scholarly journals Relationship between Anti-Wrinkle Property of Cotton Fabrics and Crosslinking Properties of Glycosyl Polyaldehydes and Polyuronic Acids Finishing Agents: A Molecular Simulation Study

2021 ◽  
Vol 11 (22) ◽  
pp. 10994
Author(s):  
Jiangfei Lou ◽  
Dan Wang ◽  
Jiugang Yuan ◽  
Xuerong Fan
Keyword(s):  
Molecular Simulation ◽  
Diffusion Rate ◽  
Retention Rates ◽  
Cross Linking ◽  
Reactive Groups ◽  
Polyuronic Acid ◽  
Finishing Agent ◽  
The Relationship ◽  
Strength Retention ◽  
Molecular Radius

In this paper, monosaccharide (glucose and fructose), disaccharide (sucrose and trehalose), trisaccharide (raffinose) and tetrasaccharide (stachyose) were selected as the research objects and the glycosyl polyaldehydes and glycosyl polyuronic acid anti-wrinkle finishing agents were prepared via selective oxidation. The anti-wrinkle properties of their finished fabrics were analyzed, the molecular radius, the number of reactive groups, the number of reaction sites and the number of rotatable bonds of the finishing agent were calculated to evaluate its diffusion rate and crosslinking characteristics inside the cellulose. Through molecular simulation, the number of possible conformations of the anti-wrinkle finishing agent with the single cross-linked state was calculated, and the distance between different cross-linking points was measured, and the relationship between the effective cross-linking radius and the anti-wrinkle performance was studied. The results showed that trehalose polyaldehydes, raffinose polyaldehydes, trehalose polyuronic acid, and raffinose polyuronic acid finished fabrics had an excellent anti-wrinkle property, the strength retention rates of the fabrics were all above 68%, and the whiteness index was above 70. The smaller the molecular radius was, the easier the finishing agent was to diffuse into the cellulose. The most suitable crosslinking radius of glycosyl finishing agent was 3.5–6.0 Å.

Study on the Durability of Fluorinated Water and Oil Repellent Finishing by Contact Angle Method

2012 ◽  
Vol 482-484 ◽  
pp. 1294-1297
Author(s):  
Dian Wei Zhang ◽  
Yong Zhu Cui ◽  
Yan Ling Sui
Keyword(s):  
Contact Angle ◽  
Curing Temperature ◽  
Cross Linking ◽  
Optimum Process ◽  
Curing Time ◽  
Repellent Property ◽  
Finishing Agent ◽  
Oil Repellent ◽  
Angle Method

In this paper, fluorinated water and oil repellent finishing agent was mixed with auxiliary agents and the durability of fabrics treated with the finishing agent was investigated. The water and oil repellent property was discussed and evaluated by contact angle method. The results showed that under the same conditions, adding 0.4% cross-linking agent could make the contact angle of the treated fabric higher than untreated, and the durable-washing property of the fabric was excellent and the durability of fluorinated water and oil repellent finishing agent got improved greatly. The optimum process was that the dosage of water and oil repellent finishing agent was 50g/L, the dosage of cross-linking agent was 4g/L, curing temperature was 160 °C and curing time was 90s.

scholarly journals A Review on Surface-Functionalized Cellulosic Nanostructures as Biocompatible Antibacterial Materials

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Mandana Tavakolian ◽  
Seid Mahdi Jafari ◽  
Theo G. M. van de Ven
Keyword(s):  
Surface Modification ◽  
In Vivo Studies ◽  
Hydroxyl Groups ◽  
Chemical Surface ◽  
Antibacterial Materials ◽  
Chemical Surface Modification ◽  
Reactive Groups ◽  
Surface Modified ◽  
The Relationship

Abstract As the most abundant biopolymer on the earth, cellulose has recently gained significant attention in the development of antibacterial biomaterials. Biodegradability, renewability, strong mechanical properties, tunable aspect ratio, and low density offer tremendous possibilities for the use of cellulose in various fields. Owing to the high number of reactive groups (i.e., hydroxyl groups) on the cellulose surface, it can be readily functionalized with various functional groups, such as aldehydes, carboxylic acids, and amines, leading to diverse properties. In addition, the ease of surface modification of cellulose expands the range of compounds which can be grafted onto its structure, such as proteins, polymers, metal nanoparticles, and antibiotics. There are many studies in which cellulose nano-/microfibrils and nanocrystals are used as a support for antibacterial agents. However, little is known about the relationship between cellulose chemical surface modification and its antibacterial activity or biocompatibility. In this study, we have summarized various techniques for surface modifications of cellulose nanostructures and its derivatives along with their antibacterial and biocompatibility behavior to develop non-leaching and durable antibacterial materials. Despite the high effectiveness of surface-modified cellulosic antibacterial materials, more studies on their mechanism of action, the relationship between their properties and their effectivity, and more in vivo studies are required.

