Relevant bibliographies by topics / Thin pellicles

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Academic literature on the topic 'Thin pellicles'

Author: Grafiati
Published: 28 May 2022
Last updated: 29 May 2022

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Journal articles on the topic "Thin pellicles"

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Qin, Boyang, Chenyi Fei, Bruce Wang, Howard A. Stone, Ned S. Wingreen, and Bonnie L. Bassler. "Hierarchical transitions and fractal wrinkling drive bacterial pellicle morphogenesis." Proceedings of the National Academy of Sciences 118, no. 20 (May 10, 2021): e2023504118. http://dx.doi.org/10.1073/pnas.2023504118.

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Bacterial cells can self-organize into structured communities at fluid–fluid interfaces. These soft, living materials composed of cells and extracellular matrix are called pellicles. Cells residing in pellicles garner group-level survival advantages such as increased antibiotic resistance. The dynamics of pellicle formation and, more generally, how complex morphologies arise from active biomaterials confined at interfaces are not well understood. Here, using Vibrio cholerae as our model organism, a custom-built adaptive stereo microscope, fluorescence imaging, mechanical theory, and simulations, we report a fractal wrinkling morphogenesis program that differs radically from the well-known coalescence of wrinkles into folds that occurs in passive thin films at fluid–fluid interfaces. Four stages occur: growth of founding colonies, onset of primary wrinkles, development of secondary curved ridge instabilities, and finally the emergence of a cascade of finer structures with fractal-like scaling in wavelength. The time evolution of pellicle formation depends on the initial heterogeneity of the film microstructure. Changing the starting bacterial seeding density produces three variations in the sequence of morphogenic stages, which we term the bypass, crystalline, and incomplete modes. Despite these global architectural transitions, individual microcolonies remain spatially segregated, and thus, the community maintains spatial and genetic heterogeneity. Our results suggest that the memory of the original microstructure is critical in setting the morphogenic dynamics of a pellicle as an active biomaterial.
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Qureshi, Osama, Hira Sohail, Andrew Latos, and Janice L. Strap. "The effect of phytohormones on the growth, cellulose production and pellicle properties of Gluconacetobacter xylinus ATCC 53582." Acetic Acid Bacteria 2, no. 1s (February 26, 2013): 7. http://dx.doi.org/10.4081/aab.2013.s1.e7.

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<em>Gluconacetobacter xylinus</em> is a plant-associated bacterium best studied for its cellulose production. Bacterial cellulose is important in facilitating plant-microbe interactions but little is known about the effect that exogenous phytohormones have on bacterial cellulose synthesis or the growth of <em>G. xylinus</em>. We characterized the growth, development and effect on pellicle characteristics caused by exogenous indole-3- acetic acid (IAA), gibberellic acid (GA), abscisic acid (ABA) and zeatin (Z) over a range of concentrations (1 nM to 100 &mu;M). These phytohormones are plant growth regulators known to be involved plant development including fruit ripening and stress tolerance. Each of these hormones stimulated <em>G. xylinus</em> growth and influenced its pellicle characteristics. Exogenous IAA had the greatest effect on <em>G. xylinus</em> pellicles. Growth in IAA produced thin pellicles with very little cellulose. In general, pellicle wet weight was inversely proportional to the bacterial cellulose yield when cultures were grown in the presence of ABA, suggesting ABA influenced pellicle density and hydration. The crystallinity index, CI (IR) of cellulose produced in the presence of each phytohormone over a variety of concentrations was determined by Fourier transform infrared spectroscopy. The observed effect on cellulose crystallinity was concentration and hormone dependent. GA caused the greatest alterations in crystallinity with the highest CI (IR)=0.94 at 1 &mu;M and the lowest CI (IR)=0.47 at 500 nM. Endogenous production of hormones by <em>G. xylinus</em> was investigated by high performance liquid chromatography of extracts prepared from both cell pellets and culture supernatants. We found <em>G. xylinus</em> synthesized GA, ABA and Z but did not produce IAA.
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Skiba, Ekaterina A., Nadezhda A. Shavyrkina, Vera V. Budaeva, Anastasia E. Sitnikova, Anna A. Korchagina, Nikolay V. Bychin, Evgenia K. Gladysheva, et al. "Biosynthesis of Bacterial Cellulose by Extended Cultivation with Multiple Removal of BC Pellicles." Polymers 13, no. 13 (June 28, 2021): 2118. http://dx.doi.org/10.3390/polym13132118.

