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https://www.readbyqxmd.com/read/29143263/enhanced-stabilization-of-pb-zn-and-cd-in-contaminated-soils-using-oxalic-acid-activated-phosphate-rocks
#1
Zhuo Zhang, Guanlin Guo, Mei Wang, Jia Zhang, Zhixin Wang, Fasheng Li, Honghan Chen
Phosphate amendments, especially phosphate rock (PR), are one of the most commonly used materials to stabilize heavy metals in contaminated soils. However, most of PR reserve consists of low-grade ore, which limits the efficiency of PR for stabilizing heavy metals. This study was to enhance the stabilization of heavy metals through improving the available phosphorous (P) release of PR by oxalic acid activation. Raw PR and activated PR (APR) were characterized by scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), X-ray powder diffraction (XRD), Brunauer-Emmett-Teller (BET) surface analysis, and laser diffraction to determine the changes of structure and composition of APR...
November 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29141056/in-vivo-histological-analysis-of-a-fractional-co2-laser-system-intended-for-treatment-of-soft-tissue
#2
Elisabeth Hurliman, Brian Zelickson, Jeffrey Kenkel
<p>BACKGROUND: Fractional ablative lasers have been shown to be safe and effective for improving wrinkles, scars, skin texture, and dyspigmentation. However, the exact effects of this technology in vivo on epidermal and dermal skin constituents have not been delineated. This study evaluated the in vivo histological effects over time of treatment with a fractional ablative CO2 system, using different treatment parameters. MATERIALS AND METHODS: Healthy adult volunteers were enrolled in this multicenter clinical study...
November 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/29141055/treatment-of-photoaging-with-a-dual-wavelength-532-nm-and-1-064-nm-picosecond-domain-laser-producing-a-fractionated-treatment-beam-using-a-holographic-optic
#3
Eric F Bernstein, Kevin T Schomacker, Amit S Paranjape, Jayant D Bhawalkar
<p>BACKGROUND: A dual-wavelength, picosecond-domain, fractionated laser delivering 1,064nm and 532nm laser energy through a holographic optic was investigated for safety and effectiveness at improving the appearance of chronic photoaging. MATERIALS AND METHODS: A total of 27 subjects were enrolled with 24 completing the study, and 14 subjects were treated with 1,064 nm and 10 with 532 nm. The 1,064 nm-treated subjects received 5 monthly treatments while the 532 nm-treated subjects received 4 monthly treatments...
November 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/29140866/one-thousand-five-hundred-fifty-nanometer-erbium-doped-nonablative-fractional-laser-for-the-treatment-of-striae-distensae-in-patients-of-skin-of-color-fitzpatrick-skin-types-iv-vi
#4
Kelly K Park, Erin Roberts, Rebecca C Tung
No abstract text is available yet for this article.
November 14, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/29139245/evaluation-of-a-pointwise-microcirculation-assessment-method-using-liquid-and-multilayered-tissue-simulating-phantoms
#5
Ingemar Fredriksson, Rolf B Saager, Anthony J Durkin, Tomas Strömberg
A fiber-optic probe-based instrument, designed for assessment of parameters related to microcirculation, red blood cell tissue fraction (fRBC), oxygen saturation (SO2), and speed resolved perfusion, has been evaluated using state-of-the-art tissue phantoms. The probe integrates diffuse reflectance spectroscopy (DRS) at two source-detector separations and laser Doppler flowmetry, using an inverse Monte Carlo method for identifying the parameters of a multilayered tissue model. Here, we characterize the accuracy of the DRS aspect of the instrument using (1) liquid blood phantoms containing yeast and (2) epidermis-dermis mimicking solid-layered phantoms fabricated from polydimethylsiloxane, titanium oxide, hemoglobin, and coffee...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29138062/topical-calcipotriol-prior-to-ablative-fractional-laser-assisted-photodynamic-therapy-enhances-treatment-outcomes-for-actinic-keratosis-in-fitzpatrick-grades-iii-v-skin-a-prospective-randomized-clinical-trial
#6
Jeong-Wan Seo, Ki-Hoon Song
No abstract text is available yet for this article.
