Relevant bibliographies by topics / Pili de type IVa

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Pili de type IVa'

Author: Grafiati
Published: 25 May 2024
Last updated: 31 July 2025

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Journal articles on the topic "Pili de type IVa"

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Evans, Katy J., Carey Lambert, and R. Elizabeth Sockett. "Predation by Bdellovibrio bacteriovorus HD100 Requires Type IV Pili." Journal of Bacteriology 189, no. 13 (2007): 4850–59. http://dx.doi.org/10.1128/jb.01942-06.

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ABSTRACT Early electron microscopy and more recent studies in our laboratory of Bdellovibrio bacteriovorus cells indicated the presence of narrow fibers at the nonflagellar pole of this unusual predatory bacterium. Analysis of the B. bacteriovorus HD100 genome showed a complete set of genes potentially encoding type IV pili and an incomplete gene set for Flp pili; therefore, the role of type IV pili in the predatory life cycle of B. bacteriovorus HD100 was investigated. Alignment of the predicted PilA protein with known type IV pilins showed the characteristic conserved N terminus common to ty
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Harvey, Hanjeong, Marc Habash, Francisca Aidoo, and Lori L. Burrows. "Single-Residue Changes in the C-Terminal Disulfide-Bonded Loop of the Pseudomonas aeruginosa Type IV Pilin Influence Pilus Assembly and Twitching Motility." Journal of Bacteriology 191, no. 21 (2009): 6513–24. http://dx.doi.org/10.1128/jb.00943-09.

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ABSTRACT PilA, the major pilin subunit of Pseudomonas aeruginosa type IV pili (T4P), is a principal structural component. PilA has a conserved C-terminal disulfide-bonded loop (DSL) that has been implicated as the pilus adhesinotope. Structural studies have suggested that DSL is involved in intersubunit interactions within the pilus fiber. PilA mutants with single-residue substitutions, insertions, or deletions in the DSL were tested for pilin stability, pilus assembly, and T4P function. Mutation of either Cys residue of the DSL resulted in pilins that were unable to assemble into fibers. Ala
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de Bentzmann, Sophie, Marianne Aurouze, Geneviève Ball, and Alain Filloux. "FppA, a Novel Pseudomonas aeruginosa Prepilin Peptidase Involved in Assembly of Type IVb Pili." Journal of Bacteriology 188, no. 13 (2006): 4851–60. http://dx.doi.org/10.1128/jb.00345-06.

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ABSTRACT Several subclasses of type IV pili have been described according to the characteristics of the structural prepilin subunit. Whereas molecular mechanisms of type IVa pilus assembly have been well documented for Pseudomonas aeruginosa and involve the PilD prepilin peptidase, no type IVb pili have been described in this microorganism. One subclass of type IVb prepilins has been identified as the Flp prepilin subfamily. Long and bundled Flp pili involved in tight adherence have been identified in Actinobacillus actinomycetemcomitans, for which assembly was due to a dedicated machinery enc
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Wairuri, Charles K., Jacquie E. van der Waals, Antoinette van Schalkwyk, and Jacques Theron. "Ralstonia solanacearum Needs Flp Pili for Virulence on Potato." Molecular Plant-Microbe Interactions® 25, no. 4 (2012): 546–56. http://dx.doi.org/10.1094/mpmi-06-11-0166.

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Type IV pili are virulence factors in various bacteria. Several subclasses of type IV pili have been described according to the characteristics of the structural prepilin subunit. Although type IVa pili have been implicated in the virulence of Ralstonia solanacearum, type IVb pili have not previously been described in this plant pathogen. Here, we report the characterization of two distinct tad loci in the R. solanacearum genome. The tad genes encode functions necessary for biogenesis of the Flp subfamily of type IVb pili initially described for the periodontal pathogen Aggregatibacter actinom
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Chlebek, Jennifer L., Hannah Q. Hughes, Aleksandra S. Ratkiewicz, et al. "PilT and PilU are homohexameric ATPases that coordinate to retract type IVa pili." PLOS Genetics 15, no. 10 (2019): e1008448. http://dx.doi.org/10.1371/journal.pgen.1008448.

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Hughes, Hannah Q., Nicholas D. Christman, Triana N. Dalia, Courtney K. Ellison, and Ankur B. Dalia. "The PilT retraction ATPase promotes both extension and retraction of the MSHA type IVa pilus in Vibrio cholerae." PLOS Genetics 18, no. 12 (2022): e1010561. http://dx.doi.org/10.1371/journal.pgen.1010561.