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Extended cultivation with multiple removal of BC pellicles is proposed herein as a new biosynthetic process for bacterial cellulose (BC). This method enhances the BC surface area by 5–11 times per unit volume of the growth medium, improving the economic efficiency of biosynthesis. The resultant BC gel-films were thin, transparent, and congruent. The degree of polymerization (DP) and elastic modulus (EM) depended on the number of BC pellicle removals, vessel shape, and volume. The quality of BC from removals II–III to VII was better than from removal I. The process scale-up of 1:40 by volume increased DP by 1.5 times and EM by 5 times. A fact was established that the symbiotic Medusomyces gisevii Sa-12 was adaptable to exhausted growth medium: the medium was able to biosynthesize BC for 60 days, while glucose ran low at 24 days. On extended cultivation, DP and EM were found to decline by 39–64% and 57–65%, respectively. The BC gel-films obtained upon removals I–VI were successfully trialed in experimental tension-free hernioplasty.
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Lee, Kwangjoo, Steffen Jockusch, Nicholas J. Turro, Roger H. French, Robert C. Wheland, M. F. Lemon, Andre M. Braun, et al. "157 nm Pellicles (Thin Films) for Photolithography: Mechanistic Investigation of the VUV and UV-C Photolysis of Fluorocarbons." Journal of the American Chemical Society 127, no. 23 (June 2005): 8320–27. http://dx.doi.org/10.1021/ja0440654.

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Wang, Yu. "The investigation of producing bacterial cellulose fibres through hand-spun." E3S Web of Conferences 131 (2019): 01052. http://dx.doi.org/10.1051/e3sconf/201913101052.

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Nanocellulose fibres can be hand-spun from different intermediate states, such as nanocellulose paper and filter cake, which are made from the BC suspension as well as wet pellicle (WP) and dry pellicle (DP) from BC pellicles. In this study, it can be concluded that increasing the hanging weight can increase the Young’s modulus and the tensile strength of fibres. Nanofibres produced from BC pellicles as raw material have better performance than those made from BC suspension. The best properties obtained from the fibres produced from wet pellicles and suspended to a 100g hanging weight upon drying are Young’s modulus (33.8 GPa), tensile strength (610 MPa) and elongation at break (3.6%).
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Kersken, H., J. Vilmart-Seuwen, M. Momayezi, and H. Plattner. "Filamentous actin in Paramecium cells: mapping by phalloidin affinity labeling in vivo and in vitro." Journal of Histochemistry & Cytochemistry 34, no. 4 (April 1986): 443–54. http://dx.doi.org/10.1177/34.4.2419395.

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In living Paramecium cells, microinjected rhodaminyl (R)-phalloidin rapidly labels a thin cortical layer. This can be more clearly resolved with microinjected and fixed cells (allowing for better resolution) as well as with isolated pellicles (surface membrane complexes with trichocysts, microfilaments, and mitochondria attached). Labeling of a longitudinal and perpendicular pattern, reflecting the relief of the cell surface, and labeling of ciliary basal bodies then becomes clearly visible. Other structures labeled by R-phalloidin are the surfaces of food vacuoles of different sizes and, although inconsistently, the borders of the buccal cavity. Small acidic compartments (as identified by acridine orange fluorescence vital staining), probably representing acidosomes and small lysosomes, were not labeled. F-actin on food vacuole surfaces may somehow be involved in intracellular transport or fusion processes. No labeling was observed in association with the osmoregulatory system (contractile vacuoles and their ampullae and radial canals). The specificity of in vivo labeling obtained was supported by the abolition of R-phalloidin labeling when isolated pellicles were pretreated with unlabeled phalloidin or with DNAse I. It was also possible to discriminate among different layers of R-phalloidin binding in the cortex by detaching different layers of the surface complex from each other. Since localization of F-actin in ciliates has raised a considerable amount of dispute in the past, we also repeated all these experiments with RITC-labeled HMM, but we obtained essentially the same labeling pattern as with R-phalloidin. Ciliary basal bodies therefore clearly contain some F-actin. Our data shed some light on aspects of surface structuring and motility in these cells.
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Ahn, S. J., H. S. Kho, S. W. Lee, and D. S. Nahm. "Roles of Salivary Proteins in the Adherence of Oral Streptococci to Various Orthodontic Brackets." Journal of Dental Research 81, no. 6 (June 2002): 411–15. http://dx.doi.org/10.1177/154405910208100611.

