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https://www.readbyqxmd.com/read/29350226/the-ortho-benzyne-cation-is-not-planar
#1
D Kaiser, E Reusch, P Hemberger, A Bodi, E Welz, B Engels, I Fischer
A recent review on the photoionisation of the C6H4 isomer ortho-benzyne suggests that bands reported in earlier photoelectron spectra might be due to side products or contaminations, while computations raise doubts, whether the cation has a planar geometry. We therefore reinvestigate the photoionisation of ortho-benzyne, generated by pyrolysis from benzocyclobutenedione, by photoion mass-selected threshold photoelectron (ms-TPE) spectroscopy using synchrotron radiation. The experiments are accompanied by a theoretical study that investigates the structure of the ortho-benzyne cation systematically as a function of the computational method, up to CASPT2(11,14) ab initio computations...
January 19, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29345434/two-photon-excited-silica-and-organosilica-nanoparticles-for-spatiotemporal-cancer-treatment
#2
REVIEW
Jonas G Croissant, Jeffrey I Zink, Laurence Raehm, Jean-Olivier Durand
Coherent two-photon-excited (TPE) therapy in the near-infrared (NIR) provides safer cancer treatments than current therapies lacking spatial and temporal selectivities because it is characterized by a 3D spatial resolution of 1 µm3 and very low scattering. In this review, the principle of TPE and its significance in combination with organosilica nanoparticles (NPs) are introduced and then studies involving the design of pioneering TPE-NIR organosilica nanomaterials are discussed for bioimaging, drug delivery, and photodynamic therapy...
January 18, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29339700/assessment-of-the-relationship-between-reperfusion-success-and-t-peak-to-t-end-interval-in-patients-with-st-elevation-myocardial-infarction-treated-with-percutaneous-coronary-intervention
#3
Metin Çağdaş, Süleyman Karakoyun, İbrahim Rencüzoğulları, Yavuz Karabağ, Mahmut Yesin, Yalçın Velibey, İnanç Artaç, Doğan İliş, Süleyman Çağan Efe, Onur Taşar, Halil İbrahim Tanboğa
OBJECTIVE: T-peak-T-end (TPE) interval, which represents the dispersion of repolarization, is defined as the interval between the peak and end of the T-wave, and is associated with increased malignant ventricular arrhythmia and sudden cardiac death (SCD) in patients with ST elevation myocardial infarction (STEMI). Although prolonged TPE interval is associated with poor short- and long-term outcomes, even in patients with STEMI treated with successful primary percutaneous coronary intervention (pPCI), clinical, angiographic, and laboratory parameters that affect TPE remain to be elucidated...
January 2018: Anatolian Journal of Cardiology
https://www.readbyqxmd.com/read/29337530/label-free-and-ultrasensitive-biomolecule-detection-based-on-aggregation-induced-emission-fluorogen-via-target-triggered-hemin-g-quadruplex-catalyzed-oxidation-reaction
#4
Haiyin Li, Jiafu Chang, Panpan Gai, Feng Li
Fluorescence biosensing strategy has drawn substantial attention due to their advantages of simplicity, convenience, sensitivity and selectivity, but unsatisfactory structure stability, low fluorescence quantum yield, high cost of labeling, and strict reaction conditions associated with current fluorescence methods severely prohibit their potential application. To address these challenges, we herein propose an ultrasensitive label-free fluorescence biosensor by integrating hemin/G-quadruplex-catalyzed oxidation reaction with aggregation induced emission (AIE) fluorogen-based system...
January 16, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29334938/therapeutic-plasma-exchange-in-a-tertiary-care-center-185-patients-undergoing-912-treatments-a-one-year-retrospective-analysis
#5
Julius J Schmidt, Firas Asper, Gunilla Einecke, Gabriele Eden, Carsten Hafer, Jan T Kielstein
BACKGROUND: Therapeutic plasma exchange (TPE) is increasingly used throughout the world. Although the procedure itself is fairly standardized, it is yet unknown how the underlying disease entities influence the key coordinates of the treatment. METHODS: Retrospective chart review. The treatment indications were clustered into four categories. Data are presented as median and interquartile (25-75%) range [IQR]. RESULTS: Within 1 year, 912 TPE treatments were performed in 185 patients (90 female, 48...
