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https://www.readbyqxmd.com/read/28921952/nano-air-seeds-trapped-in-mesoporous-janus-nanoparticles-facilitate-cavitation-and-enhance-ultrasound-imaging
#1
Konstantin Tamarov, Andrey Sviridov, Wujun Xu, Markus Malo, Valery Andreev, Victor Yu Timoshenko, Vesa-Pekka Lehto
The current contrast agents utilized in ultrasound (US) imaging are based on microbubbles which, however, suffer from a short lifetime in the systemic circulation. The present study introduces a new type of contrast agents for US imaging based on bioresorbable Janus nanoparticles (NPs) that are able to generate microbubbles in situ under US radiation for extended time. The Janus NPs were fabricated from porous silicon (PSi) that was modified via a nanostopper technique. The technique was exploited to prepare PSi NPs which had hydrophobic pore walls (inner face) while the external surfaces of the NPs (outer face) were hydrophilic...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920666/a-softoxometalate-k6-5cu-oh-8-5-h2o-7-5-0-5-k3pw12o40-n-n-1348-2024-as-an-efficient-inorganic-material-for-co2-reduction-with-concomitant-water-oxidation
#2
Santu Das, Saurabh Kumar, Somenath Garai, Ramudu Pochamoni, Shounik Paul, Soumyajit Roy
An immediate challenge for chemists is to devise different methods to trap chemical energy using light by reduction of carbon dioxide to a transportable fuel. To reach this goal the major obstacle lies in finding a suitable material that is abundant and possesses catalytic power to effect such reduction reaction and perform this reduction reaction without using any external photosensitizer. Here we report first time a softoxometalate, based on {[K6.5Cu(OH)8.5(H2O)7.5]0.5[K3PW12O40]} metal oxide framework which is stable in reaction condition that effectively performs photochemical CO2 reduction reaction in water with a very high turnover number of 613 and TOF of 47...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920438/conduction-mechanisms-at-interface-of-aln-sin-dielectric-stacks-with-algan-gan-heterostructures-for-normally-off-high-electron-mobility-transistors-correlating-device-behavior-with-nanoscale-interfaces-properties
#3
Giuseppe Greco, Patrick Fiorenza, Ferdinando Iucolano, Andrea Severino, Filippo Giannazzo, Fabrizio Roccaforte
In this work, the conduction mechanisms at the interface of AlN/SiN dielectric stacks with AlGaN/GaN heterostructures have been studied combining different macroscopic and nanoscale characterizations on bare materials and devices. The AlN/SiN stacks grown on the recessed region of AlGaN/GaN heterostructures have been used as gate dielectric of hybrid metal-insulator-semiconductor high electron mobility transistors (MISHEMTs), showing a normally-off behaviour (Vth=+1.2 V), high channel mobility (204 cm(2)V(-1)s(-1)), and very good switching behaviour (ION/IOFF current ratio of 5-6×10(8) and sub-threshold swing of 90 mV/dec)...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28919027/macrolactin-f-inhibits-rankl-mediated-osteoclastogenesis-by-suppressing-akt-mapk-and-nfatc1-pathways-and-promotes-osteoblastogenesis-through-a-bmp-2-smad-akt-runx2-signaling-pathway
#4
Liang Li, Mahesh Sapkota, Ming Gao, Hyukjae Choi, Yunjo Soh
The balance between bone formation and bone resorption is maintained by osteoblasts and osteoclasts. In the current study, macrolactin F (MF) was investigated for novel biological activity on the receptor activator of nuclear factor-κB (NF-κB) ligand (RANKL)-induced osteoclastogenesis in primary bone marrow-derived macrophages (BMMs). We found that RANKL-induced osteoclast formation and differentiation from BMMs was significantly inhibited by MF in a dose-dependent manner without cytotoxicity. RANKL-induced F-actin ring formation and bone resorption activity in BMMs which was attenuated by MF...
September 15, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28918310/effect-of-eplerenone-on-markers-of-bone-turnover-in-patients-with-primary-hyperparathyroidism-the-randomized-placebo-controlled-epath-trial
#5
Nicolas Verheyen, Martin R Grübler, Andreas Meinitzer, Christian Trummer, Verena Schwetz, Karin Amrein, Hans P Dimai, Winfried März, Cristiana Catena, Dirk von Lewinski, Jakob Voelkl, Ioana Alesutan, Astrid Fahrleitner-Pammer, Helmut Brussee, Stefan Pilz, Andreas Tomaschitz
Mineralocorticoid receptor (MR) antagonism may affect bone turnover via direct and indirect pathways involving parathyroid hormone, but randomized controlled trials are lacking. In a pre-specified analysis of the "Eplerenone in primary hyperparathyroidism" placebo-controlled, randomized trial (ISRCTN 33941607), effects of eight weeks MR-blockade with eplerenone on bone turnover markers in 97 patients with primary hyperparathyroidism were tested. Mean age was 67.5±9.5years, and 76 (78.4%) were females. In analysis of covariance with adjustment for baseline values, eplerenone had no significant effect on isoform 5b of the tartrate-resistant acid phosphatase (TRAP), beta-crosslaps, N-terminal propeptide of procollagen type 1 (P1NP), osteocalcin and bone-specific alkaline phosphatase...
