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Anastasiia V Krivoruchko, Anastasia Yu Iziumova, Maria S Kuyukina, Oleg A Plekhov, Oleg B Naimark, Irina B Ivshina
Adhesion of industrially important bacteria to solid carriers through the example of actinobacterium Rhodococcus ruber IEGM 342 adhered to polystyrene was studied using real-time methods, such as infrared (IR) thermography and thermometry with platinum resistance (PR) detectors. Dynamics of heat rate and heat production was determined at early (within first 80 min) stages of rhodococcal cell adhesion. Heat rate was maximal (1.8 × 10-3 -2.7 × 10-3  W) at the moment of cell loading. Heat production was detected for the entire length of adhesion, and its dynamics depended on concentration of rhodococcal cells...
August 17, 2018: Applied Microbiology and Biotechnology
Elin Malmqvist, Mikkel Brydegaard, Marcus Aldén, Joakim Bood
A portable Lidar system developed for large-scale (~1-20 m) combustion diagnostics is described and demonstrated. The system is able to perform remote backscattering measurements with range and temporal resolution. The range resolution is obtained by sharply imaging a part of the laser beam onto a CMOS-array or ICCD detector. The large focal depth required to do this is attained by placing the laser beam, the collection optics and the detector in a so-called Scheimpflug configuration. Results from simulations of the range capabilities and range resolution of the system are presented and its temporal resolution is also discussed...
June 11, 2018: Optics Express
Lu Zhao, Jiashan Mao, Bin Jiang, Xiantao Wei, Yonghu Chen, Min Yin
A new strategy of optical thermometry is realized by long persistent luminescence phosphor SrAl2 O4 :Eu2+ , Dy3+ , Tb3+ (SAEDT). Under different temperatures, SAEDT shows bright afterglow emissions after cessation of the UV excitation. The afterglow color of the SAEDT sample is blue at 60 K and gradually changed into green at 240 K. The normalized afterglow spectra at different temperatures give a dramatic change of fluorescence intensity ratio between the blue band and the green band. Not only has this material exhibited a high absolute sensitivity and relative sensitivity for temperature sensing, but it also has the great advantage of eliminating the heating effect due to avoidance of real-time direct excitation...
August 15, 2018: Optics Letters
Yuexi Huang, Nir Lipsman, Michael L Schwartz, Vibhor Krishna, Francesco Sammartino, Andres M Lozano, Kullervo Hynynen
PURPOSE: To correlate the accumulated thermal dose (ATD) with lesion size in magnetic resonance (MR)-guided focused ultrasound (MRgFUS) thalamotomy to help guide future clinical treatments. MATERIALS AND METHODS: Thirty-six patients with medication-refractory essential tremor were treated using a commercial MRgFUS brain system (ExAblate 4000, InSightec) in a 3T MR scanner (MR750, GE Healthcare). Intraoperative MR-thermometry was performed to measure the induced temperature and thermal dose distributions (thermal coefficient = -0...
August 11, 2018: Medical Physics
Yuri Ivanov, Andrey F Kozlov, Rafael A Galiullin, Vadim Y Tatur, Vadim S Ziborov, Nina D Ivanova, Tatyana O Pleshakova, Sergey G Vesnin, Igor Goryanin
This study monitored thermal denaturation of albumin using microwave radiometry. Brightness Temperature, derived from Microwave Emission (BTME) of an aqueous solution of bovine serum albumin (0.1 mM) was monitored in the microwave frequency range 3.8-4.2 GHz during denaturation of this protein at a temperature of 56°C in a conical polypropylene cuvette. This method does not require fluorescent or radioactive labels. A microwave emission change of 1.5-2°C in the BTME of aqueous albumin solution was found during its denaturation, without a corresponding change in the water temperature...
2018: Frontiers in Physiology
Bryant T Svedin, Christopher R Dillon, Dennis L Parker
PURPOSE: To construct a predictive model that describes how the duration and symmetry of a k-space-weighted image contrast (KWIC) window affects the temporal resolution of differently sized ultrasound foci when using a pseudo-golden angle stack-of-stars acquisition. METHODS: We performed a modulation analysis of proton resonance frequency temperature measurements to create the temporal modulation transfer function for KWIC windows of different symmetry and temporal duration...
July 29, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Jeremy Tan, Charles Mougenot, Samuel Pichardo, James M Drake, Adam C Waspe
PURPOSE: High intensity focused ultrasound (HIFU) has the potential to locally and non-invasively treat cancer with fewer side effects than alternative therapies. However, motion and tissue heterogeneity in the abdomen can compromise the HIFU focus and confound current thermometry methods. METHODS: The proposed thermometry method combines principal component analysis (PCA), as a multi-baseline technique, and projection onto dipole fields (PDF), as a near-referenceless method...
