12 results on '"Sturtevant D"'
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2. ANALYSIS OF CARBOHYDRATES AND GLYCOCONJUGATES BY MATRIX-ASSISTED LASER DESORPTION/IONIZATION MASS SPECTROMETRY: AN UPDATE FOR 2015-2016.
- Author
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Harvey DJ
- Subjects
- Glycolipids, Lasers, Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization, Carbohydrates, Glycoconjugates
- Abstract
This review is the ninth update of the original article published in 1999 on the application of matrix-assisted laser desorption/ionization (MALDI) mass spectrometry to the analysis of carbohydrates and glycoconjugates and brings coverage of the literature to the end of 2016. Also included are papers that describe methods appropriate to analysis by MALDI, such as sample preparation techniques, even though the ionization method is not MALDI. Topics covered in the first part of the review include general aspects such as theory of the MALDI process, matrices, derivatization, MALDI imaging, fragmentation and arrays. The second part of the review is devoted to applications to various structural types such as oligo- and poly-saccharides, glycoproteins, glycolipids, glycosides and biopharmaceuticals. Much of this material is presented in tabular form. The third part of the review covers medical and industrial applications of the technique, studies of enzyme reactions and applications to chemical synthesis. The reported work shows increasing use of combined new techniques such as ion mobility and the enormous impact that MALDI imaging is having. MALDI, although invented over 30 years ago is still an ideal technique for carbohydrate analysis and advancements in the technique and range of applications show no sign of deminishing. © 2020 Wiley Periodicals, Inc., (© 2021 by John Wiley & Sons Ltd.)
- Published
- 2021
- Full Text
- View/download PDF
3. Type VI secretion system effector proteins: Effective weapons for bacterial competitiveness.
- Author
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Hernandez RE, Gallegos-Monterrosa R, and Coulthurst SJ
- Subjects
- Bacteria genetics, Bacterial Proteins genetics, Protein Transport, Type VI Secretion Systems genetics, Bacteria metabolism, Bacterial Proteins metabolism, Gram-Negative Bacteria metabolism, Type VI Secretion Systems metabolism
- Abstract
The Type VI secretion system (T6SS) is a protein translocation nanomachine widespread among Gram-negative bacteria and used as a means to deliver effectors directly into target bacterial or eukaryotic cells. These effectors have a wide variety of functions within target cells that ultimately help the secreting cell gain a competitive fitness advantage. Here, we discuss the different ways in which these effectors can be delivered by the T6SS and the diverse mechanisms by which they exert their noxious action upon recipient cells. We also highlight the existence of roles for T6SS effectors beyond simply the killing of neighbouring cells., (© 2020 The Authors. Cellular Microbiology published by John Wiley & Sons Ltd.)
- Published
- 2020
- Full Text
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4. Edwardsiella ictaluri evpP is required for colonisation of channel catfish ovary cells and necrosis in anterior kidney macrophages.
