Download or read book Structure and Ultrastructure of Microorganisms written by E. M. Brieger and published by Academic Press. This book was released on 2013-10-22 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structure and Ultrastructure of Microorganisms: An Introduction to a Comparative Substructural Anatomy of Cellular Organization presents the structure or principle of operation of the electron microscope. This book provides an introduction to the submicroscopical anatomy of the cell in ultrathin sections of tissues or of single-cell organisms. Organized into 30 chapters, this book begins with an overview of the structures discovered by the use of an optical tool for observation. This text then examines the anatomical principle to the nucleus. Other chapters consider the structural organization of chromatin as revealed in electron micrographs of thin sections through cells in different stages of division. This book discusses as well the macronuclei of the ciliates, which plays a significant part in the reproductive mechanism. The final chapter deals with the micromolecular organization of bacterial flagella. This book is a valuable resource for scientists, biologist, physicists, protozoologists, cytologists, biochemists, biophysicists, and research workers.
Download or read book Ultrastructure Techniques for Microorganisms written by H.C. Aldrich and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: The modem microbiologist is often a real specialist who has difficulty under standing and applying many of the techniques beyond those in his or her own immediate field. On the other hand, most benefits to modem microbiology are obtained when a broad spectrum of scientific approaches can be focused on a problem. In early studies, electron microscopy was pivotal in understanding bacterial and viral morphology, and we still feel that we will understand a disease better if we have seen an electron micrograph of the causative agent. Today, because there is an increased awareness of the need to understand the rela tionships between microbial structure and function, the electron microscope is still one of the most important tools microbiologists can use for detailed analysis of microorganisms. Often, however, the aforementioned modem microbiologist still thinks of ultrastructure as involving negative staining or ultrathin sectioning in order to get a look at the shape of a "bug. " Many of the newer ultrastructure techniques, such as gold-labeled antibody localization, freeze-fracture, X-ray microanalysis, enzyme localization, and even scanning electron microscopy, are poorly under stood by, and therefore forbidding to, the average microbiologist. Even many cell biologists admit to having difficulty staying in touch with current develop ments in the fast-moving field of electron microscopy techniques.
Download or read book Ultrastructure of Bacterial Viruses written by Anna S. Tikhonenko and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mter the discoveryof the tobacco mosaic virus by D. I. Ivanov skU in 1892 [14], the new science of virology was born and began to develop rapidly. The number of viruses now known is enormous and they can infect nearly all animal and plant organisms. Microorganisms themselves are no exception to this rule. Despite intensive study of Vlruses, their origin and nature are still a subject for speculation and hypothesis. The general concept of viruses embraces a wide group of biologically active structures occupying an intermediate position between living and nonliving matter. The dual character of viruses is determined by the fact that, while they do not possess an inde pendent system of metabolism, which is a characteristic feature of every living being, they nevertheless carry within themselves all the necessary information for autoreproduction. A striking feature of the virus is that it consists essentially of two components: a protein envelope and the nucleic acid con tained within it. In contrast to the elementary structural unit of the living or ganism, the cell, which contains two types of nucleic acid (DNA and RNA), the virus particle contains only one type of nucleic acid - either DNA or RNA. It is perhaps this which is responsible for the imperfection of the virus as a living organism.
Download or read book Bacterial Cell Wall written by J.-M. Ghuysen and published by Elsevier. This book was released on 1994-02-09 with total page 607 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies of the bacterial cell wall emerged as a new field of research in the early 1950s, and has flourished in a multitude of directions. This excellent book provides an integrated collection of contributions forming a fundamental reference for researchers and of general use to teachers, advanced students in the life sciences, and all scientists in bacterial cell wall research. Chapters include topics such as: Peptidoglycan, an essential constituent of bacterial endospores; Teichoic and teichuronic acids, lipoteichoic acids, lipoglycans, neural complex polysaccharides and several specialized proteins are frequently unique wall-associated components of Gram-positive bacteria; Bacterial cells evolving signal transduction pathways; Underlying mechanisms of bacterial resistance to antibiotics.
Download or read book Microbial Ultrastructure written by Society for Applied Bacteriology and published by . This book was released on 1976 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structure and Ultrastructure of Microorganisms written by Ernest Max Brieger and published by . This book was released on 1963 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bacterial Cell Structure written by Howard John Rogers and published by . This book was released on 1983 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microbial Cell Walls and Membranes written by H. R. Perkins and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 555 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1968 when Cell Walls and Membranes was published it was still reasonable to attempt to write a book covering the whole subject. Accordingly this edition of the book had something to say about walls from micro-organisms and plants as well as about membranes from bacteria and animal cells. A decade later this is manifestly impossible. Knowledge about almost all the subjects has grown explosively, par ticularly about membranes and the biosynthesis of macromolecules. Moreover aspects of the subject that were still in a relatively primitive state ten years ago have grown into highly sophisticated subjects worthy of extended treatment. The result is that the present book has had to be confined to structures and functions relating to only one division of the biological kingdom, namely micro-organisms. Even then severe limitations have had to be made to keep the task within the time available to the authors and their expertise. A few of the titles of chapters such as those on the isolation of walls and membranes, the structure of the components of bacterial and micro-fungal walls and their biosynthesis remain from the earlier book. These chapters have been almost completely rewritten and a number of quite new chapters added on topics such as the action of the antibiotics that inhibit bacterial wall syn thesis, on the function of bacterial membranes, and the bacterial autolysins.
