Journal articles: 'Adhesion resistance'

1

Yao, Ya Dong, Guang Fu Yin, Xiao Wei Cheng, and Xiang Li Gou. "Design and Properties of Fire-Proof Coating for Tunnels." Key Engineering Materials 336-338 (April 2007): 1753–55. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.1753.

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Silicate fireproof coatings for tunnels (FCT) have many eminent properties. But low adhesion strength and poor water/fire-resistance of this kind of materials largely limit its applications. Here we reported a new kind of FCT based on high alumina cement as principle adhesive, redispersible powder as assisting adhesive, ammonium polyphosphate as fire-retardant material, vermiculite as adiabatic padding, and magnesium hydroxide as assisting reagents. The influence of various experimental conditions on fire resistance, adhesion strength and water resistance were carefully studied. Results showed that dispersible emulsoid powder was a key component affecting adhesion strength and water resistance of FCT, whereas fire-retardant material posed significant effects on the fire resistance.

2

Chen, Shuang Lian, Guang Xue Chen, and Jiang Wen Liu. "Study on an Aliphatic Polyurethane Laminating Adhesive Based on Castor Oil." Applied Mechanics and Materials 262 (December 2012): 551–56. http://dx.doi.org/10.4028/www.scientific.net/amm.262.551.

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The first component of the Polyurethane adhesive was prepared with polyester polyol, polyether polyol ,castor oil and isophorone diisocyanate. And this component was mixed with the castor oil and its modified production to prepare a two-component solvent-free aliphatic polyurethane laminating adhesive. In this study, the influences of the copolymerization ratio of polyester/ether on viscosity, heat resistance, adhesion strength and boiling resistance were studied, as well as influences of castor oil and its modified production on curing speed and adhesion strength. The results showed that when proportion of polyether diol was 25% and castor oil was 50% of the total hydroxyl content of first component, the PU adhesive with lower viscosity, better reactivity and enhanced boiling resistance would be achieved. And with an appropriate amount of derivatives castor oil in second component, the curing speed and adhesion strength of the PU adhesive were significantly improved.

3

Hao, S., and L. M. Keer. "Rolling Contact Between Rigid Cylinder and Semi-Infinite Elastic Body With Sliding and Adhesion." Journal of Tribology 129, no. 3 (January 22, 2007): 481–94. http://dx.doi.org/10.1115/1.2736431.

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Based on a hybrid superposition of an indentation contact and a rolling contact an analytical procedure is developed to evaluate the effects of surface adhesion during steady-state rolling contact, whereby two analytic solutions have been obtained. The first solution is a Hertz-type rolling contact between a rigid cylinder and a plane strain semi-infinite elastic substrate with finite adhesion, which is a JKR-type rolling contact but without singular adhesive traction at the edges of the contact zone. The second solution is of a rolling contact with JKR singular adhesive traction. The theoretical solution indicates that, when surface adhesion exists, the friction resistance can be significant provided the external normal force is small. In addition to the conventional friction coefficient, the ratio between friction resistance force and normal force, this paper suggests an “adhesion friction coefficient” which is defined as the ratio between friction resistance force and the sum of the normal force and a function of maximum adhesive traction per unit area, elastic constant of the substrate, and contact area that is characterized by the curvature of the roller surface.

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Li, Shuangshuang, Yanliang Zhao, Hailang Wan, Jianping Lin, and Junying Min. "Molecular Understanding of the Interfacial Interaction and Corrosion Resistance between Epoxy Adhesive and Metallic Oxides on Galvanized Steel." Materials 16, no. 8 (April 13, 2023): 3061. http://dx.doi.org/10.3390/ma16083061.

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The epoxy adhesive-galvanized steel adhesive structure has been widely used in various industrial fields, but achieving high bonding strength and corrosion resistance is a challenge. This study examined the impact of surface oxides on the interfacial bonding performance of two types of galvanized steel with Zn–Al or Zn–Al–Mg coatings. Scanning electron microscopy and X-ray photoelectron spectroscopy analysis showed that the Zn–Al coating was covered by ZnO and Al2O3, while MgO was additionally found on the Zn–Al–Mg coating. Both coatings exhibited excellent adhesion in dry environments, but after 21 days of water soaking, the Zn–Al–Mg joint demonstrated better corrosion resistance than the Zn–Al joint. Numerical simulations revealed that metallic oxides of ZnO, Al2O3, and MgO had different adsorption preferences for the main components of the adhesive. The adhesion stress at the coating–adhesive interface was mainly due to hydrogen bonds and ionic interactions, and the theoretical adhesion stress of MgO adhesive system was higher than that of ZnO and Al2O3. The corrosion resistance of the Zn–Al–Mg adhesive interface was mainly due to the stronger corrosion resistance of the coating itself, and the lower water-related hydrogen bond content at the MgO adhesive interface. Understanding these bonding mechanisms can lead to the development of improved adhesive-galvanized steel structures with enhanced corrosion resistance.

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TONEGAWA, Toru, Takahiro ASAO, Shigeru NOMURA, and Daihei SUGITA. "Self-releasing Tape "Heat Resistance SELFA"." Journal of The Adhesion Society of Japan 51, no. 8 (2015): 396–99. http://dx.doi.org/10.11618/adhesion.51.396.

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Wen, Bor-Jiunn, Pen-Cheng Wang, and Pin-Hsuan Hung. "Numerical and experimental analysis of the effect of metal tie layers on improving electrical properties of gold coated poly (dimethylsiloxane) flexible multi-layered films during folding." Journal of Plastic Film & Sheeting 35, no. 2 (October 9, 2018): 135–56. http://dx.doi.org/10.1177/8756087918805790.

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To improve folding electrical properties of flexible electronics, this study presents a new adhesive stress analysis of depositing an adhesion layer between the conductive film electrode and the flexible substrate during folding test by a folding test platform. The folding test platform controls folding curvature of the flexible conductive substrates, folding times, and velocities in this study. Moreover, the electrical properties of flexible conductive substrates are measured during folding testing by the folding test platform. Eventually, this study successfully analyzes residual strain, adhesive stress, and electrical properties of flexible gold coated on polydimethylsiloxane substrates with chromium, nickel, and titanium adhesion layers up to 0.5/cm folding curvature during folding testing. The chromium adhesion layer had the best performance based on the largest adhesive stress, only 3.74 Ω resistance increase and 4.53 Ω maximum resistance up to 0.5/cm folding curvature during folding test by a folding test platform. The experimental result with chromium adhesion layer is consistent with adhesive stress analysis and provides a better adhesive strength between gold and polydimethylsiloxane than nickel and titanium materials for folding test. Therefore, adhesive stress analysis is adapted to evaluate the foldable electronics performance for improving folding characteristics easier.

7

OHBA, Shintaro. "Earth quake Resistance of Five-story Pagodas." Journal of The Adhesion Society of Japan 45, no. 5 (2009): 178–83. http://dx.doi.org/10.11618/adhesion.45.178.

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Jin, Biyu, Guangfa Zhang, Jiazhang Lian, Qinghua Zhang, Xiaoli Zhan, and Fengqiu Chen. "Boron nitride nanosheet embedded bio-inspired wet adhesives with switchable adhesion and oxidation resistance." Journal of Materials Chemistry A 7, no. 19 (2019): 12266–75. http://dx.doi.org/10.1039/c9ta02827g.

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Kolnes, Mart, Jakob Kübarsepp, Fjodor Sergejev, and Märt Kolnes. "Comparative Study of Adhesive Wear for CoCr, TiC-NiMo, WC-Co as Potential FSW Tool Materials." Solid State Phenomena 267 (October 2017): 224–28. http://dx.doi.org/10.4028/www.scientific.net/ssp.267.224.