September 13, 2017: Bone
https://www.readbyqxmd.com/read/28917762/full-validation-of-a-method-for-the-determination-of-drugs-of-abuse-in-non-mineralized-dental-biofilm-using-liquid-chromatography-tandem-mass-spectrometry-and-application-to-postmortem-samples
#6
Kerstin Henkel, Markus J Altenburger, Volker Auwärter, Merja A Neukamm
Alternative matrices play a major role in postmortem forensic toxicology, especially if common matrices (like body fluids or hair) are not available. Incorporation of illicit and medicinal drugs into non-mineralized dental biofilm (plaque) seems likely but has not been investigated so far. Analysis of plaque could therefore extend the spectrum of potentially used matrices in postmortem toxicology. For this reason, a rapid, simple and sensitive method for the extraction, determination and quantification of ten drugs of abuse from plaque using liquid chromatography-tandem mass spectrometry (LC-MS/MS) was developed and fully validated...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917128/application-of-ultra-high-performance-liquid-chromatography-coupled-with-ltq-orbitrap-mass-spectrometry-for-identification-confirmation-and-quantitation-of-illegal-adulterated-weight-loss-drugs-in-plant-dietary-supplements
#7
Qiaoyuan Cheng, Linjun Shou, Cen Chen, Shi Shi, Minghao Zhou
In this paper, an ultra-high-performance liquid chromatography coupled with linear ion trap quadrupole Orbitrap high resolution mass spectrometry (UHPLC-LTQ-Orbitrap HRMS) method was developed and validated for identification, confirmation and quantitation of illegal adulterated weight-loss drugs in plant dietary supplements. 13 wt-loss drugs were well separated by the gradient elution of 10mmol/L ammonium acetate - 0.05% formic acid H2O and acetonitrile at a flow rate of 0.2mL/min within 12min. The MS analysis was operated under the positive ion and in full MS/dd-MS(2) (data-dependent MS(2)) mode...
September 9, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28916095/review-novel-sensing-strategies-for-bacterial-detection-based-on-active-and-passive-methods-driven-by-external-field
#8
REVIEW
Shiho Tokonami, Takuya Iida
For sustainable human life, biosensing systems for contaminants or disease-causing bacteria are crucial for food security, environmental improvement, and disease prevention. With an aim of enhancing the sensitivity and detection speed, many researchers have developed efficient detection methods for target bacteria. In this review, we discuss recent topics related to active and passive bacterial detection methods, including (1) optical approaches with unique functional nano- and micro-structures, and (2) electrical approaches involving mechanical modulation and electrochemical reactions...
October 2, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28915936/high-sensitivity-and-selectivity-in-quantitative-analysis-of-drugs-in-biological-samples-using-4-column-multidimensional-micro-uhplc-ms-enabling-enhanced-sample-loading-capacity
#9
Ronald de Vries, Liesbeth Vereyken, Isabelle François, Lieve Dillen, Rob J Vreeken, Filip Cuyckens
Sensitivity is often a critical parameter in quantitative bioanalyses in drug development. For liquid-chromatography-based methods, sensitivity can be improved by reducing the column diameter, but practical sensitivity gains are limited by the reduced sample loading capacity on small internal diameter (I.D.) columns. We developed a set-up that has overcome these limitations in sample loading capacity. The set-up uses 4 columns with gradually decreasing column diameters along the flow-path (2.1 → 1 → 0...
October 9, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28915803/tartrate-resistant-acid-phosphatase-trap-acp5-promotes-metastasis-related-properties-via-tgf%C3%AE-2-t%C3%AE-r-and-cd44-in-mda-mb-231-breast-cancer-cells
#10
Anja Reithmeier, Elena Panizza, Michael Krumpel, Lukas M Orre, Rui M M Branca, Janne Lehtiö, Barbro Ek-Rylander, Göran Andersson
BACKGROUND: Tartrate-resistant acid phosphatase (TRAP/ACP5), a metalloenzyme that is characteristic for its expression in activated osteoclasts and in macrophages, has recently gained considerable focus as a driver of metastasis and was associated with clinically relevant parameters of cancer progression and cancer aggressiveness. METHODS: MDA-MB-231 breast cancer cells with different TRAP expression levels (overexpression and knockdown) were generated and characterized for protein expression and activity levels...
