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https://www.readbyqxmd.com/read/28732306/photostability-testing-using-online-reactor-hplc-hyphenation-and-mass-spectrometric-compound-identification-illustrated-by-ketoprofen-as-model-compound
#1
Jaber Assaf, Diego Zulkiewicz Gomes, Bernhard Wuest, Maria Kristina Parr
Investigations on the photochemical stability of pharmaceutical substances are mandatory in drug development and licensing as photo-induced degradation of an active pharmaceutical ingredient (API) may not only lead to decreased API concentrations but also to toxic or reactive products. Thus, the US Food and Drug Administration (FDA) and the International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use (ICH) issued Guidance for Industry Q1B "Photostability Testing of New Drug Substances and Products" for testing of pure but also packed drugs...
July 8, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28732076/eincr1-is-an-egf-inducible-lincrna-overexpressed-in-lung-adenocarcinomas
#2
Karol Nowicki-Osuch, Yaoyong Li, Mairi Challinor, David T Gerrard, Neil A Hanley, Andrew D Sharrocks
Long non-coding RNAs are being increasingly recognised as important molecules involved in regulating a diverse array of biological functions. For example, many long non-coding RNAs have been associated with tumourigenesis and in this context their molecular functions often involves impacting on chromatin and transcriptional control processes. One important cellular control system that is often deregulated in cancer cells is the ERK MAP kinase pathway. Here we have investigated whether ERK pathway signaling in response to EGF stimulation, leads to changes in the production of long non-coding RNAs...
2017: PloS One
https://www.readbyqxmd.com/read/28731691/singlet-oxygen-photophysics-in-liquid-solvents-converging-on-a-unified-picture
#3
Mikkel Bregnhøj, Michael Westberg, Boris F Minaev, Peter R Ogilby
Singlet oxygen, O2(a(1)Δg), the lowest excited electronic state of molecular oxygen, is an omnipresent part of life on earth. It is readily formed through a variety of chemical and photochemical processes, and its unique reactions are important not just as a tool in chemical syntheses but also in processes that range from polymer degradation to signaling in biological cells. For these reasons, O2(a(1)Δg) has been the subject of intense activity in a broad distribution of scientific fields for the past ∼50 years...
July 21, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28731351/theory-of-light-modulated-emission-spectroscopy
#4
Mehdi Ansari-Rad, Juan Bisquert
Perovskite solar cells and fluorescent collectors formed by a dispersion of quantum dots in a transparent solid are paradigmatic devices for photon capture and utilization that involve the coupling of photon displacement, absorption and regeneration. In order to obtain information about the coupled photonic processes in systems involving photon recycling, we analyse the transfer function for modulated outgoing to incoming photon flux. We show the physical features of light-to-light impedance that reveals a trap-limited diffusion of photons coupled with the nonradiative recombination...
July 21, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28731326/oxygen-partial-pressure-during-pulsed-laser-deposition-deterministic-role-on-thermodynamic-stability-of-atomic-termination-sequence-at-srruo3-batio3-interface
#5
Yeong Jae Shin, Lingfei Wang, Yoonkoo Kim, Ho-Hyun Nahm, Daesu Lee, Jeong Rae Kim, Sang Mo Yang, Jong-Gul Yoon, Jin-Seok Chung, Miyoung Kim, Seo Hyoung Chang, Tae Won Noh
With recent trends on miniaturizing oxide-based devices, the need for atomic-scale control of surface/interface structures by pulsed laser deposition (PLD) has increased. In particular, realizing uniform atomic termination at the surface/interface is highly desirable. However, a lack of understanding on the surface formation mechanism in PLD has limited a deliberate control of surface/interface atomic stacking sequences. Here, taking the prototypical SrRuO3/BaTiO3/SrRuO3 (SRO/BTO/SRO) heterostructure as a model system, we investigated the formation of different interfacial termination sequences (BaO-RuO2 or TiO2-SrO) with oxygen partial pressure (PO2) during PLD...
