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https://www.readbyqxmd.com/read/28539296/-establishment-of-a-rabbit-model-of-small-diameter-vascular-graft-replacement
#1
Jia-Qing Zhang, Kun-Tang Chen, Fu-Wei Zhang, Shao-Bin Li, Yuan-Zhou Wu, Jing Feng, Wu-Jun Wang, Yu-Sheng Yan
OBJECTIVE: To establish an rabbit model that mimics the hemodynamics of the bypass graft after coronary artery bypass surgery. METHODS: Sixteen New Zealand rabbits were randomly divided into two groups for abdominal aortic artery replacement using a 3-cm-long ePTFE graft with an inner diameter 4 mm through an incision at 1/3 from the middle to the lower part of the abdomen (group A) or in the lower abdomen (group B). The general conditions of the rabbits, operative time, number of collateral vessels that needed to be ligated, rate of massive intraoperative bleeding, fluctuation of vascular anastomosis after surgery, patency rate of the graft on day 7 after the operation were compared between the two groups...
May 20, 2017: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/28505872/quantum-corrections-of-the-truncated-wigner-approximation-applied-to-an-exciton-transport-model
#2
Anton Ivanov, Heinz-Peter Breuer
We modify the path integral representation of exciton transport in open quantum systems such that an exact description of the quantum fluctuations around the classical evolution of the system is possible. As a consequence, the time evolution of the system observables is obtained by calculating the average of a stochastic difference equation which is weighted with a product of pseudoprobability density functions. From the exact equation of motion one can clearly identify the terms that are also present if we apply the truncated Wigner approximation...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28501974/proteolytic-activities-in-cortex-of-apical-parts-of-vicia-faba-ssp-minor-seedling-roots-during-kinetin-induced-programmed-cell-death
#3
Andrzej Kaźmierczak, Magdalena Doniak, Anita Kunikowska
Programmed cell death (PCD) is a crucial process in plant development. In this paper, proteolytically related aspects of kinetin-induced PCD in cortex cells of Vicia faba ssp. minor seedlings were examined using morphological, fluorometric, spectrophotometric, and fluorescence microscopic analyses. Cell viability estimation after 46 μM kinetin treatment of seedling roots showed that the number of dying cortex cells increased with treatment duration, reaching maximum after 72 h. Weight of the apical root segments increased with time and was about 2...
May 13, 2017: Protoplasma
https://www.readbyqxmd.com/read/28492016/vaginal-rejuvenation-using-energy-based-devices
#4
REVIEW
Cheryl Karcher, Neil Sadick
Physiologic changes in a woman's life, such as childbirth, weight fluctuations, and hormonal changes due to aging and menopause, may alter the laxity of the vaginal canal, damage the pelvic floor, and devitalize the mucosal tone of the vaginal wall. These events often lead to the development of genitourinary conditions such as stress urinary incontinence; vaginal atrophy; dryness; and physiologic distress affecting a woman's quality of life, self-confidence, and sexuality. Various treatment modalities are currently available to manage these indications, varying from invasive vaginal surgery to more benign treatments like topical vaginal hormonal gels or hormone-replacement therapy...
September 2016: International Journal of Women's Dermatology
https://www.readbyqxmd.com/read/28486426/a-low-glycaemic-index-diet-incorporating-isomaltulose-is-associated-with-lower-glycaemic-response-and-variability-and-promotes-fat-oxidation-in-asians
#5
Christiani Jeyakumar Henry, Bhupinder Kaur, Rina Yu Chin Quek, Stefan Gerardus Camps
Low glycaemic index (GI) foods minimize large blood glucose fluctuations and have been advocated to enhance fat oxidation and may contribute to weight management. We determined whether the inclusion of isomaltulose compared to sucrose in a low/high GI meal sequence can modulate the glycaemic response and substrate oxidation in an Asian population. Twenty Chinese men (body mass index (BMI): 17-28 kg/m²) followed a 24 h low GI (isomaltulose, Palatinose(TM)) or high GI (sucrose) diet in a randomized double-blind, controlled cross-over design...
