keyword
https://read.qxmd.com/read/38466925/ligand-assisted-direct-lithography-of-upconverting-and-avalanching-nanoparticles-for-nonlinear-photonics
#21
JOURNAL ARTICLE
Jia-Ahn Pan, Artiom Skripka, Changhwan Lee, Xiao Qi, Anne L Pham, Joshua J Woods, Rebecca J Abergel, P James Schuck, Bruce E Cohen, Emory M Chan
Upconverting nanoparticles (UCNPs) exhibit unique nonlinear optical properties that can be harnessed in microscopy, sensing, and photonics. However, forming high-resolution nano- and micropatterns of UCNPs with large packing fractions is still challenging. Additionally, there is limited understanding of how nanoparticle patterning chemistries are affected by the particle size. Here, we explore direct patterning chemistries for 6-18 nm Tm3+ -, Yb3+ /Tm3+ -, and Yb3+ /Er3+ -based UCNPs using ligands that form either new ionic linkages or covalent bonds between UCNPs under ultraviolet (UV), electron-beam (e-beam), and near-infrared (NIR) exposure...
March 11, 2024: Journal of the American Chemical Society
https://read.qxmd.com/read/38465448/stereochemical-heterogeneity-analysis-of-polylactides-by-multidimensional-liquid-chromatography
#22
JOURNAL ARTICLE
Paul S Eselem Bungu, Karola Luetzow, Olaf Lettau, Matthias Schulz, Axel T Neffe, Harald Pasch
A new and robust high-performance liquid chromatography (HPLC) method that separates poly(lactic acid) (PLA) according to its stereochemical composition is presented. Using this method, poly(l-lactide) incorporating trace amounts of meso -lactide resulting from the racemization is separated from the pristine polymer. To prove this aspect in more detail, a representative poly(l-lactic acid) standard, assumed to be highly homogeneous, was separated using this method. The result showed that this was not the case as a fraction incorporating meso -lactide due to racemization occurring during the synthesis is separated...
March 11, 2024: Analytical Chemistry
https://read.qxmd.com/read/38463299/mineral-chemistry-and-chronology-investigation-of-uraninite-in-the-jinguanchong-uranium-deposit-in-eastern-hunan-province-and-the-implications-for-geological-significance
#23
JOURNAL ARTICLE
Pengfei Fan, Mangen Li, Hongye Huang, Guangwen Huang, Yong Gu, Ke Wang, Niannan Chen
Jinguanchong deposit, a part of the Mingyuefeng ore field in eastern Hunan Province, China, is a typical perigranitic uranium deposit (a subtype of granite-related deposit) discovered recently with considerable uranium mineralization. Herein, uraninite, the primary ore mineral in the deposit, was investigated via scanning electron microscopy and electron probe microanalysis. Additionally, laser ablation-inductively coupled plasma-mass spectrometry was used for the first time to determine the in situ U-Pb age and the rare-earth element characteristics of uraninite...
March 5, 2024: ACS Omega
https://read.qxmd.com/read/38462340/streamlining-regular-liquid-chromatography-with-maldi-tof-ms-and-nmr-spectroscopy-using-automatic-full-contact-splitless-spotting-interface-and-flash-tap-fractioning-collection
#24
JOURNAL ARTICLE
Chi-Minh Truong, Yung-Cheng Jair, Hong-Po Chen, Wei-Chih Chen, Yi-Hsin Liu, Pin-Chuan Chen, Pai-Shan Chen
BACKGROUND: High-resolution matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF MS) and nuclear magnetic resonance (NMR) spectroscopy are powerful tools to identify unknown psychoactive substances. However, in complex matrices, trace levels of unknown substances usually require additional fractionation and concentration. Specialized liquid chromatography systems are necessary for both techniques. The small flow rate of nano LC, typically paired with MALDI-TOF MS, often results in prolonged fractionation times...
