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https://www.readbyqxmd.com/read/29786740/shear-density-coupling-for-a-compressible-single-component-yield-stress-fluid
#1
Markus Gross, Fathollah Varnik
Flow behavior of a single-component yield stress fluid is addressed on the hydrodynamic level. A basic ingredient of the model is a coupling between fluctuations of density and velocity gradient via a Herschel-Bulkley-type constitutive model. Focusing on the limit of low shear rates and high densities, the model approximates well-but is not limited to-gently sheared hard sphere colloidal glasses, where solvent effects are negligible. A detailed analysis of the linearized hydrodynamic equations for fluctuations and the resulting cubic dispersion relation reveals the existence of a range of densities and shear rates with growing flow heterogeneity...
May 22, 2018: Soft Matter
https://www.readbyqxmd.com/read/29785469/early-detection-of-cerebral-infarction-after-focal-ischemia-using-a-new-mri-indicator
#2
Yukako Nakajo, Qiang Zhao, Jun-Ichiro Enmi, Hidehiro Iida, Jun C Takahashi, Hiroharu Kataoka, Keiko Yamato, Hiroji Yanamoto
Prolongation of the T2 relaxation time, an increase in T2-weighted signal intensity (T2-SI), and a decrease in the apparent diffusion coefficient (ADC) calculated from diffusion-weighted images (DWI) on magnetic resonance imaging (MRI) are conventional indicators of the vasogenic (interstitial) or cytotoxic (cellular) cerebral edema that develops after ischemic stroke. However, these parameters obtained on stroke imaging have not given us a precise threshold at which we can determine the viability or vulnerability of the tissue, allowing us to decide on an intervention that will help reversible tissue in the acute phase...
May 21, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29785431/slow-magnetic-relaxation-and-luminescence-properties-in-lanthanide-iii-anil-complexes
#3
Diamantoula Maniaki, Ioannis Mylonas-Margaritis, Julia Mayans, Aikaterini Savvidou, Catherine P Raptopoulou, Vlasoula Bekiari, Vassilis Psycharis, Albert Escuer, Spyros P Perlepes
The initial use of anils, i.e. bidentate Schiff bases derived from the condensation of anilines with salicylaldehyde or its derivatives, in 4f-metal chemistry is described. The 1 : 1 reactions between Ln(NO3)3·xH2O (Ln = lanthanide) or Y(NO3)3·6H2O and N-(5-bromosalicylidene)aniline (5BrsalanH) in MeCN has provided access to complexes [Ln(NO3)3(5BrsalanH)2(H2O)]·MeCN (Ln = Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb) and [Y(NO3)3(5BrsalanH)2(H2O)]·MeCN, respectively, in good yields. The structures of the isomorphous complexes with Ln = Pr(1·MeCN), Sm(3·MeCN), Gd(5·MeCN), Dy(7·MeCN) and Er(9·MeCN) have been determined by single-crystal X-ray crystallography...
May 22, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29785247/being-enjoyably-challenged-is-the-key-to-an-enjoyable-gaming-experience-an-experimental-approach-in-a-first-person-shooter-game
#4
Anne Corcos
Applied to video games, Csikszentmihalyi's work on flow evidences that a positive gaming experience is intrinsically self-rewarding and primarily determined by the skill/challenge balance. A multi-layered measure of enjoyment is built to take these components into account. Gamers were asked to report the concentration-enjoyment they experienced during a first-person shooter game, and to better assess the gap between skill and challenge, the challenge enjoyment was also rated. Along with concentration level, concentration enjoyment is used to build a gaming experience typology that accounts for the self-rewarding component...
2018: Socioaffective Neuroscience & Psychology
https://www.readbyqxmd.com/read/29785198/effects-of-walking-in-bamboo-forest-and-city-environments-on-brainwave-activity-in-young-adults
#5
Ahmad Hassan, Jiang Tao, Guo Li, Mingyan Jiang, Liu Aii, Jiang Zhihui, Liu Zongfang, Chen Qibing
Background . In Japan, "Shinrin-yoku" or forest bathing (spending time in forests) is a major practice used for relaxation. However, its effects on promoting human mental health are still under consideration. The objective of this study was to investigate the physiological and psychological relaxation effects of forest walking on adults. Sixty participants (50% males; 50% females) were trained to walk 15-minute predetermined courses in a bamboo forest and a city area (control). The length of the courses was the same to allow comparison of the effects of both environments...
