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https://www.readbyqxmd.com/read/29145173/a-new-method-for-fast-extraction-and-determination-of-chlorophylls-in-natural-water
#1
Nianwei Qiu, Xiushun Wang, Feng Zhou
Algae collection and chlorophyll extraction are two troublesome steps in the traditional methods used for the determination of chlorophyll concentration in natural water. A new method was established in this study for fast collection and extraction of chlorophyll. Based on our results, the optimum centrifugation condition for collecting algae was determined as: 5000 g for 15 min at 4 °C, and the optimum dilution ratio of dimethyl sulfoxide: 90% acetone was 1:4. The specific steps were as follows: the algae in water samples were collected by centrifugation at 5000 g at 4 °C for 15 min...
November 16, 2017: Zeitschrift Für Naturforschung. C, A Journal of Biosciences
https://www.readbyqxmd.com/read/29144983/albumin-coordinated-assembly-of-clearable-platinum-nanodots-for-photo-induced-cancer-theranostics
#2
Yong'an Tang, Tao Yang, Qiaoli Wang, Xiaoyan Lv, Xue Song, Hengte Ke, Zhengqing Guo, Xiaoqing Huang, Jun Hu, Zifu Li, Peng Yang, Xiangliang Yang, Huabing Chen
Photoactive noble metal nanoparticles are of increasing importance toward personalized cancer therapy in the field of precision nanomedicine. A critical challenge remains in the exploration of clinically potential noble metal nanoparticles for highly efficient cancer theranostics. Here, we introduce albumin-coordinated assembly of clearable Pt nanodots (Pt-NDs) with monodisperse nanostructure as high-performance theranostic agents for imaging-guided photothermal tumor ablation. We precisely manipulate the reduction and growth of tetravalent Pt ions into ultrasmall nanodots through albumin-directed growth kinetics, thereby leading to the synthesis of monodisperse 6...
October 20, 2017: Biomaterials
https://www.readbyqxmd.com/read/29144583/silicon-based-dielectric-metamaterials-focus-on-the-current-synthetic-challenges
#3
Maria Letizia De Marco, Sanaa Semlali, Brian A Korgel, Philippe Barois, Glenna L Drisko, Cyril Aymonier
Metamaterials have optical properties that are unprecedented in nature. They have opened new horizons in light manipulation, with the ability to bend, focus, and completely reflect, transmit or absorb an incident wave front. Optically active metamaterials in particular could be used for applications ranging from 3D information storage, more efficient photovoltaic cells, high security watermarks, and fiber optics. Silicon (Si) particles are some of the most promising building blocks for optically active metamaterials, with high scattering efficiency coupled to low light absorption for visible frequencies...
November 16, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29144554/a-sensitive-colorimetric-dna-biosensor-for-specific-detection-of-the-hbv-gene-based-on-silver-coated-glass-slide-and-g-quadruplex-hemin-dnazyme
#4
Yubin Li, Sheng Liu, Qiujuan Deng, Liansheng Ling
A sensitive colorimetric DNA biosensor for specific detection of single stranded oligonucleotide (ssDNA) is proposed in this paper. The biosensor is based on silver-coated glass (SCGS) and G-quadruplex-hemin DNAzyme. Capture DNA is immobilized on the surface of SCGS by Ag-S bond. Signal DNA can be used to hybridize with the target DNA which is selected from the Hepatitis B virus(HBV) gene as target HBV DNA, and the HRP-mimicking G-quadruplex-hemin DNAzyme can be formed through the function of a guanine-rich fragment from signal DNA to catalyze the oxidation of 2,2-azinobis(3-ethylbenzothiozoline)-6-sulfonicacid (ABTS(2-) ) by H2 O2 ...
