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https://www.readbyqxmd.com/read/29141146/the-effect-of-pressure-and-temperature-on-mid-infrared-sensing-of-dissolved-hydrocarbons-in-water
#1
Charles Heath, Matthew B Myers, Bobby Pejcic
Attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy using a polymer coated internal reflection element/waveguide is an established sensor platform for the detection of a range of organic and hydrocarbon molecules dissolved in water. The polymer coating serves two purposes: to concentrate hydrocarbons from the aqueous phase and to exclude water along with other interfering molecules from the surface of the internal reflection element. Crucial to reliable quantification and analytical performance is the calibration of the ATR-FTIR sensor which is commonly performed in water under mild ambient conditions (i...
November 15, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29141045/csf-in-the-ventricles-of-the-brain-behaves-as-a-relay-medium-for-arteriovenous-pulse-wave-phase-coupling
#2
William E Butler, Pankaj K Agarwalla, Patrick Codd
The ventricles of the brain remain perhaps the largest anatomic structure in the human body without established primary purpose, even though their existence has been known at least since described by Aristotle. We hypothesize that the ventricles help match a stroke volume of arterial blood that arrives into the rigid cranium with an equivalent volume of ejected venous blood by spatially configuring cerebrospinal fluid (CSF) to act as a low viscosity relay medium for arteriovenous pulse wave (PW) phase coupling...
2017: PloS One
https://www.readbyqxmd.com/read/29140091/evidence-for-symmetry-reduction-in-ti3-al1-%C3%AE-cu%C3%AE-c2-max-phase-solid-solutions
#3
Mustapha Nechiche, Thierry Cabioc'h, Elad N Caspi, Oleg Rivin, Andreas Hoser, Véronique Gauthier-Brunet, Patrick Chartier, Sylvain Dubois
Ti3[Al1-δCuδ]C2 MAX phase solid solutions have been synthesized by sintering compacted Ti3AlC2-Cu composites produced by mechanical milling. Using X-ray and neutron diffraction techniques, it is demonstrated that the Cu mixing into the Al site is accompanied by lattice distortion, which leads to symmetry reduction from a hexagonal to a monoclinic structure. Such symmetry reduction likely results from this mixing through deviation of the A-site position from the special (0, 0, (1)/4) position within the P63/mmc space group of the original Ti3AlC2 structure...
November 15, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29139305/development-of-optimized-self-nanoemulsifying-lyophilized-tablets-snelts-to-improve-finasteride-clinical-pharmacokinetic-behavior
#4
Tarek A Ahmed, Khalid M El-Say, Khaled M Hosny, Bader M Aljaeid
OBJECTIVE: Preparation of an optimized finasteride (FSD) lyophilized tablets loaded with self-nanoemulsifying drug delivery system (SNEDDS). SIGNIFICANCE: Enhance FSD bioavailability in male pattern baldness and benign prostatic hyperplasia. METHODS: Two-step optimization was implemented to achieve the study goals. First; mixture design was used to develop an optimized SNEDDS through which the effect of cosurfactant number of carbon atoms on SNEDDS particle size and thermodynamic stability has been tested...
November 15, 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/29138511/intrinsic-and-extrinsic-factors-drive-ontogeny-of-early-life-at-sea-behaviour-in-a-marine-top-predator
#5
Matt I D Carter, Deborah J F Russell, Clare B Embling, Clint J Blight, David Thompson, Philip J Hosegood, Kimberley A Bennett
Young animals must learn to forage effectively to survive the transition from parental provisioning to independent feeding. Rapid development of successful foraging strategies is particularly important for capital breeders that do not receive parental guidance after weaning. The intrinsic and extrinsic drivers of variation in ontogeny of foraging are poorly understood for many species. Grey seals (Halichoerus grypus) are typical capital breeders; pups are abandoned on the natal site after a brief suckling phase, and must develop foraging skills without external input...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29137887/effects-of-chlortetracycline-on-the-fate-of-multi-antibiotic-resistance-genes-and-the-microbial-community-during-swine-manure-composting
#6
Zhiqiang Chen, Yao Wang, Qinxue Wen
Excessive use of antibiotics in breeding industry leads to accumulation of antibiotic residuals and antibiotic resistance genes (ARGs) in environment from improperly treated livestock excrements. Four commonly used veterinary antibiotics including chlortetracycline (CTC), sulfamerazine (SMZ), enrofloxacin (ENR) and erythromycin (ERY) were monitored in the swine manure composting. Co-resistance and cross-resistance effects among relative ARGs, correlations between ARGs and bacterial community under multiple antibiotics residual during the composting were investigated in this research...