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Knowledge of salivary pellicles on orthodontic brackets provides a better understanding of microbial adherence. The aim of this study was to analyze the effects of bracket pellicles on the adherence of Streptococcus gordonii and Streptococcus mutans. Bracket pellicles were formed by the incubation of 4 kinds of orthodontic brackets with unstimulated whole saliva for 2 hrs, and analyzed by electrophoresis, immunodetection, and amino acid analysis. Binding assays were then performed by the incubation of tritium-labeled streptococci with the pellicle-transfer blots and orthodontic brackets. The results showed that low-molecular-weight mucin, α-amylase, secretory IgA, acidic proline-rich proteins, and cystatins adhered to all kinds of brackets, though the amino acid composition of pellicles differed between bracket types. Some of these proteins increased the binding of S. gordonii to saliva-coated brackets. However, salivary pellicles decreased the binding of S. mutans. Collectively, salivary pellicles were found to play a significant role in the initial adhesion of oral streptococci to orthodontic brackets.
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Dickinson, Michelle E., and Adrian B. Mann. "Nanomechanics and morphology of salivary pellicle." Journal of Materials Research 21, no. 8 (August 1, 2006): 1996–2002. http://dx.doi.org/10.1557/jmr.2006.0248.

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Acquired salivary pellicle is a thin protein-rich film formed by the adsorption of saliva onto teeth. It plays important roles in lubrication during mastication and protecting the teeth from chemical attack. Pellicle can become colonized by bacteria to form dental plaque which can lead to dental caries if the bacteria are acidogenic. Abrasive polishing with a dentrifice is used periodically to remove the pellicle from teeth. Pellicle can interact with dietary polyphenolic compounds (tannins) to create extrinsic stains on the tooth surface. The staining can modify the pellicle's mechanical properties and change its morphology resulting in a “squeaky” feeling when the tongue is rubbed over the teeth. Atomic force microscopy imaging and nanoscale mechanical measurements show that unstained pellicle has a dense undulating morphology and is a surprisingly stiff, viscoelastic solid. In contrast, tannin-stained pellicle has fewer but larger surface undulations and exhibits substantial viscous creep.
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Madsen, Jonas S., Yu-Cheng Lin, Georgia R. Squyres, Alexa Price-Whelan, Ana de Santiago Torio, Angela Song, William C. Cornell, Søren J. Sørensen, Joao B. Xavier, and Lars E. P. Dietrich. "Facultative Control of Matrix Production Optimizes Competitive Fitness in Pseudomonas aeruginosa PA14 Biofilm Models." Applied and Environmental Microbiology 81, no. 24 (October 2, 2015): 8414–26. http://dx.doi.org/10.1128/aem.02628-15.

