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https://www.readbyqxmd.com/read/30025239/nitrogen-removal-rates-in-a-frigid-high-altitude-river-estimated-by-measuring-dissolved-n-2-and-n-2-o
#1
Gongqin Wang, Junfeng Wang, Xinghui Xia, Liwei Zhang, Sibo Zhang, William H McDowell, Lijun Hou
Rivers are important sites of both nitrogen removal and emission of nitrous oxide (N2 O), a powerful greenhouse gas. Previous measurements have focused on nitrogen-rich temperate rivers, with cold, low-nitrogen river systems at high-altitude receiving less attention. Here, nitrogen removal rates were estimated by directly measuring dissolved N2 and N2 O of the Yellow River in its source region of the Tibetan Plateau, a frigid high-altitude environment. We measured the dissolved N2 and N2 O using N2 :Ar ratio method and headspace equilibrium technique, respectively...
July 16, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/30025238/hydro-biogeochemical-processes-and-their-implications-for-ulva-prolifera-blooms-and-expansion-in-the-world-s-largest-green-tide-occurrence-region-yellow-sea-china
#2
Qinsheng Wei, Baodong Wang, Qingzhen Yao, Mingzhu Fu, Junchuan Sun, Bochao Xu, Zhigang Yu
The hydro-biogeochemical processes in the world's largest area of green tide occurrence, off the Jiangsu coast in the Yellow Sea, are investigated in the summer, and their implications for Ulva prolifera blooms are discussed. The results show that the offshore transport of coastal water and the inshore upwelling of offshore bottom water both occur off the Jiangsu coast, and the upwelling position is consistent with the 20- to 30-m isobath off the Subei Shoal. The upwelling results in nutrient supplementation off the shoal, where a rapid decrease in the suspended particulate matter content contributes to good light conditions...
July 16, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/30025181/one-dimensional-arsenic-allotropes-polymerization-of-yellow-arsenic-inside-single-wall-carbon-nanotubes
#3
Martin Hart, Ji Chen, Angelos Michaelides, Andrea Sella, Milo S P Shaffer, Christoph Günter Salzmann
The pnictogen nanomaterials, including phosphorene and arsenene, display remarkable electronic and chemical properties. Yet, the structural diversity that these main group elements are capable of is still poorly explored. Here we fill single-wall carbon nanotubes with elemental arsenic from the vapor phase. Using electron microscopy, we find chains of highly reactive As₄ molecules as well as two new one-dimensional allotropes of arsenic: a single-stranded zig-zag chain and a double-stranded zig-zag ladder...
July 19, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/30025101/characterization-and-regulation-of-gap-junctions-in-porcine-ciliary-epithelium
#4
Stanley Ka-Lok Li, Sze-Wan Shan, Hoi-Lam Li, Angela King-Wah Cheng, Feng Pan, Shea-Ping Yip, Mortimer M Civan, Chi-Ho To, Chi-Wai Do
Purpose: Gap junctions provide a conduit between the intracellular fluids of the pigmented (PE) and non-pigmented (NPE) ciliary epithelial cells, and are therefore critical in the secretion of the aqueous humor (AH). However, opinions differ concerning the connexin (Cx) composition of the gap junctions. Therefore, we aimed to characterize the expression of Cx in the porcine ciliary epithelium (CE), a favorable model for humans; and determine the contribution of the highest expressed Cx to AH secretion...
July 2, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/30024205/yellow-flags-as-predictors-of-rehabilitation-outcome-in-chronic-low-back-pain
#5
Manuela Glattacker, Katja Heyduck, Teresa Jakob
OBJECTIVE: While it is agreed that yellow flags (prognostic psychosocial factors for poor recovery in low back pain) predict pain-related outcomes, uncertainty remains regarding which constructs are the central ones, particularly as there is considerable conceptual overlap between constructs. Therefore, the aim of our study was to analyze the distinctiveness of different psychological factors in predicting rehabilitation outcomes in a sample of patients with chronic low back pain (CLBP) in a rehabilitation setting...