2018: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/29785049/involvement-of-inhibitor-kappa-b-kinase-2-ikk2-in-the-regulation-of-vascular-tone
#6
Youngin Kwon, Soo-Kyoung Choi, Seonhee Byeon, Young-Ho Lee
Inhibitor kappa B kinase 2 (IKK2) plays an essential role in the activation of nuclear factor kappa B (NF-kB). Recently, it has been suggested that IKK2 acts as a myosin light chain kinase (MLCK) and contributes to vasoconstriction in mouse aorta. However, the underlying mechanisms are still unknown. Therefore, we investigated whether IKK2 acts as a MLCK or regulates the activity of myosin light chain phosphatase (MLCP). Pressure myograph was used to measure vascular tone in rat mesenteric arteries. Immunofluorescence staining was performed to identify phosphorylation levels of MLC (ser19), MYPT1 (thr853 and thr696) and CPI-17 (thr38)...
May 21, 2018: Laboratory Investigation; a Journal of Technical Methods and Pathology
https://www.readbyqxmd.com/read/29784951/tomographic-and-multimodal-scattering-type-scanning-near-field-optical-microscopy-with-peak-force-tapping-mode
#7
Haomin Wang, Le Wang, Devon S Jakob, Xiaoji G Xu
Scattering-type scanning near-field optical microscopy (s-SNOM) enables nanoscale spectroscopic imaging and has been instrumental for many nano-photonic discoveries and in situ studies. However, conventional s-SNOM techniques with atomic force microscopy tapping mode operation and lock-in detections do not provide direct tomographic information with explicit tip-sample distance. Here, we present a non-traditional s-SNOM technique, named peak force scattering-type scanning near-field optical microscopy (PF-SNOM), by combination of peak force tapping mode and time-gated light detection...
May 21, 2018: Nature Communications
https://www.readbyqxmd.com/read/29784617/evolution-of-echocardiographic-measures-of-cardiac-disease-from-ckd-to-esrd-and-risk-of-all-cause-mortality-findings-from-the-cric-study
#8
Nisha Bansal, Jason Roy, Hsiang-Yu Chen, Rajat Deo, Mirela Dobre, Michael J Fischer, Elyse Foster, Alan S Go, Jiang He, Martin G Keane, John W Kusek, Emile Mohler, Sankar D Navaneethan, Mahboob Rahman, Chi-Yuan Hsu
RATIONALE & OBJECTIVE: Abnormal cardiac structure and function are common in chronic kidney disease (CKD) and end-stage renal disease (ESRD) and linked with mortality and heart failure. We examined changes in echocardiographic measures during the transition from CKD to ESRD and their associations with post-ESRD mortality. STUDY DESIGN: Prospective study. SETTING & PARTICIPANTS: We studied 417 participants with CKD in the Chronic Renal Insufficiency Cohort (CRIC) who had research echocardiograms during CKD and ESRD...
May 18, 2018: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/29784354/a-comparative-study-of-sterically-and-electro-statically-stabilized-silver-nanoparticles-for-the-determination-of-muscle-relaxant-tizanidine-insights-of-localized-surface-plasmon-resonance-surface-enhanced-raman-spectroscopy-and-electrocatalytic-activity
#9
Marwa R El-Zahry
A comparative study of two types of silver nanoparticles was investigated. The effect of the surface chemistry of the studied silver nanoparticles (AgNPs) on their localized surface plasmon resonance was utilized for the quantitative determination of muscle relaxant tizanidine drug. The studied AgNPs are classified according to the type of stabilizing agent used in their synthesis into electrostatically and sterically stabilized AgNPs. The electrostatically-stabilized AgNPs (AA AgNPs) were prepared using ascorbic acid as both reducing and protective agents in alkaline medium...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784332/whey-acerola-flavoured-drink-submitted-ohmic-heating-bioactive-compounds-antioxidant-capacity-thermal-behavior-water-mobility-fatty-acid-profile-and-volatile-compounds
#10
Leandro P Cappato, Marcus Vinicius S Ferreira, Jeremias Moraes, Roberto P S Pires, Ramon S Rocha, Ramon Silva, Roberto P C Neto, Maria Inês B Tavares, Mônica Q Freitas, Flavio N Rodrigues, Veronica M A Calado, Renata S L Raices, Marcia C Silva, Adriano G Cruz
Whey acerola-flavoured drink was subjected to Ohmic Heating (OH) under different operational conditions (45, 60, 80 V at 60 Hz and 10, 100, 1000 Hz with 25 V, 65 °C/30 min) and conventional pasteurization (65 °C/30 min). Bioactive compounds (total phenolics, DPPH, FRAP, ACE levels), fatty acid profile, volatile compounds (CG-MS), thermal behaviors (DSC) and water mobility (TD-NMR) were performed. Reduction of frequency (1000-10 Hz) resulted in a lower bioactive compounds and antioxidant capacity of the samples, except for the DPPH values...
