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https://www.readbyqxmd.com/read/29675937/a-new-family-of-photoluminescent-polymers-with-dual-chromophores
#1
Chenxi Hu, Zhaoyan Guo, Yue Ru, Wenbo Song, Zhenjie Liu, Xiaohong Zhang, Jinliang Qiao
A new family of photoluminescent polymers with dual chromophores is prepared in this study by using poly(maleic anhydride-alt-vinyl acetate), acetone, and metal hydroxide. These polymers, which contain both bulky carboxylic ester groups and metal carboxylate groups, are found to be dual-emission photoluminescent, with a blue luminescence excitation-dependent group and a red luminescence excitation-independent group. These photoluminescence polymers with a nonconjugated structure and dual chromophores also show characteristics of aggregation-induced emission (AIE)...
April 20, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29675217/polyoxovanadate-alkoxide-clusters-as-multi-electron-charge-carriers-for-symmetric-non-aqueous-redox-flow-batteries
#2
L E VanGelder, A M Kosswattaarachchi, P L Forrestel, T R Cook, E M Matson
Non-aqueous redox flow batteries have emerged as promising systems for large-capacity, reversible energy storage, capable of meeting the variable demands of the electrical grid. Here, we investigate the potential for a series of Lindqvist polyoxovanadate-alkoxide (POV-alkoxide) clusters, [V6 O7 (OR)12 ] (R = CH3 , C2 H5 ), to serve as the electroactive species for a symmetric, non-aqueous redox flow battery. We demonstrate that the physical and electrochemical properties of these POV-alkoxides make them suitable for applications in redox flow batteries, as well as the ability for ligand modification at the bridging alkoxide moieties to yield significant improvements in cluster stability during charge-discharge cycling...
February 14, 2018: Chemical Science
https://www.readbyqxmd.com/read/29675199/formation-of-macrocyclic-ring-systems-by-carbonylation-of-trifunctional-p-b-b-frustrated-lewis-pairs
#3
Long Wang, Shunxi Dong, Constantin G Daniliuc, Lei Liu, Stefan Grimme, Robert Knitsch, Hellmut Eckert, Michael Ryan Hansen, Gerald Kehr, Gerhard Erker
The trifunctional P/B/B frustrated Lewis pairs 11a-c featuring bulky aryl groups at phosphorus [Dmesp ( a ), Tipp ( b ), Mes* ( c )] react with H2 by heterolytic hydrogen splitting followed by cleavage of HB(C6 F5 )2 to give the zwitterionic six-membered heterocyclic PH phosphonium/borate products 14a-c . Compounds 11a,b react with carbon monoxide by means of a Lewis acid induced CO insertion/rearrangement sequence that eventually results in the formation of the macrocyclic dimers 17a,b . The respective carbonylation reaction of the Mes*P/B/B FLP gives the macrocyclic trimer 18c ...
February 14, 2018: Chemical Science
https://www.readbyqxmd.com/read/29672964/metasurface-enabled-wide-angle-fourier-lens
#4
Wenwei Liu, Zhancheng Li, Hua Cheng, Chengchun Tang, Junjie Li, Shuang Zhang, Shuqi Chen, Jianguo Tian
Fourier optics, the principle of using Fourier transformation to understand the functionalities of optical elements, lies at the heart of modern optics, and it has been widely applied to optical information processing, imaging, holography, etc. While a simple thin lens is capable of resolving Fourier components of an arbitrary optical wavefront, its operation is limited to near normal light incidence, i.e., the paraxial approximation, which puts a severe constraint on the resolvable Fourier domain. As a result, high-order Fourier components are lost, resulting in extinction of high-resolution information of an image...
April 19, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29671827/molecular-modeling-studies-on-carbazole-carboxamide-based-btk-inhibitors-using-docking-and-structure-based-3d-qsar
#5
Rui Li, Yongli Du, Zhipei Gao, Jingkang Shen
Rheumatoid arthritis (RA) is the second common rheumatic immune disease with chronic, invasive inflammatory characteristics. Non-steroidal anti-inflammatory drugs (NSAIDs), slow-acting anti-rheumatic drugs (SAARDs), or glucocorticoid drugs can improve RA patients’ symptoms, but fail to cure. Broton’s tyrosine kinase (BTK) inhibitors have been proven to be an efficacious target against autoimmune indications and B-cell malignancies. Among the current 11 clinical drugs, only BMS-986142, classified as a carbazole derivative, is used for treating RA...