Download or read book Bacterial Pathogenesis written by and published by Academic Press. This book was released on 1998-07-01 with total page 643 pages. Available in PDF, EPUB and Kindle. Book excerpt: Established almost 30 years ago, Methods in Microbiology is the most prestigious series devoted to techniques and methodology in the field. Now totally revamped, revitalized, with a new format and expanded scope, Methods in Microbiology will continue to provide you with tried and tested, cutting-edge protocols to directly benefit your research. Focuses on the methods most useful for the microbiologist interested in the way in which bacteria cause disease Includes section devoted to 'Approaches to characterising pathogenic mechanisms' by Stanley Falkow Covers safety aspects, detection, identification and speciation Includes techniques for the study of host interactions and reactions in animals and plants Describes biochemical and molecular genetic approaches Essential methods for gene expression and analysis Covers strategies and problems for disease control
Download or read book The Ultrastructure of Pathogenic Bacteria under Different Ecological Conditions written by Larisa Mikhailovna Somova and published by Cambridge Scholars Publishing. This book was released on 2020-02-09 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today, the problem of bacteria variability occupies one of the key positions in microbiology. Particular attention is paid to the need to expand research to determine the variability of bacteria under natural habitats. There is still no solid information about the morphological variability of bacteria and its essence. This book is the first to summarise information about the ultrastructure of pathogenic bacteria under different conditions of existence. The results of extensive studies conducted in model microecosystems under various trophic and temperature conditions of cultivation presented here serve to fill this research gap. The book also describes the complex of similar morphological changes that provide the functional usefulness of different species of bacteria in detail, allowing the expression of the assumption that the adaptation mechanisms of heterogeneous populations of microorganisms to changing environmental conditions are universal.
Download or read book Electron Microscopy in Microbiology written by and published by Academic Press. This book was released on 1988-10-01 with total page 443 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume of this acclaimed series deals with electron microscopic techniques applied for the elucidation of microbial structures and structure-function relationships at cellular, sub-cellular, and macromolecular levels. Many of the recent findings on ultrastructural features of microorganisms have been obtained with newly developed methods, though classical approaches have not lost their validity. Therefore, both conventional and new methods have been incorporated into this volume. The topics dealt with are meaningful not only in bacterial cytology but also in physiology, enzymology, biochemistry, and molecular biology, and include aspects of medical and biotechnological application.
Download or read book Characterization of Bacterial Ultrastructure Involved in Storage Granule Formation and DNA Segregation written by Doaa Fakih and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Project I: Endospores represent a dormant state of bacteria that allows them to withstand extreme conditions and persist for years. Endospore formation has shaped evolution, whereby it exclusively occurs in Firmicutes. Several studies have reported endospore formation in species outside of Firmicutes, particularly in two species of Proteobacteria, Rhodobacter johrii and Serratia marcescens, and one species of Actinobacteria, Mycobacterium marinum. Identifying endospores outside of Firmicutes would affect the shape of the tree of life and aid in our fight against human pathogens. Therefore, we aimed to investigate endosporulation in these three species using advanced imaging and analytical approaches, including correlative light and electron microscopy (CLEM), cryo-electron tomography (cryo-ET), and lipidomics. We used the well-characterized sporulating bacterium Bacillus subtilis as a positive control of sporulation. Examination of R. johrii, S. marcescens, and M. marinum using CLEM and cryo-ET showed that phase-bright objects did not resemble any stages of endosporulation. Cryo-tomograms revealed that the phase-bright objects in S. marcescens were aggregated cellular debris of dead cells, whereas they displayed granular structures typical of bacterial cells in R. johrii and M. marinum. Lipidomic analysis in R. johrii identified the granular structures as potential storage granules enriched with triacyl-glycerides (TAGs). We speculate that TAGs may provide an energy source to withstand the nutrient depletion. Additional biochemical and bioinformatics approaches supported our conclusions that R. johrii, S. marcescens, and M. marinum are non-sporulating bacteria. Project II: Plasmids play a vital role in the spread of resistance genes within and across bacterial species. Therefore, it is essential to understand the bacterial systems involved in the transfer and maintenance of plasmids to better aid in our fight against the spread of antibiotic resistance. In this doctorate, we aimed to characterize the alp7ARC operon, employing the bacterial actin homolog Alp7A to segregate the tetracycline resistance-encoding plasmid pLS20 in B. subtilis. The stability of the plasmid was shown to be dependent on the alp7ARC operon, indicating an essential role in plasmid segregation. Preliminary results on Alp7A showed that it assembles into a novel tubular nanostructure rather than filaments, suggesting a novel mechanism for DNA segregation by Alp7A. We further studied the structure of Alp7A in vivo using combination of approaches, including molecular biology, cryo-ET, and fLM. We also used CLEM to localize Alp7A in whole cells to a macromolecular resolution. Besides, we investigated the structure and function of Alp7A in vitro by transfecting E. coli with various plasmid constructs and purification by several methods, including affinity chromatography and ammonium sulfate precipitation. I discussed the diverse challenges we encountered in these experiments, such as bacterial thickness, contamination, and Alp7A protein instability. Finally, I proposed alternative experimental approaches for investigating the mechanism of plasmid segregation by Alp7ARC.
