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https://www.readbyqxmd.com/read/28750285/modelling-food-web-mediated-effects-of-hydrological-variability-and-environmental-flows
#1
REVIEW
Barbara J Robson, Rebecca E Lester, Darren S Baldwin, Nicholas R Bond, Romain Drouart, Robert J Rolls, Darren S Ryder, Ross M Thompson
Environmental flows are designed to enhance aquatic ecosystems through a variety of mechanisms; however, to date most attention has been paid to the effects on habitat quality and life-history triggers, especially for fish and vegetation. The effects of environmental flows on food webs have so far received little attention, despite food-web thinking being fundamental to understanding of river ecosystems. Understanding environmental flows in a food-web context can help scientists and policy-makers better understand and manage outcomes of flow alteration and restoration...
July 17, 2017: Water Research
https://www.readbyqxmd.com/read/28750242/rotational-diffusion-of-magnetic-nanoparticles-in-protein-solutions
#2
Ana C Bohórquez, Chuncheng Yang, Donald Bejleri, Carlos Rinaldi
The rotational diffusion of polyethylene glycol coated magnetic nanoparticles in serum albumin solutions was investigated in a range spanning 0mgmL(-1) to 200mgmL(-1). Rotational diffusivities were determined from dynamic magnetic susceptibility measurements, which provide a non-optical means to probe rotation of nanoparticles in small volume samples. Experimental rotational diffusivities were compared to those estimated using the Stokes-Einstein relation and macroscopic measurements of the viscosity of the protein solutions...
July 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28746885/injectable-hydrogel-based-on-quaternized-chitosan-gelatin-and-dopamine-as-localized-drug-delivery-system-to-treat-parkinson-s-disease
#3
Yizhuo Ren, Xin Zhao, Xiaofeng Liang, Peter X Ma, Baolin Guo
There is still an enormous demand for designing materials to the treatment of Parkinson's disease, and dopamine-based injectable polysaccharide hydrogels as localized drug delivery system have huge potential. Here, we developed a facile approach to prepare dopamine-based and polydopamine crosslinked injectable hydrogels by simply oxidizing a mixture of quaternized chitosan, gelatin and dopamine under physiological conditions. These injectable quaternized hydrogels showed stable mechanical strength by rheometer and exhibited good degradability evaluated by in vitro degradation test...
July 23, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28744869/a-meta-analysis-on-growth-physiological-and-biochemical-responses-of-woody-species-to-ground-level-ozone-highlights-the-role-of-plant-functional-types
#4
Pin Li, Zhaozhong Feng, Vicent Catalayud, Xiangyang Yuan, Yansen Xu, Elena Paoletti
The carbon-sink strength of temperate and boreal forests at mid-latitudes of the northern hemisphere is decreased by ozone pollution, but knowledge on subtropical evergreen broadleaved forests is missing. Taking the dataset from Chinese studies covering temperate and subtropical regions, effects of elevated ozone concentration ([O3 ]) on growth, biomass and functional leaf traits of different types of woody plants were quantitatively evaluated by meta-analysis. Elevated mean [O3 ] of 116 ppb reduced total biomass of woody plants by 14% compared with control (mean [O3 ] of 21 ppb)...
July 25, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28739023/suture-bridge-transosseous-equivalent-repair-is-stronger-than-transosseous-tied-braided-tape
#5
Jérémie Ménard, Benjamin Léger-St-Jean, Frédéric Balg, Yvan Petit, Marc Beauchamp, Dominique M Rouleau
BACKGROUND: This study biomechanically compares two methods of supraspinatus repair: single row transosseous braided-tape (BT) and suture bridge transosseous equivalent (SBTE) with 2 medial anchors and 2 lateral anchors. The purpose is to test the hypothesis that BT provides superior or equal biomechanical strength compared to SBTE. METHODS: Nine pairs of frozen cadaveric shoulders were selected and both repair techniques were tested on each pair, using a biomechanical testing unit to measure cyclic loading and ultimate load to failure...
