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https://www.readbyqxmd.com/read/28213875/vehicle-type-affects-filling-of-fractional-laser-ablated-channels-imaged-by-optical-coherence-tomography
#1
Uffe Høgh Olesen, Mette Mogensen, Merete Haedersdal
Ablative fractional laser (AFXL) is an emerging method that enhances topical drug delivery. Penetrating the skin in microscopic, vertical channels, termed microscopic treatment zones (MTZs), the fractional technique circumvents the skin barrier and allows increased uptake of topically applied drugs. This study aims to elucidate the impact of vehicle type on the filling of MTZs from application of liquid, gel, and cream vehicles. Ex vivo pig skin was exposed to 10,600 nm fractional CO2 laser at 5% density, 120 μm beam diameter, and fluences of 40 and 80 mJ/microbeam (mJ/mb)...
February 17, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28213553/automated-cell-tracking-identifies-mechanically-oriented-cell-divisions-during-drosophila-axis-elongation
#2
Michael F Z Wang, Miranda Hunter, Gang Wang, Christopher McFaul, Christopher M Yip, Rodrigo Fernandez-Gonzalez
Embryos extend their anterior-posterior (AP) axis in the conserved process of axis elongation. Drosophila axis elongation occurs in an epithelial monolayer, the germband, and is driven by cell intercalation, cell shape changes, and oriented cell divisions at the posterior germband. Anterior germband cells also divide during axis elongation. We developed image analysis and pattern recognition methods to track dividing cells from confocal microscopy movies in a generally-applicable approach. Mesectoderm cells, forming the ventral midline, divided parallel to the AP axis, while lateral cells displayed a uniform distribution of division orientations...
February 17, 2017: Development
https://www.readbyqxmd.com/read/28213499/geometry-and-network-connectivity-govern-the-mechanics-of-stress-fibers
#3
Elena Kassianidou, Christoph A Brand, Ulrich S Schwarz, Sanjay Kumar
Actomyosin stress fibers (SFs) play key roles in driving polarized motility and generating traction forces, yet little is known about how tension borne by an individual SF is governed by SF geometry and its connectivity to other cytoskeletal elements. We now address this question by combining single-cell micropatterning with subcellular laser ablation to probe the mechanics of single, geometrically defined SFs. The retraction length of geometrically isolated SFs after cutting depends strongly on SF length, demonstrating that longer SFs dissipate more energy upon incision...
February 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28213097/self-assembled-tumor-targeting-hyaluronic-acid-nanoparticles-for-photothermal-ablation-in-orthotopic-bladder-cancer
#4
Tingsheng Lin, Ahu Yuan, Xiaozhi Zhao, Huibo Lian, Junlong Zhuang, Wei Chen, Qing Zhang, Guangxiang Liu, Shiwei Zhang, Wei Chen, Wenmin Cao, Chengwei Zhang, Jinhui Wu, Yiqiao Hu, Hongqian Guo
: Bladder cancer is one of the most frequent malignancies in the urinary system. Radical cystectomy is inevitable when bladder cancer progresses to a muscle-invasive disease. However, cystectomy still causes a high risk of death and a low quality of life (such as ureter-abdomen ostomy, uroclepsia for ileal-colon neobladder). Therefore, more effective treatments as well as bladder preservation are needed. We developed self-assembled tumor-targeting hyaluronic acid-IR-780 nanoparticles for photothermal ablation in over-expressing CD44 (the receptor for HA) bladder cancer, which show high tumor selectivity, high treatment efficacy, good bioavailability, and excellent biocompatibility...
February 14, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28212817/in-vivo-toxicity-of-copper-oxide-lead-oxide-and-zinc-oxide-nanoparticles-acting-in-different-combinations-and-its-attenuation-with-a-complex-of-innocuous-bio-protectors
#5
Ilzira A Minigalieva, Boris A Katsnelson, Vladimir G Panov, Larisa I Privalova, Anatoly N Varaksin, Vladimir B Gurvich, Marina P Sutunkova, Vladimir Ya Shur, Ekaterina V Shishkina, Irene E Valamina, Ilya V Zubarev, Oleg H Makeyev, Ekaterina Y Meshtcheryakova, Svetlana V Klinova
Stable suspensions of metal oxide nanoparticles (Me-NPs) obtained by laser ablation of 99.99% pure copper, zinc or lead under a layer of deionized water were used separately, in three binary combinations and a triple combination in two independent experiments on rats. In one of the experiments the rats were instilled with Me-NPs intratracheally (i.t.) (for performing a broncho-alveolar lavage in 24hrs to estimate the cytological and biochemical indices of the response of the lower airways), while in the other, Me-NPs were repeatedly injected intraperitoneally (i...
