
The three-spined stickleback, a small teleost species with habitats that range from full marine to fresh water bodies across the whole Northern hemisphere, has a number of advantages for endocrine disruption research. It is the only teleost species with an unambiguous biomarker for androgens, the presence of the glue protein spiggin in the male kidney, which can be measured by enzyme-linked immunosorbent assay (ELISA). The androgen assay has been adopted to detect antiandrogens in two different ways and an homologous ELISA for stickleback vitellogenin is also available. DNA markers for molecular sex determination are available; thus, sex ratios can also be used for in situ biomonitoring. In addition, the critical period of sexual differentiation has been determined and the occurrence of intersex fish has been reported several times. The species full genome sequence is almost complete. All aspects of stickleback biology (ecology, evolution, behavior, physiology, endocrinology) are well documented. In European waters, the stickleback is the only fish that can bring laboratory and field studies together and allow the true impact of endocrine disruptors on fish populations to be evaluated. 相似文献
83.
Yohei Nakamura Takuro Shibuno David Lecchini Tomohiko Kawamura Yoshiro Watanabe 《Marine Biology》2009,156(11):2413-2419
Successful settlement of pelagic fish larvae into benthic juvenile habitats may be enhanced by a shortened settlement period,
since it limits larval exposure to predation in the new habitat. Because the spatial distribution of marine fish larvae immediately
prior to settlement versus during settlement was unknown, field experiments were conducted at Ishigaki Island (Japan) using
light trap sampling and underwater visual belt transect surveys to investigate the spatial distribution patterns of selected
pre- and post-settlement fishes (Acanthuridae, Pomacentridae, Chaetodonidae and Lethrinidae) among four habitats (seagrass
bed, coral rubble, branching coral and tabular coral). The results highlighted two patterns: patterns 1, pre- and post-settlement
individuals showing a ubiquitous distribution among the four habitats (Acanthuridae) and pattern 2, pre-settlement individuals
distributed in all habitats, but post-settlement individuals restricted to coral (most species of Pomacentridae and Chaetodontidae)
or seagrass habitats (Lethrinidae). The first pattern minimizes the transition time between the larval pelagic stage and acquisition
of a benthic reef habitat, the latter leading immediately to a juvenile lifestyle. In contrast, the second pattern is characterized
by high settlement habitat selectivity by larvae and/or differential mortality immediately after settlement. 相似文献
84.
Photocatalytic degradation of phenol by visible light-responsive iron-doped TiO2 and spontaneous sedimentation of the TiO2 particles 总被引:3,自引:0,他引:3
Fe-doped TiO2 was prepared by the calcination of FexTiS2 (x = 0, 0.002, 0.005, 0.008, 0.01) and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–visible diffuse reflectance spectra. All the Fe-doped TiO2 were composed of an anatase crystal form and showed red shifts to a longer wavelength. The activity of the Fe-doped TiO2 for the degradation of phenol was investigated by varying the iron content during UV (365 nm) and visible light (405 nm and 436 nm) irradiation. The degradation rate depended on the Fe content and the Fe-doped TiO2 was responsive to the visible light as well as the elevated activity toward UV light. The molar ratio of 0.005 was the optimum for both the UV and visible light irradiations. The result was discussed on the basis of the balance of the excited electron–hole trap by the doped Fe3+ and their charge recombination on the doped Fe3+ level. The Fe-doped TiO2 (x = 0.005) was more active than P25 TiO2 under solar light irradiation. The suspended Fe-doped TiO2 spontaneously precipitated once the stirring of the reaction mixture was terminated. 相似文献
85.
86.
Masanao Nagamori Youichi Watanabe Takahito Hase Yasundo Kurata Yusaku Ono Kiyoshi Kawamura 《Journal of Material Cycles and Waste Management》2007,9(1):90-98
To facilitate field surveys for identifying areas of incineration residue-derived soil contamination, a simple and convenient
method with a soil electrical conductivity meter was examined. First, the leaching test specified by Notification No. 13 of
the Ministry of the Environment, 1973, was conducted on 506 samples of 11 types of wastes and compost, and the relationship
between the concentrations of toxic elements [total Hg (T-Hg), Cd, Pb, Cr6+, and As] and values of electrical conductivity (EC) was examined. The results showed that bottom ash and fly ash were wastes
with high EC values and that these wastes indicated higher levels of toxic elements. Second, an estimation method for the
soil EC value of contaminated soil (ECc) was proposed based on the EC values of noncontaminated soil, and its usefulness was
examined. The results of field surveys conducted at sites whose soils were suspected of contamination by dioxins and other
pollutants derived from incineration residues showed that the contaminated spots and areas were identified by using ECc values.
Moreover, comparison of the elemental contents of soils in terms of Cr, Ni, Zn, Na, K, Ca, Fe, Mn, and others, in addition
to the above-mentioned toxic elements (excluding Cr6+), with those of the potential sources of pollution was verified to be effective for identifying the source of soil contamination. 相似文献
87.
Sarmah Purbashree Ishiguro Takeshi Maruyama Kenji Xue Tianle Yamawaki Atsushi Katsumi Takeshi Takai Atsushi Omine Kiyoshi Doi Yoichi 《Journal of Material Cycles and Waste Management》2022,24(6):2183-2200
Journal of Material Cycles and Waste Management - Mechanical properties and slope stability of inert waste landfills under seismic condition were studied with three different approaches: in-situ... 相似文献
88.
Zhang Zichen Omine Kiyoshi Flemmy Samuel Oye 《Journal of Material Cycles and Waste Management》2022,24(6):2291-2302
Journal of Material Cycles and Waste Management - Soft clays with high water content are normally treated by cement or cement-based solidifying agent for utilization as geomaterial in the... 相似文献
89.
Flemmy Samuel O. Omine Kiyoshi Zhang Zichen 《Journal of Material Cycles and Waste Management》2022,24(4):1355-1367
Journal of Material Cycles and Waste Management - The utilization of drinking water sludge (DWS) as geomaterial is important to reduce its volume that needs to be disposed of and to increase... 相似文献
90.
Alias Nurhaswani Hussain Zuhailawati Tan Wai Kian Kawamura Go Muto Hiroyuki Matsuda Atsunori Lockman Zainovia 《Environmental science and pollution research international》2022,29(40):60600-60615
Environmental Science and Pollution Research - In this study, nanoporous anodic film was produced by anodization of niobium, Nb in a fluoride ethylene glycol electrolyte. The effect of anodization... 相似文献