July 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28730871/effects-of-timing-of-signal-indicating-jump-directions-on-knee-biomechanics-in-jump-landing-jump-tasks
#6
Mitchell L Stephenson, Taylour J Hinshaw, Haley A Wadley, Qin Zhu, Margaret A Wilson, Mark Byra, Boyi Dai
A variety of the available time to react (ATR) has been utilised to study knee biomechanics during reactive jump-landing tasks. The purpose was to quantify knee kinematics and kinetics during a jump-land-jump task of three possible directions as the ATR was reduced. Thirty-four recreational athletes performed 45 trials of a jump-land-jump task, during which the direction of the second jump (lateral, medial or vertical) was indicated before they initiated the first jump, the instant they initiated the first jump, 300 ms before landing, 150 ms before landing or at the instant of landing...
July 21, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28730698/boar-sperm-quality-after-supplementation-of-diets-with-omega-3-polyunsaturated-fatty-acids-extracted-from-microalgae
#7
Y T Andriola, F Moreira, E Anastácio, F A Camelo, A C Silva, A S Varela, S M M Gheller, K L Goularte, C D Corcini, T Lucia
This study evaluated effects of diet supplementation with omega-3 polyunsaturated fatty acids (PUFA) from microalgae on boar sperm quality. Two groups of boars (n = 3 each) were fed during 75 days either a commercial diet (control), or the same diet supplemented with omega-3 PUFA from the heterotrophic microalgae Schizochytrium sp. (120 g/kg). Sixteen ejaculates were collected per boar. Some sperm kinetics parameters were inferior for supplemented than for control boars (p < .05): distance average path; distance in both curved and straight line; velocity average path, velocity in both curved and straight line; and amplitude of lateral head displacement...
July 21, 2017: Andrologia
https://www.readbyqxmd.com/read/28730309/a-simple-and-rapid-infrared-assisted-self-enzymolysis-extraction-method-for-total-flavonoid-aglycones-extraction-from-scutellariae-radix-and-mechanism-exploration
#8
Liping Wang, Haotian Duan, Jiebing Jiang, Jiakun Long, Yingjia Yu, Guiliang Chen, Gengli Duan
A new, simple, and fast infrared-assisted self enzymolysis extraction (IRASEE) approach for the extraction of total flavonoid aglycones (TFA) mainly including baicalein, wogonin, and oroxylin A from Scutellariae Radix is presented to enhance extraction yield. Extraction enzymolysis temperature, enzymolysis liquid-to-solid ratio, enzymolysis pH, enzymolysis time and infrared power, the factors affecting IRASEE procedure, were investigated in a newly designed, temperature-controlled infrared-assisted extraction (TC-IRAE) system to acquire the optimum analysis conditions...
July 20, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28729892/reversible-charge-trapping-in-bis-carbazole-diimide-redox-polymers-with-complete-luminescence-quenching-enabling-nondestructive-read-out-by-resonance-raman-spectroscopy
#9
Luuk Kortekaas, Federico Lancia, Jorn D Steen, Wesley R Browne
The coupling of substituted carbazole compounds through carbon-carbon bond formation upon one-electron oxidation is shown to be a highly versatile approach to the formation of redox polymer films. Although the polymerization of single carbazole units has been proposed earlier, we show that by tethering pairs of carbazoles double sequential dimerization allows for facile formation of redox polymer films with fine control over film thickness. We show that the design of the monomers and in particular the bridging units is key to polymer formation, with the diaminobenzene motif proving advantageous, in terms of the matching to the redox potentials of the monomer and polymer film and thereby avoiding limitations in film thickness (autoinsulation), but introduces unacceptable instability due to the intrinsic redox activity of this moiety...
July 13, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28729813/novel-design-integrating-a-microwave-applicator-into-a-crystallizer-for-rapid-temperature-cycling-a-direct-nucleation-control-study
#10
Rohit Kacker, Marilena Radoiu, Herman J M Kramer
The control of nucleation in crystallization processes is a challenging task due to the often lacking knowledge on the process kinetics. Inflexible (predetermined) control strategies fail to grow the nucleated crystals to the desired quality because of the variability in the process conditions, disturbances, and the stochastic nature of crystal nucleation. Previously, the concept of microwave assisted direct nucleation control (DNC) was demonstrated in a laboratory setup to control the crystal size distribution in a batch crystallization process by manipulating the number of particles in the system...
