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oxygen carriers

Hanwen Liu, Kui Hu, Dafeng Yan, Ru Chen, Yuqin Zou, Hongbo Liu, Shuangyin Wang
As a new type of 2D semiconductor, black phosphorus (BP) possesses high charge-carrier mobility and theoretical capacity, thickness-dependent bandgap, and anisotropic structure, which has attracted tremendous attention since early 2014. To explore its full application in all aspects, studies based on BP nanostructures are swiftly expanding from the electronic field to energy storage and even biochemistry. The mechanism and application of BP in Li-/Na-ion battery anodes, oxygen evolution reaction/hydrogen evolution reaction catalysis, photocatalytic hydrogen production, and selective sensors are summarized...
May 21, 2018: Advanced Materials
Seiichi Ohta, Kenichiro Hashimoto, Xiaoting Fu, Masamichi Kamihira, Yasuyuki Sakai, Taichi Ito
Novel hemoglobin-based artificial oxygen carriers are necessary in tissue engineering. We developed human hemoglobin (hHb) and albumin (HSA)-based microspheres using Shirasu porous glass (SPG) membrane emulsification. The obtained microspheres had a uniform size with an average diameter of 15.1 μm measured by optical microscope, which is similar to the diameter of human red blood cells (7-8 μm). The loading amount of hHb in the microspheres was 20 wt%, which is similar to that of red blood cells (33 wt%)...
May 15, 2018: Journal of Bioscience and Bioengineering
Min-Hye Jeong, Dohyun Kwak, Hyun-Soo Ra, A-Young Lee, Jong-Soo Lee
Few-layer black phosphorus has shown great potential for next-generation electronics with tunable band gap and high carrier mobility. For the electronic applications, the thickness modulation of a BP flake is an essential due to its thickness-dependent electronic properties. However, controlling the precise thickness of few-layer BP is a challenge for the high-performance device applications. In this study, we demonstrate that thermal treatment under ambient condition precisely controls the thickness of BP flake...
May 17, 2018: ACS Applied Materials & Interfaces
Kristy J Kormondy, Lingyuan Gao, Xiang Li, Sirong Lu, Agham B Posadas, Shida Shen, Maxim Tsoi, Martha R McCartney, David J Smith, Jianshi Zhou, Leonid L Lev, Marius-Adrian Husanu, Vladimir N Strocov, Alexander A Demkov
The development of novel nano-oxide spintronic devices would benefit greatly from interfacing with emergent phenomena at oxide interfaces. In this paper, we integrate highly spin-split ferromagnetic semiconductor EuO onto perovskite SrTiO3 (001). A careful deposition of Eu metal by molecular beam epitaxy results in EuO growth via oxygen out-diffusion from SrTiO3 . This in turn leaves behind a highly conductive interfacial layer through generation of oxygen vacancies. Below the Curie temperature of 70 K of EuO, this spin-polarized two-dimensional t 2g electron gas at the EuO/SrTiO3 interface displays very large positive linear magnetoresistance (MR)...
May 16, 2018: Scientific Reports
Mohammad H Zarifi, Benjamin Daniel Wiltshire, Najia Mahdi, Karthik Shankar, Mojgan Daneshmand
A large signal DC bias and a small signal microwave bias were simultaneously applied to TiO2 nanotube membranes mounted on a planar microwave resonator. The DC bias modulated the electron concentration in the TiO2 nanotubes, and was varied between 0 and 120 V in this study. Transients immediately following the application and removal of DC bias were measured by monitoring the S-parameters of the resonator as a function of time. The DC bias stimulated Poole-Frenkel type trap-mediated electrical injection of excess carriers into TiO2 nanotubes which resulted in a near constant resonant frequency but a pronounced decrease in the microwave amplitude due to free electron absorption...
