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https://www.readbyqxmd.com/read/28432969/quantitative-effects-of-amination-degree-on-the-magnetic-iron-oxide-nanoparticles-mionps-using-as-adsorbents-to-remove-aqueous-heavy-metal-ions
#1
Sen Lin, Meng Xu, Wei Zhang, Xiufu Hua, Kuangfei Lin
The hierarchical effect of amine-functionalization on nanoparticle properties, magnetism especially, and adsorption of Cu(2+), Ni(2+), Pb(2+) and Zn(2+) by aminated MIONPs were investigated elaboratively. The results reflected that the dispersibility and stability of nanoparticles in aqueous solution were both enhanced as MIONPs grafted with amine groups, while saturation magnetism and magnetic recovery conveniences had a negatively correlative relation with the amination degree. In addition, the adsorption performances of Cu(2+), Ni(2+), Pb(2+) and Zn(2+) by different aminated MIONPs were also studied comprehensively...
January 16, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28432957/nanoencapsulation-strategies-for-the-delivery-of-novel-bifunctional-antioxidant-%C3%AF-1-selective-ligands
#2
Claudia Carbone, Emanuela Arena, Veronica Pepe, Orazio Prezzavento, Ivana Cacciatore, Hasan Turkez, Agostino Marrazzo, Antonio Di Stefano, Giovanni Puglisi
Nowadays sigma-1 receptors are considered as new therapeutic objectives for central nervous system neurodegenerative diseases. Among different molecules, alpha lipoic acid has been identified as a natural potent antioxidant drug, whose therapeutic efficacy is limited by its many drawbacks, such as fast metabolism, poor bioavailability and high physico-chemical instability. Alfa-lipoic acid derivatives have been recently developed demonstrating their neuroprotective activity and effectiveness in different types of oxidative stress...
April 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28432625/synthesis-of-magnetic-cofe2o4-ordered-mesoporous-carbon-nanocomposites-and-application-in-fenton-like-oxidation-of-rhodamine-b
#3
Jing Deng, Yi-Jing Chen, Yu-An Lu, Xiao-Yan Ma, Shan-Fang Feng, Naiyun Gao, Jun Li
CoFe2O4/ordered mesoporous carbon (OMC) nanocomposites were synthesized and tested as heterogeneous peroxymonosulfate (PMS) activator for the removal of rhodamine B. Characterization confirmed that CoFe2O4 nanoparticles were tightly bonded to OMC, and the hybrid catalyst possessed high surface area, pore volume, and superparamagnetism. Oxidation experiments demonstrated that CoFe2O4/OMC nanocomposites displayed favorable catalytic activity in PMS solution and rhodamine B degradation could be well described by pseudo-first-order kinetic model...
April 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28431352/degradation-of-sulfamethoxazole-by-uv-uv-h2o2-and-uv-persulfate-pds-formation-of-oxidation-products-and-effect-of-bicarbonate
#4
Yi Yang, Xinglin Lu, Jin Jiang, Jun Ma, Guanqi Liu, Ying Cao, Weili Liu, Juan Li, Suyan Pang, Xiujuan Kong, Congwei Luo
The frequent detection of sulfamethoxazole (SMX) in wastewater and surface waters gives rise of concerns about their ecotoxicological effects and potential risks to induce antibacterial resistant genes. UV/hydrogen peroxide (UV/H2O2) and UV/persulfate (UV/PDS) advanced oxidation processes have been demonstrated to be effective for the elimination of SMX, but there is still a need for a deeper understanding of product formations. In this study, we identified and compared the transformation products of SMX in UV, UV/H2O2 and UV/PDS processes...
March 28, 2017: Water Research
https://www.readbyqxmd.com/read/28431327/dendrimer-conjugated-iron-oxide-nanoparticles-as-stimuli-responsive-drug-carriers-for-thermally-activated-chemotherapy-of-cancer
#5
Saumya Nigam, Dhirendra Bahadur
In recent years, functional nanomaterials have found an appreciable place in the understanding and treatment of cancer. This work demonstrates the fabrication and characterization of a new class of cationic, biocompatible, peptide dendrimers, which were then used for stabilizing and functionalizing magnetite nanoparticles for combinatorial therapy of cancer. The synthesized peptide dendrimers have an edge over the widely used PAMAM dendrimers due to better biocompatibility and negligible cytotoxicity of their degradation products...
