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https://www.readbyqxmd.com/read/29668126/an-unconventional-polymerization-route-to-hydrophilic-fluorescent-organic-nanoparticles-for-multicolor-cellular-bioimaging
#1
Qingfu Ban, Jie Kong, Yinglai Hou, Jianxin Chen, Wen Sun, Xiaofei Zhang, Si Wu
We demonstrated an unconventional polymerization route to synthesize hydrophilic fluorescent organic nanoparticles (FONs) for multicolor cellular bioimaging in this contribution. Actually, it benefits from our unexpected discovery of a rapid polymerization reaction between 1, 6-hexanediol dipropiolate and 2, 4, 6-triazide-1, 3, 5-triazine under the catalysis of N, N, N', N", N"-pentamethyldiethylenetriamine (PMDETA). Interestingly, the 2, 4, 6-triazide-1, 3, 5-triazine and PMDETA system can also induce rapid free radical polymerization at room temperature...
April 18, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29668113/molecular-dynamics-analysis-of-charge-transport-in-ionic-liquid-electrolytes-containing-added-salt-with-mono-di-and-trivalent-metal-cations
#2
José Manuel Vicent-Luna, Eneko Azaceta, Said Hamad, José Manuel Ortiz-Roldán, Ramón Tena-Zaera, Sofía Calero, Juan Antonio Anta
Among many other applications, room-temperature ionic liquids (ILs) are used as electrolytes for storage and energy-conversion devices. In this work, we investigate, at the microscopic level, the structural and dynamical properties of 1-methyl-1-butyl-pyrrolidinium bis(trifluoromethanesulfonyl) imide [C4 PYR]+ [Tf2 N]- IL-based electrolytes for metal-ion batteries. We carried out molecular dynamics simulations of electrolytes mainly composed of [C4 PYR]+ [Tf2 N]- IL with the addition of Mn+ -[Tf2 N]- metal salts (M=Li+ , Na+ , Ni2+ , Zn2+ , Co2+ , Cd2+ , and Al3+ , n=1, 2, and 3) dissolved in the IL...
April 18, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/29668024/nutrition-considerations-after-nicu-discharge
#3
Taylor Peters, Cecelia Pompeii-Wolfe
Preterm infants are at high nutrition risk during neonatal intensive care and well after discharge. Nutrition care should be individualized and provided by a multidisciplinary team including a dietitian. Breast milk, the gold standard for feeding, may not meet the increased needs of preterm infants and may require fortification or supplementation. Decisions regarding formula choice and calorie concentration can also be challenging and require individualization based on growth, intake, and individual need. Developmental milestones should be considered during the initation of complementary food...
April 1, 2018: Pediatric Annals
https://www.readbyqxmd.com/read/29668002/a-sharp-edge-based-acoustofluidic-chemical-signal-generator
#4
Po-Hsun Huang, Chung Yu Chan, Peng Li, Yuqi Wang, Nitesh Nama, Hunter Bachman, Tony Jun Huang
Resolving the temporal dynamics of cell signaling pathways is essential for regulating numerous downstream functions, from gene expression to cellular responses. Mapping these signaling pathways requires the exposure of cells to time-varying chemical signals; these are difficult to generate and control over a wide temporal range. Herein, we present an acoustofluidic chemical signal generator based on a sharp-edge-based micromixing strategy. The device, simply by modulating the driving signals of an acoustic transducer including the ON/OFF switching frequency, actuation time and duty cycle, is capable of generating both single-pulse and periodic chemical signals that are temporally controllable in terms of stimulation period, stimulation duration and duty cycle...
April 18, 2018: Lab on a Chip
https://www.readbyqxmd.com/read/29668001/aero-gel-assisted-synthesis-of-anatase-tio-2-nanoparticles-for-humidity-sensing-application
#5
Ekta Poonia, Prashant Kumar Mishra, Vijay Kiran, Jasbir Sangwan, Rakesh Kumar, Pramod Kumar Rai, Vijay K Tomer
Aero-gel based one-pot synthesis of anatase phase TiO2 nanoparticles having a high surface area of 125 m2 g-1 has been reported in this work. The humidity sensing perfomance of the obtained porous TiO2 nanoparticles exhibits a quick response (2 s) and fast recovery (1.5 s), negligible hysteresis (<1%) and good stability in the 11-98%RH range. The relationship between %RH and resistance was found to be linear while the sensitivity increases with increase in %RH.