April 15, 2024: Analytica Chimica Acta
https://read.qxmd.com/read/38457729/subrelativistic-alternating-phase-focusing-dielectric-laser-accelerators
#25
JOURNAL ARTICLE
Payton Broaddus, Thilo Egenolf, Dylan S Black, Melanie Murillo, Clarisse Woodahl, Yu Miao, Uwe Niedermayer, Robert L Byer, Kenneth J Leedle, Olav Solgaard
We demonstrate a silicon-based electron accelerator that uses laser optical near fields to both accelerate and confine electrons over extended distances. Two dielectric laser accelerator (DLA) designs were tested, each consisting of two arrays of silicon pillars pumped symmetrically by pulse front tilted laser beams, designed for average acceleration gradients 35 and 50  MeV/m, respectively. The DLAs are designed to act as alternating phase focusing (APF) lattices, where electrons, depending on the electron-laser interaction phase, will alternate between opposing longitudinal and transverse focusing and defocusing forces...
February 23, 2024: Physical Review Letters
https://read.qxmd.com/read/38457696/positronium-laser-cooling-via-the-1-3-s-2-3-p-transition-with-a-broadband-laser-pulse
#26
JOURNAL ARTICLE
L T Glöggler, N Gusakova, B Rienäcker, A Camper, R Caravita, S Huck, M Volponi, T Wolz, L Penasa, V Krumins, F P Gustafsson, D Comparat, M Auzins, B Bergmann, P Burian, R S Brusa, F Castelli, G Cerchiari, R Ciuryło, G Consolati, M Doser, Ł Graczykowski, M Grosbart, F Guatieri, S Haider, M A Janik, G Kasprowicz, G Khatri, Ł Kłosowski, G Kornakov, L Lappo, A Linek, J Malamant, S Mariazzi, V Petracek, M Piwiński, S Pospíšil, L Povolo, F Prelz, S A Rangwala, T Rauschendorfer, B S Rawat, V Rodin, O M Røhne, H Sandaker, P Smolyanskiy, T Sowiński, D Tefelski, T Vafeiadis, C P Welsch, M Zawada, J Zielinski, N Zurlo
We report on laser cooling of a large fraction of positronium (Ps) in free flight by strongly saturating the 1^{3}S-2^{3}P transition with a broadband, long-pulsed 243 nm alexandrite laser. The ground state Ps cloud is produced in a magnetic and electric field-free environment. We observe two different laser-induced effects. The first effect is an increase in the number of atoms in the ground state after the time Ps has spent in the long-lived 2^{3}P states. The second effect is one-dimensional Doppler cooling of Ps, reducing the cloud's temperature from 380(20) to 170(20) K...
February 23, 2024: Physical Review Letters
https://read.qxmd.com/read/38455658/infertility-in-fabry-s-disease-role-of-hypoxia-and-inflammation-in-determining-testicular-damage
#27
JOURNAL ARTICLE
Luigi Sansone, Federica Barreca, Manuel Belli, Michele Aventaggiato, Andrea Russo, Giulietta A Perrone, Matteo A Russo, Marco Tafani, Andrea Frustaci
INTRODUCTION: Fabry's disease (FD) is a genetic X-linked systemic and progressive rare disease characterized by the accumulation of globotriaosylceramide (GB3) into the lysosomes of many tissues. FD is due to loss-of-function mutations of α-galactosidase, a key-enzyme for lysosomal catabolism of glycosphingolipids, which accumulate as glycolipid bodies (GB). In homozygous males the progressive deposition of GB3 into the cells leads to clinical symptoms in CNS, skin, kidney, etc...
2024: Frontiers in Endocrinology
https://read.qxmd.com/read/38453744/evaluation-of-combining-ultrapulse-co-2-with-fractional-co-2-laser-for-the-treatment-of-atrophic-scars-in-asians
#28
JOURNAL ARTICLE
Min-Xia Zhang, Xian Hu, Yong Wang, Li Chen, Wei-Na Shao, Chun-Ye Chen, Fa-Wei Xu, Zi-Chun Gu, Wei-Qiang Tan
Various treatment modalities have been applied to atrophic scars. Fractional CO2 laser treatment has attracted increasingly more attention because of its quicker recovery time and fewer side effects. However, its limitation of sculpting the edge is an urgent shortcoming. In order to achieve a more effective result with fewer complications, we have integrated ultrapulse CO2 and fractional CO2 lasers to for the treatment of facial atrophic scars. The study included 25 patients (10 males and 15 females) diagnosed with moderate to severe atrophic scars between August 2020 and July 2022...