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Friction stir welding is a novel and promising joining process and most common welding tool failure is transformation of geometry caused by wear. In our point of view, this is adhesion wear. The lathe testing of adhesion wear was conducted to compare wear resistance of following materials: Co-25wt%Cr, TiC-25wt%Ni/Mo and WC-6wt%Co. According to characteristics of investigated materials, they are capable to become alternatives for conventional frictional stir welding (FSW) tool materials. Adhesive wear tests were performed by turning aluminium alloy AW6082-T6 at low speed – travel length, turning speed and feed rate were selected to simulate FSW conditions. The adhesive wear was determined as the change of the geometry of the cutting edges of the tool measured using SEM images. Most promising tool material in terms of adhesion wear resistance is WC-Co hardmetal. The two main stages of wear were distinguished: at first, the appearance of intensive adhesion wear followed by steady state wear. Surface fatigue wear complements development of the adhesive wear.

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Pradyawong, Sarocha, Guangyan Qi, Meng Zhang, Xiuzhi S. Sun, and Donghai Wang. "Effect of pH and pH-Shifting on Adhesion Performance and Properties of Lignin-Protein Adhesives." Transactions of the ASABE 64, no. 4 (2021): 1141–52. http://dx.doi.org/10.13031/trans.14465.

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HighlightsLignin improved the wet adhesion strength of soy protein adhesives when pH shifted from 8.5 to 4.5.Lignin increased the water resistance of soy protein adhesives from 5% to 40% at pH 12.Lignin improved the thermal resistance of soy protein adhesives.pH and pH-shifting treatments led to property changes of lignin, soy protein, and lignin-soy protein.Abstract. Concerns about public health and the environment have created strong interest in developing alternative green products. The focus of this research was to study the effect of lignin on soy protein (SP) adhesives under different pH and pH-shifting treatments. Additionally, this research was designed to understand the consequence of pH and pH-shifting treatments on the adhesion performance of SP and lignin-SP (LSP) adhesives as well as the characteristics, solubility, glue line patterns, and physiochemical properties. To study the aggregation, soluble, and denatured stages of protein, the protein solutions were adjusted to pH 4.5, 8.5, and 12, respectively. In addition, the study of pH-shifting treatments was performed at pH 8.5 and 12 to unfold and denature the protein, respectively. The protein structure was then refolded by adjusting the pH to 4.5 in adhesive slurries. The adhesives presented good adhesion performance under dry conditions with wood failure in most treatments, while satisfactory wet adhesion performance was obtained at pH 4.5, 8.5 to 4.5, and 12. Shifting the pH from 8.5 to 4.5 increased the lignin-protein interaction and provided the best improvement in adhesion performance. Lignin strengthened the protein structure, increased the water resistance, and improved the thermal stability of SP adhesives. At an extremely high pH, the water resistance of SP increased from 5% to 40% with the addition of lignin. Lignin showed great potential for increasing the wet strength of SP adhesives. The SP and LSP properties and adhesion performance could be adjusted and improved by pH and pH-shifting processes. Lignin-SP interactions, water resistance, and glue line pattern proved to be significant factors contributing to adhesion performance. Keywords: Adhesive, Lignin, Lignin-protein interactions, pH, pH-Shifting, Protein.

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Alabbosh, Khulood Fahad, Tarek Zmantar, Abdulrahman S. Bazaid, Mejdi Snoussi, and Emira Noumi. "Antibiotics Resistance and Adhesive Properties of Clinical Staphylococcus aureus Isolated from Wound Infections." Microorganisms 11, no. 5 (May 22, 2023): 1353. http://dx.doi.org/10.3390/microorganisms11051353.

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Staphylococcus aureus (S. aureus) is a ubiquitous pathogen responsible for several severe infections. This study aimed to investigate the adhesive properties and antibiotic resistance among clinical S. aureus isolated from Hail Hospital Province, Kingdom of Saudi Arabia (KSA), using molecular approaches. This study was conducted according to the ethical committee at Hail’s guidelines on twenty-four S. aureus isolates. A polymerase chain reaction (PCR) was performed to identify genes encoding the β-lactamase resistance (blaZ), methicillin resistance (mecA), fluoroquinolone resistance (norA), nitric oxide reductase (norB), fibronectin (fnbA and fnbB), clumping factor (clfA) and intracellular adhesion factors (icaA and icaD). This qualitative study tested adhesion based on exopolysaccharide production on Congo red agar (CRA) medium and biofilm formation on polystyrene by S. aureus strains. Among 24 isolates, the cna and blaz were the most prevalent (70.8%), followed by norB (54.1%), clfA (50.0%), norA (41.6%), mecA and fnbB (37.5%) and fnbA (33.3%). The presence of icaA/icaD genes was demonstrated in almost all tested strains in comparison to the reference strain, S. aureus ATCC 43300. The phenotypic study of adhesion showed that all tested strains had moderate biofilm-forming capacity on polystyrene and represented different morphotypes on a CRA medium. Five strains among the twenty-four harbored the four genes of resistance to antibiotics (mecA, norA, norB and blaz). Considering the genes of adhesion (cna, clfA, fnbA and fnbB), these genes were present in 25% of the tested isolates. Regarding the adhesive properties, the clinical isolates of S. aureus formed biofilm on polystyrene, and only one strain (S17) produced exopolysaccharides on Congo red agar. All these results contribute to an understanding that the pathogenesis of clinical S. aureus isolates is due to their antibiotic resistance and adhesion to medical material.

12

Osin, V. V. "Flux-cored wires providing deposited metal with high resistance to adhesion wear." Paton Welding Journal 2015, no. 6 (June 28, 2015): 83–86. http://dx.doi.org/10.15407/tpwj2015.06.18.

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Yan, Jin, Guang Xue Chen, Shuang Lian Chen, and Da Qing Wu. "Study on a Solvent-Free PBA/CO-Based PU Adhesive for Aluminum-Plastics Compounding." Advanced Materials Research 380 (November 2011): 294–97. http://dx.doi.org/10.4028/www.scientific.net/amr.380.294.

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In this paper, the polyurethane prepolymer (Component A) was synthesized with PBA, Castor oil, and IPDI as raw material. The structure and viscosity of PU prepolymer was characterized by IR spectra and rotary rheometer. The thermal performance, adhesion properties and water resistance of cured adhesive films were respectively determined by Thermogravimetric analysis (TG), T-style peel strength test, and water absorption test. The results showed that the addition of castor oil reduced the viscosity of prepolymer and greatly improved the water resistance of cured adhesive, but never affected the thermal performance of adhesive. Besides, castor oil was cheaper, easily obtained and more natural than other polyols. However, castor oil slightly decreased the adhesion strength of adhesive. So the amount of castor oil should be considered.

14

Petković, Gorana, Marina Vukoje, Josip Bota, and Suzana Pasanec Preprotić. "Enhancement of Polyvinyl Acetate (PVAc) Adhesion Performance by SiO2 and TiO2 Nanoparticles." Coatings 9, no. 11 (October 30, 2019): 707. http://dx.doi.org/10.3390/coatings9110707.

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Post press processes include various types of bonding and adhesives, depending upon the nature of adherends, the end use performance requirements and the adhesive bonding processes. Polyvinyl acetate (PVAc) adhesive is a widely used adhesive in the graphic industry for paper, board, leather and cloth. In this study, the enhancement of PVAc adhesion performance by adding different concentrations (1%, 2% and 3%) of silica (SiO2) and titanium dioxide (TiO2) nanoparticles was investigated. The morphology of investigated paper-adhesive samples was analyzed by SEM microscopy and FTIR spectroscopy. In addition, the optimal adhesion at the interface of paper and adhesive was found according to calculated adhesion parameters by contact angle measurements (work of adhesion, surface free energy of interphase, wetting coefficient). According to obtained surface free energy (SFE) results, optimum nanoparticles concentration was 1%. The wettability of the paper-adhesive surface and low SFE of interphase turned out as a key for a good adhesion performance. The end use T-peel resistance test of adhesive joints confirmed enhancement of adhesion performance. The highest strength improvement was achieved with 1% of SiO2 nanoparticles in PVAc adhesive.

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Chen, Ying, Ming-Chih Shih, Ming-Huang Wu, En-Cheng Yang, and Kai-Jung Chi. "Underwater attachment using hairs: the functioning of spatula and sucker setae from male diving beetles." Journal of The Royal Society Interface 11, no. 97 (August 6, 2014): 20140273. http://dx.doi.org/10.1098/rsif.2014.0273.

