BI280 Principles of Microbiology W-Lab
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Review Pili in Gram-Negative and Gram-Positive Bacteria – Structure
Cell. Mol. Life Sci. 66 (2009) 613 – 635 1420-682X/09/040613-23 Cellular and Molecular Life Sciences DOI 10.1007/s00018-008-8477-4 Birkhuser Verlag, Basel, 2008 Review Pili in Gram-negative and Gram-positive bacteria – structure, assembly and their role in disease T. Profta,c,* and E. N. Bakerb,c a School of Medical Sciences, Department of Molecular Medicine & Pathology, University of Auckland, Private Bag 92019, Auckland 1142 (New Zealand), Fax: +64-9-373-7492, e-mail: [email protected] b School of Biological Sciences, University of Auckland, Auckland (New Zealand) c Maurice Wilkins Centre for Molecular Biodiscovery, University of Auckland (New Zealand) Received 08 August 2008; received after revision 24 September 2008; accepted 01 October 2008 Online First 27 October 2008 Abstract. Many bacterial species possess long fila- special form of bacterial cell movement, known as mentous structures known as pili or fimbriae extend- twitching motility. In contrast, the more recently ing from their surfaces. Despite the diversity in pilus discovered pili in Gram-positive bacteria are formed structure and biogenesis, pili in Gram-negative bac- by covalent polymerization of pilin subunits in a teria are typically formed by non-covalent homopo- process that requires a dedicated sortase enzyme. lymerization of major pilus subunit proteins (pilins), Minor pilins are added to the fiber and play a major which generates the pilus shaft. Additional pilins may role in host cell colonization. be added to the fiber and often function as host cell This review gives an overview of the structure, adhesins. Some pili are also involved in biofilm assembly and function of the best-characterized pili formation, phage transduction, DNA uptake and a of both Gram-negative and Gram-positive bacteria. -
Establish Axenic Cultures of Armored and Unarmored Marine
www.nature.com/scientificreports OPEN Establish axenic cultures of armored and unarmored marine dinofagellate species using density separation, antibacterial treatments and stepwise dilution selection Thomas Chun‑Hung Lee1, Ping‑Lung Chan1, Nora Fung‑Yee Tam2, Steven Jing‑Liang Xu1 & Fred Wang‑Fat Lee1* Academic research on dinofagellate, the primary causative agent of harmful algal blooms (HABs), is often hindered by the coexistence with bacteria in laboratory cultures. The development of axenic dinofagellate cultures is challenging and no universally accepted method suit for diferent algal species. In this study, we demonstrated a promising approach combined density gradient centrifugation, antibiotic treatment, and serial dilution to generate axenic cultures of Karenia mikimotoi (KMHK). Density gradient centrifugation and antibiotic treatments reduced the bacterial population from 5.79 ± 0.22 log10 CFU/mL to 1.13 ± 0.07 log10 CFU/mL. The treated KMHK cells were rendered axenic through serial dilution, and algal cells in diferent dilutions with the absence of unculturable bacteria were isolated. Axenicity was verifed through bacterial (16S) and fungal internal transcribed spacer (ITS) sequencing and DAPI epifuorescence microscopy. Axenic KMHK culture regrew from 1000 to 9408 cells/mL in 7 days, comparable with a normal culture. The established methodology was validated with other dinofagellate, Alexandrium tamarense (AT6) and successfully obtained the axenic culture. The axenic status of both cultures was maintained more than 30 generations without antibiotics. This efcient, straightforward and inexpensive approach suits for both armored and unarmored dinofagellate species. Te frequency of harmful algal blooms (HABs) has been increasing worldwide over the past decades, which have major economic efects on fsh farming, the shellfsh industry, as well as human health 1,2. -
Obligate Aerobes Obligate Anaerobes and Facultative Anaerobes
