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https://www.readbyqxmd.com/read/29145432/evaluating-the-intensity-of-fire-at-the-acheulian-site-of-gesher-benot-ya-aqov-spatial-and-thermoluminescence-analyses
#1
Nira Alperson-Afil, Daniel Richter, Naama Goren-Inbar
This manuscript presents an attempt to evaluate the intensity of fire through spatial patterning and thermoluminescence methodology. Previous studies of Layer II-6 Level 2 at the Acheulian site of Gesher Benot Ya'aqov suggested that hominins differentiated their activities across space, including multiple activities around a hearth reconstructed on the basis of the distribution of burned flint artifacts. A transect of ~4 m was extended from the center of the reconstructed hearth of Level 2 to its periphery in order to examine the intensity of fire...
2017: PloS One
https://www.readbyqxmd.com/read/29145135/forced-and-long-term-degradation-assays-of-tenoxicam-piroxicam-and-meloxicam-in-river-water-degradation-products-and-adsorption-to-sediment
#2
Juan J Jiménez, Beatriz E Muñoz, María I Sánchez, Rafael Pardo
The fate of the pharmaceutical drugs tenoxicam, piroxicam and meloxicam in river water is evaluated here for first time. So, biological, photochemical and thermal degradation assays have been conducted to estimate their degradation rates and know their degradation products. Results indicated that the direct sunlight irradiation, without any protection, promoted a fast degradation of the oxicams while the chemical reactions in solution were less important. The biological degradation in water was negligible except for tenoxicam in whose case its influence was scarce...
October 25, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145090/comparative-study-of-dissolved-organic-matter-generated-from-activated-sludge-during-exposure-to-hypochlorite-hydrogen-peroxide-acid-and-alkaline-implications-for-on-line-chemical-cleaning-of-mbr
#3
Weiwei Cai, Yu Liu
Although on-line chemical cleaning has been extensively employed for maintaining the MBR permeability, little attention has been given to the negative impacts of such prevalent membrane cleaning practice. This study thus comparatively investigated the potential release of dissolved organic matter (DOM) from activated sludge upon the exposure to different kinds of frequently-used cleaning reagents, i.e. NaClO, H2O2, HCl and NaOH. It was found that NaClO at 50 and 80 mg L(-1) triggered significant release of DOM, while NaOH strongly promoted soluble nitrogen release...
November 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145088/phosphorus-recovery-and-leaching-of-trace-elements-from-incinerated-sewage-sludge-ash-issa
#4
Le Fang, Jiang-Shan Li, Ming Zhi Guo, C R Cheeseman, Daniel C W Tsang, Shane Donatello, Chi Sun Poon
Chemical extraction of phosphorus (P) from incinerated sewage sludge ash (ISSA) is adversely influenced by co-dissolution of metals and metalloids. This study investigated P recovery and leaching of Zn, Cu, Pb, As and Ni from ISSA using inorganic acids (sulphuric acid and nitric acid), organic acids (oxalic acid and citric acid), and chelating agents (ethylenediaminetetraacetic acid (EDTA) and ethylene diamine tetramethylene phosphonate (EDTMP)). The aim of this study was to optimize a leaching process to recover P-leachate with high purity for P fertilizer production...
November 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/29144809/preserved-proinsulin-secretion-in-long-standing-type-1-diabetes
#5
Devin W Steenkamp, Jose M Cacicedo, Ayse Sahin-Efe, Catherine Sullivan, Elliot Sternthal
OBJECTIVE: Recent literature, has reported preserved residual beta cell function, (c-peptide "microsecretion") in many individuals with long standing type 1 diabetes. However, the concentrations of detectable insulin/c-peptide in the serum are usually very low, and beta cell mass is typically negligible. Proinsulin is measurable in the early years after diagnosis, consistent with the presence of residual functioning beta cells. However, individuals are not expected to secrete significant amounts of proinsulin beyond the early years after diagnosis...
