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https://www.readbyqxmd.com/read/28340299/bifurcation-of-regeneration-and-recombination-in-dye-sensitized-solar-cells-via-electronic-manipulation-of-tandem-cobalt-redox-shuttles
#1
Josh Baillargeon, Yuling Xie, Thomas W Hamann
A cobalt(IV/III) redox shuttle, cobalt tris(2-(p-tolyl)pyridine), [Co(ptpy)3]+/0, was synthesized and investigated for use in dye-sensitized solar cells, DSSCs. An incredibly fast self-exchange rate constant of (9.2  3.9) × 108 M-1s-1 was determined for [Co(ptpy)3]+/0, making it an ideal candidate for dye regeneration. To avoid fast recombination and solubility limitations, a tandem electrolyte containing [Co(ptpy)3]+/0 and cobalt tris(2,2'-bipyridine), [Co(bpy)3]3+/2+, was utilized. An improved short circuit current density is achieved for DSSCs employing the tandem electrolyte, compared to electrolytes containing only [Co(bpy)3]3+/2+, consistent with superior dye regeneration expected based on predictions using Marcus Theory, which is also discussed...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28338147/symmetry-breaking-during-nanocrystal-growth
#2
Kyle D Gilroy, Hsin-Chieh Peng, Xuan Yang, Aleksey Ruditskiy, Younan Xia
Symmetry breaking is a ubiquitous phenomenon that occurs spontaneously when a system is subjected to changes in size and/or variations in terms of thermodynamic parameters. As a stochastic process, even small fluctuations acting on a system can arbitrarily push it down one of the branches of a bifurcation. In this feature article, we use nanocrystal growth to illustrate the concept of symmetry breaking. Our aim is to convey its importance from a mechanistic perspective, by which one can rationally alter the experimental conditions to manipulate the growth pattern (symmetric vs...
March 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28336526/identification-of-unipotent-megakaryocyte-progenitors-in-human-hematopoiesis
#3
Kohta Miyawaki, Hiromi Iwasaki, Takashi Jiromaru, Hirotake Kusumoto, Ayano Yurino, Takeshi Sugio, Yasufumi Uehara, Jun Odawara, Shinya Daitoku, Yuya Kunisaki, Yasuo Mori, Yojiro Arinobu, Hirofumi Tsuzuki, Yoshikane Kikushige, Tadafumi Iino, Koji Kato, Katsuto Takenaka, Toshihiro Miyamoto, Takahiro Maeda, Koichi Akashi
The developmental pathway for human megakaryocytes remains unclear and the definition of pure unipotent megakaryocyte progenitor is still controversial. Using single-cell transcriptome analysis, we have identified a cluster of cells within immature hematopoietic stem and progenitor cell populations that specifically express genes related to the megakaryocyte lineage. We used CD41 as a positive marker to identify these cells within the CD34(+)CD38(+)IL-3Rα(dim)CD45RA(-) common myeloid progenitor (CMP) population...
March 23, 2017: Blood
https://www.readbyqxmd.com/read/28336393/contributions-of-%C3%AE-tubulin-to-cellular-morphology-sporulation-and-virulence-in-the-insect-fungal-pathogen-metarhizium-acridum
#4
Jie Zhang, Kai Jin, Yuxian Xia
β-tubulin is an elementary subunit of microtubules that form the cytoskeleton, participating in a wide range of cellular processes. The contributions of the single β-tubulin gene in affecting cell morphology, sporulation and virulence were examined in the entomopathogenic fungus Metarhizium acridum. Targeted gene knockout of β-tubulin resulted in resistance to benomyl but impaired proper nuclear segregation, lipid droplet transport, and deposition of chitin to the cell wall. M. acridum β-tubulin mutants displayed wavy hyphal growth and densely packed, wrinkled colonies...
March 20, 2017: Fungal Genetics and Biology: FG & B
https://www.readbyqxmd.com/read/28335164/results-of-in-situ-fenestration-by-contralateral-iliac-route-for-conversion-of-aorto-uni-iliac-stentgrafts-into-bifurcated-stentgrafts
#5
Raphaël Coscas, Isabelle Javerliat, Henri Lamas, Amélie Mlynski, Olivier Goeau-Brissonniere, Marc Coggia
No abstract text is available yet for this article.