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Males of Dytiscinae beetles use specialized adhesive setae to adhere to female elytra during underwater courtship. This coevolution of male setae and female elytra has attracted much attention since Darwin. However, there has been little examination of their biomechanical functioning despite increasing knowledge on biofibrillar adhesion. Here, we report and compare, for the first time, the mechanisms of underwater attachment using two hair types, the primitive spatula and derived ‘passive’ sucker, found in male diving beetles. Results from interspecific scaling of protarsal palettes and adhesion by single seta suggest better performance in the later-evolved circular (sucker) setae. Spatula setae with a modified shallow sucker and channels use the combined mechanisms of suction and viscous resistance for adhesion. Velocity-dependent adhesion provides sufficient control for resisting the female's erratic movements while also detaching easily through slow peeling. Direction-dependent shear resistance helps reorient setae surfaces into a preferred direction for effective adhesion. Seta deformation using different mechanisms for circular and spatula setae reduces the force that is transmitted to the contact interface. A softer spring in spatula setae explains their adhesion at lower preloads and assists in complete substrate contact. Attachment mechanisms revealed in adhesive setae with modified spatula and passive suckers provide insights for bioinspired designs of underwater attachment devices.

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Antosik, Adrian Krzysztof, Artur Grajczyk, Marzena Półka, Magdalena Zdanowicz, John Halpin, and Marcin Bartkowiak. "Influence of Talc on the Properties of Silicone Pressure-Sensitive Adhesives." Materials 17, no. 3 (February 1, 2024): 708. http://dx.doi.org/10.3390/ma17030708.

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The article describes new silicone self-adhesive adhesives modified with the addition of talc. The obtained self-adhesive materials were characterized to determine their adhesive properties (adhesion, cohesion, and adhesion) and functional properties (pot life of the composition, shrinkage, and thermal properties of adhesives). Novel materials exhibited high thermal resistance above 225 °C while maintaining or slightly reducing other values (adhesion, cohesion, shrinkage, and tack). Selected composition: T 0.1 was used to prepare self-adhesives in industrial-scale production. Moreover, conducted test results revealed that the addition of talc delayed the thermal decomposition of the adhesive and provided reduced intensity of smoke emissions during combustion as well as the flammability of the adhesive layer.

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Yan, Yongqi, Longya Xiao, Qin Teng, Yuanyuan Jiang, Qin Deng, Xuefeng Li, and Yiwan Huang. "Strong, Tough, and Adhesive Polyampholyte/Natural Fiber Composite Hydrogels." Polymers 14, no. 22 (November 17, 2022): 4984. http://dx.doi.org/10.3390/polym14224984.

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Hydrogels with high mechanical strength, good crack resistance, and good adhesion are highly desirable in various areas, such as soft electronics and wound dressing. Yet, these properties are usually mutually exclusive, so achieving such hydrogels is difficult. Herein, we fabricate a series of strong, tough, and adhesive composite hydrogels from polyampholyte (PA) gel reinforced by nonwoven cellulose-based fiber fabric (CF) via a simple composite strategy. In this strategy, CF could form a good interface with the relatively tough PA gel matrix, providing high load-bearing capability and good crack resistance for the composite gels. The relatively soft, sticky PA gel matrix could also provide a large effective contact area to achieve good adhesion. The effect of CF content on the mechanical and adhesion properties of composite gels is systematically studied. The optimized composite gel possesses 35.2 MPa of Young’s modulus, 4.3 MPa of tensile strength, 8.1 kJ m−2 of tearing energy, 943 kPa of self-adhesive strength, and 1.4 kJ m−2 of self-adhesive energy, which is 22.1, 2.3, 1.8, 6.0, and 4.2 times those of the gel matrix, respectively. The samples could also form good adhesion to diverse substrates. This work opens a simple route for fabricating strong, tough, and adhesive hydrogels.

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Pstrowska, Katarzyna, Volodymyr Gunka, Iurii Sidun, Yuriy Demchuk, Nataliya Vytrykush, Marek Kułażyński, and Michael Bratychak. "Adhesion in Bitumen/Aggregate System: Adhesion Mechanism and Test Methods." Coatings 12, no. 12 (December 8, 2022): 1934. http://dx.doi.org/10.3390/coatings12121934.

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A literature review of the five main theories describing the interaction mechanisms in the bitumen/aggregate system was conducted: theory of weak boundary layers, mechanical theory, electrostatic theory, chemical bonding theory, and thermodynamic theory (adsorption theory). The adhesion assessment methods in the bitumen/aggregate system are described, which can be divided into three main groups: determination of adhesion forces for bitumen with different materials, determination of bitumen resistance to the exfoliating action of water with different materials, and determination of adhesion as a fundamental value (contact angle measurements, interfacial fracture energy, adsorption capacity and others). It is proposed to evaluate the quality of adhesive interaction in the bitumen/aggregate system in two stages. The authors recommend using the adhesion determination methods for these two stages from the second group of methods the determination of bitumen resistance to the exfoliating action of water with different materials. In the first stage, the adhesion in the bitumen/aggregate system is determined by an accelerated technique in which the used bitumen binder and mineral material are considered as test materials. After the first stage, there are positive results in the second tests on compacted mixtures (indirect tensile strength test, Modified Lottman indirect tension test, immersion-compression test, and Hamburg wheel tracking test).

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Westhoff, Mike-Andrew, and Simone Fulda. "Adhesion-mediated apoptosis resistance in cancer." Drug Resistance Updates 12, no. 4-5 (August 2009): 127–36. http://dx.doi.org/10.1016/j.drup.2009.08.001.

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Nassr, Mohamed, Igor Krupa, Mabrouk Ouederni, Senthil Kumar Krishnamoorthy, and Anton Popelka. "An Adhesion Improvement of Low-Density Polyethylene to Aluminum through Modification with Functionalized Polymers." Polymers 15, no. 4 (February 11, 2023): 916. http://dx.doi.org/10.3390/polym15040916.

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An interfacial adhesion improvement between low-density polyethylene (LDPE) and aluminum (Al) foil is an important challenge in designing multilayered packaging (TetraPak packaging type) due to insufficient inherent adhesion between both untreated materials. Therefore, extra adhesive layers are often used. The hydrophobic character of LDPE is responsible for poor adhesion to Al and can result in delamination. This study deals with the comparative study of the bulk modification of LDPE with various commercially available adhesive promoters with different chemical compositions to increase LDPE’s adhesive characteristics and ensure good adhesion in LDPE/Al laminates. A copolymer of ethylene and methacrylic acid; a terpolymer of ethylene, maleic anhydride, and acrylic ester; or maleated PE were used as adhesive promoters, and their effect on adhesion improvement of LDPE to Al was investigated. The best adhesion improvement was observed in LDPE-modified samples with maleated PE, while 0.1 wt.% additive content significantly increased peel resistance (from zero to 105 N/m). An additional increase in additive content (0.5 wt.%) in LDPE led to stronger adhesion forces than the cohesion forces in Al foil. Adding 0.5 wt.% of maleated PE into LDPE improved the LDPE/Al laminates’ adhesion and can be applied in multilayered lamination applications.

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Nesvetaev, G. V., A. V. Dolgova, L. V. Postoy, and G. N. Hadzhishalapov. "INFLUENCE OF REDISPERSIBLE POWDERS AND LOW-MODULAR INCLUSIONS ON THE FROST RESISTANCE OF THE FINE-GRAINED CONCRETE CONTACT ZONE." Herald of Dagestan State Technical University. Technical Sciences 46, no. 4 (January 2, 2020): 186–96. http://dx.doi.org/10.21822/2073-6185-2019-46-4-186-196.

