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https://www.readbyqxmd.com/read/27926945/ear-structures-of-the-naked-mole-rat-heterocephalus-glaber-and-its-relatives-rodentia-bathyergidae
#1
Matthew J Mason, Hannah L Cornwall, Ewan St J Smith
Although increasingly popular as a laboratory species, very little is known about the peripheral auditory system of the naked mole-rat, Heterocephalus glaber. In this study, middle and inner ears of naked mole-rats of a range of ages were examined using micro-computed tomography and dissection. The ears of five other bathyergid species (Bathyergus suillus, Cryptomys hottentotus, Fukomys micklemi, Georychus capensis and Heliophobius argenteocinereus) were examined for comparative purposes. The middle ears of bathyergids show features commonly found in other members of the Ctenohystrica rodent clade, including a fused malleus and incus, a synovial stapedio-vestibular articulation and the loss of the stapedius muscle...
2016: PloS One
https://www.readbyqxmd.com/read/27926839/circular-dichroism-spectroscopy-of-collagen-fibrillogenesis-a-new-use-for-an-old-technique
#2
Kathryn E Drzewiecki, Daniel R Grisham, Avanish S Parmar, Vikas Nanda, David I Shreiber
Type-I collagen assembles in a stepwise, hierarchic fashion from the folding of the triple helix to the assembly of fibrils into fibers. The mature assembled fibers are crucial for tissue structure and mechanics, cell interactions, and other functions in vivo. Although triple helix folding can be followed with the use of optical methods such as circular dichroism (CD) spectroscopy, fibrillogenesis is typically measured by alternative methods such as turbidity, rheology, and microscopy. Together, these approaches allow for investigation of the mechanical properties and architectures of collagen-based scaffolds and excised tissues...
December 6, 2016: Biophysical Journal
https://www.readbyqxmd.com/read/27924309/engineering-the-dynamic-properties-of-protein-networks-through-sequence-variation
#3
Lawrence J Dooling, David A Tirrell
The dynamic behavior of macromolecular networks dominates the mechanical properties of soft materials and influences biological processes at multiple length scales. In hydrogels prepared from self-assembling artificial proteins, stress relaxation and energy dissipation arise from the transient character of physical network junctions. Here we show that subtle changes in sequence can be used to program the relaxation behavior of end-linked networks of engineered coiled-coil proteins. Single-site substitutions in the coiled-coil domains caused shifts in relaxation time over 5 orders of magnitude as demonstrated by dynamic oscillatory shear rheometry and stress relaxation measurements...
November 23, 2016: ACS Central Science
https://www.readbyqxmd.com/read/27923754/successful-coil-embolization-of-pediatric-carotid-cavernous-fistula-due-to-ruptured-post-traumatic-giant-internal-carotid-artery-aneurysm
#4
Daisuke Wajima, Ichiro Nakagawa, Hun Soo Park, Shohei Yokoyama, Takeshi Wada, Kimihiko Kichikawa, Hiroyuki Nakase
BACKGROUND: The goal of the treatment of direct carotid cavernous fistula (CCF) is to occlude the arteriovenous shunt and to preserve the patency of the concerned internal carotid artery (ICA). However, for the ipsilateral post-traumatic fragile cerebrum, coil embolization plus parent artery occlusion for the high flow direct CCF would be better for the prevention of hyper-perfusion syndrome and the intracranial hemorrhage. We experienced such a case and managed it successfully. CASE DESCRIPTION: A 6-year-old boy was suffered from severe head trauma caused by being hit by a car...
December 3, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27923745/retrospective-correction-of-bias-in-diffusion-tensor-imaging-arising-from-coil-combination-mode
#5
Ken Sakaie, Mark Lowe
PURPOSE: To quantify and retrospectively correct for systematic differences in diffusion tensor imaging (DTI) measurements due to differences in coil combination mode. BACKGROUND: Multi-channel coils are now standard among MRI systems. There are several options for combining signal from multiple coils during image reconstruction, including sum-of-squares (SOS) and adaptive combine (AC). This contribution examines the bias between SOS- and AC-derived measures of tissue microstructure and a strategy for limiting that bias...
