keyword
MENU ▼
Read by QxMD icon Read
search

water

keyword
https://www.readbyqxmd.com/read/28813107/climatic-characteristics-of-the-2010-2016-drought-in-the-semiarid-northeast-brazil-region
#1
José A Marengo, Lincoln M Alves, Regina C S Alvala, Ana Paula Cunha, Sheila Brito, Osvaldo L L Moraes
This study discusses the climatological aspects of the most severe drought ever recorded in the semiarid region Northeast Brazil. Droughts are recurrent in the region and while El Nino has driven some of these events others are more dependent on the tropical North Atlantic sea surface temperature fields. The drought affecting this region during the last 5 years shows an intensity and impact not seen in several decades in the regional economy and society. The analysis of this event using drought indicators as well as meteorological fields shows that since the middle 1990s to 2016, 16 out of 25 years experienced rainfall below normal...
August 14, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28813075/violence-in-schools-and-the-voice-of-teachers
#2
Rodrigo Dornelas, Thaynara Alves Dos Santos, Daniela Sena de Oliveira, Roxane de Alencar Irineu, Aline Brito, Kelly Silva
Purpose: To correlate self-reporting of voice disorders with habits that impact voice production and situations of violence experienced by teachers. Methods: The study involved 41 elementary-school teachers of rural and urban areas. Two instruments were used for data collection: The Vocal Production Condition - Teacher (CPV-P) questionnaire and the Screening Index for Voice Disorders - ITDV. The chi-square test was used to verify association among variables with a significance level of 5%...
August 10, 2017: CoDAS
https://www.readbyqxmd.com/read/28813053/copper-ii-benzimidazole-complexes-as-efficient-fluorescent-probes-for-l-cysteine-in-water
#3
Duraiyarasu Maheshwaran, Selvarasu Priyanga, Ramasamy Mayilmurugan
Copper(ii) complexes [Cu(L1)(H2O)2](SO3CF3)21 and [Cu(L2)(H2O)2](SO3CF3)22 based on 2,6-bis(benzimidazolyl)pyridine were synthesized and are reported herein as highly selective "turn-on" optical probes for l-cysteine. The Cu(ii)/Cu(i) redox potential of probe 1 (0.14 V vs. NHE) was lower than that of 2 (0.233 V vs. NHE) in water. The molecular structure of 2 adopted a square pyramidal geometry (τ = 0.2545), with the Cu-Npy bond (1.958 Å) of its middle pyridine unit being shorter than the other two Cu-Nbenzim bonds (Cu-N, 1...
August 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28813043/folic-acid-supramolecular-ionogels
#4
Rahul Ranjan, Kamla Rawat, H B Bohidar
Herein, we report on folic acid (FA, a low molecular weight gelator) thermoreversible supramolecular organo (in 1 : 1 (v/v) water-DMSO binary solvent), and ionogels made in 1-ethyl-3-methyl imidazolium chloride, [C2mim][Cl], and 1-octyl-3-methyl imidazolium chloride, [C8mim][Cl], solutions with 0.1 ≤ [IL] ≤ 5% (w/v). The self-assembled fibrils of folic acid were largely formed due to secondary forces, such as π-π stacking, H-bonding, and hydrophobic interactions above a gelator concentration of 0...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28813020/nine-new-triterpene-glycosides-magnumosides-a%C3%A2-a%C3%A2-b%C3%A2-b%C3%A2-c%C3%A2-c%C3%A2-and-c%C3%A2-from-the-vietnamese-sea-cucumber-neothyonidium-massinium-magnum-structures-and-activities-against-tumor-cells-independently-and-in-synergy-with-radioactive-irradiation
#5
Alexandra S Silchenko, Anatoly I Kalinovsky, Sergey A Avilov, Vladimir I Kalinin, Pelageya V Andrijaschenko, Pavel S Dmitrenok, Ekaterina A Chingizova, Svetlana P Ermakova, Olesya S Malyarenko, Tatyana N Dautova
Nine new sulfated triterpene glycosides, magnumosides A₁ (1), A₂ (2), A₃ (3), A₄ (4), B₁ (5), B₂ (6), C₁ (7), C₂ (8) and C₄ (9) as well as a known colochiroside B₂ (10) have been isolated from the tropical Indo-West Pacific sea cucumber Neothynidium (=Massinium) magnum (Phyllophoridae, Dendrochirotida) collected in the Vietnamese shallow waters. The structures of new glycosides were elucidated by 2D NMR spectroscopy and mass-spectrometry. All the isolated new glycosides were characterized by the non-holostane type lanostane aglycones having 18(16)-lactone and 7(8)-double bond and differed from each other by the side chains and carbohydrate moieties structures...