November 11, 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/29137198/water-based-suspensions-of-iron-oxide-nanoparticles-with-electrostatic-or-steric-stabilization-by-chitosan-fabrication-characterization-and-biocompatibility
#7
Galina V Kurlyandskaya, Larisa S Litvinova, Alexander P Safronov, Valeria V Schupletsova, Irina S Tyukova, Olga G Khaziakhmatova, Galina B Slepchenko, Kristina A Yurova, Elena G Cherempey, Nikita A Kulesh, Ricardo Andrade, Igor V Beketov, Igor A Khlusov
Present day biomedical applications, including magnetic biosensing, demand better understanding of the interactions between living systems and magnetic nanoparticles (MNPs). In this work spherical MNPs of maghemite were obtained by a highly productive laser target evaporation technique. XRD analysis confirmed the inverse spinel structure of the MNPs (space group Fd-3m). The ensemble obeyed a lognormal size distribution with the median value 26.8 nm and dispersion 0.362. Stabilized water-based suspensions were fabricated using electrostatic or steric stabilization by the natural polymer chitosan...
November 13, 2017: Sensors
https://www.readbyqxmd.com/read/29136815/quantitative-study-of-zinc-and-metallothioneins-in-the-human-retina-and-rpe-cells-by-mass-spectrometry-based-methodologies
#8
Sara Rodríguez-Menéndez, Beatriz Fernández, Montserrat García, Lydia Álvarez, Maria Luisa Fernández, Alfredo Sanz-Medel, Miguel Coca-Prados, Rosario Pereiro, Héctor González-Iglesias
The retina contains the highest concentration of zinc in the human eye and it is primarily associated with the retinal pigment epithelium (RPE). Metallothioneins (MTs) are the main cytosolic zinc-ion-binding proteins, exerting a tight control in the number of atoms of Zn-bound to the MTs related with their antioxidant and neuroprotective functions. In order to study the Zn-MT system in retina and RPE, we have implemented mass spectrometry (MS)-based technologies: two complementary element detection methodologies (HPLC- and laser ablation (LA)-ICP-MS) have been successfully employed to study metal content in the human eye as well as to perform speciation studies of Zn-MTs...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29135036/prospective-studies-of-the-efficacy-and-safety-of-the-picosecond-755-1-064-and-532%C3%A2-nm-lasers-for-the-treatment-of-infraorbital-dark-circles
#9
Monique J Vanaman Wilson, Isabela T Jones, Joanna Bolton, Lisa Larsen, Douglas C Wu, Mitchel P Goldman
BACKGROUND: Infraorbital dark circles result from a combination of factors. The fractionated picosecond 755 nm alexandrite laser and dual wavelength picosecond Nd:YAG laser have not been examined as a method of addressing infraorbital hyperpigmentation. OBJECTIVE: To determine the efficacy and safety of treatment of infraorbital dark circles using fractionated picosecond 755 nm and dual wavelength picosecond Nd:YAG laser. METHODS AND MATERIALS: These trials did not utilize a comparative design; rather, these were separate, prospective, open-label, evaluator-blinded trials utilizing two treatment regimens: (i) 19 adult subjects were treated in a single session with the dual wavelengths of 532 nm and 1,064 nm in consecutive passes using the fractionated lens; (ii) 10 adult subjects were treated using the picosecond 755 nm laser via the fractionated lens in three treatment sessions at 3 week intervals...
November 14, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/29125304/homogeneous-nucleation-of-ice-in-transiently-heated-supercooled-liquid-water-films
#10
Yuntao Xu, Nikolay G Petrik, R Scott Smith, Bruce D Kay, Greg A Kimmel
We have investigated the nucleation and growth of crystalline ice in 0.24 μm thick, supercooled water films adsorbed on Pt(111). The films were transiently heated with ∼10 ns infrared laser pulses, which produced typical heating and cooling rates of ∼10(9)-10(10) K/s. The crystallization of these water films was monitored with infrared spectroscopy. The experimental conditions were chosen to suppress ice nucleation at both the water/metal and water/vacuum interfaces. Furthermore, internal pressure increases due to curvature effects are precluded in these flat films...