July 21, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/28737503/directional-connectivity-in-the-eeg-is-able-to-discriminate-wakefulness-from-nrem-sleep
#6
Giulia Lioi, Steven L Bell, David C Smith, David M Simpson
A reliable measure of consciousness is of great interest for various clinical applications including sleep studies and the assessment of depth of anaesthesia. A number of measures of consciousness based on the EEG have been proposed in the literature and tested in studies of dreamless sleep, general anaesthesia and disorders of consciousness. However, reliability has remained a persistent challenge. Despite considerable theoretical and experimental effort, the neural mechanisms underlying consciousness remain unclear, but connectivity between brain regions is thought to be disrupted, impairing information flow...
July 24, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28736534/self-organizing-complex-networks-individual-versus-global-rules
#7
Korosh Mahmoodi, Bruce J West, Paolo Grigolini
We introduce a form of Self-Organized Criticality (SOC) inspired by the new generation of evolutionary game theory, which ranges from physiology to sociology. The single individuals are the nodes of a composite network, equivalent to two interacting subnetworks, one leading to strategy choices made by the individuals under the influence of the choices of their nearest neighbors and the other measuring the Prisoner's Dilemma Game payoffs of these choices. The interaction between the two networks is established by making the imitation strength K increase or decrease according to whether the last two payoffs increase or decrease upon increasing or decreasing K...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28731978/differences-in-spatiotemporal-parameters-between-trained-runners-and-untrained-participants
#8
Josué Gómez-Molina, Ana Ogueta-Alday, Christopher Stickley, Jesús Cámara, Jon Cabrejas-Ugartondo, Juan García-López
Gómez-Molina, J, Ogueta-Alday, A, Stickley, C, Tobalina, JC, Cabrejas-Ugartondo, J, and García-López, J. Differences in spatiotemporal parameters between trained runners and untrained participants. J Strength Cond Res 31(8): 2169-2175, 2017-The aim of this study was to compare the spatiotemporal parameters of trained runners and untrained participants with the same foot strike pattern (rearfoot) during running at controlled speeds. Twenty-one participants were classified in 2 groups according to their training experience: Trained (n = 10, amateur runners with long distance training experience) and Untrained (n = 11, healthy untrained participants)...
August 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28731832/effects-of-cervical-high-velocity-low-amplitude-techniques-on-range-of-motion-strength-performance-and-cardiovascular-outcomes-a-review
#9
Xabier Galindez-Ibarbengoetxea, Igor Setuain, Lars L Andersen, Robinson Ramírez-Velez, Miriam González-Izal, Andoni Jauregi, Mikel Izquierdo
BACKGROUND: Cervical high-velocity low-amplitude (HVLA) manipulation technique is among the oldest and most frequently used chiropractic manual therapy, but the physiologic and biomechanics effects were not completely clear. OBJECTIVE: This review aims to describe the effects of cervical HVLA manipulation techniques on range of motion, strength, and cardiovascular performance. METHODS/DESIGN: A systematic search was conducted of the electronic databases from January 2000 to August 2016: PubMed (n = 131), ScienceDirect (n = 101), Scopus (n = 991), PEDro (n = 33), CINAHL (n = 884), and SciELO (n = 5)...
July 21, 2017: Journal of Alternative and Complementary Medicine: Research on Paradigm, Practice, and Policy
https://www.readbyqxmd.com/read/28730344/bearing-fruit-flower-removal-reveals-the-trade-offs-associated-with-high-reproductive-effort-for-lowbush-blueberry
#10
Alex W Bajcz, Francis A Drummond
Past studies have shown that taxa from disparate groups often respond similarly to reduced reproductive effort. These common responses imply that high reproductive effort trades off with a consistent set of other life functions for most angiosperms, albeit modulated by their growth form and life history. However, many questions remain about reproductive trade-offs in plants, including just how many other life functions they involve, how diverse these functions may be, and how the severity of these trade-offs may vary through time...