- Author
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Kalindamar S, Kordon AO, Abdelhamed H, Tan W, Pinchuk LM, and Karsi A
- Subjects
- Animals, Apoptosis, Bacterial Proteins, Enterobacteriaceae Infections microbiology, Female, Fish Diseases microbiology, Genes, Bacterial, Head Kidney microbiology, Mutation, Oxidative Stress, Type VI Secretion Systems metabolism, Virulence, Edwardsiella ictaluri physiology, Ictaluridae microbiology, Macrophages microbiology, Macrophages physiology, Necrosis microbiology, Ovary microbiology
- Abstract
Edwardsiella ictaluri is a Gram-negative facultative anaerobe that can survive inside channel catfish phagocytes. E. ictaluri can orchestrate Type VI Secretion System (T6SS) for survival in catfish macrophages. evpP encodes one of the T6SS translocated effector proteins. However, the role of evpP in E. ictaluri is still unexplored. In this work, we constructed an E. ictaluri evpP mutant (EiΔevpP) and assessed its survival under complement and oxidative stress. Persistence of EiΔevpP in catfish as well as attachment and invasion in catfish macrophage and ovary cells were determined. Further, virulence of EiΔevpP in catfish and apoptosis it caused in macrophages were explored. EiΔevpP behaved same as wild type (EiWT) under complement and oxidative stress in complex media, whereas oxidative stress affected mutant's survival significantly in minimal media (p < .05). Persistence of EiΔevpP in live catfish and uptake and survival inside peritoneal macrophages were similar. The attachment and invasion capabilities of EiΔevpP in catfish ovary cells were significantly less than that of EiWT (p < .05). Although EiΔevpP showed reduced attenuation in catfish, causing decreased catfish mortality compared with EiWT (44.73% vs. 67.53%), this difference was not significant. The apoptosis assay using anterior kidney macrophages indicated that the number of live macrophages exposed to EiΔevpP was significantly higher compared with EiWT exposed macrophages at 24-hr post-treatment (p < .05). However, there were no significant differences in the early and late apoptosis. Remarkably, necrosis in EiΔevpP exposed macrophages was significantly less than that of EiWT exposed macrophages at 24 hr (p < .05). Our results demonstrated that evpP is required for colonisation of catfish ovary cells and increased apoptosis and necrosis in anterior kidney macrophages., (© 2019 John Wiley & Sons Ltd.)
- Published
- 2020
- Full Text
- View/download PDF
5. Bile acid and bile acid transporters are involved in the pathogenesis of acute hepatopancreatic necrosis disease in white shrimp Litopenaeus vannamei.
- Author
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Kumar R, Ng TH, Chang CC, Tung TC, Lin SS, Lo CF, and Wang HC
- Subjects
- Animals, Biofilms growth & development, Carrier Proteins genetics, Computational Biology, Gene Expression Profiling, Hepatopancreas microbiology, Membrane Glycoproteins genetics, Necrosis microbiology, Penaeidae genetics, Vibrio parahaemolyticus genetics, Bile Acids and Salts metabolism, Carrier Proteins metabolism, Hepatopancreas pathology, Membrane Glycoproteins metabolism, Necrosis veterinary, Penaeidae microbiology, Vibrio Infections veterinary, Vibrio parahaemolyticus pathogenicity
- Abstract
Acute hepatopancreas necrosis disease is a recently emerged shrimp disease that is caused by virulent strains of Vibrio parahaemolyticus. Although AHPND poses a serious threat to the shrimp industry, particularly in Asia, its underlying pathogenic mechanisms are not well characterized. Since a previous transcriptomic study showed upregulation of the apical sodium bile acid transporter (LvASBT), our objective here was to explore the role of bile acids and bile acid transporters in AHPND infection. We confirmed that mRNA expression of LvASBT was upregulated in the stomach of AHPND-infected shrimps. Bile acid concentrations were also higher in the stomach of AHPND-infected shrimp and correlated with high expression of pVA plasmid and Pir toxins. In vitro assays showed that bile acids enhanced biofilm formation and increased the release of PirAB
vp toxins in AHPND-causing V. parahaemolyticus, while in vivo inhibition of LvASBT by GSK2330672 reduced the copy numbers of pVA plasmid, Pir toxin and reduced the amounts of bile acids in AHPND-infected shrimp stomach. Transcriptomics data for AHPND-causing V. parahaemolyticus treated with bile acids showed upregulation of various genes involved in membrane transport, RND efflux pumps and a bacterial secretion system. Taken together, our results show that AHPND-causing V. parahaemolyticus virulence is positively regulated by bile acids and that LvASBT and bile acids in shrimp stomach have important roles in AHPND pathogenesis., (© 2019 John Wiley & Sons Ltd.)- Published
- 2020
- Full Text
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6. A brief historical and evolutionary perspective on the origin of cellular microbiology research.