April 19, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29670770/genetic-variants-associated-with-hyperandrogenemia-in-pcos-pathophysiology
#6
REVIEW
Roshan Dadachanji, Nuzhat Shaikh, Srabani Mukherjee
Polycystic ovary syndrome is a multifactorial endocrine disorder whose pathophysiology baffles many researchers till today. This syndrome is typically characterized by anovulatory cycles and infertility, altered gonadotropin levels, obesity, and bulky multifollicular ovaries on ultrasound. Hyperandrogenism and insulin resistance are hallmark features of its complex pathophysiology. Hyperandrogenemia is a salient feature of PCOS and a major contributor to cosmetic anomalies including hirsutism, acne, and male pattern alopecia in affected women...
2018: Genetics Research International
https://www.readbyqxmd.com/read/29669502/synthetic-diethyl-2-6-dimethyl-1-4-dihydropyridine-3-5-dicarboxylates-induce-apoptosis
#7
Seunghyun Ahn, Youngshim Lee, Jihyun Park, Junho Lee, Soon Young-Shin, Young Han Lee, Dongsoo Koh, Yoongho Lim
BACKGROUND: The Hantzsch ester, diethyl 2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate, has been used as a hydride donor and its various biological effects have been reported. To identify chemotherapeutic agents with apoptotic effects, 21 diethyl 2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylates were designed and synthesized; they have not been reported as apoptosis inducers thus far. Their structure-cytotoxicity relationships were investigated. Further biological experiments were performed on the title compound...
April 18, 2018: Medicinal Chemistry
https://www.readbyqxmd.com/read/29669209/ros-responsive-chalcogen-containing-polycarbonates-for-photodynamic-therapy
#8
Li Yu, Yue Yang, Fu-Sheng Du, Zi-Chen Li
Reactive oxygen species (ROS)-responsive polymers have attracted attention for their potential in photodynamic therapy. Herein, we report the ROS-responsive aliphatic polycarbonates prepared by the ring-opening polymerization (ROP) of three six-membered cyclic carbonate monomers with ethyl selenide, phenyl selenide or ethyl telluride groups. Under catalysis of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), all three monomers underwent the controlled anionic ROP, showing a feature of equilibrium polymerization due to the bulky effect of 5,5-disubstituents...
April 18, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29668367/which-patients-with-cervical-squamous-cell-carcinoma-might-benefit-from-neoadjuvant-chemotherapy
#9
Omar Mahmoud, Mark H Einstein
The Oncology Grand Rounds series is designed to place original reports published in the Journal into clinical context. A case presentation is followed by a description of diagnostic and management challenges, a review of the relevant literature, and a summary of the authors' suggested management approaches. The goal of this series is to help readers better understand how to apply the results of key studies, including those published in Journal of Clinical Oncology, to patients seen in their own clinical practice...
April 18, 2018: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/29667599/sensitive-singular-phase-optical-detection-without-phase-measurements-with-tamm-plasmons
#10
Svetlana V Boriskina, Yoichiro Tsurimaki
Spectrally-tailored interactions of light with material interfaces offer many exciting applications in sensing, photo-detection, and optical energy conversion. In particular, complete suppression of light reflectance at select frequencies accompanied by sharp phase variations in the reflected signal forms the basis for the development of ultra-sensitive singular-phase optical detection schemes such as Brewster and surface plasmon interferometry. However, both the Brewster effect and surface-plasmon-mediated absorption on planar interfaces are limited to one polarization of the incident light and oblique excitation angles, and may have limited bandwidth dictated by the material dielectric index and plasma frequency...
