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https://www.readbyqxmd.com/read/29241096/study-of-non-covalent-interactions-on-dendriplex-formation-influence-of-hydrophobic-electrostatic-and-hydrogen-bonds-interactions
#1
María Sánchez-Milla, Isabel Pastor, Marek Maly, M Jesús Serramía, Rafael Gómez, Javier Sánchez-Nieves, Félix Ritort, M Ángeles Muñoz-Fernández, F Javier de la Mata
The interaction of a double stranded small interference RNA (siRNA Nef) with cationic carbosilane dendrimers of generations 1-3 with two different ammonium functions at the periphery ([-NMe2R]+, R=Me, (CH2)2OH) has been studied by experimental techniques (zeta potential, electrophoresis, single molecule pulling experiments) and molecular dynamic calculations. These studies state the presence of different forces on dendriplex formation, depending on generation and type of ammonium group. Whilst for higher dendrimers electrostatic forces mainly drive the stability of dendriplexes, first generation compounds can penetrate into siRNA strands due to the establishment of hydrophobic interactions...
December 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29240972/evidence-for-dynamic-chemical-kinetics-at-individual-ruthenium-catalysts
#2
Quinn T Easter, Suzanne A Blum
Catalytic cycles are typically depicted as possessing time-invariant steps with fixed rates. Yet the true behavior of individual catalysts with respect to time is unknown, hidden by the ensemble averaging inherent to bulk measurements. Herein, focused on a ring-opening metathesis polymerization reaction catalyzed by the second-generation Grubbs' ruthenium catalyst, we show evidence for variable chemical kinetics at individual catalysts with fluorescence microscopy possessing sufficient sensitivity for the detection of single chemical reactions...
December 14, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29240541/surveillance-or-metastasis-directed-therapy-for-oligometastatic-prostate-cancer-recurrence-a-prospective-randomized-multicenter-phase-ii-trial
#3
Piet Ost, Dries Reynders, Karel Decaestecker, Valérie Fonteyne, Nicolaas Lumen, Aurélie De Bruycker, Bieke Lambert, Louke Delrue, Renée Bultijnck, Tom Claeys, Els Goetghebeur, Geert Villeirs, Kathia De Man, Filip Ameye, Ignace Billiet, Steven Joniau, Friedl Vanhaverbeke, Gert De Meerleer
Purpose Retrospective studies suggest that metastasis-directed therapy (MDT) for oligorecurrent prostate cancer (PCa) improves progression-free survival. We aimed to assess the benefit of MDT in a randomized phase II trial. Patients and Methods In this multicenter, randomized, phase II study, patients with asymptomatic PCa were eligible if they had had a biochemical recurrence after primary PCa treatment with curative intent, three or fewer extracranial metastatic lesions on choline positron emission tomography-computed tomography, and serum testosterone levels > 50 ng/mL...
December 14, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/29240270/the-dynamic-equilibrium-of-hexakis-pentafluoroethyl-distannane-adducts-xsn-c2f5-3-sn-c2f5-3-x-cl-br-i-sn-c2f5-3
#4
Markus Wiesemann, Johannes Klösener, Beate Neumann, Hans-Georg Stammler, Berthold Hoge
The tin-tin bond cleavage of hexaorganodistannanes by nucleophiles is a long known reaction and widely used for stannate formation or stannyl group transfer. Herein we detail our experiments to provide analytical evidence for the existence of reasonably stable anionic complexes [XSn(C2F5)3{Sn(C2F5)3}]- (X = Cl, Br, I, Sn(C2F5)3) derived from hexakis(pentafluoroethyl)distannane. NMR investigations at low temperature lend further mechanistic insights. Thus, by detection of the imposing anion [Sn(C2F5)3{Sn(C2F5)3}2]-, one can surmise that the chemistry of Sn2(C2F5)6 has more in common with the isolobal iodine than with classical distannanes...
December 14, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29240121/dynamic-modulation-of-wideband-slow-light-with-continuous-group-index-in-polymer-filled-photonic-crystal-waveguide
#5
Chongqing Yan, Changhong Li, Yong Wan
The dynamic modulation of wide bandwidth and low-dispersion slow light with continuous variation of group index ng is realized in a polymer-filled photonic crystal waveguide (PF-PCW) with optimal structure. By adjusting the unified radius of air holes under a different refractive index of polymer in the first two rows of holes adjacent to the defect, the structure optimization of PF-PCW is first studied, then the fixed optimal structure is obtained. In the optimal photonic crystal waveguide with hole radius r0=0...