January 15, 2018: BMC Nephrology
https://www.readbyqxmd.com/read/29334460/multiple-stimuli-responses-of-stereo-isomers-of-aie-active-ethynylene-bridged-and-pyridyl-modified-tetraphenylethene
#6
Zhaoyang Wang, Xiao Cheng, Anjun Qin, Haoke Zhang, Jing Zhi Sun, Ben Zhong Tang
Luminescent molecules with aggregation-induced emission (AIE) property, or AIE-gens are typical stimuli-responsive materials and many AIE-gens have shown luminescent responses to mechano-, thermo-, electro-, vapo- and/or solvato-stimulus, but the detailed structure-property relationship has been addressed for only few of them. Here, we report a tetraphenylethene (TPE) derivative with pyridyl modifiers and ethynylene bridges. The (Z)- and (E)-isomers are clearly purified and both of them are AIE-active and demonstrate multiple luminescent responses to external stimuli...
January 15, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29334084/a-cyanine-based-fluorescent-cassette-with-aggregation-induced-emission-for-sensitive-detection-of-ph-changes-in-live-cells
#7
Mingxi Fang, Shuai Xia, Jianheng Bi, Travis P Wigstrom, Loredana Valenzano, Jianbo Wang, Wafa Mazi, Marina Tanasova, Fen-Tair Luo, Haiying Liu
An aggregation-induced emission (AIE) cyanine-based fluorescent cassette with a large pseudo-Stokes shift was designed and prepared to sensitively image pH changes in live cells via through-bond energy transfer (TBET) from a tetraphenylethene (TPE) donor to a cyanine acceptor.
January 15, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29331429/paper-based-fluorescent-sensor-via-aggregation-induced-emission-fluorogen-for-facile-and-sensitive-visual-detection-of-hydrogen-peroxide-and-glucose
#8
Jiafu Chang, Haiyin Li, Ting Hou, Wenna Duan, Feng Li
Hydrogen peroxide (H2O2), an important reactive oxygen species (ROS), is related to the oxidative stress in organisms, and plays important roles in a variety of cellular activities as well. So it is of crucial importance to develop sensitive and accurate sensing strategies to detect H2O2 in biological systems. Herein, by taking advantage of the unique emission characteristics of aggregation induced emission (AIE) fluorogens, we proposed a non-enzymatic fluorescence platform for facile and sensitive detection of H2O2, both in solution state using fluorescence spectrometer and on paper-based sensor via visual inspection...
January 6, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29331130/femtosecond-coherent-nuclear-dynamics-of-excited-tetraphenylethylene-ultrafast-transient-absorption-and-ultrafast-raman-loss-spectroscopic-studies
#9
Surajit Kayal, Khokan Roy, Siva Umapathy
Ultrafast torsional dynamics plays an important role in the photoinduced excited state dynamics. Tetraphenylethylene (TPE), a model system for the molecular motor, executes interesting torsional dynamics upon photoexcitation. The photoreaction of TPE involves ultrafast internal conversion via a nearly planar intermediate state (relaxed state) that further leads to a twisted zwitterionic state. Here, we report the photoinduced structural dynamics of excited TPE during the course of photoisomerization in the condensed phase by ultrafast Raman loss (URLS) and femtosecond transient absorption (TA) spectroscopy...
January 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29325204/a-transformable-chimeric-peptide-for-cell-encapsulation-to-overcome-multidrug-resistance
#10
Chi Zhang, Li-Han Liu, Wen-Xiu Qiu, Yao-Hui Zhang, Wen Song, Lu Zhang, Shi-Bo Wang, Xian-Zheng Zhang
Multidrug resistance (MDR) remains one of the biggest obstacles in chemotherapy of tumor mainly due to P-glycoprotein (P-gp)-mediated drug efflux. Here, a transformable chimeric peptide is designed to target and self-assemble on cell membrane for encapsulating cells and overcoming tumor MDR. This chimeric peptide (C16 -K(TPE)-GGGH-GFLGK-PEG8 , denoted as CTGP) with cathepsin B-responsive and cell membrane-targeting abilities can self-assemble into nanomicelles and further encapsulate the therapeutic agent doxorubicin (termed as CTGP@DOX)...
