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https://www.readbyqxmd.com/read/28524926/a-980-nm-laser-activated-upconverted-persistent-probe-for-nir-to-nir-rechargeable-in-vivo-bioimaging
#1
Zhenluan Xue, Xiaolong Li, Youbin Li, Mingyang Jiang, Guozhong Ren, Hongrong Liu, Songjun Zeng, Jianhua Hao
Long-lasting persistent luminescent nanoparticles (PLNPs) with efficient near-infrared (NIR) emission have emerged as a new generation of probes for in vivo optical bioimaging owing to their advantages of zero-autofluorescence benefited from the self-sustained emission after excitation, deep penetration depth, and a high signal-to-noise ratio. However, most of the PLNPs are charged by ultraviolet (UV) or visible light, remarkably limiting their applications for in vivo long-term bioimaging. Here we demonstrate 980 nm laser activated upconversion-PLNPs (UC-PLNPs) with efficient NIR emission...
May 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28522858/mapping-anomalous-dispersion-of-air-with-ultrashort-mid-infrared-pulses
#2
A V Mitrofanov, A A Voronin, D A Sidorov-Biryukov, M V Rozhko, E A Stepanov, A B Fedotov, V Shumakova, S Ališauskas, A Pugžlys, A Baltuška, A M Zheltikov
We present experimental studies of long-distance transmission of ultrashort mid-infrared laser pulses through atmospheric air, probing air dispersion in the 3.6-4.2-μm wavelength range. Atmospheric air is still highly transparent to electromagnetic radiation in this spectral region, making it interesting for long-distance signal transmission. However, unlike most of the high-transmission regions in gas media, the group-velocity dispersion, as we show in this work, is anomalous at these wavelengths due to the nearby asymmetric-stretch rovibrational band of atmospheric carbon dioxide...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28518076/facile-preparation-of-ultrafine-aluminum-hydroxide-particles-with-or-without-mesoporous-mcm-41-in-ambient-environments
#3
Viktor Dubovoy, Ravi Subramanyam, Michael Stranick, Laurence Du-Thumm, Long Pan
An aqueous suspension of nanogibbsite was synthesized via the titration of aluminum aqua acid [Al(H2O)6](3+) with L-arginine to pH 4.6. Since the hydrolysis of aqueous aluminum salts is known to produce a wide array of products with a wide range of size distributions, a variety of state-of-the-art instruments (i.e., (27)Al/(1)H NMR, FTIR, ICP-OES, TEM-EDX, XPS, XRD, and BET) were used to characterize the synthesis products and identification of byproducts. The product, which was comprised of nanoparticles (10-30 nm), was isolated using gel permeation chromatography (GPC) column technique...
May 11, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28517962/inhibition-of-the-continuum-of-radiation-induced-normal-tissue-injury-by-a-redox-active-mn-porphyrin
#4
Samuel R Birer, Chen-Ting Lee, Kingshuk Roy Choudhury, Kenneth H Young, Ivan Spasojevic, Ines Batinic-Haberle, James D Crapo, Mark W Dewhirst, Kathleen A Ashcraft
Normal tissue damage after head and neck radiotherapy involves a continuum of pathologic events to the mucosa, tongue and salivary glands. We examined the radioprotective effects of MnBuOE, a redox-active manganese porphyrin, at three stages of normal tissue damage: immediate (leukocyte endothelial cell [L/E] interactions), early (mucositis) and late (xerostomia and fibrosis) after treatment. In this study, mice received 0 or 9 Gy irradiation to the oral cavity and salivary glands ± MnBuOE treatment. Changes in leukocyte-endothelial cell interactions were measured 24 h postirradiation...
May 18, 2017: Radiation Research
https://www.readbyqxmd.com/read/28514717/quantification-of-active-ingredients-in-semi-solid-pharmaceutical-formulations-by-near-infrared-spectroscopy
#5
Lisa B Schlegel, Manfred Schubert-Zsilavecz, Mona Abdel-Tawab
Near infrared (NIR) spectroscopy is increasingly gaining significance in the pharmaceutical industry for quality and in-process control. However, the potential of this method for quantitative quality control in pharmacies has long been neglected and little data is available on its application in analysis of creams and ointments. This study evaluated the applicability of NIR spectrometer with limited wavelength range (1000-1900nm) for quantitative quality control of six different dermatological semi-solid pharmaceutical preparations...