November 16, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/29144463/a-single-cell-survey-of-the-small-intestinal-epithelium
#5
Adam L Haber, Moshe Biton, Noga Rogel, Rebecca H Herbst, Karthik Shekhar, Christopher Smillie, Grace Burgin, Toni M Delorey, Michael R Howitt, Yarden Katz, Itay Tirosh, Semir Beyaz, Danielle Dionne, Mei Zhang, Raktima Raychowdhury, Wendy S Garrett, Orit Rozenblatt-Rosen, Hai Ning Shi, Omer Yilmaz, Ramnik J Xavier, Aviv Regev
Intestinal epithelial cells absorb nutrients, respond to microbes, function as a barrier and help to coordinate immune responses. Here we report profiling of 53,193 individual epithelial cells from the small intestine and organoids of mice, which enabled the identification and characterization of previously unknown subtypes of intestinal epithelial cell and their gene signatures. We found unexpected diversity in hormone-secreting enteroendocrine cells and constructed the taxonomy of newly identified subtypes, and distinguished between two subtypes of tuft cell, one of which expresses the epithelial cytokine Tslp and the pan-immune marker CD45, which was not previously associated with non-haematopoietic cells...
November 16, 2017: Nature
https://www.readbyqxmd.com/read/29144428/resistance-of-magnesium-alloys-to-corrosion-fatigue-for-biodegradable-implant-applications-current-status-and-challenges
#6
REVIEW
R K Singh Raman, Shervin Eslami Harandi
Magnesium (Mg) alloys are attracting increasing interest as the most suitable metallic materials for construction of biodegradable and bio-absorbable temporary implants. However, Mg-alloys can suffer premature and catastrophic fracture under the synergy of cyclic loading and corrosion (i.e., corrosion fatigue (CF)). Though Mg alloys are reported to be susceptible to CF also in the corrosive human body fluid, there are very limited studies on this topic. Furthermore, the in vitro test parameters employed in these investigations have not properly simulated the actual conditions in the human body...
November 16, 2017: Materials
https://www.readbyqxmd.com/read/29144286/effects-and-mechanistic-aspects-of-absorbing-organic-compounds-by-coking-coal
#7
Kejia Ning, Junfeng Wang, Hongxiang Xu, Xianfeng Sun, Gen Huang, Guowei Liu, Lingmei Zhou
Coal is a porous medium and natural absorbent. It can be used for its original purpose after adsorbing organic compounds, its value does not reduce and the pollutants are recycled, and then through systemic circulation of coking wastewater zero emissions can be achieved. Thus, a novel method of industrial organic wastewater treatment using adsorption on coal is introduced. Coking coal was used as an adsorbent in batch adsorption experiments. The quinoline, indole, pyridine and phenol removal efficiencies of coal adsorption were investigated...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144015/elucidating-the-impact-of-chalcogen-content-on-the-photovoltaic-properties-of-oxychalcogenide-perovkskites-namo3-xqx-m-nb-ta-and-q-s-se-te
#8
Heesoo Park, Fahhad H Alharbi, Stefano Sanvito, Nouar Tabet, Fedwa El-Mellouhi
In the quest for non-toxic and stable perovskites for solar cells, we conduct a systematic study of the effect of chalcogen content in oxychalcogenide perovskite using density functional theory (DFT) and quasi-particle perturbation theory. We explore the changes in the electronic structure due to the substitution of O atoms in NaNbO 3 and NaTaO 3 perovskite structures with various chalcogen (S, Se, Te) at different concentrations. Interestingly, the introduction of the chalcogen atoms results in a drastic reduction of the electronic band gap, making some of them fall within the visible range of the solar spectrum...
November 16, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/29143988/synthesis-and-optical-properties-of-phenanthroline-derived-schiff-base-like-dinuclear-ru-ii-ni-ii-complexes
#9
Hannah Kurz, Charles Lochenie, Kristina G Wagner, Sandra Schneider, Matthias Karg, Birgit Weber
Two phenanthroline-derived Schiff base-like ligands with a covalently-linked Ru(II) phosphorescent unit were synthesised and converted into bimetallic Ru(II)-Ni(II) complexes. The optical properties were studied to examine a possible photoluminescence quenching through a non-radiative energy transfer upon Coordination Induced Spin State Switch (CISSS) at the Ni(II) centre. Therefore the metalloligands and the Ni(II) complexes were studied by UV-Vis absorbance as well as steady-state and time-resolved emission spectroscopy in MeCN and pyridine solutions...