August 16, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28813008/dietary-fructose-enhances-the-ability-of-low-concentrations-of-angiotensin-ii-to-stimulate-proximal-tubule-na%C3%A2-%C2%BA-reabsorption
#6
Agustin Gonzalez-Vicente, Pablo D Cabral, Nancy J Hong, Jessica Asirwatham, Nianxin Yang, Jessica M Berthiaume, Fernando P Dominici, Jeffrey L Garvin
Fructose-enriched diets cause salt-sensitive hypertension. Proximal tubules (PTs) reabsorb 70% of the water and salt filtered through the glomerulus. Angiotensin II (Ang II) regulates this process. Normally, dietary salt reduces Ang II allowing the kidney to excrete more salt, thereby preventing hypertension. We hypothesized that fructose-enriched diets enhance the ability of low concentrations of Ang II to stimulate PT transport. We measured the effects of a low concentration of Ang II (10(-12) mol/L) on transport-related oxygen consumption (QO₂), and Na/K-ATPase and Na/H-exchange (NHE) activities and expression in PTs from rats consuming tap water (Control) or 20% fructose (FRUC)...
August 16, 2017: Nutrients
https://www.readbyqxmd.com/read/28813002/application-of-surfactant-micelle-entrapped-eugenol-for-prevention-of-growth-of-the-shiga-toxin-producing-escherichia-coli-in-ground-beef
#7
Tamra N Tolen, Songsirin Ruengvisesh, Thomas M Taylor
Beef safety may be compromised by O157 and non-O157 Shiga toxin-producing Escherichia coli (STEC) contamination. The capacity of surfactant micelles loaded with the plant-derived antimicrobial eugenol to reduce STEC on beef trimmings that were later ground and refrigerated for five days at 5 ± 1 °C was tested to determine their utility for beef safety protection. STEC-inoculated trimmings were treated with free eugenol, micelle-encapsulated eugenol, 2% lactic acid (55 °C), sterile distilled water (25 °C), or left untreated (control)...
August 16, 2017: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28812987/a-microneedle-functionalized-with-polyethyleneimine-and-nanotubes-for-highly-sensitive-label-free-quantification-of-dna
#8
Darius Saadat-Moghaddam, Jong-Hoon Kim
The accurate measure of DNA concentration is necessary for many DNA-based biological applications. However, the current methods are limited in terms of sensitivity, reproducibility, human error, and contamination. Here, we present a microneedle functionalized with polyethyleneimine (PEI) and single-walled carbon nanotubes (SWCNTs) for the highly sensitive quantification of DNA. The microneedle was fabricated using ultraviolet (UV) lithography and anisotropic etching, and then functionalized with PEI and SWCNTs through a dip coating process...
August 16, 2017: Sensors
https://www.readbyqxmd.com/read/28812908/a-quantitative-assessment-of-the-risk-of-human-salmonellosis-arising-from-the-consumption-of-pecans-in-the-united-states
#9
Sofia M Santillana Farakos, Régis Pouillot, Rhoma Johnson, Judith Spungen, Insook Son, Nathan Anderson, Gordon R Davidson, Jane M Van Doren
A quantitative risk assessment was conducted to assess the risk of human salmonellosis acquired from consumption of pecans in the United States. The model considered the potential for Salmonella survival, growth, and recontamination of pecans from the sheller to the consumer, including steps such as immersion in water, drying, conditioning, cracking, partitioning, and storage. Five theoretical microbial reduction treatment levels (1 to 5 log CFU) were modeled. Data from the 2010 to 2013 surveys by the National Pecan Shellers Association were used for initial prevalence and contamination levels...