February 14, 2017: Toxicology
https://www.readbyqxmd.com/read/28210823/non-ablative-erbium-yag-laser-for-the-treatment-of-type-iii-stress-urinary-incontinence-intrinsic-sphincter-deficiency
#6
Adrian Gaspar, Hugo Brandi
The objective of this pilot study was to determine the safety and efficacy of a new non-ablative erbium YAG laser procedure for the treatment of type III stress urinary incontinence (intrinsic sphincter deficiency) in women. Twenty-two patients with a Valsalva leak point pressure less than 60 cm H2O were recruited and treated with a non-ablative erbium laser delivering low fluence pulses inside the whole length of the urethra through a specially designed cannula. Treatment consisted of two treatment sessions with a 3-week interval in-between...
February 16, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28209454/treatment-of-carcinoma-in-situ-of-the-glans-penis-with-topical-imiquimod-followed-by-carbon-dioxide-laser-excision
#7
Tullio Torelli, Mario A Catanzaro, Nicola Nicolai, Patrizia Giannatempo, Andrea Necchi, Daniele Raggi, Biagio Paolini, Maurizio Colecchia, Luigi Piva, Davide Biasoni, Silvia Stagni, Antonio Tesone, Roberto Salvioni
BACKGROUND: Different approaches have been described in published studies for carcinoma in situ (CIS) of the glans penis (erythroplasia of Queyrat), including topical chemotherapy or immunotherapy and laser or surgical excision. We evaluated the efficacy of topical imiquimod (IQ) followed by carbon dioxide laser ablation of the lesion. PATIENTS AND METHODS: From 2010 to 2015, 10 patients affected by CIS of the glans were treated by IQ, followed by carbon dioxide laser ablation...
January 18, 2017: Clinical Genitourinary Cancer
https://www.readbyqxmd.com/read/28207886/connective-tissue-growth-factor-is-not-necessary-for-haze-formation-in-excimer-laser-wounded-mouse-corneas
#8
Xiaodi Feng, Liya Pi, Sriniwas Sriram, Gregory S Schultz, Daniel J Gibson
We sought to determine if connective tissue growth factor (CTGF) is necessary for the formation of corneal haze after corneal injury. Mice with post-natal, tamoxifen-induced, knockout of CTGF were subjected to excimer laser phototherapeutic keratectomy (PTK) and the corneas were allowed to heal. The extent of scaring was observed in non-induced mice, heterozygotes, and full homozygous knockout mice and quantified by macrophotography. The eyes from these mice were collected after euthanization for re-genotyping to control for possible Cre-mosaicism...
2017: PloS One
https://www.readbyqxmd.com/read/28202603/tension-regulates-myosin-dynamics-during-drosophila-embryonic-wound-repair
#9
Anna B Kobb, Teresa Zulueta-Coarasa, Rodrigo Fernandez-Gonzalez
Embryos repair epithelial wounds rapidly in a process driven by collective cell movements. Upon wounding, actin and the molecular motor non-muscle myosin II are redistributed in the cells adjacent to the wound, forming a supracellular purse string around the lesion. Purse string contraction coordinates cell movements and drives rapid wound closure. By using fluorescence recovery after photobleaching in Drosophila embryos, we found that myosin turns over as the purse string contracts. Myosin turnover at the purse string was slower than in other actomyosin networks that had a lower level of contractility...
February 15, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28199998/delayed-intraparenchymal-and-intraventricular-hemorrhage-requiring-surgical-evacuation-after-mri-guided-laser-interstitial-thermal-therapy-for-lesional-epilepsy
#10
Sean M Barber, Luke Tomycz, Timothy George, Dave F Clarke, Mark Lee
BACKGROUND: Symptomatic intracranial hemorrhage is a rare complication of laser interstitial thermal therapy (LITT). OBJECTIVES: To present a unique case of delayed symptomatic intracranial hemorrhage occurring after a LITT procedure for epilepsy in a high-volume center (68 LITT procedures for pediatric epilepsy have been performed). METHODS: An 18-year-old male with epilepsy underwent LITT to an area of heterotopia near the right lateral ventricle...