November 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29137842/comparison-of-pharmacokinetics-of-newly-discovered-aromatase-inhibitors-by-a-cassette-microdosing-approach-in-healthy-japanese-subjects
#7
Hiroyuki Kusuhara, Tadayuki Takashima, Hisako Fujii, Tsutomu Takashima, Masaaki Tanaka, Akira Ishii, Shusaku Tazawa, Kazuhiro Takahashi, Kayo Takahashi, Hidekichi Tokai, Tsuneo Yano, Makoto Kataoka, Akihiro Inano, Suguru Yoshida, Takamitsu Hosoya, Yuichi Sugiyama, Shinji Yamashita, Taisuke Hojo, Yasuyoshi Watanabe
The aim of the present study is to investigate the pharmacokinetics of our newly developed aromatase inhibitors (cetrozole and TMD-322) in healthy subjects by a cassette microdose strategy. A cocktail of cetrozole and TMD-322 was administered intravenously or orally (1.98 μg for each drug) to six healthy volunteers in a crossover fashion. Anastrozole (1.98 μg) was also included in the oral cocktail. Total body clearance and bioavailability were 12.1 ± 7.1 mL/min/kg and 34.9 ± 32.3% for cetrozole, and 16...
September 21, 2017: Drug Metabolism and Pharmacokinetics
https://www.readbyqxmd.com/read/29137774/influence-of-reactions-heats-on-variation-of-radius-temperature-pressure-and-chemical-species-amounts-within-a-single-acoustic-cavitation-bubble
#8
Kaouther Kerboua, Oualid Hamdaoui
The scientific interest toward the study of acoustic bubble is mainly explained by its practical benefit in providing a reactional media favorable to the rapid evolution of chemical mechanism. The evolution of this mechanism is related to the simultaneous and dependent variation of the volume, temperature and pressure within the bubble, retrieved by the resolution of a differential equations system, including among others the thermal balance. This last one is subject to different assumptions, some authors deem simply that the temperature varies adiabatically during the collapsing phase, without considering the reactions heat of the studied mechanism...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137593/central-pontine-myelinolysis-after-living-donor-liver-transplant-a-report-of-2-cases
#9
Ya-Lan Hsu, Chia-En Hsieh, Kuo-Hua Lin, Chen-Te Chou, Ping-Yi Lin, Su-Han Wang, Yao-Li Chen
Here, we present 2 patients who developed central pontine myelinolysis after living-donor liver transplant. Both patients had abnormal sodium level before living-donor liver transplant. Patient 1 presented with severe hyponatremia on admission. After administration of 3% saline, her sodium level during the first 24 hours was kept at 100 mEq/L and then increased to 116 mEq/L during the next 24 hours. The level increased 5.8 mEq/L during the 4- to 5-hour transplant procedure. Patient 2 was admitted to the hospital with an unprovoked seizure...