August 16, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28812902/charge-effects-on-the-efflorescence-in-single-levitated-droplets
#10
Gunter Hermann, Yan Zhang, Bernhard Wassermann, Henry Fischer, Marcel Quennet, Eckart Ruehl
The influence of electrical excess charges on the crystallization from supersaturated aqueous sodium chloride solutions is reported. This is accomplished by efflorescence studies on single levitated microdroplets using optical and electrodynamic levitation. Specifically, a strong increase in efflorescence humidity is observed as a function of the droplet's negative excess charge, ranging up to -2.1 pC, with a distinct threshold behavior, increasing the relative efflorescence humidity, at which spontaneous nucleation occurs, from 44% for the neutral microparticle to 60%...
August 16, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28812872/effect-of-mineral-dissolution-precipitation-and-co2-exsolution-on-co2-transport-in-geological-carbon-storage
#11
Ruina Xu, Rong Li, Jin Ma, Di He, Peixue Jiang
Geological carbon sequestration (GCS) in deep saline aquifers is an effective means for storing carbon dioxide to address global climate change. As the time after injection increases, the safety of storage increases as the CO2 transforms from a separate phase to CO2(aq) and HCO3(-) by dissolution and then to carbonates by mineral dissolution. However, subsequent depressurization could lead to dissolved CO2(aq) escaping from the formation water and creating a new separate phase which may reduce the GCS system safety...
August 16, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28812870/antifouling-thermoplastic-composites-with-maleimide-encapsulated-in-clay-nanotubes
#12
Ye Fu, Congcong Gong, Wencai Wang, Liqun Zhang, Evgenii Ivanov, Yuri M Lvov
An antifouling ethylene-vinyl acetate copolymer (EVA) with halloysite clay nanotubes loaded with maleimide (TCPM) is prepared. Such encapsulation allowed for extended release of TCPM and a long-lasting, efficient protection of the coated surface against marine microorganisms proliferation. Halloysite also induces the composite's anisotropy due to parallel alignment of the nanotubes. The maleimide loaded halloysite incorporated into the polymer matrix allowed for 12-month release of the bacterial inhibitor preventing fouling; it is much longer than the 2-3 month protection when TCPM is directly admixed into EVA...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812766/modulatory-effects-of-arginine-glutamine-and-branched-chain-amino-acids-on-heat-shock-proteins-immunity-and-antioxidant-response-in-exercised-rats
#13
Carolina Soares Moura, Pablo Christiano Barboza Lollo, Priscila Neder Morato, Eder Muller Risso, Jaime Amaya-Farfan
Heat shock proteins (HSPs) are endogenous proteins whose function is to maintain the cell's tolerance to insult, and glutamine supplementation is known to increase HSP expression during intense exercise. Since few studies have addressed the possibility that supplementation with other amino acids could have similar effects to that of glutamine, our objective was to evaluate the effects of leucine, valine, isoleucine and arginine as potential stimulators of HSPs 25, 60, 70 and 90 in rats subjected to acute exercise as a stressing factor...
August 16, 2017: Food & Function
https://www.readbyqxmd.com/read/28812763/enhancing-the-solubility-and-bioactivity-of-anticancer-drug-tamoxifen-by-water-soluble-pillar-6-arene-based-host-guest-complexation
#14
Liqing Shangguan, Qi Chen, Bingbing Shi, Feihe Huang
A water-soluble pillar[6]arene functions as a solubilizing agent to enhance the solubility and bioactivity of poorly water-soluble anticancer drug tamoxifen by host-guest complexation between it and tamoxifen.
August 16, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28812746/redox-titration-of-gold-and-platinum-surface-oxides-at-porous-microelectrodes
#15
Mareike Haensch, Julian Behnken, Luis Balboa, Alexander Dyck, Gunther Wittstock
The extension of the surface interrogation mode of scanning electrochemical microscopy (SI-SECM) is demonstrated for porous electrode materials. These materials are often high surface area powders which are very important electrocatalysts for instance in fuel cells or water electrolyzers. The powdered electrocatalyst material is filled into a cavity-microelectrode which is then operated as the sample electrode in SECM. After a surface oxide generation step, the oxides on the porous sample are reduced by [Ru(NH3)6](2+) formed at the microelectrode probe of the SECM while the sample is at open circuit potential...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28812744/benzene-centred-tripodal-diglycolamides-for-the-sequestration-of-trivalent-actinides-metal-ion-extraction-and-luminescence-spectroscopic-investigations-in-a-room-temperature-ionic-liquid
#16
Seraj Ahmad Ansari, Prasanta Kumar Mohapatra, Andrea Leoncini, Jurriaan Huskens, Willem Verboom
Three benzene-centred tripodal diglycolamide (Bz-T-DGA) ligands, where the diglycolamide (DGA) moieties are attached to a central benzene ring through ethylene spacers (LI), amide groups (LII) or ether linkages (LIII), were evaluated for their extraction behaviour towards trivalent actinide and lanthanide ions in a room temperature ionic liquid (RTIL), viz. 1-butyl-3-methylimidazolium bis(trifluoromethane)sulfonimide ([C4mim][Tf2N]). The extraction behaviour of these ligands in [C4mim][Tf2N] medium was compared with that obtained in the molecular solvent n-dodecane showing an opposite selectivity of LIII > LII > LIvs...