November 16, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29143669/considerations-for-using-minocycline-vs-doxycycline-for-treatment-of-canine-heartworm-disease
#10
Mark G Papich
BACKGROUND: Doxycycline has been considered the first drug of choice for treating Wolbachia, a member of the Rickettsiaceae, which has a symbiotic relationship with filarial worms, including heartworms. Wolbachia, is susceptible to tetracyclines, which have been used as adjunctive treatments for heartworm disease. Treatment with doxycycline reduces Wolbachia numbers in all stages of heartworms and improves outcomes and decreased microfilaremia in dogs treated for heartworm disease. The American Heartworm Society recommends treatment with doxycycline in dogs diagnosed with heartworm disease at a dose of 10 mg/kg twice daily for 28 days...
November 9, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/29143574/investigating-the-preventive-effects-of-baicalin-and-gallocatechin-aginst-glyoxal-induced-cystatin-aggregation
#11
Aamir Sohail, Waseem Feeroze Bhat, Mohammad Furkan, Aaliya Shah, Bilqees Bano
Several mammalian proteins form pathological deposits under nonphysiological conditions that are associated with many degenerative diseases. Protein aggregation is associated with aging, as well as a variety of diseases, including cystic fibrosis, amyotrophic lateral sclerosis (ALS), and hypertrophic cardiomyopathy. There is a lack of any potential anti-amyloidogenic agents and therapeutics till date. Polyphenols have been accredited with myriad biological effects. An analysis of the effects of natural agents like baicalin (BC) and gallocatechin (GC) on aggregation process can open new avenues for the treatment of protein misfolding diseases...
November 16, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/29143420/investigation-of-surface-sulfurization-in-cuin1-xgaxs2-ysey-thin-films-to-enhance-photovoltaic-properties
#12
Haeri Kim, Se Jin Park, Byungwoo Kim, Yun Jeong Hwang, Byoung Koun Min
CuIn1-xGaxS2-ySey (CIGSSe) thin films have attracted a great deal of attention as a promising absorbing material for solar cell applications due to their favorable optical properties (e.g. a direct band gap and high absorption coefficients) and stable structure. Many studies have sought to improve the efficiency of solar cells using these films, and it has been found that surface modification via post heat treatment can lead to surface passivation of surface defects and a subsequent increase in efficiency. The surface properties of solution-processed CIGSSe films are considered to be particularly important in this respect due to the fact they are more prone to defects...
November 15, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/29143400/pharmacokinetics-of-concentrated-naloxone-nasal-spray-for-opioid-overdose-reversal-phase-i-healthy-volunteer-study
#13
Rebecca McDonald, Ulrike Lorch, Jo Woodward, Björn Bosse, Helen Dooner, Gill Mundin, Kevin Smith, John Strang
BACKGROUND AND AIMS: Take-home naloxone can prevent death from heroin/opioid overdose, but pre-provision is difficult because naloxone is usually given by injection. Non-injectable alternatives, including naloxone nasal sprays, are currently being developed. To be effective, the intranasal (i.n.) spray dose must be adequate but not excessive, and early absorption must be comparable to intramuscular (i.m.) injection. We report on the pharmacokinetics (PK) of a specially produced concentrated novel nasal spray...
November 16, 2017: Addiction
https://www.readbyqxmd.com/read/29143283/evaluation-of-sequential-spect-and-ct-for-targeted-radionuclide-therapy-dosimetry
#14
Tiantian Li, Nien-Yun Wu, Na Song, Greta S P Mok
PURPOSE: In targeted radionuclide therapy (TRT), a prior knowledge of the absorbed dose biodistribution is essential for pre-therapy treatment planning. Previously, we showed that non-rigid organ-by-organ registration in sequential quantitative SPECT images improved dose estimation. This study aims to investigate if sequential CT can further improve TRT dosimetric accuracy. METHODS: We simulated SPECT/CT acquisitions at 1, 12, 24, 72 and 144 h In-111 Zevalin post-injection using an analytical MEGP projector, modeling attenuation, scatter and collimator-detector response...
November 15, 2017: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/29143257/environmental-characteristics-and-changes-of-sediment-pore-water-dissolved-organic-matter-in-four-chinese-lakes
#15
Khan M G Mostofa, Wen Li, Fengchang Wu, Cong-Qiang Liu, Haiqing Liao, Li Zeng, Min Xiao
Sediment pore waters were examined in four Chinese lakes (Bosten, Qinghai, Chenghai and Dianchi) to characterise the sources of dissolved organic matter (DOM) and their microbial changes in the sediment depth profiles. Parallel factor (PARAFAC) modelling on the sample fluorescence spectra confirmed that the pore water DOM was mostly composed of two components with a mixture of both allochthonous and autochthonous fulvic acid-like substances in three lakes, except Lake Dianchi, and protein-like components in Lake Bosten...