- Author
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Soldati T and Cardenal-Muñoz E
- Subjects
- Animals, Dictyostelium growth & development, Dictyostelium microbiology, Dictyostelium ultrastructure, History, 18th Century, History, 19th Century, History, 21st Century, Host-Pathogen Interactions, Humans, Immunity, Innate, Microbiology history, Mycobacterium marinum growth & development, Mycobacterium marinum pathogenicity, Phagosomes immunology, Phagosomes microbiology, Phagosomes ultrastructure, Dictyostelium immunology, Mycobacterium marinum immunology, Phagocytosis immunology
- Abstract
Integrated with both a historical perspective and an evolutionary angle, this opinion article presents a brief and personal view of the emergence of cellular microbiology research. From the very first observations of phagocytosis by Goeze in 1777 to the exhaustive analysis of the cellular defence mechanisms performed in modern laboratories, the studies by cell biologists and microbiologists have converged into an integrative research field distinct from, but fully coupled to immunity: cellular microbiology. In addition, this brief article is thought as a humble patchwork of the motivations that have guided the research in my group over a quarter century., (© 2019 John Wiley & Sons Ltd.)
- Published
- 2019
- Full Text
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7. GEOGRAPHY OF THE SIBLING SPECIES RELATED TO DROSOPHILA WILLISTONI , AND OF THE SEMISPECIES OF THE DROSOPHILA PAULISTORUM COMPLEX
- Author
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H. Hoenigsberg, R. C. Richmond, A. S. Hunter, Theodosius Dobzhansky, Francisco J. Ayala, Celso A. Mourão, B. Spassky, S. Perez-Salas, and O. Pavlovsky
- Subjects
0106 biological sciences ,0301 basic medicine ,biology ,media_common.quotation_subject ,Male genitalia ,biology.organism_classification ,010603 evolutionary biology ,01 natural sciences ,03 medical and health sciences ,Speciation ,030104 developmental biology ,Sibling species ,Evolutionary biology ,Genetics ,Drosophila paulistorum ,Gene Arrangements ,Drosophila willistoni ,General Agricultural and Biological Sciences ,Ecology, Evolution, Behavior and Systematics ,media_common - Abstract
The six sibling species of Drosophila willistoni group are among the most favorable, and at the same time challenging materials for studies on the genetics of speciation processes. The species are D. willistoni Sturtevant, D. paulistorum Dobzhansky & Pavan, D. pavlovskiana Kastritsis & Dobzhansky, D. equinoxialis Dobzhansky, D. tropicalis Burla & da Cunha, and D. insularis Dobzhansky. Burla et al. (1949) found slight morphological differences that were insufficient for identification of single individuals, but Spassky (1957) noted differences in the male genitalia which do permit such identification. Unambiguous discrimination is also possible through examination of the gene arrangements in the chromosomes of larval salivary glands (Burla et al., 1949; Dobzhansky et al., 1950), and of the variant enzymes detected by electrophoresis (Ayala et al., 1970). Owing to ethological isolation, crossmating of the species occurs rarely, although under laboratory conditions some cross-inseminations can be obtained (Burla et al., 1949). Intercrosses of D. insularis females with D. tropicalis and D. willistoni males, and occasionally with D. paulistorum
- Published
- 1971
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8. Genome Engineering for Crop Improvement
- Author
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Santosh Kumar Upadhyay and Santosh Kumar Upadhyay
- Subjects
- Crops--Genetic engineering, Plant biotechnology
- Abstract
In recent years, significant advancements have been made in the management of nutritional deficiency using genome engineering—enriching the nutritional properties of agricultural and horticultural crop plants such as wheat, rice, potatoes, grapes, and bananas. To meet the demands of the rapidly growing world population, researchers are developing a range of new genome engineering tools and strategies, from increasing the nutraceuticals in cereals and fruits, to decreasing the anti-nutrients in crop plants to improve the bioavailability of minerals and vitamins. Genome Engineering for Crop Improvement provides an up-to-date view of the use of genome editing for crop bio-fortification, improved bioavailability of minerals and nutrients, and enhanced hypo-allergenicity and hypo-immunogenicity. This volume examines a diversity of important topics including mineral and nutrient localization, metabolic engineering of carotenoids and flavonoids, genome engineering of zero calorie potatoes and allergen-free grains, engineering for stress resistance in crop plants, and more. Helping readers deepen their knowledge of the application of genome engineering in crop improvement, this book: Presents genetic engineering methods for developing edible oil crops, mineral translocation in grains, increased flavonoids in tomatoes, and cereals with enriched iron bioavailability Describes current genome engineering methods and the distribution of nutritional and mineral composition in important crop plants Offers perspectives on emerging technologies and the future of genome engineering in agriculture Genome Engineering for Crop Improvement is an essential resource for academics, scientists, researchers, agriculturalists, and students of plant molecular biology, system biology, plant biotechnology, and functional genomics.
