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Cold laser

Jonathan P Robson, Pavlo Kokhanenko, Jean K Marshall, Anthony R Phillips, Jan van der Linden
Tissue perfusion during surgery is important in reducing surgical site infections and promoting healing. This study aimed to determine if insufflation of the open abdomen with heated, humidified (HH) carbon dioxide (CO2) increased visceral tissue perfusion and core body temperature during open abdominal surgery in a rodent model. Using two different rodent models of open abdominal surgery, visceral perfusion and core temperature were measured. Visceral perfusion was investigated using a repeated measures crossover experiment with rodents receiving the same sequence of two alternating treatments: exposure to ambient air (no insufflation) and insufflation with HH CO2...
2018: PloS One
Peri Korshed, Lin Li, Duc-The Ngo, Tao Wang
Silver nanoparticles (AgNPs) are widely used as antibacterial agents, but their antibacterial durability and the influence by storage conditions have not been thoroughly investigated. In this study, AgNPs were produced using a picosecond laser and stored under three different conditions: daylight, dark and cold (4 °C). The antibacterial effects of the laser AgNPs were examined against Escherichia coli in either a 14-day interval (frequent air exposure) or a 45-day interval (less frequent air exposure) using a well-diffusion method until the antibacterial effects disappeared...
April 4, 2018: Nanomaterials
Michael W Linscheid
To understand biological processes, not only reliable identification, but quantification of constituents in biological processes play a pivotal role. This is especially true for the proteome: protein quantification must follow protein identification, since sometimes minute changes in abundance tell the real tale. To obtain quantitative data, many sophisticated strategies using electrospray and MALDI mass spectrometry (MS) have been developed in recent years. All of them have advantages and limitations. Several years ago, we started to work on strategies, which are principally capable to overcome some of these limits...
March 30, 2018: Mass Spectrometry Reviews
Anshul Mainkar, Sahng G Kim
INTRODUCTION: The aim of this systematic review was to investigate and compare the diagnostic accuracy including sensitivity, specificity, adjusted accuracy, adjusted positive predictive value (PPV), and adjusted negative predictive value (NPV) of cold pulp testing (CPT), heat pulp testing (HPT), electric pulp testing (EPT), laser Doppler flowmetry (LDF), and pulse oximetry (PO). METHODS: Three electronic databases were searched from January 1964 to December 2016...
March 20, 2018: Journal of Endodontics
Bernadett Mosdósi, Kata Bölcskei, Zsuzsanna Helyes
BACKGROUND: Raynaud's phenomenon (RP) is a functional vascular disease, presenting with recurrent episodes of ischemia of extremities in response to cold and emotional stress. Investigating cutaneous microcirculation is an important tool in understanding the complex neuro-immuno-vascular interactions in its pathophysiological mechanisms. Since there is no available data on vascular responsiveness in RP in the paediatric population, we investigated skin perfusion and heat-induced hyperaemia in comparison with clinical severity and laboratory parameters of the disease...
March 23, 2018: Pediatric Rheumatology Online Journal
Toscane C Noordhoff, Jan Groen, Jeroen R Scheepe, Bertil F M Blok
CONTEXT: Surgical treatment of anatomic bladder outlet obstruction (BOO) may be indicated in males with neurogenic bladder dysfunction. A bothersome complication after surgery is urinary incontinence. OBJECTIVE: To identify the optimal practice in the surgical treatment of anatomic BOO in males with neurogenic bladder dysfunction, due to multiple sclerosis, Parkinson disease, spinal cord injury (SCI), spina bifida, or cerebrovascular accident (CVA). EVIDENCE ACQUISITION: A systematic review was conducted according to the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) statement...
March 15, 2018: European Urology Focus
Hans G Rinderknecht, H-S Park, J S Ross, P A Amendt, D P Higginson, S C Wilks, D Haberberger, J Katz, D H Froula, N M Hoffman, G Kagan, B D Keenan, E L Vold
The structure of a strong collisional shock front forming in a plasma is directly probed for the first time in laser-driven gas-jet experiments. Thomson scattering of a 526.5 nm probe beam was used to diagnose temperature and ion velocity distribution in a strong shock (M∼11) propagating through a low-density (ρ∼0.01  mg/cc) plasma composed of hydrogen. A forward-streaming population of ions traveling in excess of the shock velocity was observed to heat and slow down on an unmoving, unshocked population of cold protons, until ultimately the populations merge and begin to thermalize...