May 16, 2018: ACS Applied Materials & Interfaces
Ruth Beckervordersandforth
The life-long generation of new neurons from radial glia-like neural stem cells (NSCs) is achieved through a stereotypic developmental sequence that requires precise regulatory mechanisms to prevent exhaustion or uncontrolled growth of the stem cell pool. Cellular metabolism is the new kid on the block of adult neurogenesis research and the identity of stage-specific metabolic programs and their impact on neurogenesis turns out to be an emerging research topic in the field. Mitochondrial metabolism is best known for energy production but it contains a great deal more...
November 9, 2017: Brain Plasticity
Hoay Yan Cheah, Elena Gallon, Fabienne Dumoulin, See Ziau Hoe, Nina Japundžić-Žigon, Sofija Glumac, Hong Boon Lee, Prem Anand, Lip Yong Chung, Maria Jesus Vicent, Lik Voon Kiew
We previously developed a new zinc (II) phthalocyanine (ZnPc) derivative (Pc 1) conjugated to poly-L-glutamic acid (PGA) (1-PG) to address the limitations of ZnPc as part of an antitumor photodynamic therapy approach, which include hydrophobicity, phototoxicity and non-selectivity in biodistribution and tumor targeting. During this study, we discovered that 1-PG possessed high near infrared (NIR) light absorptivity (λmax = 675 nm), good singlet oxygen generation efficiency in an aqueous environment, and enhanced photocytotoxic efficacy and cancer cell uptake in vitro...
May 15, 2018: Molecular Pharmaceutics
Miroslav Petr, Petr Stastny, Adam Zajac, James J Tufano, Agnieszka Maciejewska-Skrendo
BACKGROUND: The peroxisome proliferator-activated receptors ( PPARA , PPARG , PPARD ) and their transcriptional coactivators' ( PPARGC1A , PPARGC1B ) gene polymorphisms have been associated with muscle morphology, oxygen uptake, power output and endurance performance. The purpose of this review is to determine whether the PPARs and/or their coactivators' polymorphisms can predict the training response to specific training stimuli. METHODS: In accordance with the Preferred Reporting Items for Systematic Reviews and Meta Analyses, a literature review has been run for a combination of PPARs and physical activity key words...
May 15, 2018: International Journal of Molecular Sciences
Yongfu Sun, Ju Wu, Xiaodong Li, Wen Shi, Peiquan Ling, Xingchen Jiao, Shan Gao, Liang Liang, Jiaqi Xu, Wensheng Yan, Chengming Wang, Yi Xie
Solar CO2 reduction efficiency is largely limited by poor photoabsorption, sluggish electron-hole separation and high CO2 activation barrier. Herein, we employ defect engineering to fully optimize these crucial processes. As a prototype, we initially fabricate BiOBr atomic layers, and hence deliberately create abundant oxygen vacancies on their surfaces, affirmed by near-edge X-ray absorption fine structure and electron paramagnetic resonance spectra. Theoretical calculations unveil the new defect level resulting from oxygen vacancy extends photo-response to visible-light region, while the charge delocalization around oxygen vacancies contributes to CO2 activation into COOH* intermediate, confirmed by in-situ FTIR spectra...
May 15, 2018: Angewandte Chemie
Mariusz Bral, Boris Gala-Lopez, Aducio Thiesen, Sanaz Hatami, David L Bigam, Darren M Freed, A M James Shapiro
BACKGROUND: In current studies of ex situ liver perfusion there exists considerable variability in perfusate composition, including the type of oxygen carrier. Herein we aim to clarify the minimal hemoglobin level necessary during normothermic porcine ex situ liver perfusion. METHODS: Livers procured from 35- 45 Kg domestic pigs were connected to our experimental ex situ circuit (n=10). In the treatment group, perfusate was sequentially diluted hourly to predetermined hemoglobin levels...
