keyword
MENU ▼
Read by QxMD icon Read
search

Temperature

keyword
https://www.readbyqxmd.com/read/29166686/-bone-cement-adhesion-on-ceramic-surfaces-deactivation-of-surfaces-and-as-a-consequence-inefficient-retention-of-knee-prostheses-because-of-adsorption-of-atmospheric-water
#1
Bernd Marx, Philip Kerschbaum, Stephanie Lindlahr, Rudolf Marx, Uwe Reisgen, Dieter Christian Wirtz
Aim CoCrMo alloys are contraindicated for sufferers from allergy. For these patients, uncemented and cemented prostheses made of non-allergenic titanium alloy are indicated. Knee prostheses machined from that alloy, however, may have poor tribological behaviour, especially in contact to UHMWPE inlays. Therefore, high-strength oxide ceramics may be especially suitable for knee replacement in allergy patients with mobile bearing prostheses. For adhesion to bone cement, the ceramic surface only exhibits mechanical retention spots that are less adequate than those with a textured metal surface...
November 22, 2017: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/29166641/agrowastes-as-feedstock-for-the-production-of-endo-%C3%AE-xylanase-from-cohnella-sp-strain-ar92
#2
José H Pisa, Adriana P Manfredi, Nora I Perotti, Héctor G Romero, Javier D Breccia, María Alejandra Martínez
Members of Cohnella sp. isolated from a variety of environments have been shown to be glycoside hydrolase producers. Nevertheless, most evaluations of members of this genus are limited to their taxonomic description. The strain AR92, previously identified as belonging to the genus Cohnella, formed a well-supported cluster with C. thailandensis and C. formosensis (>80% bootstrap confidence). Its growth and xylanase production were approached by using a mineral-based medium containing alkali-pretreated sugarcane bagasse as the main carbon source, which was assayed as a convenient source to produce biocatalysts potentially fitting its degradation...
November 23, 2017: Journal of Molecular Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29166573/interaction-of-hsp90-with-phospholipid-model-membranes
#3
Muhan Zhang, Daoying Wang, Pengpeng Li, Chong Sun, Rong Xu, Zhiming Geng, Weimin Xu, Zhaoqi Dai
Heat shock protein 90 (Hsp90) is an essential molecular chaperone with versatile functions in cell homeostatic control under both normal and stress conditions. Hsp90 has been found to be expressed on the cell surface, but the mechanism of Hsp90 association to the membrane remains obscure. In this study, the direct interaction of Hsp90 and phospholipid vesicles was characterized, and the role of Hsp90 on membrane physical state was explored. Using surface plasmon resonance (SPR), we observed a strong interaction between Hsp90 and different compositions of lipid...
November 19, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29166563/mechanochemical-synthesis-of-pharmaceutical-cocrystal-suspensions-via-hot-melt-extrusion-enhancing-cocrystal-yield
#4
Shu Li, Tao Yu, Yiwei Tian, Colette Lagan, David S Jones, Gavin P Andrews
Pharmaceutical cocrystals have attracted increasing attention over the past decade as an alternative way to modify the physicochemical properties and hence improve the bioavailability of a drug, without sacrificing thermodynamic stability. Our previous work has demonstrated the viability of in-situ formation of ibuprofen/isonicotinamide cocrystal suspensions within a matrix carrier via a single-step hot-melt extrusion (HME) process. The key aim of the current work is to establish optimised processing conditions to improve cocrystal yield within extruded matrices...
November 22, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29166540/statistical-optimization-of-an-rp-hplc-method-for-the-determination-of-selected-flavonoids-in-berry-juices-and-evaluation-of-their-antioxidant-activities
#5
Andrija Ciric, Milena Jelikic-Stankov, Milica Cvijovic, Predrag Djurdjevic
An isocratic RP-HPLC method for the separation and identification of selected flavonoids (quercetin, rutin, luteolin-7-O-glucoside, kaempferol, and kaempferol-3-O-glucoside) in commercial berries juices (blackcurrant, blueberry, red raspberry and cherry) was developed with the aid of central composite design and response surface methodology. The optimal separation conditions were a mobile phase of 85:15 (% v/v) water/acetonitrile, pH of 2.8 (adjusted with formic acid), flow rate 0.5 mL/min and column temperature of 35 °C...