scholarly journals ONE-TWO PUNCH OF HIGH WAGES AND EMPOWERING PRACTICES FOR MAINTAINING CARE NETWORKS IN NURSING HOMES

2019 ◽  
Vol 3 (Supplement_1) ◽  
pp. S559-S560
Author(s):  
Katherine Kennedy ◽  
John R Bowblis ◽  
Katherine M Abbott
Keyword(s):  
Retention Rate ◽  
Retention Rates ◽  
Nursing Assistant ◽  
Certified Nursing Assistant ◽  
Facility Level ◽  
High Level ◽  
Relationship Of ◽  
The Relationship ◽  
Linear Regressions

Abstract Stabilizing certified nursing assistant (CNA) employment is necessary for maintaining care networks and providing high quality of care for nursing home (NH) residents. This study’s objective was to examine the relationship of high wages and empowerment practices on CNA retention. We used the 2015 Ohio Biennial Survey to construct a facility-level dataset of 547 NHs and estimated multivariable linear regressions. NHs that provided both high wages and high empowerment were associated with a 12.95 percentage-point improvement in the CNA retention rate (SE = 4.53, t-value = 2.86, p = 0.0045). High wages and a high empowerment score did not have significant effects individually (p > .05). Retention rates were similar between NHs that lacked high wages and scored low on the empowerment scale, and NHs that provided one at a high level but not the other. Implications for better retaining CNAs require multiple empowerment practices combined with high hourly wages.

Effect of cross-linking agents on insulin associated responses in adipocytes

1982 ◽  
Vol 60 (10) ◽  
pp. 987-1000 ◽  
Author(s):  
H. Joseph Goren ◽  
C. Ronald Kahn
Keyword(s):  
Insulin Receptor ◽  
Glucose Transport ◽  
Free Amino ◽  
Glucose Oxidation ◽  
Insulin Binding ◽  
Cross Linking ◽  
Amino Group ◽  
Amino Groups ◽  
Disuccinimidyl Suberate ◽  
Reactive Groups

The effect of 10 bifunctional cross-linking agents and four monofunctional analogues was studied on isolated adipocytes. [125I]Insulin binding and degradation, basal and insulin-stimulated glucose oxidation, and 3-O-methyl glucose uptake were measured. Two cross-linkers, which possess succinimide ester residues (disuccinimidyl suberate and dithiobis(succinimidyl propionate)) and react selectively with amino groups, appeared to react relatively specifically with the insulin receptor. Both produced a slight stimulation of basal glucose transport and metabolism, a marked inhibition of insulin-stimulated glucose transport and metabolism, and a marked decrease in insulin binding. Pretreatment of cells with unlabelled insulin partially blocked the effect of disuccinimidyl suberate, and as has been previously shown, disuccinimidyl suberate cross-linked insulin to its receptor. A monofunctional analogue of these compounds was 100-fold less active in altering cellular metabolic activity. Bisimidates, such as dimethyl suberimidate, dimethyl adipimidate, and dimethyl dithiobispropionimidate, also react with free amino groups but are more hydrophilic. These agents produced similar effects on glucose oxidation as the succinimide esters, but had little or no effect on insulin binding. The effects of these agents are not blocked by insulin and they do not cross-link insulin to its receptor. Mixed bifunctional reagents containing either a succinimide ester or an imidate and a group which reacts with thiols produced effects similar to the cross-linkers containing two succinimide groups or bisimidates, respectively. The bifunctional arylating agents difluorodinitrobenzene and bis(fluoronitrophenyl)sulfone produce marked effects on insulin binding and glucose oxidation at micromolar concentrations, but the monofunctional analogue fluorodinitrobenzene is almost equally active suggesting that with these compounds chemical modifications and not cross-linking was important. With neither the mixed bifunctional reagents, nor the arylating agents, did insulin pretreatment alter the effect of cross-linker and none of these agents cross-linked [125I]insulin to its receptor. These data suggest that the insulin receptor possesses a free amino group in a hydrophobic environment in its active site. A reactive amino group in a hydrophilic environment as well as other reactive groups are also present in some component of the insulin receptor–effector complex. Chemical modification or cross-linking of these functional groups results in an inhibition or mimicking of insulin action. Further study will be required to identify the exact locus of these sites.

