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https://www.readbyqxmd.com/read/29457731/synthesis-of-structurally-diverse-emissive-molecular-rotors-with-four-component-ugi-stators
#1
Ma Carmen García-González, Andres Aguilar-Granda, Angel Zamudio-Medina, Luis D Miranda, Braulio Rodríguez-Molina
The use of the multicomponent Ugi reaction to rapidly prepare a library of dumbbell-like molecular rotors is highlighted here. The synthetic strategy consisted on the atom-economic access to fifteen bulky and structurally-diverse iodinated stators, which were cross coupled to the 1,4-diethynylphenylene rotator. From those experiments, up to six rotors 1a-c and 1l-n were obtained, with yields ranging from 35 to 69 % per coupled C-C bond. In addition to the frameworks diversity, five of these compounds showed Aggregate-Enhanced Emission properties thanks to their conjugated 1,4-bis-[(phenyl)ethynyl]benzene cores, a property that rises by increasing the water fraction (fw) in their THF solutions...
February 19, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29457188/divergent-synthesis-of-functionalized-pyrrolidines-and-%C3%AE-amino-ketones-via-rhodium-catalyzed-switchable-reactions-of-vinyl-aziridines-and-silyl-enol-ethers
#2
Chao-Ze Zhu, Jian-Jun Feng, Junliang Zhang
The control of reaction pathways for selective and enantiospecific synthesis of functionalized pyrrolidines and γ-amino ketones has been realized. Rhodium-catalyzed [3+2] cycloadditions of vinylaziridines and enolsilanes with a bulky silyl group gave functionalized pyrrolidines with moderate to excellent diastereoselectivities, while the reaction of silyl enol ethers with a less bulky silyl group afforded chiral γ-amino ketones in good yields.
February 19, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29455285/characterization-of-a-novel-miniaturized-burst-mode-infrared-laser-system-for-ir-maldesi-mass-spectrometry-imaging
#3
Måns Ekelöf, Jeffrey Manni, Milad Nazari, Mark Bokhart, David C Muddiman
Laser systems are widely used in mass spectrometry as sample probes and ionization sources. Mid-infrared lasers are particularly suitable for analysis of high water content samples such as animal and plant tissues, using water as a resonantly excited sacrificial matrix. Commercially available mid-IR lasers have historically been bulky and expensive due to cooling requirements. This work presents a novel air-cooled miniature mid-IR laser with adjustable burst-mode output and details an evaluation of its performance for mass spectrometry imaging...
February 17, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29445476/eccrine-porocarcinoma-arising-from-the-knee
#4
Kenji Gonda, Yuichi Hatakeyama, Yuichi Rokkaku
Enlarged eccrine porocarcinoma of the knee was encountered as a hemorrhagic bulky tumor. After controlling bleeding with Mohs' paste, local excision of the lesion was the mainstay of treatment. Pathological examination revealed poroid cells, cuticle cells, and prickle cells cancer components, suggesting that malignancy must be excluded by resection.
February 2018: Clinical Case Reports
https://www.readbyqxmd.com/read/29445216/evaluation-of-her2-specific-peptide-ligand-for-its-employment-as-radiolabeled-imaging-probe
#5
Hadis Honarvar, Enrica Calce, Nunzianna Doti, Emma Langella, Anna Orlova, Jos Buijs, Valentina D'Amato, Roberto Bianco, Michele Saviano, Vladimir Tolmachev, Stefania De Luca
HER2 transmembrane receptor is an important target in immunotherapy treatment of breast and gastroesophageal cancer. Molecular imaging of HER2 expression may provide essential prognostic and predictive information concerning disseminated cancer and aid in selection of an optimal therapy. Radiolabeled low molecular weight peptide ligands are particularly attractive as probes for molecular imaging, since they reach and bind to the target and clear from non-target organs and blood stream faster than bulky antibodies...
