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https://read.qxmd.com/read/30878175/footprint-of-carbonyl-compounds-in-hand-scent-by-in-tube-solid-phase-microextraction-coupled-to-nano-liquid-chromatography-diode-array-detection
#1
M C Prieto-Blanco, S Peñafiel Barba, Y Moliner-Martínez, P Campíns-Falcó
In the present work, the footprint of carbonyl compounds in hand scent was achieved by a miniaturized method consisting of sampling with cotton gauze, extraction and derivatization using 2,4-dinitrophenylhydrazine (DNPH) and preconcentration, separation and detection by in-tube solid-phase microextraction (IT-SPME) coupled to nano-liquid chromatography/Uv-vis diode array detection. The coupling IT-SPME-nanoLC-DAD was solved by using a two-valve system: the first valve for loading the sample and the second one to perform IT-SPME...
March 4, 2019: Journal of Chromatography. A
https://read.qxmd.com/read/30874727/microbial-fe-ii-oxidation-by-sideroxydans-lithotrophicus-es-1-in-the-presence-of-schl%C3%A3-ppnerbrunnen-fen-derived-humic-acids
#2
Anke Hädrich, Martial Taillefert, Denise M Akob, Rebecca E Cooper, Ulrike Litzba, Friedrich E Wagner, Sandor Nietzsche, Valerian Ciobota, Petra Rösch, Jürgen Popp, Kirsten Küsel
Controlled laboratory experiments were combined with field measurements to better understand the interactions between dissolved organic matter (DOM) and reduced iron in organic-rich peatlands. Addition of peat-derived humic acid extract (HA) to Sideroxydans lithotrophicus ES-1 liquid cultures led to higher cell numbers and up to 1.4 times higher Fe(II) oxidation rates compared to chemical controls. This effect was positively correlated with increasing HA concentrations. Similar Fe(III) (oxyhydr)oxide mineralogies were formed both abiotically and biotically irrespective of HA amendment, but minerals formed in the presence of ES-1 and HA were smaller...
March 15, 2019: FEMS Microbiology Ecology
https://read.qxmd.com/read/30839711/hypergravity-assisted-chemical-liquid-deposition-of-nano-granular-film-on-the-inner-surface-of-a-quartz-tube
#3
Y K Shen, X Q He, X Gu, Z Liu, Z H He
Transparent tubes with functions of heating and temperature measurement are badly required in the visualization investigation of two-phase flows and flow-boiling heat transfer. In order to prepare such a tube, we introduced a cost-effective and energy-efficient procedure of hypergravity-assisted chemical liquid deposition (HACLD) to produce transparent and conductive silver (Ag) films on the inner surfaces of quartz tubes, typically 50 mm in length and 8 mm in inner diameter with a set-up that was designed and built for this purpose...
September 2018: Royal Society Open Science
https://read.qxmd.com/read/30810304/cavity-carbon-nanopipette-electrodes-for-dopamine-detection
#4
Cheng Yang, Keke Hu, Dengchao Wang, Yasmine S Zubi, Scott T Lee, Pumidech Puthongkham, Michael Mirkin, B Jill Venton
Microelectrodes are typically used for neurotransmitter detection, but nanoelectrodes are not because there is a trade-off between spatial resolution and sensitivity, which is dependent on surface area. Cavity carbon nanopipette electrodes (CNPEs), with tip diameters of a few hundred nanometers, have been developed for nano-scale electrochemistry. Here, we characterize the electrochemical performance of CNPEs with fast-scan cyclic voltammetry (FSCV) for the first time. Dopamine detection is compared at cavity CNPEs, with a depth equivalent to a few radii, and open-tube CNPEs, an essentially infinite geometry...
February 27, 2019: Analytical Chemistry
https://read.qxmd.com/read/30798600/isolation-of-single-wired-transition-metal-monochalcogenides-by-carbon-nanotubes
#5
Masataka Nagata, Shivani Shukula, Yusuke Nakanishi, Zheng Liu, Yung-Chang Lin, Takuma Shiga, Yuto Nakamura, Takeshi Koyama, Hideo Kishida, Tsukasa Inoue, Naoyuki Kanda, Shun Ohno, Yuki Sakagawa, Kazu Suenaga, Hisanori Shinohara
The successful isolation of single-layers from two-dimensional (2D) van der Waals (vdW)-layered materials has opened new frontiers in condensed matter physics and materials science. Their discovery and unique properties laid the foundation for exploring 1D counterparts. However, the isolation of 1D vdW-wired materials has thus far remained a challenge, and effective techniques are demanded. Here we report the facile synthesis of isolated transition-metal monochalcogenide MoTe nanowires by using carbon nanotubes (CNTs) as molds...
