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https://www.readbyqxmd.com/read/29339740/understanding-turbulent-free-surface-vortex-flows-using-a-taylor-couette-flow-analogy
#1
Sean Mulligan, Giovanni De Cesare, John Casserly, Richard Sherlock
Free-surface vortices have long been studied to develop an understanding of similar rotating flow phenomena observed in nature and technology. However, a complete description of its turbulent three-dimensional flow field still remains elusive. In contrast, the related Taylor-Couette flow system has been well explicated which classically exhibits successive instability phases manifested in so-called Taylor vortices. In this study, observations made on the turbulent free-surface vortex revealed distinguishable, time-dependent "Taylor-like" vortices in the secondary flow field similar to the Taylor-Couette flow system...
January 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29335181/enhancing-the-photovoltaic-performance-of-bulk-heterojunction-polymer-solar-cells-by-adding-rhodamine-b-laser-dye-as-co-sensitizer
#2
Sholeh Kazemifard, Leila Naji, Faramarz Afshar Taromi
Ternary blend (TB) strategy has been considered as an effective method to enhance the photovoltaic performance of bulk heterojunction (BHJ) polymer solar cells (PSCs). Here, we report on TB-based PSCs containing two donor materials; poly-3-hexylthiophene (P3HT) and Rhodamine B (RhB) laser organic dye, and [6,6]-phenyl C61 butyric acid methyl ester (PC61BM) as an acceptor. The influence of RhB weight percentage and injection volume was extensively studied. To gain insight into the influences of RhB on the photovoltaic performance of PSCs, physicochemical and optical properties of TBs were compared with those of BHJ binary blend as a standard...
January 5, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29332067/incidence-of-and-risk-factors-for-residual-anastomoses-in-twin-twin-transfusion-syndrome-treated-with-laser-surgery-a-15-year-single-center-experience
#3
P J C Knijnenburg, F Slaghekke, L S A Tollenaar, J M van Klink, D P Zhao, J M Middeldorp, M C Haak, F J Klumper, D Oepkes, E Lopriore
OBJECTIVES: To evaluate the incidence of residual anastomoses (RA) after laser therapy for twin-twin transfusion syndrome (TTS) and investigate risk factors for incomplete laser surgery. MATERIAL AND METHODS: All available TTS placentas treated with laser at our center between 2002 and 2016 were injected with color dye to assess the presence of RA. We evaluated the incidence of RA over the past 15 years by dividing the cohort into three time periods, and studied the association with risk factors and neonatal outcome...
January 12, 2018: Fetal Diagnosis and Therapy
https://www.readbyqxmd.com/read/29329462/silibinin-from-silybum-marianum-stimulates-embryonic-stem-cell-vascular-differentiation-via-the-stat3-pi3-k-akt-axis-and-nitric-oxide
#4
Enas Hussein Ali, Fatemeh Sharifpanah, Maria Wartenberg, Heinrich Sauer
Silibinin, the bioactive compound of milk thistle (Silybum marianum), exerts tissue protective and regenerative effects that may include stem cell differentiation toward vascular cells. The purpose of the present study was to investigate whether silibinin stimulates blood vessel formation from mouse embryonic stem (ES) cells and to unravel the underlying signaling cascade. Vascular branching points were assessed by confocal laser scanning microscopy and computer-assisted image analysis of CD31-positive cell structures...
January 12, 2018: Planta Medica
https://www.readbyqxmd.com/read/29323392/high-q-and-highly-reproducible-microdisks-and-microlasers
#5
Nan Zhang, Yujie Wang, Wenzhao Sun, Shuai Liu, Can Huang, Xiaoshun Jiang, Min Xiao, Shumin Xiao, Qinghai Song
High quality (Q) factor microdisks are fundamental building blocks of on-chip integrated photonic circuits and biological sensors. The resonant modes in microdisks circulate near their boundaries, making their performances strongly dependent upon surface roughness. Surface-tension-induced microspheres and microtoroids are superior to other dielectric microdisks when comparing Q factors. However, most photonic materials such as silicon and negative photoresists are hard to be reflowed and thus the realizations of high-Q microdisks are strongly dependent on electron-beam lithography...
