Search results for: 2-Aminoimidazole Sulfate C3H5N0 (ŒH’”ÓÍÐTÎˆM LNLËM
#33984788 2021/05/05 To Up
Efficient peroxydisulfate activation with nZVI/[email protected] nanocomposite derived from wastes for degradation of tetrabromobisphenol A in alkaline environment.Peroxydisulfate (PDS) is a promising oxidant for sulfate radical based advanced oxidation processes (SAOPs), however its efficient activation is still a challenge. In this study, biochar-supported nano-zerovalent iron (nZVI) and copper oxide (CuO) nanocomposite (nZVI/[email protected]), derived from low-cost wastes including scrap iron filings, copper leaching solution and corn stalks, was successfully fabricated for PDS activation to enhance tetrabromobisphenol A (TBBPA) degradation in alkaline environment. Under the conditions of 100Â mg/L nZVI/[email protected], 0.2Â mM PDS, pH 8.0 and 25Â Â°C, 86.32% of PDS was activated and 98.46% of TBBPA was degraded within 45Â min in nZVI/[email protected] PDS system. When the PDS concentration was 2Â mM, the nZVI/[email protected] PDS system realized efficient debromination and mineralization of TBBPA at the ratio of 79.12% and 79.36%, respectively. The results of EPR studies and radical scavenger experiments revealed that both hydroxyl radical (Â·OH) and sulfate radical (SO) were responsible for TBBPA degradation. The nZVI could active PDS indirectly through electron transfer mechanism and exhibited synergistic effects with CuO on PDS activation. Furthermore, the nZVI/[email protected] PDS system showed good potential to degrade TBBPA in real water environment. Therefore, nZVI/[email protected] could be a novel strategy for efficient PDS activation and TBBPA degradation in alkaline environment.
Zhongting Rao, Nengwu Zhu, Xiaorong Wei, Fei Li, Pingxiao Wu, Zhi Dang, Bofan Cui
2094 related Products with: Efficient peroxydisulfate activation with nZVI/[email protected] nanocomposite derived from wastes for degradation of tetrabromobisphenol A in alkaline environment.100ul100ug1 Set100Î¼g100ul25 Bags/Unit
#33984776 2021/05/03 To Up
Effects of sulfur-rich biochar amendment on microbial methylation of mercury in rhizosphere paddy soil and methylmercury accumulation in rice.Biochar amendment has the potential to reduce methylmercury (MeHg) uptake by rice grains in soil-rice ecosystem. Considering that sulfur can strongly bind Hg and thus reduce its bioavailability, S-modified biochar has been used to immobilize Hg in soils. However, whether natural S-enriched biochar can further reduce Hg and MeHg phytoavailability remains unknown. Moreover, the rhizosphere is one of the most important microbial hotspots regulating the pollutant dynamics in terrestrial ecosystems. Therefore, it is of greater practical significance to examine the impact of biochar amendment on MeHg production and phytoavailability in the rhizosphere versus nonrhizosphere. Here, by conducting a pot experiment, we evaluated the efficacy of biochar derived from sulfur-enriched oilseed rape straw to reduce MeHg accumulation in rice. The results demonstrated that: (1) biochar-induced enhancement of chloride ion and sulfate levels in the overlying water and pore water facilitate microbial methylation of Hg and thus MeHg production in rhizosphere soil. (2) biochar amendment increased rhizosphere soil sulfur content and humic acid-like substances, strengthening MeHg binding to soil, and thus reducing grain MeHg levels by 47%-75%. Our results highlight the necessity to applying natural sulfur-rich biochar accompanied with exogenous sulfur to further reduce MeHg phytoavailability.