October 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29784214/implementing-non-violent-resistance-a-method-to-cope-with-aggression-in-child-and-adolescent-residential-care-exploration-of-staff-members-experiences
#11
Kirsten van Gink, Katharina Visser, Arne Popma, Robert R J M Vermeiren, Lieke van Domburgh, Ber van der Stegen, Lucres M C Jansen
Staff members in residential care for youth are frequently confronted with aggressive behaviour, which has adverse effects on their stress levels and work satisfaction. This paper describes a qualitative evaluation to find out how staff members benefit from Non-violent Resistance (NVR), a method to create an aggression mitigating residential climate. Staff members were positive about NVR and reported feeling more relaxed. Most valued aspects of this method were the focus on being a team, delayed response and giving up the illusion of control...
June 2018: Archives of Psychiatric Nursing
https://www.readbyqxmd.com/read/29783697/three-dimensional-bi%C3%A2-te%C3%A2-networks-of-interconnected-nanowires-synthesis-and-optimization
#12
Alejandra Ruiz-Clavijo, Olga Caballero-Calero, Marisol Martín-González
Self-standing Bi₂Te₃ networks of interconnected nanowires were fabricated in three-dimensional porous anodic alumina templates (3D⁻AAO) with a porous structure spreading in all three spatial dimensions. Pulsed electrodeposition parameters were optimized to grow highly oriented Bi₂Te₃ interconnected nanowires with stoichiometric composition inside those 3D⁻AAO templates. The nanowire networks were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and Raman spectroscopy...
May 18, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29783645/carbon-dots-doped-with-dysprosium-a-bimodal-nanoprobe-for-mri-and-fluorescence-imaging
#13
Timur Sh Atabaev, Zhonglie Piao, Anara Molkenova
In recent years, functional nanoprobes with multiple imaging modalities have become an emerging field of biomedical research. In this preliminary study, we utilized a facile hydrothermal method for the preparation of magneto-fluorescent bimodal carbon dots doped with dysprosium (Dy-CDs). The prepared Dy-CDs have shown a good colloidal stability in a water solution and strong blue⁻green fluorescence, with a maximum at 452 nm. In addition, the excellent transverse relaxivity of the prepared Dy-CDs (r₂ = 7...
May 18, 2018: Journal of Functional Biomaterials
https://www.readbyqxmd.com/read/29783626/development-and-characterization-of-high-performance-shape-memory-alloy-coatings-for-structural-aerospace-applications
#14
Dimitrios A Exarchos, Panagiota T Dalla, Ilias K Tragazikis, Konstantinos G Dassios, Nikolaos E Zafeiropoulos, Maria M Karabela, Carmen De Crescenzo, Despina Karatza, Dino Musmarra, Simeone Chianese, Theodore E Matikas
This paper presents an innovative approach, which enables control of the mechanical properties of metallic components by external stimuli to improve the mechanical behavior of aluminum structures in aeronautical applications. The approach is based on the exploitation of the shape memory effect of novel Shape Memory Alloy (SMA) coatings deposited on metallic structural components, for the purpose of relaxing the stress of underlying structures by simple heating at field-feasible temperatures, therefore enhancing their structural integrity and increasing their stiffness and rigidity while allowing them to withstand expected loading conditions safely...
May 18, 2018: Materials
https://www.readbyqxmd.com/read/29782965/membrane-cholesterol-delays-cellular-apoptosis-induced-by-ginsenoside-rh2-a-steroid-saponin
#15
Sandrine L Verstraeten, Marie Albert, Adrien Paquot, Giulio G Muccioli, Donatienne Tyteca, Marie-Paule Mingeot-Leclercq
Saponins exhibit several biological and pharmacological activities, such as antibacterial, anti-inflammatory and anticancer effects. Many studies attribute their activities to their interactions with cholesterol. In this study, we focus on the steroid saponin ginsenoside Rh2, one of the active principles of Panax ginseng root. Some evidence suggests that lipid rafts, defined as nanodomains enriched in cholesterol and sphingolipids, could be involved in the Rh2-induced apoptosis. However, the role of membrane lipids, especially cholesterol, in this process is still poorly understood...