Obligate Aerobes Obligate Anaerobes And Facultative Anaerobes Circumpolar and posterior Andonis never kyanised jauntily when Normand outdid his exasperation. Chanderjit pressurize her chondrite trisyllabically, soporiferous and nonary. Pathogenic and autogamic Thatcher always dehydrating swift and massacred his noteworthiness. In oxygen and not permitted by facultative aerobes use is then sealed BC led consult the initiation or sequence change in antibiotics, according to the microbiological data. Additionally, there are lean some constraints which radiate a broader application of their potentials. The method contains elements successfully applied to other methodologies. All content right this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. Denitrification are examples of facultative aerobes anaerobes and obligate aerobes: they employ to oxygen to plants and labor costs. Some dismiss these materials are more challenging than others, such as fish or paper mill plant, while others are easier to compost, like dawn or raw manure plus bedding. Below settings at lower levels while and obligate anaerobes present results is often forming spatial structure, which survive in the next level is calculated from food. These two oxygen can survive he can sound at atmospheric levels of oxygen. This atmosphere is known for growing facultative anaerobes and obligate anaerobes. Each of least four angles of a rectangle than a compound angle. Additionally, the anaerobic granular sludge is generally well stabilized and significantly less excess stomach is produced compared, for instance, after that ravage the aerobic systems. Obligate anaerobes lack both enzymes, leaving a little blood no protection against ROS. Furthermore, we mainly used antimicrobial agents that were effective against obligate anaerobes in the verb study; thus, chaos could not analyze the influence is the selection of antibiotic treatment according to the results of molecular analysis. -
Microbiology Unit- 1 1. According to Bergey's Manual of Systematic
Microbiology Unit- 1 1. According to Bergey’s Manual of Systematic Bacteriology, prokaryotes that lack a cell wall belong to the group? a) Gracilicutes b) Firmicutes c) Tenericutes d) Mendosicutes 2.Which among the following kingdoms were proposed by Whittaker? a) Monera b) Protista,Fungi c) Plantae,Animalia d) Monera,Protista,Fungi,Plantae,Animalia 3. Lipopolysaccharide in cell walls is characteristic of? a) Gram-positive bacteria b) Gram-negative bacteria c) Fungi d) Algae 4. Which of the following symmetry is exhibited by rod-shaped viruses? a) icosahedral b) helical c) complex d) circular 5. Fungi are ______________ a) prokaryotic b) eukaryotic c) prokaryotic and lack chlorophyll d) eukaryotic and lack chlorophyll 6. Which microorganism(s) among the following perform photosynthesis by utilizing light? a) Cyanobacteria b) Fungi c) Viruses d) Cyanobacteria, Fungi and Viruses 7. Adenoviruses exhibit which of the following symmetry? a) helical symmetry b) circular symmetry c) icosahedral symmetry d) complex structure symmetry 8. The transfer of genes from one cell to another by a bacteriophage is known as __________________ a) Recombination b) Conjugation c) Transduction d) Transformation 9. The cell in which the F factor carries along with it some chromosomal genes are known as ____________ a) F+ cell b) F— cell c) F’ cell d) F’’’ cell 10. The xanthophyte walls are typically of _____________________ a) chitin b) cellulose c) cellulose and pectin d) starch 11. Vaucheria is a single-celled organism. a) True b) False 12. In Chlamydomonas the most common method of sexual reproduction is ________________ a) isogamy b) heterogamy c) oogamy d) spore formation 13. -
Protozoa and Oxygen