February 24, 2019: Nano Letters
https://read.qxmd.com/read/30764995/chromium-influenced-high-magnetic-moment-and-half-metallic-nature-of-gan-nanotube
#6
Manjeet Bhatia, Uma Shankar Sharma, Anurag Srivastava
Density functional theory-based calculations have been performed to analyze the electronic and magnetic properties of chromium doped (6, 0) GaN nanotube. The structural stability of GaN nano-tube has been defined in terms of formation energy, which increases as a function of magnetic impurity (Cr). The study demonstrates that the direct band gap semiconducting GaN nanotube transforms to half-metallic as a function of Cr introduction to GaN. This half metallic nature with high magnetic moment of Cr doped GaN nanotube can be a key parameter for its use in spintronics applications...
July 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30763634/core-matched-nanoassemblies-for-targeted-co-delivery-of-chemotherapy-and-photosensitizer-to-treat-drug-resistant-cancer
#7
Di Jiang, Minjun Xu, Yuanyuan Pei, Yukun Huang, Yu Chen, Fenfen Ma, Huiping Lu, Jun Chen
Emergence of drug resistance in tumors causes therapeutic failure or tumor relapse. Combination of chemotherapy and photodynamic therapy holds significant promise to treat drug-resistant tumors. However, stubborn hydrophobicity of photosensitizer (PS), low encapsulation efficiency and leaking problem of PS in organic carrier, and disparate physicochemical properties of PS and chemotherapeutics make the combination unachievable. Thus how to efficiently co-deliver the two functional agents to enable photo-chemotherapy seems to be one of the key challenges...
February 11, 2019: Acta Biomaterialia
https://read.qxmd.com/read/30711759/nano-polydopamine-crosslinked-thiol-functionalized-hyaluronic-acid-hydrogel-for-angiogenic-drug-delivery
#8
Ramanathan Yegappan, Vignesh Selvaprithiviraj, Annapoorna Mohandas, Rangasamy Jayakumar
Crosslinking of polymeric network using nanoparticles by physical or chemical method to obtain hydrogel is an emerging approach. Herein, we synthesized Polydopamine (PDA) nanoparticles via oxidative self-polymerization of dopamine in water-ethanol mixture. Thiol-functionalized hyaluronic acid was developed using cysteamine and hyaluronic acid (HA-Cys) via 1-Ethyl-3-(3-Dimethylaminopropyl) Carbodiimide - N-hydroxysuccinimide (EDC-NHS) crosslinking chemistry. Developed HA-Cys conjugate was cross-linked using PDA nanoparticles via Michael-type addition reaction...
January 22, 2019: Colloids and Surfaces. B, Biointerfaces
https://read.qxmd.com/read/30706776/comprehensive-review-on-graphene-oxide-for-use-in-drug-delivery-system
#9
Muhammad Daniyal, Bin Liu, Wei Wang
Motivated by the accomplishment of carbon nano tubes (CNTs), graphene and graphene oxide (GO) have been widely investigated in the previous quite a long while as an innovative medication nanocarrier for the stacking of a variety of therapeutics as well as anti-cancer medications, ineffectively dissolvable medications, anti-microbials, antibodies, peptides, DNA, RNA and genes. The greatly huge surface region of graphene, with each molecule uncovered on its two sides, is took into consideration ultra-high medication stacking effectiveness...
February 1, 2019: Current Medicinal Chemistry
https://read.qxmd.com/read/30685185/simulation-and-theory-of-open-tube-dispersion-in-short-and-long-capillaries-with-slip-boundaries-and-retention
#10
Matthew D Beauchamp, Mark R Schure
Using random walk techniques, high resolution simulations of zone shape are conducted in open capillary tubes for short and long tube conditions. Finite size solutes are used as tracers in this treatment. Slip flow boundary conditions and wall retention are utilized as needed. These simulations are able to reproduce previous work in short and long tubes. For the short tube case where dispersion does not asymptotically approach the classic Taylor-Aris and Golay solutions, the effect of slip flow boundaries in the transient region shows zone shapes with abbreviated tails where the larger slip flow values cause zone compression...