July 19, 2018: Rehabilitation Psychology
https://www.readbyqxmd.com/read/30023918/manipulating-metallogel-properties-by-luminogens-and-their-applications-in-cell-imaging
#6
Arnab Biswas, Sujay Mukhopadhyay, Roop Shikha Singh, Ashish Kumar, Nishant Kumar Rana, Biplob Koch, Daya Shankar Pandey
Manipulating gelation properties of the isomeric zinc-terpyridine complexes C-1 (nongelator) and C-2 (gelator) using three different luminescent dyes, viz., acridine yellow (AY), ethidium bromide (EB), and azido-boron dipyrromethene, have been described. Hybrid gels created by the combination of C-1, C-2, and above-mentioned dyes have been termed complex-luminogen mixed gels (CLMGs). Ensuing CLMGs have been thoroughly characterized by spectral, morphological, and rheological studies. Cytotoxicity measurements and imaging against breast cancer cell line MDA-MB-231 unveiled that three out of the five CLMGs can be effectively used for cell imaging...
May 31, 2018: ACS Omega
https://www.readbyqxmd.com/read/30023842/firefly-luciferase-mutant-with-enhanced-activity-and-thermostability
#7
Tania Pozzo, Farhima Akter, Yoko Nomura, Angelique Y Louie, Yohei Yokobayashi
The luciferase isolated from the firefly Photinus pyralis (Ppy) catalyzes a two-step reaction that results in the oxidation of d-luciferin accompanied by emission of yellow-green light with a peak at 560 nm. Among many applications, Ppy luciferase has been used extensively as a reporter gene in living cells and organisms. However, some biological applications are limited by the low stability of the luciferase and limited intracellular luciferin concentration. To address these challenges, efforts to protein engineer Ppy luciferase have resulted in a number of mutants with improved properties such as thermostability, pH tolerance, and catalytic turn over...
March 31, 2018: ACS Omega
https://www.readbyqxmd.com/read/30023778/fluorescent-small-molecules-are-big-enough-to-sense-biomacromolecule-synthesis-of-aromatic-thioesters-and-understanding-their-interactions-with-ctdna
#8
Tamanna Mallick, Abhijit Karmakar, Shaikh Batuta, Giasuddin Ahamed, Sreeparna Das, Md Niharul Alam, Madhumathan Mukherjee, Nilanjana Das, Debabrata Mandal, Naznin Ara Begum
The visible fluorescent chromophoric moiety present in the water-soluble photoactive yellow protein (PYP) of Ectothiorhodospira halophila is p -hydroxycinnamic acid linked to the cysteine residue (Cys-69) by a thioester bond and it controls the key photoinduced biological processes of the host organism. In the present work, we have synthesized and characterized three structurally different thiophenyl esters [viz., p- hydroxycinnamic-thiophenyl ester ( 1 ), p - N , N -dimethylaminocinnamic-thiophenyl ester ( 2 ), and S -phenyl-3-(4-chlorophenyl)-3-(phenylthio)propanethioate ( 3 )] in addition to a novel (to the best of our knowledge) stilbene-type olefinic compound, N 1 , N 1 , N 2 , N 2 -tetramethyl-1,2-bis(phenylthio)ethene-1,2-diamine ( 4 ), under the same reaction condition...
January 31, 2018: ACS Omega
https://www.readbyqxmd.com/read/30023601/ph-regulated-synthesis-of-trypsin-templated-copper-nanoclusters-with-blue-and-yellow-fluorescent-emission
#9
Jie Feng, Yonglei Chen, Yangxia Han, Juanjuan Liu, Sudai Ma, Huige Zhang, Xingguo Chen
In this article, a simple protocol to prepare water-soluble fluorescent copper nanoclusters (CuNCs) using trypsin as a stabilizer and hydrazine hydrate as a reducing agent was reported. It was found that the pH of the reaction solution was critical in determining the fluorescence of CuNCs. CuNCs with blue and yellow fluorescent emission were obtained under basic and acidic conditions, respectively. Although the detailed formation mechanisms of these CuNCs required further analysis, the synthetic route was promising for preparing different fluorescent metal NCs for applications...