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ABSTRACTAs biofilms grow, resident cells inevitably face the challenge of resource limitation. In the opportunistic pathogenPseudomonas aeruginosaPA14, electron acceptor availability affects matrix production and, as a result, biofilm morphogenesis. The secreted matrix polysaccharide Pel is required for pellicle formation and for colony wrinkling, two activities that promote access to O2. We examined the exploitability and evolvability of Pel production at the air-liquid interface (during pellicle formation) and on solid surfaces (during colony formation). Although Pel contributes to the developmental response to electron acceptor limitation in both biofilm formation regimes, we found variation in the exploitability of its production and necessity for competitive fitness between the two systems. The wild type showed a competitive advantage against a non-Pel-producing mutant in pellicles but no advantage in colonies. Adaptation to the pellicle environment selected for mutants with a competitive advantage against the wild type in pellicles but also caused a severe disadvantage in colonies, even in wrinkled colony centers. Evolution in the colony center produced divergent phenotypes, while adaptation to the colony edge produced mutants with clear competitive advantages against the wild type in this O2-replete niche. In general, the structurally heterogeneous colony environment promoted more diversification than the more homogeneous pellicle. These results suggest that the role of Pel in community structure formation in response to electron acceptor limitation is unique to specific biofilm models and that the facultative control of Pel production is required for PA14 to maintain optimum benefit in different types of communities.
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Taira, Even A., Talita M. S. Ventura, Luiza P. S. Cassiano, Cintia M. S. Silva, Tatiana Martini, Aline L. Leite, Daniela Rios, Ana Carolina Magalhães, and Marília Afonso Rabelo Buzalaf. "Changes in the Proteomic Profile of Acquired Enamel Pellicles as a Function of Their Time of Formation and Hydrochloric Acid Exposure." Caries Research 52, no. 5 (2018): 367–77. http://dx.doi.org/10.1159/000486969.

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Objective: Changes in the protein profile of acquired enamel pellicles (AEP) formed in vivo over different time periods were evaluated after the application of hydrochloric acid (HCl). Methods: Nine subjects were submitted to dental prophylaxis with pumice. After 3 or 120 min, the teeth were isolated with cotton rolls and 50 μL of 0.1 M HCl (pH 1.0), 0.01 M HCl (pH 2.0), or deionized water were applied on the buccal surface of the teeth for 10 s. The AEP was then collected using an electrode filter paper presoaked in 3% citric acid. After protein extraction, the samples were submitted to reverse-phase liquid chromatography coupled to mass spectrometry (nano LC-ESI-MS/MS). Label-free quantification was performed (Protein Lynx Global Service software). Results: A total of 180 proteins were successfully identified in the AEP samples. The number of identified proteins increased with the time of pellicle formation. Only 4 proteins were present in all the groups (isoforms of IgA, serum albumin, and statherin). The greatest number of proteins identified uniquely in one of the groups was obtained for the groups treated with HCl after 2 h of pellicle formation (approx. 50 proteins). Conclusion: Proteins resistant to removal by HCl, such as serum albumin and statherin, were identified even in the short-term AEP. In addition, 120-min pellicles present many proteins that are resistant to removal by HCl. This suggests an increase in protection against intrinsic acids with the time of pellicle formation, which should be evaluated in future studies.
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Dissertations / Theses on the topic "Thin pellicles"

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Дудецький, Д. П., and Д. М. Кондрахова. "Кристалічна структура і фазовий склад плівкових феромагнітних матеріалів на основі заліза і кобальту." Thesis, Видавництво СумДУ, 2008. http://essuir.sumdu.edu.ua/handle/123456789/4339.

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Проценко, Сергій Іванович, Сергей Иванович Проценко, Serhii Ivanovych Protsenko, and М. В. Бібик. "Реалізація технологій машинного зору за допомогую віртуальних інструментів LabVIEW." Thesis, Видавництво СумДУ, 2008. http://essuir.sumdu.edu.ua/handle/123456789/4336.

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Метою даної роботи було розробити систему для автоматизації експерименту при дослідженні тензорезистивних властивостей тонких плівок. При цитуванні документа, використовуйте посилання http://essuir.sumdu.edu.ua/handle/123456789/4336
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Ayche, Kenza. "Propriétés mécaniques et structurales d'encapsulants polymères utilisés en microélectronique : effet de la température et de l'humidité." Thesis, Le Mans, 2017. http://www.theses.fr/2017LEMA1005/document.