Hualing Hu, Beidou Xi, Wenbing Tan
1243 related Products with: Effects of sulfur-rich biochar amendment on microbial methylation of mercury in rhizosphere paddy soil and methylmercury accumulation in rice.300 units5 mg100ug100ug25 mg100ug100 ug100 Î¼g100 Î¼g20 ul (10 mM)
#33984698 2021/04/30 To Up
Photosensitized formation of sulfate and volatile sulfur gases from dissolved organic sulfur: Roles of pH, dissolved oxygen, and salinity.The photodegradation of dissolved organic sulfur (DOS) is a potential source of aqueous sulfate and its chemical precursors in surface water. However, the photochemical fate of DOS and factors that control its fate still remain unclear. Herein, we employed a DOS model featuring a photosensitizer (humic acids, HA) to investigate the photochemical degradation pathways of DOS in various natural water sources, from which we observed the substantial photosensitized formation of sulfate, methanesulfonic acid (MSA), carbonyl sulfide (COS), and carbon disulfide (CS). However, the photochemical production of sulfate and MSA tends to be more efficient than COS and CS. The formation of sulfur-containing photodegradation products was also strongly affected by the identity of the organic sulfur precursor, the oxygen concentration, and the pH, while the salinity did not significantly influence the production ratios. Our results revealed that the photosensitization of DOS contributed significantly to the overall production of sulfate and MSA production, especially in acidic and oxygen-enriched environments, which was attributed to the photochemical production of reactive intermediates, such as excited CDOM (CDOM*) and reactive oxygen species (ROS). Considering the coexistence of DOS and photosensitizers in aquatic environments, photochemistry may play an essential role in the fate of aquatic DOS.
Jian-Long Li, Xing Zhai, Lin Du
1218 related Products with: Photosensitized formation of sulfate and volatile sulfur gases from dissolved organic sulfur: Roles of pH, dissolved oxygen, and salinity.10 mg1000 tests100ug500 mg25 mg 100ul10 mg100ul0.1 mg1000 25 mg 5 G
#33984643 2021/05/10 To Up
Effect of the gradual increase of NaSO on performance and microbial diversity of aerobic granular sludge.Aerobic granular sludge (AGS) is a promising technology in treating saline wastewater. The effects of sodium sulfate on contaminant removal performance and sludge characteristics of AGS were studied. The results showed that under the stress of sodium sulfate, AGS kept good removal performance of ammonia nitrogen (NH+ 4-N), chemical oxygen demand (COD), and total nitrogen (TN), with removal efficiency reaching 98.7%, 91.5% and 62.7%, respectively. When sodium sulfate reached 14700Â mg/L, nitrite oxidizing bacteria (NOB) were inhibited and nitrite accumulation occurred, but it had little impact on total phosphorus (TP) removal. Under the stress of sodium sulfate, compactness and settling performance of AGS was enhanced. The microbial community greatly varied and the microbial diversity of aerobic granular sludge has decreased under the stress of sodium sulfate. The study reveals that AGS has great potential in application on treating saline wastewater.