The relationship between collagen scaffold cross-linking agents and neutrophils in the foreign body reaction

Biomaterials ◽  
2010 ◽  
Vol 31 (35) ◽  
pp. 9192-9201 ◽  
Author(s):  
Qingsong Ye ◽  
Martin C. Harmsen ◽  
Marja J.A. van Luyn ◽  
Ruud A. Bank
Keyword(s):  
Foreign Body ◽  
Foreign Body Reaction ◽  
Collagen Scaffold ◽  
Cross Linking ◽  
The Relationship

Research of Electrochemistry Measuring System Based on Saliva Glucose

2011 ◽  
Vol 301-303 ◽  
pp. 1139-1144
Author(s):  
Li Ying Jiang ◽  
Li Jie Ren ◽  
Qing Hua Chen ◽  
Guang Zhao Cui
Keyword(s):  
Glucose Oxidase ◽  
Chemical Sensors ◽  
Linear Relation ◽  
Glucose Solution ◽  
Solution Concentration ◽  
Measuring System ◽  
Cross Linking ◽  
Glucose Content ◽  
Relationship Of ◽  
The Relationship

According to the relationship of glucose content in diabetes saliva and blood, the biosensor for detecting saliva glucose was introduced based on electrochemical detecting principle, glucose oxidase was immobilized onto the surface of electrode by glutaraldehyde cross-linking. The measuring system was designed by using potentiostat for amperometric chemical sensors. The characters of the microsystem has been demonstrated with the detection of standard glucose solution concentration of saliva parameter. Compared with the data obtained from the instrument CHI660A, it showed that has a good linear relation in the linear range of 0-2200µmol/L, with the correlation coefficient of 0.9531.

Binding of pp60v-src to membranes: evidence for multiple membrane interactions

1992 ◽  
Vol 70 (10-11) ◽  
pp. 1187-1192 ◽  
Author(s):  
Lauren Silverman ◽  
Catherine T. Sigal ◽  
Marilyn D. Resh
Keyword(s):  
Membrane Binding ◽  
Cross Linking ◽  
Binding Characteristics ◽  
Binding Domains ◽  
Rous Sarcoma ◽  
Subcellular Membrane ◽  
Sarcoma Virus ◽  
The Relationship

Membrane association of pp60v-src, the myristylated transforming protein of Rous sarcoma virus, has been shown to be a receptor-mediated process, which is inhibited by myristylated src peptides containing the N-terminal 11 amino acids of the v-src sequence (MGYsrc). By cross-linking radiolabeled MGYsrc peptide to fibroblast membranes, a 32-kilodalton membrane protein was identified as a candidate src receptor. To elucidate the potential role of p32 in binding pp60v-src, we studied the relationship between binding of MGYsrc peptide and pp60v-src polypeptide to cellular membranes. The subcellular membrane distribution of p32 was distinct from that of pp60v-src in transformed cells. Moreover, under certain defined in vitro conditions, it was possible to inhibit peptide cross-linking to p32 without significantly affecting pp60v-src membrane binding. However, when internal sequences were removed from pp60v-src, the binding characteristics of the src deletion polypeptide and MGYsrc peptide became identical. These data indicate that the presence of internal membrane binding domains influences the interaction of myristylated N-terminal src sequences with p32, and suggest that accessory binding factors might be involved in establishing stable contact between pp60v-src and the membrane phospholipid bilayer.Key words: myristylation, pp60v-src, membrane binding, cross-linking.

scholarly journals Fast anisotropic Mg and H diffusion in wet forsterite

2021 ◽  
Author(s):  
Joshua Muir ◽  
Feiwu Zhang ◽  
Andrew Walker
Keyword(s):  
Density Functional ◽  
Diffusion Rate ◽  
Water Concentration ◽  
Experimental Conditions ◽  
Functional Theory ◽  
Strong Function ◽  
Effect Of Water ◽  
Large Numbers ◽  
Relationship Of ◽  
The Relationship

