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https://www.readbyqxmd.com/read/28319703/impacts-of-human-activities-on-nutrient-transport-in-the-yellow-river-the-role-of-the-water-sediment-regulation-scheme
#1
Xinyu Li, Hontao Chen, Xueyan Jiang, Zhigang Yu, Qingzhen Yao
Anthropogenic activities alter the natural states of large rivers and their surrounding environment. The Yellow River is a well-studied case of a large river with heavy human control. An artificial managed water and sediment release system, known as the Water-Sediment Regulation Scheme (WSRS), has been carried out annually in the Yellow River since 2002. Nutrient concentrations and composition display significant time and space variations during the WSRS period. To figure out the anthropogenic impact of nutrient changes and transport in the Yellow River, biogeochemical observations were carried out in both middle reaches and lower reaches of the Yellow River during 2014 WSRS period...
March 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28319374/mechanisms-of-energy-transfer-and-enhanced-stability-of-carbidonitride-phosphors-for-solid-state-lighting
#2
Christopher Grieco, Kurt F Hirsekorn, Andrew T Heitsch, Alan C Thomas, Mark H McAdon, Britt A Vanchura, Michael M Romanelli, Lora L Brehm, Anne Leugers, Anatoliy Sokolov, John B Asbury
Phosphor-converted light emitting diodes (pcLEDs) produce white light through the use of phosphors that convert blue light emitted from the LED chip into green and red wavelengths. Understanding the mechanisms of degradation of the emission spectra and quantum yields of the phosphors used in pcLEDs is of critical importance to fully realize the potential of solid state lighting as an energy efficient technology. Toward this end, time-resolved photoluminescence spectroscopy was used to identify the mechanistic origins of enhanced stability and luminescence efficiency that can be obtained from a series of carbidonitride red phosphors with varying degree of substitutional carbon...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28318304/sequential-role-of-biosorption-and-biodegradation-in-rapid-removal-degradation-and-utilization-of-methyl-parathion-as-a-phosphate-source-by-a-new-cyanobacterial-isolate-scytonema-sp-bhus-5
#3
Balkrishna Tiwari, Savita Singh, Sindhunath Chakraborty, Ekta Verma, Arun Kumar Mishra
A new isolate of genus Scytonema distinct from its closest relative Scytonema hofmanni was found efficient in removal and degradation of organophosphorus pesticide methyl parathion (MP). The cyanobacterial isolate was also capable to utilize the phosphorous present in the methyl parathion following its degradation which was evident from the increase in growth (chlorophyll content), biomass, protein content and total phosphorous in comparison to cyanobacterium grown in phosphate deficient cultures. The rapid removal of MP by the cyanobacterium during initial 6 hours of incubation was defined by the pseudo second order of biosorption kinetics model, which has indicated the involvement of chemosorption in initial removal of pesticide...
March 20, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28318297/impacts-of-vegetation-and-temperature-on-the-treatment-of-domestic-sewage-in-constructed-wetlands-incorporated-with-ferric-carbon-micro-electrolysis-material
#4
Qingwei Zhou, Hui Zhu, Gary Bañuelos, Baixing Yan, Yinxiu Liang, Jing Yu, Huai Li
Ferric-Carbon Micro-Electrolysis (Fe/C-M/E) material had been widely used for the pretreatment of wastewater. Therefore, we hypothesized that Fe/C-M/E material could enhance the treatment of domestic sewage when integrated into CWs. In this study, constructed wetlands (CWs) integrated with Fe/C-M/E material were developed. During the experiment of vegetation influence, percentages of NH4(+)-N, NO3(-)-N, TN, and COD removed in polyculture (W1) were up to 91.8%, 97.0%, 92.3%, and 85.4%, respectively, which were much higher than those in Lythrum salicaria monoculture (W2) and Canna indica monoculture (W3)...
March 20, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28318067/dynamic-phosphorescent-probe-for-facile-and-reversible-stress-sensing
#5
G A Filonenko, J R Khusnutdinova
Dynamic phosphorescent copper complex incorporated into the main chain of polyurethanes produces a facile and reversible response to tensile stress. In contrast to common deformation sensors, the applied stress does not lead to bond scission, or alters the phosphor structure. The suppression of dynamics responsible for the nonradiative relaxation is found to be the major pathway governing stress response. As a result, the response of dynamic phosphor described in this work is stress specific. Compared to initial unloaded state, a nearly twofold increase of photoluminescence intensity occurs in response to a 5-35 MPa stress applied to pristine metalated polymers or their blends with various polyurethanes...