March 8, 2024: Lasers in Medical Science
https://read.qxmd.com/read/38451216/unraveling-the-nano-bio-interface-interactions-of-a-lipase-adsorbed-on-gold-nanoparticles-under-laser-excitation
#29
JOURNAL ARTICLE
Heloise Ribeiro de Barros, Rafael Trivella Pacheco da Silva, Rafaella Fernandes, Jhoan Toro-Mendoza, Ivan Coluzza, Marcia L A Temperini, Susana I Cordoba de Torresi
The complex nature and structure of biomolecules and nanoparticles and their interactions make it challenging to achieve a deeper understanding of the dynamics at the nano-bio interface of enzymes and plasmonic nanoparticles subjected to light excitation. In this study, circular dichroism (CD) and Raman spectroscopic experiments and molecular dynamics (MD) simulations were used to investigate the potential changes at the nano-bio interface upon plasmonic excitation. Our data showed that photothermal and thermal heating induced distinct changes in the secondary structure of a model nanobioconjugate composed of lipase from Candida antarctica fraction B (CALB) and gold nanoparticles (AuNPs)...
March 7, 2024: Langmuir: the ACS Journal of Surfaces and Colloids
https://read.qxmd.com/read/38450437/a-new-%C3%AE-globin-gene-variant-hb-a2-yulin-%C3%AE-46-cd5-gly%C3%A2-arg-hbd-c-139g%C3%A2-%C3%A2-a
#30
JOURNAL ARTICLE
Hui-Ming Lin, Liang Liang, Yi-Jiao Cai, Li-Hong Zheng, Qing-Peng Qin, You-Qiong Li
We report a new δ-chain hemoglobin (Hb) variant observed in a 5-year-old female living in Yulin, Guangxi, China. Capillary electrophoresis revealed splitting of the Hb A2 peak into two fractions (Hb A2 and Hb A2 variant), and the Hb A2 variant was also detected by high-performance liquid chromatography. However, it could not be detected using matrix-assisted laser desorption lonization-time of flight mass spectrometry. CD41-42 (-TCTT) heterozygosity was observed on the HBB gene by PCR and reverse dot-blot hybridization...
March 7, 2024: Hemoglobin
https://read.qxmd.com/read/38450099/left-atrial-diastasis-strain-slope-is-a-marker-of-hemodynamic-recovery-in-post-st-elevation-myocardial-infarction-the-laser-atherectomy-for-stemi-pci-analysis-with-scintigraphy-study-last-pass
#31
JOURNAL ARTICLE
Yoko Kato, Wei Hao Lee, Makoto Natsumeda, Bharath Ambale-Venkatesh, Kensuke Takagi, Yuji Ikari, Joao A C Lima
BACKGROUND: Left atrial (LA) mechanics are strongly linked with left ventricular (LV) filling. The LA diastasis strain slope (LADSS), which spans between the passive and active LA emptying phases, may be a key indicator of the LA-LV interplay during diastole. AIM: This study aimed to investigate the LA-LV interdependencies in post-ST elevation myocardial infarction (STEMI), with particular focus on the LADSS. MATERIALS AND METHODS: Patients with post-anterior STEMI who received primary percutaneous coronary intervention underwent contrast cardiac magnetic resonance imaging (MRI) during acute (5-9 days post-STEMI) and chronic (at 6 months) phases...
2024: Front Radiol
https://read.qxmd.com/read/38444425/comprehensive-review-of-thermomechanical-fractional-injury-device-applications-in-medical-and-cosmetic-dermatology
#32
REVIEW
Blanca Estupiñan, Adam Souchik, Alexandra Kiszluk, Shraddha Desai
OBJECTIVE: Our aim was to review the current and emerging dermatological applications of the novel thermomechanical fractional injury (TMFI) device, Tixel® (Novoxel, Netanya, Israel). METHODS: A systematic review of PubMed using the search terms of "Tixel", "thermomechanical fractional", ["thermomechanical ablation" and "skin"], and ["thermomechanical ablation" and "dermatology"]. RESULTS: Thirty-six articles matched our inquiry. Fifteen articles did not meet inclusion criteria...