February 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29445198/phase-tuning-metasurface-for-circularly-polarized-broadside-radiation-in-broadband
#6
Youfei Zhang, Haogang Wang, Dashuang Liao, Weijie Fu
Metasurface antennas (MAs) have been proposed as innovative alternatives to conventional bulky configurations for satellite applications because of their low profile, low cost, and high gain. The general method of surface impedance modulation for designing MAs is complicated, and achieving broad operation bandwidth remains a challenge because of its high dispersion response. We propose a novel and easy technique to control cylindrical surface waves radiated by a phase-tuning metasurface. Simultaneously, this technique exhibits a considerably wide working bandwidth...
February 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29444074/self-crowding-of-ampa-receptors-in-the-excitatory-postsynaptic-density-can-effectuate-anomalous-receptor-sub-diffusion
#7
Rahul Gupta
AMPA receptors (AMPARs) and their associations with auxiliary transmembrane proteins are bulky structures with large steric-exclusion volumes. Hence, self-crowding of AMPARs, depending on the local density, may affect their lateral diffusion in the postsynaptic membrane as well as in the highly crowded postsynaptic density (PSD) at excitatory synapses. Earlier theoretical studies considered only the roles of transmembrane obstacles and the AMPAR-binding submembranous scaffold proteins in shaping receptor diffusion within PSD...
February 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29442061/unusual-presentation-of-retroperitoneal-schwannoma-case-report
#8
R Latino, Daniela Bosco, M E Frattallone, A Amico, R Lanteri, A Di Cataldo
Schwannoma is a rare tumor that develops from the Schwann cells in the nerve sheath. A 42 years old woman was found incidentally to have a bulky mass in epigastric region. Abdominal ultrasonography CT and MRI have been of aid to know the position and size of the tumor. A massive capsulated retroperitoneal lesion was identified. It moved forward the hepatoduodenal ligament, inferior vena cava laterally and aorta medially. The mass is exte-riorized and detached from adhesions. There were no complications after the operation and the patient was discharged on the fourth post-operative day...
November 2017: Il Giornale di Chirurgia
https://www.readbyqxmd.com/read/29441274/wafer-scale-bioactive-substrate-patterning-by-chemical-lift-off-lithography
#9
Chong-You Chen, Chang-Ming Wang, Hsiang-Hua Li, Hong-Hseng Chan, Wei-Ssu Liao
The creation of bioactive substrates requires an appropriate interface molecular environment control and adequate biological species recognition with minimum nonspecific attachment. Herein, a straightforward approach utilizing chemical lift-off lithography to create a diluted self-assembled monolayer matrix for anchoring diverse biological probes is introduced. The strategy encompasses convenient operation, well-tunable pattern feature and size, large-area fabrication, high resolution and fidelity control, and the ability to functionalize versatile bioarrays...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29441265/liquid-crystalline-nanoarchitectures-for-tissue-engineering
#10
REVIEW
Baeckkyoung Sung, Min-Ho Kim
Hierarchical orders are found throughout all levels of biosystems, from simple biopolymers, subcellular organelles, single cells, and macroscopic tissues to bulky organs. Especially, biological tissues and cells have long been known to exhibit liquid crystal (LC) orders or their structural analogues. Inspired by those native architectures, there has recently been increased interest in research for engineering nanobiomaterials by incorporating LC templates and scaffolds. In this review, we introduce and correlate diverse LC nanoarchitectures with their biological functionalities, in the context of tissue engineering applications...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29439915/probing-biological-activity-through-structural-modelling-of-ligand-receptor-interactions-of-2-4-disubstituted-thiazole-retinoids
#11
Hesham Haffez, David R Chisholm, Natalie J Tatum, Roy Valentine, Christopher Redfern, Ehmke Pohl, Andrew Whiting, Stefan Przyborski
Retinoids, such as all-trans-retinoic acid (ATRA), regulate cellular differentiation and signalling pathways in chordates by binding to nuclear retinoic acid receptors (RARα/β/γ). Polar interactions between receptor and ligand are important for binding and facilitating the non-polar interactions and conformational changes necessary for RAR-mediated transcriptional regulation. The constraints on activity and RAR-type specificity with respect to the structural link between the polar and non-polar functions of synthetic retinoids are poorly understood...