December 3, 2016: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/27923744/simultaneous-measurement-of-total-water-content-and-myelin-water-fraction-in-brain-at-3t-using-a-t2-relaxation-based-method
#6
Sandra M Meyers, Shannon H Kolind, Alex L MacKay
PURPOSE: This work demonstrates the in vivo application of a T2 relaxation based total water content (TWC) measurement technique at 3T in healthy human brain, and evaluates accuracy using simulations that model brain tissue. The benefit of using T2 relaxation is that it provides simultaneous measurements of myelin water fraction, which correlates to myelin content. METHODS: T2 relaxation data was collected from 10 healthy human subjects with a gradient and spin echo (GRASE) sequence, along with inversion recovery for T1 mapping...
December 3, 2016: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/27921382/core-shell-silk-hydrogels-with-spatially-tuned-conformations-as-drug-delivery-system
#7
Le-Ping Yan, Joaquim M Oliveira, Ana L Oliveira, Rui L Reis
Hydrogels of spatially controlled physicochemical properties are appealing platforms for tissue engineering and drug delivery. In this study, core-shell silk fibroin (SF) hydrogels of spatially controlled conformation were developed. The core-shell structure in the hydrogels was formed by means of soaking the preformed (enzymatically crosslinked) random coil SF hydrogels in methanol. When increasing the methanol treatment time from 1 to 10 min, the thickness of the shell layer can be tuned from about 200 to about 850 μm as measured in wet status...
December 5, 2016: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/27921230/upregulation-of-rock2-in-gastric-cancer-cell-promotes-tumor-cell-proliferation-metastasis-and-invasion
#8
Manhua Li, Jing Ke, Qiuhong Wang, Hongyan Qian, Lei Yang, Xunlei Zhang, Jinzhang Xiao, Haifang Ding, Xiaohang Shan, Qingqing Liu, Ying Xiao, Bojun Bao, Hua Huang
Rho-associated coiled-coil-containing protein kinase 2 (ROCK2) has been known as an effector for the small GTPase Rho and plays an important role in tumor progression and metastasis. However, the effect of ROCK2 in gastric cancer (GC) has not been identified. This study showed that ROCK2 expression significantly increased in clinical GC tissues compared with adjacent non-cancer tissues. Immunohistochemistrical analysis showed that high expression of ROCK2 was correlated with tumor grade, tumor-node-metastasis stage, infiltration depth, lymph node invasion and Ki-67, and predicted poor prognosis in 135 gastric cancer specimens...
December 5, 2016: Clinical and Experimental Medicine
https://www.readbyqxmd.com/read/27921152/proximal-occlusion-of-medium-sized-vessels-with-the-penumbra-occlusion-device-a-study-of-safety-and-efficacy
#9
E Jambon, F Petitpierre, V Brizzi, V Dubuisson, Y Le Bras, N Grenier, F Cornelis
PURPOSE: To retrospectively investigate the safety and efficacy of hybrid proximal coiling of various medium-sized vessels (4 to 8 mm) using the Penumbra Occlusion Device (POD). MATERIALS AND METHODS: From October 2014 to February 2016, 37 proximal embolizations were performed with PODs in 36 patients (mean age: 50.8, range: 10-86; 29 male, 7 female). Vessel occlusions were achieved under fluoroscopic guidance using a 2.7 French microcatheter. Among the 36 vessels targeted, 16 were splenic arteries, 11 renal arteries, 4 mesenteric arteries, 3 arteriovenous fistulae, 1 iliac artery, and 1 gonadal vein...
December 5, 2016: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/27919701/evaluation-of-the-neurotoxic-effects-of-chronic-embryonic-exposure-with-inorganic-mercury-on-motor-and-anxiety-like-responses-in-zebrafish-danio-rerio-larvae
#10
Noraini Abu Bakar, Nurul Syafida Asma' Mohd Sata, Nurul Farhana Ramlan, Wan Norhamidah Wan Ibrahim, Syaizwan Zahmir Zulkifli, Che Azurahanim Che Abdullah, Mohammad Noor Amal Azmai
Chronic exposure to mercury (Hg) can lead to cumulative impairments in motor and cognitive functions including alteration in anxiety responses. Although several risk factors have been identified in recent year, little is known about the environmental factors that either due exposure toward low level of inorganic mercury that may led to the developmental disorders. The present study investigated the effects of embryonic exposure of mercury chloride on motor function and anxiety-like behavior. The embryo exposed to 6 different concentrations of HgCl2 (7...