January 11, 2018: Nanoscale
https://www.readbyqxmd.com/read/29316109/a-comparative-study-on-the-photophysics-and-photochemistry-of-xanthene-dyes-in-the-presence-of-pamam-dendrimers
#6
Ernesto Arbeloa, Carlos Mario Previtali, Sonia Graciela Bertolotti
The photophysical and photochemical properties of the xanthene dyes Eosin-Y (Eos), Erythrosin-B (Ery) and Rose Bengal (RB) were evaluated in the presence of amino-terminated polyamido-amine (PAMAM) dendrimers of relatively high generations (G3-G5), in alkaline aqueous solution. UV-Vis absorption and fluorescence spectra of the dyes showed bathochromic shifts, which correlated with the size of the dendrimer. From absorption data binding constant (Kbind) were calculated. High Kbind values resulted, indicating a strong interaction between both molecules...
January 7, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/29311491/visual-evoked-potential-in-rabbits-eyes-with-subretinal-implantation-by-vitrectomy-of-okayama-university-type-retinal-prosthesis-oureptm
#7
Toshihiko Matsuo, Tetsuya Uchida, Koichiro Yamashita, Shigiko Takei, Daisuke Ido, Mamoru Tanaka, Masao Oguchi, Toshinori Furukawa
Okayama University-type retinal prosthesis (OURePTM) is a photoelectric dye-coupled polyethylene film which generates electric potential in response to light and stimulates nearby neurons. This study aims to test surgical feasibility for subretinal film implantation and to examine functional durability of films in subretinal space. Dye-coupled films were implanted subretinally by vitrectomy in the right eye of normal white rabbits: 8 rabbits for 1 month and 8 rabbits for 6 months. The implanted films were removed by vitrectomy in 4 of these 8 rabbits in 1-month or 6-month implantation group...
January 1, 2018: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/29289340/a-sensitive-assay-based-on-specific-aptamer-binding-for-the-detection-of-salmonella-enterica-serovar-typhimurium-in-milk-samples-by-microchip-capillary-electrophoresis
#8
Yan Zhang, Feifei Luo, Yating Zhang, Luqi Zhu, Yi Li, Shuangli Zhao, Pingang He, Qingjiang Wang
The detection of Salmonella enterica serovar Typhimurium (S. Typhimurium) is very important for the prevention of food poisoning and other infectious diseases. Here we reported a simple and sensitive strategy to test S. Typhimurium by microchip capillary electrophoresis couple with laser-induced fluorescence (MCE-LIF) based on the specific reaction between the bacterium and corresponding aptamers. Based on the differences in charge to mass ratio between bacteria-aptamer complexes and free aptamers, a separation of the complexes and free aptamers could be obtained by MCE...
December 23, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29284934/detection-of-adherence-of-enterococcus-faecalis-in-infected-dentin-of-extracted-human-teeth-using-confocal-laser-scanning-microscope-an-in-vitro-study
#9
V Siddharth Nair, Moksha Nayak, M K Ramya, G Sivadas, C Ganesh, S Lakshmi Devi, Vaishnavi Vedam
Aim: The aim of this study is to detect in vitro adherence of Enterococcus faecalis to the infected dentinal tubules of human extracted teeth using confocal laser scanning microscope. Subjects and Methods: Roots from human premolar teeth (n = 40) were infected with E. faecalis strain the American Type Culture Collection 29212 in brain heart infusion for 21 days. After the experimental period, specimens were divided into two groups, Group A (n = 20), Group B (n = 20), and Group A specimens were stained with fluorescein diacetate dye for the detection of viability and adherence Group B were stained with acridine orange dye for detection of metabolic activity and adherence...
November 2017: Journal of Pharmacy & Bioallied Sciences
https://www.readbyqxmd.com/read/29282183/techniques-for-optimizing-surgical-scars-part-2-hypertrophic-scars-and-keloids
#10
Kathryn Potter, Sailesh Konda, Vicky Zhen Ren, Apphia Lihan Wang, Aditya Srinivasan, Suneel Chilukuri
Surgical management of benign or malignant cutaneous tumors may result in noticeable scars that are of great concern to patients, regardless of sex, age, or ethnicity. Techniques to optimize surgical scars are discussed in this three-part review. Part 2 focuses on scar revision for hypertrophic and keloids scars. Scar revision options for hypertrophic and keloid scars include corticosteroids, bleomycin, fluorouracil, verapamil, avotermin, hydrogel scaffold, nonablative fractional lasers, ablative and fractional ablative lasers, pulsed dye laser (PDL), flurandrenolide tape, imiquimod, onion extract, silicone, and scar massage...
