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https://www.readbyqxmd.com/read/28328040/purification-of-baso4-precipitate-contaminated-with-organic-matter-for-oxygen-isotope-measurements-%C3%AE-18-o-and-%C3%AE-17-o
#1
Luhua Xie, Baruch Spiro, Gangjian Wei
RATIONALE: Sulfate precipitates are often contaminated with nitrates and organic materials (OM), which reduce the precision and accuracy of measurements of δ(18) O and Δ(17) O values in the sulfate. Although nitrates can be effectively removed using diethylenetriaminepentaacetic acid solution, removing OM from the precipitates is often difficult. One effective approach is to heat powdered precipitates to high temperatures. In this study, the effect of this procedure on the δ(18) O and Δ(17) O values of BaSO4 precipitate was fully examined...
July 30, 2016: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28323482/constraints-on-the-early-terrestrial-surface-uv-environment-relevant-to-prebiotic-chemistry
#2
Sukrit Ranjan, Dimitar D Sasselov
The UV environment is a key boundary condition to abiogenesis. However, considerable uncertainty exists as to planetary conditions and hence surface UV at abiogenesis. Here, we present two-stream multilayer clear-sky calculations of the UV surface radiance on Earth at 3.9 Ga to constrain the UV surface fluence as a function of albedo, solar zenith angle (SZA), and atmospheric composition. Variation in albedo and latitude (through SZA) can affect maximum photoreaction rates by a factor of >10.4; for the same atmosphere, photoreactions can proceed an order of magnitude faster at the equator of a snowball Earth than at the poles of a warmer world...
March 2017: Astrobiology
https://www.readbyqxmd.com/read/28317240/treatment-of-nevus-lipomatosus-cutaneous-superficialis-with-co2-laser
#3
Kabir Sardana, Shivani Bansal, Vijay K Garg, Nita Khurana
Nevus lipomatosus cutaneous superficialis (NLCS) is an uncommon lesion characterized by ectopic adipose tissue in the dermis and can be generalized or localized. It presents as a soft skin colored to yellowish papules or cerebriform plaques occurring usually on the buttock or thigh in a segment distribution. We report a case of NLCS in 38-year-old female, which was treated using the ultrapulse mode CO2 Laser. We describe the scientific logic and clinical results of using the ultrapulse mode in relation to the pathology of NLCS...
March 19, 2017: Journal of Cosmetic Dermatology
https://www.readbyqxmd.com/read/28299681/screen-printed-all-polymer-aptasensor-for-impedance-based-detection-of-influenza-a-virus
#4
Julie Kirkegaard, Noemi Rozlosnik
In this chapter a detailed description of the fabrication and testing of an aptasensor for influenza A virus detection is given. The sensor chip is an all-polymer chip fabricated with screen-printed poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) electrodes. Chip substrates are made by CO2 laser cutting of Poly(methyl methacrylate) (PMMA) sheets. Influenza A virus specific aptamers are immobilized onto the electrodes by UV cross-linking. Impedance based measurements at a single frequency, measured over time, are used to detect the virus in a buffer solution...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28296519/congenital-melanocytic-nevus-on-the-lower-eyelid-treated-with-continuous-wave-and-superpulsed-co2-laser-followed-by-erbium-laser
#5
Vito Abrusci, Valentina Benzecry
There are several therapeutic options to treat congenital melanocytic nevi. The motivations for the treatment of small- to medium-sized congenital nevi located on the face or other sensitive areas are frequently cosmetic. The choice of therapy depends on the operator's expertise and on the likelihood of improved cosmesis. We report a case of a medium-sized congenital nevi located on the lower eyelid, successfully treated with a combination of ablative lasers with a single surgical procedure. We achieved an excellent clinical and cosmetic result...