December 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29239996/upper-body-strength-measures-and-pop-up-performance-of-stronger-and-weaker-surfers
#6
Joanna Parsonage, Josh L Secomb, Jeremy M Sheppard, Brendon K Ferrier, Rebecca A Dowse, Sophia Nimphius
The primary purpose of this study was to investigate the reliability of the isometric push-up (IPU), dynamic push-up (DPU), and force plate pop-up (FP POP) as measures of upper-body isometric and dynamic strength qualities in surfing athletes. Furthermore, the study aimed to compare pop-up performance between stronger and weaker surfers. Eighteen female (n=9) and male (n=9) surfers (age=28.1±6.4 yrs, mass=69.6±10.4 kg, height=172.5±6.7 cm) completed a battery of upper-body strength assessments, of which exhibited high between-day reliability: (IPU, (CV%=4...
December 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29239806/development-of-postural-control-and-maturation-of-sensory-systems-in-children-of-different-ages-a-cross-sectional-study
#7
Cristina Dos Santos Cardoso de Sá, Catarina Costa Boffino, Renato Teodoro Ramos, Clarice Tanaka
OBJECTIVE: To evaluate the stability, postural adjustments and contributions of sensory information for postural control in children. METHODS: 40 boys and 40 girls were equally divided into groups of 5, 7, 9 and 12 years (G5, G7, G9 and G12). All children were submitted to dynamic posturography using a modified sensory organization test, using four sensory conditions: combining stable or sway referencing platform with eyes opened, or closed. The area and displacements of the center of pressure were used to determine stability, while the adjustments were used to measure the speed of the center of pressure displacements...
November 8, 2017: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/29239747/functional-testing-on-engineered-cartilage-to-identify-the-role-played-by-shearing
#8
Ling Wang, Hao Shen, Jichang Nie, Dichen Li, Hongbin Fan, Zhongmin Jin, Chaozong Liu
Compressive loading is crucial for tissue regeneration in cartilage; however, the role played by shearing induced from translational or rotational motion of the knee joint has yet to be identified. This study aims at investigating the effects of in vivo like dynamic load-compression integrated with shearing on tissue regeneration, particularly to identify the role played by shearing induced from rotational motion. Tissue samples fabricated from a calcium alginate hydrogel embedded with chondrocytes were subjected to a dynamic tissue culture...
November 24, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/29239712/multiparametric-mr-imaging-of-age-related-changes-in-healthy-thigh-muscles
#9
Min A Yoon, Suk-Joo Hong, Min Cheol Ku, Chang Ho Kang, Kyung-Sik Ahn, Baek Hyun Kim
Purpose To use multiparametric magnetic resonance (MR) imaging to assess for and establish age-related differences in healthy thigh muscles. Materials and Methods Ninety-five subjects (47 men, 48 women; median age, 47 years) with healthy body mass index were grouped according to age: 30-39 years (n = 25), 40-49 years (n = 25), 50-59 years (n = 25), and 60-69 years (n = 20). Multiparametric MR imaging (intravoxel incoherent motion diffusion-weighted, diffusion-tensor, multiecho Dixon, and dynamic contrast material-enhanced MR imaging) was performed at 3...
December 14, 2017: Radiology
https://www.readbyqxmd.com/read/29239694/a-novel-prenyl-polybasic-domain-code-determines-lipid-binding-specificity-of-the-k-ras-membrane-anchor
#10
Yong Zhou, John F Hancock
Ras proteins must localize to the plasma membrane (PM) for biological function. The membrane anchor of the K-Ras4B isoform comprises a farnesylated and methylated C-terminal cysteine together with an adjacent hexa-lysine polybasic domain (PBD). Traditionally, polybasic sequences have been thought to interact electrostatically with negatively charged membranes showing no specificity for anionic lipid head groups. By contrast we recently showed that the K-Ras membrane anchor actually exhibits a very high degree of specificity for phosphatidylserine (PtdSer)...