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Diverse bacterial species use type IVa pili (T4aP) to interact with their environments. The dynamic extension and retraction of T4aP is critical for their function, but the mechanisms that regulate this dynamic activity remain poorly understood. T4aP are typically extended via the activity of a dedicated extension motor ATPase and retracted via the action of an antagonistic retraction motor ATPase called PilT. These motors are generally functionally independent, and loss of PilT commonly results in T4aP hyperpiliation due to undeterred pilus extension. However, for the mannose-sensitive hemagg
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Iruegas, Ruben, Katharina Pfefferle, Stephan Göttig, Beate Averhoff, and Ingo Ebersberger. "Feature architecture aware phylogenetic profiling indicates a functional diversification of type IVa pili in the nosocomial pathogen Acinetobacter baumannii." PLOS Genetics 19, no. 7 (2023): e1010646. http://dx.doi.org/10.1371/journal.pgen.1010646.

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The Gram-negative bacterial pathogen Acinetobacter baumannii is a major cause of hospital-acquired opportunistic infections. The increasing spread of pan-drug resistant strains makes A. baumannii top-ranking among the ESKAPE pathogens for which novel routes of treatment are urgently needed. Comparative genomics approaches have successfully identified genetic changes coinciding with the emergence of pathogenicity in Acinetobacter. Genes that are prevalent both in pathogenic and a-pathogenic Acinetobacter species were not considered ignoring that virulence factors may emerge by the modification
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Orndorff, Paul E., Aditya Devapali, Sarah Palestrant, et al. "Immunoglobulin-Mediated Agglutination of and Biofilm Formation by Escherichia coli K-12 Require the Type 1 Pilus Fiber." Infection and Immunity 72, no. 4 (2004): 1929–38. http://dx.doi.org/10.1128/iai.72.4.1929-1938.2004.

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ABSTRACT The binding of human secretory immunoglobulin A (SIgA), the primary immunoglobulin in the gut, to Escherichia coli is thought to be dependent on type 1 pili. Type 1 pili are filamentous bacterial surface attachment organelles comprised principally of a single protein, the product of the fimA gene. A minor component of the pilus fiber (the product of the fimH gene, termed the adhesin) mediates attachment to a variety of host cell molecules in a mannose inhibitable interaction that has been extensively described. We found that the aggregation of E. coli K-12 by human secretory IgA (SIgA
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Dahlgren, U. I., S. Ahlstedt, and L. A. Hanson. "The localization of the antibody response in milk or bile depends on the nature of the antigen." Journal of Immunology 138, no. 5 (1987): 1397–402. http://dx.doi.org/10.4049/jimmunol.138.5.1397.

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Abstract Immunization in the Peyer's patches of rats with horse spleen ferritin or Escherichia coli 06 carrying type 1 pili resulted in an IgA antibody response detected in milk and bile and an IgG and IgM antibody response in serum, milk, and bile. The IgA antibody response to type 1 pili was as a mean 5.0-fold higher in milk than in bile. In contrast IgA antibody activity to 06 LPS was as a mean 6.3-fold higher in bile than in milk. The IgA antibodies to ferritin were randomly distributed between milk and bile. The IgG and IgM antibody activity to all three antigens studied were higher in th
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Quigley, Bernard R., Matthew Hatkoff, David G. Thanassi, Mahamoudou Ouattara, Zehava Eichenbaum, and June R. Scott. "A Foreign Protein Incorporated on the Tip of T3 Pili in Lactococcus lactis Elicits Systemic and Mucosal Immunity." Infection and Immunity 78, no. 3 (2009): 1294–303. http://dx.doi.org/10.1128/iai.01037-09.

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ABSTRACT The use of Lactococcus lactis to deliver a chosen antigen to the mucosal surface has been shown to elicit an immune response in mice and is a possible method of vaccination in humans. The recent discovery on Gram-positive bacteria of pili that are covalently attached to the bacterial surface and the elucidation of the residues linking the major and minor subunits of such pili suggests that the presentation of an antigen on the tip of pili external to the surface of L. lactis might constitute a successful vaccine strategy. As a proof of principle, we have fused a foreign protein (the E
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Dissertations / Theses on the topic "Pili de type IVa"

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Zatakia, Hardik M. "Characterization of symbiotically important processes in Sinorhizobium meliloti." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/56652.