April 13, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28431217/reduced-graphene-oxide-as-an-effective-adsorbent-for-removal-of-malachite-green-dye-plausible-adsorption-pathways
#6
Kanika Gupta, Om P Khatri
Efficient removal of malachite green (MG) dye from simulated wastewater is demonstrated using high surface area reduced graphene oxide (rGO). The plausible interaction pathways between MG dye and rGO are deduced from nanostructural features (HRTEM) of rGO and spectroscopic analyses (FTIR and Raman). The high surface area (931m(2)⋅gm(-1)) of rGO, π-π interaction between the aromatic rings of MG dye and graphitic skeleton, and electrostatic interaction of cationic centre of MG dye with π-electron clouds and negatively charged residual oxygen functionalities of rGO collectively facilitate the adsorption of MG dye on the rGO...
April 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28431216/synthesis-and-loading-dependent-characteristics-of-nitrogen-doped-graphene-foam-carbon-nanotube-manganese-oxide-ternary-composite-electrodes-for-high-performance-supercapacitors
#7
Tao Cheng, Baozhi Yu, Linli Cao, Huiyun Tan, Xinghua Li, Xinliang Zheng, Weilong Li, Zhaoyu Ren, Jinbo Bai
The ternary composite electrodes, nitrogen-doped graphene foam/carbon nanotube/manganese dioxide (NGF/CNT/MnO2), have been successfully fabricated via chemical vapor deposition (CVD) and facile hydrothermal method. The morphologies of the MnO2 nanoflakes presented the loading-dependent characteristics and the nanoflake thickness could also be tuned by MnO2 mass loading in the fabrication process. The correlation between their morphology and electrochemical performance was systematically investigated by controlling MnO2 mass loading in the ternary composite electrodes...
April 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28430291/status-of-the-brain-antioxidant-system-at-different-growing-periods-after-prenatal-stress-and-n-acetyl-cysteine-administration
#8
Liegelin Kavitha Bernhardt, Sampath Madhyastha, Lakshminarayana Bairy, Anoop Kishore
<i>Prenatal stress-induced neurobehavioral deficits observed in offspring are multifactorial, including oxidative stress in the developing brain. The time by which the developing brain acquires self-defense against oxidative stress is not clear. Hence in the present study we aimed to evaluate the brain antioxidant status during different developing periods. Further the study also evaluates the role of the glutathione precursor, N-acetyl cysteine (NAC) on the brain antioxidant status. Pregnant rats were subjected to restraint stress during an early or late gestational period...
2017: Folia Neuropathologica
https://www.readbyqxmd.com/read/28429929/flexible-paper-like-free-standing-electrodes-by-anchoring-ultrafine-sns2-nanocrystals-on-graphene-nanoribbons-for-high-performance-sodium-ion-batteries
#9
Yang Liu, Yongzhen Yang, Xuzhen Wang, Yanfeng Dong, Yongchao Tang, Zhengfa Yu, Zongbin Zhao, Jieshan Qiu
Ultrafine SnS2 nanocrystals/reduced graphene oxide nanoribbon paper (SnS2/RGONRP) has been created by a well-designed process including in situ reduction, evaporation induced self-assembly and sulfuration. The as formed SnS2 nanocrystals possess an average diameter of 2.3 nm and disperse on the surface of RGONRs uniformly. The strong capillary force formed during evaporation leads to a compact assembly of RGONRs to give flexible paper structure with high density of 0.94 g cm-3. The as-prepared SnS2/RGONRP composite could be directly used as free-standing electrode for sodium ion batteries...
April 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28429506/a-robust-and-conductive-black-tin-oxide-nanostructure-makes-efficient-lithium-ion-batteries-possible
#10
Wujie Dong, Jijian Xu, Chao Wang, Yue Lu, Xiangye Liu, Xin Wang, Xiaotao Yuan, Zhe Wang, Tianquan Lin, Manling Sui, I-Wei Chen, Fuqiang Huang
SnO2 -based lithium-ion batteries have low cost and high energy density, but their capacity fades rapidly during lithiation/delithiation due to phase aggregation and cracking. These problems can be mitigated by using highly conducting black SnO2-x , which homogenizes the redox reactions and stabilizes fine, fracture-resistant Sn precipitates in the Li2 O matrix. Such fine Sn precipitates and their ample contact with Li2 O proliferate the reversible Sn → Li x Sn → Sn → SnO2 /SnO2-x cycle during charging/discharging...