May 18, 2018: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/29782857/quaternary-ammonium-salt-of-u50-488h-elicits-protective-effects-against-hypoxic-pulmonary-hypertension
#16
Yaguang Zhou, Xin Tian, Xueying Wang, Yuanbo Wang, Rong Fan, Yuemin Wang, Na Feng, Shumiao Zhang, Haitao Guo, Xiaoming Gu, Min Jia, Wen Yin, Zuoxu Hou, Juan Li, Jianming Pei
The present study aimed to investigate the role of quaternary ammonium salt of U50,488H (Q-U50,488H) in hypoxic pulmonary hypertension (HPH) and underlying mechanisms involved. A HPH animal model was established in rats under hypoxia and the mean pulmonary arterial pressure (mPAP) and right ventricular pressure (RVP) were measured. Relaxation of the pulmonary artery in response to Q-U50,488H was determined. In addition, expression and activity of endothelial nitric oxide (NO) synthase (eNOS) and inducible NO synthase (iNOS) with NO content, Akt expression, total antioxidant capacity (T-AOC), and gp91phox were evaluated...
May 18, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29782281/-effect-of-chronic-kidney-disease-on-the-formation-of-diastolic-heart-dysfunction-in-heart-failure-patients-with-preserved-ejection-fraction
#17
O B Kuzmin, V V Zezha, V V Belyanin, N V Buchneva
Chronic kidney disease is observed in most patients with CHF with preserved ejection fraction (HFpEF) and presents a major risk factor facilitating development and progression of LV diastolic dysfunction. The review focused on the effect of chronic kidney disease on intracellular signaling pathways affecting stiffness and diastolic relaxation of cardiomyocytes in response to inflammation and endothelial dysfunction of coronary capillaries, excessive sympathetic activation, and dysregulation of natriuretic peptides, which directly participate in the development of CHF...
2018: Kardiologiia
https://www.readbyqxmd.com/read/29782258/-contractile-function-of-isolated-hearts-with-preserved-and-reduced-ejection-fraction-in-vivo
#18
V L Lakomkin, A A Abramov, V V Gramovich, O N Vyborov, I M Studneva, O I Pisarenko, V I Kapelko
The aim of the study was comparison of contractile function of isolated hearts of rats with doxorubicin-induced myocardial injury which were tentatively divided according to the level of ejection fraction determined by echocardiography in vivo. After 4 weeks of doxorubicin administration (2 mg/kg subcutaneously once a week) about half of animals had normal (86±1 %) and the other half reduced (61±4 %) ejection fraction. The first group was defined as diastolic heart failure (DHF) and the other as systolic (SHF)...
April 2018: Kardiologiia
https://www.readbyqxmd.com/read/29781805/hot-electron-cooling-in-dirac-semimetal-cd-sub-3-sub-as-sub-2-sub-due-to-polar-optical-phonons
#19
Shrishail S Kubakaddi, Tutul Biswas
A theory of hot electron cooling power due to polar optical phonons $P_{\rm op}$ is developed in
 three-dimensional Dirac semimetal($3$DDS) Cd$_3$As$_2$ taking account of hot phonon effect. Hot phonon
 distribution $N_q$ and $P_{\rm op}$ are investigated as a function of electron temperature $T_e$,
 electron density $n_e$, and phonon relaxation time $\tau_p$. It is found that $P_{\rm op}$ increases
 rapidly (slowly) with $T_e$ at lower (higher) temperature regime.
 Whereas, $P_{\rm op}$ is weakly decreasing with increasing $n_e$...
May 21, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29781649/treatment-of-social-approach-processes-in-adults-with-social-anxiety-disorder
#20
Lynn E Alden, Kristin Buhr, Melisa Robichaud, Jennifer L Trew, M Leili Plasencia
OBJECTIVE: Despite the social impairment associated with social anxiety disorder (SAD), little research has examined the impact of treatment on positive relational functioning. Accordingly, the authors conducted a treatment outcome study to evaluate a cognitive behavior therapy (CBT) regimen augmented by a relational focus (CBT-R) relative to a graduated exposure-applied relaxation (GEAR) regimen and wait list (WL) control. To examine the mechanism(s) that underlies treatment effects, they used structural equation modeling (SEM) to evaluate two potential mediators, change in judgment biases and in safety behaviors...
June 2018: Journal of Consulting and Clinical Psychology
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