February 2024: Journal of Clinical and Aesthetic Dermatology
https://read.qxmd.com/read/38439412/coherent-photo-thermal-noise-cancellation-in-a-dual-wavelength-optical-cavity-for-narrow-linewidth-laser-frequency-stabilisation
#33
JOURNAL ARTICLE
Fabian Dawel, Alexander Wilzewski, Sofia Herbers, Lennart Pelzer, Johannes Kramer, Marek B Hild, Kai Dietze, Ludwig Krinner, Nicolas C H Spethmann, Piet O Schmidt
Optical resonators are used for the realisation of ultra-stable frequency lasers. The use of high reflectivity multi-band coatings allows the frequency locking of several lasers of different wavelengths to a single cavity. While the noise processes for single wavelength cavities are well known, the correlation caused by multi-stack coatings has as yet not been analysed experimentally. In our work, we stabilise the frequency of a 729 nm and a 1069 nm laser to one mirror pair and determine the residual-amplitude modulation (RAM) and photo-thermal noise (PTN)...
February 26, 2024: Optics Express
https://read.qxmd.com/read/38439396/using-double-pulse-laser-ablation-in-air-to-enhance-the-strength-of-laser-driven-shocks
#34
JOURNAL ARTICLE
Jonathan C Crowhurst, Sonny Ly, Batikan Koroglu, Wesley J Keller
In the process of multi-pulse laser ablation, inter-pulse delay time, Δt, is known to be an important parameter for maximizing ablation efficiency as well as impulse imparted to the target. In this work, using photon Doppler velocimetry, we show that for single pairs of colinear pulses (1064 nm, 8 ns, ∼ 60 J cm-2 per pulse) in air, the peak free surface velocity of the back surface of an aluminum target (125 µm thick) is increased, by a factor of nearly 3, when Δt = 10 microseconds, compared with both pulses arriving simultaneously (Δt = 0)...
February 26, 2024: Optics Express
https://read.qxmd.com/read/38439329/laser-frequency-stabilization-by-modulation-transfer-spectroscopy-and-balanced-detection-of-molecular-iodine-for-laser-cooling-of-174-yb
#35
JOURNAL ARTICLE
Álvaro M G de Melo, Hector Letellier, Apoorva Apoorva, Antoine Glicenstein, Robin Kaiser
We report laser frequency stabilization by the combination of modulation transfer spectroscopy and balanced detection of a relatively weak hyperfine transition of the R(158)25-0 line of molecular iodine (127 I2 ), which is used as a new frequency reference for laser trapping and cooling of 174 Yb on the 1 S0  - 3 P1 transition. The atomic cloud is characterized by time-of-flight measurements, and an on-resonance optical depth of up to 47 is obtained. We show laser noise reduction and characterize the short-term laser frequency instability by the Allan deviation of the laser fractional frequency...
February 12, 2024: Optics Express
https://read.qxmd.com/read/38436122/proactive-esophageal-cooling-during-laser-cardiac-ablation-a-computer-modeling-study
#36
JOURNAL ARTICLE
Tatiana Gomez Bustamante, Marcela Mercado Montoya, Enrique Berjano, Ana González-Suárez, Erik Kulstad
BACKGROUND AND OBJECTIVES: Laser ablation is increasingly used to treat atrial fibrillation (AF). However, atrioesophageal injury remains a potentially serious complication. While proactive esophageal cooling (PEC) reduces esophageal injury during radiofrequency ablation, the effects of PEC during laser ablation have not previously been determined. We aimed to evaluate the protective effects of PEC during laser ablation of AF by means of a theoretical study based on computer modeling...