December 21, 2018: Journal of Chromatography. A
https://read.qxmd.com/read/30663409/fabrication-and-evaluation-a-transferrin-receptor-targeting-nano-drug-carrier-for-cerebral-infarction-treatment
#11
Junyi Shen, Zhiming Zhao, Wei Shang, Chunli Liu, Beibei Zhang, Zihan Xu, Hui Cai
After cerebral infarction, the regeneration of microvascular played an important role in the recovery. Ginsenoside Rg1 (Rg1) had good effects on promoting angiogenesis and neuro-protection in cerebral infarction treatment. However, the blood-brain barrier (BBB) restricted Rg1 to enter into cerebral tissue. Transferrin receptor (TfR) was over-expressed in the BBB. In this study, we fabricated a TfR targeting nano-carrier (PATRC) to penetrate the BBB for treatment of cerebral infarction. A TfR targeted peptide was conjugated with the nano-carrier wrapped hydrophobic Rg1...
December 2019: Artificial Cells, Nanomedicine, and Biotechnology
https://read.qxmd.com/read/30656225/corrigendum-to-effect-of-carbon-nano-tubes-and-dispersions-of-sic-and-al-2-o-3-on-the-mechanical-and-physical-properties-of-copper-nickel-alloy-heliyon-4-10-october-2018-e00876
#12
S El-Khatib, A Y Shash, A H Elsayed, A El-Habak
[This corrects the article DOI: 10.1016/j.heliyon.2018.e00876.].
January 2019: Heliyon
https://read.qxmd.com/read/30583544/characterization-of-elastic-polymer-based-smart-insole-and-a-simple-foot-plantar-pressure-visualization-method-using-16-electrodes
#13
Wangjoo Lee, Seung-Hyeon Hong, Hyun-Woo Oh
In this paper, we propose a smart insole for inexpensive plantar pressure sensing and a simple visualizing scheme. The insole is composed of two elastomeric layers and two electrode layers where the common top electrode is submerged in the insole. The upper elastomeric layer is non-conductive poly-dimethyl-siloxane (PDMS) and supports plantar pressure buffering and the lower layer is carbon nano-tube (CNT)-dispersed PDMS for pressure sensing through piezo-resistivity. Under the lower sensing layer are 16 bottom electrodes for pressure distribution sensing without cell-to-cell interference...
December 22, 2018: Sensors
https://read.qxmd.com/read/30576352/trynity-controls-epidermal-barrier-function-and-respiratory-tube-maturation-in-drosophila-by-modulating-apical-extracellular-matrix-nano-patterning
#14
Yuki Itakura, Sachi Inagaki, Housei Wada, Shigeo Hayashi
The outer surface of insects is covered by the cuticle, which is derived from the apical extracellular matrix (aECM). The aECM is secreted by epidermal cells during embryogenesis. The aECM exhibits large variations in structure, function, and constituent molecules, reflecting the enormous diversity in insect appearances. To investigate the molecular principles of aECM organization and function, here we studied the role of a conserved aECM protein, the ZP domain protein Trynity, in Drosophila melanogaster. We first identified trynity as an essential gene for epidermal barrier function...
2018: PloS One
https://read.qxmd.com/read/30566929/a-study-on-a-special-dna-nanotube-assembled-from-two-single-stranded-tiles
#15
Fei Xu, Tingfang Wu, Xiaolong Shi, Linqiang Pan
Single-stranded tile (SST) strategy offers precise control over the circumferences of nanotubes while the kinetic trap in the process of the self-assembly prevents the formation of wider tubes. Here, we report a simple and efficient method to build DNA nanotubes using only 2 SSTs via one-pot annealing. The diameters of the 2-SST nanotubes were much larger than what the kinetic trap theory would predict, indicating a new mechanism was at play in the formation of these nanotubes. Further investigation suggested that the 2-SST nanotubes were assembled through a hierarchical pathway that involved an intermediate formation of 2-SST nano-lines...