November 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29143038/optical-nonlinearity-engineering-of-a-bismuth-telluride-saturable-absorber-and-application-of-a-pulsed-solid-state-laser-therein
#16
Yi-Ran Wang, Peng Lee, Bai-Tao Zhang, Yuan-Hua Sang, Jing-Liang He, Hong Liu, Chao-Kuei Lee
Saturable absorbers (SAs) have interesting applications for the realization of pulsed lasers in various wavelengths of fiber and solid-state lasers. Topological insulators (TIs) have been recently discovered to feature saturable absorption due to their unique band structure. In this study, high-purity layers of Bi2Te3 thin film SA have been successfully prepared using the spin coating-coreduction approach (SCCA). Compared with the typical method of preparing SAs, the SCCA can be used to prepare topological insulator saturable absorbers (TISAs) with high optical quality, large area consistency, and controllable thickness, which is critical for pulsed lasers...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29143003/a-mixed-dimensional-light-emitting-diode-based-on-a-p-mos2-nanosheet-and-an-n-cdse-nanowire
#17
Pan Li, Kai Yuan, Der-Yuh Lin, Xiaolong Xu, Yilun Wang, Yi Wan, Haoran Yu, Kun Zhang, Yu Ye, Lun Dai
The construction of the mixed-dimensional van der Waals (vdW) heterostructures with two-dimensional (2D) and one-dimensional (1D) materials can advantageously integrate their respective dimensional properties to produce new device functionalities and/or enhance device performance. In this case, a single semiconductor nanowire (NW) can function as an optical cavity and a gain medium, while the atomically thin 2D material does not strongly absorb the NW's light emission or disturb the optical propagation mode...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29142415/are-polyunsaturated-fatty-acid-metabolites-the-protective-effect-of-4-hydroxytyrosol-on-human-red-blood-cell-membranes-and-oxidative-damage-4-hydroxyalkenals-compatible-in-hypertriglyceridemic-patients
#18
Giuseppe Gallo, Rosalinda Bruno, Adele Taranto, Guglielmo Martino
Background: Increased levels of malondialdehyde (MDA) and 4-hydroxynonenal (HNE) are demonstrated in plasma of uremic patients. A study showed that the comparison of erythrocytes of healthy and diseased patients (obese, hypertensive, and Type 2 diabetics) with age is associated to a disturbed oxidant/antioxidant balance when obesity is associated with hypertension. 4-hydroxytyrosol is shown to significantly protect red blood cells (RBCs) from oxidative damage (4-HNE). In literature, there are partial discussions on the role of lipids and their oxidation products...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142413/antiurolithiatic-potential-of-neeri-against-calcium-oxalate-stones-by-crystallization-inhibition-free-radicals-scavenging-and-nrk-52e-cell-protection-from-oxalate-injury
#19
Parveen Kumar Goyal, Santosh Kumar Verma, Anil Kumar Sharma
Background: Neeri is a well-established polyherbal formulation prescribed for renal stones by the physicians but has not been experimentally evaluated for its antiurolithiatic potential using cell-lines. Objective: This study is aimed to scientifically substantiate the antiurolithiatic effect of Neeri extract (NRE) through calcium oxalate (CaOx) crystallization inhibition, scavenging of free radicals, and protection of renal tubular epithelial NRK-52E cells from oxalate-induced injury...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142018/terahertz-dictating-the-frequency-of-life-do-macromolecular-vibrational-modes-impose-thermal-limitations-on-terrestrial-life
#20
Kieran Hand, Edwin Yates
Conditions on exoplanets include elevated temperatures and pressures. The response of carbon-based biological macromolecules to such conditions is then relevant to the viability of life. The capacity of proteins and ribozymes to catalyse reactions or bind receptors, and nucleic acids to convey information, depends on them sampling different conformational states. These are determined by macromolecular vibrational states, or phonon modes, accessible using terahertz (THz: 10(12)Hz) absorption spectroscopy. THz spectra of biological macromolecules exhibit broad absorption at approximately 6 THz (equating to approx...
November 2017: Journal of the Royal Society, Interface
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