July 29, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Eduardo D Martínez, Ricardo R Urbano, Carlos Rettori
Plasmon enhancement of luminescence is a common strategy to boost the efficiency of both fluorescence and upconversion via the augmented local electromagnetic field. However, the local heating produced when exciting the plasmon resonance of metallic nanoparticles is often overlooked. As higher temperatures are usually detrimental for radiative processes, only the electromagnetic contribution is exploited for enhancement. We show here that for small size (<20 nm) rare-earth doped β-NaGd(Y)F4 upconversion nanoparticles (UCNPs), the photothermal properties of gold nanostars (AuNSs) can be used to enhance the total emission intensity...
August 2, 2018: Nanoscale
Grace J Paik, Hiroko Henker, Susan Sereika, Sheila Alexander, Kathleen A Piotrowski, Nicole Appel, Li Meng, Nicholas Bircher, Richard Henker
PURPOSE: To evaluate the agreement of temporal artery temperature (Tat) with esophageal temperature (Tes) and oral temperature (Tor), and explore potential factors associated with the level of agreement between the thermometry methods in different clinical settings. DESIGN: A prospective repeated measures (induction, emergence, and postanesthesia care unit) design was used. METHODS: Temperature data were collected for 54 patients receiving general anesthesia...
July 19, 2018: Journal of Perianesthesia Nursing: Official Journal of the American Society of PeriAnesthesia Nurses
Twinkle Pandhi, Eric Kreit, Roberto Aga, Kiyo Fujimoto, Mohammad Taghi Sharbati, Samane Khademi, A Nicole Chang, Feng Xiong, Jessica Koehne, Emily M Heckman, David Estrada
This paper reports the first known investigation of power dissipation and electrical breakdown in aerosol-jet-printed (AJP) graphene interconnects. The electrical performance of aerosol-jet printed (AJP) graphene was characterized using the Transmission Line Method (TLM). The electrical resistance decreased with increasing printing pass number (n); the lowest sheet resistance measured was 1.5 kΩ/sq. for n = 50. The role of thermal resistance (RTH ) in power dissipation was studied using a combination of electrical breakdown thermometry and infrared (IR) imaging...
July 18, 2018: Scientific Reports
Mengzhu Li, Yong Shi, Chuanzhen Zhao, Fengming Yang, Qiuyue Li, Xinxing Zhang, Shengcheng Wu, Haiyan Chen, Junming Liu, Tong Wei
A series of Er3+- and Yb3+-doped K2LaNb5O15 (KLN:xEr3+/Yb3+) up-conversion (UC) submicro-particles have been synthesized for the first time by a simple and low-cost molten salt (MS) approach. X-ray diffraction (XRD) was performed to analyze the phase and structure, and the prepared KLN:xEr3+/Yb3+ samples exhibited a single phase tetragonal tungsten bronze (TTB) structure. The morphologies were characterized by scanning electron microscopy (SEM), and submicro-rod-like particles were obtained for all samples...
July 13, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Masfer H Alkahtani, Fahad Alghannam, Linkun Jiang, Arfaan A Rampersaud, Robert Brick, Carmen L Gomes, Marlan O Scully, Philip R Hemmer
Fluorescent nanodiamonds (FNDs) have attracted recent interest for biological applications owing to their biocompatibility and photostability (absence of photoblinking and bleaching). For optical thermometry, nitrogen-vacancy (NV) color centers and silicon-vacancy color centers in diamonds have demonstrated potential, where the NV has the highest sensitivity. However, NV is often excited with green light, which can cause heating and photodamage to tissues, as well as autofluorescence that decreases sensitivity...
July 15, 2018: Optics Letters
Paul C Lyon, Michael D Gray, Christophoros Mannaris, Lisa K Folkes, Michael Stratford, Leticia Campo, Daniel Y F Chung, Shaun Scott, Mark Anderson, Robert Goldin, Robert Carlisle, Feng Wu, Mark R Middleton, Fergus V Gleeson, Constantin C Coussios
BACKGROUND: Previous preclinical research has shown that extracorporeal devices can be used to enhance the delivery and distribution of systemically administered anticancer drugs, resulting in increased intratumoural concentrations. We aimed to assess the safety and feasibility of targeted release and enhanced delivery of doxorubicin to solid tumours from thermosensitive liposomes triggered by mild hyperthermia, induced non-invasively by focused ultrasound. METHODS: We did an open-label, single-centre, phase 1 trial in a single UK hospital...