Acta Protozool. (2014) 53: 3–12 http://www.eko.uj.edu.pl/ap ActA doi:10.4467/16890027AP.13.0020.1117 Protozoologica Special issue: Marine Heterotrophic Protists Guest editors: John R. Dolan and David J. S. Montagnes Review paper Protozoa and Oxygen Tom FENCHEL Marine Biological Laboratory, University of Copenhagen, Denmark Abstract. Aerobic protozoa can maintain fully aerobic metabolic rates even at very low O2-tensions; this is related to their small sizes. Many – or perhaps all – protozoa show particular preferences for a given range of O2-tensions. The reasons for this and the role for their distribution in nature are discussed and examples of protozoan biota in O2-gradients in aquatic systems are presented. Facultative anaerobes capable of both aerobic and anaerobic growth are probably common within several protozoan taxa. It is concluded that further progress in this area is contingent on physiological studies of phenotypes. Key words: Protozoa, chemosensory behavior, oxygen, oxygen toxicity, microaerobic protozoa, facultative anaerobes, microaerobic and anaerobic habitats. INTRODUCTION low molecular weight organics and in some cases H2 as metabolic end products. Some ciliates and foraminifera use nitrate as a terminal electron acceptor in a respira- Increasing evidence suggests that the last common tory process (for a review on anaerobic protozoa, see ancestor of extant eukaryotes was mitochondriate and Fenchel 2011). had an aerobic energy metabolism. While representa- The great majority of protozoan species, however, tives of different protist taxa have secondarily adapted depend on aerobic energy metabolism. Among pro- to an anaerobic life style, all known protists possess ei- tists with an aerobic metabolism many – or perhaps ther mitochondria capable of oxidative phosphorylation all – show preferences for particular levels of oxygen or – in anaerobic species – have modified mitochon- tension below atmospheric saturation. -
Culture Under Normoxic Conditions and Enhanced Virulence of Phase II Coxiella
bioRxiv preprint doi: https://doi.org/10.1101/747220; this version posted August 28, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 1 Culture under normoxic conditions and enhanced virulence of phase II Coxiella 2 burnetii transformed with a RSF1010-based shuttle vector 3 4 Shengdong Luo1,2#, Zemin He2#, Zhihui Sun2, Yonghui Yu2, Yongqiang Jiang2, Yigang 5 Tong1*, Lihua Song1* 6 7 1Beijing Advanced Innovation Center for Soft Matter Science and Engineering, 8 Beijing University of Chemical Technology, Beijing, 100029, China; 2State Key 9 Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and 10 Epidemiology, Beijing 100071, China 11 12 #These authors contributed equally. 13 *Corresponding author. Lihua Song ([email protected]); Yigang Tong 14 ([email protected]) 15 16 Keywords: Coxiella burnetii, microaerobic, normoxia, hypoxia, splenomegaly 17 18 Running title: Normoxic growth of Coxiella burnetii 19 bioRxiv preprint doi: https://doi.org/10.1101/747220; this version posted August 28, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 20 Abstract 21 Coxiella burnetii is a Gram-negative, facultative intracellular microorganism that can 22 cause acute or chronic Q fever in human. It was recognized as an obligate intracellular 23 organism until the revolutionary design of an axenic cystine culture medium (ACCM). -
Chapter 11: Bacteria Bacterial Groups
Bacterial Groups u Most widely accepted taxonomic classification for bacteria is Bergey’s Manual of Systematic Bacteriology. u 5000 bacterial species identified, 3100 classified. Chapter 11: Bacteria u Bacteria are divided into four divisions (phyla) according to the characteristics of their cell walls. u Each division is divided into sections according to: u Gram stain reaction u Cell shape u Cell arrangements u Oxygen requirements u Motility u Nutritional and metabolic properties u Each section contains several genera. Four Divisions of Bacteria Classification of Bacteria Procaryotes Gram-Negative Division II Wall-Less Archaea Bacteria Bacteria Bacteria Bacteria (Gracilicutes) (Firmicutes) (Tenericutes) (Mendosicutes) Thin Cell Walls Thick cell Walls Lack cell walls Unusual cell walls Division I. Gram-Negative Bacteria Gram Negative Bacteria Spirochetes 1. Spirochetes u Helical shape. Flexible. u Contain two or more axial filaments (endoflagella). u Move in corkscrew pattern. u Medically important members: F Treponema pallidum: Syphilis F Borrelia spp.: Lyme disease, relapsing