March 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28316197/-inhibitory-effect-of-insulin-like-growth-factor-binding-protein-related-protein-1-on-retinal-angiogenesis-via-erk-signaling-pathway
#6
P Zhang, H Wang, H Cao, X Xu, T Sun
Objective: To explore the inhibitory effect of insulin-like growth factor binding protein-related protein 1 (IGFBP-rP1), a novel anti-angiogenic factor, on retinal angiogenesis and its underlying molecular mechanisms. Methods: Experimental study. C57BL/6J mice were classified into three groups: control group (n=24), oxygen-induced retinopathy (OIR) non-intervention group (n=24) and OIR intervention group (n=72). The OIR mouse model was established using improved Smith's methods (n= 96). Twelve-day-old mice in the OIR intervention group were randomly assigned into three groups receiving intravitreal injection of recombinant mouse IGFBP-rP1 (50 μg/L, 100 μg/L and 200 μg/L, respectively)...
March 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28314962/pd-l1-expression-in-pancreatic-ductal-adenocarcinoma-is-a-poor-prognostic-factor-in-patients-with-high-cd8-tumor-infiltrating-lymphocytes-highly-sensitive-detection-using-phosphor-integrated-dot-staining
#7
So Yamaki, Hiroaki Yanagimoto, Koji Tsuta, Hironori Ryota, Masanori Kon
BACKGROUND: Pancreatic ductal adenocarcinoma (PDAC) has an extremely poor prognosis. For the development of more effective immunotherapies, it is first necessary to elucidate the immunological escape mechanisms. In this study, we applied our recently developed highly sensitive immunostaining method employing fluorescent phosphor-integrated dot (PID) nanoparticles to evaluate the prevalence of programmed death ligand 1 (PD-L1) in patients with PDAC. METHODS: This study included 42 patients with PDAC who underwent pancreatectomy...
March 18, 2017: International Journal of Clinical Oncology
https://www.readbyqxmd.com/read/28314195/treatment-of-contaminated-greywater-using-pelletised-mine-water-sludge
#8
Suhail N Abed, Suhad A Almuktar, Miklas Scholz
Precipitated sludge (ochre) obtained from a mine water treatment plant was considered as an adsorbent substance for pollutants, since ochre is relatively free from problematic levels of toxic elements, which could impair on the quality of water to be treated. Artificially created ochre pellets from mixing Portland cement with raw ochre sludge were utilised to remediate either high (HC) or low (LC) contaminated synthetic greywater (SGW) in mesocosm-scale stabilisation ponds at 2-day and 7-day contact times under real weather conditions in Salford...
March 14, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28304161/syntheses-photoluminescence-and-electroluminescence-of-a-series-of-sublimable-bipolar-cationic-cuprous-complexes-with-thermally-activated-delayed-fluorescence
#9
Fuli Zhang, Yuqiao Guan, Xulin Chen, Shuangshuang Wang, Dong Liang, Yafei Feng, Shufen Chen, Suzhi Li, Zhongyi Li, Fuqiang Zhang, Canzhong Lu, Guangxiu Cao, Bin Zhai
Three thermally activated delayed fluorescence cationic cuprous complexes [Cu(POP) (ECAF)]PF6 (1, POP = bis(2-diphenylphosphinophenyl)ether, ECAF = 9,9-bis(9-ethylcarbazol-3-yl)-4,5-diazafluorene), [Cu(POP) (EHCAF)]PF6 (2, EHCAF = 9,9-bis(9-ethylhexylcarbazol-3-yl)-4,5-diazafluorene), and [Cu(POP) (PCAF)]PF6 (3, PCAF = 9,9-bis(9-phenylcarbazaol-3-yl)-4,5-diazafluorene) with bipolar 4,5-diazafluorene ligand substituted by bis-carbazole have been successfully prepared, and their UV absorption, photoluminescent properties, and electrochemical behaviors were investigated...