May 6, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28514382/-laser-technologies-in-treatment-of-posttraumatic-rectal-fistulas
#6
N I Mamedov, M M Mamedov
AIM: To assess the results of surgical treatment of posttraumatic rectal fistulas using current laser technology. MATERIAL AND METHODS: Surgical treatment of 134 (10.9%) patients with posttraumatic rectal fistulas was analyzed. The control group of conventional treatment included 58 (43.3±3.4%) patients, the main group - 76 (56.7±3.4%) patients. In the main group we used carbon dioxide laser device 'Lancet-2' (Russia) with a wavelength of 10.6 microns, capacity up to 20 W, and contact laser device 'Atkus-15' (Russia) with a wavelength of 0...
2017: Khirurgiia
https://www.readbyqxmd.com/read/28513723/amphiphilic-coatings-for-the-protection-of-upconverting-nanoparticles-against-dissolution-in-aqueous-media
#7
Olivija Plohl, Slavko Kralj, Boris Majaron, Eleonore Fröhlich, Maja Ponikvar-Svet, Darko Makovec, Darja Lisjak
Upconverting nanoparticles (UCNPs) of β-NaYF4, co-doped with Yb(3+) and Tm(3+) and 21-36 nm large, were synthesized using a modified thermal decomposition method. The as-synthesized UCNPs were coated with oleic acid and dispersed in nonpolar media. Their morphology, size and crystal structure were analysed with transmission electron microscopy and X-ray diffraction. The UCNPs showed a fluorescence emission spectrum characteristic of Tm(3+). Their dissolution in water (pH ∼ 4-5) and phosphate buffered saline (PBS, pH = 7...
May 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28513684/ultrafast-ir-spectroscopy-of-photo-induced-electron-transfer-in-self-assembled-donor-acceptor-coordination-cages
#8
J Ahrens, M Frank, G H Clever, D Schwarzer
Photo-induced processes in self-assembled coordination cages were studied by femtosecond infrared pump-probe spectroscopy. Densely packed, interpenetrated double cages were constructed from eight bis-monodentate redoxactive ligands bound to four Pd(ii) nodes. Two types of ligands consisting of electron rich phenothiazine (PTZ) or electron deficient anthraquinone (ANQ) chromophores were used to assemble either homo-octameric or mixed-ligand cages. Upon photoexcitation the homo-octameric acceptor cage undergoes intersystem crossing to a long-lived triplet state, similar to the free acceptor ligand...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28507898/optically-and-acoustically-triggerable-sub-micron-phase-change-contrast-agents-for-enhanced-photoacoustic-and-ultrasound-imaging
#9
Shengtao Lin, Anant Shah, Javier Hernández-Gil, Antonio Stanziola, Bethany I Harriss, Terry O Matsunaga, Nicholas Long, Jeffrey Bamber, Meng-Xing Tang
We demonstrate a versatile phase-change sub-micron contrast agent providing three modes of contrast enhancement: 1) photoacoustic imaging contrast, 2) ultrasound contrast with optical activation, and 3) ultrasound contrast with acoustic activation. This agent, which we name 'Cy-droplet', has the following novel features. It comprises a highly volatile perfluorocarbon for easy versatile activation, and a near-infrared optically absorbing dye chosen to absorb light at a wavelength with good tissue penetration...
June 2017: Photoacoustics
https://www.readbyqxmd.com/read/28507710/semiconducting-polymer-dots-with-bright-narrow-band-emission-at-800-nm-for-biological-applications
#10
Dandan Chen, I-Che Wu, Zhihe Liu, Ying Tang, Haobin Chen, Jiangbo Yu, Changfeng Wu, Daniel T Chiu
The development of near-infrared (NIR) fluorescent probes is critical for in vivo exploration of the fundamental and complex processes in living systems by noninvasive fluorescence imaging techniques. Semiconducting polymer dots (Pdots) are emerging as important probes that exhibit several advantages, such as high brightness and biocompatibility. However, NIR-emitting Pdots are very rare, particularly at the center (∼800 nm) of the first optical window of biological tissues (between 650 nm and 950 nm). In this paper, we describe the synthesis of a semiconducting polymer with bright and narrow-band emission at 800 nm...
