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https://www.readbyqxmd.com/read/28650618/solution-and-solid-state-correlations-of-antimalarial-drug-actions-nmr-and-crystallographic-studies-of-drug-interactions-with-a-heme-model
#1
Erin L Dodd, Dagobert Tazoo, D Scott Bohle
Solution NMR has been used in tandem with a diamagnetic non-iron heme model compound as a simple and effective tool to rapidly probe the structures of the bound complexes formed between the metalloporphyrin and antimalarial drugs from the 4-aminoquinoline, 4-methylenehydroxylquinoline, and 8-aminoquinoline subfamilies. The ability of gallium(III) protoporphyrin IX to mimic heme chemistry is exploited. The 4-aminoquinolines quinacrine and amodiaquine and two novel 3-halo chloroquine analogues are found to bind to the metalloporphyrin through hydrogen-bonding and stacking interactions, while halofantrine and the 4-methylenehydroxylquinolines, quinine and mefloquine bind through the alcohol group of the drug...
June 26, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28649735/diagnostic-sensitivity-of-tc-99m-hynic-psma-spect-ct-in-prostate-carcinoma-a-comparative-analysis-with-ga-68-psma-pet-ct
#2
Ismaheel O Lawal, Alfred O Ankrah, Neo P Mokgoro, Mariza Vorster, Alex Maes, Mike M Sathekge
BACKGROUND: Emerging data from published studies are demonstrating the superiority of Ga-68 PSMA PET/CT imaging in prostate cancer. However, the low yield of the Ge-68/Ga-68 from which Gallium-68 is obtained and fewer installed PET/CT systems compared to the SPECT imaging systems may limit its availability. We, therefore, evaluated in a head-to-head comparison, the diagnostic sensitivity of Ga-68 PSMA PET/CT and Tc-99m PSMA SPECT/CT in patients with prostate cancer. METHODS: A total of 14 patients with histologically confirmed prostate cancer were prospectively recruited to undergo Ga-68 PSMA PET/CT and Tc-99m HYNIC PSMA SPECT/CT...
June 26, 2017: Prostate
https://www.readbyqxmd.com/read/28644492/electronic-properties-of-blue-phosphorene-graphene-and-blue-phosphorene-graphene-like-gallium-nitride-heterostructures
#3
Minglei Sun, Jyh-Pin Chou, Jin Yu, Wencheng Tang
Blue phosphorene (BlueP) is a graphene-like phosphorus nanosheet which was synthesized very recently for the first time [Nano Lett., 2016, 16, 4903-4908]. The combination of electronic properties of two different two-dimensional materials in an ultrathin van der Waals (vdW) vertical heterostructure has been proved to be an effective approach to the design of novel electronic and optoelectronic devices. Therefore, we used density functional theory to investigate the structural and electronic properties of two BlueP-based heterostructures - BlueP/graphene (BlueP/G) and BlueP/graphene-like gallium nitride (BlueP/g-GaN)...
June 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28644010/atomic-layer-deposition-of-indium-gallium-oxide-thin-film-for-thin-film-transistor-applications
#4
Jiazhen Sheng, Eun Jung Park, Bonggeun Shong, Jin-Seong Park
Indium gallium oxide (IGO) thin films were deposited via atomic layer deposition (ALD) using [1,1,1-trimethyl-N-(trimethylsilyl)silanaminato]indium (InCA-1) and trimethylgallium (TMGa) as indium and gallium precursors, respectively, and hydrogen peroxide (H2O2) as the reactant. In order to clearly understand the mechanism of multicomponent ALD growth of oxide semiconductor materials, several variations in the precursor-reactant deposition cycles were evaluated. Gallium could be doped into oxide film at 200°C when accompanied by an InCA-1 pulse, and no growth of gallium oxide was observed without the simultaneous deposition of indium oxide...
June 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28633261/mediastinal-abscess-caused-by-an-expanded-polytetrafluoroethylene-membrane
#5
Kanji Matsuzaki, Toru Tsukada, Masataka Sato, Yasunori Watanabe, Akihiko Ikeda, Taisuke Konishi, Tomoaki Jikuya
A 76-year-old man who had undergone tricuspid annuloplasty 13 years earlier was admitted to our hospital because of a high fever. Although he was treated with antibiotics for pneumonia, a mild fever persisted. Computed tomography and gallium scintigraphy revealed a mediastinal abscess with an expanded polytetrafluoroethylene (ePTFE) membrane. There were no positive cultures or sternal changes indicating poststernotomy mediastinitis. The membrane was removed by a left parasternal approach without resternotomy, and its total removal was essential for the patient's recovery...