July 5, 2017: Crystal Growth & Design
https://www.readbyqxmd.com/read/28729683/a-positive-feedback-loop-mediated-by-sigma-x-enhances-expression-of-the-streptococcal-regulator-comr
#11
Rabia Khan, Roger Junges, Heidi A Åmdal, Tsute Chen, Donald A Morrison, Fernanda C Petersen
Natural transformation is used by bacteria to take up DNA from their surroundings and incorporate it into their genomes. Streptococci do so during a transient period of competence, triggered by pheromones that they produce, secrete and sense under conditions influenced by the environment. In Streptococcus mutans, Streptococcus suis, and species of the bovis, salivarius and pyogenic groups of streptococci, the pheromone XIP is sensed by the intra-cellular regulator ComR, that in turn activates the transcription of comS, encoding the XIP precursor, and of sigX, encoding the only known alternative sigma factor in streptococci...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28729058/impacts-of-sensation-perception-and-motor-abilities-of-the-ipsilesional-upper-limb-on-hand-functions-in-unilateral-stroke-quantifications-from-biomechanical-and-functional-perspectives
#12
Hsiu-Yun Hsu, Chia-Wen Ke, Ta-Shen Kuan, Hsiu-Ching Yang, Ching-Liang Tsai, Li-Chieh Kuo
BACKGROUND: The presence of subtle losses in hand dexterity after stroke impacts the regaining of independence with regard to activities of daily living. Therefore, awareness of ipsilesional upper extremity (UE) function may be of importance when drafting a comprehensive rehabilitation program. However, current hand function tests seem to be unable to identify asymptomatic UE impairments. OBJECTIVES: To assess the motor coordination as well as the sensory-perception of an ipsilesional UE using biomechanical analysis of performance-oriented tasks and conducting a Manual Tactile Test (MTT)...
July 17, 2017: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/28728983/etv4-and-ap1-transcription-factors-form-multivalent-interactions-with-three-sites-on-the-med25-activator-interacting-domain
#13
Simon L Currie, Jedediah J Doane, Kathryn S Evans, Niraja Bhachech, Bethany J Madison, Desmond K W Lau, Lawrence P McIntosh, Jack J Skalicky, Kathleen A Clark, Barbara J Graves
The recruitment of transcriptional cofactors by sequence-specific transcription factors challenges the basis of high affinity and selective interactions. Extending previous studies that the N-terminal activation domain (AD) of ETV5 interacts with Mediator subunit 25 (MED25), we establish that similar, aromatic-rich motifs located both in the AD and in the DNA-binding domain (DBD) of the related ETS factor ETV4 interact with MED25. These ETV4 regions bind MED25 independently, display distinct kinetics, and combine to contribute to a high-affinity interaction of full-length ETV4 with MED25...
July 17, 2017: Journal of Molecular Biology
https://www.readbyqxmd.com/read/28728361/influence-of-barley-grain-treated-with-alkaline-compounds-or-organic-extracts-on-ex-vivo-site-and-extent-of-digestion-of-starch
#14
Reza Naseroleslami, Mohsen Danesh Mesgaran, Abdolmansour Tahmasbi, Alireza Vakili, Seyed Hadi Ebrahimi
Objective: Two ex vivo experiments were conducted to verify the effect of barley grain (Nusrat cultivar) treated with alkaline compounds (AC) including alum, ammonium, and sodium hydroxide or cation-exchanged organic extracts (OE) prepared from alfalfa hay, sugar beet pulp and Ulva Fasciata, on extent and digestion site of starch. Methods: In the first study, the in vitro first order disappearance kinetic parameters of dry matter (DM), crude protein (CP) and starch were estimated using a non-linear model (D(t)= D(i)...
June 27, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28727452/catalytic-intermolecular-carboamination-of-unactivated-alkenes-via-directed-aminopalladation
#15
Zhen Liu, Yanyan Wang, Zichen Wang, Tian Zeng, Peng Liu, Keary M Engle
An intermolecular 1,2-carboamination of unactivated alkenes proceeding via a Pd(II)/Pd(IV) catalytic cycle has been developed. To realize this transformation, a cleavable bidentate directing group is used to control the regioselectivity of aminopalladation and stabilize the resulting organopalladium(II) intermediate, such that oxidative addition to a carbon electrophile outcompetes potential β-hydride elimination. Under the optimized reaction conditions, a broad range of nitrogen nucleophiles and carbon electrophiles were compatible coupling partners in this reaction, affording moderate to high yields...