January 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28333370/influence-of-nickel-titanium-rotary-systems-with-varying-tapers-on-the-biomechanical-behaviour-of-maxillary-first-premolars-under-occlusal-forces-a-finite-element-analysis-study
#6
S Askerbeyli Ors, A Serper
AIM: To evaluate the effect of three nickel-titanium (Ni-Ti) rotary systems with varying tapers on stress distribution and to analyse potential fracture patterns as well as the volume of fracture-susceptible regions in two-rooted maxillary premolars. METHODOLOGY: The root canals of three single-rooted premolars were prepared with either HeroShaper (Micro-Mega, Besançon, France) to (size 30, .04 taper), Revo-S (Micro-Mega) to AS30 (size 30, .06 taper) or ProTaper Universal (Dentsply Maillefer, Ballaigeus, Switzerland) to F3 (size 30, ...
March 23, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/28331569/an-unusual-diagnosis-for-persistent%C3%A2-diarrhoea-and-vomiting
#7
James Nott, Asad Khan, Ravi Madhotra, George MacFaul, Kamran Rostami
Identifying the etiology of chronic diarrhoea might be challenging in some patients, and before a diagnosis is made these patients may spend a substantial length of time with unresolved symptoms leading to uncertainty and anxiety that is severely impairing their life quality. A 45-year-old female was referred by her general practitioner with a 5-year history of increasingly frequent episodes of cyclical diarrhoea, vomiting, abdominal pain and intermittent palpitations. Contrast CT Abdomen/Pelvis revealed a 36x33x46 mm mass in the aorto caval region of her retro-peritoneum, just above the bifurcation...
2017: Gastroenterology and Hepatology From Bed to Bench
https://www.readbyqxmd.com/read/28331273/double-right-testicular-arteries-passing-through-the-hiatus-in-the-trifurcated-testicular-vein
#8
Qing-Hua Mao, Jing Li
Variations of the testicular artery have been commonly described by many authors, although reports for accessory or double testicular arteries were scarce. The testicular vein displays a great variability as regards their numbers, courses, and sites of termination. We present here a single right testicular vein dividing into three trunks at the terminal drainage, and the bifurcated right testicular artery passed through the hiatus of the testicular vein.
February 2017: Indian Journal of Surgery
https://www.readbyqxmd.com/read/28330344/short-time-dynamics-and-decay-mechanism-of-2-1h-pyridinone-upon-excitation-to-the-light-absorbing-s4-2-1
#9
Teng-Shuo Zhang, Jia-Dan Xue, Xuming Zheng, Bin-Bin Xie, Wei-Hai Fang
The excited-state structural dynamics and the decay mechanism of 2(1H)-pyridinone (NHP) after excitation to the S4(2(1)ππ(*)) light-absorbing state were studied using resonance Raman spectroscopy and complete-active space self-consistent field (CASSCF) calculations. The B-band absorption cross-section and the corresponding absolute resonance Raman cross-sections were simulated using a simple model based on time-dependent wave-packet theory. The geometric structures of the singlet electronic excited states and their curve-crossing points were optimized at the CASSCF level of theory...
March 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28327144/computational-medical-imaging-and-hemodynamics-framework-for-functional-analysis-and-assessment-of-cardiovascular-structures
#10
REVIEW
Kelvin K L Wong, Defeng Wang, Jacky K L Ko, Jagannath Mazumdar, Thu-Thao Le, Dhanjoo Ghista
Cardiac dysfunction constitutes common cardiovascular health issues in the society, and has been an investigation topic of strong focus by researchers in the medical imaging community. Diagnostic modalities based on echocardiography, magnetic resonance imaging, chest radiography and computed tomography are common techniques that provide cardiovascular structural information to diagnose heart defects. However, functional information of cardiovascular flow, which can in fact be used to support the diagnosis of many cardiovascular diseases with a myriad of hemodynamics performance indicators, remains unexplored to its full potential...
