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Bibliographies thématiques / Sponge replication

Littérature scientifique sur le sujet « Sponge replication »

Auteur : Grafiati

Publié le 14 mars 2023

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Articles de revues sur le sujet "Sponge replication"

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Sutygina, Alina, Ulf Betke et Michael Scheffler. « Manufacturing of Open-Cell Aluminium Foams : Comparing the Sponge Replication Technique and Its Combination with the Freezing Method ». Materials 15, n^o 6 (15 mars 2022) : 2147. http://dx.doi.org/10.3390/ma15062147.

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The manufacturing of aluminium foams with a total porosity of 87% using the sponge replication method and a combination of the sponge replication and freezing technique is presented. Foams with different cell counts were prepared from polyurethane (PU) templates with a pore count per inch (ppi) of 10, 20 and 30; consolidation of the foams was performed in an argon atmosphere at 650 °C. The additional freezing steps resulted in lamellar pores in the foam struts. The formation of lamellar pores increased the specific surface area by a factor of 1.9 compared to foams prepared by the sponge replication method without freezing steps. The formation of additional lamellar pores improved the mechanical properties but reduced the thermal conductivity of the foams. Varying the pore cell sizes of the PU template showed that—compared to foams with dense struts—the highest increase (~7 times) in the specific surface area was observed in foams made from 10 ppi PU templates. The effect of the cell size on the mechanical and thermal properties of aluminium foams was also investigated.

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Hasmaliza, Mohamad, Musa Siti Naqiah et Ibrahim Norfadhilah. « Effect of the Sponge Used as the Template for the Production of Porous Cordierite ». Advanced Materials Research 858 (novembre 2013) : 56–59. http://dx.doi.org/10.4028/www.scientific.net/amr.858.56.

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Cordierite (2MgO.2Al2O3.5SiO2) is widely used in high temperature applications due to its high melting temperature and high resistance to thermal, chemical and corrosion shock. The use of various structure of cordierite especially porous structure became more popular where its properties can be tailored by controlling the open and closed porosity, cell size distribution and cell morphology. In this study, porous cordierite was synthesized using sol-gel method followed by replication of polymeric sponge method using three different types of polymeric sponge (Type A, B and C). Immersed sponge were then sintered at 1300°C to determine better sponge types to produce porous cordierite. Sponge was characterized using FTIR and porous sample produced were characterized using Scanning Electron Microscope (SEM) and density and porosity testing.

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Sutygina, Betke et Scheffler. « Open-Cell Aluminum Foams by the Sponge Replication Technique ». Materials 12, n^o 23 (21 novembre 2019) : 3840. http://dx.doi.org/10.3390/ma12233840.

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Open-cell aluminum foams were manufactured by a sponge replication technique having a total porosity of ~90%. The influence of the thermal processing conditions such as atmosphere and temperature on the cellular structure, phase composition porosity, thermal conductivity, and compressive strength of the foams was studied. It was found that the thermal processing of aluminum foams in Ar at temperatures up to 800 °C led to aluminum foams with a reduced strut porosity, a lower amount of aluminum oxide, a higher thermal conductivity, and a higher compression strength, compared to foams thermally processed in air. These results were explained by the lower amount of aluminum oxide after thermal processing of the foams.

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Li, J. P., J. R. Wijn, Clemens A. van Blitterswijk et K. de Groot. « Comparison of Porous Ti₆Al₄V Made by Sponge Replication and Directly 3D Fiber Deposition and Cancellous Bone ». Key Engineering Materials 330-332 (février 2007) : 999–1002. http://dx.doi.org/10.4028/www.scientific.net/kem.330-332.999.

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The present investigation gives a comparison of the structure and properties of porous Ti6Al4V made by sponge replication (Sponge Ti) and directly 3D fiber deposition (D3DF Ti) and cancellous bone. Although the macrostructure of these two materials differs, their microstructure seems to be similar. Both scaffolds reveal an open pore structure, while D3DF Ti shows a fairly regular open pore structure, sponge Ti6Al4V exhibit an irregular open pore structure similar to that of cancellous bone. The mechanisms resulting in mechanical properties like stiffness or strength are, accordingly, different. The compressive strength and E’ modulus of Ti6Al4V scaffold are higher than that of cancellous bone,. The permeability results show both Ti6Al4V scaffolds are quite comparable with cancellous bone.