2017: Skinmed
https://www.readbyqxmd.com/read/29259315/single-particle-discrimination-of-retroviruses-from-extracellular-vesicles-by-nanoscale-flow-cytometry
#11
Vera A Tang, Tyler M Renner, Anna K Fritzsche, Dylan Burger, Marc-André Langlois
Retroviruses and small EVs overlap in size, buoyant densities, refractive indices and share many cell-derived surface markers making them virtually indistinguishable by standard biochemical methods. This poses a significant challenge when purifying retroviruses for downstream analyses or for phenotypic characterization studies of markers on individual virions given that EVs are a major contaminant of retroviral preparations. Nanoscale flow cytometry (NFC), also called flow virometry, is an adaptation of flow cytometry technology for the analysis of individual nanoparticles such as extracellular vesicles (EVs) and retroviruses...
December 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29247433/emla-cream-does-not-influence-efficacy-and-pain-reduction-during-pulsed-dye-laser-treatment-of-port-wine-stain-a-prospective-side-by-side-comparison
#12
Wenxin Yu, Tianyou Wang, Jiafang Zhu, Yajing Qiu, Hui Chen, Yunbo Jin, Xi Yang, Xiaojie Hu, Lei Chang, Yijie Chen, Gang Ma, Xiaoxi Lin
EMLA cream was developed to reduce pain during pulsed-dye laser (PDL) treatment; however, no standard assessment for the therapeutic outcomes of PDL with EMLA creams thus far available. This comparative, prospective clinical trial evaluates laser efficacy and pain reduction during PDL treatment with EMLA cream for local topical anesthesia. Nineteen patients with untreated port-wine stain (PWS) were treated using PDL and examined in this study. Treatment specifications included Vbeam® PDL (Candela Corp.), 595-nm wavelength, 9 J/cm2 radiant exposure, 0...
December 15, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29242903/interface-bonding-with-corneal-crosslinking-cxl-after-lasik-ex-vivo
#13
Theo G Seiler, Marleen Engler, Eric Beck, Reginald Birngruber, Irene E Kochevar
Purpose: Interface bonding with corneal crosslinking (CXL) after LASIK using two different photosensitizers was studied ex vivo. Methods: A LASIK flap was created in enucleated rabbit eyes using a femtosecond laser. After the dissection, CXL was performed to seal the interface. In one group interface CXL was performed using rose bengal and green light, whereas in a second group riboflavin and UV-A light was used. In both groups irradiance, radiant exposure, dye concentration, and imbibition time was varied...
December 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29242243/an-infrared-dye-conjugated-virus-like-particle-for-the-treatment-of-primary-uveal-melanoma
#14
Rhonda C Kines, Isabella Varsavsky, Sanghamitra Choudhary, Debaditya Bhattacharya, Sean Spring, Roger J McLaughlin, Shin J Kang, Hans E Grossniklaus, Demitrios G Vavvas, Stephen Monks, John R MacDougall, Elisabet de Los Pinos, John T Schiller
The work outlined herein describes AU-011, a novel recombinant papillomavirus-like particle (VLP) drug conjugate and its initial evaluation as a potential treatment for primary uveal melanoma. The VLP is conjugated with a phthalocyanine photosensitizer, IRDye 700DX, that exerts its cytotoxic effect through photo-activation with a near-infrared laser. We assessed the anti-cancer properties of AU-011 in vitro utilizing a panel of human cancer cell lines and in vivo using murine subcutaneous and rabbit orthotopic xenograft models of uveal melanoma...
December 14, 2017: Molecular Cancer Therapeutics
https://www.readbyqxmd.com/read/29236177/effect-of-er-yag-laser-enamel-conditioning-and-moisture-on-the-microleakage-of-a-hydrophilic-sealant
#15
Zeynep Aslı Güçlü, Andrew Paul Hurt, Nazmiye Dönmez, Nichola Jayne Coleman
For a given sealant, successful pit and fissure sealing is principally governed by the enamel conditioning technique and the presence of moisture contamination. A new generation of hydrophilic resin sealants is reported to tolerate moisture. This study investigates the impact of Er:YAG laser pre-conditioning and moisture contamination on the microleakage of a recent hydrophilic sealant. Occlusal surfaces of extracted human molars were either acid etched (n = 30), or successively lased and acid etched (n = 30)...