December 2, 2016: Neurotoxicology and Teratology
https://www.readbyqxmd.com/read/27919690/comparative-analysis-of-different-xanthan-samples-by-atomic-force-microscopy
#11
Julia Teckentrup, Orooba Al-Hammood, Tim Steffens, Hanna Bednarz, Volker Walhorn, Karsten Niehaus, Dario Anselmetti
The polysaccharide xanthan which is produced by the γ-proteobacterium Xanthomonas campestris is used as a food thickening agent and rheologic modifier in numerous food, cosmetics and technical applications. Its great commercial importance stimulated biotechnological approaches to optimize the xanthan production. By targeted genetic modification the metabolism of Xanthomonas can be modified in such a way that the xanthan production efficiency and/or the shear-thickening potency is optimized. Using atomic force microscopy (AFM) the secondary structure of single xanthan polymers produced by the wild type Xanthomonas campestris B100 and several genetically modified variations were analyzed...
December 2, 2016: Journal of Biotechnology
https://www.readbyqxmd.com/read/27919290/ccdc88a-a-prognostic-factor-for-human-pancreatic-cancers-promotes-the-motility-and-invasiveness-of-pancreatic-cancer-cells
#12
Aki Tanouchi, Keisuke Taniuchi, Mutsuo Furihata, Seiji Naganuma, Ken Dabanaka, Masashi Kimura, Ryohei Watanabe, Takuhiro Kohsaki, Takahiro Shimizu, Motoaki Saito, Kazuhiro Hanazaki, Toshiji Saibara
BACKGROUND: Coiled-Coil Domain Containing 88A (CCDC88A) was identified as a substrate of the serine/threonine kinase Akt that is capable of binding to the actin cytoskeleton. The aim of this study was to investigate the potential role of CCDC88A in the migration and invasiveness of pancreatic ductal adenocarcinoma (PDAC) cells. METHODS: Immunohistochemistry was performed to determine whether high CCDC88A expression in human PDAC tissues is correlated with poor prognosis...
December 5, 2016: Journal of Experimental & Clinical Cancer Research: CR
https://www.readbyqxmd.com/read/27918448/secondary-structure-adopted-by-the-gly-gly-x-repetitive-regions-of-dragline-spider-silk
#13
Geoffrey M Gray, Arjan van der Vaart, Chengchen Guo, Justin Jones, David Onofrei, Brian R Cherry, Randolph V Lewis, Jeffery L Yarger, Gregory P Holland
Solid-state NMR and molecular dynamics (MD) simulations are presented to help elucidate the molecular secondary structure of poly(Gly-Gly-X), which is one of the most common structural repetitive motifs found in orb-weaving dragline spider silk proteins. The combination of NMR and computational experiments provides insight into the molecular secondary structure of poly(Gly-Gly-X) segments and provides further support that these regions are disordered and primarily non-β-sheet. Furthermore, the combination of NMR and MD simulations illustrate the possibility for several secondary structural elements in the poly(Gly-Gly-X) regions of dragline silks, including β-turns, 310-helicies, and coil structures with a negligible population of α-helix observed...
December 2, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27918139/an-observational-study-to-assess-brain-mri-change-and-disease-progression-in-multiple-sclerosis-clinical-practice-the-ms-mrius-study
#14
Robert Zivadinov, Nasreen Khan, Jennie Medin, Pia Christoffersen, Jennifer Price, Jonathan R Korn, Ian Bonzani, Michael G Dwyer, Niels Bergsland, Ellen Carl, Diego Silva, Bianca Weinstock-Guttman
BACKGROUND & PURPOSE: To describe methodology, interim baseline, and longitudinal magnetic resonance imaging (MRI) acquisition parameter characteristics of the multiple sclerosis clinical outcome and MRI in the United States (MS-MRIUS). MATERIAL & METHODS: The MS-MRIUS is an ongoing longitudinal and retrospective study of MS patients on fingolimod. Clinical and brain MRI image scan data were collected from 600 patients across 33 MS centers in the United States. MRI brain outcomes included change in whole-brain volume, lateral ventricle volume, T2- and T1-lesion volumes, and new/enlarging T2 and gadolinium-enhancing lesions...
December 5, 2016: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/27917825/molecular-symmetry-constrained-systematic-search-approach-to-structure-solution-of-the-coiled-coil-srgap2-f-barx-domain
#15
Michael Sporny, Julia Guez-Haddad, David G Waterman, Michail N Isupov, Yarden Opatowsky
SRGAP2 (Slit-Robo GTPase-activating protein 2) is a cytoplasmic protein found to be involved in neuronal branching, restriction of neuronal migration and restriction of the length and density of dendritic postsynaptic spines. The extended F-BAR (F-BARx) domain of SRGAP2 generates membrane protrusions when expressed in COS-7 cells, while most F-BARs induce the opposite effect: membrane invaginations. As a first step to understand this discrepancy, the F-BARx domain of SRGAP2 was isolated and crystallized after co-expression with the carboxy domains of the protein...