February 10, 2018: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/29439882/radiation-therapy-to-sites-of-metastatic-disease-as-part-of-consolidation-in-high-risk-neuroblastoma-can-long-term-control-be-achieved
#12
Dana L Casey, Ken L Pitter, Brian H Kushner, Nai-Kong V Cheung, Shakeel Modak, Michael P LaQuaglia, Suzanne L Wolden
PURPOSE: As part of consolidative therapy in high-risk neuroblastoma, modern protocols recommend radiation therapy (RT) both to the primary site and to sites of metastatic disease that persist after induction chemotherapy. Although there are abundant data showing excellent local control (LC) with 21 Gy directed at the primary site, there are few data describing the feasibility and efficacy of RT directed at metastatic sites of disease as part of consolidation. METHODS AND MATERIALS: All patients with neuroblastoma who received RT to metastatic sites of disease as a part of consolidative therapy at a single institution between 2000 and 2015 were reviewed...
January 9, 2018: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/29437440/metasurface-for-water-to-air-sound-transmission
#13
Eun Bok, Jong Jin Park, Haejin Choi, Chung Kyu Han, Oliver B Wright, Sam H Lee
Effective transmission of sound from water to air is crucial for the enhancement of the detection sensitivity of underwater sound. However, only 0.1% of the acoustic energy is naturally transmitted at such a boundary. At audio frequencies, quarter-wave plates or multilayered antireflection coatings are too bulky for practical use for such enhancement. Here we present an acoustic metasurface of a thickness of only ∼λ/100, where λ is the wavelength in air, consisting of an array of meta-atoms that each contain a set of membranes and an air-filled cavity...
January 26, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29434666/life-cycle-assessment-of-transportation-biofuels-from-hydrothermal-liquefaction-of-forest-residues-in-british-columbia
#14
Yuhao Nie, Xiaotao Bi
Background: Biofuels from hydrothermal liquefaction (HTL) of abundantly available forest residues in British Columbia (BC) can potentially make great contributions to reduce the greenhouse gas (GHG) emissions from the transportation sector. A life-cycle assessment was conducted to quantify the GHG emissions of a hypothetic 100 million liters per year HTL biofuel system in the Coast Region of BC. Three scenarios were defined and investigated, namely, supply of bulky forest residues for conversion in a central integrated refinery (Fr-CIR), HTL of forest residues to bio-oil in distributed biorefineries and subsequent upgrading in a central oil refinery (Bo-DBR), and densification of forest residues in distributed pellet plants and conversion in a central integrated refinery (Wp-CIR)...
2018: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/29434246/high-throughput-protease-profiling-comprehensively-defines-active-site-specificity-for-thrombin-and-adamts13
#15
Colin A Kretz, Kärt Tomberg, Alexander Van Esbroeck, Andrew Yee, David Ginsburg
We have combined random 6 amino acid substrate phage display with high throughput sequencing to comprehensively define the active site specificity of the serine protease thrombin and the metalloprotease ADAMTS13. The substrate motif for thrombin was determined by >6,700 cleaved peptides, and was highly concordant with previous studies. In contrast, ADAMTS13 cleaved only 96 peptides (out of >107 sequences), with no apparent consensus motif. However, when the hexapeptide library was substituted into the P3-P3' interval of VWF73, an exosite-engaging substrate of ADAMTS13, 1670 unique peptides were cleaved...