April 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28429114/physical-and-chemical-characteristics-of-the-longissimus-dorsi-from-swine-reared-in-climate-controlled-and-uncontrolled-environments
#11
Juliana Lolli Malagoli de Mello, Mariana Piatto Berton, Rita de Cassia Dourado, Aline Giampietro-Ganeco, Rodrigo Alves de Souza, Fábio Borba Ferrari, Pedro Alves de Souza, Hirasilva Borba
The aim of this study was to evaluate the effect of ambient temperature on the physical and chemical characteristics of the longissimus dorsi muscle by comparing the quality of meat from pigs reared in a controlled and in an uncontrolled environment, the latter provided with a shallow pool. Twenty castrated male pigs of the Topigs line were randomly allotted to two treatments: a controlled environment, with constant temperature (22 °C) and relative humidity (70%); and an uncontrolled environment in a conventional shed for rearing pigs equipped with a shallow pool, where pigs were subject to climatic variations...
April 20, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/28428990/nanoscale-adhesion-and-sliding-on-biased-semiconductors
#12
A Mukherjee, A D Craciun, J L Gallani, M V Rastei
We present experimental and theoretical results on controlling nanoscale sliding friction and adhesion by electric fields on model contacts realized by bringing a conductive atomic force microscope tip into contact with the surface of a silicon-oxide/silicon wafer. We find that applying a bias voltage on silicon (or on the conductive tip) enables a noticeable control of the sliding forces. Two electrostatic interactions are identified as being relevant for the friction variation as a function of applied voltage...
April 21, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28428070/no-production-and-potassium-channels-activation-induced-by-crotalus-durissus-cascavella-underlie-mesenteric-artery-relaxation
#13
S S Santos, R L C Jesus, L O Simões, W P Vasconcelos, I A Medeiros, R C Veras, L L Casais-E-Silva, D F Silva
Animal toxins are natural resources for pharmacological studies. The venom of Crotalus durissus cascavella (C.d. cascavella) may be a source in the bio-prospecting of new anti-hypertensive agents. The aim of this study was to investigate vascular effects of the venom of C.d. cascavella in normotensive rats. Studies were performed using isolated mesenteric artery segments and aortic endothelial cells. The cumulative administration of the venom of C.d. cascavella (0.001-30 μg/mL) on phenylephrine (Phe; 10 μM) pre-contracted rings induced a concentration-dependent vasorelaxation in the presence of vascular endothelium (Emax = 47...
April 17, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28428000/selected-oxidative-stress-biomarkers-in-antenatal-diagnosis-as-11-14-gestational-weeks
#14
Marek Pietryga, Piotr Dydowicz, Kinga Toboła, Marta Napierała, Izabela Miechowicz, Anna Gąsiorowska, Maciej Brązert, Ewa Florek
The primary objective in modern obstetrics and prenatal diagnosis is to predict risks of congenital abnormalities. The aim of the research was to assess the correlation between selected oxidative stress biomarkers with the risk of foetal chromosomal aberration evaluated at the first trimester screening. A series of studies show that balanced free radical activity and oxidative homeostasis are essential for proper bodily growth and function. Reactive oxygen species (ROS) may be one of the factors associated with disruption of cell cycle and tissue development, thus leading to developmental abnormalities...
April 17, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28426747/metabolic-analysis-of-radioresistant-medulloblastoma-stem-like-clones-and-potential-therapeutic-targets
#15
Lue Sun, Takashi Moritake, Kazuya Ito, Yoshitaka Matsumoto, Hironobu Yasui, Hidehiko Nakagawa, Aki Hirayama, Osamu Inanami, Koji Tsuboi
Medulloblastoma is a fatal brain tumor in children, primarily due to the presence of treatment-resistant medulloblastoma stem cells. The energy metabolic pathway is a potential target of cancer therapy because it is often different between cancer cells and normal cells. However, the metabolic properties of medulloblastoma stem cells, and whether specific metabolic pathways are essential for sustaining their stem cell-like phenotype and radioresistance, remain unclear. We have established radioresistant medulloblastoma stem-like clones (rMSLCs) by irradiation of the human medulloblastoma cell line ONS-76...