January 11, 2018: Small
https://www.readbyqxmd.com/read/29324082/sensory-dissociation-in-chronic-low-back-pain-two-case-reports
#11
Wacław M Adamczyk, Kerstin Luedtke, Oskar Saulicz, Edward Saulicz
Patients with chronic low back pain often report that they do not perceive their painful back accurately. Previous studies confirmed that sensory dissociation and/or discrepancy between perceived body image and actual size is one of the specific traits of patients with chronic pain. Current approaches for measuring sensory dissociation are limited to two-point-discrimination or rely on pain drawings not allowing for quantitative analysis. This case study reports the sensory dissociation of two cases with chronic low back pain using a recently published test (point-to-point-test (PTP)) and a newly developed test (two-point-estimation (TPE))...
January 11, 2018: Physiotherapy Theory and Practice
https://www.readbyqxmd.com/read/29323362/a-ph-responsive-aie-probe-for-enzyme-assays
#12
Leilei Shi, Yufeng Liu, Qian Wang, Tiankuo Wang, Yubin Ding, Yi Cao, Zhe Li, Hui Wei
By combining leucine (Leu) and tetraphenylethene (TPE), a pH-sensitive aggregation induced emission (AIE) probe TPE-Leu was developed. The aliphatic amine in TPE-Leu was more easily protonated under acidic conditions, which made TPE-Leu more water soluble. Therefore, the protonated AIE probe showed weak fluorescence under acidic conditions. When the pH was changed to basic conditions, it showed strong fluorescence due to the hydrophobic nature of TPE-Leu. We demonstrated that the probe showed high selectivity toward pH changes with the coexistence of other potential species such as metal ions, redox agents, and biomolecules...
January 11, 2018: Analyst
https://www.readbyqxmd.com/read/29318231/conformation-controlled-emission-of-aie-luminogen-a-tetraphenylethene-embedded-pillar-5-arene-skeleton
#13
Bin Han, Linpeng Zhu, Xi Wang, Ming Bai, Jianzhuang Jiang
An unprecedented meso-decorated pillar[5]arene derivative, EtP5A-DPE, embedded with a TPE unit was prepared and structurally characterized. In the crystal, the incubation of the guest 1,4-dicyanobutane molecule inside the tetraphenylethene-embedded pillar scaffold induces a significant change in the molecular conformation, shutting down the AIE emission of this compound.
January 10, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29316270/robot-guided-stereoelectroencephalography-without-a-computed-tomography-scan-for-referencing-analysis-of-accuracy
#14
Andrea Spyrantis, Adriano Cattani, Adam Strzelczyk, Felix Rosenow, Volker Seifert, Thomas M Freiman
OBJECTIVE: Recent studies with robot-guided stereotaxy use computed tomography (CT) scans for referencing. We will provide evidence that using preoperative MRI datasets referenced with a laser scan of the patient's face is sufficient for sEEG implantation. METHODS: In total, 40 sEEG electrodes were implanted in five patients by the robotic surgical assistant (ROSA). The postoperative CT scan for identifying electrode positions was fused with the preoperative MRI-based planning data...
January 8, 2018: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/29310792/nonlinear-optical-imaging-of-extracellular-matrix-proteins
#15
Chien-Cheng Shih, Dennis M Oakley, Matthew S Joens, Robyn A Roth, James A J Fitzpatrick
Over the last 2 decades, nonlinear imaging methods such as multiharmonic imaging microscopy (MHIM) have become powerful approaches for the label-free visualization of biological structures. Multiharmonic signals are generated when an intense electromagnetic field propagates through a sample that either has a specific molecular orientation or exhibits certain physical properties. It can provide complementary morphological information when integrated with other nonlinear optical imaging techniques such as two-photon excitation (TPE)...