March 2, 2018: Physical Review Letters
Y Wang, S Subhankar, P Bienias, M Łącki, T-C Tsui, M A Baranov, A V Gorshkov, P Zoller, J V Porto, S L Rolston
We report on the experimental realization of a conservative optical lattice for cold atoms with a subwavelength spatial structure. The potential is based on the nonlinear optical response of three-level atoms in laser-dressed dark states, which is not constrained by the diffraction limit of the light generating the potential. The lattice consists of a one-dimensional array of ultranarrow barriers with widths less than 10 nm, well below the wavelength of the lattice light, physically realizing a Kronig-Penney potential...
February 23, 2018: Physical Review Letters
Melissa P Woodard, Scott T Akin, Collin J Dibble, Michael A Duncan
Ultra-small chromium oxide nanoclusters produced by laser vaporization in a fast flowtube reactor are ligand-coated by gas phase reactions with acetonitrile vapor and then captured in a cold trap and transferred to solution. The resulting clusters are characterized with mass spectrometry, UV-visible absorption and emission, infrared spectroscopy, and surface-enhanced Raman spectroscopy (SERS). According to mass spectrometry, clusters of the form CrxOy(MeCN)z are produced in the size range of x  10 and y < 25...
March 15, 2018: Journal of Physical Chemistry. A
Chanchan Liu, Narayanan Srividya, Amber N Parrish, Wei Yue, Mingqiu Shan, Qinan Wu, B Markus Lange
Schizonepeta tenuifolia Briquet, commonly known as Japanese catnip, is used for the treatment of colds, headaches, fevers, and skin rashes in traditional Asian medicine (China, Japan and Korea). The volatile oil and its constituents have various demonstrated biological activities, but there is currently limited information regarding the site of biosynthesis. Light microscopy and scanning electron microscopy indicated the presence of three distinct glandular trichome types which, based on their morphological features, are referred to as peltate, capitate and digitiform glandular trichomes...
March 10, 2018: Phytochemistry
Gary J Hodges, Matthew M Mallette, Stephen S Cheung
Whether sympathetic withdrawal or endothelial dilators such as nitric oxide (NO) contributes to cold-induced vasodilation (CIVD) events is unclear. We measured blood flow and finger skin temperature (Tfinger ) of the index finger in nine participants during hand immersion in a water bath at 35 °C for 30 min, then at 8 °C for 30 min. Data were binned into 10 s averages for the entire 60 min protocol for laser-Doppler flux (LDF) and Tfinger . At baseline, Tfinger was 35.3 ± 0.2 °C and LDF was 227 ± 28 PU...
March 2, 2018: European Journal of Applied Physiology
Robert Boge, Jakub Horáček, Petr Mazůrek, Jack A Naylon, Jonathan T Green, Zbyněk Hubka, Václav Šobr, Jakub Novák, František Batysta, Roman Antipenkov, Pavel Bakule, Bedřich Rus
A robust and simple method is presented for ensuring constant energy and pointing of a high average power solid state laser on a target. In addition to providing long-term stability, this scheme also eliminates any drifts in energy or pointing resulting from the initial warm-up after a cold start. This is achieved using two separate feedback loops: one loop stabilizes the pointing of the beam external to the amplifier cavity and the other locks the cavity mode to have optimum overlap with the pump spot on the active medium...
February 2018: Review of Scientific Instruments
Ningfang Song, Di Hu, Xiaobin Xu, Wei Li, Xiangxiang Lu, Yitong Song
The primary purpose of this study is to investigate the influence of the vertical guiding laser beam waist on cold atom guiding efficiency. In this study, a double magneto-optical trap (MOT) apparatus is used. With an unbalanced force in the horizontal direction, a cold atomic beam is generated by the first MOT. The cold atoms enter the second chamber and are then re-trapped and cooled by the second MOT. By releasing a second atom cloud, the process of transferring the cold atoms from MOT to the dipole trap, which is formed by a red-detuned converged 1064-nm laser, is experimentally demonstrated...
February 28, 2018: Sensors
Venkataram Mysore, Omprakash H Mahadevappa, Shyamanta Barua, Imran Majid, Vishalakshi Viswanath, Ramesh M Bhat, Suresh Talwar, Salim Thurakkal, Sanjeev J Aurangabadkar, Manas Chatterjee, Anil Ganjoo
Background: Currently, the standard protocol regarding the performance of procedures on patients receiving or having recently received isotretinoin (13- cis -retinoic acid) states that the procedures should not be performed. The recommendations in standard books and drug insert require discontinuation of isotretinoin for 6 months before performing cosmetic procedures, including waxing, dermabrasion, chemical peels, laser procedures, or incisional and excisional cold-steel surgery. These recommendations have been followed for over two decades despite little evidence for the stated increased risk of scarring...