July 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28624910/clinical-pharmacology-and-clinical-trials-of-ribonucleotide-reductase-inhibitors-is-it-a-viable-cancer-therapy
#6
REVIEW
Mukundan Baskar Mannargudi, Subrata Deb
PURPOSE: Ribonucleotide reductase (RR) enzymes (RR1 and RR2) play an important role in the reduction of ribonucleotides to deoxyribonucleotides which is involved in DNA replication and repair. Augmented RR activity has been ascribed to uncontrolled cell growth and tumorigenic transformation. METHODS: This review mainly focuses on several biological and chemical RR inhibitors (e.g., siRNA, GTI-2040, GTI-2501, triapine, gemcitabine, and clofarabine) that have been evaluated in clinical trials with promising anticancer activity from 1960's till 2016...
June 17, 2017: Journal of Cancer Research and Clinical Oncology
https://www.readbyqxmd.com/read/28623600/stability-of-rolled-up-gaas-nanotubes
#7
Júnio C F Silva, José D Dos Santos, Carlton A Taft, João B L Martins, Elson Longo
This work presents a theoretical study of gallium arsenide (GaAs) nanotubes obtained from the (100), (110) and (111) crystal planes of zincblende structure in order to evaluate the electronic properties. The DFT/B3LYP/6-31G method was used to predict structures and stabilities. It was found that nanotubes from the (110) crystal plane tended to be the most stable. The results for average diameter and bond length obtained for optimized nanotube geometries show that nanotubes constructed from the (100) plane have a hyperbolic format, while (110) or (111) nanotubes have a conical format...
July 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28621567/-68-ga-radiolabeled-aguix-nanoparticles-as-dual-modality-imaging-agents-for-pet-mri-guided-radiation-therapy
#8
Penelope Bouziotis, Dimitris Stellas, Eloïse Thomas, Charles Truillet, Charalampos Tsoukalas, François Lux, Theodoros Tsotakos, Stavros Xanthopoulos, Maria Paravatou-Petsotas, Anastasios Gaitanis, Lia Angela Moulopoulos, Vassilis Koutoulidis, Constantinos D Anagnostopoulos, Olivier Tillement
AIM: The aim of this study was to develop a dual-modality positron emission tomography/magnetic resonance (PET/MR) imaging probe by radiolabeling gadolinium-containing AGuIX derivatives with the positron-emitter Gallium-68 ((68)Ga). MATERIALS & METHODS: AGuIX@NODAGA nanoparticles were labeled with (68)Ga at high efficiency. Tumor accumulation in an appropriate disease model was assessed by ex vivo biodistribution and in vivo PET/MR imaging. RESULTS:  (68)Ga-AGuIX@NODAGA was proven to passively accumulate in U87MG human glioblastoma tumor xenografts...
June 16, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28613302/all-soft-battery-free-and-wireless-chemical-sensing-platform-based-on-liquid-metal-for-liquid-and-gas-phase-voc-detection
#9
Min-Gu Kim, Hommood Alrowais, Choongsoon Kim, Pyungwoo Yeon, Maysam Ghovanloo, Oliver Brand
Lightweight, flexible, stretchable, and wireless sensing platforms have gained significant attention for personal healthcare and environmental monitoring applications. This paper introduces an all-soft (flexible and stretchable), battery-free, and wireless chemical microsystem using gallium-based liquid metal (eutectic gallium-indium alloy, EGaIn) and poly(dimethylsiloxane) (PDMS), fabricated using an advanced liquid metal thin-line patterning technique based on soft lithography. Considering its flexible, stretchable, and lightweight characteristics, the proposed sensing platform is well suited for wearable sensing applications either on the skin or on clothing...
June 14, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28609719/near-infrared-photoluminescence-biosensing-platform-with-gold-nanorods-over-gallium-arsenide-nanohorn-array
#10
Yiming Zhang, Tao Jiang, Longhua Tang
The near-infrared (NIR) optical detection of biomolecules with high sensitivity and reliability have been expected, however, it is still a challenge. In this work, we present a gold nanorods (AuNRs)-over-gallium arsenide nanohorn-like array (GaAs NHA) system that can be used for the ultrasensitive and specific NIR photoluminescence (PL) detection of DNA and proteins. The fabrication of GaAs NHA involved the technique of colloidal lithography and inductively coupled plasma dry etching, yielding large-area and well-defined nanostructural array, and exhibiting an improved PL emission compared to the planar GaAs substrate...