Xianbin Shi, Ji Li, Xiaochun Wang, Xiaolei Zhang, Liaofan Tang
2695 related Products with: Effect of the gradual increase of NaSO on performance and microbial diversity of aerobic granular sludge.5 G100.00 ug100 mg100 mg100ug1 ml200ul1 6 ml Ready-to-use 10 mg500 Units
#33984641 2021/05/10 To Up
Impact of organic acids and sulfate on the biogeochemical properties of soil from urban subsurface environments.Urban subsurface environments are often different from undisturbed subsurface environments due to the impacts of human activities. For example, deterioration of underground infrastructure can introduce elevated levels of Ca, Fe, and heavy metals into subsurface soils and groundwater. Likewise, leakage from sewer systems can lead to contamination by organic C, N, S, and P. However, the impact of these organic and inorganic compounds on biogeochemical processes including microbial redox reactions, mineral transformations, and microbial community transitions in urban subsurface environments is poorly understood. Here we conducted a microcosm experiment with soil samples from an urban construction site to investigate the possible biotic and abiotic processes impacted when sulfate and acetate or lactate were introduced into an urban subsurface environment. In the top-layer soil (0-0.3Â m) microcosms, which were highly alkaline (pHÂ >Â 10), the major impact was on abiotic processes such as secondary mineral precipitation. In the mid-layer (2-3Â m) soil microcosms, the rate of Fe(III)-reduction and the amount of Fe(II) produced were greatly impacted by the specific organic acid added, and sulfate-reduction was not observed until after Fe(III)-reduction was complete. Near the end of the incubation, some genera related to syntrophic acetate oxidation and methanogenesis were observed in the lactate-amended microcosms. In the bottom-layer (7-8Â m) soil microcosms, the rate of Fe(III)-reduction and the amount of Fe(II) produced were affected by the concentration of amended sulfate. Sulfate-reduction was concurrent with Fe(III)-reduction, suggesting that Fe(II) production was likely due to abiotic reduction of Fe(III) by sulfide produced by microbial sulfate reduction. The slightly acidic initial pH (~5.8) of the mid-soil system was a major factor controlling sequential microbial Fe(III) and sulfate reduction versus parallel Fe(III) and sulfate reduction in the bottom soil system, which had a neutral initial pH (~7.2). 16S rRNA gene-based community analysis revealed a variety of indigenous microbial groups including alkaliphiles, dissimilatory iron and sulfate reducers, syntrophes, and methanogens tightly coupled with, and impacted by, these complex abiotic and biogeochemical processes occurring in urban subsurface environments.
Sunhui Lee, Edward J O'Loughlin, Man Jae Kwon
2769 related Products with: Impact of organic acids and sulfate on the biogeochemical properties of soil from urban subsurface environments.5 G500 Units100 mg100.00 ug50 ug1 kg100 ml100ug50 ug 100 g
#33984430 2021/05/10 To Up
CSPGs Promote the Migration of Meningeal Fibroblasts via p38 Mitogen-activated Protein Kinase Signaling Pathway Under OGD Conditions.Usually glial scar that occurs after central nervous system injury has significantly affected the local neural microenvironment. Meningeal fibroblasts play an essential role in the formation of the glial scar. However, how and why meningeal fibroblasts migrate to lesion sites is still unclear.
Siyi Li, Qingrui Duan, Minyi Lu, Xinrui Wen, Jian Chen, Sheng Tan, Yang Guo
1018 related Products with: CSPGs Promote the Migration of Meningeal Fibroblasts via p38 Mitogen-activated Protein Kinase Signaling Pathway Under OGD Conditions.7 inhibitors100ug200ul100ug100Î¼g100ug5100 Î¼g11 inhibitors100ug/vial50 KU
#33984382 2021/05/10 To Up
Prolonged release and shelf-life of anticoagulant sulfated polysaccharides encapsulated with ZIF-8.Natural active polysaccharides are attracting increased attention from pharmaceutical industries for their valuable biological activities. However, the application of polysaccharides has been restricted due to their relatively large molecular weight, complex structure, and instability. Metal-organic frameworks (MOFs) have emerged to help deliver cargo to specific locations, achieving the objectives of eliminating the potential damage to the body, protecting the drugs, and improving therapeutic effectiveness. Here, a pH-responsive zeolitic imidazolate framework (ZIF-8) was synthesized to encapsulated three sulfated polysaccharides (heparin, fucan sulfate, fucosylated chondroitin sulfate) and a non-sulfated polysaccharide, hyaluronic acid. The resulting [email protected] biocomposites showed differences in terms of morphology, particle size, encapsulation, and release efficiency. These biocomposites retained antithrombotic activity and the framework ZIF-8 effectively protected these polysaccharides from degradation and prolonged shelf-life of the anticoagulants from the unfavorable environment.