March 4, 2024: Lasers in Surgery and Medicine
https://read.qxmd.com/read/38436118/efficacy-and-safety-of-1064-nm-fractional-picosecond-laser-for-the-treatment-of-postmastectomy-scars-in-transgender-men-a-randomized-controlled-trial
#37
JOURNAL ARTICLE
Suthinee Rutnin, Tanat Yongpisarn, Nawara Sakpuwadol, Amornrut Namasondhi, Cherrin Pomsoong, Teerapong Rattananukrom, Kunlawat Thadanipon
OBJECTIVES: Subcutaneous mastectomy is a crucial component of gender affirmation therapy for transgender men (TM), but the scars that result from this procedure can frequently impair their quality of life. This study aimed to assess the efficacy and safety of 1064-nm fractional picosecond laser (FxPico) treatment for hypertrophic and atrophic postmastectomy scars in TM. METHODS: Twenty-two patients with a total of 35 pairs of bilateral symmetric mastectomy scars were enrolled...
March 4, 2024: Lasers in Surgery and Medicine
https://read.qxmd.com/read/38429092/rapid-microdissection-of-tissue-sections-via-laser-ablation
#38
JOURNAL ARTICLE
Robin Jn Coope, Stephen Pleasance, Pawan Pandoh, Colin Schlosser, Richard D Corbett, Marco A Marra
We demonstrate a method for tissue microdissection using scanning laser ablation that is approximately two orders of magnitude faster than conventional laser capture microdissection. Our novel approach uses scanning laser optics and a slide coating under the tissue that can be excited by the laser to selectively eject regions of tissue for further processing. Tissue was dissected at 0.117 s/mm2 without reduction in yield, sequencing insert size or base quality compared with undissected tissue. From eight cases, 58-416 mm2 of tissue was obtained from one to four slides in 7-48 seconds total dissection time per case...
March 1, 2024: Journal of Clinical Pathology
https://read.qxmd.com/read/38426997/long-lived-nitric-oxide-molecular-tagging-velocimetry-with-1%C3%A2-%C3%A2-1-rempi
#39
JOURNAL ARTICLE
Naibo Jiang, Paul S Hsu, Sukesh Roy, Jincheng Wang, Hui Hu, Neil Rodrigues, Paul M Danehy
The successful demonstration of long-lived nitric oxide (NO) fluorescence for molecular tagging velocimetry (MTV) measurements is described in this Letter. Using 1 + 1 resonance-enhanced multiphoton ionization (REMPI) of NO at a wavelength near 226 nm, targeting the overlapping Q1 (7) and Q21 (7) lines of the A-X (0, 0) electronic system, the lifetime of the NO MTV signal was observed to be approximately 8.6 µs within a 100-Torr cell containing 2% NO in nitrogen. This is in stark contrast to the commonly reported single photon NO fluorescence, which has a much shorter calculated lifetime of approximately 43 ns at this pressure and NO volume fraction...
March 1, 2024: Optics Letters
https://read.qxmd.com/read/38426374/treatment-of-erythematous-acne-scars-using-595-nm-pulsed-dye-laser-combined-with-1565-nm-resurfx-nonablative-fractional-laser
#40
JOURNAL ARTICLE
Chenxi Zhou, Meijuan Yao, Weiliang Chen, Liyuan Zhang, Lidan Zhang, Jiaojiao Chen, Kai Li, Xiailei Qin
BACKGROUND: Acne vulgaris is a common inflammatory disease associated with various sequelae after skin lesion remission. Acne erythema has been considered simple erythema or a vascular lesion; however, because the understanding of this disease has improved, acne erythema is currently considered an early scar with erythematous components. AIMS: This study evaluated the efficacy of using both a 595-nm pulsed dye laser (PDL) and 1565-nm nonablative fractional laser (NAFL) for the treatment of erythematous scars caused by acne...
March 1, 2024: Journal of Cosmetic Dermatology
keyword
keyword
37330
2
3
Fetch more papers »
Fetching more papers... Fetching...
Remove bar
Read by QxMD icon Read
×

Save your favorite articles in one place with a free QxMD account.

×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"

We want to hear from doctors like you!

Take a second to answer a survey question.