December 31, 2017: ACS Omega
https://www.readbyqxmd.com/read/30022130/immature-particles-and-capsid-free-viral-rna-produced-by-yellow-fever-virus-infected-cells-stimulate-plasmacytoid-dendritic-cells-to-secrete-interferons
#10
Laura Sinigaglia, Ségolène Gracias, Elodie Décembre, Matthieu Fritz, Daniela Bruni, Nikaïa Smith, Jean-Philippe Herbeuval, Annette Martin, Marlène Dreux, Frédéric Tangy, Nolwenn Jouvenet
Plasmacytoid dendritic cells (pDCs) are specialized in the production of interferons (IFNs) in response to viral infections. The Flaviviridae family comprises enveloped RNA viruses such as Hepatitis C virus (HCV) and Dengue virus (DENV). Cell-free flaviviridae virions poorly stimulate pDCs to produce IFN. By contrast, cells infected with HCV and DENV potently stimulate pDCs via short-range delivery of viral RNAs, which are either packaged within immature virions or secreted exosomes. We report that cells infected with Yellow fever virus (YFV), the prototypical flavivirus, stimulated pDCs to produce IFNs in a TLR7- and cell contact- dependent manner...
July 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30021863/plumage-coloration-and-social-context-influence-male-investment-in-song
#11
L J Henderson, Kathleen R Brazeal, Thomas P Hahn
Animals use multiple signals to attract mates, including elaborate song, brightly coloured ornaments and physical displays. Female birds often prefer both elaborate male song and intense carotenoid-based plumage coloration. This could lead less visually ornamented males to increase song production to maximize their attractiveness to females. We tested this possibility in the highly social and non-territorial house finch ( Haemorhous mexicanus ), in which females discriminate among males based on both song and on the intensity of red carotenoid-based plumage coloration...
July 2018: Biology Letters
https://www.readbyqxmd.com/read/30021822/yellow-fever-virus-diagnostics-for-a-persistent-arboviral-threat
#12
Jesse J Waggoner, Alejandra Rojas, Benjamin A Pinsky
Yellow fever (YF) is the prototypical hemorrhagic fever and results from infection with Yellow Fever Virus (YFV), which is endemic to regions of Africa and South America. Despite the availability of an effective vaccine, YFV continues to cause disease throughout endemic regions, including intermittent large outbreaks among under-vaccinated populations. A number of diagnostic methods and assays have been described for the detection of YFV infection, including viral culture, molecular testing, serology, and antigen detection...
July 18, 2018: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/30021322/a-survey-of-multiple-pesticide-residues-in-pollen-and-beebread-collected-in-china
#13
Zhou Tong, Jinsheng Duan, Yancan Wu, Qiongqiong Liu, Qibao He, Yanhong Shi, Linsheng Yu, Haiqun Cao
Honeybees, as major pollinators, make vital contributions to humans and ecosystems. Worryingly, a phenomenon known as honeybee colony losses has been reported in recent years. One of the factors underlying the occurrence of honeybee colony losses is exposure of honey bees to pesticide residues in their food, which cause detrimental sublethal effects and may lead to the collapse of their colonies. In this paper, 189 pollen samples and 226 beebread samples collected from five major beekeeping areas in China were analyzed from spring 2016 to autumn 2017...
November 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/30021298/short-and-medium-chain-chlorinated-paraffins-in-the-henan-section-of-the-yellow-river-occurrences-fates-and-fluxes
#14
Qilu Li, Xianghui Cheng, Yanrui Cui, Jianhui Sun, Jun Li, Gan Zhang
Short- and medium-chain chlorinated paraffins (SCCPs and MCCPs) were measured in sediment and suspended particulate matter (SPM) from the middle and lower reaches of the Yellow River in the three seasons to elucidate their environmental behavior. The mean concentrations of ∑SCCPs and ∑MCCPs were 262 and 97.1 ng g-1  dw (dry weight) in sediment and 17,055 and 2573 ng g-1  dw in SPM, respectively, and higher SCCP levels did not clearly reflect a shift to more MCCPs in this section of the Yellow River...
November 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/30020871/case-260
#15
Ryan G Short, Tina D Tailor
History A 31-year-old woman with a history of bilateral orthotopic lung transplantation performed 10 months earlier for cystic fibrosis presented for a routine follow-up appointment, with her chief symptom being a cough. The cough started approximately 1 month prior to this appointment and was minimally productive of clear to yellow phlegm. In addition to her cough, she reported increased sinus congestion and a sensation of "something in her upper chest." She denied shortness of breath, wheezing, hemoptysis, or cigarette smoking...