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Objectives. The aim of this study was to identify variation patterns of the in-series variation coefficient of adhesive strength to base and the dependency of the frost resistance coefficient on the criterion of adhesion on prescription factors of fine-grained concrete obtained from dry building mixtures based on various Portland cements containing various low-modulus inclusions and redispersible polymer powders from 0 to 3%. According to GOST 31357, the main quality indicators of the hardened mixture or fine-grained concrete, in addition to frost resistance, include the indicator of “frost resistance of the contact zone”, which characterises the ability of the hardened concrete to maintain adhesion to the base during normal separation following a certain number of freeze-thaw cycles.Method. The tests of the main samples were carried out after 75 freeze-thaw cycles in accordance with GOST 31356. The marks of the frost resistance of the contact zone are set from FKZ25 to FKZ100. The number of freeze-thaw cycles is taken as a mark, after which the adhesion strength to the base, determined according to GOST 31356, is at least 80% of the strength of the control samples. The arithmetical average is taken at between at least 5 values, while the variation coefficient measured across a series of adhesion strength values is not considered.Results. The average values of the variation coefficient of adhesion strength were: following 75 cycles of freezing-thawing – 0.224 (in a range from 0.058 to 0.616); following 25 cycles of freezing-thawing – an average of 0.129 (in a range from 0.016 to 0.352). The variation coefficient of adhesion strength can exceed the variation coefficient of compression strength by approximately 2.5 to 3 times. When introducing the redispersible powders into the structure of fine-grained concrete, there is no unambiguous pattern of change in the values of the variation coefficient of adhesion to base and it is possible to increase or decrease this value, while the values of the variation coefficient of adhesion can vary by an order of magnitude.Conclusion. For all concretes, there is a tendency of increase of the coefficient of frost resistance with a decrease in the adhesion variation coefficient both after hardening under normal conditions as well as during cyclic freezing and thawing. When conditions VF/V28A<1 are met, the coefficient of frost resistance of adhesion, determined when considering the variation coefficient, will satisfy the requirements of GOST 31356.

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KUWASHIRO, Shiho, Nozomu NAKAO, Satoshi MATSUDA, and Hajime KISHI. "Bending Fatigue Resistance of Carbon Fiber Reinforced Thermoplastic Acrylic Resin." Journal of The Adhesion Society of Japan 53, no. 3 (March 1, 2017): 83–88. http://dx.doi.org/10.11618/adhesion.53.83.

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Antosik, Adrian Krzysztof, Karolina Mozelewska, Marlena Musik, Piotr Miądlicki, and Katarzyna Wilpiszewska. "Influence of Illite and Its Amine Modifications on the Self-Adhesive Properties of Silicone Pressure-Sensitive Adhesives." Materials 16, no. 7 (April 4, 2023): 2879. http://dx.doi.org/10.3390/ma16072879.

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Obtaining new silicone self-adhesive in the presence of modified illite has been described. The filler was modified with N,N,4-trimethylaniline. The effect of illite content and modification on functional properties (adhesion, cohesion, stickiness, and shrinkage) was determined. Additionally, the thermal resistance (the SAFT test) of obtained silicone pressure-sensitive adhesives was evaluated. For all the systems tested, an increase in thermal resistance and shrinkage decrease were noted. Moreover, only a slight adhesion and tack decrease was revealed. Such self-adhesives could be applied for joining elements operating at increased temperatures, e.g., in heavy industry.

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Dzhamuev, Bulat. "The effect of polyurethane foam glue on the strength and deformability of aerated concrete masonry when using it as a masonry mortar." E3S Web of Conferences 410 (2023): 02032. http://dx.doi.org/10.1051/e3sconf/202341002032.

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The article presents the results of experimental studies of masonry made of cellular concrete blocks of autoclave hardening YTONG produced by JSC «Kcell-Aeroblock-Center» on the adhesive composition (polyurethane glue) Dryfix (POLYPAG AG). The tests included comprehensive studies of the strength and deformability of masonry walls made of cellular concrete blocks, under various types of stress state of structures: central and off-center compression of masonry walls, axial tension on bandaged and unbound seams, tensile bending on bandaged and unbound seams, shear with an assessment of tangential adhesion. Tests have confirmed the inconsistency of the technology of laying blocks of cellular concrete on the adhesive composition of Dryfix with incomplete filling of seams. This technology has a significant impact on the strength of the masonry during bending: the adhesion of the blocks to each other with such an adhesive composition applied to the surface of the block is significantly lower than the value obtained when testing the blocks for axial tension. According to the results of the experiments, the value of the temporary resistance to axial stretching along the unbound section (normal adhesion) of the masonry, the values of the calculated resistance of the masonry to stretching during bending along the unbound and tied sections, as well as the value of the calculated resistance of the masonry under central compression were determined.

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HIKASA, Shigeki. "Improvement of Impact Resistance of Polypropylene Composites by Controlling of Morphology." Journal of The Adhesion Society of Japan 48, no. 10 (2012): 354–60. http://dx.doi.org/10.11618/adhesion.48.354.

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González-Tarragó, Víctor, Alberto Elosegui-Artola, Elsa Bazellières, Roger Oria, Carlos Pérez-González, and Pere Roca-Cusachs. "Binding of ZO-1 to α5β1 integrins regulates the mechanical properties of α5β1–fibronectin links." Molecular Biology of the Cell 28, no. 14 (July 7, 2017): 1847–52. http://dx.doi.org/10.1091/mbc.e17-01-0006.

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Fundamental processes in cell adhesion, motility, and rigidity adaptation are regulated by integrin-mediated adhesion to the extracellular matrix (ECM). The link between the ECM component fibronectin (fn) and integrin α5β1 forms a complex with ZO-1 in cells at the edge of migrating monolayers, regulating cell migration. However, how this complex affects the α5β1-fn link is unknown. Here we show that the α5β1/ZO-1 complex decreases the resistance to force of α5β1–fn adhesions located at the edge of migrating cell monolayers while also increasing α5β1 recruitment. Consistently with a molecular clutch model of adhesion, this effect of ZO-1 leads to a decrease in the density and intensity of adhesions in cells at the edge of migrating monolayers. Taken together, our results unveil a new mode of integrin regulation through modification of the mechanical properties of integrin–ECM links, which may be harnessed by cells to control adhesion and migration.

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Ablouh, El-Houssaine, François Brouillette, Moha Taourirte, Houssine Sehaqui, Mounir El Achaby, and Ahmed Belfkira. "A highly efficient chemical approach to producing green phosphorylated cellulosic macromolecules." RSC Advances 11, no. 39 (2021): 24206–16. http://dx.doi.org/10.1039/d1ra02713a.

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The introduction of phosphate groups into cellulosic fibers allows for the tuning of their fire resistance, chelating and metal-adhesion properties, enabling the development of flame-retardant adhesive and adsorbent materials.

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Moy, Alan B., Ken Blackwell, and Anant Kamath. "Differential effects of histamine and thrombin on endothelial barrier function through actin-myosin tension." American Journal of Physiology-Heart and Circulatory Physiology 282, no. 1 (January 1, 2002): H21—H29. http://dx.doi.org/10.1152/ajpheart.2002.282.1.h21.

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We compared temporal changes in isometric tension in cultured human umbilical vein endothelial cells inoculated on a polymerized collagen membrane with changes in cell-cell and cell-matrix adhesion derived by a mathematical model of transendothelial cell resistance. Thrombin and histamine disrupt barrier function by targeting a greater loss in cell-cell adhesion, which preceded losses in overall transendothelial resistance. There were minor losses in cell-matrix adhesion, which was temporally slower than the decline in the overall transendothelial resistance. In contrast, thrombin and histamine restored barrier function by initiating a restoration of cell-matrix adhesion, which occurred before an increase in overall transendothelial resistance. Thrombin mediated a second and slower decline in cell-cell adhesion, which was not observed in histamine-treated cells. This decline in cell-cell adhesion temporally correlated with expressed maximal levels of tension development, suggesting that actin-myosin contraction directly strains cell-cell adhesion sites. Pretreatment of cells with ML-7 mediated more rapid recovery of cell-cell adhesion and had no effect on cell-matrix adhesion. Taken together, expression of actin-myosin contraction affects the restoration of barrier function by straining cell-cell adhesion sites.

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CAO, Y., C. H. CHEN, Y. F. WU, X. F. XU, R. G. XIE, and J. B. TANG. "Digital Oedema, Adhesion Formation and Resistance to Digital Motion after Primary Flexor Tendon Repair." Journal of Hand Surgery (European Volume) 33, no. 6 (October 20, 2008): 745–52. http://dx.doi.org/10.1177/1753193408096022.