Download or read book Ultrastructural Plasticity of Cyanobacteria written by Olga I. Baulina and published by Springer Science & Business Media. This book was released on 2012-10-28 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers an in-depth analysis of the cell biology of cyanobacteria, a group of phototrophic microorganisms performing an important function in the biosphere. The chapters present the author’s and her colleagues’ pioneering investigations of the ultrastructure of cyanobacteria under high-light and dark conditions, during irradiation by extremely high fluxes of light, in the course of L-transformation and within model associations and natural symbioses with plants. Diverse patterns of ultrastructural change are illustrated in electron micrographs and schematics. The book further introduces a new concept of “bacterial ultrastructural plasticity” - the reversible rearrangement of ultrastructure in response to environmental changes, as a strategy for finding and investigating cell adaptation mechanisms and intraspecies structural diversity of cyanobacteria and other prokaryotes. It serves as a valuable guide for teaching and research in the field of cell biology of microorganisms and plant-cyanobacteria symbioses.
Download or read book Microbial Surfaces written by Terri A. Camesano and published by Amer Chemical Society. This book was released on 2008 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interactions of microbes with surfaces are important to many natural and engineered processes, affecting a wide range of applications from decontamination of surfaces or drinking water, prevention of microbial colonization of biomaterials, and bacterial processes in the environment. Therefore, there is great interest in understanding the fundamental behavior of microbes at surfaces. Topics are included that address interactions of cells with a number of surfaces for antifouling and microbial cell-based sensor applications; mechanistic studies of antimicrobial peptides and quorum sensing; exploration of experimental and theoretical models of a cell surface; cell surface display of peptides and enzymes as biofabrication techniques; the fate and transport of bacteria in the natural environment, as well as new experimental tools or modeling techniques to study interactions at the microbial surface. While most of the papers are geared towards a specific application, they all contain fundamental information regarding bacterial behavior at interfaces that allows their contents to translate to other problems, as well. For example, many parallels are noted between the way bacteria interact with proteins-coated polymers on a catheter and bacterial-peptide interactions in a cellular detection assay. An overlying theme of all the manuscripts is that they represent studies of microbial interfaces using the most sophisticated experimental and modeling tools available, and many feature interdisciplinary approaches to tackling the given problems.
Download or read book Microbial Cell Walls and Membranes written by Howard John Rogers and published by Springer. This book was released on 1980-12-18 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrastructure of bacterial envelopes; Isolation of walls and Membranes; Membrane structure and composition in micro-organisms; Membrane functions; Membranes of bacteria lacking peptidoglycan; Structure of peptidoglycan; Additional polymers in bacterial walls; Biosynthesis of peptidoglycan; Antibiotics affecting bacterial wall synthesis; Biosynthesis of other bacterial wall components; The bacterial autolysins; Cell walls of mycobacteria; Cell walls of filamentous fungi; Biosynthesis of wall components in yeast and filamentous fungi; The cell wall in the growth and cell division of bacteria.
Download or read book The Ultrastructure of Bacteria USSR written by and published by . This book was released on 1960 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book General Microbiology written by Linda Bruslind and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Welcome to the wonderful world of microbiology! Yay! So. What is microbiology? If we break the word down it translates to "the study of small life," where the small life refers to microorganisms or microbes. But who are the microbes? And how small are they? Generally microbes can be divided in to two categories: the cellular microbes (or organisms) and the acellular microbes (or agents). In the cellular camp we have the bacteria, the archaea, the fungi, and the protists (a bit of a grab bag composed of algae, protozoa, slime molds, and water molds). Cellular microbes can be either unicellular, where one cell is the entire organism, or multicellular, where hundreds, thousands or even billions of cells can make up the entire organism. In the acellular camp we have the viruses and other infectious agents, such as prions and viroids. In this textbook the focus will be on the bacteria and archaea (traditionally known as the "prokaryotes,") and the viruses and other acellular agents.