December 13, 2017: Odontology
https://www.readbyqxmd.com/read/29236044/effect-of-guar-gum-with-sorbitol-coating-on-the-properties-and-oil-absorption-of-french-fries
#16
Bo Jia, Daming Fan, Jinwei Li, Zhenhua Duan, Liuping Fan
This paper investigated the effects of guar gum with sorbitol coating on the oil absorption of French fries by combined dye oil methods, confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM). The results showed that pretreatment of blanching with calcium ions and coating with guar gum and sorbitol could significantly reduce the structural oil (STO) and penetrated surface oil (PSO) of French fries and have no negative effects on its texture and also effectively control the final moisture content (p < 0...
December 13, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29224036/laser-advances-in-the-treatment-of-burn-and-traumatic-scars
#17
Shilpi Khetarpal, Urvashi Kaw, Jeffrey S Dover, Kenneth A Arndt
The realm of scar management is constantly changing. Many factors need to be considered when developing a comprehensive treatment plan, including the nature of the scar and the patient. Scar characteristics can be divided by color, scar type and thickness, and body location. Topical and intralesional agents and light- and laserbased treatments can be used to revitalize and restore damaged skin in atrophic and hypertrophic scars. The most commonly used lasers are the pulsed-dye laser (PDL) and fractional lasers...
December 2017: Seminars in Cutaneous Medicine and Surgery
https://www.readbyqxmd.com/read/29222782/diolistic-labeling-and-analysis-of-dendritic-spines
#18
M Foster Olive, Armani P Del Franco, Cassandra D Gipson
Dendritic spines are diverse and plastic components of the neuronal cell apparatus and are highly responsive to trophic factors during both development and adulthood. Diolistic labeling of neurons with lipophilic fluorescent dyes, coupled with advanced high-resolution microscopy methods, provides robust labeling of dendritic spines for assessment of their density and morphology. Here, we describe a method for labeling of dendritic spines using diolistic labeling in ex vivo brain slices, visualization using confocal laser scanning microscopy, deconvolution, and analysis using the Surpass module of Bitplane Imaris software...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29222172/proximal-aberrant-crypt-foci-associate-with-synchronous-neoplasia-and-are-primed-for-neoplastic-progression
#19
David A Drew, Allen Mo, James J Grady, Richard G Stevens, Joel B Levine, Bruce M Brenner, Joseph C Anderson, Faripour Forouhar, Michael J O'Brien, Thomas J Devers, Daniel W Rosenberg
Aberrant crypt foci (ACF) are the earliest morphologically identifiable lesion found within the human colon. Despite their relatively high frequency in the distal colon, few studies have examined the molecular characteristics of ACF within the proximal colon. In the following study, clinical participants (n=184) were screened for ACF using high-definition chromoendoscopy with contrast dye-spray. Following pathological confirmation, ACF biopsies were subjected to laser-capture microdissection (LCM) and epithelial cells were evaluated for somatic mutations with a customized colorectal cancer mutation panel using DNA-mass spectrometry...
December 8, 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/29221053/ultra-high-speed-plif-imaging-for-simultaneous-visualization-of-multiple-species-in-turbulent-flames
#20
Zhenkan Wang, Panagiota Stamatoglou, Zheming Li, Marcus Aldén, Mattias Richter
In order to obtain more detailed characteristics and information in highly turbulent flames, for a better understanding of the transient behavior of eddies in such flames, a measurement technique with sufficient temporal resolution is requested. However, the probing of species distributions relevant in combustion (e.g. OH, CH2O) with ultra-high-speed laser diagnostics still remains a challenge. Nd:YAG clusters commercially available can generate only 4-8 pulses, although with high laser energy. Systems based on a diode-pumped solid-state Nd:YAG laser combined with a dye laser produce only about 100 μJ pulse energy at ultra-high repetition rates (≥50 kHz)...
November 27, 2017: Optics Express
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