2017: PloS One
https://www.readbyqxmd.com/read/28426681/preventing-treating-and-predicting-barbering-a-fundamental-role-for-biomarkers-of-oxidative-stress-in-a-mouse-model-of-trichotillomania
#16
Giovana de L T Vieira, Amy C Lossie, Donald C Lay, John S Radcliffe, Joseph P Garner
Barbering, where a "barber" mouse plucks hair from its cagemates or itself, is both a spontaneously occurring abnormal behavior in mice and a well validated model of Trichotillomania (TTM). N-Acetylcysteine, (NAC) a cysteine derived food additive, is remarkably effective in treating TTM patients, but its mechanism of action is unknown. Reactive Oxygen Species (ROS), also known as free radicals, form as a natural byproduct of the normal metabolism of oxygen. Under normal circumstances, cells are able to defend themselves against ROS damage with antioxidant pathways...
2017: PloS One
https://www.readbyqxmd.com/read/28425696/granadilla-inspired-structure-design-for-conversion-alloy-reaction-electrode-with-integrated-lithium-storage-behaviors
#17
Chaoji Chen, Linfeng Peng, Yiju Li, Lei Zhang, Jingwei Xiang, Pei Hu, Shijie Cheng, Yunhui Huang, Jia Xie
Conversion/alloy-reaction electrode materials promise much higher energy density than the commonly used ones based on intercalation chemistries. However, the low electronic conductivity, and specially the large volume expansion upon lithiation hinder their practical applications. Here for the first time, a unique granadilla-inspired structure was designed to prepare the conversion/alloy-reaction anode of carbon coated tin/calcium tin oxide (C@void@Sn/CaSnO3) ternary composite. The granadilla-inspired structure ensures the intimate contact between the Sn/CaSnO3 nanoparticles and the carbon matrix, providing not only conductive networks for electron transport and short distance for Li+ diffusion but also effective space for the electrode volume-expansion towards conversion/alloy reaction...
April 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28425269/evaluation-of-cytotoxic-membrane-and-dna-damaging-effects-of-thymus-revolutus-c%C3%A3-lak-essential-oil-on-different-cancer-cells
#18
Aysun Özkan, Ayşe Erdoğan
BACKGROUND/AIM: In this study, we evaluated Thymus revolutus Célak essential oil and its two main constituents, γ-terpinene and p-cymene, as potential oxidative agents against lung cancer and epidermoid carcinoma cells. MATERIALS AND METHODS: Cell viability assessment was made by CellTiter-Blue1397904493 cell viability and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay after treatment with 5-600 μg/mL concentrations of essential oil, γ-terpinene, and p-cymene...
April 18, 2017: Turkish Journal of Medical Sciences
https://www.readbyqxmd.com/read/28424548/decreased-levels-of-irisin-a-skeletal-muscle-cell-derived-myokine-are-related-to-emphysema-associated-with-chronic-obstructive-pulmonary-disease
#19
Yukari Sugiyama, Kazuhisa Asai, Kazuhiro Yamada, Yuko Kureya, Naoki Ijiri, Tetsuya Watanabe, Hiroshi Kanazawa, Kazuto Hirata
BACKGROUND: Cigarette smoking-induced oxidant-antioxidant imbalance is a factor that contributes to the pathogenesis of COPD through epithelial cell apoptosis. Irisin is a skeletal muscle cell-derived myokine associated with physical activity. Irisin is also known to decrease oxidant-induced apoptosis in patients with diabetes mellitus. However, the correlation between irisin and emphysema in COPD and its role in epithelial cell apoptosis remains unknown. SUBJECTS AND METHODS: Forty patients with COPD were enrolled in this study...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/28424427/nos2-expression-in-glioma-cell-lines-and-glioma-primary-cell-cultures-correlation-with-neurosphere-generation-and-sox-2-expression
#20
Paola Palumbo, Gianfranca Miconi, Benedetta Cinque, Francesca Lombardi, Cristina La Torre, Soheila Raysi Dehcordi, Renato Galzio, Annamaria Cimini, Antonio Giordano, Maria Grazia Cifone
Nitric oxide has been implicated in biology and progression of glioblastoma (GBM) being able to influence the cellular signal depending on the concentration and duration of cell exposure. NOS2 (inducible nitric oxide synthase) have been proposed as a component of molecular profile of several tumors, including glioma, one of the most aggressive primary brain tumor featuring local cancer stem cells responsible for enhanced resistance to therapies and for tumor recurrence. Here, we investigated the NOS2 mRNA expression by reverse transcription-PCR in human glioma primary cultures at several grade of malignancy and glioma stem cell (GSC) derived neurospheres...
March 10, 2017: Oncotarget
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