November 13, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29123137/high-fraction-brookite-films-from-amorphous-precursors
#11
James E S Haggerty, Laura T Schelhas, Daniil A Kitchaev, John S Mangum, Lauren M Garten, Wenhao Sun, Kevin H Stone, John D Perkins, Michael F Toney, Gerbrand Ceder, David S Ginley, Brian P Gorman, Janet Tate
Structure-specific synthesis processes are of key importance to the growth of polymorphic functional compounds such as TiO2, where material properties strongly depend on structure as well as chemistry. The robust growth of the brookite polymorph of TiO2, a promising photocatalyst, has been difficult in both powder and thin-film forms due to the disparity of reported synthesis techniques, their highly specific nature, and lack of mechanistic understanding. In this work, we report the growth of high-fraction (~95%) brookite thin films prepared by annealing amorphous titania precursor films deposited by pulsed laser deposition...
November 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29122045/field-dependent-measurement-of-gaas-composition-by-atom-probe-tomography
#12
Enrico Di Russo, Ivan Blum, Jonathan Houard, Gérald Da Costa, Didier Blavette, Lorenzo Rigutti
The composition of GaAs measured by laser-assisted atom probe tomography may be inaccurate depending on the experimental conditions. In this work, we assess the role of the DC field and the impinging laser energy on such compositional bias. The DC field is found to have a major influence, while the laser energy has a weaker one within the range of parameters explored. The atomic fraction of Ga may vary from 0.55 at low-field conditions to 0.35 at high field. These results have been interpreted in terms of preferential evaporation of Ga at high field...
November 10, 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/29111604/a-comparitive-study-with-a-755%C3%A2-nm-picosecond-alexandrite-laser-with-a-diffractive-lens-array-and-a-532%C3%A2-nm-1-064%C3%A2-nm-nd-yag-with-a-holographic-optic
#13
Emil Tanghetti, John Jennings
BACKGROUND AND OBJECTIVES: This study was performed to better understand the cutaneous effects of using a fractional picosecond laser at 755 nm with a diffractive lens array and a picosecond Nd:YAG laser at 532 mn and 1,064 nm with a holographic optic. We characterized the injuries created by these devices on skin clinically and histologically over 24 hours. With this information we modeled the effects of these devices on a cutaneous target. METHODS: Eight patients, representing Fitzpatrick skin types I-VI, were treated on their backs with a picosecond Alexandrite laser with a diffractive lens array, as well as a picosecond Nd:YAG laser at 532 nm and 1,064 nm with a holographic optic...
November 7, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/29110125/-laser-assisted-blepharoplasty
#14
REVIEW
R Thiesmann
Blepharoplasty is one of the most frequently performed plastic cosmetic interventions. For this purpose the CO2 laser is an instrument that can be used as a laser scalpel to cut as well as in its ablative function to remove skin irregularities, such as scars and tumors and also to treat changes of the skin due to aging. Fractionated laser irradiation reduces the duration of skin redness and the postoperative rehabilitation time after a resurfacing. The advantages of the CO2 laser are a gentle intraoperative preparation and less postoperative swelling due to an additional cauterization of blood vessels...
November 6, 2017: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
https://www.readbyqxmd.com/read/29110015/fractional-carbon-dioxide-laser-as-an-add-on-treatment-for-vitiligo-a-meta-analysis-with-systematic-review
#15
Hyun Jung Kim, Eun Sun Hong, Sang Hyun Cho, Jeong Deuk Lee, Hei Sung Kim
Treatment of vitiligo is challenging and requires a multidisciplinary approach. Fractional carbon dioxide (CO2) laser as an add-on to conventional treatment has been reported to be effective, but there is no consensus on its use. A systematic review was performed by searching major databases for relevant publications to February 2017. Six studies with 85 participants were included. For those with refractory vitiligo, the addition of fractional CO2 laser to routine treatment modalities was superior to conventional treatment alone in terms of > 50% re-pigmentation (relative risk (RR) 4...
