Zobrazení zdroje stránky Raybertram9772

Collectively, these results demonstrate that some gut microorganisms of lepidopterans can benefit the host, but the dietary context is key towards understanding the direction of the response and magnitude of the effect. We provide evidence that gut microorganisms may play a wider role in mediating feeding breadth in lepidopteran pests, but overall impacts could be related to the environmental stress and the metabolic potentials of the microorganisms inhabiting the gut.Developing high-efficiency catalysts for peroxymonosulfate (PMS)-based advanced oxidation processes is important for eliminating pollutants in water. Herein, α-MnO2 with major exposed 110 and 100 facets prepared via a hydrothermal method were used as catalysts to activate PMS for the degradation of Orange Ⅰ (OⅠ). α-MnO2-100, with more abundant surface hydroxyl groups and greater reductive ability, performed remarkably better than α-MnO2-110 for degrading OⅠ. OⅠ removal of 86.20% was obtained in the α-MnO2-100/PMS system. The apparent rate constant of OⅠ removal over α-MnO2-100 was 2.11 times higher than that of α-MnO2-110. The effects of PMS concentration, catalyst dosage, OⅠ concentration, initial pH, anions and humic acid (HA) on OⅠ degradation in the α-MnO2-100/PMS system were systematically investigated. Quenching experiments and electron paramagnetic resonance (EPR) demonstrated that SO4•-, •OH, O2•- and 1O2 were the reactive oxygen species (ROS) in the α-MnO2-100/PMS system. Moreover, the possible degradation pathway of OⅠ in the α-MnO2-100/PMS system was proposed. This work provides an ideal metal oxide catalyst for sewage remediation.The high-throughput production of the eco-friendly MIL-88A(Fe) was achieved under mild reaction conditions with normal pressure and temperature. The as-prepared MIL-88A(Fe) exhibited efficient photo-Fenton catalytic ofloxacin (OFL) degradation upon visible light irradiation with good stability and reusability. The OFL (20.0 mg/L) was completely degraded within 50 min under visible light with the aid of MIL-88A(Fe) (0.25 g/L) and H2O2 (1.0 mL/L) in aqueous solution (pH = 7.0). The hydroxyl radicals (·OH) are the main active species during the photo-Fenton oxidation process. Meanwhile, the degradation intermediates and the corresponding degradation pathways were identified and proposed with the aid of both ultra-high performance liquid chromatography tandem quadrupole time-of-flight mass spectrometry (UHPLC-Q-TOF-MS) and density functional theory (DFT) calculations. Finally, the degradation product library was firstly established to identify intermediate transformation products (TPs) with their variation of concentration, and their corresponding toxicologic activities were assessed via Toxtree and T.E.S.T software as well. Finally, the MIL-88A is efficient and stable with four cycles' catalysis operations, demonstrating good potential for water treatment.The research on transportation of river microplastics (MPs) mainly focuses on the estimations of the total contents of river MPs entering the ocean, while the related transportation processes and influence factors were still largely unknown. In our study, the role of mangrove forest, a special tropical ecosystem in the estuary, on the transportations of MPs from rivers to ocean was explored. [https://www.selleckchem.com/products/fin56.html click here] Except for the ND river with the absence of mangrove forest, the MPs collected from the water sample of the river upstream were much higher than their corresponding downstream (p less then 0.05), with the interception rate of riverine MPs by mangrove forests ranging from 12.86% to 56% in dry season and 10.57%-42% in rainy season. The MPs with the characteristics of high density, larger size and regular shape were more easily intercepted. Furthermore, the combined effects of ecological indicators, the properties of mangrove and the hydrodynamic factors jointly determined the interception rates of MPs. This study provides a new perspective and data support for quantifying mangrove forests intercepting MPs in rivers as a factor of MPs retention in global rivers.The release of residual ammonium (RA) leaching agent from weathered crust elution-deposited rare earth tailings would cause serious environmental pollution, and it was necessary to efficiently remove it from the ore body before the mine closure. In this study, occurrence states of the RA were determined and dynamic elution of RA from rare earth tailings by using magnesium chloride as eluent was investigated. Effects of initial concentration, pH, flow rate, and particle size on the ammonium removal efficiency were investigated, and variations of ammonium occurrence states before and after elution were determined. Lastly, elution mechanism was discussed. Results showed that removal efficiency of RA by magnesium chloride was significantly higher than that by deionized water, and elution efficiency of RA could reach about 95.7% at the optimum laboratory experiment conditions. Energy dispersive spectrometer (EDS) analysis illustrated that the residual ammonium was replaced by Mg2+ during the elution process, and occurrence state experimental results showed that 94.0% of water-soluble and adsorbable ammonium was eluted. The empirical kinetic equation of eluting RA by magnesium chloride was established as 1-2/3α-(1-α)2/3= 0.02*C00.6t. This study provided a valuable method for reducing environmental pollution caused by the release of the residual ammonium from the rare earth tailings.The design of high-performance electrode materials with excellent desalination ability has always been a research goal for efficient capacitive deionization (CDI). Herein, a hybrid architecture with Cu/Cu2O nanospheres anchored on porous carbon nanosheets (Cu/Cu2O/C) was first synthesized by pyrolyzing a two-dimensional (2D) Cu-based metal-organic framework and then evaluated as a cathode for hybrid CDI. The as-prepared Cu/Cu2O/C exhibits a hierarchically porous structure with a high specific surface area of 305 m2 g-1 and large