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Bacteria perform biological nitrogen fixation (BNF) which leads to conversion of N2 to ammonia. One of the best studied models of BNF is the symbiotic association of Sinorhizobium meliloti - Medicago sativa (alfalfa). Since alfalfa is a major source of animal feed and the fourth largest crop grown in the USA, enhanced understanding of this symbiosis can have implications for increasing crop yields, reducing environmental contamination and food costs. Studies discussed here focus on two symbiotically important bacterial traits, type IVb pili and chemotaxis. Chapter 2 characterizes S. meliloti t
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Berry, Jamie. "Structural characterization of type IV pilus biogenesis proteins." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/structural-characterization-of-type-iv-pilus-biogenesis-proteins(1e0d7119-58d5-4e5d-839d-daef8deb76ab).html.

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Type IV pili, or fimbriae, are long, thin proteinaceous appendages found on the surface of many well-known pathogens. They mediate a variety of important virulence functions for the organism, such as twitching motility, biofilm formation, uptake of genetic material and host cell recognition and adhesion. Pili are formed by the rapid polymerization and de-polymerization of the pilin subunit, and this is orchestrated by a complex macromolecular machine which spans the bacterial cell envelope, requiring a variety of gene products. The type IV pilus biogenesis system is closely related to the bact
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Jacobsen, Theis. "Structure and assembly of bacterial type IV filaments unravelled by an integrative approach." Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS146.

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La superfamille des filaments de type IV (TFF) est un groupe de machines moléculaires localisées dans la membrane des bactéries et des archées. Ces machines associent des polymères protéiques de manière non-covalente appelés des pili, qui s’étendent depuis la cellule pour réaliser plusieurs fonctions qui ont évolué spécifiquement pour s’adapter à des organismes hôtes différents. La superfamille TFF comprend le système de sécrétion de type II (T2SS) et les pili de type IVa (T4aP). Le T2SS induit la sécrétion de substrats chez les bactéries Gram-négatives. Ces substrats sont en général des enzym
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Luna-Rico, Areli-Noemi. "Enterobacterial type IV pili : structure, assembly and molecular function." Thesis, Sorbonne Paris Cité, 2018. https://theses.md.univ-paris-diderot.fr/LUNARICO_Areli_4_va_20180629.pdf.

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Nombreuses espèces bactériennes présentent des fibres à leur surface qui leur permettent d’interagir avec leur environnement. Les pili de type 4 (PT4) sont des fibres longues, fines et flexibles, impliquées dans des fonctions multiples telles que l'adhérence, la motilité, la sécrétion, l'import d'ADN et la formation des biofilms. Ils sont composés de milliers de copies de sous-unité majeure de piline et sont assemblés par un complexe protéique localisé dans l'enveloppe bactérienne. Dans cette étude, nous nous sommes intéressés aux PT4 chez Escherichia coli entérohémorragique (EHEC) de sérotype
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Seow, Vui Yin. "DNA Transformation and Type IV Pili in Neisseria gonorrhoeae." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS049.

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La résistance aux antibiotiques, évidente chez des souches telles que Neisseria gonorrhoeae, est une crise sanitaire mondiale. Il est vital de comprendre son mécanisme, en particulier la transformation naturelle par les Pili de type IV de ces bactéries. Bien qu'elle ait été découverte en 1928, la transformation naturelle n'a toujours pas été élucidée. La dépendance de Neisseria gonorrhoeae à l'égard des Pili de type IV en fait un modèle idéal pour l'étude de ce processus.Cette thèse se lance dans une exploration intensive des processus complexes de transformation de l'ADN au sein de Neisseria
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Alteri, Christopher. "Novel Pili of Mycobacterium tuberculosis." Diss., Tucson, Arizona : University of Arizona, 2005. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1276%5F1%5Fm.pdf&type=application/pdf.

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Couchman, Edward. "Investigating the Type IV pili of Clostridium difficile and Clostridium sordellii." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/48055.

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Type IV pili (T4P) are the only type of bacterial pili known to be produced by both Gram-negative and Gram-positive organisms. Though the main pilus shaft consists primarily of only one protein (the major pilin), T4P are unusual in their complexity, requiring multiple (10 or more) different protein components for assembly. Like most types of pili, T4P often function as virulence factors. In particular, T4P frequently operate as adhesins, enabling bacteria on which they are present to stick to each other (to form a biofilm or suchlike) or to adhere directly to host cells. Many T4P systems are a
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Hendrick, William Anthony. "Molecular Analysis of Type IV Pilus Assembly in Clostridium perfringens." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/81696.