November 16, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/29144287/assessment-of-a-danish-sludge-treatment-reed-bed-system-and-a-stockpile-area-using-substance-flow-analysis
#6
Julie D Larsen, Steen M Nielsen, Charlotte Scheutz
Sludge treatment reed bed (STRB) systems combine dewatering, stabilisation and long-term storage of sludge. The main objective of this study was to investigate how substance concentrations change in the sludge residue during treatment and to conduct substance flow analyses covering the flow of substances in an STRB system over a 12-year treatment period, followed by three months' post-treatment in a stockpile area (SPA). Samples of sludge, reject water and sludge residue of different ages were collected at two Danish STRB system facilities and analysed for content of relevant substances...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29143834/cobalt-nickel-and-iron-complexes-of-8-hydroxyquinoline-di-2-picolyl-amine-for-light-driven-hydrogen-evolution
#7
Nadia Alessandra Carmo Dos Santos, Mirco Natali, Elena Badetti, Klaus Wurst, Giulia Licini, Cristiano Zonta
Novel cobalt, nickel, and iron complexes based on the pentadentate 8-hydroxyquinoline-di(2-picolyl)amine ligand were synthesized and thoroughly characterized. X-ray structures of both the cobalt and iron complexes were also obtained, showing the tendency to adopt a pseudo-octahedral geometry by coordination of an additional sixth ligand. These metal complexes were then studied as potential hydrogen-evolving catalysts (HECs) under both electrochemical and light-driven conditions. In particular, two different photochemical systems were tested involving either Ru(bpy)3(2+)/ascorbic acid or Ir(ppy)2(bpy)(+)/TEA sensitizer/sacrificial donor couples...
November 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29143024/an-analysis-of-the-explosion-limits-of-hydrogen-oxygen-mixtures-with-nonlinear-chain-reactions
#8
Wenkai Liang, Chung K Law
The ignition boundary of hydrogen/oxygen mixtures is a Z-shaped curve in the pressure-temperature space, demonstrating the existence of three explosion limits. In this study, a general analysis governing all the three explosion limits in an isothermal environment is performed by considering both linear chain reactions (reactant-radical reactions) and nonlinear chain reactions (radical-radical reactions), in addition to the zeroth-order reactant-reactant reactions. For the nonlinear reactions, it is further shown that the linear-nonlinear coupling has the major influence, while the effect of nonlinear-nonlinear coupling is negligible...
November 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29142850/complications-from-tracheal-resection-for-thyroid-carcinoma
#9
REVIEW
Nicola Rotolo, Maria Cattoni, Andrea Imperatori
Thyroidectomy associated to en bloc tracheal resection with end-to-end anastomosis is the treatment of choice of thyroid tumor invading the tracheal wall and is associated with a good prognosis. However, the postoperative morbidity is not irrelevant. The present review aims to discuss the complications occurring after this aggressive surgical procedure. The search was performed using PubMed through an overarching for the following terms: "complication of tracheal resection [AND] invasive thyroid cancer". Postoperative complications rate after tracheal sleeve resection with end-to-end anastomosis for thyroid cancer invading tracheal wall range from 15% to 39%...
October 2017: Gland Surgery
https://www.readbyqxmd.com/read/29142830/parathyroid-hormone-and-serum-calcium-levels-measurements-as-predictors-of-postoperative-hypocalcemia-in-total-thyroidectomy
#10
Mohammed Algarni, Rajab Alzahrani, Gianlorenzo Dionigi, Al-Hakami Hadi, Haia AlSubayea
Background: The rules of quantitative measures such as parathyroid hormone (PTH) levels in the first hours following total thyroidectomy have since been validated repeatedly. Such measures play an integral rule in identifying patients at significant risk for hypocalcaemia and have allowed for earlier supplementation of these patients with calcium with or without vitamin D. Methods: A retrospective analysis was conducted of 40 consecutive patients with well differentiated thyroid cancer (WDTC) who underwent total thyroidectomy without central neck dissection (CND) as an initial surgery and no comorbidity at King Abdulaziz Medical City (National Guard hospital), between July 2011 and July 2012...