May 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28504126/chemical-modification-of-nanocellulose-with-canola-oil-fatty-acid-methyl-ester
#11
Liqing Wei, Umesh P Agarwal, Kolby C Hirth, Laurent M Matuana, Ronald C Sabo, Nicole M Stark
Cellulose nanocrystals (CNCs), produced from dissolving wood pulp, were chemically functionalized by transesterification with canola oil fatty acid methyl ester (CME). CME performs as both the reaction reagent and solvent. Transesterified CNC (CNCFE) was characterized for their chemical structure, morphology, crystalline structure, thermal stability, and hydrophobicity. Analysis by Fourier transform infrared (FTIR) and FT-Raman spectroscopies showed that the long chain hydrocarbon structure was successfully grafted onto CNC surfaces...
August 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28497817/rechargeable-and-led-activated-znga2o4%C3%A2-%C3%A2-cr-3-near-infrared-persistent-luminescence-nanoprobes-for-background-free-biodetection
#12
Zhihao Zhou, Wei Zheng, Jintao Kong, Yan Liu, Ping Huang, Shanyong Zhou, Zhuo Chen, Jianlin Shi, Xueyuan Chen
Persistent luminescence nanoparticles (PLNPs) have shown great promise in the field of biomedicine, but are currently limited by the challenge in the synthesis of high-quality PLNPs with bright persistent luminescence and a long afterglow time. Herein, we report a facile strategy for the synthesis of monodisperse, rechargeable and LED-activated ZnGa2O4 : Cr(3+) near-infrared (NIR) PLNPs based on a modified solvothermal liquid-solid-solution method. The as-synthesized PLNPs are not only flexible for bioconjugation, but could also circumvent the limitation of the weak persistent luminescence and short afterglow time that most PLNPs confronted owing to their rechargeable capability...
May 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28494305/photovoltage-response-of-xzn-fe2o4-bifeo3-x-mg-mn-or-ni-interfaces-for-highly-selective-cr-3-cd-2-co-2-and-pb-2-ions-detection
#13
Liang Bian, Yu-Jin Li, Jing Li, Jia-Nan Nie, Fa-Qin Dong, Mian-Xin Song, Li-Sheng Wang, Hai-Liang Dong, Hai-Long Li, Xiao-Qin Nie, Xiao-Yan Zhang, Xin-Xi Li, Lei Xie
High-photostability fluorescent (XZn)Fe2O4 (X=Mg, Mn or Ni) embedded in BiFeO3 spinel-perovskite nanocomposites were successfully fabricated via a novel bio-induced phase transfer method using shewanella oneidensis MR-1. These nanocomposites have the near-infrared fluorescence response (XZn or Fe)-O-O-(Bi) interfaces (785/832nm), and the (XZn)Fe2O4/BiFeO3 lattices with high/low potentials (572.15-808.77meV/206.43-548.1meV). Our results suggest that heavy metal ion (Cr(3+), Cd(2+), Co(2+) and Pb(2+)) d↓ orbitals hybridize with the paired-spin X-Zn-Fe d↓-d↓-d↑↓ orbitals to decrease the average polarization angles (-29...
May 1, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28493610/fractionated-aliphatic-alcohols-as-synthetic-precursors-of-ultra-long-chain-monoacylglycerols-for-cosmetic-applications
#14
Bianca Pérez, Bjørn S Hansen, Pallav A Bulsara, Anthony Vincent Rawlings, Martyn J Clarke, Zheng Guo
BACKGROUND: Xerosis is an abnormally dry and flaky skin condition that is associated with a change in the packing behavior of the lipid matrix in the stratum corneum (SC), the outermost layer of the skin. This skin condition can lead to an increase in transepidermal water loss (TEWL). Since ultralong chain fatty acids have a positive effect on maintaining the packing behavior of the SC lipid matrix, a moisturizer which contains glycerides of ultralong chain fatty acids could act as an semi-occlusive layer on the surface of the skin...
May 11, 2017: International Journal of Cosmetic Science
https://www.readbyqxmd.com/read/28488860/flexible-and-highly-photosensitive-electrolyte-gated-organic-transistors-with-ionogel-silver-nanowire-membranes
#15
Haihua Xu, Qingqing Zhu, Ying Lv, Kan Deng, Yinghua Deng, Qiaoliang Li, Suwen Qi, Wenwen Chen, Huisheng Zhang
Flexible and low-voltage photosensors with high near-infrared (NIR) sensitivity are critical for the realization of interacting humans with robots and environments by thermal imaging or night vision techniques. In this work, we for the first time develop an easy and cost-effective process to fabricate flexible and ultra-thin electrolyte-gated organic phototransistors (EGOPTs) with high transparent nanocomposite membranes involved of high-conductivity silver nanowire (AgNW) networks and large-capacitance iontronic films...