February 17, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/28296244/-watchful-observation-follow-up-scheme-after-endoscopic-co2-laser-treatment-for-small-glottic-carcinomas-a-retrospective-study-of-93-cases
#6
Patrice Gallet, Cécile Rumeau, Duc Trung Nguyen, Pedro Augusto Teixeira, Cédric Baumann, Bruno Toussaint
OBJECTIVES: Evaluate the clinical outcome of patients treated with CO2-laser surgery for early-stage glottic carcinomas followed-up with 3 month laryngoscopy regardless of tumor grade and margins. DESIGN: Case series. SETTING: Retrospective review of the clinical records of patients treated at the ENT department of a tertiary university hospital. PARTICIPANTS AND METHOD: Clinical records from patients with early-stage glottic carcinomas (Tis-T2) treated with curative intent by CO2-laser surgery in a ten year period were evaluated...
March 10, 2017: Clinical Otolaryngology
https://www.readbyqxmd.com/read/28296060/monolithic-and-flexible-zns-sno2-ultraviolet-photodetectors-with-lateral-graphene-electrodes
#7
Cheng Zhang, Yunchao Xie, Heng Deng, Travis Tumlin, Chi Zhang, Jheng-Wun Su, Ping Yu, Jian Lin
A continuing trend of miniaturized and flexible electronics/optoelectronic calls for novel device architectures made by compatible fabrication techniques. However, traditional layer-to-layer structures cannot satisfy such a need. Herein, a novel monolithic optoelectronic device fabricated by a mask-free laser direct writing method is demonstrated in which in situ laser induced graphene-like materials are employed as lateral electrodes for flexible ZnS/SnO2 ultraviolet photodetectors. Specifically, a ZnS/SnO2 thin film comprised of heterogeneous ZnS/SnO2 nanoparticles is first coated on polyimide (PI) sheets by a solution process...
March 15, 2017: Small
https://www.readbyqxmd.com/read/28294701/the-impact-of-a-940%C3%A2-nm-diode-laser-with-radial-firing-tip-and-bare-end-fiber-tip-on-enterococcus-faecalis-in-the-root-canal-wall-dentin-of-bovine-teeth-an-in-vitro-study
#8
Ruth Schulte-Lünzum, Norbert Gutknecht, Georg Conrads, Rene Franzen
OBJECTIVE: This in vitro study aimed to compare the bactericidal effect of two different laser delivery systems, a radial firing tip (RFT) and bare end fiber tip (BFT) used with the 940 nm diode laser on Enterococcus faecalis inoculated onto bovine radicular dentin. MATERIALS AND METHODS: A total of 100 bovine dentin slices with a defined thickness of 500 and 1000 μm were prepared. They were assigned into four test groups together with untreated samples served as control for each slice thickness...
March 14, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28293107/nh4hco3-gas-generating-liposomal-nanoparticle-for-photoacoustic-imaging-in-breast-cancer
#9
Jizhu Xia, Gang Feng, Xiaorong Xia, Lan Hao, Zhigang Wang
In this study, we have developed a biodegradable nanomaterial for photoacoustic imaging (PAI). Its biodegradation products can be fully eliminated from a living organism. It is a gas-generating nanoparticle of liposome-encapsulating ammonium bicarbonate (NH4HCO3) solution, which is safe, effective, inexpensive, and free of side effects. When lasers irradiate these nanoparticles, NH4HCO3 decomposes to produce CO2, which can absorb much of the light energy under laser irradiation with a specific wavelength, and then expand under heat to generate a thermal acoustic wave...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28291062/pulsed-co2-laser-ablation-of-superficial-basal-cell-of-limbs-and-trunk-a-comparative-randomized-clinical-trial-with-cryotherapy-and-surgical-ablation
#10
Cristina Zane, Elena Facchinetti, Mariachiara Arisi, Bernhard Ortel, Piergiacomo Calzavara-Pinton
BACKGROUND: Pulsed CO2 laser is a treatment of superficial basal cell carcinoma (sBCC) although robust clinical evidence has not been reported so far. OBJECTIVE: The authors investigated efficacy, safety, time to wound healing, cosmetic outcome, patient satisfaction, and cost-effectiveness ratio of pulsed CO2 laser in comparison to cryotherapy and surgery. MATERIALS AND METHODS: BCCs of the trunk and extremities were randomized to one of the treatments...