- Published
- 2021
9. Handbook of Smart Materials in Analytical Chemistry
- Author
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Miguel de la Guardia, Francesc A. Esteve-Turrillas, Miguel de la Guardia, and Francesc A. Esteve-Turrillas
- Subjects
- Analytical chemistry, Smart materials
- Abstract
A comprehensive guide to smart materials and how they are used in sample preparation, analytical processes, and applications This comprehensive, two-volume handbook provides detailed information on the present state of new materials tailored for selective sample preparation and the legal frame and environmental side effects of the use of smart materials for sample preparation in analytical chemistry, as well as their use in the analytical processes and applications. It covers both methodological and applied analytical aspects, relating to the development and application of new materials for solid-phase extraction (SPE) and solid-phase microextraction (SPME), their use in the different steps and techniques of the analytical process, and their application in specific fields such as water, food, air, pharmaceuticals, clinical sciences and forensics. Every chapter in Handbook of Smart Materials in Analytical Chemistry is written by experts in the field to provide a comprehensive picture of the present state of this key area of analytical sciences and to summarize current applications and research literature in a critical way. Volume 1 covers New Materials for Sample Preparation and Analysis. Volume 2 handles Analytical Processes and Applications. Focuses on the development and applications of smart materials in analytical chemistry Covers both, methodological and applied analytical aspects, for the development of new materials and their use in the different steps and techniques of the analytical process and their application in specific fields Features applications in key areas including water, air, environment, pharma, food, forensic, and clinical Presents the available tools for the use of new materials suitable to aid recognition process to the sample preparation and analysis A key resource for analytical chemists, applied laboratories, and instrument companies Handbook of Smart Materials in Analytical Chemistry, 2V Set is an excellent reference book for specialists and advanced students in the areas of analytical chemistry, including both research and application environments.
- Published
- 2019
10. The Probabilistic Method
- Author
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Noga Alon, Joel H. Spencer, Noga Alon, and Joel H. Spencer
- Subjects
- Combinatorial analysis, Probabilities
- Abstract
Praise for the Third Edition “Researchers of any kind of extremal combinatorics or theoretical computer science will welcome the new edition of this book.” - MAA Reviews Maintaining a standard of excellence that establishes The Probabilistic Method as the leading reference on probabilistic methods in combinatorics, the Fourth Edition continues to feature a clear writing style, illustrative examples, and illuminating exercises. The new edition includes numerous updates to reflect the most recent developments and advances in discrete mathematics and the connections to other areas in mathematics, theoretical computer science, and statistical physics. Emphasizing the methodology and techniques that enable problem-solving, The Probabilistic Method, Fourth Edition begins with a description of tools applied to probabilistic arguments, including basic techniques that use expectation and variance as well as the more advanced applications of martingales and correlation inequalities. The authors explore where probabilistic techniques have been applied successfully and also examine topical coverage such as discrepancy and random graphs, circuit complexity, computational geometry, and derandomization of randomized algorithms. Written by two well-known authorities in the field, the Fourth Edition features: Additional exercises throughout with hints and solutions to select problems in an appendix to help readers obtain a deeper understanding of the best methods and techniques New coverage on topics such as the Local Lemma, Six Standard Deviations result in Discrepancy Theory, Property B, and graph limits Updated sections to reflect major developments