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Clostridium perfringens is a Gram-positive anaerobe capable of causing disease in humans and many animals. C. perfringens is able to move across surfaces in a manner that is dependent on growth and type IV pili. Type IV pili are filaments that can be extended away from the cell by rapid polymerization, and retracted by depolymerization. Furthering the understanding of the initial and final energetic states of the pilins will reveal insights into possible mechanisms of type IV pilus assembly. Toward that end, a pilin was purified from the Gram-negative pathogen Pseudomonas aeruginosa and inco
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Amerighi, Fulvia. "Impact of S.pneumoniae type-I pilus and its subunits on bacterial adherence to human epithelial cells." Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3422591.

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S. pneumoniae is a human pathogen able to cause both invasive and non-invasive diseases as well as to colonize the nasopharyngeal tract of children and adults. Despite pneumococcus is a leading cause of morbidity and mortality worldwide, the pathogenic mechanisms exploited by S. pneumoniae are not yet clear. A critical step is colonization of the nasopharynx and the initial interaction of pneumococci with host cells. Recently, pili were discovered in gram-positive bacteria, mediating critical host-bacterial interactions, such as adherence to the epithelium, biofilm formation and translocation
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Hartman, Andrea H. "Use of an Inducible Promoter to Characterize Type IV Pili Homologues in Clostridium perfringens." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/76874.

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Researchers of <i>Clostridium perfringens</i>, a Gram-positive anaerobic pathogen, were lacking a tightlyregulated, inducible promoter system in their genetic toolbox. We constructed a lactose-inducible plasmid-based system utilizing the transcriptional regulator, BgaR. Using the <i>E. coli</i> reporter GusA, we characterized its induction in three different strains of <i>C. perfringens</i>. We then used a newly-developed mutation system to create in-frame deletion mutants in three genes with homology to Type IV pilins, and we used the promoter system described above to complement the mutants.
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Books on the topic "Pili de type IVa"

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Thrall, Elizabeth Simmons. Spectroscopic Studies of Abiotic and Biological Nanomaterials: Silver Nanoparticles, Rhodamine 6G Adsorbed on Graphene, and c-Type Cytochromes and Type IV Pili in Geobacter sulfurreducens. [publisher not identified], 2012.

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Chiang, Poney Che. Molecular investigation of the role of type 4 pili ATPases involved in twitching motility of Pseudomonas aeruginosa. 2005.

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Sybert, Virginia P. Disorders of Epidermal Appendages. Oxford University Press, 2012. http://dx.doi.org/10.1093/med/9780195397666.003.0003.

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Hair – Alopecias – Loose Anagen Hair – Male Pattern Baldness – Marie Unna Syndrome – Hirsutism – Gingival Fibromatosis and Hypertrichosis – Hypertrichosis Lanuginosa Congenita – Leprechaunism – Localized Hypertrichosis – Polycystic Ovarian Disease – Hair Shaft Abnormalities, Isolated – Monilethrix – Pili Annulati – Pili Torti – Pili Trianguli Et Canaliculi – Trichorrhexis Invaginata – Trichorrhexis Nodosa – Woolly Hair – Hair Shaft Abnormalities, Syndromic – Menkes Disease – Trichodentoosseous Syndrome – Trichorhinophalangeal Syndrome – Trichothiodystrophy – Nails – Nail Disorders, Isolated –
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Sybert, Virginia P. Disorders of Epidermal Appendages. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780190276478.003.0003.

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Chapter 3 starts by covering conditions of the hair, including Alopecias (Loose Anagen Hair, Male Pattern Baldness, and Marie Unna Syndrome), Hirsutism (Gingival Fibromatosis and Hypertrichosis, Hypertrichosis Lanuginosa Congenita, Leprechaunism, and Localized Hypertrichosis), and Hair Shaft Abnormalities (including Monilethrix, Pili Annulati, Pili Torti, Pili Trianguli Et Canaliculi, Trichorrhexis Invaginata, Trichorrhexis Nodosa, Woolly Hair, Menkes Disease, Trichodentoosseous Syndrome, Trichorhinophalangeal Syndrome, and Trichothiodystrophy). It then covers conditions of the nails, includin
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Book chapters on the topic "Pili de type IVa"

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Orndorff, Paul E. "Escherichia coli Type 1 Pili." In Molecular Genetics of Bacterial Pathogenesis. ASM Press, 2014. http://dx.doi.org/10.1128/9781555818340.ch7.