fever F Leptospira: Leptospirosis 1 Syphilis is Caused by a Spirochete Lyme Disease is Caused by a Spirochete Primary syphilitic chancre and secondary rash. Source: Tropical Medicine and Parasitology, 1997 Lyme Disease early lesion at tick bite site. Source: Medical Microbiology, 1998 2. Aerobic, Motile, Helical/Vibroid Gram- Negative Bacteria Gram Negative Bacteria u Rigid helical shape or curved rods. Aerobic, Motile, Helical/Vibroid u Lack axial filaments (endoflagella); have polar Gram-Negative Bacteria flagella instead. u Most are harmless aquatic organisms. u Genus Azospirillum fixes nitrogen in soil. u Genus Bdellovibrio attacks other bacteria. u Important pathogens include: F Campylobacter jejuni: Most common bacterial food- borne intestinal disease in the United States (2 million cases/year). -
Engineering the Human Microbiome, a Natural Double-Barreled Approach Towards Solving Both Our Current Antibiotic Resistance and Sepsis Problems
American Journal of www.biomedgrid.com Biomedical Science & Research ISSN: 2642-1747 --------------------------------------------------------------------------------------------------------------------------------- Opinion Copy Right@ Toleman MA Engineering the Human Microbiome, A Natural Double-Barreled Approach Towards Solving both our Current Antibiotic Resistance and Sepsis Problems Martins W1, Mathias J1, Babenko D2 and Toleman MA1* 1Cardiff University Medical school, Department of Immunology and Infection, The Heath hospital, UK 2Karaganda Medical University, Kazakhstan *Corresponding author: Toleman MA, Cardiff University Medical school, Department of Immunology and Infection, The Heath hospital, Cardiff, UK. To Cite This Article: Martins W, Mathias J, Babenko D, Toleman MA, Engineering the Human Microbiome, A Natural Double-Barreled Approach Towards Solving both our Current Antibiotic Resistance and Sepsis Problems. Am J Biomed Sci & Res. 2020 - 11(3). AJBSR.MS.ID.001632. DOI: 10.34297/AJBSR.2020.11.001632. Received: December 12, 2020; Published: December 18, 2020 Opinion resistance mechanism responsible for this rise was an enzyme Many of the bacteria that cause life-threatening infection live called CTX-M-15 that gave resistance to the penicillin, monobactam, in very close association with us. Escherichia coli, for example and cephalosporin classes of the ß-lactam family of antibiotics (c. causes 80% of common community associated urinary tract infections and is also the main cause of serious (blood-stream) in several enteric pathogens including E. coli in New Delhi, India infection throughout Europe [1,2]. However, E. coli routinely lives 50% of all antibiotics) [7]. Its gene blaCTX-M-15 was first isolated in 2000 [8]. Later publications indicated that it was widespread as a commensal organism in our gut. -
Improved Protocol for the Preparation of Tetraselmis Suecica Axenic
36 The Open Biotechnology Journal, 2010, 4, 36-46 Open Access Improved Protocol for the Preparation of Tetraselmis suecica Axenic Culture and Adaptation to Heterotrophic Cultivation Mojtaba Azma1, Rosfarizan Mohamad1, Raha Abdul Rahim2 and Arbakariya B. Ariff*,1 1Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia 2Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia Abstract: The effectiveness of various physical and chemical methods for the removal of contaminants from the microal- gae, Tetraselmis suecica, culture was investigated. The information obtained was used as the basis for the development of improved protocol for the preparation of axenic culture to be adapted to heterotrophic cultivation. Repeated centrifugation and rinsing effectively removed the free bacterial contaminants from the microalgae culture while sonication helped to loosen up the tightly attached bacterial contaminants on the microalgae cells. Removal of bacterial spores was accom- plished using a mixture of two antibiotics, 5 mg/mL vancomycine and 10 mg/mL neomycine. Walne medium formulation with natural seawater was preferred for the enhancement of growth of T. suecica. Adaptation of growth from photoautot- rophic to heterotrophic conditions was achieved by the repeated cultivation of photoautotrophic culture with sequential reduction in illumination time, and finally the culture was inoculated into the medium containing 10 g/L glucose, incu- bated in total darkness to obtain heterotrophic cells. Changes in the morphology and composition of T. suecica cells dur- ing the adaptation from photoautotrophic to heterotrophic condition, as examined under Transmission Electron Micro- scope, were also reported. -
