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31.
Mari Egawa Kentaro Aoki Yongkun Sun Toshiyuki Hosokawa Takeshi Saito Masaaki Kurasaki 《Journal of environmental science and health. Part. B》2013,48(3):196-204
Alkyl esters of p-hydroxybenzoic acids (parabens), an endocrine disrupter, are used as preservatives in cosmetics and foods. In this study, to understand the relationship between parabens and differentiation in infants, the effects of parabens on apoptosis induced by serum deprivation in PC12 cells were investigated. In addition, apoptosis-related factors were assayed. As results, a tendency toward enhancement of apoptosis was observed in the cells cultured in the serum-free medium with methylparaben, and this tendency was suggested to be related to the contents of BAD, a pro-apoptotic protein. Butylparaben did not show any tendency to enhance apoptosis. 相似文献
32.
33.
A novel cell division factor from tobacco 2B-13 cells that induced cell division in auxin-starved tobacco BY-2 cells 总被引:1,自引:0,他引:1
Shimizu T Eguchi K Nishida I Laukens K Witters E Van Onckelen H Nagata T 《Die Naturwissenschaften》2006,93(6):278-285
Effects of auxin as plant hormones are widespread; in fact in almost all aspects of plant growth and development auxin plays
a pivotal role. Although auxin is required for propagating cell division in plant cells, its effect upon cell division is
least understood. If auxin is depleted from the culture medium, cultured cells cease to divide. It has been demonstrated in
this context that the addition of auxin to auxin-starved nondividing tobacco BY-2 cells induced semisynchronous cell division.
On the other hand, there are some cell lines, named habituated cells, that can grow without auxin. The cause and reason for
the habituated cells have not been clarified. A habituated cell line named 2B-13 is derived from the tobacco BY-2 cell line,
which has been most intensively studied among plant cell lines. When we tried to find the difference between two cell lines
of BY-2 and 2B-13 cells, we found that the addition of culture filtrated from the auxin-habituated 2B-13 cells induced semisynchronous
cell division in auxin-starved BY-2 cells. The cell division factor (CDF) that is responsible for inducing cell division in
auxin-starved BY-2 cells was purified to near-homogeneity by sequential passage through a hydroxyapatite column, a ConA Sepharose
column and a Sephadex gel filtration column. The resulting purified fraction appeared as a single band of high molecular weight
on sodium dodecyl sulfate-polyacrylamide gel electrophoresis gels by silver staining and was able to induce cell division
in auxin-starved BY-2 cells. Identification of the protein by MALD-TOF-MS/MS revealed that it is structurally related to P-glycoprotein
from Gossypioides kirkii, which belongs to ATP-binding cassette (ABC)-transporters. The significance of CDF as a possible ABC-transporter is discussed
in relationship to auxin–autotrophic growth and auxin-signaling pathway. 相似文献
34.
Masahide Aikawa Toshimasa Ohara Takatoshi Hiraki Okihiro Oishi Akihiro Tsuji Makiko Yamagami Kentaro Murano Hitoshi Mukai 《Atmospheric environment (Oxford, England : 1994)》2010,44(3):381-391
We found a significant geographic gradient (longitudinal and latitudinal) in the sulfate (SO42?) concentrations measured at multiple sites over the East Asian Pacific Rim region. Furthermore, the observed gradient was well reproduced by a regional chemical transport model. The observed and modeled SO42? concentrations were higher at the sites closer to the Asian continent. The concentrations of SO42? from China as calculated by the model also showed the fundamental features of the longitudinal/latitudinal gradient. The proportional contribution of Chinese SO42? to the total in Japan throughout the year was above 50–70% in the control case, using data for Chinese sulfur dioxide (SO2) emission from the Regional Emission Inventory in Asia (40–60% in the low Chinese emissions case, using Chinese SO2 emissions data from the State Environmental Protection Administration of China), with a winter maximum of approximately 65–80%, although the actual concentrations of SO42? from China were highest in summer. The multiple-site measurements and the model analysis strongly suggest that the SO42? concentrations in Japan were influenced by the outflow from the Asian continent, and this influence was greatest in the areas closer to the Asian continent. In contrast, we found no longitudinal/latitudinal gradient in SO2 concentrations; instead SO2 concentrations were significantly correlated with local SO2 emissions. Our results show that large amounts of particulate sulfate are transported over long distances from the East Asian Pacific Rim region, and consequently the SO42? concentrations in Japan are controlled by the transboundary outflow from the Asian continent. 相似文献
35.
Removal of heavy metals in rinsing wastewater from plating factory by adsorption with economical viable materials 总被引:8,自引:0,他引:8
Katsumata H Kaneco S Inomata K Itoh K Funasaka K Masuyama K Suzuki T Ohta K 《Journal of environmental management》2003,69(2):187-191
The removal of heavy metals from plating factory wastewater with economical materials was investigated by the column method. Montmorillonite, kaolin, tobermorite, magnetite, silica gel and alumina were used as the economical adsorbents to wastewater containing Cd(II), Cr(VI), Cu(II) and Pb(II). This removal method of heavy metals proved highly effective as removal efficiency tended to increase with increasing pH and decrease with increasing metal concentration. The removal percentages by adsorption onto montmorillonite, tobermorite, magnetite, and silica gel showed high values for all metals. From the results for the heat of adsorption, the adsorption process in the present study might be chemisorption. The proposed method was successfully applied to the removal of Cd(II), Cr(VI) and Cu(II) in rinsing wastewater from plating factory in Nagoya City, Aichi Prefecture, Japan. Since the economical adsorbents used can be obtained commercially because they are easily synthesized, the wastewater treatment system developed is rapid, simple and cheap for the removal of heavy metals. 相似文献
36.