July 20, 2017: Oecologia
https://www.readbyqxmd.com/read/28730206/evaluation-of-dextran-ethylene-glycol-hydrogel-films-for-giant-unilamellar-lipid-vesicle-production-and-their-application-for-the-encapsulation-of-polymersomes
#11
Nestor Lopez Mora, Yue Gao, M Gertrude Gutierrez, Justin Peruzzi, Ivan Bakker, Ruud J R W Peters, Bianka Siewert, Sylvestre Bonnet, Roxanne E Kieltyka, Jan C M van Hest, Noah Malmstadt, Alexander Kros
Giant Unilamellar Vesicles (GUVs) prepared from phospholipids are becoming popular membrane model systems for use in biophysical studies. The quality, size and yield of GUVs depend on the preparation method used to obtain them. In this study, hydrogels consisting of dextran polymers crosslinked by poly(ethylene glycol) (DexPEG) were used as hydrophilic frameworks for the preparation of vesicle suspensions under physiological ionic strength conditions. A comparative study was conducted using hydrogels with varied physicochemical properties to evaluate their performance for GUV production...
July 21, 2017: Soft Matter
https://www.readbyqxmd.com/read/28729713/tunable-uptake-release-mechanism-of-protein-microgel-particles-in-biomimicking-environment
#12
A Pepe, P Podesva, G Simone
Microgels are intra-molecular crosslinked macromolecules that can be used as vehicles to deliver and release drugs at the point-of-need in the patient's body. Here, gelatin microgels were formed from microfluidics droplets, stabilised by aldehydes and frozen into a spheroidal shape. Microgel morphology and response to external stimuli were characterised. It was found that the behaviour of the spheroidal microgels was sensitive to both pH and ionic strength and that the distribution of charges into the microgels affected the behaviour of swelling and uptake...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28728933/predictors-of-mortality-in-pulmonary-sarcoidosis
#13
Gamze Kirkil, Elyse E Lower, Robert P Baughman
OBJECTIVES: To assess the prognostic strength of factors in predicting respiratory death in a large cohort of sarcoidosis patients with at least eight years' follow-up. METHODS: We collected age, sex, self-declared race, time of death, spirometry, diffusing capacity for carbon monoxide, chest x-ray stage, extent of fibrosis on high resolution computer tomography (HRCT), and presence of pre-capillary pulmonary hypertension (PH). The gender, age, physiology (GAP) index and Walsh's criteria for high versus low risk were calculated...
July 17, 2017: Chest
https://www.readbyqxmd.com/read/28728024/origins-of-cell-type-specific-olfactory-processing-in-the-drosophila-mushroom-body-circuit
#14
Kengo Inada, Yoshiko Tsuchimoto, Hokto Kazama
How cell-type-specific physiological properties shape neuronal functions in a circuit remains poorly understood. We addressed this issue in the Drosophila mushroom body (MB), a higher olfactory circuit, where neurons belonging to distinct glomeruli in the antennal lobe feed excitation to three types of intrinsic neurons, α/β, α'/β', and γ Kenyon cells (KCs). Two-photon optogenetics and intracellular recording revealed that whereas glomerular inputs add similarly in all KCs, spikes were generated most readily in α'/β' KCs...
July 19, 2017: Neuron
https://www.readbyqxmd.com/read/28727758/longevity-effect-of-a-polysaccharide-from-chlorophytum-borivilianum-on-caenorhabditis-elegans-and-saccharomyces-cerevisiae
#15
Steve Thomas Pannakal, Sibylle Jäger, Albert Duranton, Amit Tewari, Subarna Saha, Aneesha Radhakrishnan, Nita Roy, Jean François Kuntz, Soraya Fermas, Darryl James, Jane Mellor, Namita Misra, Lionel Breton
The traditional Indian medicine, Ayurveda, provides insights and practical solutions towards a healthy life style. Rasayana is a branch of Ayurveda known for preserving and promoting health, enhancing the quality of life and delaying the aging process. In the traditional knowledge, the Rasayana herb, Chlorophytum borivilianum (C. borivilanum) is regarded as a general health promoting tonic that delays aging and increases lifespan, cognitive function and physical strength. Aging is a complex and multifactorial physiological phenomenon that manifests itself over a wide range of biological systems, tissues, and functions...
