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https://www.readbyqxmd.com/read/29775712/rheological-and-fracturing-characteristics-of-a-novel-sulfonated-hydroxypropyl-guar-gum
#1
Liewei Qiu, Yiding Shen, Tao Wang, Chen Wang
A series of sulfonated hydroxypropyl guar gum (SHG) samples with different degrees of substitution (DSs) were prepared, and the SHG solution and SHG fracturing fluid were prepared and analyzed. The SHG aqueous solutions with different DSs all exhibit shear thinning behavior, which is well correlated with the Ostwald-deWaele model. Owing to the electrostatic repulsion of SHG molecular chains, SHG solutions with a higher DS will exhibit weaker thixotropic performance and strong anti-salinity ability. In addition, the SHG fracturing fluids, which were formed by interactions between SHG and organic zirconium, exhibit good temperature- and shear-resistant properties, proppant suspension properties, and salt tolerance...
May 15, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29775683/viscoelastic-modeling-of-the-fusion-of-multicellular-tumor-spheroids-in-growth-phase
#2
Guillaume Dechristé, Jérôme Fehrenbach, Elena Griseti, Valérie Lobjois, Clair Poignard
BACKGROUND: Since several decades, the experiments have highlighted the analogy of fusing cell aggregates with liquid droplets. The physical macroscopic models have been derived under incompressible assumptions. The aim of this paper is to provide a 3D model of growing spheroids, which is more relevant regarding embryo cell aggregates or tumor cell spheroids. METHODS: We extend the past approach to a compressible 3D framework in order to account for the tumor spheroid growth...
May 15, 2018: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/29775559/mechanosensitivity-of-mitochondr-ial-large-conductance-calcium-activated-potassium-channels
#3
Agnieszka Walewska, Bogusz Kulawiak, Adam Szewczyk, Piotr Koprowski
Potassium channels have been discovered in the inner mitochondrial membrane of various cells. These channels can regulate the mitochondrial membrane potential, the matrix volume, respiration and reactive species generation. Therefore, it is believed that their activation is cytoprotective in various tissues. In our study, the single-channel activity of a large-conductance calcium-activated potassium channel (mitoBKCa ) was measured by the patch-clamp technique on mitoplasts derived from mitochondria isolated from human glioma U-87 MG cells...
May 15, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29775216/neuroimmflammation-and-microglia-in-glaucoma-time-for-a-paradigm-shift
#4
REVIEW
Xin Wei, Kin-Sang Cho, Eric F Thee, Martine J Jager, Dong Feng Chen
Glaucoma is a complex neurodegenerative disease with many clinical subtypes. Some of its rare forms include pigmentary glaucoma, uveitic glaucoma and congenital glaucoma. While they all share common features of progressive retinal ganglion cell (RGC) loss, optic nerve damage and corresponding visual field loss, the exact mechanisms underlying glaucomatous neuron loss are not clear. This has largely hindered the development of a real cure for this disease. Elevated intraocular pressure (IOP) is a known major risk factor of glaucoma; however, progressive degeneration of RGCs and axons can also be found in patients with a normal IOP, i...
May 18, 2018: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/29774751/evaluation-of-articular-cartilage-injury-using-computed-tomography-with-axial-traction-in-the-ankle-joint
#5
Tomoyuki Nakasa, Yasunari Ikuta, Mikiya Sawa, Masahiro Yoshikawa, Yusuke Tsuyuguchi, Yuki Ota, Munekazu Kanemitsu, Nobuo Adachi
BACKGROUND: Although chondral or osteochondral injuries are usually assessed by magnetic resonance imaging, its accuracy can be low, presumably related to the relatively thin cartilage layer and the close apposition of the cartilage of the talus and tibial plafond. We hypothesized that axial traction could provide a contrast between the articular cartilage and joint cavity, and it enabled the simultaneous evaluation of cartilage and subchondral bone. The purpose of this study was to assess the feasibility of using computed tomography (CT) imaging with axial traction for the diagnosis of articular cartilage injuries...