February 16, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28199463/effect-of-methyl-aminolevulinate-photodynamic-therapy-with-and-without-ablative-fractional-laser-treatment-in-patients-with-microinvasive-squamous-cell-carcinoma-a-randomized-clinical-trial
#11
Seung-Hwan Choi, Ki-Ho Kim, Ki-Hoon Song
Importance: Surgical excision is the standard treatment for cutaneous squamous cell carcinoma (SCC). However, microinvasive SCC (Clark level II) is limited to the papillary dermis, and it should be differentiated from invasive SCC. Ablative fractional laser-primed photodynamic therapy (AFL-PDT) may have enhanced efficacy. Objective: To compare 1 session of AFL-PDT with 2 sessions of conventional methyl aminolevulinate-PDT (MAL-PDT) for the treatment of microinvasive SCC...
February 15, 2017: JAMA Dermatology
https://www.readbyqxmd.com/read/28198840/laboratory-simulation-of-laser-propagation-through-plasma-sheaths-containing-ablation-particles-of-zrb-sub-2-sub-sic-c-during-hypersonic-flight
#12
Qing Zang, Xiangxing Bai, Ping Ma, Jie Huang, Jing Ma, Siyuan Yu, Hongyan Shi, Xiudong Sun, Yang Liu, Yueguang Lu
The optical communication method has potential for solving the blackout problem, which is a big challenge faced in the development of aerospace. Two laser transmission systems were set up to explore the influence of the plasma and the ablation particles on the propagation of the laser. The experimental results indicate that the laser can transmit through the plasma with little attenuation. When there are ablation particles of ZrB<sub>2</sub>-SiC-C added in the plasma, the intensity of the laser has fluctuations...
February 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28197998/laser-assisted-subepithelial-keratectomy-lasek-versus-laser-assisted-in-situ-keratomileusis-lasik-for-correcting-myopia
#13
REVIEW
Jocelyn Kuryan, Anjum Cheema, Roy S Chuck
BACKGROUND: Near-sightedness, or myopia, is a condition in which light rays entering the eye along the visual axis focus in front of the retina, resulting in blurred vision. Myopia can be treated with spectacles, contact lenses, or refractive surgery. Options for refractive surgery include laser-assisted subepithelial keratectomy (LASEK) and laser-assisted in-situ keratomileusis (LASIK). Both procedures utilize a laser to shape the corneal tissue (front of the eye) to correct refractive error, and both create flaps before laser treatment of corneal stromal tissue...
February 15, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28196805/cell-division-and-cadherin-mediated-adhesion-regulate-lens-epithelial-cell-movement-in-zebrafish
#14
Toshiaki Mochizuki, Yi-Jyun Luo, Hsieh-Fu Tsai, Akane Hagiwara, Ichiro Masai
In vertebrates, lens epithelial cells cover the anterior half of the lens fiber core. During development, lens epithelial cells proliferate, move posteriorly and differentiate into lens fiber cells after passing through the equator. To elucidate the mechanisms underlying lens epithelial cell movement, we conducted time-lapse imaging of zebrafish lens epithelium. Lens epithelial cells do not intermingle but maintain their relative positions during development. Cell division induces epithelial rearrangement, which subsequently promotes cell movement towards the equator...