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The development of digital oedema, adhesion formation, and resistance to digital motion at days 0, 3, 5, 7, 9 and 14 after primary flexor tendon repairs using 102 long toes of 51 Leghorn chickens was studied. Oedema presented as tissue swelling from days 3 to 7, which peaked at day 3. After day 7, oedema was manifest as hardening of subcutaneous tissue. The degree of digital swelling correlated with the resistance to tendon motion between days 3 and 7. At day 9, granulation tissues were observed around the tendon and loose adhesions were observed at day 14. Resistance to digital motion increased significantly from day 0 to day 3, but did not increase between days 3 and 9. The early postoperative changes appear to have three stages: initial (days 0–3, increasing resistance with development of oedema), delayed (days 4–7, higher resistance with continuing oedema) and late (after day 7–9, hardening of subcutaneous tissue with development of adhesions).

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Frisch, S. M., K. Vuori, E. Ruoslahti, and P. Y. Chan-Hui. "Control of adhesion-dependent cell survival by focal adhesion kinase." Journal of Cell Biology 134, no. 3 (August 1, 1996): 793–99. http://dx.doi.org/10.1083/jcb.134.3.793.

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The interactions of integrins with extracellular matrix proteins can activate focal adhesion kinase (FAK) and suppress apoptosis in normal epithelial and endothelial cells; this subset of apoptosis has been termed "anoikis." Here, we demonstrate that FAK plays a role in the suppression of anoikis. Constitutively activated forms of FAK rescued two established epithelial cell lines from anoikis. Both the major autophosphorylation site (Y397) and a site critical to the kinase activity (K454) of FAK were required for this effect. Activated FAK also transformed MDCK cells, by the criteria of anchorage-independent growth and tumor formation in nude mice. We provide evidence that this transformation resulted primarily from the cells' resistance to anoikis rather than from the activation of growth factor response pathways. These results indicate that FAK can regulate anoikis and that the conferral of anoikis resistance may suffice to transform certain epithelial cells.

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Kurtova, Antonina V., Archito T. Tamayo, Richard J. Ford, and Jan A. Burger. "Mantle cell lymphoma cells express high levels of CXCR4, CXCR5, and VLA-4 (CD49d): importance for interactions with the stromal microenvironment and specific targeting." Blood 113, no. 19 (May 7, 2009): 4604–13. http://dx.doi.org/10.1182/blood-2008-10-185827.

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Abstract Mantle cell lymphoma (MCL) is characterized by an early, widespread dissemination and residual disease after conventional treatment, but the mechanisms responsible for lymphoma cell motility and drug resistance are largely unknown. There is growing evidence suggesting that chemokine receptors and adhesion molecules are critical for malignant B-cell trafficking and homing to supportive tissue microenvironments, where they receive survival and drug resistance signals. Therefore, we examined chemokine receptor and adhesion molecule expression and function in MCL cells and their importance for migration and adhesion to marrow stromal cells (MSCs). We found that MCL cells display high levels of functional CXCR4 and CXCR5 chemokine receptors and VLA-4 adhesion molecules. We also report that MCL cells adhere and spontaneously migrate beneath MSCs in a CXCR4- and VLA-4–dependent fashion (pseudoemperipolesis). Moreover, we demonstrate that MSCs confer drug resistance to MCL cells, particularly to MCL cells that migrate beneath MSC. To target MCL-MSC interactions, we tested Plerixafor, a CXCR4 antagonist, and natalizumab, a VLA-4 antibody. Both agents blocked functional responses to the respective ligands and inhibited adhesive interactions between MCL cells and MSCs. These findings provide a rationale to further investigate the therapeutic potential of these drugs in MCL.

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Cole, Leah E., Thomas H. Kawula, Kristen L. Toffer, and Christopher Elkins. "The Haemophilus ducreyi Serum Resistance Antigen DsrA Confers Attachment to Human Keratinocytes." Infection and Immunity 70, no. 11 (November 2002): 6158–65. http://dx.doi.org/10.1128/iai.70.11.6158-6165.2002.

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ABSTRACT Haemophilus ducreyi is the etiologic agent of the sexually transmitted genital ulcer disease chancroid. H. ducreyi serum resistance protein A (DsrA) is a member of a family of multifunctional outer membrane proteins that are involved in resistance to killing by human serum complement. The members of this family include YadA of Yersinia species, the UspA proteins of Moraxella catarrhalis, and the Eib proteins of Escherichia coli. The role of YadA, UspA1, and UspA2H as eukaryotic cell adhesins and the function of UspA2 as a vitronectin binder led to our investigation of the cell adhesion and vitronectin binding properties of DsrA. We found that DsrA was a keratinocyte-specific adhesin as it was necessary and sufficient for attachment to HaCaT cells, a keratinocyte cell line, but was not required for attachment to HS27 cells, a fibroblast cell line. We also found that DsrA was specifically responsible for the ability of H. ducreyi to bind vitronectin. We then theorized that DsrA might use vitronectin as a bridge to bind to human cells, but this hypothesis proved to be untrue as eliminating HaCaT cell binding of vitronectin with a monoclonal antibody specific to integrin αvβ5 did not affect the attachment of H. ducreyi to HaCaT cells. Finally, we wanted to examine the importance of keratinocyte adhesion in chancroid pathogenesis so we tested the wild-type and dsrA mutant strains of H. ducreyi in our swine models of chancroid pathogenesis. The dsrA mutant was less virulent than the wild type in both the normal and immune cell-depleted swine models of chancroid infection.

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Gatlin, Jesse C., Adriana Estrada-Bernal, Staci D. Sanford, and Karl H. Pfenninger. "Myristoylated, Alanine-rich C-Kinase Substrate Phosphorylation Regulates Growth Cone Adhesion and Pathfinding." Molecular Biology of the Cell 17, no. 12 (December 2006): 5115–30. http://dx.doi.org/10.1091/mbc.e05-12-1183.

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Repellents evoke growth cone turning by eliciting asymmetric, localized loss of actin cytoskeleton together with changes in substratum attachment. We have demonstrated that semaphorin-3A (Sema3A)-induced growth cone detachment and collapse require eicosanoid-mediated activation of protein kinase Cε (PKCε) and that the major PKCε target is the myristoylated, alanine-rich C-kinase substrate (MARCKS). Here, we show that PKC activation is necessary for growth cone turning and that MARCKS, while at the membrane, colocalizes with α3-integrin in a peripheral adhesive zone of the growth cone. Phosphorylation of MARCKS causes its translocation from the membrane to the cytosol. Silencing MARCKS expression dramatically reduces growth cone spread, whereas overexpression of wild-type MARCKS inhibits growth cone collapse triggered by PKC activation. Expression of phosphorylation-deficient, mutant MARCKS greatly expands growth cone adhesion, and this is characterized by extensive colocalization of MARCKS and α3-integrin, resistance to eicosanoid-triggered detachment and collapse, and reversal of Sema3A-induced repulsion into attraction. We conclude that MARCKS is involved in regulating growth cone adhesion as follows: its nonphosphorylated form stabilizes integrin-mediated adhesions, and its phosphorylation-triggered release from adhesions causes localized growth cone detachment critical for turning and collapse.

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Gristina, Anthony G., Paul T. Naylor, and Quentin N. Myrvik. "Musculoskeletal Infection, Microbial Adhesion, and Antibiotic Resistance." Infectious Disease Clinics of North America 4, no. 3 (September 1990): 391–408. http://dx.doi.org/10.1016/s0891-5520(20)30353-6.

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Croix, Brad St, and Robert S. Kerbel. "Cell adhesion and drug resistance in cancer." Current Opinion in Oncology 9, no. 6 (November 1997): 549–56. http://dx.doi.org/10.1097/00001622-199711000-00010.

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Béthencourt, Mathilde I., David Barriet, Nathalie M. Frangi, and T. Randall Lee. "Model Glycol-Terminated Surfaces for Adhesion Resistance." Journal of Adhesion 81, no. 10-11 (October 2005): 1031–48. http://dx.doi.org/10.1080/00218460500310762.