October 2017: Journal of Cutaneous and Aesthetic Surgery
Siddharth Tevatia, Vivek Khatri, Nikhil Sharma, Vidya Dodwad
Context: Dentinal hypersensitivity (DH) is a chronic disorder in which patients report sharp and acute pain to a variety of stimuli. Till date, a standardized procedure to treat DH is missing, though several alternative treatment strategies have been designed, including laser therapies. Aim: The aim of the study was to treat DH with minimum chemical concentration and least laser energy level with longer follow-up period. Materials and Methods: One hundred and twenty patients were randomly divided into four groups: (i) Group 1-5% potassium nitrate (KNO3 ); (ii) Group 2 - gallium-aluminum-arsenide diode laser (62...
September 2017: Journal of Indian Society of Periodontology
Adam Leszczyński, Mateusz Mazelanik, Michał Lipka, Michał Parniak, Michał Dąbrowski, Wojciech Wasilewski
Effective and unrestricted engineering of atom-photon interactions requires precise spatially resolved control of light beams. The significant potential of such manipulations lies in a set of disciplines ranging from solid-state to atomic physics. Here we use a Zeeman-like ac-Stark shift caused by a shaped laser beam to perform rotations of spins with spatial resolution in a large ensemble of cold rubidium atoms. We show that inhomogeneities of light intensity are the main source of dephasing and, thus, decoherence; yet, with proper beam shaping, this deleterious effect is strongly mitigated allowing rotations of 15 rad within one spin-precession lifetime...
March 1, 2018: Optics Letters
Norbert Serfozo, Jakub Ondráček, Thodoros Glytsos, Mihalis Lazaridis
The aim of this study was to evaluate the nanoparticle emissions from a laser printer in a chamber in conjunction with emissions from printers in a print room (PR) and to characterize the processes that lead to increased nanoparticle concentrations, as well as to estimate the human particle dose of the printers' users. Measurements were conducted in a small stainless steel environmental chamber under controlled conditions, where the evolution of particle size distributions (PSDs) with time and printed pages was studied in detail...
February 27, 2018: Environmental Science and Pollution Research International
Paul Fourmont, Luis-Felipe Gerlein, Francois-Xavier Fortier, Sylvain G Cloutier, Riad Nechache
Thermoelectric Bi2Te3 and Sb2Te3 thin films with high power factor were successfully obtained by pulsed laser deposition (PLD). Here we demonstrate a well-controlled deposition of Bi2Te3/Sb2Te3 structures on glass substrates, through a shadow mask with micrometer scale features. We stablish an optimal growth temperature of 45 °C to attain compounds with suitable stoichiometric composition, structural and electrical properties, to achieve high thermoelectric power factor. These films are produced without additional post-annealing treatment or added gasses...
February 20, 2018: ACS Applied Materials & Interfaces
A V Strobel, H Tankisi, N B Finnerup, A Fuglsang-Frederiksen, P Jennum, K B Svendsen, F I Kirov, M Otto
BACKGROUND: Idiopathic REM sleep behaviour disorder (iRBD) has been recognised as a significant biomarker for developing a neurodegenerative alpha-synucleinopathy, which is why iRBD is considered to be a prodromal state for alpha-synucleinopathies including Parkinson's disease (PD). Many patients with PD suffer from complaints of pain and present impaired somatosensory function. We hypothesized that pain perception and somatosensory function could be altered already in a preclinical stage of PD including iRBD...
February 2018: Sleep Medicine
Jack D Wilkinson, Sarah A Leggett, Elizabeth J Marjanovic, Tonia L Moore, John Allen, Marina E Anderson, Jason Britton, Maya H Buch, Francesco Del Galdo, Christopher P Denton, Graham Dinsdale, Bridgett Griffiths, Frances Hall, Kevin Howell, Audrey MacDonald, Neil J McHugh, Joanne B Manning, John D Pauling, Christopher Roberts, Jacqueline A Shipley, Ariane L Herrick, Andrea K Murray
BACKGROUND: Objective and reliable outcome measures to facilitate clinical trials of novel treatments for systemic sclerosis (SSc)-related Raynaud's phenomenon (RP) are badly needed. Laser speckle contrast imaging (LSCI) and thermography are non-invasive measures of perfusion that show excellent potential. The purpose of this multi-centre study was to determine the reliability and validity of a hand cold challenge protocol using LSCI, standard thermography and low-cost mobile phone-based thermography...
February 18, 2018: Arthritis & Rheumatology
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