April 18, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29667283/a-bulky-diamine-ligand-promoted-cross-coupling-with-difluoroalkyl-bromides-via-iron-catalysis
#11
Xingang Zhang, Lun An, Yu-Lan Xiao, Shu Zhang
Although iron-catalyzed cross-coupling of Grignard reagents with alkyl halides has been well established, the adoption of the reaction for fluoroalkylations has not been reported because traditional catalytic systems often lead to defluorination reactions. Here, we describe our investigation of an iron-catalyzed cross-coupling between arylmagnesium and difluoroalkyl bromides with steric modified N,N,N',N'-tetramethyl-ethane-1,2-diamine (TMEDA) (L4) as a ligand. The use of a bulky diamine ligand (L4), in which a butylene is substituted at one carbon atom of ethylene backbone in TMEDA, enables the iron-catalyzed difluoroalkylation under mild reaction conditions with a wide range of difluoroalkyl bromides including vulnerable bromodifluoromethane, thus providing a general and cost-efficient route for application in medicinal chemistry...
April 17, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29666379/genome-wide-excision-repair-in-arabidopsis-is-coupled-to-transcription-and-reflects-circadian-gene-expression-patterns
#12
Onur Oztas, Christopher P Selby, Aziz Sancar, Ogun Adebali
Plants are exposed to numerous DNA-damaging stresses including the exposure to ultraviolet (UV) component of solar radiation. They employ nucleotide excision repair to remove DNA-bulky adducts and to help eliminate UV-induced DNA lesions, so as to maintain their genome integrity and their fitness. Here, we generated genome-wide single-nucleotide resolution excision repair maps of UV-induced DNA damage in Arabidopsis at different circadian time points. Our data show that the repair of UV lesions for a large fraction of the genome is controlled by the joint actions of the circadian clock and transcription by RNA polymerase II...
April 17, 2018: Nature Communications
https://www.readbyqxmd.com/read/29664802/free-thoracoacromial-artery-perforator-flap-for-skin-defects-of-the-dorsal-hand
#13
Satoshi Kodaira, Keizo Fukumoto, Naoki Kato
Various flaps are used for skin defects of the dorsal hand and fingers. A sensory flap is not essential, but a thin and good color-matched flap is suitable, and donor site mobility of the flap should be considered. A reverse or free posterior interosseous artery perforator flap is one of the standard flaps. This flap requires no major arterial sacrifice, but direct closure of the donor site is difficult when the width of the flap is >3 cm, and there is also the risk of posterior interosseous nerve injury, especially the motor branch of the extensor carpi ulnaris muscle...
April 16, 2018: Techniques in Hand & Upper Extremity Surgery
https://www.readbyqxmd.com/read/29661053/differential-diagnosis-of-sinonasal-lymphoma-and-squamous-cell-carcinoma-on-ct-mri-and-pet-ct
#14
Seok-Hyun Kim, Sue-Jean Mun, Hak-Jin Kim, Seon Lin Kim, Sung-Dong Kim, Kyu-Sup Cho
Objective The purpose of this study was to analyze computed tomography (CT) and magnetic resonance (MR) images and to evaluate the maximum standardized uptake value (SUV max) of positron emission tomography (PET)/CT parameters between sinonasal non-Hodgkin's lymphoma (NHL) and squamous cell carcinoma (SCC), knowing the imaging features that distinguish sinonasal NHL from SCC. Study Design Case series with chart review. Setting University tertiary care facility. Subjects and Methods We analyzed the features on CT, MR imaging, and PET/CT of 78 patients diagnosed with sinonasal NHL or SCC histopathologically...
April 1, 2018: Otolaryngology—Head and Neck Surgery
https://www.readbyqxmd.com/read/29660176/the-role-of-radiotherapy-as-salvage-and-or-consolidation-treatment-in-relapsed-refractory-and-high-risk-diffuse-large-b-cell-lymphoma
#15
Eric Grignano, Jérémy Laurent, Bénédicte Deau, Barbara Burroni, Didier Bouscary, Youlia M Kirova
OBJECTIVE: Many salvage therapies have been proposed for relapsed/refractory (R/R) diffuse large B-cell lymphomas or for consolidation in the case of suboptimal response. Radiotherapy (RT) is one modality of salvage therapy, but its place is currently not well defined. METHOD: This paper reports a retrospective review of patients receiving unplanned radiotherapy for R/R diffuse large B-cell lymphoma (DLBCL) or primary mediastinal B-cell lymphoma (PMBCL), or as consolidation therapy after second line chemotherapy, treated in our hospital...