March 21, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28326733/-cone-beam-computed-tomography-evaluation-of-bifid-mandibular-canals-in-the-adult-population-in-sichuan-province
#11
Ye Li, Chen Yafei, Pei Jun, Liu Yuanyuan, Qi Shuqun, Pan Jian
OBJECTIVE: To investigate the incidence of bifid mandibular canals (BMC), and analyze the types, courses, and anatomic features of the variant canals in the adult population in Sichuan Province. METHODS: Five hundred patients (1 000 hemimandibles) underwent cone beam computed tomography (CBCT) were included in this study. The incidence, bifurcate types and courses of the BMC were evaluated. RESULTS: The incidence of BMC was 13.8% (69/500) in the study, 9...
February 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28325445/nonlinear-model-on-pulsatile-flow-of-blood-through-a-porous-bifurcated-arterial-stenosis-in-the-presence-of-magnetic-field-and-periodic-body-acceleration
#12
R Ponalagusamy, S Priyadharshini
BACKGROUND AND OBJECTIVE: Background and Objective: The motivation of cardiovascular modeling is to understand the haemodynamic and mechanical factors in the diagnosis and treatment of cardiovascular diseases. Several investigations have been carried out by many authors to understand the flow properties of blood in modelling blood flows in the circulatory system. In the present article, the pulsatile flow of Herschel-Bulkley fluid through a bifurcated arterial stenosis in a porous medium with magnetic field and periodic body acceleration has been investigated in view of understanding the role of rheological behaviour of blood, stenotic height, bifurcation angle, magnetic field and porosity of wall in the initiation and proliferation of cardiovascular diseases...
April 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28324943/overcoming-spatio-temporal-limitations-using-dynamically-scaled-in-vitro-pc-mri-a-flow-field-comparison-to-true-scale-computer-simulations-of-idealized-stented-and-patient-specific-left-main-bifurcations
#13
Susann Beier, John Ormiston, Mark Webster, John Cater, Stuart Norris, Pau Medrano-Gracia, Alistair Young, Kathleen Gilbert, Brett Cowan
The majority of patients with angina or heart failure have coronary artery disease. Left main bifurcations are particularly susceptible to pathological narrowing. Flow is a major factor of atheroma development, but limitations in imaging technology such as spatio-temporal resolution, signal-to-noise ratio (SNRv), and imaging artefacts prevent in vivo investigations. Computational fluid dynamics (CFD) modelling is a common numerical approach to study flow, but it requires a cautious and rigorous application for meaningful results...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324801/schwannoma-of-the-descending-loop-of-the-hypoglossal-nerve-case-report
#14
Giulio Illuminati, Giulia Pizzardi, Rocco Pasqua, Piergaspare Palumbo, Francesco Vietri
INTRODUCTION: Schwannomas of the descending loop of the hypoglossal nerve are very rare. They are slow-growing tumors that may masquerade a carotid body tumor. PRESENTATION OF CASE: A 60-year-old female was referred for a latero-cervical mass appearing as a chemodectoma at CT-scan. At operation, a 2cm mass arising from the descending loop of the hypoglossal nerve was resected en bloc with the loop itself and a functional lymphadenectomy was associated. Post-operative course was uneventful and the patient is free from disease recurrence at one year follow-up...
March 7, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28324759/stability-and-instability-of-a-neuron-network-with-excitatory-and-inhibitory-small-world-connections
#15
Dongyuan Yu, Xu Xu, Jing Zhou, Eric Li
This study considers a delayed neural network with excitatory and inhibitory shortcuts. The global stability of the trivial equilibrium is investigated based on Lyapunov's direct method and the delay-dependent criteria are obtained. It is shown that both the excitatory and inhibitory shortcuts decrease the stability interval, but a time delay can be employed as a global stabilizer. In addition, we analyze the bounds of the eigenvalues of the adjacent matrix using matrix perturbation theory and then obtain the generalized sufficient conditions for local stability...