August 2018: Radiology
https://www.readbyqxmd.com/read/30020538/mechanochromic-switching-between-delayed-fluorescence-and-phosphorescence-of-luminescent-coordination-polymers-composed-of-dinuclear-copper-i-iodide-rhombic-cores
#16
Atsushi Kobayashi, Yuya Yoshida, Masaki Yoshida, Masako Kato
The synthesis and photophysical properties of two luminescent Cu(I) coordination polymers, [Cu2I2(PPh3)2(3-tpyb)]n and [Cu2I2(PPh3)2(4-tpyb)]n (Cu-3-tpyb and Cu-4-tpyb; PPh3 = triphenylphosphine, m-tpyb = 1,3,5-tris(n-pyridyl)benzene (m = 3, 4)), are described. X-ray structural analysis indicated that one-dimensional coordination chains comprising rhombic {Cu2I2(PPh3)2} cores and m-tpyb bridging ligands were formed. Both Cu-3-tpyb and Cu-4-tpyb exhibited blue-to-yellow thermally activated delayed fluorescence (TADF) that originated from mixing of the metal-to-ligand and halide-to-ligand charge-transfer excited states and moderate emission quantum yields of 0...
July 18, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/30020444/assessments-of-temporal-variations-in-haplotypes-of-candidatus-liberibacter-solanacearum-and-its-vector-the-potato-psyllid-in-potato-fields-and-native-vegetation
#17
Fekede Workneh, Li Paetzold, Adrian Silva, Christopher Johnson, Arash Rashed, Ismael Badillo-Vargas, Neil C Gudmestad, Charlie M Rush
The potato psyllid, Bactericera cockerelli (Sulc) (Hemiptera: Triozidae), had been known for nearly a century to cause psyllid yellows of solanaceous crops. However, it has only been a decade since the insect was discovered to transmit the bacterium 'Candidatus Liberibacter solanacearum' (Lso), which putatively causes potato zebra chip disease. This project was initiated to quantify temporal incidences of haplotypes of the psyllid (Central, Southwestern, and Western) and Lso (A, B) in potato fields and in native vegetation...
July 18, 2018: Environmental Entomology
https://www.readbyqxmd.com/read/30020357/-health-risk-zoning-yellow-fever-from-a-geographical-perspective-in-la-macarena-department-of-meta-colombia
#18
Larry Niño
This paper attempts to zone yellow fever risk in La Macarena (department of Meta, Colombia) in terms of environmental hazards and socio-economic vulnerabilities. An ecological study was carried out, in which data published from 2007 to 2013 on conditions of the municipality were integrated into a geographic information system. Through a superposition of map layers, magnitudes of hazard and vulnerability proportional to the degree of severity were obtained. As a result the spatial heterogeneity of the risk of yellow fever was described, suggesting that the areas surrounding populated centers, roads and rivers present the highest probability of transmission...
January 2018: Salud Colectiva
https://www.readbyqxmd.com/read/30020143/near-infrared-spectroscopy-in-vegetables-and-humans-an-observational-study
#19
Ronald A Kahn, Anelechi Anyanwu
BACKGROUND: Cerebral near-infrared spectroscopy (NIRS) of tissue oxygen saturation is claimed to be a surrogate marker for global cerebral perfusion. Increasingly, NIRS target-based therapy has been used during cardiac surgery in the hope of decreasing the incidence of adverse neurological outcome. OBJECTIVES: We report NIRS values for some common vegetables and faculty at a world-class medical institution. DESIGN: Observational nonblinded study...
July 16, 2018: European Journal of Anaesthesiology
https://www.readbyqxmd.com/read/30020046/-lupus-like-syndrome-in-patients-treated-with-anti-tnf-%C3%AE-factors
#20
Elvan Şentürk, Savaş Özsu, Erhan Çapkın, Atilla Türkyilmaz
A 56-year-old male patient presented with history of complaints of night sweats, short ness of breath, cough and yellow sputum, fever. There was a history of tumor neurosis factor-alpha (etanercept) due to ankylosing spondylitis. Postero-anterior chest X-ray; the right sinus was blunt, the right diaphragm had linear opacity compatible with atelectasis extending from the diaphragm to the periphery, left pleural effusion, left middle basal paracardiac opacity. In thorax tomography; pleural effusion and pericardial effusion and compressive atelectasis in the adjacent lung parenchyma were detected...
March 2018: Tüberküloz Ve Toraks
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