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https://www.readbyqxmd.com/read/29161343/distinct-reorganization-of-collagen-architecture-in-lipopolysaccharide-mediated-premature-cervical-remodeling
#1
Shanmugasundaram Nallasamy, Meredith Akins, Breanna Tetreault, Kate Luby-Phelps, Mala Mahendroo
Previous work has identified divergent mechanisms by which cervical remodeling is achieved in preterm birth (PTB) induced by hormone withdrawal (mifepristone) or lipopolysaccharide (LPS). Our current study aims to document how collagen architecture is modified to achieve premature cervical remodeling in mice treated with LPS as a model of infection induced inflammation. Cervices were collected on gestation day (d) 15 from mice with premature cervical ripening induced by LPS and compared to d15 and d18 controls as well as a hormone withdrawal preterm birth model...
November 17, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/29161320/in-vivo-effects-of-intraocular-and-intracranial-pressures-on-the-lamina-cribrosa-microstructure
#2
Bo Wang, Huong Tran, Matthew A Smith, Tigran Kostanyan, Samantha E Schmitt, Richard A Bilonick, Ning-Jiun Jan, Larry Kagemann, Elizabeth C Tyler-Kabara, Hiroshi Ishikawa, Joel S Schuman, Ian A Sigal, Gadi Wollstein
There is increasing clinical evidence that the eye is not only affected by intraocular pressure (IOP), but also by intracranial pressure (ICP). Both pressures meet at the optic nerve head of the eye, specifically the lamina cribrosa (LC). The LC is a collagenous meshwork through which all retinal ganglion cell axons pass on their way to the brain. Distortion of the LC causes a biological cascade leading to neuropathy and impaired vision in situations such as glaucoma and idiopathic intracranial hypertension...
2017: PloS One
https://www.readbyqxmd.com/read/29161021/recent-advances-in-solid-nano-pores-channel-analysis
#3
Zi Long, Shenshan Zhan, Pengcheng Gao, Yongqian Wang, Xiaoding Lou, Fan Xia
Inspired by the natural phenomenon that various types of transmembrane pores and ion channels in the range of 1-100 nm are found in each biological cell, playing crucial roles in various significant physiological activities such as maintaining cell osmotic balance and stabilizing cell volume, different biomimetic nanodevices (nano-pore/channel) with various characteristics have emerged as an attractive and powerful platform, and have been used for a wide range of applications. As the key components of any nano-pore/channel-based applications, the nano-pore/channel can be broadly sorted into two types, biological and solid state...
November 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29160936/liquid-photonic-crystals-for-mesopore-detection
#4
Biting Zhu, Qianqian Fu, Ke Chen, Jianping Ge
Nitrogen adsorption-desorption for mesopore characterization requires the using of expensive instrument, time-consuming process and consumption of liquid nitrogen. Here, a new method was developed to measure the pore parameters through mixing of mesoporous substance with supersaturated SiO2 colloidal solution at different temperatures, followed by quick measurement of reflection changes of the precipitated liquid photonic crystals. Pore volumes and diameters of mesoporous silica were measured according to the positive correlation between unit mass reflection change (Δλ/m) and pore volume (V), and the negative correlation between average absorption temperature (T) and pore diameter (D)...
November 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29160802/modification-of-the-selectivity-properties-of-tubular-ceramic-membranes-after-alkaline-treatment
#5
Patrick Dutournié, Lionel Limousy, Jérôme Anquetil, Sébastien Déon
This work focuses on the selectivity modification of ceramic membranes after a mild alkaline treatment. Filtration of pure salt-water solutions was carried out with commercial titania membranes before and after the treatment. After treatment, the rejection of NaF significantly decreased, while the rejection of NaCl and NaBr increased. Additionally, NaI and Na₂SO₄ remained close to zero. Pore size and electrical charge being almost unchanged, only significant modifications in the dielectric effects can explain this modification of selectivity...