November 22, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29166439/the-geographic-information-system-applied-to-study-schistosomiasis-in-pernambuco
#6
Verônica Santos Barbosa, Rodrigo Moraes Loyo, Ricardo José de Paula Souza E Guimarães, Constança Simões Barbosa
OBJECTIVE: Diagnose risk environments for schistosomiasis in coastal localities of Pernambuco using geoprocessing techniques. METHODS: A coproscopic and malacological survey were carried out in the Forte Orange and Serrambi areas. Environmental variables (temperature, salinity, pH, total dissolved solids and water fecal coliform dosage) were collected from Biomphalaria breeding sites or foci. The spatial analysis was performed using ArcGis 10.1 software, applying the kernel estimator, elevation map, and distance map...
2017: Revista de Saúde Pública
https://www.readbyqxmd.com/read/29166382/human-milk-h2o2-content-does-it-benefit-preterm-infants
#7
Monika Cieslak, Cristina H F Ferreira, Yulia Shifrin, Jingyi Pan, Jaques Belik
BACKGROUND: Human milk has a high content of the antimicrobial compound hydrogen peroxide (H2O2). As opposed to healthy full-term infants, preterm neonates are fed previously expressed and stored maternal milk. These practices may favor H2O2 decomposition, thus limiting its potential benefit to preterm infants. The goal of this study was to evaluate the factors responsible for H2O2 generation and degradation in breastmilk. METHODS: Human donors' and rat milk, along with rat mammary tissue were evaluated...
November 22, 2017: Pediatric Research
https://www.readbyqxmd.com/read/29166264/relationship-between-ph-of-ruminal-fluid-during-subacute-ruminal-acidosis-and-physiological-response-of-the-polish-holstein-friesian-dairy-cows
#8
B Stefańska, E Pruszyńska-Oszmałek, D Szczepankiewicz, K Stajek, P Stefański, M Gehrke, W Nowak
The aim of the study was to investigate the effect of ruminal fluid pH depression on biochemical indices of blood, urine, feces, and milk, and to determine which of them may be helpful as a marker for the diagnosis of subacute ruminal acidosis (SARA). Ruminal fluid samples were obtained by rumenocentesis from 305 cows representing 13 commercial dairy herds. The herds were selected based on percentages of cows with an assigned value of ruminal fluid pH segregated into three groups as: SARA-positive herd, if at least 25% of the ruminal fluid samples indicated a pH < 5...
September 26, 2017: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/29166199/differences-in-temperature-changes-in-premature-infants-during-invasive-procedures-in-incubators-and-radiant-warmers
#9
Ludwy Handhayanti, Yeni Rustina, Tri Budiati
Premature infants tend to lose heat quickly. This loss can be aggravated when they have received an invasive procedure involving a venous puncture. This research uses crossover design by conducting 2 intervention tests to compare 2 different treatments on the same sample. This research involved 2 groups with 18 premature infants in each. The process of data analysis used a statistical independent t test. Interventions conducted in an open incubator showed a p value of .001 which statistically related to heat loss in premature infants...
2017: Compr Child Adolesc Nurs
https://www.readbyqxmd.com/read/29166198/heat-loss-prevention-education-aids-nurses-knowledge-in-prevention-of-hypothermia-in-newborns
#10
Meivita Dewi Purnamasari, Yeni Rustina, Fajar Tri Waluyanti
Newborns are at risk of developing hypothermia due to the instability of their thermoregulation systems and inability to adjust to changes in ambient temperature. This risk increases during hospitalization. Education is a strategy to improve nurses' understanding of the prevention of hypothermia in newborns in the hospital. This study aimed to analyze the impact of education about preventing heat loss on nurses' knowledge and behavior in preventing hypothermia in newborns. The study design was a quasi-experiment with one group pre-test-post-test and a total sample of 21 neonatal nurses who were selected using the consecutive sampling method...