August 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28812709/adaptation-to-deep-sea-chemosynthetic-environments-as-revealed-by-mussel-genomes
#17
Jin Sun, Yu Zhang, Ting Xu, Yang Zhang, Huawei Mu, Yanjie Zhang, Yi Lan, Christopher J Fields, Jerome Ho Lam Hui, Weipeng Zhang, Runsheng Li, Wenyan Nong, Fiona Ka Man Cheung, Jian-Wen Qiu, Pei-Yuan Qian
Hydrothermal vents and methane seeps are extreme deep-sea ecosystems that support dense populations of specialized macro-benthos such as mussels. But the lack of genome information hinders the understanding of the adaptation of these animals to such inhospitable environments. Here we report the genomes of a deep-sea vent/seep mussel (Bathymodiolus platifrons) and a shallow-water mussel (Modiolus philippinarum). Phylogenetic analysis shows that these mussel species diverged approximately 110.4 million years ago...
April 3, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812671/sulfate-radicals-enable-a-non-enzymatic-krebs-cycle-precursor
#18
Markus A Keller, Domen Kampjut, Stuart A Harrison, Markus Ralser
The evolutionary origins of the Krebs cycle (tricarboxylic acid cycle) are not currently clear. Despite the existence of a simple non-enzymatic Krebs cycle catalyst being dismissed only a few years ago as 'an appeal to magic', citrate and other intermediates have since been discovered on a carbonaceous meteorite and do interconvert non-enzymatically. To identify a metabolism-like non-enzymatic Krebs cycle catalyst, we used combinatorial, quantitative high-throughput metabolomics to systematically screen iron and sulfate compounds in a reaction mixture that orients on the typical components of Archaean sediment...
March 13, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812604/stand-age-and-species-richness-dampen-interannual-variation-of-ecosystem-level-photosynthetic-capacity
#19
Talie Musavi, Mirco Migliavacca, Markus Reichstein, Jens Kattge, Christian Wirth, T Andrew Black, Ivan Janssens, Alexander Knohl, Denis Loustau, Olivier Roupsard, Andrej Varlagin, Serge Rambal, Alessandro Cescatti, Damiano Gianelle, Hiroaki Kondo, Rijan Tamrakar, Miguel D Mahecha
The total uptake of carbon dioxide by ecosystems via photosynthesis (gross primary productivity, GPP) is the largest flux in the global carbon cycle. A key ecosystem functional property determining GPP is the photosynthetic capacity at light saturation (GPPsat), and its interannual variability (IAV) is propagated to the net land-atmosphere exchange of CO2. Given the importance of understanding the IAV in CO2 fluxes for improving the predictability of the global carbon cycle, we have tested a range of alternative hypotheses to identify potential drivers of the magnitude of IAV in GPPsat in forest ecosystems...
January 23, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812539/investigating-ebola-virus-pathogenicity-using-molecular-dynamics
#20
Morena Pappalardo, Francesca Collu, James Macpherson, Martin Michaelis, Franca Fraternali, Mark N Wass
BACKGROUND: Ebolaviruses have been known to cause deadly disease in humans for 40 years and have recently been demonstrated in West Africa to be able to cause large outbreaks. Four Ebolavirus species cause severe disease associated with high mortality in humans. Reston viruses are the only Ebolaviruses that do not cause disease in humans. Conserved amino acid changes in the Reston virus protein VP24 compared to VP24 of other Ebolaviruses have been suggested to alter VP24 binding to host cell karyopherins resulting in impaired inhibition of interferon signalling, which may explain the difference in human pathogenicity...
August 11, 2017: BMC Genomics
keyword
keyword
9
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"