In vivo exposure of rats to 10 ppm nitrogen dioxide (NO2) for 12h caused changes in fatty acids composition of alveolar lavage phospholipids. Among the fatty acid species, the relative ratio of palmitic acid, myristic acid and palmitoleic acid increased significantly. While the relative ratio of stearic acid, oleic acid, linoleic acid and arachidonic acid decreased significantly. Both the increase in the incorporation of palmitic acid in phosphatidylcholine which would be released into the alveoli and the increase in the release of phosphatidylcholine into the alveoli may account for the changes in the fatty acid composition of the present findings. 相似文献
37.
Golam Saleh Ahmed Salem So Kazama Shamsuddin Shahid Nepal C. Dey 《Mitigation and Adaptation Strategies for Global Change》2018,23(6):953-979
The effects of a 1.5 °C global change on irrigation costs and carbon emissions in a groundwater-dependent irrigation system were assessed in the northwestern region of Bangladesh and examined at the global scale to determine possible global impacts and propose necessary adaptation measures. Downscaled climate projections were obtained from an ensemble of eight general circulation models (GCMs) for three representative concentration pathways (RCPs), RCP2.6, RCP4.5, and RCP8.5 and were used to generate the 1.5 °C warming scenarios. A water balance model was used to estimate irrigation demand, a support vector machine (SVM) model was used to simulate groundwater levels, an energy-use model was used to estimate carbon emissions from the irrigation pump, and a multiple linear regression (MLR) model was used to simulate the irrigation costs. The results showed that groundwater levels would likely drop by only 0.03 to 0.4 m under a 1.5 °C temperature increase, which would result in an increase in irrigation costs and carbon emissions ranging from 11.14 to 148.4 Bangladesh taka (BDT) and 0.3 to 4% CO2 emissions/ha, respectively, in northwestern Bangladesh. The results indicate that the impacts of climate change on irrigation costs for groundwater-dependent irrigation would be negligible if warming is limited to 1.5 °C; however, increased emissions, up to 4%, from irrigation pumps can have a significant impact on the total emissions from agriculture. This study revealed that similar impacts from irrigation pumps worldwide would result in an increase in carbon emissions by 4.65 to 65.06 thousand tons, based only on emissions from groundwater-dependent rice fields. Restricting groundwater-based irrigation in regions where the groundwater is already vulnerable, improving irrigation efficiency by educating farmers and enhancing pump efficiency by following optimum pumping guidelines can mitigate the impacts of climate change on groundwater resources, increase farmers’ profits, and reduce carbon emissions in regions with groundwater-dependent irrigation. 相似文献
38.
Leaching of heavy metals in acid mine drainage. 总被引:1,自引:0,他引:1
Acid mine drainage is one of the most serious environmental problems that the coal and metal mining industry is currently facing. The generation of low pH drainage enhances the dissolution of heavy metals in water. The samples used in this research originated from three pits at mine dumps. In a study reported in this paper, three types of tests; namely static test, kinetic test and column test were conducted to estimate acid generation and acid neutralization reaction rates, and to predict the solubility of metals and their release rates. Static test showed that all samples had a pH of net acid generation (NAG pH) <4, a net acid producing potential (NAPP) >10 kg H2SO4tonne(-1), and a S-content >3%, which can be classified as a high acid-forming capacity. Simulated runoff in the column tests was equivalent to 5-year average rainfall in Indonesia, the resultant leachates showed acidic behaviour (pH < 3.5). Based on the results, it was found that high mobilization of heavy metals (Cr, Cu, Zn, Cd and Pb) takes place under strong acidic conditions (pH approximately equal 2). 相似文献
39.
Voltammetric response of ferroceneboronic acid to diol and phenolic
compounds as possible pollutants
Shigehiro Takahashi Naoyuki Abiko Nobuhiro Haraguchi Hiroyuki Fujit Eriko Seki Tetsuya Ono Kentaro Yoshi Jun-ichi Anzai 《环境科学学报(英文版)》2011,23(6):1027-1032
A voltammetric determination of possible organic pollutants such as diol and phenolic compounds in water was studied using
ferroceneboronic acid (FBA) as a redox-active marker. A cyclic voltammogram of FBA exhibited a pair of oxidation and reduction
peaks at 230 and 170 mV at pH 7.0, respectively, while another pair of redox peaks was observed in the presence of diol or phenolic
compounds tested. The results were rationalized based on the formation of boronate esters of FBA with the added compounds. The
changes in the redox peak currents were dependent on the concentration of the additives, suggesting a usefulness of FBA in the
electrochemical determination of these compounds in water. 相似文献
40.
Kentaro Hayashi Takeshi TokidaToshihiro Hasegawa 《Agriculture, ecosystems & environment》2011,144(1):117-123
The present study aimed to investigate the potential ammonia (NH3) emission from flag leaves of paddy rice (Oryza sativa L. cv. Koshihikari). The study was conducted at a paddy field in central Japan that was designed as a free-air CO2 enrichment (FACE) facility for paddy rice. A dynamic chamber method was used to measure the potential NH3 emissions. The air concentrations of NH3 at two heights (2 and 6 m from the ground surface) were measured using a filter-pack method, and the exchange fluxes of NH3 of the whole paddy field were calculated using a gradient method. The flag leaves showed potential NH3 emissions of 25-38 ng N cm−2 h−1 in the daytime from the heading to the maturity stages, and they showed potentials of approximately 22 ng N cm−2 h−1, even in the nighttime, at the heading and mid-ripening stages. The exchange fluxes of NH3 of the whole paddy field in the daytime were net emissions of 0.9-3.9 g N ha−1 h−1 whereas the exchange fluxes of NH3 in the nighttime were approximately zero. 相似文献