May 9, 2017: Nutrients
https://www.readbyqxmd.com/read/28479103/linking-graph-features-of-anatomical-architecture-to-regional-brain-activity-a-multi-modal-mri-study
#6
Tien-Wen Lee, Shao-Wei Xue
BACKGROUND: Previous empirical research has treated regional neural responses and network architecture separately. However, anecdotal reports have suggested a close relationship between the two. This study aims to investigate the influence of structural connectivity on regional spontaneous activities. METHODS: Datasets of structural magnetic resonance imaging (sMRI), resting state functional MRI (rs-fMRI) and diffusion weighted imaging (DWI) of 36 right-handed healthy subjects (average age 27...
May 4, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28474929/discontinuous-transition-from-direct-to-inverse-cascade-in-three-dimensional-turbulence
#7
Ganapati Sahoo, Alexandros Alexakis, Luca Biferale
Inviscid invariants of flow equations are crucial in determining the direction of the turbulent energy cascade. In this work we investigate a variant of the three-dimensional Navier-Stokes equations that shares exactly the same ideal invariants (energy and helicity) and the same symmetries (under rotations, reflections, and scale transforms) as the original equations. It is demonstrated that the examined system displays a change in the direction of the energy cascade when varying the value of a free parameter which controls the relative weights of the triadic interactions between different helical Fourier modes...
April 21, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28467785/association-of-lower-body-mass-index-with-increased-glycemic-variability-in-patients-with-newly-diagnosed-type-2-diabetes-a-cross-sectional-study-in-china
#8
Jian Wang, Rengna Yan, Juan Wen, Xiaocen Kong, Huiqin Li, Peihua Zhou, Honghong Zhu, Xiaofei Su, Jianhua Ma
Previous studies have indicated that the pathogenesis of diabetes differs between obese and lean patients. We investigated whether newly diagnosed Chinese diabetic patients with different body mass indices (BMIs) have different glycemic variability, and we assessed the relationship between BMI and glycemic variability. This was a cross-sectional study that included 169 newly diagnosed and drug-naïve type 2 diabetic patients (mean age, 51.33 ± 9.83 years; 110 men). The clinical factors and results of the 75-g oral glucose tolerance test were all recorded...
April 14, 2017: Oncotarget
https://www.readbyqxmd.com/read/28457658/pilot-scale-production-of-poly-3-hydroxybutyrate-co-4-hydroxybutyrate-biopolymers-with-high-molecular-weight-and-elastomeric-properties
#9
Kai-Hee Huong, Mat Junoh Azuraini, Nursolehah Abdul Aziz, Al-Ashraf Abdullah Amirul
Poly(3-hydroxybutyrate-co-4-hydroxybutyrate) [(P(3HB-co-4HB)] copolymer receives attention as next generation biomaterial in medical application. However, the exploitation of the copolymer is still constrained since such copolymer has not yet successfully been performed in industrial scale production. In this work, we intended to establish pilot production system of the copolymer retaining the copolymer quality which has recently discovered to have novel characteristic from lab scale fermentation. An increase of agitation speed has significantly improved the copolymer accumulation efficiency by minimizing the utilization of substrates towards cell growth components...
April 27, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28456212/decisive-test-of-the-ideal-behavior-of-tetra-peg-gels
#10
Ferenc Horkay, Kengo Nishi, Mitsuhiro Shibayama
The objective of this work is to investigate the thermodynamic and scattering behavior of tetra-poly(ethylene glycol) (PEG) gels. Complementary measurements, including osmotic swelling pressure, elastic modulus, and small angle neutron scattering (SANS), are reported for a series of tetra-PEG gels made from different molecular weight precursor chains at different concentrations. Analysis of the osmotic swelling pressure vs polymer volume fraction curves makes it possible to separate the elastic and mixing contributions of the network free energy...