June 7, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28607878/targeted-prostate-biopsy-using-68-gallium-psma-pet-ct-for-image-guidance
#11
Demetrios N Simopoulos, Shyam Natarajan, Tonye A Jones, Wolfgang P Fendler, Anthony E Sisk, Leonard S Marks
Prostate specific membrane antigen (PSMA) scanning is a sensitive method of prostate cancer detection. In a 71 y.o. man with a PSA of 49 (6%F), 4 negative MRI studies and 6 negative biopsies over an 8 year interval, a (68)Ga-PSMA PET/CT scan showed a PSMA-avid spot in the prostate. Using image fusion technology, the lesion was target-biopsied and Gleason 3 + 4 = 7 (cancer core length of 12 mm) was identified. This case may herald a new application for PSMA scanning and prostate cancer imaging.
September 2017: Urology Case Reports
https://www.readbyqxmd.com/read/28605318/supramolecular-delivery-systems-for-non-platinum-metal-based-anticancer-drugs
#12
Paola Ringhieri, Giancarlo Morelli, Antonella Accardo
Stimulated by the enormous success of the inorganic complex cisplatin in tumor treatment, interest in metal complexes has recently grown. Within cells, metal complexes can participate in reactions that are not possible with conventional organic substances, and most of them have promising efficacy as anticancer drugs. However, to be effective in vivo metal complexes need adequate delivery systems able to increase their water solubility, the in vivo bioavailability, and the safe delivery to target organs. The present review reports on the state of the art of these new, nonplatinum, anticancer metallodrugs delivered by nanosized vehicles...
2017: Critical Reviews in Therapeutic Drug Carrier Systems
https://www.readbyqxmd.com/read/28585526/quantum-trajectory-analysis-for-charge-transfer-in-solid-materials-induced-by-strong-laser-fields
#13
Shicheng Jiang, Chao Yu, Guanglu Yuan, Tong Wu, Ziwen Wang, Ruifeng Lu
We investigate the dependence of charge transfer on the intensity of driving laser field when SiO2 crystal is irradiated by an 800 nm laser. It is surprising that the direction of charge transfer undergoes a sudden reversal when the driving laser intensity exceeds critical values with different carrier-envelope phases. By applying quantum-trajectory analysis, we find that the Bloch oscillation plays an important role in charge transfer in solids. Also, we study the interaction of a strong laser with gallium nitride (GaN), which is widely used in optoelectronics...
July 12, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28580116/shape-transformable-liquid-metal-nanoparticles-in-aqueous-solution
#14
Yiliang Lin, Yang Liu, Jan Genzer, Michael D Dickey
Stable suspensions of eutectic gallium indium (EGaIn) liquid metal nanoparticles form by probe-sonicating the metal in an aqueous solution. Positively-charged molecular or macromolecular surfactants in the solution, such as cetrimonium bromide or lysozyme, respectively, stabilize the suspension by interacting with the negative charges of the surface oxide that forms on the metal. The liquid metal breaks up into nanospheres via sonication, yet can transform into rods of gallium oxide monohydroxide (GaOOH) via moderate heating in solution either during or after sonication...
May 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28576423/-pet-ct-and-biochemical-recurrence-of-prostate-adenocarcinoma-added-value-of-68-ga-psma-11-when-18-f-fluorocholine-is-non-contributive
#15
M Gauthé, O Belissant, A Girard, J Zhang Yin, J Ohnona, A-S Cottereau, V Nataf, S Balogova, D Pontvert, T Lebret, B Guillonneau, O Cussenot, J-N Talbot
INTRODUCTION: Since April 201, we have introduced PET/CT using a ligand of prostate-specific membrane antigen labeled with gallium-68 (PSMA-11). We aimed to evaluate its positivity rate and impact in patients presenting biochemical recurrence of prostate cancer whose (18)F-fluorocholine (FCH) PET/CT was non-contributive. PATIENTS AND METHOD: Patients were prospectively included between April and December 2016. PET/CT was performed 60min after injection of 2MBq/kg of body mass of (68)Ga-PSMA-11...