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Soy, Ugur, et Adem Demir. « Fabrication and Optimization of Boron Carbide Foams by Polymeric Sponge Replication ». Emerging Materials Research 9, n^o 2 (1 juin 2020) : 1–8. http://dx.doi.org/10.1680/jemmr.20.00046.

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Soy, Ugur, et Adem Demir. « AlSi10Mg alloy infiltration into porous SiC structures manufactured by sponge replication ». Emerging Materials Research 9, n^o 3 (1 septembre 2020) : 868–76. http://dx.doi.org/10.1680/jemmr.20.00196.

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Chaari, Kamel. « Elaboration And Characterization Of Macroporous Bioceramics Using Polymeric Sponge Replication Method ». Advanced Materials Letters 11, n^o 11 (1 novembre 2020) : 20111578. http://dx.doi.org/10.5185/amlett.2020.111578.

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Sutygina, A., U. Betke, G. Hasemann et M. Scheffler. « Manufacturing of Open-Cell Metal Foams by the Sponge Replication Technique ». IOP Conference Series : Materials Science and Engineering 882 (29 août 2020) : 012022. http://dx.doi.org/10.1088/1757-899x/882/1/012022.

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Wang, Chunli, Hongjie Chen, Xiangdong Zhu, Zhanwen Xiao, Kai Zhang et Xingdong Zhang. « An improved polymeric sponge replication method for biomedical porous titanium scaffolds ». Materials Science and Engineering : C 70 (janvier 2017) : 1192–99. http://dx.doi.org/10.1016/j.msec.2016.03.037.

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Choudhary, Abhisek, Swadesh K. Pratihar, Ashish K. Agrawal et Shantanu K. Behera. « Macroporous SiOC Ceramics with Dense Struts by Positive Sponge Replication Technique ». Advanced Engineering Materials 20, n^o 3 (9 novembre 2017) : 1700586. http://dx.doi.org/10.1002/adem.201700586.

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Thèses sur le sujet "Sponge replication"

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Ruvolo, Michael Vincent. « The role and regulation of a checkpoint pathway that coordinates spore development with chromosome replication in bacillus subtilis / ». May be available electronically:, 2008. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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Sayed, Salah Adam Mahyous. « New roles of S.pombe Casein kinase 1 epsilon (Hhp1) in DNA replicatation stress ». Thesis, Bangor University, 2015. https://research.bangor.ac.uk/portal/en/theses/new-roles-of-spombe-casein-kinase-1-epsilon-hhp1-in-dna-replicatation-stress(7da38b1d-ff5d-4903-bb1e-cb64e0f26a85).html.

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Schizosaccharomyces pombe Casein kinase 1 (Hhp1) is a dual-specific kinase phosphorylating serine and threonine residues as well as tyrosine side chains. S. pombe Hhp1 kinase is homologous to Saccharomyces cerevisiae Hrr25, Drosophila double-time (dbt), and mammalian Casein kinase 1-epsilon (CKIε). CK1 enzymes regulate the circadian clock, Wnt (wingless) signalling, cell death, cell cycle progression and DNA repair. How one group of enzymes is able to execute so many functions is still poorly understood, especially because of the large number of isoforms and splice varinants in mammalian cells. This study uses the fission yeast as a model to research the roles of CK1 in the response to broken DNA replication forks. S.pombe Hhp1 is closely related to human CKIε and was previously implicated in DNA repair. A combination of genetic, biochemical and cell biological technologies revealed a novel role of Hhp1 kinase in the regulation of the DNA structure-specific endonuclease Mus81-Eme1. When DNA replication forks break in the presence of the topoisomerase 1 inhibitor camptothecin (CPT), Mus81-Eme1 acts on the broken chromosomes. Hhp1 is predicted to phosphorylate the regulatory subunit Eme1 jointly with the cell cycle regulator Cdc2 and the DNA damage checkpoint kinase Chk1. Genetic tests showed that all three kinases act in the same CPT-response pathway. The recreation of CK1 mutations of the circadian clock (hhp1.R180C, hhp1.P49S, and hhp1.M82I) and of CK1 mutations found in human breast cancers (hhp1.L51Q) in S.pombe Hhp1 revealed that different kinase activity levels are crucial for the regulation of DNA repair and cell cycle progression. While a limited drop in Hhp1 kinase activity, for example by widening its ATP binding site (methionine-84 to glycine), considerably delays the exit from a G2 arrest in the presence of damaged replication forks (CPT), it does not significantly impair DNA repair and cell survival. Only a dramatic drop in kinase activity, for example by replacing the active site residue lysine-40 with an arginine side chain, affects DNA repair and cell survival. How different kinase activity levels can have distinct biological outputs is discussed in the context of how CK1 recognises primed and acidic phosphorylation motifs. Taken together, the outcomes of this work imply that the complex phenotypes of CK1 mutations in the circadian clock or in cancer cells are caused by mutations which impact differently on its kinases activity.