April 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28456172/structural-connectome-topology-relates-to-regional-bold-signal-dynamics-in-the-mouse-brain
#11
Sarab S Sethi, Valerio Zerbi, Nicole Wenderoth, Alex Fornito, Ben D Fulcher
Brain dynamics are thought to unfold on a network determined by the pattern of axonal connections linking pairs of neuronal elements; the so-called connectome. Prior work has indicated that structural brain connectivity constrains pairwise correlations of brain dynamics ("functional connectivity"), but it is not known whether inter-regional axonal connectivity is related to the intrinsic dynamics of individual brain areas. Here we investigate this relationship using a weighted, directed mesoscale mouse connectome from the Allen Mouse Brain Connectivity Atlas and resting state functional MRI (rs-fMRI) time-series data measured in 184 brain regions in eighteen anesthetized mice...
April 2017: Chaos
https://www.readbyqxmd.com/read/28451660/impact-and-consequences-of-polyphenols-and-fructooligosaccharide-interplay-on-gut-microbiota-in-rats
#12
Chuan-Jin Zheng, Rong Liu, Bin Xue, Jianming Luo, Lijuan Gao, Yong Wang, Shiyi Ou, Shugang Li, Xichun Peng
Both fructooligosaccharide (FOS) and polyphenols can be individually and directly transferred to the large intestine of mammals and are beneficial for human health as they reshape the composition of gut microbiota. The combination impact of FOS and polyphenols on rats' gut microbiota and the corresponding consequences on rats were investigated via MiSeq sequencing technique and bioinformatics. The results showed that the combination of different phenolic compounds and FOS displayed distinct impact on the host...
May 24, 2017: Food & Function
https://www.readbyqxmd.com/read/28448569/dynamics-and-complexity-of-body-temperature-in-preterm-infants-nursed-in-incubators
#13
Kerstin Jost, Isabelle Pramana, Edgar Delgado-Eckert, Nitin Kumar, Alexandre N Datta, Urs Frey, Sven M Schulzke
BACKGROUND: Poor control of body temperature is associated with mortality and major morbidity in preterm infants. We aimed to quantify its dynamics and complexity to evaluate whether indices from fluctuation analyses of temperature time series obtained within the first five days of life are associated with gestational age (GA) and body size at birth, and presence and severity of typical comorbidities of preterm birth. METHODS: We recorded 3h-time series of body temperature using a skin electrode in incubator-nursed preterm infants...
2017: PloS One
https://www.readbyqxmd.com/read/28448406/two-dimensional-spoiled-gradient-recalled-echo-magnetic-resonance-imaging-of-the-liver-using-respiratory-navigator-gating-techniques
#14
Yusuke Inoue, Hirofumi Hata, Keiji Matsunaga, Ai Nakajima, Shotaro Komi, Yutaka Abe, Hiroki Miyatake
OBJECTIVE: We assessed the feasibility of T1-weighted 2-dimensional spoiled gradient-recalled (2D SPGR) acquisition in steady-state imaging of the liver with various respiratory navigator gating techniques. METHODS: A total of 12 healthy volunteers underwent in-phase and out-of-phase 2D SPGR imaging of the liver during breath-holding and free-breathing. Four techniques for respiratory navigation, 2 conventional navigator techniques and 2 self-navigator techniques, were used for free-breathing imaging...
April 26, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28447220/track-weighted-dynamic-functional-connectivity-tw-dfc-a-new-method-to-study-time-resolved-functional-connectivity
#15
Fernando Calamante, Robert E Smith, Xiaoyun Liang, Andrew Zalesky, Alan Connelly
Interest in the study of brain connectivity is growing, particularly in understanding the dynamics of the structural/functional connectivity relation. Structural and functional connectivity are most often analysed independently of each other. Track-weighted functional connectivity (TW-FC) was recently proposed as a means to combine structural/functional connectivity information into a single image. We extend here TW-FC in two important ways: first, all the functional data are used without having to define a prior functional network (cf...