2017: PloS One
https://www.readbyqxmd.com/read/28726630/dissection-of-specific-binding-of-hiv-1-gag-to-the-packaging-signal-in-viral-rna
#16
Mauricio Comas-Garcia, Siddhartha Ak Datta, Laura Baker, Rajat Varma, Prabhakar R Gudla, Alan Rein
Selective packaging of HIV-1 genomic RNA (gRNA) requires the presence of a cis-acting RNA element called the 'packaging signal' (Ψ). However, the mechanism by which Ψ promotes selective packaging of the gRNA is not well understood. We used fluorescence correlation spectroscopy and quenching data to monitor the binding of recombinant HIV-1 Gag protein to Cy5-tagged 190-base RNAs. At physiological ionic strength, Gag binds with very similar, nanomolar affinities to both Ψ-containing and control RNAs. We challenged these interactions by adding excess competing tRNA; introducing mutations in Gag; or raising the ionic strength...
July 20, 2017: ELife
https://www.readbyqxmd.com/read/28725446/sound-a-non-invasive-measure-of-cough-intensity
#17
Kai K Lee, Sergio Matos, Katie Ward, Gerrard F Rafferty, John Moxham, David H Evans, Surinder S Birring
INTRODUCTION: Cough intensity is an important determinant of cough severity reported by patients. Cough sound analysis has been widely validated for the measurement of cough frequency but few studies have validated its use in the assessment of cough strength. We investigated the relationship between cough sound and physiological measures of cough strength. METHODS: 32 patients with chronic cough and controls underwent contemporaneous measurements of voluntary cough sound, flow and oesophageal pressure...
2017: BMJ Open Respiratory Research
https://www.readbyqxmd.com/read/28721740/clinical-features-and-subjective-physiological-responses-to-emotional-stimuli-in-the-presence-of-emotion-dysregulation-in-attention-deficit-hyperactivity-disorder
#18
Candan Taskiran, Serkan Karaismailoglu, Halime Tuna Cak Esen, Zeynep Tuzun, Aysen Erdem, Zeynep Dicle Balkanci, Anil Barak Dolgun, Sadriye Ebru Cengel Kultur
INTRODUCTION: Emotion dysregulation (ED) has long been recognized in clinical descriptions of attention-deficit hyperactivity disorder (ADHD), but a renewed interest in ED has advanced research on the overlap between the two entities. Autonomic reactivity (AR) is a neurobiological correlate of emotion regulation; however, the association between ADHD and AR remains unclear. Our aim was to explore the clinical differences, AR, and subjective emotional responses to visual emotional stimuli in ADHD children with and without ED...
July 19, 2017: Journal of Clinical and Experimental Neuropsychology
https://www.readbyqxmd.com/read/28720661/stabilization-of-f-actin-by-tropomyosin-isoforms-regulates-the-morphology-and-mechanical-behavior-of-red-blood-cells
#19
Zhenhua Sui, David S Gokhin, Roberta B Nowak, Xinhua Guo, Xiuli An, Velia M Fowler
The short F-actins in the red blood cell (RBC) membrane skeleton are coated along their lengths by an equimolar combination of two tropomyosin isoforms, Tpm1.9 and Tpm3.1. We hypothesized that tropomyosins' ability to stabilize F-actin regulates RBC morphology and mechanical properties. To test this, we examined mice with a targeted deletion in alternatively spliced exon 9d of Tpm3 (Tpm3/9d(-/-) ), which leads to absence of Tpm3.1 in RBCs along with a compensatory increase in Tpm1.9 of sufficient magnitude to maintain normal total tropomyosin content...
July 18, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28720232/meta-analysis-of-the-predictive-factors-of-postpartum-fatigue
#20
Hanan A Badr, Jaclene A Zauszniewski
PURPOSE: Nearly 64% of new mothers are affected by fatigue during the postpartum period, making it the most common problem that a woman faces as she adapts to motherhood. Postpartum fatigue can lead to serious negative effects on the mother's health and the newborn's development and interfere with mother-infant interaction. The aim of this meta-analysis was to identify predictive factors of postpartum fatigue and to document the magnitude of their effects using effect sizes. METHOD: We used two search engines, PubMed and Google Scholar, to identify studies that met three inclusion criteria: (a) the article was written in English, (b) the article studied the predictive factors of postpartum fatigue, and (c) the article included information about the validity and reliability of the instruments used in the research...
August 2017: Applied Nursing Research: ANR
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