Mg diffusion, which is important for properties of forsterite such as conductivity and deformation, is a strong function of water content. The mechanism behind this effect, however, has not been fully elucidated. In this study we use Density Functional Theory to predict the diffusivity of 〖(2H)〗_Mg^X and we find that they are around 1000 times slower than H-free Mg vacancies V_Mg^''. In most wet conditions the concentration of 〖(2H)〗_Mg^X is much higher than that of V_Mg^'' and thus the primary effect of water on increasing the Mg-diffusion rate in forsterite is by producing large numbers of H-bearing Mg vacancies. A water induced increase in diffusion rate is predicted to be accompanied by a large increase in diffusional anisotropy primarily in the [001] direction. Using a previously developed model of H distribution in forsterite we predict that the effect of water on Mg diffusion is strongly dependent upon environmental conditions such as pressure or temperature. An exponent (r) describing the relationship of water concentration to Mg diffusion is found to vary between 0.5-1.6 across common experimental conditions with pressure decreasing this exponent and temperature increasing it. With 100 wt. ppm water Mg diffusion rates are predicted to increase by over 2 orders of magnitude at high temperature and low pressure (2000 K, 0 GPa) and by over 3.5 orders of magnitude at low temperature and high pressure (1000 K, 10 GPa) while the anisotropy of diffusion is predicted to increase by ~2/over 5.5 orders of magnitude respectively. A conversion from “dry” to “wet” rheological laws is predicted to occur at <~1 ppm. These results suggest that Mg diffusion in wet forsterite could vary considerably throughout mantle conditions in ways that cannot be captured with a simple one component equation. Finally we considered the effects of the diffusion of H-bearing Mg vacancies on conductivity in forsterite and olivine. We combined our diffusivity results with experimentally determined results for phonon conductivity but this predicted significaly lower conductivities than have been observed experimentally in olivine, particularly at low temperatures (~1000 K). This suggests that the effect of water on olivine conductivity is not primarily due to bulk 〖(2H)〗_Mg^X diffusion and operates via a different unknown mechanism.

scholarly journals Investigating the Relationship between Residence Learning Community Participation and Student Academic Outcomes in a Canadian Institution

2018 ◽  
Vol 9 (2) ◽  
Author(s):  
Justine O Hobbins ◽  
Mildred Eisenbach ◽  
Kerry L Ritchie ◽  
Shoshanah Jacobs
Keyword(s):  
Learning Community ◽  
Graduation Rates ◽  
Academic Outcomes ◽  
The United States ◽  
Retention Rates ◽  
First Year ◽  
Comprehensive University ◽  
Post Secondary ◽  
Residential Living ◽  
The Relationship

This study investigated the relationship between residential living scenario and first year grades, second year retention, and 5-year graduation rates of students at a Canadian comprehensive university. We compared the academic outcomes of students living in residence learning communities (RLCs) to those in other living scenarios (traditional residences and off-campus). RLCs have been shown to be positively associated with student academic outcomes in the United States; however, the data to support RLCs in Canada is non-existent. A longitudinal observational study was conducted to analyse the academic outcomes of a complete cohort of students (n=4805) who lived in RLCs (18%) and non-RLCs (82%). Results indicated that RLC students, on average, achieved higher first year averages, 2nd year retention rates, and 5-year graduation rates relative to non-RLC students, thereby contributing to the goals of post-secondary institutions to attract and retain their students through to graduation. Cette étude examine la relation qui existe entre le scénario où les étudiants vivent en résidence et les notes obtenues en première année d’études, la rétention en deuxième année et l’obtention des diplômes en cinquième année dans une université canadienne polyvalente. Nous avons comparé les résultats académiques d’étudiants qui vivaient dans des communautés d’apprentissage en résidence (CAR) et ceux des étudiants qui vivaient selon d’autres scénarios (résidence traditionnelle et hors campus). Il a été prouvé qu’aux États-Unis, les CAR sont associées favorablement aux résultats académiques des étudiants. Toutefois, les données pour soutenir les CAR au Canada sont inexistantes. Une étude d’observation longitudinale a été menée pour analyser les résultats académiques d’une cohorte complète d’étudiants (n=4805) qui vivaient dans une CAR (18 %) et ceux d’étudiants qui vivaient autrement (82 %). Les résultats ont indiqué qu’en moyenne, les étudiants qui vivaient dans une CAR avaient obtenu de meilleures notes en première année, avaient réalisé un taux de rétention supérieur en deuxième année et un meilleur pourcentage d’obtention de diplômes en cinquième année, par rapport aux étudiants qui ne vivaient pas dans une CAR, ce qui contribue à répondre aux objectifs des établissements d’enseignement post-secondaire d’attirer et de retenir leurs étudiants jusqu’à que ceux-ci obtiennent leur diplôme.

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