2017: Compr Child Adolesc Nurs
https://www.readbyqxmd.com/read/29166177/kinetic-behavior-of-campylobacter-jejuni-in-beef-tartare-at-cold-temperatures-and-transcriptomes-related-to-its-survival
#11
Sejeong Kim, Jiyeon Jeong, Heeyoung Lee, Jeeyeon Lee, Soomin Lee, Jimyeong Ha, Yukyoung Choi, Yohan Yoon, Kyoung-Hee Choi
This study was conducted to examine the kinetic behavior of Campylobacter jejuni in raw beef tartare by using mathematical models and to identify genes related to C. jejuni survival at cold temperatures. C. jejuni was inoculated onto beef tartare samples, stored at 4, 10, 15, 25, and 30°C, plated on modified charcoal-cefoperazone-deoxycholate agar, and enumerated. The survival data was fitted to the Weibull model to calculate delta (δ), which is the time required for the first 1-log reduction of the cells...
November 22, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/29166165/the-rate-of-seasonal-changes-in-temperature-alters-acclimation-of-performance-under-climate-change
#12
Viktor Nilsson-Örtman, Frank Johansson
How the ability to acclimate will impact individual performance and ecological interactions under climate change remains poorly understood. Theory predicts that the benefit an organism can gain from acclimating depends on the rate at which temperatures change relative to the time it takes to induce beneficial acclimation. Here, we present a conceptual model showing how slower seasonal changes under climate change can alter species' relative performance when they differ in acclimation rate and magnitude. To test predictions from theory, we performed a microcosm experiment where we reared a mid- and a high-latitude damselfly species alone or together under the rapid seasonality currently experienced at 62°N and the slower seasonality predicted for this latitude under climate change and measured larval growth and survival...
December 2017: American Naturalist
https://www.readbyqxmd.com/read/29166161/will-invertebrates-require-increasingly-carbon-rich-food-in-a-warming-world
#13
Thomas R Anderson, Dag O Hessen, Maarten Boersma, Jotaro Urabe, Daniel J Mayor
Elevated temperature causes metabolism and respiration to increase in poikilothermic organisms. We hypothesized that invertebrate consumers will therefore require increasingly carbon-rich diets in a warming environment because the increased energetic demands are primarily met using compounds rich in carbon, that is, carbohydrates and lipids. Here, we test this hypothesis using a new stoichiometric model that has carbon (C) and nitrogen (N) as currencies. Model predictions did not support the hypothesis, indicating instead that the nutritional requirements of invertebrates, at least in terms of food quality expressed as C∶N ratio, may change little, if at all, at elevated temperature...
December 2017: American Naturalist
https://www.readbyqxmd.com/read/29166123/tunneling-of-coupled-methyl-quantum-rotors-in-4-methylpyridine-single-rotor-potential-versus-coupling-interaction
#14
Somayeh Khazaei, Daniel Sebastiani
We study the influence of rotational coupling between a pair of methyl rotators on the tunneling spectrum in condensed phase. Two interacting adjacent methyl groups are simulated within a coupled-pair model composed of static rotational potential created by the chemical environment and the interaction potential between two methyl groups. We solve the two-dimensional time-independent Schrödinger equation analytically by expanding the wave functions on the basis set of two independent free-rotor functions. We investigate three scenarios which differ with respect to the relative strength of single-rotor and coupling potential...
November 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29166121/photoinduced-transformations-of-indole-and-3-formylindole-monomers-isolated-in-low-temperature-matrices
#15
Igor Reva, Leszek Lapinski, A J Lopes Jesus, Maciej J Nowak
Photochemical transformations were studied for monomers of indole and 3-formylindole isolated in low-temperature noble-gas matrices. Upon UV (λ > 270 nm) irradiation of indole trapped in argon and neon matrices, the initial 1H-form of the compound converted into the 3H-tautomer. Alongside this photoinduced hydrogen-atom transfer, an indolyl radical was also generated by photodetachment of the hydrogen atom from the N1-H bond. Excitation of 3-formylindole isolated in an argon matrix with UV (λ > 335 nm) light led to interconversion between the two conformers of the 1H-tautomer, differing from each other in the orientation of the formyl group (cis or trans)...