July 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28727442/manipulating-semicrystalline-polymers-in-confinement
#16
Nitin Shingne, Markus Geuss, Thomas Thurn-Albrecht, Hans-Werner Schmidt, Carmen Mijangos, Martin Steinhart, Jaime Martin
Because final properties of nanoscale polymeric structures are largely determined by the solid-state microstructure of the confined polymer, it is imperative not only to understand how the microstructure of polymers develops under nanoscale confinement but also to establish means to manipulate it. Here we present a series of processing strategies, adapted from methods used in bulk polymer processing, that allow to control the solidification of polymer materials confined in the nanopores of anodic aluminium oxide (AAO) templates...
July 20, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28726389/anti-melanogenic-effect-of-urolithin-a-and-urolithin-b-the-colonic-metabolites-of-ellagic-acid-in-b16-melanoma-cells
#17
Shang-Ta Wang, Wei-Chia Chang, Chen Hsu, Nan-Wei Su
Anti-melanogenic agents from natural sources have been widely investigated. Urolithin A (UA) and B (UB), the main gut microflora metabolites of dietary ellagic acid derivatives, have various bioactivities such as anti-inflammatory and anti-aging effects. In this study, the metabolites were found to possess depigmentation efficacy by suppressing tyrosinase activity. Both UA and UB could attenuate melanogenesis in B16 melanoma cells at non-cytotoxic doses, and UA showed comparable efficacy to positive control, kojic acid group...
July 20, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28726384/lightweight-room-temperature-co2-gas-sensor-based-on-rare-earth-metal-free-composites-an-impedance-study
#18
Christoph Willa, Alexander Schmid, Danick Briand, Jiayin Yuan, Dorota Koziej
We report a light, flexible, and low-power poly(ionic liquid)/alumina composite CO2 sensor. We monitor the direct-current resistance changes as a function of CO2 concentration and relative humidity and demonstrate fast and reversible sensing kinetics. Moreover, on the basis of the alternating-current impedance measurements we propose a sensing mechanism related to proton conduction and gas diffusion. The findings presented herein will promote the development of organic/inorganic composite CO2 gas sensors. In the future, such sensors will be useful for numerous practical applications ranging from indoor air quality control to the monitoring of manufacturing processes...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28726313/selectivity-enhancements-in-gel-based-dna-nanoparticle-assays-by-membrane-induced-isotachophoresis-thermodynamics-versus-kinetics
#19
Steven Marczak, Elaine Smith, Satyajyoti Senapati, Hsueh-Chia Chang
Selectivity against mutant nontargets with a few mismatches remains challenging in nucleic acid sensing. Sensitivity enhancement by analyte concentration does not improve selectivity because it affects targets and nontargets equally. Hydrodynamic or electrical shear enhanced selectivity is often accompanied by substantial losses in target signals, thereby leading to poor limits of detection. We introduce a platform based on depletion isotachophoresis in agarose gel generated by an ion-selective membrane that allows both selectivity and sensitivity enhancement with a two-step assay involving concentration polarization at an ion-selective membrane...
July 20, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28725139/hybrid-polymeric-matrices-for-oral-modified-release-of-desvenlafaxine-succinate-tablets
#20
Wael Samy, Ayman Elnoby, Hanan M El-Gowelli, Nazik Elgindy
Purpose: Desvenlafaxine succinate (DSV) is a water soluble anti-depressant drug, which is rapidly absorbed after oral administration exaggerating its side effects. The current work aimed to prepare controllable release DSV matrix to reduce DSV side effects related to its initial burst. Methods: Fifteen DSV matrix formulations were prepared using different polymers, polymer/drug ratios and matrix excipients and characterized using Differential Scanning Calorimetry (DSC), infrared (IR) spectroscopy, water uptake and in vitro DSV release...
July 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
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