2018: Methods in Cell Biology
https://www.readbyqxmd.com/read/29303592/evidence-for-aggregation-induced-emission-from-free-rotation-restriction-of-double-bond-at-excited-state
#16
Jia-Bin Xiong, Ying-Xue Yuan, Lian Wang, Jian-Ping Sun, Wei-Guo Qiao, Hong-Chao Zhang, Miao Duan, Hongwei Wang, Song Zhang, Yan-Song Zheng
This paper reports that cis-TPE dicycles emit strong fluorescence, while the gem dicycles show almost no emission in solution, demonstrating that the free rotation restriction of the double bond at the excited state is the key factor for AIE effects.
January 5, 2018: Organic Letters
https://www.readbyqxmd.com/read/29301371/the-sodium-glucose-cotransporter-2-inhibitor-dapagliflozin-prevents-renal-and-liver-disease-in-western-diet-induced-obesity-mice
#17
Dong Wang, Yuhuan Luo, Xiaoxin Wang, David J Orlicky, Komuraiah Myakala, Pengyuan Yang, Moshe Levi
Obesity and obesity related kidney and liver disease have become more prevalent over the past few decades, especially in the western world. Sodium-glucose cotransporter 2 (SGLT2) inhibitors are a new class of antidiabetic agents with promising effects on cardiovascular and renal function. Given SGLT2 inhibitors exert both anti-diabetic and anti-obesity effects by promoting urinary excretion of glucose and subsequent caloric loss, we investigated the effect of the highly selective renal SGLT2 inhibitor dapagliflozin in mice with Western diet (WD) induced obesity...
January 3, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29297451/cxcr3-ligands-in-pleural-fluid-as-markers-for-the-diagnosis-of-tuberculous-pleural-effusion
#18
W Chung, Y Jung, K Lee, J Park, S Sheen, K Park
SETTING: A tertiary care academic medical centre. OBJECTIVE: To evaluate the clinical usefulness of C-X-C motif chemokine receptor 3 (CXCR3) ligands in tuberculous pleural effusion (TPE). DESIGN: We recruited 336 patients with pleural effusion due to various causes. Concentrations of interferon-gamma (IFN-γ) and the CXCR3 ligands CXCL9 and CXCL11 were determined using enzyme immunoassays; adenosine deaminase (ADA) activity was measured in pleural fluid and serum...
December 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/29250791/successful-management-of-severe-red-blood-cell-alloimmunization-in-pregnancy-with-a-combination-of-therapeutic-plasma-exchange-intravenous-immune-globulin-and-intrauterine-transfusion
#19
Laura C Nwogu, Kenneth J Moise, Kimberly L Klein, Hlaing Tint, Brian Castillo, Yu Bai
BACKGROUND: Antibodies to Rhesus and Kell antigens have been associated with severe hemolytic disease of the fetus and newborn (HDFN) necessitating intrauterine transfusion (IUT) of red blood cells (RBCs). We report a case series of five women with severe HDFN secondary to maternal RBC alloimmunization who were successfully managed with therapeutic plasma exchange (TPE), intravenous immune globulin (IVIG), and IUT. STUDY DESIGN AND METHODS: This is a retrospective case series of five women with severe HDFN who underwent a total of three TPE procedures during Weeks 10 to 13 of pregnancy, followed by weekly IVIG infusions...
December 17, 2017: Transfusion
https://www.readbyqxmd.com/read/29250516/use-of-therapeutic-plasma-exchange-during-extracorporeal-life-support-in-critically-ill-cardiac-children-with-thrombocytopenia-associated-multi-organ-failure
#20
Mei Chong, Alejandro J Lopez-Magallon, Lucas Saenz, Mahesh S Sharma, Andrew D Althouse, Victor O Morell, Ricardo Munoz
Background: Thrombocytopenia-associated multi-organ failure (TAMOF) in children is a well-described factor for increased hospital mortality. Low cardiac output syndrome (LCOS) and the effects of cardiopulmonary bypass may manifest with several adverse physiologic and immunologic effects, with varying degrees of thrombocytopenia and multi-organ dysfunction, sometimes very similar to TAMOF. LCOS is a common occurrence in children with critical heart disease, presenting in as much as 23...
2017: Frontiers in Pediatrics
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