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Muschiol, Sandra, Marie-Stephanie Aschtgen, Priyanka Nannapaneni, and Birgitta Henriques-Normark. "Gram-Positive Type IV Pili and Competence." In Protein Secretion in Bacteria. ASM Press, 2019. http://dx.doi.org/10.1128/9781683670285.ch11.

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Craig, Lisa, and Tuba Altindal. "Purification of Type IV Pili and Pilin Subunits." In Neisseria gonorrhoeae. Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9496-0_7.

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Gonzalez Rivera, Alba Katiria, and Katrina T. Forest. "Shearing and Enrichment of Extracellular Type IV Pili." In Methods in Molecular Biology. Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-7033-9_25.

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Robert O’Neill, J., and Rowan W. Parks. "Surgical Resection of a Type IVa Choledochal Cyst." In Case-Based Lessons in the Management of Complex Hepato-Pancreato-Biliary Surgery. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50868-9_16.

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Shoji, Mikio, Satoshi Shibata, Mariko Naito, and Koji Nakayama. "Transport and Polymerization of Porphyromonas gingivalis Type V Pili." In Periodontal Pathogens. Springer US, 2020. http://dx.doi.org/10.1007/978-1-0716-0939-2_7.

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Marrs, Carl F. "Type 4 Pili in the Families Moraxellaceae and Neisseriaceae." In Molecular Genetics of Bacterial Pathogenesis. ASM Press, 2014. http://dx.doi.org/10.1128/9781555818340.ch9.

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Izadi-Pruneyre, Nadia, Yasaman Karami, and Michael Nilges. "Structure and Dynamics of Type 4a Pili and Type 2 Secretion System Endopili." In Subcellular Biochemistry. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-58843-3_21.

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Pooley, Linda, and Miles D. Houslay. "A Novel Form of Type-IVA cAMP Phosphodiesterase found in rat brain." In Signalling Mechanisms — from Transcription Factors to Oxidative Stress. Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79675-3_7.

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Skotnicka, Dorota, and Lotte Søgaard-Andersen. "Type IV Pili-Dependent Motility as a Tool to Determine the Activity of c-di-GMP Modulating Enzymes in Myxococcus xanthus." In c-di-GMP Signaling. Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-7240-1_13.

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Conference papers on the topic "Pili de type IVa"

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GLOCKSHUBER, RUDOLF. "ASSEMBLY OF FILAMENTOUS TYPE 1 PILI FROM UROPATHOGENIC ESCHERICHIA COLI STRAINS." In 23rd International Solvay Conference on Chemistry. WORLD SCIENTIFIC, 2014. http://dx.doi.org/10.1142/9789814603836_0040.

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Chen, Feng-Jung, Chia-Han Chan, Kuo-Liang Liu, et al. "Uncoiling mechanism of Klebsiella pneumoniae type 3 pili measured by using optical tweezers." In NanoScience + Engineering, edited by Kishan Dholakia and Gabriel C. Spalding. SPIE, 2007. http://dx.doi.org/10.1117/12.733097.

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Asgarian, Behrouz, Alireza Fiouz, and Ali Shakeri Talarposhti. "Incremental Dynamic Analysis Considering Pile-Soil-Structure Interaction for the Jacket Type Offshore Platforms." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57273.

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Nonlinear response of piles is the most important source of potentially nonlinear behavior of offshore platforms due to earthquake excitations. It is often necessary to perform dynamic analysis of offshore platforms that accounts for soil nonlinearity, discontinuity condition at pile soil interfaces, energy dissipation through soil radiation damping and structural nonlinear behaviors of the piles. Incremental dynamic analysis is an analysis method that has recently emerged as a promising tool for thoroughly evaluating the seismic performance of structures. It involves subjecting a structural m
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Asgarian, Behrouz, Mohammad Amin Assareh, and Pejman Alanjari. "Nonlinear Behavior of Single Piles in Jacket Type Offshore Platforms Using Incremental Dynamic Analysis." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57148.