March 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28304065/charge-transfer-induced-energy-storage-in-caznos-mn-insight-from-experimental-and-computational-spectroscopy
#10
Jonas J Joos, Kurt Lejaeghere, Katleen Korthout, Ang Feng, Dirk Poelman, Philippe F Smet
CaZnOS:Mn(2+) is a rare-earth-free luminescent compound with an orange broadband emission at 612 nm, featuring pressure sensing capabilities, often explained by defect levels where energy can be stored. Despite recent efforts from experimental and theoretical points of view, the underlying luminescence mechanisms in this phosphor still lack a profound understanding. By the evaluation of thermoluminescence as a function of the charging wavelength, we probe the defect levels allowing energy storage. Multiple trap depths and trapping routes are found, suggesting predominantly local trapping close to Mn(2+) impurities...
March 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28303719/pentanuclear-lanthanide-mono-organophosphates-synthesis-structure-and-magnetism
#11
Sandeep K Gupta, Stuart K Langley, Kamna Sharma, Keith S Murray, Ramaswamy Murugavel
Research on rare-earth phosphates has recently received substantial interest because of their unique physical and chemical properties. In recent years, because of their low solubility, research interest has been built on developing methodologies to prepare nanostructures and grow single crystals of inorganic rare-earth phosphates. The chemistry of rare-earth organophosphates, however, is still at a latent stage. Contrary to the traditional hydrothermal route, we report rare examples of discrete pentanuclear lanthanide(III) organophosphate clusters assembled from a sterically encumbered monoester of phosphoric acid under mild reaction conditions...
March 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28302909/ppn2-a-novel-zn-2-dependent-polyphosphatase-in-the-acidocalcisome-like-yeast-vacuole
#12
Rūta Gerasimaitė, Andreas Mayer
Acidocalcisome-like organelles are found in all kingdoms of life. Many of their functions, such as the accumulation and storage of metal ions, nitrogen and phosphate, the activation of blood clotting and inflammation, depend on the controlled synthesis and turnover of polyphosphate (polyP), a polymer of inorganic phosphate linked by phosphoric anhydride bonds. The exploration of the role of acidocalcisomes in metabolism and physiology requires manipulation of polyP turnover, yet the complete set of proteins responsible for this turnover is unknown...
March 16, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28301880/fast-and-green-co2-based-extraction-isolation-and-quantification-of-phenolic-styrax-constituents
#13
Johanna Scheuba, Valerie-Katharina Wronski, Judith M Rollinger, Ulrike Grienke
In this study the first supercritical fluid based protocol for the extraction, analysis, and isolation of six polar compounds, i.e., o-vanillin (1), styracin (2), vanillin (3), trans-cinnamic acid (4), vanillic acid (5), and shikimic acid (6), was developed. First, eight styrax resin products (R1-R8) obtained from various Liquidambar tree species, which are known to contain compounds 2-6, were extracted with a 1 : 1 mixture of supercritical CO2 and EtOH. Within 4 minutes, the compounds were successfully baseline separated on an Acquity UPC(2) BEH 2-EP (3...
March 16, 2017: Planta Medica
https://www.readbyqxmd.com/read/28301024/comparison-of-cone-beam-computed-tomography-and-intraoral-radiography-in-detection-of-recurrent-caries-under-composite-restorations
#14
Shahin Kasraei, Abbas Shokri, Jalal Poorolajal, Samira Khajeh, Hamid Rahmani
Secondary caries is the most common cause of dental restoration failures. This study aimed to compare the diagnostic accuracy of conventional and digital intraoral radiography and cone beam computed tomography (CBCT) for detection of recurrent caries around composite restorations. mesio-occluso-distal (MOD) cavities were prepared using bur on 45 extracted sound human molar teeth. The teeth were divided into 3 groups. In the control group, cavities were restored with composite resin after etching and bonding (n=15)...
January 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/28300242/a-catalytic-enantioselective-approach-to-tetrol-bearing-vicinal-all-carbon-quaternary-stereogenic-centers
#15
Hui Yang, Kou-Sen Cao, Wen-Hua Zheng
The first highly enantioselective catalytic protocol for selective manipulation of tetrol benzylidene acetals through chiral phosphoric acid mediated oxidative desymmetrization is reported. This efficient approach provides a general access to vicinal all-carbon quaternary stereogenic center structural motifs, as well as structures containing vicinal tertiary and quaternary stereocenters enantioselectively. The synthetic utility has been furthermore demonstrated by transformations and gram-scale processes.