May 7, 2018: Transplantation
Vijayakameswara Rao N, Hwa Seung Han, Hansang Lee, Van Quy Nguyen, Sangmin Jeon, Dae-Woong Jung, Jeongjin Lee, Gi-Ra Yi, Jae Hyung Park
Mesoporous silica nanoparticles (MSNs) with stimuli-responsive gatekeepers have been extensively investigated for controlled drug delivery at the target sites. Herein, we developed reactive oxygen species (ROS)-responsive MSNs (R-MSNs), consisting of a gadolinium (Gd)-DOTA complex as the ROS-responsive gatekeeper and polyethylene glycol (PEG)-conjugated chlorin e6 as the ROS generator, for magnetic resonance (MR) imaging-guided photodynamic chemotherapy. Doxorubicin (DOX), chosen as an anticancer drug, was physically encapsulated into DOTA-conjugated MSNs, followed by chemical crosslinking via the addition of GdCl3...
May 14, 2018: Nanoscale
Jianjun Hu, Chong Li, Qianhui Guo, Jiatao Dang, Quanguo Zhang, Duu-Jong Lee, Yunlong Yang
The iron-based oxygen carriers (OC's), Fe2 O3 /support (Al2 O3 , TiO2 , SiO2 and ZrO2 ), for chemical looping gasification of wheat straw were prepared using impregnation method. The surface morphology, crystal structure, carbon deposition potential, lattice oxygen activity and selectivity of the yielded OCs were examined. The Fe2 O3 /Al2 O3 OCs at 60% loading has the highest H2 yield, H2 /CO ratio, gas yield, and carbon conversion amongst the tested OC's. Parametric studies revealed that an optimal loading Fe2 O3 of 60%, steam-to-biomass ratio of 0...
May 3, 2018: Bioresource Technology
Quan Wang, Ruirui Zhang, Guoxing You, Jilin Hu, Penglong Li, Ying Wang, Jun Zhang, Yan Wu, Lian Zhao, Hong Zhou
Oxidative toxicity has impeded the development of haemoglobin-based oxygen carriers (HBOCs) by causing methaemoglobin (MetHb) formation and inducing oxidative stress. In our previous work, polydopamine-coated haemoglobin (Hb-PDA) nanoparticles have been designed and synthesized with the capacity to reduce oxidative toxicity. In this investigation, the mass ratio of dopamine (DA) to haemoglobin (Hb) and the pH value are found to be the primary factors that influence preparation of Hb-PDA nanoparticles. X-ray photoelectron spectroscopy showed that the catechol groups of DA play a crucial role in the modification of Hb surface...
May 10, 2018: Artificial Cells, Nanomedicine, and Biotechnology
Penghui He, CongBiao Jiang, Linfeng Lan, Sheng Sun, Yuzhi Li, Peixiong Gao, Peng Zhang, Xingqiang Dai, Jian Wang, Junbiao Peng, Yong Cao
Light-emitting filed-effect transistors (LEFETs) have attained great attention due to its special characteristic with both of the switching capacity and the electroluminescence capacity. However, high performance LEFETs with high mobility, high brightness and high efficiency have not been realized due to the difficulty in developing high electron and hole mobility materials with suitable band structures. In this paper, quantum-dot hybrid LEFETs (QD-HLEFETs) combined high luminous-efficiency quantum dots (QDs) and solution-processed scandium-incorporated indium oxide (Sc:In2O3) semiconductor were demonstrated...
May 9, 2018: ACS Nano
Misun Hong, Chunzhen Yang, Raymond A Wong, Aiko Nakao, Hee Cheul Choi, Hye Ryung Byon
An ongoing challenge with lithium-oxygen (Li-O2 ) batteries is in deciphering the oxygen evolution reaction (OER) process related to the slow decomposition of the insulating lithium peroxide (Li2 O2 ). Herein, we shed light on the behavior of Li2 O2 oxidation by exploiting various in situ imaging, gas analysis and electrochemical methods. At the low potentials of 3.2-3.7 V (vs. Li/Li+ ), OER is exclusive to the thinner parts of the Li2 O2 deposits, which leads to O2 gas evolution, followed by the concomitant release of superoxide species...