February 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29431893/does-charge-matter-formation-of-highly-reactive-cobalt-nanocluster-crystal-within-highly-negative-porous-coordination-cage
#16
Yu Fang, Zhifeng Xiao, Jialuo Li, Christina Lollar, Lujia Liu, Xizhen Lian, Shuai Yuan, Sayan Banerjee, Peng Zhang, Hongcai Zhou
Earth abundant first-row transition-metal nanoclusters (NCs) have been extensively investigated as catalysts. However, their catalytic activity is relatively low compared with noble metal NCs. In this work we show that enhanced catalytic activity of cobalt NCs can be achieved by encapsulating Co NCs in soluble porous coordination cages. Two cages, PCC-2a and 2b, possess almost identical cavity in shape and size, while PCC-2a has five times more net charges than PCC-2b. Co2+ cations were accumulated in PCC-2a and reduced to Co NCs in situ, while for PCC-2b, only bulky Co particles were formed...
February 12, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29431867/spatially-fractionated-grid-radiation-therapy-using-proton-pencil-beam-scanning-pbs-feasibility-study-and-clinical-implementation
#17
M Gao, M M Mohiuddin, W F Hartsell, M Pankuch
PURPOSE: GRID therapy is an effective treatment for bulky tumors. Linear accelerator (Linac)-produced photon beams collimated through blocks or multi-leaf collimators (MLCs) are the most common methods used to deliver this therapy. Utilizing the newest proton delivery method of pencil beam scanning (PBS) can further improve the efficacy of GRID therapy. In this study, we developed a method of delivering GRID therapy using proton PBS, evaluated the dosimetry of this novel technique and applied this method in two clinical cases...
February 12, 2018: Medical Physics
https://www.readbyqxmd.com/read/29429095/imaging-of-single-dye-labeled-chemotaxis-proteins-in-live-bacteria-using-electroporation
#18
Diana Di Paolo, Richard M Berry
For the last 2 decades, the use of genetically fused fluorescent proteins (FPs) has greatly contributed to the study of chemotactic signaling in E. coli, including the activation of the response regulator protein CheY and its interaction with the flagellar motor. However, this approach suffers from a number of limitations, both biological and biophysical. For example, not all fusions are fully functional when fused to a bulky FP, which can have a similar molecular weight to its fused counterpart. FPs may interfere with the native interactions of the protein, and their chromophores have low brightness and photostability, and fast photobleaching rates...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29426744/improving-dose-delivery-by-adding-interstitial-catheters-to-fixed-geometry-applicators-in-high-dose-rate-brachytherapy-for-cervical-cancer
#19
Sophie Otter, Amanda Coates, Adrian Franklin, Melanie Cunningham, Alexandra Stewart
PURPOSE: Image-guided brachytherapy (IGBT) is an essential component of the treatment of locally advanced cervical cancer. Interstitial (IS) catheters are being increasingly used for bulkier tumors. We have retrospectively assessed the dosimetric impact of IS catheters. METHODS AND MATERIALS: All patients who received IGBT for cervical cancer between August 2014 and February 2017 were identified. Clinical and dosimetric data were collected. Patients were grouped into the intracavitary (IC) cohort or the IC and IS implant (IC/IS) cohort...
February 6, 2018: Brachytherapy
https://www.readbyqxmd.com/read/29424381/liquid-metal-based-amalgamation-assisted-lithography-for-fabrication-of-complex-channels-with-diverse-structures-and-configurations
#20
Sheng Yan, Yuxing Li, Qianbin Zhao, Dan Yuan, Guolin Yun, Jun Zhang, Weijia Wen, Shi-Yang Tang, Weihua Li
Numerous lab-on-a-chip applications benefit from channels with complex structures and configurations in the areas of tissue engineering and clinical diagnostics. The current fabrication approaches require time-consuming, complicated processes and bulky, expensive facilities. In this work, we propose a novel method for the fabrication of complex channels with the assistance of amalgamation of liquid metal with copper tape. This new technique enables the rapid fabrication of liquid metal molds with various dimensions and diverse structures...
February 9, 2018: Lab on a Chip
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