September 15, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28915480/facile-fabrication-of-mediator-free-z-scheme-photocatalyst-of-phosphorous-doped-ultrathin-graphitic-carbon-nitride-nanosheets-and-bismuth-vanadate-composites-with-enhanced-tetracycline-degradation-under-visible-light
#11
Yaocheng Deng, Lin Tang, Guangming Zeng, Jiajia Wang, Yaoyu Zhou, Jingjing Wang, Jing Tang, Longlu Wang, Chengyang Feng
To realize the sustainable employment of solar energy in contaminant degradation and environmental recovery, design and development of an efficient photocatalyst is urgently needed. Herein, a novel direct Z-scheme composite photocatalysts consist of phosphorous-doped ultrathin g-C3N4 nanosheets (PCNS) and bismuth vanadate (BiVO4) are developed via a one-pot impregnated precipitation method. The as-prepared hybrid nanocomposite was utilized for the degradation tetracycline (TC) under visible light irradiation...
September 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28915218/endotoxemia-results-in-trapping-of-transfused-red-blood-cells-in-lungs-with-associated-lung-injury
#12
Marleen Straat, Anita Tuip, Thomas R L Klei, Boukje M Beuger, Joris J T H Roelofs, Robin van Bruggen, Nicole P Juffermans
BACKGROUND: Red blood cell (RBC) transfusion is associated with organ failure, in particular in the critically ill. We hypothesized that endotoxemia contributes to increased trapping of RBCs in organs. Furthermore, we hypothesized that this effect is more pronounced following transfusion of stored RBCs compared with fresh RBCs. METHODS: Adult male Sprague-Dawley rats were randomized to receive injection with lipopolysaccharide from E coli or vehicle and transfusion with fresh or stored biotinylated RBCs...
October 2017: Shock
https://www.readbyqxmd.com/read/28914593/effects-of-local-administration-of-tiludronic-acid-on-experimental-periodontitis-in-diabetic-rats
#13
Nara L T Nunes, Michel R Messora, Luiz Fernando Oliveira, Mario Lisboa, Marina Costa Barcellos Garcia, Rodrigo O C C Rêgo, Arthur Belém Novaes, Sérgio Luís Scombatti de Souza, Edilson Ervolino, Flávia A C Furlaneto
BACKGROUND: Tiludronic acid (TIL) presents antiresorptive and anti-inflammatory properties and it has not been evaluated in the association periodontitis-diabetes mellitus (DM) to date. This study evaluated the effects of local administration of TIL on experimental periodontitis (EP) in rats with streptozotocin-induced DM. METHODS: Thirty-two animals (Rattus norvegicus, albinus, Wistar) were divided into groups DM/C (Control), DM/EP, DM/EP/TIL1 and DM/EP/TIL3. In groups EP, a ligature was placed around mandibular molars (MM)...
September 15, 2017: Journal of Periodontology
https://www.readbyqxmd.com/read/28913869/fast-growing-oysters-show-reduced-capacity-to-provide-a-thermal-refuge-to-intertidal-biodiversity-at-high-temperatures
#14
Dominic McAfee, Wayne A O'Connor, Melanie J Bishop
1.Ecosystem engineers that modify the thermal environment experienced by associated organisms might assist in the climate change adaptation of species. This depends upon the ability of ecosystem engineers to persist and continue to ameliorate thermal stress under changing climatic conditions - traits that may display significant intraspecific variation. 2.In the physically stressful intertidal, the complex three-dimensional structure of oysters provides shading and traps moisture during aerial exposure at low tide...
September 15, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28913429/ultrahigh-mobility-and-efficient-charge-injection-in-monolayer-organic-thin-film-transistors-on-boron-nitride
#15
Daowei He, Jingsi Qiao, Linglong Zhang, Junya Wang, Tu Lan, Jun Qian, Yun Li, Yi Shi, Yang Chai, Wei Lan, Luis K Ono, Yabing Qi, Jian-Bin Xu, Wei Ji, Xinran Wang
Organic thin-film transistors (OTFTs) with high mobility and low contact resistance have been actively pursued as building blocks for low-cost organic electronics. In conventional solution-processed or vacuum-deposited OTFTs, due to interfacial defects and traps, the organic film has to reach a certain thickness for efficient charge transport. Using an ultimate monolayer of 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) molecules as an OTFT channel, we demonstrate remarkable electrical characteristics, including intrinsic hole mobility over 30 cm(2)/Vs, Ohmic contact with 100 Ω · cm resistance, and band-like transport down to 150 K...