April 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29668000/cd-in-codoped-tio-2-nanochips-for-high-efficiency-photocatalytic-dye-degradation
#6
Dongliang Liu, Peng Huang, Yong Liu, Zhou Wu, Dongsheng Li, Jun Guo, Tao Wu
Titanium dioxide has been widely investigated in the field of photocatalysis research. However, the wide bandgap (3.2 eV) greatly limits its practical applications because only ultraviolet light can be absorbed by bare TiO2. Herein, we report a facile approach to prepare Cd/In-codoped TiO2 nanochips with the capability of visible light absorption. Such bimetallic-doped TiO2 was synthesized through a two-step process: Cd/In/S-TiO2 gels were first synthesized by mixing the preformed Cd-In-S supertetrahedral nanoclusters with a titanium source, and the subsequent pyrolytic process effectively converted the gels into Cd/In-TiO2 nanochips with a thickness of ∼2...
April 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29667998/isolation-purification-characterization-and-bioactivities-of-a-glucan-from-the-root-of-pueraria-lobata
#7
Can Xu, Ningbo Qin, Chunyan Yan, Shumei Wang
The root of Pueraria lobata is considered to be a medicinal and edible herb for the treatment of diabetes, and it has a long history of application in China. To explore the constituents responsible for the anti-hyperglycemic activities of P. lobata, a water-soluble polysaccharide (PL70-1-1) was isolated and purified by using a DEAE-Cellulose 52 anion exchange column and a Sephacryl S-100 gel filtration column. Its molecular weight (2584 Da) was determined by high performance gel permeation chromatography (HPGPC)...
April 18, 2018: Food & Function
https://www.readbyqxmd.com/read/29667991/estimating-system-parameters-for-solvent-water-and-plant-cuticle-water-using-quantum-chemically-estimated-abraham-solute-parameters
#8
Yuzhen Liang, Tifany L Torralba-Sanchez, Dominic M Di Toro
Polyparameter Linear Free Energy Relationships (pp-LFERs) using Abraham system parameters have many useful applications. However, developing the Abraham system parameters depends on the availability and quality of the Abraham solute parameters. Using Quantum Chemically estimated Abraham solute Parameters (QCAP) is shown to produce pp-LFERs that have lower root mean square errors (RMSEs) of predictions for solvent-water partition coefficients than parameters that are estimated using other presently available methods...
April 18, 2018: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/29667939/a-photochemical-approach-for-a-fast-and-self-limited-covalent-modification-of-surface-supported-graphene-with-photoactive-dyes
#9
Natalia Sergeeva, Alexander N Chaika, Brian Walls, Barry Murphy, Killian Walshe, David Martin, Billy D O Richards, Gin Jose, K Fleischer, Victor Aristov, Olga Molodtsova, Igor V Shvets, Sergey Krasnikov
Herein, we report a simple method for a covalent modification of surface-supported graphene with photoactive dyes. Graphene was fabricated on cubic-SiC/Si(001) wafers due to their low cost and suitability for mass-production of continuous graphene fit for electronic applications on millimetre scale. Functionalisation of the graphene surface was carried out in solution via white light-induced photochemical generation of phenazine radicals from phenazine diazonium salt. The resulting covalently bonded phenazine-graphene hybrid structure was characterised by scanning tunnelling microscopy (STM) and spectroscopy (STS), Raman spectroscopy and density functional theory (DFT) calculations...
April 18, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29667874/evaluation-of-a-test-and-cull-strategy-for-reducing-prevalence-of-chronic-wasting-disease-in-mule-deer-odocoileus-hemionus
#10
Lisa L Wolfe, Mary Kay Watry, Michael A Sirochman, Tracey M Sirochman, Michael W Miller
  We evaluated a test and cull strategy for lowering chronic wasting disease (CWD) prevalence in a naturally-infected, free-ranging mule deer ( Odocoileus hemionus) herd wintering in the town of Estes Park, Colorado, USA and in nearby Rocky Mountain National Park. We tested 48-68% of the estimated number of adult (≥1 yr old) deer annually for 5 yr via tonsil biopsy immunohistochemistry (IHC), collecting 1,251 samples from >700 individuals and removing IHC-positive deer. Among males, CWD prevalence during the last 3 yr of selective culling was lower (one-sided Fisher's exact test P=0...