October 2017: Gland Surgery
https://www.readbyqxmd.com/read/29142787/sleep-apnea-symptoms-and-cardiovascular-disease-risks-among-haitian-medical-students
#11
Diana M Rosenthal, Donaldson F Conserve, Dodley Severe, Michaele A Gedeon, Ferdinand Zizi, Georges Casimir, Samy I McFarlane, Girardin Jean Louis
Sleep apnea is a prevalent sleep disorder that disproportionately affects blacks and has been previously studied among Caribbean-born blacks in Brooklyn, New York, but there has been negligible research in the Caribbean, specifically Haiti, and developing countries on this pressing health issue. A total of 373 medical students (mean age=20.6 years ± 2.3 years) from a medical school in Haiti participated in this study. Participants were administered a questionnaire assessing their sleep health and cardiovascular outcomes...
April 2017: Journal of Sleep Disorders & Therapy
https://www.readbyqxmd.com/read/29141708/sensitive-detection-of-neonicotinoid-insecticides-and-other-selected-pesticides-in-pollen-and-nectar-using-nanoflow-liquid-chromatography-orbitrap-tandem-mass-spectrometry
#12
David Moreno-González, Jaime Alcántara-Durán, Bienvenida Gilbert-López, Miriam Beneito-Cambra, Víctor M Cutillas, Łukasz Rajski, Antonio Molina-Díaz, Juan F García-Reyes
In this work, a new method based on nanoflow LC with high-resolution MS was developed for the determination ofeight pesticides in pollen and nectar samples, including neonicotinoid insecticides and other selected pesticides commonly found in bees and beeswax. Detection was undertaken with a hybrid quadrupole-Orbitrap mass spectrometer (Q Exactive™) equipped with a commercial nanospray ion source. The extraction of pesticides from pollen samples was performed by a modified micro-QuEChERS method scaled down to Eppendorf tubes, whereas nectar samples were simply diluted with a water–methanol (95 + 5, v/v) solution...
November 15, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/29141414/orientational-cross-correlations-between-entangled-branch-polymers-in-primitive-chain-network-simulations
#13
Yuichi Masubuchi, Ankita Pandey, Yoshifumi Amamoto, Takashi Uneyama
Although it has not been frequently discussed, contributions of the orientational cross-correlation (OCC) between entangled polymers are not negligible in the relaxation modulus. In the present study, OCC contributions were investigated for 4- and 6-arm star-branched and H-branched polymers by means of multi-chain slip-link simulations. Owing to the molecular-level description of the simulation, the segment orientation was traced separately for each molecule as well as each subchain composing the molecules...
November 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29141227/in-situ-fixation-redefines-quiescence-and-early-activation-of-skeletal-muscle-stem-cells
#14
Léo Machado, Joana Esteves de Lima, Odile Fabre, Caroline Proux, Rachel Legendre, Anikó Szegedi, Hugo Varet, Lars Roed Ingerslev, Romain Barrès, Frédéric Relaix, Philippos Mourikis
State of the art techniques have been developed to isolate and analyze cells from various tissues, aiming to capture their in vivo state. However, the majority of cell isolation protocols involve lengthy mechanical and enzymatic dissociation steps followed by flow cytometry, exposing cells to stress and disrupting their physiological niche. Focusing on adult skeletal muscle stem cells, we have developed a protocol that circumvents the impact of isolation procedures and captures cells in their native quiescent state...
November 14, 2017: Cell Reports
https://www.readbyqxmd.com/read/29140643/assessment-of-interventions-to-improve-air-quality-in-a-livestock-building
#15
T Renée Anthony, Anthony Y Yang, Thomas M Peters
This study examined the effectiveness of engineering controls to reduce contaminant concentrations in a swine farrowing room during winter in the U.S. Midwest. Over two winters, changes in air quality were evaluated following installation of a 1700 m3 h-1 (1000 cfm) recirculating ventilation system to provide 5.4 air exchanges per hour. This system incorporated one of two readily available dust control systems, one based on filtration and the other on cyclonic treatment. A second treatment evaluated reductions in carbon dioxide (CO2) associated with replacement of standard, unvented gas-fired heaters with new vented heaters, installed between the two winter test periods...