November 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29166109/temperature-and-chain-length-dependence-of-ultrafast-vibrational-dynamics-of-thiocyanate-in-alkylimidazolium-ionic-liquids-a-random-walk-on-a-rugged-energy-landscape
#16
Thomas Brinzer, Sean Garrett-Roe
Ultrafast two-dimensional infrared spectroscopy of a thiocyanate vibrational probe (SCN(-)) was used to investigate local dynamics in alkylimidazolium bis-[trifluoromethylsulfonyl]imide ionic liquids ([Imn,1][Tf2N], n = 2, 4, 6) at temperatures from 5 to 80 °C. The rate of frequency fluctuations reported by SCN(-) increases with increasing temperature and decreasing alkyl chain length. Temperature-dependent correlation times scale proportionally to temperature-dependent bulk viscosities of each ionic liquid studied...
November 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29166107/simulations-of-water-nano-confined-between-corrugated-planes
#17
Jon Zubeltzu, Emilio Artacho
Water confined to nanoscale widths in two dimensions between ideal planar walls has been the subject of ample study, aiming at understanding the intrinsic response of water to confinement, avoiding the consideration of the chemistry of actual confining materials. In this work, we study the response of such nanoconfined water to the imposition of a periodicity in the confinement by means of computer simulations, both using empirical potentials and from first-principles. For that we propose a periodic confining potential emulating the atomistic oscillation of the confining walls, which allows varying the lattice parameter and amplitude of the oscillation...
November 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29166105/electrode-reactions-in-slowly-relaxing-media
#18
Dmitry V Matyushov, Marshall D Newton
Standard models of reaction kinetics in condensed materials rely on the Boltzmann-Gibbs distribution for the population of reactants at the top of the free energy barrier separating them from the products. While energy dissipation and quantum effects at the barrier top can potentially affect the transmission coefficient entering the rate pre-exponential factor, much stronger dynamical effects on the reaction barrier are caused by the breakdown of ergodicity for populating the reaction barrier (violation of the Boltzmann-Gibbs statistics)...
November 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29166100/modifying-hydrogen-bonded-structures-by-physical-vapor-deposition-4-methyl-3-heptanol
#19
A R Young-Gonzales, A Guiseppi-Elie, M D Ediger, R Richert
We prepared films of 4-methyl-3-heptanol by vapor depositing onto substrates held at temperatures between Tdep = 0.6Tg and Tg, where Tg is the glass transition temperature. Using deposition rates between 0.9 and 6.0 nm/s, we prepared films about 5 μm thick and measured the dielectric properties via an interdigitated electrode cell onto which films were deposited. Samples prepared at Tdep = Tg display the dielectric behavior of the ordinary supercooled liquid. Films deposited at lower deposition temperatures show a high dielectric loss upon heating toward Tg, which decreases by a factor of about 12 by annealing at Tg = 162 K...
November 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29166097/volatility-of-the-catalytic-hydrogenation-products-of-1-4-bis-phenylethynyl-benzene
#20
Hom N Sharma, Elizabeth A Sangalang, Cheng K Saw, Gareth A Cairns, William McLean, Robert S Maxwell, Long N Dinh
Measurements of equilibrium vapor pressures by effusion thermogravimetry and melting points by differential scanning calorimetry reveal that the melting temperature and equilibrium vapor pressures of 1,4-bis(phenylethynyl)benzene (DEB) do not vary monotonically with the hydrogenation extent. Contrary to intuition which suggests increasing volatility with hydrogenation, results indicate decreasing volatility for the first two hydrogenation steps before a non-monotonic upward trend, in which trans-isomers are less volatile...
November 21, 2017: Journal of Chemical Physics
keyword
keyword
689
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"