May 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28488428/contribution-of-charges-in-polyvinyl-alcohol-networks-to-marine-antifouling
#16
Wufang Yang, Peng Lin, Daocang Cheng, Longzhou Zhang, Yang Wu, Yupeng Liu, Xiaowei Pei, Feng Zhou
Semi-interpenetrated polyvinyl alcohol polymer networks (SIPNs) were prepared by integrating various charged components into polyvinyl alcohol polymer. Contact angle measurement, attenuated total reflection fourier transform infrared spectroscopy (ART-FTIR), field emission scanning electron microscope (FE-SEM) and tensile tests were used to characterize the physicochemical properties of the prepared SIPNs. In order to investigate the contribution of charges to the marine antifouling, the adhesion behaviors of green alga D...
May 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28483012/synthesis-and-characterization-of-polyamidoamine-dendrimers-nano-hydroxyapatite-and-its-role-in-dentin-tubule-occlusion
#17
Xuandong Lin, Fangfang Xie, Yuhong Hao, Hejia Qin, Jindong Long
Objective To synthesis and characterization nano-composite biomaterials-polyamidoamine dendrimers/nano-hydroxyapatite (PAMAM/n-HAP),which has the properties of both organic and inorganic materials,and then evaluate its role in dentin tubule occlusion. Methods PAMAM/n-HAP was characterized and validated by Fourier transform infrared spectrometry and transmission electron microscopy after its preparation via the Pramanik aqueous-based chemical method. Scanning electron microscope was used to evaluate its role in dentin tublule occlusion...
April 20, 2017: Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae
https://www.readbyqxmd.com/read/28481301/convolutional-neural-network-based-human-detection-in-nighttime-images-using-visible-light-camera-sensors
#18
Jong Hyun Kim, Hyung Gil Hong, Kang Ryoung Park
Because intelligent surveillance systems have recently undergone rapid growth, research on accurately detecting humans in videos captured at a long distance is growing in importance. The existing research using visible light cameras has mainly focused on methods of human detection for daytime hours when there is outside light, but human detection during nighttime hours when there is no outside light is difficult. Thus, methods that employ additional near-infrared (NIR) illuminators and NIR cameras or thermal cameras have been used...
May 8, 2017: Sensors
https://www.readbyqxmd.com/read/28481104/effect-of-morphology-and-size-of-halloysite-nanotubes-on-functional-pectin-bionanocomposites-for-food-packaging-applications
#19
Maziyar Makaremi, Pooria Pasbakhsh, Giuseppe Cavallaro, Giuseppe Lazzara, Yoong Kit Aw, Sui Mae Lee, Stefana Milioto
Pectin bionanocomposite films filled with various concentrations of two different types of halloysite nanotubes were prepared and characterized in this study as potential films for food packaging applications. The two types of halloysite nanotubes were long and thin (patch) (200 nm to 30,000 nm length) and short and stubby (Matauri Bay) (50 to 3000 nm length) with different morphological, physical and dispersability properties. Both matrix (pectin) and reinforcers (halloysite nanotubes) which used in this study are considered as biodegradable, natural and low cost materials...
May 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28471110/rapid-quantification-of-multi-components-in-alcohol-precipitation-liquid-of-codonopsis-radix-using-near-infrared-spectroscopy-nirs
#20
Yu Luo, Wen-Long Li, Wen-Hua Huang, Xue-Hua Liu, Yan-Gang Song, Hai-Bin Qu
A near infrared spectroscopy (NIRS) approach was established for quality control of the alcohol precipitation liquid in the manufacture of Codonopsis Radix. By applying NIRS with multivariate analysis, it was possible to build variation into the calibration sample set, and the Plackett-Burman design, Box-Behnken design, and a concentrating-diluting method were used to obtain the sample set covered with sufficient fluctuation of process parameters and extended concentration information. NIR data were calibrated to predict the four quality indicators using partial least squares regression (PLSR)...
May 2017: Journal of Zhejiang University. Science. B
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