June 2017: Progrès en Urologie
https://www.readbyqxmd.com/read/28574714/fast-growth-of-gan-epilayers-via-laser-assisted-metal-organic-chemical-vapor-deposition-for-ultraviolet-photodetector-applications
#16
Hossein Rabiee Golgir, Da Wei Li, Kamran Keramatnejad, Qi Ming Zou, Jun Xiao, Fei Wang, Lan Jiang, Jean-François Silvain, Yong Feng Lu
In this study, we successfully developed a carbon dioxide (CO2)-laser-assisted metal-organic chemical vapor deposition (LMOCVD) approach to fast synthesis of high-quality gallium nitride (GaN) epilayers on Al2O3 [sapphire(0001)] substrates. By employing a two-step growth procedure, high crystallinity and smooth GaN epilayers with a fast growth rate of 25.8 μm/h were obtained. The high crystallinity was confirmed by a combination of techniques, including X-ray diffraction, Raman spectroscopy, transmission electron microscopy, and atomic force microscopy...
June 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28571805/gallium-and-silicon-synergistically-promote-osseointegration-of-dental-implant-in-patients-with-osteoporosis
#17
Jinsong Liu, Zuosu Wu, Hongli He, Kaiyong Cai, Hualin Zhang, Lihua Xu
Over the last few decades, a wide variety of dental implants have been successfully placed in jaw bones to restore tooth function. But major challenges still remain in patients with osteoporosis involving compromised osseointegration, and the therapeutic methods is far from optimism. Gallium can directly inhibit bone osteolysis, prevent bone calcium release and augment bone mass, which makes Ga unique among the potential antiresorptive drugs. Silicon, as an indispensable modulator in bone formation, presents its bone anabolic effects, while reduces, at least doesn't increase, bone resorption...
June 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28571441/filter-based-ultralow-frequency-raman-measurement-down-to-2-cm-1-for-fast-brillouin-spectroscopy-measurement
#18
Xue-Lu Liu, He-Nan Liu, Jiang-Bin Wu, Han-Xu Wu, Tao Zhang, Wei-Qian Zhao, Ping-Heng Tan
Simultaneous Stokes and anti-Stokes ultralow-frequency (ULF) Raman measurement down to ∼2 cm(-1) or 60 GHz is realized by a single-stage spectrometer in combination with volume-Bragg-grating-based notch filters. This system reveals its excellent performance by probing Brillouin signal of acoustic phonons in silicon, germanium, gallium arsenide, and gallium nitride. The deduced sound velocity and elastic constants are in good accordance with previous results determined by various methods. This system can shorten the integration time of the Brillouin signal with a good signal-to-noise ratio by more than 2000-fold compared to a Fabry-Perot interferometer (FPI)...
May 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28569879/nanosecond-difference-frequency-generation-in-orientation-patterned-gallium-phosphide
#19
Junxiong Wei, S Chaitanya Kumar, Hanyu Ye, Kavita Devi, Peter G Schunemann, M Ebrahim-Zadeh
We report a tunable, single-pass, pulsed nanosecond difference-frequency generation (DFG) source based on the new semiconductor nonlinear material, orientation-patterned gallium phosphide (OP-GaP). The DFG source is realized by mixing the output signal of a nanosecond OPO tunable over 1723-1827 nm with the input pump pulses of the same OPO at 1064 nm in an OP-GaP crystal, resulting in tunable generation over 233 nm in the mid-infrared from 2548 to 2781 nm. Using a 40-mm-long crystal, we have produced ∼14  mW of average DFG output power at 2719 nm for a pump power of 5 W and signal power of 1 W at 80 kHz repetition rate...
June 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28569767/large-spin-accumulation-and-crystallographic-dependence-of-spin-transport-in-single-crystal-gallium-nitride-nanowires
#20
Tae-Eon Park, Youn Ho Park, Jong-Min Lee, Sung Wook Kim, Hee Gyum Park, Byoung-Chul Min, Hyung-Jun Kim, Hyun Cheol Koo, Heon-Jin Choi, Suk Hee Han, Mark Johnson, Joonyeon Chang
Semiconductor spintronics is an alternative to conventional electronics that offers devices with high performance, low power and multiple functionality. Although a large number of devices with mesoscopic dimensions have been successfully demonstrated at low temperatures for decades, room-temperature operation still needs to go further. Here we study spin injection in single-crystal gallium nitride nanowires and report robust spin accumulation at room temperature with enhanced spin injection polarization of 9%...
June 1, 2017: Nature Communications
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