Jie Zheng, Bingzhi Li, Yuan Ji, Yin Chen, Xun Lv, Xing Zhang, Robert J Linhardt
2099 related Products with: Prolonged release and shelf-life of anticoagulant sulfated polysaccharides encapsulated with ZIF-8.100tests100tests250tests100tests100tests100ug5/100 Packing /sleeve/bo500 MG100 rxns 25 mg1000 TESTS/0.65ml10 mg
#33984358 2021/05/10 To Up
Effect of MicroRNA145 on the multidrug resistance gene of ulcerative colitis in rats.Multidrug resistance gene (MDR1a) and P-glycoprotein (P-gp) play an important role in the development of ulcerative colitis (UC) and influence the therapeutic effect of glucocorticoids, which may lead to drug resistance mechanically. UC may be related to miR-145 to some extent, and the relationship still needs further exploration. In this study we found that the expression of miR-145 was downregulated in the colonic tissues of rats with Dextran sodium sulfate (DSS)-induced UC. Also, the expression of MDR1a in colon tissues of each group negatively correlated with the expression of miR-145 in rats. The change in the plasma peak concentration (C) in each group positively related to the miR-145 level. Mechanistically, miR-145 negatively regulated the expression and function of P-gp via acting directly on the 3'-UTR of MDR1 mRNA. Overall, these results indicated that miR-145 had a protective effect on the colorectal mucosa, and its downregulation may enhance the expression and function of MDR1a and P-gp, promoting the occurrence and development of UC. The downregulation of miR-145 reduced the drug sensitivity of 5-aminosalicylic acid (5-ASA) and glucocorticoids in treating UC, indicating that miR-145 might be a potential therapeutic target for UC.
Ping Wangs, Yan Chen, La-Mei Zhang, Si-Qi Yuan, Shen-Ao Lu, Ying-Jian Zhang
2293 related Products with: Effect of MicroRNA145 on the multidrug resistance gene of ulcerative colitis in rats.100ug 5 G96T96T1
#33983963 2021/05/13 To Up
Deterioration of modern concrete structures and asphalt pavements by respiratory action and trace quantities of organic matter.In concrete structures (concrete), damage from cracks, deterioration, amorphization, and delamination occur in some structures, causing disaggregation (concrete changed to very fine particles) and hollowing out of the concrete. In concrete pavements, damage from large amounts of pop-out of aggregate occurs from the surface of the concrete pavement 4-5 hours after spraying of snow melting agent on the surface of the pavement. The damage from disaggregation, blistering, cracks, and peeling-off of a surface course have also been observed in asphalt runways and highways. The damage from disaggregation, cracks and pop-out of aggregate in asphalt pavements and concrete structures have long been seen as strange and unexpected and have defied explanation. As a result of examinations in various experiments, it was concluded that all of the unexplained kinds of damage of both asphalt pavements and concrete structures were caused by Trace Quantities of Organic Matter (TQOM), Air Entrained (AE) water reducing agent in air and/or cement, and surfactant in snow melting agent. The emission sources of TQOM and these organic substances were also identified by chemical analysis for these unexpected and unexplained phenomena. The TQOM includes phthalate compounds (phthalates in the following), amine compounds, phosphate compounds, snow melting agent and Sodium Polyoxyethylene Nonyl phenyl Ether Sulfate (SPNES). SPNES is a surfactant in windshield washer fluid for automobiles. We found that the water content and content of organic matter in damaged asphalt pavements and concrete structures are also important indicators for the damage. Further, a new evaluation method for amorphization was proposed in this study and it appears suitable for evaluating the safety of concrete structures along roads which were exposed to TQOM in severely air-polluted environments.
Akihiro Moriyoshi, Eiji Shibata, Masahito Natsuhara, Kiyoshi Sakai, Takashi Kondo, Akihiko Kasahara
2000 related Products with: Deterioration of modern concrete structures and asphalt pavements by respiratory action and trace quantities of organic matter.1 g2.5 mg96 wells (1 kit)100ug10 mg50 ug 100 mg100ug200ul100 mg 25 MG100ul
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