March 16, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28298990/an-ex-vivo-shear-and-tensile-bond-strengths-of-orthodontic-molar-tubes-bonded-using-different-techniques
#16
Elham Abu-Alhaija, Mohammad Jaradat, Ahed Alwahadni
BACKGROUND: Molar bonding procedures need continuous improvement to be widely accepted clinically and eventually replace molar bands. MATERIAL AND METHODS: The purpose of this study was to determine the effects of enamel micro-abrasion and silane coating of the base of molar tubes on shear and tensile bond strengths of orthodontic molar tubes. A total of 200 third molars were randomly allocated into five groups of 40 teeth as follows: group 1: molar tubes bonded to etched teeth (37% phosphoric acid gel; control group); group 2: molar tubes bonded to etched teeth (37% phosphoric acid) with the addition of silane to the base of molar tubes; group 3: molar tubes bonded to teeth pre-treated with 18% hydrochloric acid and pumice (micro-abrasion); group 4: molar tubes bonded to teeth pre-treated with microabrasion with the addition of silane to the base of molar tubes; group 5: molar tubes bonded to teeth pre-treated with microabrasion before conventional acid etching combined with the addition of silane to the base of molar tubes...
March 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28298121/laser-induced-white-emission-generated-by-infrared-excitation-from-eu-3-sr2ceo4-nanocrystals
#17
M Stefanski, M Lukaszewicz, D Hreniak, W Strek
The laser induced white emission (LIWE) was observed from Eu(3+):Sr2CeO4 nanocrystals. The samples were obtained in form of powders by the modified sol-gel route. The structure and morphology of the phosphors were investigated by powder X-ray diffraction and transmission electron microscope techniques. The intense LIWE occurred under reduced pressure and focused beam of near infrared laser excitation. The power and pressure dependencies exhibit evident threshold character typical for the avalanche effect. The photoconductivity of the Eu(3+):Sr2CeO4 nanocrystals measured as a function of different powers of excitation source was analyzed...
March 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28297665/mitotic-phosphorylation-of-trex1-c-terminus-disrupts-trex1-regulation-of-the-oligosaccharyltransferase-complex
#18
Martin Kucej, Charles S Fermaintt, Kun Yang, Ricardo A Irizarry-Caro, Nan Yan
TREX1 mutations are associated with several autoimmune and inflammatory diseases. The N-terminal DNase domain of TREX1 is important for preventing self-DNA from activating the interferon response. The C terminus of TREX1 is required for ER localization and regulation of oligosacchariyltransferase (OST) activity. Here, we show that during mitosis TREX1 is predominately phosphorylated at the C-terminal Serine-261 by Cyclin B/CDK1. TREX1 is dephosphorylated quickly at mitotic exit, likely by PP1/PP2-type serine/threonine phosphatase...
March 14, 2017: Cell Reports
https://www.readbyqxmd.com/read/28297310/production-and-quality-control-177-lu-nca-dotmp-as-a-potential-agent-for-bone-pain-palliation
#19
Nafise Salek, Mojtaba Shamsaei, Mohammad Ghannadi Maragheh, Simindokht Shirvani Arani, Ali Bahrami Samani
Skeletal uptake of radiolabeled-1, 4, 7, 10-tetraazacyclododecane-1, 4, 7, 10-tetramethylene phosphoric acid (e.g., (177) Lu-DOTMP) complex, is used for bone pain palliation. The moderate energy of β-emitting 177Lu (T1/2=6.7 d,Eβmax=497 keV) has been considered as a potential radionuclide for development of the bone-seeking radiopharmaceutical. Since the specific activity of the radiolabeled carrier molecules should be high, the "no-carrier-added radionuclides" have significant roles in nuclear medicine...
November 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28295853/matrine-regulates-th1-th2-cytokine-responses-in-rheumatoid-arthritis-by-attenuating-the-nf-%C3%AE-b-signaling
#20
Yaojie Niu, Qiumei Dong, Rongheng Li
To investigate the efficacy and mechanisms of matrine, a component derived from Sophora flavescens in treatment of rheumatoid arthritis (RA), a rat model of RA was established. Compared to control rats, matrine significantly mitigated inflammation and severity of RA (paw volume and articular index (AI) score). Using either mice splenic T cells stimulated with PMA/ionomycin or rat splenic T cells, the levels of Th1 and Th2 responses were determined by flow cytometry, quantitative RT-PCR and ELISA. Furthermore, the levels of NF-κBp65 (RelA), IκBα and phosphor-IκBα in T cells were determined by Western blot...
March 15, 2017: Cell Biology International
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