November 21, 2017: Membranes
https://www.readbyqxmd.com/read/29160241/evidence-for-confinement-induced-phase-separation-in-ethanol-water-mixture-a-positron-annihilation-study
#6
Muthulakshmi T, Dhanadeep Dutta, Priya Maheshwari, P K Pujari
We report an experimental evidence for the phase separation of ethanol-water mixture confined in mesoporous silica with different pore size using positron annihilation lifetime spectroscopy (PALS). A bulk-like liquid in the core of the pore and a distinct interfacial region near the pore surface have been identified based on ortho-positronium lifetime components. The lifetime corresponding to the core liquid shows similar behavior as the bulk liquid mixture while the interfacial lifetime shows an abrupt rise within a particular range of ethanol concentration depending on the pore size...
November 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29159723/anatomical-and-diffusional-determinants-inside-leaves-explain-the-difference-in-photosynthetic-capacity-between-cypripedium-and-paphiopedilum-orchidaceae
#7
Zhong-Hui Yang, Wei Huang, Qiu-Yun Yang, Wei Chang, Shi-Bao Zhang
Comparing with other angiosperms, most members within the family Orchidaceae have lower photosynthetic capacities. However, the underlying mechanisms remain unclear. Cypripedium and Paphiopedilum are closely related phylogenetically in Orchidaceae, but their photosynthetic performances are different. We explored the roles of internal anatomy and diffusional conductance in determining photosynthesis in three Cypripedium and three Paphiopedilum species, and quantitatively analyzed their diffusional and biochemical limitations to photosynthesis...
November 20, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/29159362/from-helix-to-helical-pores-solid-state-crystalline-conversions-triggered-by-gas-solid-reactions
#8
Jie Liu, Jia-Jia Du, Yuan Wu, Yi-Fang Zhao, Xiao-Ping Zhou, Dan Li
Two one-dimensional (1D) helical coordination polymers, CuBIm-Cl and CuBIm-Br (BIm = 1,2-bis((5H-imidazol-4-yl)-methylene)hydrazine), are constructed from Cu(2+) ions, halides and mono-deprotonated BIm. Solid-state crystalline conversions of CuBIm-Cl and CuBIm-Br to a gyroidal metal-organic framework (MOF) STU-3 which is composed of Cu ions and Bim ligands are observed through a gas-solid reaction, where the gas is methylamine.
November 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29158962/sediment-tolerance-mechanisms-identified-in-sponges-using-advanced-imaging-techniques
#9
Brian W Strehlow, Mari-Carmen Pineda, Alan Duckworth, Gary A Kendrick, Michael Renton, Muhammad Azmi Abdul Wahab, Nicole S Webster, Peta L Clode
Terrestrial runoff, resuspension events and dredging can affect filter-feeding sponges by elevating the concentration of suspended sediments, reducing light intensity, and smothering sponges with sediments. To investigate how sponges respond to pressures associated with increased sediment loads, the abundant and widely distributed Indo-Pacific species Ianthella basta was exposed to elevated suspended sediment concentrations, sediment deposition, and light attenuation for 48 h (acute exposure) and 4 weeks (chronic exposure)...
2017: PeerJ
https://www.readbyqxmd.com/read/29158540/calcium-binding-and-voltage-gating-in-cx46-hemichannels
#10
Bernardo I Pinto, Amaury Pupo, Isaac E García, Karel Mena-Ulecia, Agustín D Martínez, Ramón Latorre, Carlos Gonzalez
The opening of connexin (Cx) hemichannels in the membrane is tightly regulated by calcium (Ca(2+)) and membrane voltage. Electrophysiological and atomic force microscopy experiments indicate that Ca(2+) stabilizes the hemichannel closed state. However, structural data show that Ca(2+) binding induces an electrostatic seal preventing ion transport without significant structural rearrangements. In agreement with the closed-state stabilization hypothesis, we found that the apparent Ca(2+) sensitivity is increased as the voltage is made more negative...