December 14, 2017: Small GTPases
https://www.readbyqxmd.com/read/29239610/nano-sensing-of-pesticides-by-zinc-oxide-quantum-dot-an-optical-and-electrochemical-approach-for-the-detection-of-pesticides-in-water
#11
Dibakar Sahoo, Abhishek Mandal, Tapas Mitra, Kaushik Chakraborty, Munmun Bardhan, Anjan Kumar Dasgupta
Present study reveals the low concentrations (~ 4 ppm) of pesticide sensing vis-à-vis degradation of pesticides with the help of nontoxic zinc oxide quantum dots (QD). In our study, we have taken 4 different pesticides v.i.z., Aldrin, Tetradifon, Glyphosate, and Atrazine, which are widely used in agriculture and have structural dissimilarities/diversity. By using optical sensing techniques such as steady state and time resolved fluorescence we have analysed the detailed exciton dynamics of QD in the presence of different pesticides...
December 14, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29239303/ultrafast-dynamics-of-differently-aligned-cooh-dte-bodipy-conjugates-linked-to-the-surface-of-tio-sub-2-sub
#12
Felix Schweighöfer, Imanuel Yuece, Lars Dworak, Peng Guo, Marc Zastrow, Kerstin Mayer, Christoph Barta, Diana Liebmann, Nandor Ziebart, Karola Rueck-Braun, Josef Wachtveitl
The photoinduced dynamics of two DTE-BODIPY conjugates A, B with carboxylic acid anchoring groups coupled to the surface of TiO2 were studied by ultrafast transient absorption spectroscopy. For compound A, with an orthogonal orientation of the BODIPY chromophore and the photoswitchable DTE unit, a charge separated state could not be reliably detected. Nevertheless, besides the energy transfer from the BODIPY to the closed DTE, indications for an electron transfer reaction were found by analyzing fluorescence quenching on TiO2 in steady state fluorescence measurements...
December 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29239047/does-the-amount-of-lower-extremity-movement-variability-differ-between-injured-and-uninjured-populations-a-systematic-review
#13
REVIEW
Samuel R Baida, Shane J Gore, Andrew D Franklyn-Miller, Kieran A Moran
Movement variability during repetitive performance of a dynamic activity (e.g. running, jumping, kicking) is considered an integral characteristic of optimal movement execution, however, it's relationship with musculoskeletal injury is not known. The primary aim of this paper was to review published comparison trials to determine if movement variability differs between uninjured controls and subjects with a lower limb musculoskeletal injury. A systematic search of online databases; Medline, Sports Discus, Scopus and Web of Science was conducted from July to November 2016...
December 14, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29238867/a-direct-comparison-of-contrast-enhanced-ultrasound-and-dynamic-contrast-enhanced-magnetic-resonance-imaging-for-prostate-cancer-detection-and-prediction-of-aggressiveness
#14
Alexander D J Baur, Julia Schwabe, Julian Rogasch, Andreas Maxeiner, Tobias Penzkofer, Carsten Stephan, Marc Rudl, Bernd Hamm, Ernst-Michael Jung, Thom Fischer
INTRODUCTION: Dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) and contrast-enhanced ultrasound (CEUS) analyse tissue vascularization. We evaluated if CEUS can provide comparable information as DCE-MRI for the detection of prostate cancer (PCa) and prediction of its aggressiveness. MATERIAL AND METHODS: A post-hoc evaluation of 92 patients was performed. In each patient CEUS and DCE-MRI parameters of the most suspicious lesion identified on MRI were analysed...
December 13, 2017: European Radiology
https://www.readbyqxmd.com/read/29238217/effects-of-voluntary-exercise-on-blood-pressure-angiotensin-ii-aldosterone-and-renal-function-in-two-kidney-one-clip-hypertensive-rats
#15
Brian M Waldman, Robert A Augustyniak, Haiping Chen, Noreen F Rossi
Spontaneous dynamic exercise promotes sympathoinhibition and decreases arterial pressure in two-kidney, one-clip (2K-1C) hypertensive rats. Renal sympathetic nerves stimulate renin secretion and increase renal tubular sodium reabsorption. We hypothesized that daily voluntary wheel running exercise by 2K-1C rats will decrease mean arterial pressure (MAP), plasma angiotensin II (Ang II), and aldosterone as well as normalize urinary sodium and potassium excretion independent of changes in glomerular filtration rate (GFR)...