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Han, Guebum, and Melih Eriten. "Effect of relaxation-dependent adhesion on pre-sliding response of cartilage." Royal Society Open Science 5, no. 5 (May 2018): 172051. http://dx.doi.org/10.1098/rsos.172051.

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Possible links between adhesive properties and the pre-sliding (static) friction response of cartilage are not fully understood in the literature. The aims of this study are to investigate the relation between adhesion and relaxation time in articular cartilage, and the effect of relaxation-dependent adhesion on the pre-sliding response of cartilage. Adhesion tests were performed to evaluate the work of adhesion of cartilage at different relaxation times. Friction tests were conducted to identify the pre-sliding friction response of cartilage at relaxation times corresponding to adhesion tests. The pre-sliding friction response of cartilage was systematically linked to the work of adhesion and contact conditions by a slip-based failure model. It was found that the work of adhesion increases with relaxation time. Also, the work of adhesion is linearly correlated to the resistance to slip-based failure. In addition, as the work of adhesion increases, the adhered (stick) area at the moment of failure increases, and the propagation rate of the annular slip (crack) area towards its centre increases. These findings offer a mechanistic explanation of the pre-sliding friction behaviour and stick–slip response of soft hydrated interfaces such as articular cartilage and hydrogels. In addition, the linear correlation between adhesion and threshold to slip-based failure enables estimation of the adhesive strength of such interfaces directly from the pre-sliding friction response (e.g. shear wave elastography).

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Galski, Hanan, Masha Simanovsky, and Arnon Nagler. "Malignant Progression of Human CML Clone Demonstrates a Unique Developmental Pathway Characterized by Altered Expression Pattern of Cancer, Adhesion and Drug Resistance Genes." Blood 108, no. 11 (November 16, 2006): 4293. http://dx.doi.org/10.1182/blood.v108.11.4293.4293.

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Abstract The K562 cell line is a clone derived from a patient with CML in blast crisis and is widely used as a meaningful model for experimental and clinical studies. Similarly to primary CML blasts, K562 grow mostly in suspension in the absence of supportive bone marrow stromal cells or plate-coating of adhesion molecules. However, under standard culture conditions a relatively small cell-fraction (2–3%) adheres to the plastic dish. In this study, we investigated whether the plastic-adhesive sub-population is a side population of clonal origin and whether it has unique malignant properties. For these reasons, we have established and characterized a new cellular model system of plastic-adhesive variants of K562 (termed K562/Adh and K562/sAdh). These adhesive-variants retain self-renewal ability with indications of increased malignant properties as increased colony-forming ability in soft agar, impairment of contact inhibition and loss of serum-dependent attenuation of adhesion. cDNA microarray analyses that were validated by quantitative RT-PCR analyses have shown altered expression levels of adhesion related genes in the adhesive variants relatively to the parental cells. This included 4.0-, 3.1- and 2.5- fold up-regulation of the KiSS-1, THBS3, ITGB5 genes, respectively, and 1.7- fold down-regulation of the FN1 gene. Moreover, up-regulation of the BCR-ABL fusion gene (3.1- fold) and of the AP1 transcription factors genes, c-JUN (4.5-fold) and c-FOS (2.8-fold), was found in the adhesive variants relatively to their parental cells. Other transcription factors from the AP1 family (FRA1, JUN-B and JUN-D) similarly expressed in all K562 variants. Interestingly, both adhesive cell variants also demonstrated a de-novo expression of the multidrug resistance, MDR1 gene. Our data strongly suggest that the adhesive-variants of K562 cells are an outcome of a unique pathway of malignant progression that not only involves novel adhesion properties. Cellular cloning experiments and molecular gene-expression analyses of various clones indicated that this malignancy progression pathway is a global inherited property of K562 cells. Although the progeny of any parental K562 have the potential to transform into adherent cells, only a confined fraction (3.0±0.5 %) of progeny cells undergo such transformation in apparently stochastic manner. The factors involved in the induction of this transformation process in a particular progeny cell are yet unknown. However, growing K562 cells in pre-conditioned medium from cultures of K562/Adh or K562/sAdh did not change the size of adhered cell fraction, suggesting that their adhesion is independent of molecules that are specifically released or secreted by the adhesive variants of K562. Neither growing K562/Adh nor K562/sAdh in pre-conditioned medium from cultures of the parental K562 affected their adhesion properties. In conclusion, we demonstrated existence of a unique unidirectional, adhesion-based transformation pathway of CML blasts. This pathway is also characterized by altered pattern of gene expression that is associated with increased malignant properties. As the resultant transformed cells can be discriminated by adhesion to plastic, this system may serve as a model to investigate the clinical and therapeutic implications of such transformation in CML progression, drug-resistance and minimal residual disease.

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Damiano, Jason S., Anne E. Cress, Lori A. Hazlehurst, Alexander A. Shtil, and William S. Dalton. "Cell Adhesion Mediated Drug Resistance (CAM-DR): Role of Integrins and Resistance to Apoptosis in Human Myeloma Cell Lines." Blood 93, no. 5 (March 1, 1999): 1658–67. http://dx.doi.org/10.1182/blood.v93.5.1658.

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Abstract Integrin-mediated adhesion influences cell survival and may prevent programmed cell death. Little is known about how drug-sensitive tumor cell lines survive initial exposures to cytotoxic drugs and eventually select for drug-resistant populations. Factors that allow for cell survival following acute cytotoxic drug exposure may differ from drug resistance mechanisms selected for by chronic drug exposure. We show here that drug-sensitive 8226 human myeloma cells, demonstrated to express both VLA-4 (4β1) and VLA-5 (5β1) integrin fibronectin (FN) receptors, are relatively resistant to the apoptotic effects of doxorubicin and melphalan when pre-adhered to FN and compared with cells grown in suspension. This cell adhesion mediated drug resistance, or CAM-DR, was not due to reduced drug accumulation or upregulation of anti-apoptotic Bcl-2 family members. As determined by flow cytometry, myeloma cell lines selected for drug resistance, with either doxorubicin or melphalan, overexpress VLA-4. Functional assays revealed a significant increase in 4-mediated cell adhesion in both drug-resistant variants compared with the drug-sensitive parent line. When removed from selection pressure, drug-resistant cell lines reverted to a drug sensitive and 4-low phenotype. Whether VLA-4–mediated FN adhesion offers a survival advantage over VLA-5–mediated adhesion remains to be determined. In conclusion, we have demonstrated that FN-mediated adhesion confers a survival advantage for myeloma cells acutely exposed to cytotoxic drugs by inhibiting drug-induced apoptosis. This finding may explain how some cells survive initial drug exposure and eventually express classical mechanisms of drug resistance such as MDR1 overexpression.

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Damiano, Jason S., Anne E. Cress, Lori A. Hazlehurst, Alexander A. Shtil, and William S. Dalton. "Cell Adhesion Mediated Drug Resistance (CAM-DR): Role of Integrins and Resistance to Apoptosis in Human Myeloma Cell Lines." Blood 93, no. 5 (March 1, 1999): 1658–67. http://dx.doi.org/10.1182/blood.v93.5.1658.405a19_1658_1667.

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Integrin-mediated adhesion influences cell survival and may prevent programmed cell death. Little is known about how drug-sensitive tumor cell lines survive initial exposures to cytotoxic drugs and eventually select for drug-resistant populations. Factors that allow for cell survival following acute cytotoxic drug exposure may differ from drug resistance mechanisms selected for by chronic drug exposure. We show here that drug-sensitive 8226 human myeloma cells, demonstrated to express both VLA-4 (4β1) and VLA-5 (5β1) integrin fibronectin (FN) receptors, are relatively resistant to the apoptotic effects of doxorubicin and melphalan when pre-adhered to FN and compared with cells grown in suspension. This cell adhesion mediated drug resistance, or CAM-DR, was not due to reduced drug accumulation or upregulation of anti-apoptotic Bcl-2 family members. As determined by flow cytometry, myeloma cell lines selected for drug resistance, with either doxorubicin or melphalan, overexpress VLA-4. Functional assays revealed a significant increase in 4-mediated cell adhesion in both drug-resistant variants compared with the drug-sensitive parent line. When removed from selection pressure, drug-resistant cell lines reverted to a drug sensitive and 4-low phenotype. Whether VLA-4–mediated FN adhesion offers a survival advantage over VLA-5–mediated adhesion remains to be determined. In conclusion, we have demonstrated that FN-mediated adhesion confers a survival advantage for myeloma cells acutely exposed to cytotoxic drugs by inhibiting drug-induced apoptosis. This finding may explain how some cells survive initial drug exposure and eventually express classical mechanisms of drug resistance such as MDR1 overexpression.