November 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29158521/characterization-and-separation-performance-of-a-novel-polyethersulfone-membrane-blended-with-acacia-gum
#11
Yehia Manawi, Viktor Kochkodan, Ebrahim Mahmoudi, Daniel J Johnson, Abdul Wahab Mohammad, Muataz Ali Atieh
Novel polyethersulfone (PES) membranes blended with 0.1-3.0 wt. % of Acacia gum (AG) as a pore-former and antifouling agent were fabricated using phase inversion technique. The effect of AG on the pore-size, porosity, surface morphology, surface charge, hydrophilicity, and mechanical properties of PES/AG membranes was studied by scanning electron microscopy (SEM), Raman spectroscopy, contact angle and zeta potential measurements. The antifouling -properties of PES/AG membranes were evaluated using Escherichia coli bacteria and bovine serum albumine (BSA)...
November 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29158256/heart-failure-induced-activation-of-phospholipase-ipla2%C3%AE-%C3%A2-generates-hydroxyeicosatetraenoic-acids-opening-the-mitochondrial-permeability-transition-pore
#12
Sung Ho Moon, Xinping Liu, Ari M Cedars, Kui Yang, Michael A Kiebish, Susan M Joseph, John Kelley, Christopher M Jenkins, Richard W Gross
Congestive heart failure typically arises from cardiac myocyte necrosis/apoptosis, associated with the pathological opening of the mitochondrial permeability transition pore (mPTP). mPTP opening decreases the mitochondrial membrane potential leading to the activation of Ca(2+)-independent phospholipase A2γ (iPLA2γ) and the production of downstream toxic metabolites. However, the array of enzymatic mediators and the exact chemical mechanisms responsible for modulating myocardial mPTP opening remain unclear...
November 20, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29157964/new-insights-on-the-influence-of-manufacturing-conditions-and-molecular-weight-on-phase-separated-films-intended-for-controlled-release
#13
Helene Andersson Moore, Mariagrazia Marucci, Linda Härdelin, Johan Hjärtstam, Mats Stading, Christian von Corswant, Anette Larsson
he aim of this work was to investigate how manufacturing conditions influence phase-separated films of ethyl cellulose (EC) and hydroxypropyl cellulose (HPC) with different molecular weights of HPC. Two HPC grades, SSL and M, with weight average molecular weights (Mw) of 30×10(3)g/mol and 365×10(3)g/mol, respectively, were combined with EC 10 cps (70:30w/w EC/HPC) and spray-coated from ethanol solutions onto a rotating drum under well-controlled process conditions. Generally, a low spray rate resulted in a more rapid film drying process and, consequently, in smaller HPC-rich domains in the phase-separated film structure...
November 17, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29157868/selective-observation-of-charge-storing-ions-in-supercapacitor-electrode-materials
#14
Alexander C Forse, John M Griffin, Clare P Grey
Nuclear magnetic resonance (NMR) spectroscopy has emerged as a useful technique for probing the structure and dynamics of the electrode-electrolyte interface in supercapacitors, as ions inside the pores of the carbon electrodes can be studied separately from bulk electrolyte. However, in some cases spectral resolution can limit the information that can be obtained. In this study we address this issue by showing how cross polarisation (CP) NMR experiments can be used to selectively observe the in-pore ions in supercapacitor electrode materials...
November 4, 2017: Solid State Nuclear Magnetic Resonance
https://www.readbyqxmd.com/read/29156641/facile-control-of-the-porous-structure-of-larch-derived-mesoporous-carbons-via-self-assembly-for-supercapacitors
#15
Xin Zhao, Wei Li, Honglei Chen, Shoujuan Wang, Fangong Kong, Shouxin Liu
Mesoporous carbons have been successfully synthesized via self-assembly using larch-based resins as precursors and triblock copolymers as soft templates. The porous structure of mesoporous carbons can be tailored by adjusting the ratio of hydrophilic/hydrophobic (EO/PO) units owing to interfacial curvature. Interestingly, the porous structures show a distinct change from vortex-like to worm-like pores, to stripe-like pores, and to ordered two-dimensional hexagonal pores as the ratio of hydrophilic/hydrophobic units increases, indicating the significant effect of EO/PO ratio on the porous structure...