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Chapitres de livres sur le sujet "Sponge replication"

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Haack, David, et Rudolph Olson. « Processing, Microstructure and Properties of Reticulated Vitreous Carbon Foam Manufactured via the Sponge Replication Technique ». Dans Advances in Bioceramics and Porous Ceramics V, 175–85. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118217504.ch20.

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Li, J. P., J. R. Wijn, Clemens A. van Blitterswijk et K. de Groot. « Comparison of Porous Ti₆Al₄V Made by Sponge Replication and Directly 3D Fiber Deposition and Cancellous Bone ». Dans Key Engineering Materials, 999–1002. Stafa : Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-422-7.999.

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You, Chang Kook, et Suk Young Kim. « Preparation of Ceramic Scaffold by Sponge Replication Method ». Dans Manuals in Biomedical Research, 219–29. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812772114_0021.

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Bartlett, John G. « Clostridium difficile ». Dans Oxford Textbook of Medicine, 800–803. Oxford University Press, 2010. http://dx.doi.org/10.1093/med/9780199204854.003.070623_update_001.

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Clostridium difficile is a Gram-positive spore-forming anaerobic bacillus found in the environment. Its spores are part of the colonic flora in about 2 to 3% of healthy adults, with colonization rates increasing during hospitalization to 20 to 40%. Disease occurs when the organism shifts to its replicating vegetative form with toxin (A and B) production, this typically happening when there is inhibition of the competing colonic flora by antibiotics. ...

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Eyre, David W., et Mark H. Wilcox. « Clostridium difficile ». Dans Oxford Textbook of Medicine, sous la direction de Christopher P. Conlon, 1115–20. Oxford University Press, 2020. http://dx.doi.org/10.1093/med/9780198746690.003.0128.

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Clostridium difficile (recently renamed as Clostridioides difficile) is a Gram-positive spore-forming anaerobic bacillus that is ubiquitous in nature, and particularly common in healthcare environments. Its spores are part of the colonic flora in about 2–3% of healthy adults, with colonization rates increasing, typically up to 10–20%, during hospitalization. Disease occurs when the organism shifts from quiescent spores to replicating vegetative cells with toxin (A and B) production; this happens when there is inhibition of the resident colonic flora (gut microbiome) by prescribed antibiotics, although cases can occur when no such precipitant is identified. C. difficile infection is now recognized as the most important bacterial enteric pathogen in wealthier countries, epidemics, and outbreaks of which are common, most notoriously now due to the ribotype 027 (NAP-1) strain that is associated with more severe disease and poor outcomes.

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« Whirling Disease : Reviews and Current Topics ». Dans Whirling Disease : Reviews and Current Topics, sous la direction de RONALD P. HEDRICK et MANSOUR EL-MATBOULI. American Fisheries Society, 2002. http://dx.doi.org/10.47886/9781888569377.ch4.