December 19, 2018: Nanotechnology
https://read.qxmd.com/read/30562451/a-review-of-micromotors-in-confinements-pores-channels-grooves-steps-interfaces-chains-and-swimming-in-the-bulk
#16
Zuyao Xiao, Mengshi Wei, Wei Wang
One of the recent frontiers of nanotechnology research involves machines that operate at nano- and microscales, also known as nano/micromotors. Their potential applications in biomedicine, environmental sciences and engineering, military and defense industries, self-assembly and many other areas have fueled an intense interest in this topic over the last fifteen years. Despite deepened understanding of their propulsion mechanisms, we are still in the early days of exploring the dynamics of micromotors in complex and more realistic environments...
December 18, 2018: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/30556909/fabrication-of-plumbagin-on-silver-nanoframework-for-tunable-redox-modulation-implications-for-therapeutic-angiogenesis
#17
Natarajan Duraipandy, Govindarajan Dharunya, Rachita Lakra, Purna Sai Korapatti, Manikantan Syamala Kiran
The redox state of the endothelial cells plays a key role in the regulation of the angiogenic process. The modulation of the redox state of endothelial cells (ECs) could be a viable target to alter angiogenic response. In the present work, we synthesized a redox modulator by caging 5-hydroxy 2-methyl 1, 4-napthoquinone (Plumbagin) on silver nano framework (PCSN) for tunable reactive oxygen species (ROS) inductive property and tested its role in ECs during angiogenic response in physiological and stimulated conditions...
December 17, 2018: Journal of Cellular Physiology
https://read.qxmd.com/read/30528253/micro-solid-phase-extraction-of-some-polycyclic-aromatic-hydrocarbons-from-environmental-water-samples-using-magnetic-%C3%AE-cyclodextrin-carbon-nano-tube-composite-as-a-sorbent
#18
Mina Yazdanpanah, Saeed Nojavan
Previous studies have demonstrated the excellent capability of the cyclodextrins in pre-concentration of the organic pollutants from the aqueous solutions. In this work, β-cyclodextrin- multiwalled carbon nano-tube composite was produced from the reaction of oxidized carbon nano-tube with cyclodextrin in the presence of the hydrazine hydrate, and subsequently attaching this composite to the iron oxide nano-particles. Prepared magnetic nano-composite was characterized by the attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), the thermogravimetric analysis (TGA), the field emission scanning electron microscopy (FESEM), and the X-ray diffraction (XRD)...
November 24, 2018: Journal of Chromatography. A
https://read.qxmd.com/read/30456618/pure-ultra-fine-carbon-particles-do-not-exert-pro-coagulation-and-inflammatory-effects-on-microvascular-endothelial-cells
#19
Hossein Dinmohammadi, Zahra Pirdel, Laleh Salarilak, Marc Hoylaerts, Reza Nejatbakhsh, Alireza Biglari, Marc Jacquemin, Tina Shahani
Pro-thrombotic and inflammatory changes play an important role in cardiovascular morbidity and mortality, resulting from short-term exposure to fine particulate air-pollution. Part of those effects has been attributed to the ultra-fine particles (UFPs) that pass through the lung and directly contact blood-exposed and circulating cells. Despite UFP-induced platelet activation, it is unclear whether the penetrated particles exert any direct effect on endothelial cells. While exposure levels are boosting as a result of world-wide increases in economic development and desertification, which create more air-polluted regions, as well as increase in demands for synthetic UFPs in medicine and various industries, further studies on the health effects of these particles are required...
November 19, 2018: Environmental Science and Pollution Research International
https://read.qxmd.com/read/30451491/high-conductivity-argyrodite-li-6-ps-5-cl-solid-electrolytes-prepared-via-optimized-sintering-processes-for-all-solid-state-lithium-sulfur-batteries
#20
Shuo Wang, Yibo Zhang, Xue Zhang, Ting Liu, Yuan-Hua Lin, Yang Shen, Liangliang Li, Ce-Wen Nan
Highly Li-ion conductive Li6 PS5 Cl solid-state electrolytes (SSEs) were prepared by solid-state sintering method. The influence of sintering temperature and duration on the phase, ionic conductivity, and activation energy of Li6 PS5 Cl was systematically investigated. The Li6 PS5 Cl electrolyte with a high ionic conductivity of 3.15 × 10-3 S cm-1 at room temperature (RT) was obtained by sintering at 550 °C for just 10 min, which was more efficient taking into account such a short preparation time in comparison with other reported methods to synthesize Li6 PS5 Cl SSEs...
November 29, 2018: ACS Applied Materials & Interfaces
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