November 7, 2017: Acta Dermato-venereologica
https://www.readbyqxmd.com/read/29109285/limiting-zero-load-speed-of-the-rotary-motor-of-escherichia-coli-is-independent-of-the-number-of-torque-generating-units
#16
Bin Wang, Rongjing Zhang, Junhua Yuan
Rotation of the bacterial flagellar motor is driven by multiple torque-generating units (stator elements). The torque-generating dynamics can be understood in terms of the "duty ratio" of the stator elements, that is, the fraction of time a stator element engages with the rotor during its mechanochemical cycle. The dependence of the limiting speed (zero-load speed) of the motor on the number of stator elements is the determining test of the duty ratio, which has been controversial experimentally and theoretically over the past decade...
November 6, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29104812/evaluation-of-the-co2-laser-therapy-on-vulvo-vaginal-atrophy-vva-in-oncological-patients-preliminary-results
#17
Isabella Pagano, Stefania Gieri, Francesca Nocera, Giuseppe Scibilia, Filippo Fraggetta, Antonio Galia, Mauro Gioè, Basilio Pecorino, Paolo Scollo
Objective: To evaluate the impact of fractionated CO2 laser therapy on vaginal atrophy and mild/moderate stress urinary incontinence (SUI) symptoms in patients with physiological or surgically-induced menopause. Materials and Methods: Post-menopausal patients (n = 33) presenting vaginal atrophy and/or SUI, underwent three vaginal CO2 laser treatment sessions, performed at 1-month intervals. Vaginal symptoms were evaluated using the Vaginal Health Index Score (VHI-S), Visual Analogue Scales (VAS) for dyspareunia and global patient satisfaction...
May 2017: Journal of Cancer Therapy
https://www.readbyqxmd.com/read/29093762/eddy-covariance-carbonyl-sulphide-flux-measurements-with-a-quantum-cascade-laser-absorption-spectrometer
#18
Katharina Gerdel, Felix Maximilian Spielmann, Albin Hammerle, Georg Wohlfahrt
The trace gas carbonyl sulphide (COS) has lately received growing interest in the eddy covariance (EC) community due to its potential to serve as an independent approach for constraining gross primary production and canopy stomatal conductance. Thanks to recent developments of fast-response high-precision trace gas analysers (e.g. quantum cascade laser absorption spectrometers (QCLAS)), a handful of EC COS flux measurements have been published since 2013. To date, however, a thorough methodological characterisation of QCLAS with regard to the requirements of the EC technique and the necessary processing steps has not been conducted...
September 26, 2017: Atmospheric Measurement Techniques
https://www.readbyqxmd.com/read/29091667/measurement-of-atmospheric-carbon-dioxide-and-water-vapor-in-built-up-urban-areas-in-the-gandhinagar-ahmedabad-region-in-india-using-a-portable-tunable-diode-laser-spectroscopy-system
#19
Anirban Roy, Neetesh Kumar Sharma, Arup Lal Chakraborty, Abhishek Upadhyay
This paper reports open-path in situ measurements of atmospheric carbon dioxide at Gandhinagar (23.2156°N, 72.6369°E) and Ahmedabad (23.0225°N, 72.5714°E) in the heavily industrialized state of Gujarat in western India. Calibration-free second harmonic wavelength modulation spectroscopy (2f WMS) is used to carry out accurate and fully automated measurements. The mean values of the mole fraction of carbon dioxide at four locations were 438 ppm, 495 ppm, 550 ppm, and 740 ppm, respectively. These values are much higher than the current global average of 406...
November 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29091649/fractional-airy-beams
#20
S N Khonina, A V Ustinov
Airy beams possess a number of properties that ensure their multifunction and high relevance in many applications. This fact stimulates scientists to search for new modifications and generalizations of classical Airy beams. Several generalizations of the Airy functions are known, on the basis of both the modification of the differential equation and the variations in the integral representation. In this paper we propose and investigate a new type of Airy beams-fractional Airy beams (FrAiB). They are based on the generalization of the integral representation and are close to the Olver functions, but we are considering a wider range of the power-law dependence of the argument, including non-integer (fractional) values of the power...
November 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
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