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Ling, Tian Qing, Yuan Yuan Wang, and Chao Hui Shi. "Phased Evaluation Theory and Study on Adhesion between Asphalt and Stone Based on Surface Energy Theory." Advanced Materials Research 723 (August 2013): 459–65. http://dx.doi.org/10.4028/www.scientific.net/amr.723.459.

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As for the existing surface energy adhesion theories which are used to evaluate asphalt and stone's adhesive performance quantitatively, they are either dealing with the interface between solid asphalt and solid stone which can not adhere according to the formulas and definitions in process of adhesion or else roughly characterizing the solid asphalt and stone's adhesion properties with the adhesion index of heated asphalt and solid stone. So according to the forming process of asphalt mixture , this paper puts forward the method and principle to evaluate asphalt and stone's adhesion based on the surface energy theory. It evaluates the adhesion properties of asphalt and stone under hydrous and anhydrous conditions respectively. In the anhydrous condition, we choose contact angle and the Gibbs free energy of failure stage as the indexes of evaluating asphalt - stone interface's adhesion properties, while the materials under the hydrous condition, we select cohesional work, contact angle, Gibbs free energy as the indexes of evaluating asphalt-stone system's resistance of moisture.

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Pyrig, Yan, and Andrey Galkin. "Increasing pavement bitumen adhesion with DAD adhesion additives." Bulletin of Kharkov National Automobile and Highway University, no. 93 (May 27, 2021): 83–92. http://dx.doi.org/10.30977/bul.2219-5548.2021.93.0.83.

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An important factor that largely determines the water resistance and durability of asphalt pavements is the adhesion of bituminous binders to the surface of stone materials. The most common method of increasing the adhesion of binders is the use of adhesive additives. Given that the range of adhesives used in the road industry is con-stantly updated, and their effectiveness is determined by the characteristics of binders and stone materials, issues related to the assessment of the impact of additives on the properties and, in particular, the adhesion of bituminous binders, are relevant. Goal. The aim of the study was to evaluate the effects of adhesive additives of the DAD series on the proper-ties of bitumen used in the road industry of Ukraine. Methodology. For bitumen modified with DAD-1, DAD-K and DAD-KT 2 additives, standard quality indicators have been determined in accordance with the norms of national standards DSTU 4044 and SOU 45.2-00018112-067. Particular attention was paid to determining the adhesive properties of binders, which were evaluated by the method of adhesion to the glass surface and the method of rotation of the bottle, and the thermal stability of additives is evaluated by changes in adhesion after aging of binders by TFOT and RTFOT. Based on the obtained experimental data, it was found that the adhesion additives of DAD have practically no effect on the basic standard quality indicators of road viscous bitumen. When modifying bitumen with the maximum concentrations recommended by the manufacturer, the additives significantly increase the adhesion of bitumen to the glass surface. The surface of the grains of the ac-cepted stone materials treated with bitumen modified with the additive DAD-KT 2, after the test by the method of rotation of the bottle for 6 hours showed 40% of them remain covered with binder. Novelty. The thermal stability of DAD adhesive additives significantly depends on the accepted method of aging. The main factor that reduces the adhesive properties of the DAD-1 additive is the intense interaction with air. The adhesion properties of bitumen modified with the addition of DAD-CT 2 is significantly increased after aging. Practical value. The expediency and efficiency of the use of additives of the DAD series in the production of asphalt concrete mixtures should be established based on the characteristics of the bitumen and stone materials used.

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Heath, Daniel E., Abdul Rahim Mohamed Sharif, Chee Ping Ng, Mary G. Rhoads, Linda G. Griffith, Paula T. Hammond, and Mary B. Chan-Park. "Regenerating the cell resistance of micromolded PEG hydrogels." Lab on a Chip 15, no. 9 (2015): 2073–89. http://dx.doi.org/10.1039/c4lc01416b.

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Micromolded hydrogels lose non-fouling properties enabling cell adhesion and migration on the gel (left). We develop a method to regenerate the cell resistance of the gels resulting in robust resistance to cell adhesion (right).

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Maglione García, Luis Francisco, Vicente Castelo Branco Leitune, Stéfani Becker Rodrigues, Susana Maria Werner Samuel, and Fabrício Mezzomo Collares. "Influence of adhesive system on quartz fiber post dislocation resistance in endodontically treated teeth." Brazilian Journal of Oral Sciences 15, no. 1 (October 13, 2016): 62. http://dx.doi.org/10.20396/bjos.v15i1.8647126.

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Aim: To evaluate the dislocation resistance of the quartz fiber post/cement/dentin interface after different adhesion strategies. Methods: Forty bovine lower central incisors were selected and prepared with K-files using the step-back technique, and irrigated with 3 mL of distilled water preceding the use of each instrument. Prepared teeth were stored at 37ºC and 100% humidity for 7 days. The roots were prepared and randomized into 4 groups. The quartz fiber post was cemented with an adhesion strategy according to the following groups: GBisCem- BISCEM; GOneStep±C&B- One Step ± C&B; GAllBond±C&B- AllBond3 ± C&B; GAllBondSE±C&B- AllBondSE ±C&B with a quartz fiber post. Cross-sectional root slices of 0.7 mm were produced and stored for 24 h at 37° C before being submitted to push-out bond strength. Results: The mean and standard deviation values of dislocation resistance were GBisCem: 1.12 (± 0.23) MPa, GOneStep±C&B: 0.81 (± 0.31) MPa, GAllBond±C&B: 0.98 (± 0.14) MPa, and GAllBondSE±C&B: 1.57 (± 0.04) MPa. GAllBondSE±C&B showed significantly higher values of dislocation resistance than the other groups. Conclusions: Based on this study design, it may be concluded that adhesion strategies showed different results of quartz post dislocation resistance. Simplified adhesive system with sodium benzene sulphinate incorporation provided superior dislocation resistance.

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Schütz, M., E. M. Weiss, M. Schindler, T. Hallström, P. F. Zipfel, D. Linke, and I. B. Autenrieth. "Trimer Stability of YadA Is Critical for Virulence of Yersinia enterocolitica." Infection and Immunity 78, no. 6 (March 22, 2010): 2677–90. http://dx.doi.org/10.1128/iai.01350-09.

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ABSTRACT Yersinia adhesin A (YadA) is a trimeric autotransporter adhesin with multiple functions in host-pathogen interactions. The aim of this study was to dissect the virulence functions promoted by YadA in vitro and in vivo. To accomplish this, we generated Yersinia enterocolitica O:8 mutants expressing point mutations in YadA G389, a highly conserved residue in the membrane anchor of YadA, and analyzed their impact on YadA expression and virulence functions. We found that point mutations of YadA G389 led to impaired transport, stability, and surface display of YadA. YadA G389A and G389S mutants showed comparable YadA surface expression, autoagglutination, and adhesion to those of wild-type YadA but displayed reduced trimer stability and complement resistance in vitro and were 10- to 1,000-fold attenuated in experimental Y. enterocolitica infection in mice. The G389T, G389N, and G389H mutants lost trimer stability, exhibited strongly reduced surface display, autoagglutination, adhesion properties, and complement resistance, and were avirulent (>10,000-fold attenuation) in mice. Our data demonstrate that G389 is a critical residue of YadA, required for optimal trimer stability, transport, surface display, and serum resistance. We also show that stable trimeric YadA protein is essential for virulence of Y. enterocolitica.