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L’engouement mondial pour les appareils nomades et la course à la sobriété énergétique font de la diminution de la taille des systèmes microélectroniques (MEMS) un enjeu majeur pour les prochaines années. Les micro batteries au lithium sont aujourd'hui le moyen le plus efficace pour stocker et alimenter des dispositifs avec une très forte densité énergétique. Les incorporer dans des cartes de crédit comportant un écran et des touches intégrés est l’un des défis que relèvent les multinationales comme ST Micro Electronics. Ces micro batteries contiennent cependant du lithium métallique qui peut s'avérer très dangereux quand il est en contact avec de l’eau ou de l’air humide. Ainsi, afin de protéger les composants à une exposition à l’humidité, une encapsulation de l’ensemble de la batterie est nécessaire. L'encapsulation polymère a l’avantage, comparativement à d’autres matériaux, de présenter un faible coût de mise en forme et un faible poids. Cependant, de tels systèmes d'encapsulation sont aujourd'hui insuffisants pour garantir une durée de vie de plusieurs années des composants car en présence d’humidité ou d’une variation de température importante la tenue mécanique des assemblages peut être fragilisée. L'objectif de la thèse est donc de réaliser et d'étudier le comportement mécanique et structural d’assemblage de couches minces de polymères et de métaux en température et en humidité. Deux types de polymères ont été choisis pour ce projet :1. Le chlorure de polyvinylidène (PVDC), un polymère commercial très utilisé pour ses bonnes propriétés barrières à l'eau 2. Un oligomère acrylate reticulable par voie thermique et UV synthétisé au sein de l'IMMM
The increasing number of mobile devices and the race to energy sobriety make the decrease of the size of microelectronic systems (MEMS) a major challenge. Today, Lithium micro batteries are currently the best solution for high-power-and-energy applications. Incorporate them into credit cards containing a screen or associate them to electronic sensors for the supervision is the challenge which raises international companies such as ST Microelectronics. However, these micro batteries contain some lithium metal which can be dangerous if the metallic lithium is in contact with water or humid air. In addition, the substance can spontaneously ignite in the contact of the humidity. So, in order to avoid the problems of safety, we absolutely have to protect the lithium contained in our micro batteries using an encapsulation layer. Polymeric encapsulation has the advantage, compared with other materials (ceramic, metal), to present a moderate cost of shaping and a low weight. However, such systems of encapsulation are today insufficient to guarantee a satisfactory life cycle of components. Indeed, in the presence of humidity or of a too important temperature variation, the mechanical assemblies can be weakened and engender an irreparable break. The objective of the thesis is therefore to realize and study the mechanical and structural behavior of assembly of thin layers of polymers and metals in temperature and humidity.Two types of polymers were selected for this project:1. Polyvinylidene chloride (PVDC), a commercial polymer widely used for its good barrier properties to water.2. A thermally and UV-crosslinkable acrylate oligomer synthesized in the IMMM
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MacDonald, J. Scott. "The effects of temperature and relative humidity on stresses in thin film pellicles." 2001. http://catalog.hathitrust.org/api/volumes/oclc/50073391.html.

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Books on the topic "Thin pellicles"

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Pellicer, Miquel, and Eva Wegner. Quantitative Research in MENA Political Science. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190882969.003.0016.

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In this chapter, Miquel Pellicer and Eva Wegner make the case for employing quantitative analysis in the study of the Middle East and North Africa. The chapter recognizes the difficulties in obtaining good and reliable data, but employs examples of recent methodological innovations to discuss how such difficulties can be reduced. The authors also point out that quantitative methods in isolation cannot do justice to the political and social complexities of the region and in-depth qualitative knowledge is required to make sense of raw data.
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Baer, James A. Anarchists and Immigration from Spain to Argentina. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252038990.003.0003.