July 9, 2018: Lancet Oncology
Can Li, Jianfei Sun, Qiwei Wang, Weiguo Zhang, Ning Gu
OBJECTIVE: A wireless, multi-channel system for realtime measurement of the cellular-temperature response to drugs is developed. METHODS: The acquisition system applies a highprecision reference resistor and a low real-time measurement current (below or equal to 0.14 mA) to reduce self-heating via the intermittent measurement. Cells of a small volume cell fluid are cultured on the surface of the platinum thermal resistor and subsequently measured in the incubator...
May 15, 2018: IEEE Transactions on Bio-medical Engineering
Ryan D Alkins, Todd G Mainprize
Ultrasound in clinical medicine is most commonly associated with imaging, but can be harnessed to yield an array of biological effects, including thermal ablation of brain tumors. Therapeutic ultrasound has been studied for many years, but only within the last decade has the technology reached a point where it is safe and practical for clinical adoption. Using large, multi-element arrays, ultrasound can be focused through the skull, and combined with MRI for image guidance and real-time thermometry, to create lesions in the brain with millimeter accuracy...
2018: Progress in Neurological Surgery
Ioannis Karampelas, Andrew E Sloan
Laser-induced interstitial thermotherapy (LITT) is a modern minimally invasive treatment modality applied for management of a variety of diseases. Recent developments of techniques for precise targeting of the lesion, accurate delivery of the prescribed therapeutically effective thermal doses, and real-time visualization of the induced tissue damage during the procedure by means of intraoperative MR thermometry have stimulated a number of clinical studies testing LITT in cases of different brain pathologies, including gliomas...
2018: Progress in Neurological Surgery
Amun Jarzembski, Sina Hamian, Jeonghoon Yun, Jacob Crossley, Inkyu Park, Mathieu Francoeur, Keunhan Park
This article reports the active control of a local hotspot temperature for accurate nanoscale thermal transport measurement. To this end, we have fabricated resistive on-substrate nanoheater/thermometer (NH/T) devices that have a sensing area of ∼350 nm × 300 nm. Feedback-controlled temporal heating and cooling experiments of the NH/T device confirm that the feedback integral gain plays a dominant role in device's response time for various setpoint temperatures. To further verify the integration of the feedback controller with the NH/T devices, a local tip-induced cooling experiment is performed by scanning a silicon tip over the hotspot area in an atomic force microscope platform...
June 2018: Review of Scientific Instruments
Amirhossein Behranginia, Zahra Hemmat, Arnab K Majee, Cameron J Foss, Poya Yasaei, Zlatan Aksamija, Amin Salehi-Khojin
The ongoing shrinkage in the size of two-dimensional (2D) electronic circuitry results in high power densities during device operation, which could cause a significant temperature rise within 2D channels. One challenge in Raman thermometry of 2D materials is that the commonly used high-frequency modes do not precisely represent the temperature rise in some 2D materials because of peak broadening and intensity weakening at elevated temperatures. In this work, we show that a low-frequency E2g 2 shear mode can be used to accurately extract temperature and measure thermal boundary conductance (TBC) in back-gated tungsten diselenide (WSe2 ) field-effect transistors, whereas the high-frequency peaks (E2g 1 and A1g ) fail to provide reliable thermal information...
July 25, 2018: ACS Applied Materials & Interfaces
Yuhong Peng, Chao Zou, Yangzi Qiao, Changjun Tie, Qian Wan, Rui Jiang, Chuanli Cheng, Dong Liang, Hairong Zheng, Faqi Li, Xin Liu
PURPOSE: Real-time monitoring is important for the safety and effectiveness of high-intensity focused ultrasound (HIFU) therapy. Magnetic resonance imaging is the preferred imaging modality for HIFU monitoring, with its unique capability of temperature imaging. For real-time temperature imaging, higher temporal resolution and larger spatial coverage are needed. In this study, a sequence based on the echo-shifted RF-spoiled gradient echo (GRE) with simultaneous multi-slice (SMS) imaging was designed for fast temperature imaging...
June 14, 2018: Magma
Santamaria Amato Luigi, Mario Siciliani de Cumis, Daniele Dequal, Giuseppe Bianco, Cancio Pastor Pablo
We propose a new independent thermometry method, line strength ratio thermometry (LRT), based on optical spectroscopy measurement of the line strength intensity ratio R between pairs of molecular transitions. Due to strong dependence of R on kT, a given measurement uncertainty δR for R reflects in a small uncertainty of kT determination. By assuming experimental uncertainties of R and T to be those reported in literature, we foresee a k determination at the 5 ppm level, which is better than the most precise k determination by using Doppler broadening thermometry (DBT)...
July 19, 2018: Journal of Physical Chemistry. A
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