May 1, 2018: Foot & Ankle International
https://www.readbyqxmd.com/read/29773252/-the-emergency-department-triage-nurse-a-constantly-evolving-role
#6
Claire Maillard Acker
The number of patients attending emergency departments is constantly growing. They are fast becoming a place of primary care. Early assessment of patients must guarantee the safety of their care. The triage nurse uses a clinical examination and a triage chart to classify the patients. The reception of the patients by the triage nurse is professional. With tension often high in emergency departments, triage nurses play a role in defusing situations, which could constitute the next area of focus of their professionalization...
May 2018: Soins; la Revue de Référence Infirmière
https://www.readbyqxmd.com/read/29772991/reconstruction-plate-based-antibiotic-cement-spacers-clinical-outcomes-and-description-of-technique
#7
Aditya V Maheshwari, Robert Pivec, Roby Abraham, Qais Naziri
The standard of care for chronic deep peri-prosthetic hip infection is a two-stage exchange with placement of a temporary antibiotic cement spacer and treatment with intravenous antibiotics. Several commercially available cement spacer options exist. We report on a novel antibiotic spacer that may be an efficient, cost-effective alternative. Medical records of all patients treated for deep peri-prosthetic hip infection after total hip arthroplasty between 2004 and 2012 were reviewed. Each antibiotic spacer was constructed from a 12- to 16-hole recon plate bent to provide adequate soft tissue tension and a cement ball that matched the acetabulum...
2018: Journal of Long-term Effects of Medical Implants
https://www.readbyqxmd.com/read/29772961/contrasts-in-older-persons-experiences-and-significant-others-perceptions-of-existential-loneliness
#8
Helena Larsson, Anna-Karin Edberg, Ingrid Bolmsjö, Margareta Rämgård
BACKGROUND: As frail older people might have difficulties in expressing themselves, their needs are often interpreted by others, for example, by significant others, whose information health care staff often have to rely on. This, in turn, can put health care staff in ethically difficult situations, where they have to choose between alternative courses of action. One aspect that might be especially difficult to express is that of existential loneliness. We have only sparse knowledge about whether, and in what way, the views of frail older persons and their significant others concerning existential loneliness are in concordance...
January 1, 2018: Nursing Ethics
https://www.readbyqxmd.com/read/29772835/one-dimensional-and-two-dimensional-analytical-solutions-for-functionally-graded-beams-with-different-moduli-in-tension-and-compression
#9
Xue Li, Jun-Yi Sun, Jiao Dong, Xiao-Ting He
The material considered in this study not only has a functionally graded characteristic but also exhibits different tensile and compressive moduli of elasticity. One-dimensional and two-dimensional mechanical models for a functionally graded beam with a bimodular effect were established first. By taking the grade function as an exponential expression, the analytical solutions of a bimodular functionally graded beam under pure bending and lateral-force bending were obtained. The regression from a two-dimensional solution to a one-dimensional solution is verified...
May 17, 2018: Materials
https://www.readbyqxmd.com/read/29772382/enhanced-biodegradation-of-hydrocarbons-in-petroleum-tank-bottom-oil-sludge-and-characterization-of-biocatalysts-and-biosurfactants
#10
S Hepziba Suganthi, Shabnam Murshid, Sriswarna Sriram, K Ramani
Petroleum hydrocarbon removal from tank bottom oil sludge is a major issue due to its properties. Conventional physicochemical treatment techniques are less effective. Though the bioremediation is considered for the hydrocarbon removal from tank bottom oil sludge, the efficiency is low and time taking due to the low yield of biocatalysts and biosurfactants. The focal theme of the present investigation is to modify the process by introducing the intermittent inoculation for the enhanced biodegradation of hydrocarbons in the tank bottom oil sludge by maintaining a constant level of biocatalysts such as oxidoreductase, catalase, and lipase as well as biosurfactants...