November 15, 2017: Experimental and Clinical Transplantation
https://www.readbyqxmd.com/read/29136855/molecularly-imprinted-polymer-mip-membrane-assisted-direct-spray-ionization-mass-spectrometry-for-agrochemicals-screening-in-foodstuffs
#10
Igor Pereira, Marcella Ferreira Rodrigues, Andréa Rodrigues Chaves, Boniek Gontijo Vaz
Paper spray ionization (PSI) has some limitations such as low sensitivity and ionization suppression when complex samples are analyzed. The use of sample preparation devices directly coupled to MS can avoid these restrictions. Molecularly imprinted polymers (MIPs) are materials widely used as adsorbent in sample preparation methods such as solid-phase extraction and solid-phase microextraction, and they can provide specifics cavities with affinity to a target molecule. Here, we introduce a new MIP membrane spray ionization method combining MIP and PSI...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136817/rapid-quantification-of-persulfate-in-aqueous-systems-using-a-modified-hplc-unit
#11
Abbas Baalbaki, Nagham Zein Eddine, Saly Jaber, Maya Amasha, Antoine Ghauch
Existing analytical techniques used for the quantification of persulfate (PS) in water mostly rely on polarography, reductometry or spectrophotometry. Although acceptable to a certain extent, these methods did not satisfy environmental chemists seeking rapid, reproducible and accurate quantification of PS upon the application of ISCO and AOPs technologies. Accordingly, a novel flow injection/spectroscopy analytical technique is developed via the use of an HPLC coupled to bypass capillary columns and a DAD detector...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136548/wavelet-coherence-analysis-a-new-approach-to-distinguish-organic-and-functional-tremor-types
#12
G Kramer, A M M Van der Stouwe, N M Maurits, M A J Tijssen, J W J Elting
OBJECTIVE: To distinguish tremor subtypes using wavelet coherence analysis (WCA). WCA enables to detect variations in coherence and phase difference between two signals over time and might be especially useful in distinguishing functional from organic tremor. METHODS: In this pilot study, polymyography recordings were studied retrospectively of 26 Parkinsonian (PT), 26 functional (FT), 26 essential (ET), and 20 enhanced physiological (EPT) tremor patients. Per patient one segment of 20 s in duration, in which tremor was present continuously in the same posture, was selected...
October 14, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29136282/principal-component-reconstruction-pcr-for-cine-cbct-with-motion-learning-from-2d-fluoroscopy
#13
Hao Gao, Yawei Zhang, Lei Ren, Fang-Fang Yin
PURPOSE: This work aims to generate cine CT images (i.e., 4D images with high temporal resolution) based on a novel principal component reconstruction (PCR) technique with motion learning from 2D fluoroscopic training images. METHODS: In the proposed PCR method, the matrix factorization is utilized as an explicit low-rank regularization of 4D images that are represented as a product of spatial principal components and temporal motion coefficients. The key hypothesis of PCR is that temporal coefficients from 4D images can be reasonably approximated by temporal coefficients learned from 2D fluoroscopic training projections...
November 14, 2017: Medical Physics
https://www.readbyqxmd.com/read/29136206/calculation-consequences-and-measurement-of-the-point-spread-function-for-low-loss-inelastic-scattering
#14
R F Egerton
We have previously derived an analytical formula for the point spread function (PSF) that describes the delocalization of low-loss inelastic scattering. Here, we modify the formula to take account variation of scattered-electron phase. The exponentially attenuated Lorentzian form is retained but its halfwidth at half maximum is chosen to provide better agreement with measurements of the median delocalization distance. For low energy losses, the 1/r2 tails of the PSF extend beyond the region of energy deposition, allowing a small-diameter electron probe to provide energy-loss data from relatively undamaged regions of a beam-sensitive specimen...
November 9, 2017: Microscopy
https://www.readbyqxmd.com/read/29136143/time-varying-cycle-average-and-daily-variation-in-ambient-air-pollution-and-fecundability
#15
Carrie J Nobles, Enrique F Schisterman, Sandie Ha, Germaine M Buck Louis, Seth Sherman, Pauline Mendola
STUDY QUESTION: Does ambient air pollution affect fecundability? SUMMARY ANSWER: While cycle-average air pollution exposure was not associated with fecundability, we observed some associations for acute exposure around ovulation and implantation with fecundability. WHAT IS KNOWN ALREADY: Ambient air pollution exposure has been associated with adverse pregnancy outcomes and decrements in semen quality. STUDY DESIGN, SIZE, DURATION: The LIFE study (2005-2009), a prospective time-to-pregnancy study, enrolled 501 couples who were followed for up to one year of attempting pregnancy...