November 20, 2017: Materials
https://www.readbyqxmd.com/read/29156592/activation-of-trek-1-but-not-trek-2-channel-by-mood-stabilizers
#16
Eun-Jin Kim, Dong Kun Lee, Seong-Geun Hong, Jaehee Han, Dawon Kang
Earlier studies have demonstrated that the tandem pore domain weak inward rectifying K⁺ channel (TWIK)-related K⁺ (TREK)-1 channel is inhibited by antidepressants and is associated with major depression. However, little is known about the effect of mood stabilizers that are commonly used for treatment of bipolar disorder on TREK channels, members of the two-pore domain K⁺ (K2P) channel family. This study sought to investigate the effect of mood stabilizers on TREK-1 and TREK-2 channels. HEK-293A cells were transfected with human TREK-1 or TREK-2 DNA...
November 19, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29156380/structure-based-design-of-herg-neutral-antihypertensive-oxazalone-and-imidazolone-derivatives
#17
Busecan Aksoydan, Isik Kantarcioglu, Ismail Erol, Ramin Ekhteiari Salmas, Serdar Durdagi
Angiotensin II receptor type 1 (AT1) antagonists are the most recent drug class against hypertension. Recently first crystal structure of AT1 receptor is deposited to the protein data bank (PDB ID: 4YAY). In this work, several molecular screening methods such as molecular docking and de novo design studies were performed and it is found that oxazolone and imidazolone derivatives reveal similar/better interaction energy profiles compared to the FDA approved sartan molecules at the binding site of the AT1 receptor...
October 18, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/29156352/a-homogenization-approach-for-the-effective-drained-viscoelastic-properties-of-2d-porous-media-and-an-application-for-cortical-bone
#18
Sy-Tuan Nguyen, Mai-Ba Vu, Minh-Ngoc Vu, Quy-Dong To
Closed-form solutions for the effective rheological properties of a 2D viscoelastic drained porous medium made of a Generalized Maxwell viscoelastic matrix and pore inclusions are developed and applied for cortical bone. The in-plane (transverse) effective viscoelastic bulk and shear moduli of the Generalized Maxwell rheology of the homogenized medium are expressed as functions of the porosity and the viscoelastic properties of the solid phase. When deriving these functions, the classical inverse Laplace-Carson transformation technique is avoided, due to its complexity, by considering the short and long term approximations...
November 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29156131/development-and-performance-characterization-of-a-polyimine-covalent-organic-framework-thin-film-composite-nanofiltration-membrane
#19
Lauren Valentino, Michio Matsumoto, William R Dichtel, Benito J Marinas
Two-dimensional covalent organic frameworks (COFs) were used to create the first asymmetric, thin-film composite (TFC) nanofiltration (NF) membrane with a COF active layer. NF membrane active layers of polyimine COF were synthesized via the interfacial polymerization (IP) of terephthalaldehyde and tris(4-aminophenyl)benzene monomers on top of a polyethersulfone (PES) ultrafiltration membrane support. Rutherford backscattering spectrometry and Fourier transform infrared spectroscopy analyses confirmed the presence of an imine-linked film with a thickness of ~10 nm that was formed reproducibly...
November 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29156127/gas-separation-through-bilayer-silica-the-thinnest-possible-silica-membrane
#20
Bowen Yao, Salvatore Mandrà, John O Curry, Shamil Shaikhutdinov, Hans-Joachim Freund, Joshua Schrier
Membrane-based gas separation processes can address key challenges in energy and environment, but for many applications the permeance and selectivity of bulk membranes is insufficient for economical use. Theory and experiment indicate that permeance and selectivity can be increased by using two-dimensional materials with subnanometer pores as membranes. Motivated by experiments showing selective permeation of H2/CO mixtures through amorphous silica bilayers, here we perform a theoretical study of gas separation through silica bilayers...
November 20, 2017: ACS Applied Materials & Interfaces
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