March 13, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28285053/co2-responsive-polyacrylamide-microspheres-with-interpenetrating-networks
#11
Meng Mu, Hongyao Yin, Yujun Feng
HYPOTHESIS: CO2-responsive microspheres fabricated via co-polymerization protocol are attractive due to their promising applications. However, the inevitable particles-agglomeration restrained their further utilizations. Towards this challenge, interpenetrating network (IPN) protocol would be a potential choice to construct the "intelligent" microspheres, which presents superiority in comparison with co-polymerization mode. EXPERIMENTS: A series of CO2-responsive microspheres with polyacrylamide (PAM)/poly(dimethyl aminopropyl methacrylamide) (PDMAPMA) IPN-structure were fabricated via inverse seed suspension polymerization by adjusting DMAPMA loading and crosslinking-degree of seeds...
March 2, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28281265/enhanced-performance-of-colorimetric-biosensing-on-paper-microfluidic-platforms-through-chemical-modification-and-incorporation-of-nanoparticles
#12
Ellen Flávia Moreira Gabriel, Paulo T Garcia, Elizabeth Evans, Thiago M G Cardoso, Carlos D Garcia, Wendell K T Coltro
This chapter describes two different methodologies used to improve the analytical performance of colorimetric paper-based biosensors. Microfluidic paper-based analytical devices (μPADs) have been produced by a stamping process and CO2 laser ablation and modified, respectively, through an oxidation step and incorporation of silica nanoparticles on the paper structure. Both methods are employed in order to overcome the largest problem associated with colorimetric detection, the heterogeneity of the color distribution in the detection zones...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28280997/shear-bond-wettability-and-afm-evaluations-on-co2-laser-irradiated-cad-cam-ceramic-surfaces
#13
Ahmed El Gamal, Etienne Medioni, Jean Paul Rocca, Carlo Fornaini, Omid H Muhammad, Nathalie Brulat-Bouchard
The purpose of this study is to determine the CO2 laser irradiation in comparison with sandblasting (Sb), hydrofluoric acid (Hf) and silane coupling agent (Si) on shear bond strength (SBS), roughness (Rg) and wettability (Wt) of resin cement to CAD/CAM ceramics. Sixty (CAD/CAM) ceramic discs were prepared and distributed into six different groups: group A, control lithium disilicate (Li); group B, control zirconia (Zr); group C, Li: CO2/HF/Si; group D, Li: HF/Si; group E, Zr: CO2/Sb/Si; group F, Zr: Sb/Si. Result showed significant difference between irradiated and non-irradiated in terms of shear bond strength for zirconia ceramics (p value = 0...
March 9, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28280755/clinical-evaluation-of-high-and-low-level-laser-treatment-co2vsingaalp-diode-laser-for-recurrent-aphthous-stomatitis
#14
Nasim Zeini Jahromi, Janan Ghapanchi, Sara Pourshahidi, Maryam Zahed, Hooman Ebrahimi
STATEMENT OF THE PROBLEM: Recurrent aphthous stomatitis (RAS) is one of the most common lesions in the oral cavity. Due to its multifactorial nature, there is no definitive treatment for RAS. Laser therapy is one of the suggested treatments to reduce patient's discomfort. PURPOSE: The purpose of the present clinical trial is to assess the effect of low and high level laser therapy on pain control and wound healing of RAS. MATERIALS AND METHOD: Thirty six patients with minor RAS were divided into three groups...
March 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28277485/flexible-co2-laser-treatment-for-subglottic-stenosis
#15
Rasit Cevizci, Alper Dilci, Ilknur Haberal Can, Burak Kersin, Yildirim Bayazit
OBJECTIVES: To assess the efficacy and safety of flexible fiber CO2 laser surgery for subglottic stenosis and to present retrospective experience of 14 patients treated with flexible fiber CO2 laser system. To determine the characteristics, management protocols, prognostic factors, and postoperative outcomes of the sample. METHODS: Retrospective review of patients with subglottic stenosis undergoing flexible fiber CO2 laser surgery at the tertiary medical center...