September 2017: Science Advances
https://www.readbyqxmd.com/read/28902508/single-molecule-fluorescence-microscopy-reveals-local-diffusion-coefficients-in-the-pore-network-of-an-individual-catalyst-particle
#16
Frank C Hendriks, Florian Meirer, Alexey V Kubarev, Zoran Ristanović, Maarten B J Roeffaers, Eelco T C Vogt, Pieter C A Bruijnincx, Bert M Weckhuysen
We used single-molecule fluorescence microscopy to study self-diffusion of a feedstock-like probe molecule with nanometer accuracy in the macropores of a micrometer-sized, real-life fluid catalytic cracking (FCC) particle. Movies of single fluorescent molecules allowed their movement through the pore network to be reconstructed. The observed tracks were classified into three different states by machine learning and all found to be distributed homogeneously over the particle. Most probe molecules (88%) were immobile, with the molecule most likely being physisorbed or trapped; the remainder was either mobile (8%), with the molecule moving inside the macropores, or showed hybrid behavior (4%)...
September 13, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28902258/phlebotomines-in-an-area-endemic-for-american-cutaneous-leishmaniasis-in-northeastern-coast-of-brazil
#17
Ana Patricia Oliveira da Silva, Débora Elienai de Oliveira Miranda, Marcos Antônio Bezerra Santos, Neurisvan Ramos Guerra, Silvia Rafaelli Marques, Leucio Câmara Alves, Rafael Antonio Nascimento Ramos, Gílcia Aparecida de Carvalho
Phlebotomines have worldwide distribution with many species present in Brazil, including the northeastern region, where the fauna is very diverse. The aim of this study was to identify the sandfly fauna in an area endemic for American cutaneous leishmaniasis (ACL) in the state of Pernambuco. Sandflies were caught on three consecutive nights every month from October 2015 to September 2016, from 5 pm to 5 am, using seven light traps of Centers for Disease Control (CDC) type. Females were identified and used for molecular Leishmania detection...
August 24, 2017: Revista Brasileira de Parasitologia Veterinária, Brazilian Journal of Veterinary Parasitology
https://www.readbyqxmd.com/read/28901739/back-electron-transfer-at-tio2-nanotube-photoanodes-in-the-presence-of-a-h2o2-hole-scavenger
#18
Heng Zhu, Shicheng Yan, Zhaosheng Li, Zhigang Zou
Adding charge scavengers, which usually are more unstable than water, is an effective method to quantify the quantum efficiency loss of photoelectrode during the charge separation, transfer, and injection processes of the water splitting reaction. Here, we detected, on TiO2 nanotube photoanodes after using hydrogen peroxide (H2O2) as a hole scavenger, a nearly 40% saturated photocurrent decrease in alkaline electrolyte and a negligible saturated photocurrent difference in acid electrolyte. We found that the photoelectrons were trapped in the surface states of TiO2 with the nearly same storage capacity of electrons in a wide range of pH values from 1...
September 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28900809/production-identification-and-field-evaluation-of-sex-pheromone-from-calling-females-in-diaphania-angustalis-lepidoptera-crambidae
#19
Tao Ma, Zhitao Liu, Cai Wang, Shengnan Zhang, Xianhui Shi, Zhaohui Sun, Xiaoyang Chen, Caijuan Jia, Changlu Wang, Yurong He, Xiujun Wen
Insect sex pheromones play a crucial role in the mate finding and calling behavior of Lepidoptera pests. Currently, little is known about the chemical ecology of Diaphania angustalis Snellen (Lepidoptera: Crambidae), a severe and important defoliator attacking the medicinal plant, Alstonia scholaris. In the present study, the pheromone components of D. angustalis females were investigated using electrophysiological and behavioral methods. Distilled hexane extracts of female pheromone glands were analyzed through electroantennogram (EAG) and gas chromatography-electroantennogram detector (GC-EAD), and the active compounds were identified through gas chromatography-mass spectrometry (GC-MS)...
September 12, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28900097/electrical-properties-and-thermal-stability-in-stack-structure-of-hfo2-al2o3-insb-by-atomic-layer-deposition
#20
Min Baik, Hang-Kyu Kang, Yu-Seon Kang, Kwang-Sik Jeong, Youngseo An, Seongheum Choi, Hyoungsub Kim, Jin-Dong Song, Mann-Ho Cho
Changes in the electrical properties and thermal stability of HfO2 grown on Al2O3-passivated InSb by atomic layer deposition (ALD) were investigated. The deposited HfO2 on InSb at a temperature of 200 °C was in an amorphous phase with low interfacial defect states. During post-deposition annealing (PDA) at 400 °C, In-Sb bonding was dissociated and diffusion through HfO2 occurred. The diffusion of indium atoms from the InSb substrate into the HfO2 increased during PDA at 400 °C. Most of the diffused atoms reacted with oxygen in the overall HfO2 layer, which degraded the capacitance equivalent thickness (CET)...
September 12, 2017: Scientific Reports
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