March 2, 2017: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/28324758/dynamics-of-complex-valued-fractional-order-neural-networks
#16
Eva Kaslik, Ileana Rodica Rădulescu
The dynamics of complex-valued fractional-order neuronal networks are investigated, focusing on stability, instability and Hopf bifurcations. Sufficient conditions for the asymptotic stability and instability of a steady state of the network are derived, based on the complex system parameters and the fractional order of the system, considering simplified neuronal connectivity structures (hub and ring). In some specific cases, it is possible to identify the critical values of the fractional order for which Hopf bifurcations may occur...
March 6, 2017: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/28324235/neoascarophis-sinensis-n-sp-nematoda-cystidicolidae-a-parasite-of-conger-myriaster-brevoort-anguilliformes-congridae-in-chinese-waters
#17
Hui-Xia Chen, Lu-Ping Zhang, Xin Du, Liang Li
Neoascarophis sinensis n. sp. collected from the whitespotted conger Conger myriaster (Brevoort) (Anguilliformes: Congridae) in the Yellow and East China Seas, is described using both light and scanning electron microscopy. The new species is characterised mainly by the body size (8.5-10.5 mm in the males, 9.5-14.0 mm in the females), the location of the vulva (near equatorial region of the body), the non-bifurcate deirids, the lengths of the vestibule (40-50 µm in the males, 30-60 µm in the females) and glandular oesophagus (2...
March 21, 2017: Systematic Parasitology
https://www.readbyqxmd.com/read/28324141/early-hepatic-artery-thrombosis-after-liver-transplantation-what-is-the-impact-of-the-arterial-reconstruction-type
#18
Astrid Herrero, Regis Souche, Emmanuel Joly, Gildas Boisset, Hussein Habibeh, Hassan Bouyabrine, Fabrizio Panaro, Jose Ursic-Bedoya, Samir Jaber, Boris Guiu, Georges Philippe Pageaux, Francis Navarro
OBJECTIVE: Hepatic artery thrombosis (HAT) is the most severe vascular complication occurring after liver transplantation, with an incidence ranging from 2 to 9% in adults. Although the ideal arterial reconstruction is often described as a short and non-redundant anastomosis fashioned between the recipient and donor hepatic arteries, there is no strong evidence about this ideal reconstruction in the literature. The aim of this study was to assess the impact of the type of arterial reconstruction on early HAT after primary liver transplantation...
March 21, 2017: World Journal of Surgery
https://www.readbyqxmd.com/read/28323182/treatment-of-large-and-giant-middle-cerebral-artery-aneurysms-risk-factors-for-unfavorable-outcomes
#19
Wonhyoung Park, Jaewoo Chung, Jae Sung Ahn, Jung Cheol Park, Byung Duk Kwun
OBJECTIVE: This study aimed to assess the clinical and radiological outcomes after neurosurgical treatment of large and giant aneurysms of the middle cerebral artery (MCA). In addition, we aimed to identify risk factors for unfavorable outcomes. METHODS: This retrospective study included 105 patients with 106 large or giant MCA aneurysms treated with neurosurgical methods, including microsurgery and endovascular treatment, over a 15-year period. RESULTS: The mean aneurysm size was 15...
March 16, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28323157/anatomic-variations-of-inferior-mesenteric-artery-and-left-colic-artery-evaluated-by-3-dimensional-ct-angiography-insights-into-rectal-cancer-surgery
#20
Jia Ke, Jiawei Cai, Xiaofeng Wen, Xianrui Wu, Zhen He, Yifeng Zou, Jianping Qiu, Xiaowen He, Xiaosheng He, Lei Lian, Xiaojian Wu, Zhiyang Zhou, Ping Lan
OBJECTIVE: To demonstrate the clinical applicability of 3-dimensional CT angiography (3D-CTA) in evaluating the anatomic variations of inferior mesenteric artery (IMA) and left colic artery (LCA), to help make pre-operative strategies of rectal cancer surgery. METHODS: 188 patients with abdominal and pelvic contrast-enhanced CT scan were retrospectively enrolled and 3D-CTA was reconstructed. The origin and branching patterns of IMA, tracking patterns of LCA, intersectional patterns among IMA, LCA and inferior mesenteric vein (IMV) were examined, and their associations with clinical features were analyzed...
March 16, 2017: International Journal of Surgery
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