December 1, 2016: Acta Crystallographica. Section D, Structural Biology
https://www.readbyqxmd.com/read/27917528/the-ultimate-signal-to-noise-ratio-in-realistic-body-models
#16
Bastien Guérin, Jorge F Villena, Athanasios G Polimeridis, Elfar Adalsteinsson, Luca Daniel, Jacob K White, Lawrence L Wald
PURPOSE: We compute the ultimate signal-to-noise ratio (uSNR) and G-factor (uGF) in a realistic head model from 0.5 to 21 Tesla. METHODS: We excite the head model and a uniform sphere with a large number of electric and magnetic dipoles placed at 3 cm from the object. The resulting electromagnetic fields are computed using an ultrafast volume integral solver, which are used as basis functions for the uSNR and uGF computations. RESULTS: Our generalized uSNR calculation shows good convergence in the sphere and the head and is in close agreement with the dyadic Green's function approach in the uniform sphere...
December 4, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27917520/sensitive-enhancement-of-vessel-wall-imaging-with-an-endoesophageal-wireless-amplified-nmr-detector-wand
#17
Xianchun Zeng, Mladen Barbic, Liangliang Chen, Chunqi Qian
PURPOSE: To improve the imaging quality of vessel walls with an endoesophageal Wireless Amplified NMR Detector (WAND). METHODS: A cylindrically shaped double-frequency resonator has been constructed with a single metal wire that is self-connected by a pair of nonlinear capacitors. The double-frequency resonator can convert wirelessly provided pumping power into amplified MR signals. This compact design makes the detector easily insertable into a rodent esophagus...
December 4, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27917311/rock-inhibition-promotes-attachment-proliferation-and-wound-closure-in-human-embryonic-stem-cell-derived-retinal-pigmented-epithelium
#18
Roxanne H Croze, William J Thi, Dennis O Clegg
PURPOSE: Nonexudative (dry) age-related macular degeneration (AMD), a leading cause of blindness in the elderly, is associated with the loss of retinal pigmented epithelium (RPE) cells and the development of geographic atrophy, which are areas devoid of RPE cells and photoreceptors. One possible treatment option would be to stimulate RPE attachment and proliferation to replace dying/dysfunctional RPE and bring about wound repair. Clinical trials are underway testing injections of RPE cells derived from pluripotent stem cells to determine their safety and efficacy in treating AMD...
November 2016: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/27916658/referenceless-one-dimensional-nyquist-ghost-correction-in-multicoil-single-shot-spatiotemporally-encoded-mri
#19
Ying Chen, Yupeng Liao, Lisha Yuan, Hui Liu, Seong Dae Yun, Nadim Joni Shah, Zhong Chen, Jianhui Zhong
Single-shot spatiotemporally encoded (SPEN) MRI is a novel fast imaging method capable of retaining the time efficiency of single-shot echo planar imaging (EPI) but with distortion artifacts significantly reduced. Akin to EPI, the phase inconsistencies between mismatched even and odd echoes also result in the so-called Nyquist ghosts. However, the characteristic of the SPEN signals provides the possibility of obtaining ghost-free images directly from even and odd echoes respectively, without acquiring additional reference scans...
December 1, 2016: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/27915269/effect-of-ph-on-the-interaction-of-volatile-compounds-with-the-myofibrillar-proteins-of-duck-meat
#20
Q L Yang, X W Lou, Y Wang, D D Pan, Y Y Sun, J X Cao
In order to clarify the influence of curing agents on the flavor of duck, the effect of pH on the surface hydrophobicity, secondary structures, and adsorption capacity of myofibrillar proteins to alcohols, aldehydes, ketones, and esters was assessed using Raman spectroscopy, gas chromatography-mass spectrometer, and other methodologies. The hydrophobicity decreased as pH increased from 5.0 to 8.0; β-turn turned into α-helix and random coil as pH increased from 5.0 to 7.0, while α-helix and random coil turned into β-sheet and β-turn as pH increased from 7...
December 3, 2016: Poultry Science
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