May 14, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29772357/modelling-the-dorsal-root-ganglia-using-human-pluripotent-stem-cells-a-platform-to-study-peripheral-neuropathies
#11
Serena Viventi, Mirella Dottori
Sensory neurons of the dorsal root ganglia (DRG) are the primary responders to stimuli inducing feelings of touch, pain, temperature, vibration, pressure and muscle tension. They consist of multiple subpopulations based on their morphology, molecular and functional properties. Our understanding of DRG sensory neurons has been predominantly driven by rodent studies and using transformed cell lines, whereas less is known about human sensory DRG neurons simply because of limited availability of human tissue. Although these previous studies have been fundamental for our understanding of the sensory system, it is imperative to profile human DRG subpopulations as it is becoming evident that human sensory neurons do not share the identical molecular and functional properties found in other species...
May 14, 2018: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/29772266/pten-pdz-binding-domain-suppresses-mammary-carcinogenesis-in-the-mmtv-pymt-breast-cancer-model
#12
Mingfei Yan, Yubing Wang, Chi Wai Wong, Penelope Mei-Yu Or, Kin Lok Wong, Lisha Li, Alexander M Many, Hong Guan, Ui Soon Khoo, Andrew M Chan
Phosphatase and tension homolog (PTEN) is a potent tumor suppressor that possesses a PDZ-binding domain (PDZ-BD) at the end of its carboxyl terminus, whose functions during tumorigenesis remains unclear. Here, we crossed a mouse strain with germline deletion of PTEN PDZ-BD with MMTV-PyMT breast cancer model, and found that knockout (KO) mice display normal development of mammary glands, but have both increased breast tumorigenicity and lung metastasis. Orthotopic allograft experiments suggest the loss of PTEN PDZ-BD in breast cancer cells rather than in tumor microenvironment plays a prominent role in increasing tumor burden...
May 14, 2018: Cancer Letters
https://www.readbyqxmd.com/read/29772179/estimation-of-copolymer-water-interfacial-tensions-using-pendant-drop-tensiometry
#13
Florent Jasinski, Amjad Alkhater, Stuart C Thickett, Richard H Brinkhuis, Per B Zetterlund
Copolymer/water interfacial tensions of statistical copolymers of styrene / n-butyl acrylate were estimated by pendant drop tensiometry using an "inverse" configuration according to which a drop of water was formed in toluene/copolymer solutions. The study first involved the precise measurement of copolymer solutions density using pycnometry. Subsequently, interfacial tensions of copolymer solutions against water were plotted as a function of copolymer concentration in toluene. Several methods were explored to fit the experimental data and obtain estimates of copolymer/water interfacial tensions at 100 % copolymer concentration in toluene by extrapolation...
May 17, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29771988/variables-associated-with-sleep-quality-in-chronic-tension-type-headache-a-cross-sectional-and-longitudinal-design
#14
Elena Benito-González, Maria Palacios-Ceña, Juan J Fernández-Muñoz, Matteo Castaldo, Kelun Wang, Antonella Catena, Lars Arendt-Nielsen, César Fernández-de-Las-Peñas
OBJECTIVE: To investigate variables associated at baseline (cross-sectional design) and at one year (longitudinal design) with the quality of sleep in chronic tension-type headache (CTTH). METHODS: One hundred and eighty (n = 180) and 135 individuals with CTTH participated in the cross-sectional and longitudinal design respectively. Clinical features were collected with a 4-weeks headache diary at baseline and one-year follow-up. Sleep quality was assessed at baseline and 1-year follow-up with the Pittsburgh Sleep Quality Index...
2018: PloS One
https://www.readbyqxmd.com/read/29771915/inactivation-of-bpsl1039-1040-atp-binding-cassette-transporter-reduces-intracellular-survival-in-macrophages-biofilm-formation-and-virulence-in-the-murine-model-of-burkholderia-pseudomallei-infection
#15
Peechanika Pinweha, Pornpan Pumirat, Jon Cuccui, Niramol Jitprasutwit, Veerachat Muangsombut, Varintip Srinon, Usa Boonyuen, Parameth Thiennimitr, Paiboon Vattanaviboon, Felipe Cia, Sam Willcocks, Gregory J Bancroft, Brendan W Wren, Sunee Korbsrisate
Burkholderia pseudomallei, a gram-negative intracellular bacillus, is the causative agent of a tropical infectious disease called melioidosis. Bacterial ATP-binding cassette (ABC) transporters import and export a variety of molecules across bacterial cell membranes. At present, their significance in B. pseudomallei pathogenesis is poorly understood. We report here characterization of the BPSL1039-1040 ABC transporter. B. pseudomallei cultured in M9 medium supplemented with nitrate, demonstrated that BPSL1039-1040 is involved in nitrate transport for B...
