scholarly journals Immobilization of myoglobin from horse skeletal muscle in hydrophilic polymer networks

2007 ◽  
Vol 107 (2) ◽  
pp. 881-890 ◽  
Author(s):  
Angelines Castro-Forero ◽  
David Jiménez ◽  
Juan López-Garriga ◽  
Madeline Torres-Lugo
Keyword(s):  
Skeletal Muscle ◽  
Polymer Networks ◽  
Hydrophilic Polymer

Ultra-stretchable hydrogels with reactive liquid metals as asymmetric force-sensors

2019 ◽  
Vol 6 (3) ◽  
pp. 618-625 ◽  
Author(s):  
Hao Peng ◽  
Yumeng Xin ◽  
Jun Xu ◽  
Huaizhi Liu ◽  
Jiuyang Zhang
Keyword(s):  
Liquid Metals ◽  
Polymer Networks ◽  
Synthetic Methods ◽  
Force Sensors ◽  
Hydrophilic Polymer ◽  
Sensing Applications ◽  
Reactive Liquid ◽  
Asymmetric Force

Liquid metals (LMs) are used as liquid fillers in hydrophilic polymer networks to realize ultra-stretchable hydrogels as asymmetric force-sensors. The existence of liquid metals endows the hydrogel with unique features in synthetic methods and sensing applications.

scholarly journals Architectured Shape-Memory Hydrogels with Switching Segments Based on Oligo(ε-caprolactone)

MRS Advances ◽  
2016 ◽  
Vol 1 (27) ◽  
pp. 2011-2017 ◽  
Author(s):  
Maria Balk ◽  
Marc Behl ◽  
Ulrich Nöchel ◽  
Andreas Lendlein
Keyword(s):  
Shape Memory ◽  
Material Properties ◽  
Biomedical Applications ◽  
Polymer Networks ◽  
Hydrophilic Polymer ◽  
Potential Candidate ◽  
Thermal Crosslinking ◽  
Porous Microstructure ◽  
Image Position ◽  
Form Stability

ABSTRACTShape-memory hydrogels (SMHs) are potential candidate materials for biomedical applications as they can mimic the elastic properties of soft tissue and exhibit shape transformations at body temperature. Here we explored, whether architectured SMHs can be designed by incorporating oligo(ε-caprolactone) (OCL, ${\overline M _n}$ = 4500 g·mol-1, Tm = 54 °C) side chains as switching segment into hydrophilic polymer networks based on N-vinylpyrrolidone as backbone forming component and oligo(ethylene glycol)divinylether (OEGDVE, ${\overline M _n}$ = 250 g·mol-1) as crosslinker. By utilizing NaCl and NaHCO3 as porogene during thermal crosslinking architectured hydrogels having pore diameters between 30 and 500 µm and wall thicknesses ranging from 10 to 190 µm in the swollen state were synthesized. According to the porous microstructure, a macroscopic form stability was obtained when the polymer networks were swollen until equilibrium in water. Material properties were investigated as function of the OCL content, which was varied between 20 and 40 wt%. In compression experiments the architectured hydrogels exhibited strain fixity and strain recovery ratios above 80%. These architectured SMHs might enable biomaterial applications as smart implants with the recovery of bulky structures from compact shapes.

Soluble chain fractions in hydrophilic polymer networks: origin and effect on dynamic uptake overshoots

Polymer ◽  
1990 ◽  
Vol 31 (7) ◽  
pp. 1288-1293 ◽  
Author(s):  
Alec B. Scranton ◽  
John Klier ◽  
Nikolaos A. Peppas
Keyword(s):  
Polymer Networks ◽  
Hydrophilic Polymer

scholarly journals Design of dual hydrophobic–hydrophilic polymer networks for highly lubricious polyether-urethane coatings

2019 ◽  
Vol 111 ◽  
pp. 82-94 ◽  
Author(s):  
Peter T.M. Albers ◽  
Stefan P.W. Govers ◽  
Jozua Laven ◽  
Leendert G.J. van der Ven ◽  
Rolf A.T.M. van Benthem ◽  
...  
Keyword(s):  
Polymer Networks ◽  
Hydrophilic Polymer

Shape-Memory Hydrogels: Evolution of Structural Principles To Enable Shape Switching of Hydrophilic Polymer Networks

2017 ◽  
Vol 50 (4) ◽  
pp. 723-732 ◽  
Author(s):  
Candy Löwenberg ◽  
Maria Balk ◽  
Christian Wischke ◽  
Marc Behl ◽  
Andreas Lendlein
Keyword(s):  
Shape Memory ◽  
Polymer Networks ◽  
Hydrophilic Polymer ◽  
Structural Principles

Endotoxin Alteration of the Mucopolysaccharide Blood Vessel Coating in Rats

1974 ◽  
Vol 32 ◽  
pp. 148-149
Author(s):  
D. E. Philpott ◽  
A. Takahashi
Keyword(s):  
Skeletal Muscle ◽  
Endothelial Cells ◽  
Salivary Gland ◽  
Carotid Artery ◽  
Basement Membrane ◽  
Coronary Vessels ◽  
Ruthenium Red ◽  
E Coli ◽  
Old Rats ◽  
The Brain

Two month, eight month and two year old rats were treated with 10 or 20 mg/kg of E. Coli endotoxin I. P. The eight month old rats proved most resistant to the endotoxin. During fixation the aorta, carotid artery, basil arartery of the brain, coronary vessels of the heart, inner surfaces of the heart chambers, heart and skeletal muscle, lung, liver, kidney, spleen, brain, retina, trachae, intestine, salivary gland, adrenal gland and gingiva were treated with ruthenium red or alcian blue to preserve the mucopolysaccharide (MPS) coating. Five, 8 and 24 hrs of endotoxin treatment produced increasingly marked capillary damage, disappearance of the MPS coating, edema, destruction of endothelial cells and damage to the basement membrane in the liver, kidney and lung.

Ultra-Rapid Freezing of Isolated Skeletal Muscle Fibers

1977 ◽  
Vol 35 ◽  
pp. 576-577
Author(s):  
Joachim R. Sommer ◽  
Nancy R. Wallace
Keyword(s):  
Skeletal Muscle ◽  
Sarcoplasmic Reticulum ◽  
Granular Material ◽  
Nuclear Envelope ◽  
Intracellular Calcium ◽  
Ruthenium Red ◽  
Threshold Concentration ◽  
Rapid Freezing ◽  
Frog Skeletal Muscle ◽  
Electrical Isolation

After Howell (1) had shown that ruthenium red treatment of fixed frog skeletal muscle caused collapse of the intermediate cisternae of the sarcoplasmic reticulum (SR), forming a pentalaminate structure by obi iterating the SR lumen, we demonstrated that the phenomenon involves the entire SR including the nuclear envelope and that it also occurs after treatment with other cations, including calcium (2,3,4).From these observations we have formulated a hypothesis which states that intracellular calcium taken up by the SR at the end of contraction causes the M rete to collapse at a certain threshold concentration as the first step in a subsequent centrifugal zippering of the free SR toward the junctional SR (JSR). This would cause a) bulk transport of SR contents, such as calcium and granular material (4) into the JSR and, b) electrical isolation of the free SR from the JSR.

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