April 26, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28442789/elastic-turbulence-in-entangled-semi-dilute-dna-solutions-measured-with-optical-coherence-tomography-velocimetry
#16
A V Malm, T A Waigh
The flow instabilities of solutions of high molecular weight DNA in the entangled semi-dilute concentration regime were investigated using optical coherence tomography velocimetry, a technique that provides high spatial (probe volumes of 3.4 pL) and temporal resolution (sub μs) information on the flow behaviour of complex fluids in a rheometer. The velocity profiles of the opaque DNA solutions (high and low salt) were measured as a function of the distance across the gap of a parallel plate rheometer, and their evolution over time was measured...
April 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28441445/impact-of-aberrant-cerebral-perfusion-on-resting-state-functional-mri-a-preliminary-investigation-of-moyamoya-disease
#17
Yituo Wang, Lubin Wang, Penggang Qiao, Fugeng Sheng, Cong Han, Enmao Ye, Yu Lei, Feng Yan, Shanshan Chen, Yuyang Zhu, Guiyun Mi, Gongjie Li, Zheng Yang
The impact of chronic cerebral hypoperfusion on resting-state blood oxygen level-dependent signal fluctuations remains unknown. We aimed to determine whether chronic ischemia induces changes in amplitude of low-frequency fluctuations (ALFF) and to investigate the correlation between ALFF and perfusion-weighted magnetic resonance imaging (PWI) parameters in patients with moyamoya disease (MMD). Thirty patients with pre- and postoperative resting-state functional magnetic resonance imaging and PWI were included, and thirty normal controls underwent resting-state functional magnetic resonance imaging...
2017: PloS One
https://www.readbyqxmd.com/read/28439014/brain-networks-for-confidence-weighting-and-hierarchical-inference-during-probabilistic-learning
#18
Florent Meyniel, Stanislas Dehaene
Learning is difficult when the world fluctuates randomly and ceaselessly. Classical learning algorithms, such as the delta rule with constant learning rate, are not optimal. Mathematically, the optimal learning rule requires weighting prior knowledge and incoming evidence according to their respective reliabilities. This "confidence weighting" implies the maintenance of an accurate estimate of the reliability of what has been learned. Here, using fMRI and an ideal-observer analysis, we demonstrate that the brain's learning algorithm relies on confidence weighting...
May 9, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28430489/absence-of-a-large-superconductivity-induced-gap-in-magnetic-fluctuations-of-sr_-2-ruo_-4
#19
S Kunkemöller, P Steffens, P Link, Y Sidis, Z Q Mao, Y Maeno, M Braden
Inelastic neutron scattering experiments on Sr_{2}RuO_{4} determine the spectral weight of the nesting induced magnetic fluctuations across the superconducting transition. There is no observable change at the superconducting transition down to an energy of ∼0.35  meV, which is well below the 2Δ values reported in several tunneling experiments. At this and higher energies magnetic fluctuations clearly persist in the superconducting state. Only at energies below ∼0.3  meV can evidence for partial suppression of spectral weight in the superconducting state be observed...
April 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28429353/roles-of-the-nrf2-ho-1-pathway-in-the-anti-oxidative-stress-response-to-ischemia-reperfusion-brain-injury-in-rats
#20
L-J Jiang, S-M Zhang, C-W Li, J-Y Tang, F-Y Che, Y-C Lu
OBJECTIVE: The aim of this study was to investigate the roles of the Nrf2/HO-1 pathway in the responses to the oxidative stress created by ischemia-reperfusion brain injury in rats. MATERIALS AND METHODS: 54 healthy, adult, male SD rats were included in the study. Eighteen (18) rats were placed in the sham group. The ischemia-reperfusion model was created in the other 36 rats, among which 18 received injections of Nrf2 agonist before the surgery. The suture method was used to create artery occlusions in the right brain of the rats; and reperfusion was done after 90-minute ischemia (MCAO); while no suture was inserted in the sham group...
April 2017: European Review for Medical and Pharmacological Sciences
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