May 9, 2018: Journal of the American Chemical Society
Zhengqi Shi, Ahalapitiya H Jayatissa
With the rapid increase of efficiency up to 22.1% during the past few years, hybrid organic-inorganic metal halide perovskite solar cells (PSCs) have become a research “hot spot” for many solar cell researchers. The perovskite materials show various advantages such as long carrier diffusion lengths, widely-tunable band gap with great light absorption potential. The low-cost fabrication techniques together with the high efficiency makes PSCs comparable with Si-based solar cells. But the drawbacks such as device instability, J-V hysteresis and lead toxicity reduce the further improvement and the future commercialization of PSCs...
May 4, 2018: Materials
Yu Huang, Yunxia Gao, Qian Zhang, Yufei Zhang, Jun-Ji Cao, Wingkei Ho, Shun Cheng Lee
Development of biocompatible photocatalysts with improved charge separation and high selectivity is essential for effective removal of air pollutants. Iron-containing catalysts have attracted extensive attention due to their low-toxicity and high natural abundance. Here, carbon quantum dots (CQDs) modified FeOOH nanocomposites fabricated using a facile hydrothermal route showed enhanced NO removal efficiency (22%) compared to pure FeOOH. Moreover, generation of toxic NO2 intermediates was significantly inhibited using the nanocomposites, demonstrating high selectivity for final nitrate formation...
April 27, 2018: Journal of Hazardous Materials
Mercedes Peleteiro, Elena Presas, Jose Vicente González-Aramundiz, Beatriz Sánchez-Correa, Rosana Simón-Vázquez, Noemi Csaba, María J Alonso, África González-Fernández
The use of biomaterials and nanosystems in antigen delivery has played a major role in the development of novel vaccine formulations in the last few decades. In an effort to gain a deeper understanding of the interactions between these systems and immunocompetent cells, we describe here a systematic in vitro and in vivo study on three types of polymeric nanocapsules (NCs). These carriers, which contained protamine (PR), polyarginine (PARG), or chitosan (CS) in the external shell, and their corresponding nanoemulsion were prepared, and their main physicochemical properties were characterized...
2018: Frontiers in Immunology
Lei Wang, Bin Fang, Toshifumi Fujiwara, Kimberly Krager, Akshita Gorantla, Chaoyuan Li, Jian Q Feng, Michael L Jennings, Jian Zhou, Nukhet Aykin-Burns, Haibo Zhao
Osteoporosis, osteopenia, and pathological bone fractures are frequent complications of iron-overload conditions such as hereditary hemochromatosis, thalassemia, and sickle cell disease. Moreover, animal models of iron overload have revealed increased bone resorption and decreased bone formation. Although systemic iron overload affects multiple organs and tissues, leading to significant changes on bone modeling and remodeling, the cell autonomous effects of excessive iron on bone cells remain unknown. Here, to elucidate the role of cellular iron homeostasis in osteoclasts, we generated two mouse strains in which solute carrier family 40 member 1 (Slc40a1), a gene encoding ferroportin (FPN), the sole iron exporter in mammalian cells, were specifically deleted in myeloid osteoclast precursors or mature cells...
May 3, 2018: Journal of Biological Chemistry
Jun-Dar Hwang, Hsin-Yu Chen, Yu-Hung Chen, Ting-Hsiu Ho
The rectifying characteristic of Au/ZnO Schottky diodes (SDs) was remarkably improved by introducing a NiO layer in-between the Au and ZnO layers. Compared with the Au/ZnO SDs, the introduction of the NiO layer significantly enhanced the rectification ratio from 1.38 to 1,300, and reduced the ideality factor from 5.78 to 2.14. The NiO and ZnO layers were deposited on an indium-tin-oxide/glass substrate by radio-frequency magnetron sputtering. Secondary ion mass spectroscopy showed that Ni atoms diffused from NiO to ZnO, leading to a graded distribution of Ni in ZnO...
May 3, 2018: Nanotechnology
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