April 18, 2018: Journal of Wildlife Diseases
https://www.readbyqxmd.com/read/29667860/educational-needs-in-the-diagnosis-and-management-of-pediatric-functional-constipation-a-us-survey-of-specialist-and-primary-care-clinicians
#11
Justin Barnes, Brandon Coleman, Sharon Hwang, Aleksandra Stolic, Athos Bousvaros, Samuel Nurko, Gregory D Salinas
OBJECTIVES: The goal of this study was to identify opportunities among gastroenterologists and gastroenterology nurse practitioners (NPs)/physician assistants (PAs) for continuing medical education (CME) related to functional constipation. METHODS: An online, case-vignette survey was designed to identify and quantify practice patterns of pediatric gastroenterology clinicians. Case vignettes are a validated method for assessing clinician practice patterns. The survey consisted of three patient cases: a 3-year-old female with a 6-month history of constipation; a 6-year-old male with a 1-year history of constipation refractory to treatment and a sacral dimple with nearby tuft of hair; and a 16-year-old male with a 10-year history of constipation, and a sullen, depressed mood...
April 18, 2018: Postgraduate Medicine
https://www.readbyqxmd.com/read/29667838/general-synthetic-strategy-for-libraries-of-supported-multicomponent-metal-nanoparticles
#12
Hui Yang, Siobhan J Bradley, Xin Wu, Andrew Chan, Geoffrey I N Waterhouse, Thomas Nann, Jian Zhang, Paul E Kruger, Shengqian Ma, Shane G Telfer
Nanoparticles comprising three or more different metals are challenging to prepare. General methods that tackle this challenge are highly sought after as multicomponent metal nanoparticles display favorable properties in applications such as catalysis, biomedicine, and imaging. Herein, we report a practical and versatile approach for the synthesis of nanoparticles composed of up to four different metals. This method relies on the thermal decomposition of nanostructured composite materials assembled from platinum nanoparticles, a metal-organic framework (ZIF-8), and a tannic acid coordination polymer...
April 18, 2018: ACS Nano
https://www.readbyqxmd.com/read/29667830/dynamics-of-contact-line-pinning-and-depinning-of-droplets-evaporating-on-micro-ribs
#13
Ali Mazloomi Moqaddam, Dominique Derome, Jan Carmeliet
The contact line dynamics of evaporating droplets deposited on a set of parallel micro-ribs is analyzed with the use of a recently developed entropic lattice Boltzmann model for two-phase flow. Upon deposition, part of the droplet penetrates into the space between ribs due to capillary action, while the remaining liquid of the droplet remains pinned on top of the micro-ribs. In a first stage, evaporation continues until the droplet undergoes a series of pinning-depinning events, showing alternatively constant contact radius and constant contact angle modes...
April 18, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29667818/balancing-the-electron-and-hole-transfer-for-efficient-quantum-dot-light-emitting-diodes-by-employing-a-versatile-organic-electron-blocking-layer
#14
Xiao Jin, Chun Chang, Weifeng Zhao, Shujuan Huang, Xiaobing Gu, Qin Zhang, Feng Li, Yubao Zhang, Qinghua Li
The electron blocking layer (EBL) is important to balance the charge carrier transfer and achieve highly efficient quantum dot light-emitting diodes (QLEDs). Here we report the utilization of a soluble tert-butyldimethylsilyl chloride-modified poly(p-phenylene benzobisoxazole) (TBS-PBO) as an EBL for simultaneous good charge carrier transfer balance while maintaining high current density. We show that the versatile TBS-PBO blocks excess electron injection into the QDs, thus leading to better charge carrier transfer balance...