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Cortesio, Christa L., Lindsy R. Boateng, Timothy M. Piazza, David A. Bennin, and Anna Huttenlocher. "Calpain-mediated Proteolysis of Paxillin Negatively Regulates Focal Adhesion Dynamics and Cell Migration." Journal of Biological Chemistry 286, no. 12 (January 26, 2011): 9998–10006. http://dx.doi.org/10.1074/jbc.m110.187294.

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The dynamic turnover of integrin-mediated adhesions is important for cell migration. Paxillin is an adaptor protein that localizes to focal adhesions and has been implicated in cell motility. We previously reported that calpain-mediated proteolysis of talin1 and focal adhesion kinase mediates adhesion disassembly in motile cells. To determine whether calpain-mediated paxillin proteolysis regulates focal adhesion dynamics and cell motility, we mapped the preferred calpain proteolytic site in paxillin. The cleavage site is between the paxillin LD1 and LD2 motifs and generates a C-terminal fragment that is similar in size to the alternative product paxillin delta. The calpain-generated proteolytic fragment, like paxillin delta, functions as a paxillin antagonist and impairs focal adhesion disassembly and migration. We generated mutant paxillin with a point mutation (S95G) that renders it partially resistant to calpain proteolysis. Paxillin-deficient cells that express paxillin S95G display increased turnover of zyxin-containing adhesions using time-lapse microscopy and also show increased migration. Moreover, cancer-associated somatic mutations in paxillin are common in the N-terminal region between the LD1 and LD2 motifs and confer partial calpain resistance. Taken together, these findings suggest a novel role for calpain-mediated proteolysis of paxillin as a negative regulator of focal adhesion dynamics and migration that may function to limit cancer cell invasion.

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OLEKSANDRENKO, V., V. SVIDERSRKYI, L. KIRICHENKO, and V. YEFYMENKO. "THE INFLUENCE OF COMPOSITION AND TECHNOLOGICAL FACTORS ON ADHESION STRENGTH OF FLUOROPLASTICS COATINGS TO METAL SURFACES." Herald of Khmelnytskyi National University 301, no. 5 (October 2021): 45–51. http://dx.doi.org/10.31891/2307-5732-2021-301-5-45-51.

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The ways of regulating adhesion of fluoroplastic coatings to metal surfaces are analyzed. It has been established that polymer and metal modification is necessary to increase the adhesive strength and resistance of fluoroplastic coatings. The relative impact of the nature of the metal on the strength of adhesive compounds of polymer – metal is less influenced by the nature of the polymer. The strength of metal compounds is significantly affected by the activation of the metal surface by mechanical treatment (grinding etc.). Various methods of oxidation, etching, metal phosphating are recommended to increase the adhesive strength of fluoropolymer coatings. Method of investigation of adhesion and resistance to scratch damage of coatings is given. The influence of composition and temperature-time conditions of the ground layer formation of the coating on adhesive strength of metal-polymeric compounds was investigated. Detailed operation modes are described. The properties of the ground layer of fluoropolymer Ф-30П are given. The peculiarities of the fluoroplastic coating ground layer formation are outlined. The technology of application of the fluoroplastic coating ground layer on electroplating of metal surfaces has been developed. The coating on the metal surface was done by electrostatic spraying of the ground layer powder at an electric field voltage of 50 kV. The deformation and strength properties of the unstabilized Ф-30П fluoroplast are found to be quite high, which together with high adhesive strength makes it possible to recommend this polymer as primer. It is also advisable to melt the ground layers in more rigid temeperature-time modes (melting temperature 2600 C, duration – 2 hours) in order to ensure higher adhesion strength. The adhesive strength of the Ф-30П fluoroplastic coating can be increased by 10-15% by additional heating at a temperature of 2400 C for two hours. Analysis of the results showed that the resistance of fluoroplastic coatings based on Ф-30П to damage by scratching with an increase in the graphite content of C-1 from 15% to 25% increases by a factor of 2.11, and inserting to coating with 25 mas.% of C-1 graphite additional 3 mas. % of the aerosil-based amino-ergoholozenese – 3.16 times. The additional termoprocessing of these coatings increases the resistance to damage by scratching by 30 per cent. Recommendations on the use of research results for obtaining fluoroplastic coatings with high-adhesion to metal surfaces are given.

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Dilik, Tuncer, Seda Erdinler, Ender Hazır, Hüseyin Koç, and Salim Hiziroglu. "Adhesion Strength of Wood Based Composites Coated with Cellulosic and Polyurethane Paints." Advances in Materials Science and Engineering 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/745675.

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The objective of this study was to determine adhesive strength of particleboard and medium density fiberboard (MDF) finished with two types of paints. Samples were coated using cellulosic and polyurethane based paints. Adhesion strength and coating layer thickness of each sample were measured using pull-off testing method and PosiTector equipment, respectively. The highest adhesion strength value of 3.62 MPa was found for MDF samples coated with paint. Based on the statistical analysis type of substrate significantly influenced overall adhesion strength of the samples while type and layer thickness of paint as well as number of layers applied to the surface of specimens have not affected significantly adhesion resistance of the panels used in this work. It appears that pull-off test can effectively be used to determine and evaluate adhesion strength of the samples considered in the experiments.

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Harriott, Melphine M., and Mairi C. Noverr. "Ability of Candida albicans Mutants To Induce Staphylococcus aureus Vancomycin Resistance during Polymicrobial Biofilm Formation." Antimicrobial Agents and Chemotherapy 54, no. 9 (June 21, 2010): 3746–55. http://dx.doi.org/10.1128/aac.00573-10.

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ABSTRACT Candida albicans and Staphylococcus aureus form vigorous polymicrobial biofilms in serum, which may serve as the source of coinfection in patients. More importantly, S. aureus is highly resistant to vancomycin during polymicrobial biofilm formation, with no decreases in bacterial viability observed with up to 1,600 μg/ml drug. In these mixed-species biofilms, S. aureus preferentially associates with C. albicans hyphae, which express a variety of unique adhesins. We tested C. albicans mutants deficient in transcriptional regulators of morphogenesis (CPH1 and EFG1) and biofilm formation (BCR1) to investigate the role of hyphae in mediating polymicrobial biofilm formation. These mutants also have reduced expression of hypha-specific adhesins. The ability to form polymicrobial biofilms correlated with the ability to form hyphae in these mutants. However, only mutants that could adhere to the abiotic surface could induce S. aureus vancomycin resistance, regardless of the presence of hyphae. In examining factors that may mediate interspecies adhesion, we found that the C. albicans ALS family of adhesins (Als1 to Als7 and Als9) was not involved, and neither was the hypha-specific adhesin Hwp1. Therefore, polymicrobial biofilm formation and subsequent antibiotic resistance is a multifactorial process that may require a unique combination of fungal and/or bacterial adhesins.

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Ventura, Inês, Victoria Harman, Robert J. Beynon, and Romana Santos. "Glycoproteins Involved in Sea Urchin Temporary Adhesion." Marine Drugs 21, no. 3 (February 24, 2023): 145. http://dx.doi.org/10.3390/md21030145.

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Biomedical adhesives, despite having been used increasingly in recent years, still face a major technological challenge: strong adhesion in wet environments. In this context, biological adhesives secreted by marine invertebrates have appealing characteristics to incorporate into new underwater biomimetic adhesives: water resistance, nontoxicity and biodegradability. Little is still known about temporary adhesion. Recently, a transcriptomic differential analysis of sea urchin Paracentrotus lividus tube feet pinpointed 16 adhesive/cohesive protein candidates. In addition, it has been demonstrated that the adhesive secreted by this species is composed of high molecular weight proteins associated with N-Acetylglucosamine in a specific chitobiose arrangement. As a follow-up, we aimed to investigate which of these adhesive/cohesive protein candidates were glycosylated through lectin pulldowns, protein identification by mass spectroscopy and in silico characterization. We demonstrate that at least five of the previously identified protein adhesive/cohesive candidates are glycoproteins. We also report the involvement of a third Nectin variant, the first adhesion-related protein to be identified in P. lividus. By providing a deeper characterization of these adhesive/cohesive glycoproteins, this work advances our understanding of the key features that should be replicated in future sea urchin-inspired bioadhesives.

Journal articles on the topic 'Adhesion resistance'

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