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Offshore platforms are some of those structures which are built to withstand environmental and accidental loads during oil exploitation operation. One of the most usual types of these platforms is the Jacket Type Offshore Platform (JTOP) which can be divided into three important parts, which are Deck, Jacket, and piles. In order to increase the safety, particular attention should be paid to earthquake excitations which are directly applied to the piles of these structures. Nonlinearity in piles and buckling of the struts are important issues which have to be considered by the designers of offs
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Facchina, Giulia, Alessandro Amaddeo, Sonia Khirani, et al. "Retrospective analysis of sleep breathing disorders in mucopolysaccharidosis type IVA." In ERS International Congress 2018 abstracts. European Respiratory Society, 2018. http://dx.doi.org/10.1183/13993003.congress-2018.pa4590.

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Morikawa, Akira, Ryo Ishii, Hajime Noto, Atsushi Fukayama, and Takao Nakamura. "Determining most suitable listener backchannel type for speaker's utterance." In IVA '22: ACM International Conference on Intelligent Virtual Agents. ACM, 2022. http://dx.doi.org/10.1145/3514197.3549619.

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Sulaiman, R. A. R., R. P. Aji, N. M. Prakoso, et al. "Variant identification of exon 11 of galactosamine (N-acetyl)-6-sulfatase (GALNS) gene in mucopolysaccharidosis type IVA patients in Indonesia." In THE 2ND SCIENCE AND MATHEMATICS INTERNATIONAL CONFERENCE (SMIC 2020): Transforming Research and Education of Science and Mathematics in the Digital Age. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0042042.

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Barreiro, Jose A., John S. Knowles, Carl R. Johnson, Iain D. Gordon, and Lene K. Gjerde. "Successful Application of a Reinforced Composite Mat Pill Technology for Lost Circulation Control in the Norwegian Continental Shelf." In SPE/IADC International Drilling Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/204062-ms.

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Abstract An operator in the Norwegian continental shelf (NCS) required sufficient zonal isolation around a casing shoe to accommodate subsequent targeted injection operations. Located in the Ivar Aasen field, and classified as critical, the well had a 9 ⅝-in. casing shoe set in the depleted Skagerrak 2 reservoir. The lost circulation risk was high during cementing because the Hugin formation, located above the reservoir, contained 40 m [~ 131.2 ft] of highly porous and permeable sandstone. During previous operations in the field, lost circulation was observed before and during the casing runni
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Cao Bayout, Lucile, François Migeon, and Florian Sarrasin. "Assessment of New Materials in Unbonded Flexible Pipes." In Offshore Technology Conference. OTC, 2022. http://dx.doi.org/10.4043/31811-ms.

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Abstract The present paper is related to the assessment of new materials for use in unbonded flexibles pipes designed and manufactured as per API 17J. Unbonded flexible pipes are a key solution in the oil and gas industry and are used as subsea static flowlines and dynamic risers to convey various types of fluids at high pressure, high temperature and in deep-water environment. In view of the increasingly challenging applications it shall withstand, the unbonded flexible pipe is complex in terms of design, fabrication and installation aspects and leads to a generally tailor-made design. Conseq
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Cao Bayout, Lucile, François Migeon, and Florian Sarrasin. "Assessment of New Materials in Unbonded Flexible Pipes." In Offshore Technology Conference. OTC, 2022. http://dx.doi.org/10.4043/31811-ms.

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Abstract The present paper is related to the assessment of new materials for use in unbonded flexibles pipes designed and manufactured as per API 17J. Unbonded flexible pipes are a key solution in the oil and gas industry and are used as subsea static flowlines and dynamic risers to convey various types of fluids at high pressure, high temperature and in deep-water environment. In view of the increasingly challenging applications it shall withstand, the unbonded flexible pipe is complex in terms of design, fabrication and installation aspects and leads to a generally tailor-made design. Conseq
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Reports on the topic "Pili de type IVa"

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Morrison, Mark, and Joshuah Miron. Molecular-Based Analysis of Cellulose Binding Proteins Involved with Adherence to Cellulose by Ruminococcus albus. United States Department of Agriculture, 2000. http://dx.doi.org/10.32747/2000.7695844.bard.

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At the beginning of this project, it was clear that R. albus adhered tightly to cellulose and its efficient degradation of this polysaccharide was dependent on micromolar concentrations of phenylacetic acid (PAA) and phenylpropionic acid (PPA). The objectives for our research were: i) to identify how many different kinds of cellulose binding proteins are produced by Ruminococcus albus; ii) to isolate and clone the genes encoding some of these proteins from the same bacterium; iii) to determine where these various proteins were located and; iv) quantify the relative importance of these proteins
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