November 10, 2017: Human Reproduction
https://www.readbyqxmd.com/read/29134801/adsorbed-polyzwitterion-copolymer-layers-designed-for-protein-repellency-and-interfacial-retention
#16
S Kalasin, R A Letteri, T Emrick, M M Santore
Poly(2-methacryloyloxyethyl phosphorylcholine) (pMPC), when end-tethered to surfaces by the adsorption of copolymeric cationic segments, forms adsorbed layers that substantially reduce protein adsorption. This study examined variations in the molecular architecture of copolymers containing cationic poly(trimethylammonium ethyl methacrylate (pTMAEMA) anchor blocks that adsorbed strongly to negative surfaces. With appropriate copolymer design, the pTMAEMA blocks were shielded, by pMPC tethers, from solution-phase proteins...
November 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29134782/determination-of-the-clean-up-efficiency-of-the-solid-phase-extraction-of-rosemary-extracts-application-of-full-factorial-design-in-hyphenation-with-gaussian-peak-fit-function
#17
Florian Meischl, Christian G Kirchler, Michael A Jäger, Christian W Huck, Matthias Rainer
We present a novel method for the quantitative determination of the clean-up efficiency to provide a calculated parameter for peak purity through iterative fitting in conjunction with design of experiments. Rosemary extracts were used and analyzed before and after solid-phase extraction using a self-fabricated mixed-mode sorbent based on poly(N-vinylimidazole/ethylene glycol dimethacrylate). Optimization was performed by variation of washing steps using a full three-level factorial design and response surface methodology...
November 14, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/29134301/prostaglandin-e2-receptor-ep1-in-healthy-and-diseased-human-endometrium
#18
Junyan Zhu, Doris Mayr, Christina Kuhn, Sven Mahner, Udo Jeschke, Viktoria von Schönfeldt
Prostaglandin E2 (PGE2) is well described to be associated with both endometrial functions and disorders. The primary aim of this study was to explore the underlying mechanisms that affect the growth and function of endometrial epithelium and stroma by assessing the staining intensity of PGE2 receptors (EP) in healthy endometrium across the menstrual cycle and in pathological endometrium, such as ovarian endometriosis and endometrial cancer. We retrospectively analyzed the EPs staining intensity in human nonpregnant endometrium throughout the menstrual cycle by immunohistochemistry and further focused on EP1 (n = 42)...
November 13, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/29134098/progressive-ontogenetic-niche-shift-over-the-prolonged-immaturity-period-of-wandering-albatrosses
#19
Alice Carravieri, Henri Weimerskirch, Paco Bustamante, Yves Cherel
Very little is known about trophic ontogenetic changes over the prolonged immaturity period of long-lived, wide-ranging seabirds. By using blood and feather trophic tracers (δ(13)C and δ(15)N, and mercury, Hg), we studied age-related changes in feeding ecology during the immature phase of wandering albatrosses Diomedea exulans when they gradually change from a pure oceanic life to visits to their future breeding grounds. Immatures fed in subtropical waters at high trophic positions during moult. Between- and within-individual variations in isotopic niche were very high, irrespective of age, highlighting wide-ranging exploratory behaviours...
October 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29133957/hidden-magnetic-states-emergent-under-electric-field-in-a-room-temperature-composite-magnetoelectric-multiferroic
#20
J D Clarkson, I Fina, Z Q Liu, Y Lee, J Kim, C Frontera, K Cordero, S Wisotzki, F Sanchez, J Sort, S L Hsu, C Ko, L Aballe, M Foerster, J Wu, H M Christen, J T Heron, D G Schlom, S Salahuddin, N Kioussis, J Fontcuberta, X Marti, R Ramesh
The ability to control a magnetic phase with an electric field is of great current interest for a variety of low power electronics in which the magnetic state is used either for information storage or logic operations. Over the past several years, there has been a considerable amount of research on pathways to control the direction of magnetization with an electric field. More recently, an alternative pathway involving the change of the magnetic state (ferromagnet to antiferromagnet) has been proposed. In this paper, we demonstrate electric field control of the Anomalous Hall Transport in a metamagnetic FeRh thin film, accompanying an antiferromagnet (AFM) to ferromagnet (FM) phase transition...
November 13, 2017: Scientific Reports
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