pore volume of 0.55 cm3 g-1, which is favorable to accelerating ion migration and diffusion. The porous carbon nanosheet matrix with enhanced conductivity will facilitate the Faradaic reactions of Cu/Cu2O nanospheres during the desalination process. The Cu/Cu2O/C hybrid architecture displays a high specific capacitance of 142.5 F g-1 at a scan rate of 2 mV s-1 in 1 M NaCl solution. The hybrid CDI constructed using the Cu/Cu2O/C cathode and a commercial activated carbon anode exhibits a high desalination capacity of 16.4 mg g-1 at an operation voltage of 1.2 V in 500 mg L-1 NaCl solution. Additionally, the hybrid CDI exhibits a good cycling stability with 18.3% decay in the desalination capacity after 20 electrosorption-desorption cycles. Thus, the Cu/Cu2O/C composite is expected to be a promising cathode material for hybrid CDI.Systemic lupus erythematosus (SLE) is an autoimmune disease characterized by the dysregulation of various cell types and immunological pathways. Autoantibodies play an important role in its pathogenesis. The presence of autoantibodies suggests that self-antigen presentation through major histocompatibility complex (MHC) class II on antigen presenting cells is involved in the pathogenesis of autoimmune diseases, including SLE. Cathepsin S (CatS) is a key protease for antigen peptide loading onto lysosomal/endosomal MHC class II molecules through invariant chain degradation to promote antigen presentation. Inhibition of CatS is therefore expected to suppress antigen presentation via MHC class II, T and B cell activation, and antibody production from B cells. Here, we report the pharmacological profile of ASP1617, a novel CatS inhibitor. ASP1617 induced invariant chain accumulation and decreased the expression level of MHC class ΙΙ on the cell surface in both mouse and human B cells. Further, ASP1617 prevented DO11.10 mice T cell proliferation to ovalbumin antigen. We investigated the effects of ASP1617 and mycophenolate mofetil (MMF) on the development of lupus-like nephritis in NZB/W F1 mice, a widely used SLE mouse model. Oral administration of ASP1617 suppressed anti-dsDNA IgG, prevented progression of lupus-like glomerulonephritis, and significantly prevented proteinuria excretion. In contrast, MMF did not suppress anti-dsDNA IgG. Further, we found that plasma and/or urine CatS levels were increased in specimens from NZB/W F1 mice and several SLE patients. These results indicate that CatS may be an attractive therapeutic target for the treatment of SLE.Sulforaphane (SFN), the main ingredient in broccoli/broccoli sprouts, has a good anticancer effect in a wide variety of tumors, but whether SFN affects acute leukemia is not elucidated. Due to the self-renewal capability for leukemia stem cells, acute leukemia has a high relapse rate. This study explored the effects and related molecular mechanisms of SFN on the proliferation of leukemia stem-like cells in acute myeloid leukemia cells. We found that SFN inhibited the proliferation of leukemia stem-like cells in vitro and in vivo. Meanwhile, we observed that SFN could regulate the stem characteristic of leukemia cells. After SFN treatment, the expression of the key players in the Sonic Hedgehog (Shh) signaling pathway was significantly decreased at the transcriptional and protein levels. To further determine the contribution of the Shh signaling molecular mechanism to SFN-mediated self-renewal capability of LSCs, we then manipulated the Shh gene in the leukemia cells to either overexpress the gene using lentiviral vector transduction or knockdown the gene via siRNA. The results demonstrated that SFN suppressed proliferation in Shh-overexpressed cells more than in Shh-downregulated cells, suggesting that SFN negatively modulates proliferation of leukemia stem-like cells via affecting the Shh signaling pathway. Altogether, these results suggest that SFN is a potent anti-leukemia agent that has inhibitory effects on leukemia stem-like cells' proliferation by regulating the Shh signaling pathway.Gastric cancer (GC) is a serious affliction worldwide and remains to be the fourth most common cancer with poor prognosis, especially in advanced stage. Chemotherapy is one of the main therapeutic means. The purpose of this study was to investigate the antitumor effects of Schisandrin B (Sch B) on GC cells both in vitro and in vivo, as well as the synergistic effect with 5-fluorouracil (5-FU), and to preliminarily explore the relevant mechanism of action. Our results showed that Sch B inhibited the growth, migration and invasion of GC cells. Besides, Sch B could effectively inhibit the phosphorylation of STAT3 (signal transducer and activator of transcription 3), induce autophagy, and enhance the efficacy of chemotherapy drug 5-FU in vitro and in vivo. Taken together, the findings indicate that Sch B displays potent antitumor activities. The co-administration of Sch B and 5-FU might be a promising way for future therapy of GC.<br /><br /> The anti-apoptotic effects of diosgenin, a steroid saponin, on hearts in female with estrogen deficiency have been less studied. This study aimed to evaluate the anti-apoptotic effects of diosgenin on cardiac widely dispersed apoptosis in a bilateral ovariectomized animal model.<br /><br /> A total of 60 female Wistar rats, aged 6-7months, were divided into the sham-operated group (Sham), bilateral ovariectomized rats for 2months, and ovariectomized rats administered with 0, 10, 50, or 100mg/kg diosgenin daily (OVX, OVX 10, OVX 50, and OVX 100, respectively) in the second month. The excised hearts were analyzed by H&amp;E staining, TUNEL(+) assays and Western Blot.<br /><br /> Cardiac TUNEL(+) apoptotic cells, the levels of Fas ligand, Fas death receptors, Fas-associated death domain, active caspase-8, and active caspase-3 (FasL/Fas-mediated pathways) as well as the levels of Bax, Bad, Bax/Bcl2, Bad/p-Bad, cytosolic Cytochrome c, active caspase-9, and active caspase-3 (mitochondria-initiated pathway) were increased in OVX compared with Sham group but those were decreased in OVX 50 compared with OVX.