April 16, 2018: European Journal of Haematology
https://www.readbyqxmd.com/read/29660033/phosphorylation-of-xeroderma-pigmentosum-group-c-regulates-ultraviolet-induced-dna-damage-repair
#16
Palak Shah, Baozhong Zhao, Lei Qiang, Yu-Ying He
Nucleotide excision repair (NER) is the most versatile DNA repair system that removes bulky DNA damage induced by various endogenous and exogenous factors, including UV radiation. Defects in NER can lead to the xeroderma pigmentosum (XP) syndrome, mainly characterized by increased carcinogenesis in the skin. The function of NER factors, including xeroderma pigmentosum group C (XPC), can be regulated by post-translational modifications such as ubiquitination. However, the role of phosphorylation in XPC function remains unknown...
April 6, 2018: Nucleic Acids Research
https://www.readbyqxmd.com/read/29657689/successful-management-of-abdominal-pregnancy-two-case-reports
#17
Shabnam Saquib, Wafa Elhussein Mohammed Talha
Abdominal pregnancy is a rare, life-threatening condition defined as pregnancy in the peritoneal cavity exclusive of tubal, ovarian, or intraligamentary locations. It can be primarily located in the peritoneal cavity or secondary to a ruptured ectopic pregnancy or tubal abortion. We present two cases of abdominal pregnancy, one primary and another secondary, both diagnosed and successfully managed in our institution. The first patient, a para 2 at 14 weeks gestation, presented with abdominal pain, distension, and dizziness, which had started four days prior...
March 2018: Oman Medical Journal
https://www.readbyqxmd.com/read/29653418/simple-and-label-free-pathogen-enrichment-via-homobifunctional-imidoesters-using-a-microfluidic-slim-system-for-ultrasensitive-pathogen-detection-in-various-clinical-specimens
#18
Choong Eun Jin, Bonhan Koo, Eun Yeong Lee, Ji Yeun Kim, Sung-Han Kim, Yong Shin
Diseases caused by pathogenic microorganisms including bacteria and viruses can cause serious medical issues including death and result in huge economic losses. Despite the myriad of recent advances in the rapid and accurate detection of pathogens, large volume clinical samples with a low concentration of pathogens continue to present challenges for diagnosis and surveillance. We here report a simple and label-free approach via homobifunctional imidoesters (HIs) with a microfluidic platform (SLIM) to efficiently enrich and extract pathogens at low concentrations from clinical samples...
April 3, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29652491/inhibition-of-voltage-gated-k-channel-kv1-5-by-anti-arrhythmic-drugs
#19
Rong Chen, Shin-Ho Chung
Molecular dynamics simulations are employed to determine the inhibitory mechanisms of three drugs, 5-(4- phenoxybutoxy)psoralen (PAP-1), vernakalant and flecainide, on the voltage-gated K+ channel Kv1.5, a target for the treatment of cardiac arrhythmia. At neutral pH, PAP-1 is neutral, whereas the other two molecules carry one positive charge. We show that PAP-1 forms stable dimers in water, primarily through the hydrophobic interactions between aromatic rings. All three molecules bind to the cavity between the Ile508 and Val512 residues from the four subunits of the channel...
April 13, 2018: Biochemistry
https://www.readbyqxmd.com/read/29649677/the-solvent-effects-on-dimethyl-phthalate-investigated-by-ftir-characterization-solvent-parameter-correlation-and-dft-computation
#20
Yi Chen, Hui Zhang, Wenzhao Zhou, Chao Deng, Jian Liao
This study set out with the aim of investigating the solvent effects on dimethyl phthalate (DMP) using FTIR characterization, solvent parameter correlation and DFT calculation. DMP exposed to 17 organic solvents manifested varying shift in the carbonyl stretching vibration frequency (νCO ). Non-alkanols induced Band I and alkanols produced Band I and Band II. Through correlating the νCO with the empirical solvent scales including acceptor parameter (AN), Schleyer's linear free energy parameter (G), and linear free salvation energy relationships (LSER), Band I was mainly ascribed to non-specific effects from either non-alkanols or alkanol polymers ((alkanol)n )...
April 3, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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