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This chapter explores the Spanish anarchist movement and its link to emigration through the lives of Antonio Pellicer Paraire, José Prat, and Gregorio Inglán y Lafarga. Their travels, experiences, and influence link the anarchist movements in Spain and in Argentina. Some Italian and Spanish and a few French immigrants had been familiar with or participants in European anarchist movements. Many had struggled with internecine conflicts before coming to Argentina and brought these quarrels with them. But in a new environment with mixtures of peoples and ideas from many areas, they began to integrate different notions into a truly Argentine anarchism that became very dynamic at the turn of the twentieth century.
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Conference papers on the topic "Thin pellicles"

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Lucas, Kevin, Joseph S. Gordon, Will Conley, Mazen Saied, Scott Warrick, Mike Pochkowski, Mark D. Smith, Craig West, Franklin Kalk, and Jan Pieter Kuijten. "Optical issues of thin organic pellicles in 45-nm and 32-nm immersion lithography." In 26th Annual BACUS Symposium on Photomask Technology, edited by Patrick M. Martin and Robert J. Naber. SPIE, 2006. http://dx.doi.org/10.1117/12.686741.

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Kuo, Yue, Jiang Lu, Jun-Yen Tewg, and Paul A. Zimmerman. "Passivation of the 157-nm pellicle with nanometer thin films." In Photomask Technology, edited by Kurt R. Kimmel and Wolfgang Staud. SPIE, 2003. http://dx.doi.org/10.1117/12.517506.

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Alina-Nicoleta, Paraschiv, Dima Milica, Diaconu Aurelia, Enache Viorel, and Fătu Viorel. "PRELIMINARY RESULTS ON THE INFLUENCE OF THE F414 BIOLOGICAL PRODUCT ON SOME PHYSIOLOGICAL INDEXES FOR PEACHES GROWN UNDER THERMO-HYDRIC STRESS." In GEOLINKS Conference Proceedings. Saima Consult Ltd, 2021. http://dx.doi.org/10.32008/geolinks2021/b1/v3/39.

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On the peach species, Springold variety, research was conducted on the influence of the F414 biological product on some physiological indexes and processes carried out on the foliar level, the area of culture being characterized by an accentuated thermo-hydric stress during the summer. Photosynthetic gas exchange, foliar transpiration and stomatal conductance were determined with the portable LC PRO + apparatus, and the leaf water forms were determined gravimetrically, the results obtained being correlated with the meteorological data from the vegetation period. Applying the F414 to the Springold variety resulted in the formation of a pellicle on the surface of the leaves, which, together with the action of the thermo-hydric stress specific to the area, caused stomate closure, reduction of CO2 supply, photosynthesis values being considerably lower compared to the control variant. As for foliar transpiration, the F414 product had a positive effect, the pellicle formed on the surface of the leaves, reducing the amount of water lost to the foliage. The application of this product has positively influenced drought resistance of the Springold variety, the percentages of the bound water being higher (5.1%) compared to the control variant (3.96%).
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Kim, Jaehwan, and Yi Chen. "Cellulose Electro-Active Paper for Biomedical Applications." In ASME 2010 First Global Congress on NanoEngineering for Medicine and Biology. ASMEDC, 2010. http://dx.doi.org/10.1115/nemb2010-13017.

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In our early work, cellulose has been discovered as a smart material. This newly discovered material is termed as electro-active paper (EAPap) that has merits in terms of lightweight, flexible, dryness, biodegradable, biocompatible, easy to chemically modify and cheap [1]. The actuation principle of cellulose EAPap actuator is known to be a combination of piezoelectric effect and ion migration effect. Since this new material is biodegradable and biocompatible, there are a lot of possible biomedical applications. This paper presents bacterial cellulose composites made by blending chitosan, poly(ethylene glycol) and gelatin for potential biomedical application of tissue engineering scaffold and would dressing material. The bacterial cellulose composites were successfully prepared by immersing wet bacterial cellulose pellicle in to chitosan, PEG or gelatin solutions followed by freeze-drying. The products look like a foam structure. Cell adhesion studies for these composites were carried out using 3T3 fibroblast cells. They showed much better biocompatibility than pure bacterial cellulose. Also, the concept of smart bandage is explained, which can come up with medical treatment layer of cellulose, sensing layer, antenna layer and integration of these layers. Issues in developing smart bandage are addressed in this paper.
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