April 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29667815/theranostic-pt-iv-conjugate-with-target-selectivity-for-androgen-receptor
#15
Xiaodong Qin, Lei Fang, Jian Zhao, Shaohua Gou
It is difficult to diagnose and treat castration-resistant prostate cancer (CRPC) which occurs due to the overexpression of androgen receptor (AR). Because there is a high level of AR in CRPC, we designed and prepared three Pt(IV)-based prodrugs targeting AR. Among them, compound 3, a three-in-one hybrid (an AR binding ligand, a cisplatin unit, and a coumarin moiety), was found to display satisfactory AR binding affinity and antagonist activity against androgen receptor, which could also be effectively internalized and visualized in LNCaP (AR+) cells...
April 18, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29667813/a-sensitive-water-soluble-reversible-optical-probe-for-hg-2-detection
#16
Sayani Das, Anindita Sarkar, Ananya Rakshit, Ankona Datta
We report the serendipitous discovery of an optical mercury sensor while trying to develop a water-soluble manganese probe. The sensor is based on a pentaaza macrocycle conjugated to a hemicyanine dye. The pentaaza macrocycle earlier designed in our group was used to develop photoinduced electron transfer (PET)-based "turn-on" fluorescent sensors for manganese. (1) In an attempt to increase the water-solubility of the manganese sensors we changed the dye from BODIPY to hemicyanine. The resultant molecule qHCM afforded a distinct reversible change in the absorption features and a concomitant visible color change upon binding to Hg2+ ions, leading to a highly water-soluble mercury sensor with a 10 ppb detection limit...
April 18, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29667727/stimuli-responsive-peptide-gels-and-some-bio-applications
#17
Natashya Falcone, Heinz-Bernhard Kraatz
Supramolecular gels are a fascinating class of soft materials that have attracted significant attention in recent years. They are composed of small molecule gelators that assemble into supramolecular network structures. The resulting space is filled with solvent. Some gel materials are able to respond to various stimuli making them attractive drug delivery vehicles and as matrices for tissue regeneration. Peptide based gel materials are particularly attractive as they possess numerous advantages including biocompatibility and biodegradability...
April 18, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29667710/towards-sustainable-c-h-functionalization-reactions-the-emerging-role-of-bio-based-reaction-media
#18
Stefano Santoro, Assunta Marrocchi, Daniela Lanari, Lutz Ackermann, Luigi Vaccaro
In the last decade, transition-metal catalyzed C-H functionalization reactions have progressed enourmosly, becoming a useful tool in organic synthesis and a practibable alternative to well-established methodologies. Very recently, research efforts have also been devoted to developing more sustainable C-H functionalization protocols, in order to increase their applicability. One of the most promising approaches in this sense is represented by the substitution of common reaction media with bio-based solvents...
April 18, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29667686/rheological-characterization-of-dynamic-remodeling-of-the-pericellular-region-by-human-mesenchymal-stem-cell-secreted-enzymes-in-well-defined-synthetic-hydrogel-scaffolds
#19
Maryam Daviran, Sarah M Longwill, Jonah F Casella, Kelly M Schultz
Human mesenchymal stem cells (hMSCs) dynamically remodel their microenvironment during basic processes, such as migration and differentiation. Migration requires extracellular matrix invasion, necessitating dynamic cell-material interactions. Understanding these interactions is critical to advancing materials designs that harness and manipulate these processes for applications including wound healing and tissue regeneration. In this work, we encapsulate hMSCs in a cell-degradable poly(ethylene glycol)-peptide hydrogel to determine how cell-secreted enzymes, specifically matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs), create unique pericellular microenvironments...
April 18, 2018: Soft Matter
https://www.readbyqxmd.com/read/29667676/functional-inks-and-printing-of-two-dimensional-materials
#20
REVIEW
Guohua Hu, Joohoon Kang, Leonard W T Ng, Xiaoxi Zhu, Richard C T Howe, Christopher G Jones, Mark C Hersam, Tawfique Hasan
Graphene and related two-dimensional materials provide an ideal platform for next generation disruptive technologies and applications. Exploiting these solution-processed two-dimensional materials in printing can accelerate this development by allowing additive patterning on both rigid and conformable substrates for flexible device design and large-scale, high-speed, cost-effective manufacturing. In this review, we summarise the current progress on ink formulation of two-dimensional materials and the printable applications enabled by them...
April 18, 2018: Chemical Society Reviews
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