March 8, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28277004/fractional-laser-assisted-percutaneous-drug-delivery-via-temperature-responsive-liposomes
#16
Takahiro Fujimoto, Masayuki Ito, Shinobu Ito, Hideko Kanazawa
Liposomes are used for transdermal delivery of drugs and vaccines. Our objective was to develop temperature-responsive (TR) liposomes to achieve temperature-dependent, controlled release of an encapsulated drug, and use fractional laser irradiation to enhance transdermal permeability of these liposomes. TR-liposomes prepared using a thermosensitive polymer derived from poly-N-isopropylacrylamide, N,N-dimethylacrylamide, egg phosphatidylcholine, and dioleoylphosphatidylethanolamine, delivered fluorescein isothiocyanate-conjugated ovalbumin (OVA-FITC) as a model drug...
May 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28275907/changes-in-swallowing-related-quality-of-life-after-endoscopic-treatment-for-zenker-s-diverticulum-using-swal-qol-questionnaire
#17
REVIEW
C Colpaert, O M Vanderveken, K Wouters, P Van de Heyning, C Van Laer
Dysphagia affects the most cardinal of human functions: the ability to eat and drink. The aim of this prospective study was to evaluate swallowing dysfunction in patients diagnosed with Zenker's diverticulum using the Swallowing Quality of Life (SWAL-QOL) questionnaire preoperatively. In addition, SWAL-QOL was used to assess changes in the outcome of swallowing function after endoscopic treatment of Zenker's diverticulum compared to baseline. Pre- and postoperative SWAL-QOL data were analyzed in 25 patients who underwent endoscopic treatment of Zenker's diverticulum between January 2011 and December 2013...
March 9, 2017: Dysphagia
https://www.readbyqxmd.com/read/28260184/co2-laser-for-the-treatment-of-diabetic-foot-ulcers-with-exposed-bone-a-consecutive-series-of-type-2-diabetic-patients
#18
M Monami, C Mirabella, A Scatena, B Nreu, S Zannoni, S Aleffi, L Giannoni, E Mannucci
AIM: The treatment of foot ulcers with exposed bone is challenging, because of the risk of infection and of difficulties in the development of granulation tissue. A CO2 laser beam could be used to produce discontinuities in periosteum, allowing the exposure of blood containing multipotent stem cells, capable of initiating the healing process. The local application of platelet-rich plasma (PRP) has been proposed as a therapeutic tool for accelerating healing in foot ulcers, including those in patients with diabetes...
March 4, 2017: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/28252592/-the-application-of-the-modern-high-energy-laser-technologies-for-the-surgical-treatment-of-the-patients-presenting-with-otosclerosis
#19
V V Vishnyakov, V M Svistushkin, E V Sin'kov
The objective of the present study was to determine the optimal parameters of radiation of the CO2 laser during the surgical intervention for the treatment of the patients presenting with otosclerosis. The experimental part of the study was carried out with the use of the isolated temporal bones. Under the clinical conditions, the patients with the tympanic and mixed forms of otosclerosis underwent stapedoplasty with the use of the CO2 laser. It was shown that the use of the CO2 laser at different stages of stapedoplasty considerably reduces the risk of development of the post-operative complications...
2017: Vestnik Otorinolaringologii
https://www.readbyqxmd.com/read/28240413/formation-of-gas-phase-formate-in-thermal-reactions-of-carbon-dioxide-with-diatomic-iron-hydride-anions
#20
Li-Xue Jiang, Chongyang Zhao, Xiao-Na Li, Hui Chen, Sheng-Gui He
The hydrogenation of carbon dioxide involves the activation of the thermodynamically very stable molecule CO2 and formation of a C-H bond. Herein, we report that HCO2(-) and CO can be formed in the thermal reaction of CO2 with a diatomic metal hydride species, FeH(-) . The FeH(-) anions were produced by laser ablation, and the reaction with CO2 was analyzed by mass spectrometry and quantum-chemical calculations. Gas-phase HCO2(-) was observed directly as a product, and its formation was predicted to proceed by facile hydride transfer...
February 27, 2017: Angewandte Chemie
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