2017: Integrated Blood Pressure Control
https://www.readbyqxmd.com/read/29237774/quantitative-multiplexed-imaging-analysis-reveals-a-strong-association-between-immunogen-specific-b-cell-responses-and-tonsillar-germinal-center-immune-dynamics-in-children-after-influenza-vaccination
#16
Donato Amodio, Nicola Cotugno, Giulia Macchiarulo, Salvatore Rocca, Yiannis Dimopoulos, Maria Rita Castrucci, Rita De Vito, Filippo M Tucci, Adrian B McDermott, Sandeep Narpala, Paolo Rossi, Richard A Koup, Paolo Palma, Constantinos Petrovas
Generation of Ag-specific humoral responses requires the orchestrated development and function of highly specialized immune cells in secondary lymphoid organs. We used a multiparametric approach combining flow cytometry, confocal microscopy, and histocytometry to analyze, for the first time to our knowledge in children, tonsils from seasonal influenza-vaccinated children. We used these novel imaging assays to address the mucosal immune dynamics in tonsils investigating the spatial positioning, frequency, and phenotype of immune cells after vaccination...
December 13, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29237297/the-evolutionary-psychology-of-war-offense-and-defense-in-the-adapted-mind
#17
Anthony C Lopez
The study of warfare from an evolutionary perspective has expanded rapidly over the last couple of decades. However, it has tended to focus on the ancestral origins, prevalence, and instruments of war rather than adaptationist analyses of its underlying psychology. I argue that our evolved coalitional psychology may contain a set of distinct evolved heuristics designed specifically for offensive and defensive coalitional aggression. Data from two survey experiments are presented, in which subjects were given scenarios depicting offensive or defensive aggression and were told to make decisions, for example, regarding their willingness to participate in the conflict, their opinions of others who did not choose to participate, and their expectations benefit...
October 2017: Evolutionary Psychology: An International Journal of Evolutionary Approaches to Psychology and Behavior
https://www.readbyqxmd.com/read/29237080/cardiopulmonary-coupling-spectrogram-as-an-ambulatory-clinical-biomarker-of-sleep-stability-and-quality-in-health-sleep-apnea-and-insomnia
#18
Robert Joseph Thomas, Christopher Wood, Matt Travis Bianchi
Study Objectives: Ambulatory tracking of sleep and sleep pathology is rapidly increasing with the introduction of wearable devices. The objective of this study was to evaluate a wearable device which used novel computational analysis of the electrocardiogram (ECG), collected over multiple nights, as a method to track the dynamics of sleep quality in health and disease. Methods: This study used the electrocardiogram as a primary signal, a wearable device, the M1, and an analysis of cardiopulmonary coupling to estimate sleep quality...
December 9, 2017: Sleep
https://www.readbyqxmd.com/read/29236911/assessment-of-the-quality-of-life-muscle-strength-and-dynamic-balance-of-elderly-kendo-players
#19
Dário Lucas Costa de Mendonça, Angelica Castilho Alonso, Júlia Maria D'Andrea Greve, Luiz Eugênio Garcez-Leme
OBJECTIVE: To compare Kendo players with active elderly adults in terms of quality of life, functional aspects (muscle strength, postural balance) and body composition. METHODS: This was a controlled cross-sectional study. Twenty elderly individuals were divided into two groups: the Kendo group, with an average age of 71.8 (5.4) years, and the Control group, with an average age of 73.1 (4.8) years. Quality of life was evaluated using a questionnaire (WHOQOL-bref and WHOQOL-old); body composition was evaluated with a bioimpedance scale (InBody230); hand-grip strength was assessed with a portable manual dynamometer (Jamar SH 5001); flexor and extensor muscle strength of the knees was evaluated with an isokinetic device (Biode® System 3 model Biodex Multi Joint System, BIODEX); and dynamic balance was assessed using a force platform (Balance Master System, Neurocom International, Inc...
November 2017: Clinics
https://www.readbyqxmd.com/read/29236868/richness-and-structure-of-ant-assemblies-hymenoptera-formicidae-in-atlantic-forest-in-southern-brazil
#20
Junir A Lutinski, Cladis J Lutinski, Carin Guarda, Maria A Busato, Flávio R M Garcia
Ant diversity is influenced by the structural complexity of the environment. Ants are thus an ecologically important group due to their potential to serve as indicators of environmental quality. The objective of this study was to evaluate ant diversity in areas with different land use histories and thus, within different stages of regeneration in the Permanent Preservation Area of the Foz do Chapecó Hydroelectric Plant reservoir. Ant assemblies among sample sites were compared using rarefaction analysis, and estimated richness, frequency of occurrence, and relative abundance were calculated...
December 11, 2017: Anais da Academia Brasileira de Ciências
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