February 15, 2017: Development
https://www.readbyqxmd.com/read/28196456/toxicity-of-internalized-laser-generated-pure-silver-nanoparticles-to-the-isolated-rat-hippocampus-cells
#15
Canan Kursungoz, Sadık Taşkın Taş, Mustafa F Sargon, Yıldırım Sara, Bülend Ortaç
Silver nanoparticles (AgNPs) are the most commonly used nanoparticles (NPs) in medicine, industry and cosmetics. They are generally considered as biocompatible. However, contradictory reports on their biosafety render them difficult to accept as 'safe'. In this study, we evaluated the neurotoxicity of direct AgNP treatment in rat hippocampal slices. We produced pure uncoated AgNPs by a pulsed laser ablation method. NP characterization was performed by Ultraviolet (UV) visible spectrophotometer, scanning electron microscope, transmission electron microscope (TEM) and energy-dispersive X-ray spectroscopy...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/28195845/an-analysis-of-laser-therapy-for-the-treatment-of-nonmelanoma-skin-cancer
#16
Teo Soleymani, Michael Abrouk, Kristen M Kelly
BACKGROUND: Skin cancer remains the most prevalent type of cancer in the United States, and its burden on the health care system remains substantial. Standard treatments such as cryosurgery, electrodessication and curettage, topical and photodynamic therapies, and surgical excision including Mohs micrographic surgery are not without inherent morbidity, including risk of bleeding, infection, and scar. OBJECTIVE: Lasers may be an alternative for treatment of nonmelanoma skin cancer, and this paper reviews this therapeutic option...
February 9, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28195738/thorium-and-uranium-hydride-phosphorus-and-arsenic-bearing-molecules-with-single-and-double-actinide-pnictogen-and-bridged-agostic-hydrogen-bonds
#17
Lester Andrews, Han-Gook Cho, K Sahan Thanthiriwatte, David A Dixon
Thorium atoms from laser ablation react with phosphine during condensation in excess argon to produce two new infrared absorptions at 1467.2 and 1436.6 cm(-1) near weak bands for ThH and ThH2, which increase on annealing to 25 and 30 K, indicating spontaneous reactions. Analogous experiments with uranium produced two similar bands at 1473.4 and 1456.7 cm(-1) above UH at 1423.8 cm(-1) and another absorption at 1388.2 cm(-1). Electronic structure calculations at the coupled cluster CCSD(T) for Th and density functional theory calculations for U as well as their proximity to other actinide hydride absorptions support assignments of these bands to the simplest molecules HP═ThH2, HP═UH2, and PH2-UH...
February 14, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28195418/upconversion-nanoparticles-synthesized-by-ultra-short-pulsed-laser-ablation-in-liquid-effect-of-stabilizing-environment
#18
Laura Gemini, Tim Schmitz, Rainer Kling, Stephan Barcikowski, Bilal Gökce
The distinctive feature of upconverting compounds to absorb and emit light in the near-infrared region has made upconverting nanoparticles of great interest in various application fields. Nevertheless, these colloids show highly hydrophobic behavior and therefore the use of a proper stabilizing agent is necessary in most cases. Although few chemical techniques for colloid stabilization are available, it is still difficult to achieve a fully reproducible synthesis method for stable upconverting nanoparticle colloids...
February 14, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28195194/in-situ-study-of-nucleation-and-aggregation-phases-for-nanoparticles-grown-by-laser-driven-methods
#19
M Barberio, P Antici
In the last decades, nanomaterials and nanotechnologies have become fundamental and irreplaceable in many fields of science and technology. When used in applications, their properties depend on many factors such as size, shape, internal structure and composition. For this, exact knowledge of their structural features is essential when developing fabrication technologies and searching for new types of nanostructures or nanoparticles with specific properties. For the latter, the knowledge of the precise temporal evolution of the growth processes is fundamental when it comes to industrial production and applications...
February 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28192653/double-network-structured-graphene-oxide-containing-nanogels-as-photothermal-agents-for-the-treatment-of-colorectal-cancer
#20
Calogero Fiorica, Nicolò Mauro, Giovanna Pitarresi, Cinzia Scialabba, Fabio S Palumbo, Gaetano Giammona
Here, we reported the production of hyaluronic acid/polyaspartamide-based double-network nanogels for the potential treatment of colorectal carcinoma. Graphene oxide, thanks to the huge aromatic surface area, allows to easily load high amount of irinotecan (33.0 % w/w) and confers to the system hyperthermic properties when irradiated with a near infrared (NIR) laser beam. We demonstrate that the release of antitumor drug is influenced both by the pH of the external medium and the NIR irradiation process. In vitro biological studies, conducted on human colon cancer cells (HCT 116), revealed that nanogels are uptaken by the cancer cells and, in the presence of the antitumor drug, can produce a synergistic hyperthermic/cytotoxic effect...
February 13, 2017: Biomacromolecules
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