on the newest topics, discussions of the hypergraph container method, and many new references and improved results The Probabilistic Method, Fourth Edition is an ideal textbook for upper-undergraduate and graduate-level students majoring in mathematics, computer science, operations research, and statistics. The Fourth Edition is also an excellent reference for researchers and combinatorists who use probabilistic methods, discrete mathematics, and number theory. Noga Alon, PhD, is Baumritter Professor of Mathematics and Computer Science at Tel Aviv University. He is a member of the Israel National Academy of Sciences and Academia Europaea. A coeditor of the journal Random Structures and Algorithms, Dr. Alon is the recipient of the Polya Prize, The Gödel Prize, The Israel Prize, and the EMET Prize. Joel H. Spencer, PhD, is Professor of Mathematics and Computer Science at the Courant Institute of New York University. He is the cofounder and coeditor of the journal Random Structures and Algorithms and is a Sloane Foundation Fellow. Dr. Spencer has written more than 200 published articles and is the coauthor of Ramsey Theory, Second Edition, also published by Wiley.
- Published
- 2016
11. Antimicrobial Polymers
- Author
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Jose Maria Lagaron, Maria Jose Ocio, Amparo Lopez-Rubio, Jose Maria Lagaron, Maria Jose Ocio, and Amparo Lopez-Rubio
- Subjects
- Plastics--Additives, Antimicrobial polymers, Materials--Microbiology
- Abstract
The pioneering guide on the design, processing, and testing of antimicrobial plastic materials and coatings The manifestation of harmful microbes in plastic materials used in medical devices and drugs, water purification systems, hospital equipment, textiles, and food packaging pose alarming health threats to consumers by exposing them to many serious infectious diseases. As a result, high demand for intensifying efforts in the R&D of antimicrobial polymers has placed heavy reliance on both academia and industry to find viable solutions for producing safer plastic materials. To assist researchers and students in this endeavor, Antimicrobial Polymers explores coupling contaminant-deterring biocides and plastics—focusing particular attention on natural biocides and the nanofabrication of biocides. Each chapter is devoted to addressing a key technology employed to impart antimicrobial behavior to polymers, including chemical modification of the polymers themselves. A host of relevant topics, such as regulatory matters, human safety, and environmental risks are covered to help lend depth to the book's vital subject matter. In addition, Antimicrobial Polymers: Discusses the design, processing, and testing of antimicrobial plastic materials Covers interdisciplinary areas of chemistry and microbiology Includes applications in food packaging, medical devices, nanotechnology, and coatings Details regulations from the U.S. (FDA and EPA) and EU as well as human safety and environmental concerns Achieving cleaner and more effective methods for improving the infection-fighting properties of versatile and necessary plastic materials is a goal that stretches across many scientific fields. Antimicrobial Polymers combines all of this information into one volume, exposing readers to preventive strategies that harbor vast potential for making exposure to polymeric products and surfaces a far less risky undertaking in the future.
- Published
- 2012
12. Medical Toxicology of Natural Substances : Foods, Fungi, Medicinal Herbs, Plants, and Venomous Animals
- Author
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Donald G. Barceloux and Donald G. Barceloux
- Subjects
- Poisonous animals, Poisonous plants, Natural products--Toxicology, Food poisoning
- Abstract
Interest and information in the field of medical toxicology has grown rapidly, but there has never been a concise, authoritative reference focused on the subjects of natural substances, chemical and physical toxins, drugs of abuse, and pharmaceutical overdoses. Medical Toxicology of Natural Substances finally gives you an easily accessible resource for vital toxicological information on foods, plants, and animals in key areas in the natural environment.
- Published
- 2008
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