November 20, 2017: Journal of Agricultural Safety and Health
https://www.readbyqxmd.com/read/29139595/structure-and-electronic-properties-of-unnatural-base-pairs-role-of-dispersion-interactions
#16
Ayan Datta, Sk Jahiruddin, Nilangshu Mandal
Recent report of the success of unnatural base pairs (UBPs) like d5SICS-dNaM to be incorporated within the gene sequence and get replicated with DNA is an important milestone in synthetic biology. Followed by this, several other UBPs like dTPT3-dNaM, dTPT3-dFIMO, dTPT3-IMO, dTPT3-FEMO, FTPT3-NaM, FTPT3-FIMO, FTPT3-IMO, FTPT3-FEMO, have demonstrated similar or better retention and fidelity inside cell. Among these base pairs, dNaM-dTPT3 has been optimized to be a better fit inside a pAIO plasmid. Based on both implicit and explicit dispersion corrected density functional theory (DFT) calculations, we show that although the set of UBPs are significantly diverse in their elemental and structural configuration they do share a common trait of favoring a slipped parallel stacked dimer arrangement...
November 15, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/29139338/freeze-drying-of-silica-nanoparticles-redispersibility-toward-nanomedicine-applications
#17
Agustin S Picco, Larissa F Ferreira, Michelle S Liberato, Gabriela B Mondo, Mateus B Cardoso
AIM: To study freeze-drying of silica nanoparticles (SiO2NPs) in order to find suitable conditions to produce lyophilized powders with no aggregation after resuspension and storage. METHODS: SiO2NPs were synthesized using a Stöber-based procedure, and characterized by scanning electron microscopy, dynamic light scattering and nitrogen adsorption/desorption isotherms. SiO2NPs hydrodynamic diameters were compared prior and after freeze-drying in the presence/absence of carbohydrate protectants...
November 15, 2017: Nanomedicine
https://www.readbyqxmd.com/read/29139298/sic-nanofiber-mat-a-broadband-microwave-absorber-and-the-alignment-effect
#18
Yi Hou, Laifei Cheng, Yani Zhang, Yong Yang, Chaoran Deng, Zhihong Yang, Qi Chen, Xiaoqing Du, Lianxi Zheng
Fiber alignment is a key factor that determines the physical properties of nanofiber mats. In this work, SiC nanofiber mats with or without fiber alignment are fabricated via electrospinning and the microwave electromagnetic (EM) properties of their silicone resin composites (5wt.%) are investigated in 2-18 GHz. By comparing with the composite containing smashed nanofiber, it is found that the nanofiber mats show superior dielectric loss and a minimal reflection loss (RL) of around -49 dB at 8.6 GHz and 4.3 mm thickness, associated with a broad effective absorption (<-10 dB) bandwidth (EAB) of about 7...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29138537/development-of-novel-ultrashort-antimicrobial-peptide-nanoparticles-with-potent-antimicrobial-and-antibiofilm-activities-against-multidrug-resistant-bacteria
#19
Ammar Almaaytah, Gubran Khalil Mohammed, Ahmad Abualhaijaa, Qosay Al-Balas
Conventional antibiotics are facing strong microbial resistance that has recently reached critical levels. This situation is leading to significantly reduced therapeutic potential of a huge proportion of antimicrobial agents currently used in clinical settings. Antimicrobial peptides (AMPs) could provide the medical community with an alternative strategy to traditional antibiotics for combating microbial resistance. However, the development of AMPs into clinically useful antibiotics is hampered by their relatively low stability, toxicity, and high manufacturing costs...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/29137979/acute-and-chronic-cadmium-telluride-quantum-dots-exposed-human-bronchial-epithelial-cells-the-effects-of-particle-sizes-on-their-cytotoxicity-and-carcinogenicity
#20
Wei Zheng, Yan-Ming Xu, Dan-Dan Wu, Yue Yao, Zhan-Ling Liang, Heng Wee Tan, Andy T Y Lau
Quantum dots (QDs) are semiconducting nanocrystals with unique optical properties. When coated with shell/capping, QDs are not deleterious to cells and organisms. However, when QDs are retained in the cellular environment for a certain period of time, their coatings may be degraded, yielding "naked" QDs. Although some studies have documented the acute effects of QDs in various cell lines, however, to our knowledge, there are no published studies on the chronic effects of QDs in normal lung cells. In this study, we therefore sought to study the effects of cadmium telluride (CdTe) QDs of various particles sizes on their cytotoxicity and carcinogenicity in normal human bronchial epithelial cells (BEAS-2B)...
November 11, 2017: Biochemical and Biophysical Research Communications
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