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<em>ABSTRACT. Myxobolus cerebralis </em>possesses unique phenotypic and genotypic characteristics when compared with other histozoic parasites from the phylum Myxozoa. The parasite infects the cartilage and thereby induces a serious and potentially lethal disease in salmonid fish. Comparisons of the small subunit ribosomal DNA (ssu rDNA) sequences of <em>M. cerebralis </em>to other myxozoans demonstrate that the parasite has evolved separately from other <em>Myxobolus </em>spp. that may appear in cartilage or nervous tissues of the fish host. <em>Myxobolus cerebralis </em>has a complex life cycle involving two hosts and numerous developmental stages that may divide by mitosis, endogeny, or plasmotomy, and, at one stage, by meiosis. In the salmonid host, the parasite undergoes extensive migration from initial sites of attachment to the epidermis, through the nervous system, to reach cartilage, the site where sporogenesis occurs. During this migration, parasite numbers may increase by replication. Sporogenesis is initiated by autogamy, a process typical of pansporoblastic myxosporean development that involves the union of the one cell (pericyte) with another (sporogonic). Following this union, the sporogonic cell will give rise to all subsequent cells that differentiate into the lenticular shaped spore with a diameter of approximately 10 µm. This spore or myxospore is an environmentally resistant stage characterized by two hardened valves surrounding two polar capsules with coiled filaments and a binucleate sporoplasm cell. In the fish, these spores are found only in cartilage where they reside until released from fish that die or are consumed by other fish or fish-eating animals (e.g., birds). Spores reaching the aquatic sediments can be ingested and hatch in susceptible oligochaete hosts. The released sporoplasm invades and then resides between cells of the intestinal mucosa. In contrast to the parasite in the fish host, the parasite in the oligochaete undergoes the entire developmental cycle in this location. This developmental cycle involves merogony, gametogamy or the formation of haploid gametes, and sporogony. The actinosporean spores, formed at the culmination of this development, are released into the lumen of the intestine, prior to discharging into the aquatic environment. The mechanisms underlying the complex development of <em>M. cerebralis</em>, and its interactions with both hosts, are poorly understood. Recent advances, however, are providing insights into the factors that mediate certain phases of the infection. In this review, we consider known and recently obtained information on the taxonomy, development, and life cycle of the parasite.

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« multiple donors. Three women had normal pregnancies and deliveries at term. Several groups have replicated this work with spouse leukocytes and successful deliveries result in more than 50% of the women treated. Crohn's Disease Crohn's disease is an inflammatory condition of the gastrointestinal tract which presents with diarrhea and crampy abdominal pain. Recurrence of disease following surgery is common -nearly half of the patients will develop symptoms of recurrence within ten years of surgical resection of all diseased bowel. Immune function is abnormal and patients are often treated with immunosuppressive steroids. Transfused patients have significantly decreased total lymphocyte and t-cell counts following surgery despite being clinically well. Increasing numbers of units of blood received are associated with progressively lower numbers of lymphocytes at follow-up. Several groups have studied the effect of blood transfusion on the outcome Crohn's disease because the immunosuppressive effects of transfusion might benefit patients in the same way steroids affect the course to the disease. Most of the studies observed that untransfused patients exhibited higher rates of recurrence than transfused patients (37-40). The studies suggest that transfusion may influence the course of diseases which are thought to have an immune or autoimmune basis and clinically respond to steroids. Crohn's disease patients with more severe disease, those with lower hemoglobins and serum albumins, undergoing resection of more bowel, should have higher recurrence rates. Yet, these patients when transfused have recurrence rates comparable to untransfused patients with higher hemoglobins and albumins and less bowel resected. Wound Healing It has recently been recognized that lymphocytes contribute to wound healing which is primarily mediated by macrophages. Lymphocytes secrete lymphokines which enhance fibroblast replication, migration and collagen synthesis. In vivo depletion of lymphocytes impairs skin wound healing. Since transfusions inhibit lymphocyte function, transfusion-induced inhibition of lymphocyte function should lead to impaired wound healing (41). Rats undergoing ileocolic resection with primary anastomosis and transfusion with saline, syngeneic or allogeneic blood were sacrificed three and seven days following surgery and the bursting pressure of the anastomosis measured. Bursting pressure was significantly lower following transfusion with syngeneic or allogeneic blood in comparison to saline. Hydroxyproline content of the anastomoses was reduced and anastomotic abscesses were common in the transfused animals. This study clearly implicates blood transfusion in impaired wound healing. D iabetes In man, insulin dependent diabetes mellitus is associated with decreases in both the number and functional activity of suppresser T lymphocytes. In the Bio-Breeding rat, diabetes develops when the animals develop pancreatic insulitis, suggesting a cell-mediated immune pathogenesis. Diabetes is prevented in these animals by treating them with immunosuppressive agents such as anti-lymphocyte serum, steroids, cyclosporin, irradiation, neonatal thymectomy, or blood transfusion (42). » Dans Transfusion Immunology and Medicine, 299. CRC Press, 1995. http://dx.doi.org/10.1201/9781482273441-28.

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