2018: PloS One
https://www.readbyqxmd.com/read/29771610/tracheal-acid-or-surfactant-instillation-raises-alveolar-surface-tension
#16
Tam L Nguyen, Carrie E Perlman
Whether alveolar liquid surface tension, T, is elevated in the acute respiratory distress syndrome (ARDS) has not been demonstrated in situ in the lungs. Neither is it known how exogenous surfactant, which has failed to treat ARDS, affects in situ T. We aim to determine T in an acid-aspiration ARDS model before and after exogenous surfactant administration. In isolated rat lungs, we combine servo-nulling pressure measurement and confocal microscopy to determine alveolar liquid T according to the Laplace relation...
May 17, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29770879/no-difference-in-the-graft-shift-between-a-round-and-a-rounded-rectangular-femoral-tunnel-for-anterior-cruciate-ligament-reconstruction-an-experimental-study
#17
Yasushi Takata, Junsuke Nakase, Takeshi Oshima, Kengo Shimozaki, Kazuki Asai, Hiroyuki Tsuchiya
INTRODUCTION: We developed a novel technique of creating a rounded rectangular femoral bone tunnel for anatomical, single-bundle, autologous hamstring tendon anterior cruciate ligament (ACL) reconstruction. Although this tunnel has many advantages, its non-circular shape has raised concerns regarding excessive graft shift within the bone tunnel. This study aimed to compare the graft shift between round and rounded rectangular tunnels using a graft diameter tester for simulating the femoral bone tunnel...
May 16, 2018: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/29770544/two-approaches-one-goal-how-mental-health-registered-nurses-perceive-their-role-and-the-role-of-peer-support-workers-in-facilitating-consumer-decision-making
#18
Michelle Cleary, Toby Raeburn, Sancia West, Phil Escott, Violeta Lopez
Recovery-oriented principles underpin modern-day mental health care and are enhanced by consumer participation in decision-making. Understanding how consumer participation can be maximized is central to promoting recovery-oriented care. This study explored the key strategies used by mental health registered nurses and perceived by nurses to be used by peer support workers in facilitating consumer decision-making to determine similarities, differences, and possible tensions. A qualitative descriptive approach using semi-structured interviews was conducted with nine nurses employed in mental health care...
May 16, 2018: International Journal of Mental Health Nursing
https://www.readbyqxmd.com/read/29770193/hyperbaric-oxygen-therapy-as-adjunctive-strategy-in-treatment-of-glioblastoma-multiforme
#19
REVIEW
Lei Huang, Warren Boling, John H Zhang
Glioblastoma multiforme (GBM) is the most common type of malignant intracranial tumor in adults. Tumor tissue hypoxia, high mitotic rate, and rapid tumor spread account for its poor prognosis. Hyperbaric oxygen therapy (HBOT) may improve the sensitivity of radio-chemotherapy by increasing oxygen tension within the hypoxic regions of the neoplastic tissue. This review summarizes the research of HBOT applications within the context of experimental and clinical GBM. Limited clinical trials and preclinical studies suggest that radiotherapy immediately after HBOT enhances the effects of radiotherapy in some aspects...
January 2018: Medical Gas Research
https://www.readbyqxmd.com/read/29769233/muscle-tensions-merge-to-cause-a-dna-replication-crisis
#20
Daniel Brayson, Chin Yee Ho, Catherine M Shanahan
In this issue, Wang et al. (2018. J. Cell Biol. https://doi.org/10.1083/jcb.201708137) show that disruption to different mechanical domains of muscle cells converge at the linker of nucleoskeleton to cytoskeleton complex to affect DNA endoreplication potentially via barrier to autointegration factor-mediated epigenetic mechanisms.
May 16, 2018: Journal of Cell Biology
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