Title: WINOGRADSKY COLUMN AS a STRATEGY for MICROBIAL COMMUNITIES STUDY from MARINE and FRESHWATER ENVIRONMENTS
Title: WINOGRADSKY COLUMN AS A STRATEGY FOR MICROBIAL COMMUNITIES STUDY FROM MARINE AND FRESHWATER ENVIRONMENTS Authors: Copini, E.¹, de Almeida, B. N. C.¹, Canavese, C. M.¹, Cerávolo, M. S.¹, Antônio, E. S.¹, Almeida, F. P. R.¹, Camargo, M. D. C. ¹, dos Santos, G. A.¹, Machado, K. M. G.¹ Institution: ¹ Curso de Ciências Biológicas, Universidade Católica de Santos/ UniSantos (Av. Conselheiro Nébias 300, Santos, SP). Summary: Winogradsky column is widley used for microbial ecology studies and was employed to study microbial communities and assess the impact of the textile effluents in marine and freshwater environments. Soil and water samples were collected in Itaguaré, Bertioga, SP. The columns were prepared with the same nutrients (NPK, carbon and sulfur sources). Column Test received synthetic textile effluent (mixture of commercial dyes: yellow 0.1%, red 0.1% and blue 0.2%). Column without textile effluent was used as control. Incubation was carried out at room temperature, in the presence of indirect light. Visual observation was performed weekly for 2 months. Aerobic, microaerophile and anaerobic layers were processed: UFC count, isolation and characterization of axenic cultures (morphology, arrangement, response to Gram and O2 requirement, using enzymatic activities of catalase and cytochrome oxidase) and isolation of microrganisms that degrade dyes. They were used six different culture media (total bacteria, coliforms, anaerobic bacteria and red photosynthetic bacteria). Incubation at 28ºC and 37°C in the presence and absence of O2. The origin of the water and soil influence the formation of microbial communities. Prominent zonation was observed in freshwater columns, with extensive green and red zones, showing significant growth of phototrophics anaerobic bacteria. -
Current Issues of Nano-Bio-Science
Current Issues of Nano-Bio-Science CeNS Winterschool 2003 Mauterndorf, Austria 24-28 February 2003 Current Issues of Nano-Bio-Science CeNS Winterschool 2003 Mauterndorf, Austria 24-28 February 2003 in cooperation with SFB 486 and SFB 513 Program Committee Organisation Christoph Bräuchle Monika Kaempfe Jan von Delft Evelyn Morgenroth Hermann Gaub Joachim Rädler Jörg P. Kotthaus Paul Leiderer Joachim Rädler Internal Students’ Seminar: Schedule Saturday, 22nd February 7:30 pm Meeting in front of the castle’s lower gate to go the “Skialm” together 8:00 pm Get-together at the „Skialm“ in Mauterndorf (in the Skiing center) (kitchen closes at 9:30 pm) Sunday, 23rd February 9:45 am Introduction (W. Parak, F. Simmel) 10:00 am Simon Keller (AG Rädler) 10:30 am Stefan Griessl (AG Heckl) 11:00 am Coffee break 11:30 am Christine Meyer (AG Kotthaus) 12:00 pm Michael Sindel (AG von Delft) 12:30 pm Lunch (not provided), informal discussions 5:00 pm Ferdinand Kühner (AG Gaub) 5:30 pm Stefan Beyer (NG Simmel) Teresa Pellegrino (NG Parak) 6:00 pm Stefan Kowarik (AG Feldmann) 6:30 pm Break 7:00 pm Niklolay Petkov (AG Bein) 7:30 pm Sebastian Gritschneder (AG Reichling) 8:00 pm Ralf Bausinger / Johanna Kirstein (AG Bräuchle) 8:30 pm Conclusion Program Monday, 24th February 2003 8.30 – 8.45 Opening 8.45 – 9.45 Cees Dekker, Delft University of Technology Carbon nanotubes as model systems for nanoelectronics and nanosensors 9.45 – 10.45 Ulf Diederichsen, Universität Göttingen Molecular architecture with biooligomers 10.45 – 11.15 Coffee Break 11.15 – 12.15 Wolfgang -
Cell Structure and Function in the Bacteria and Archaea
4 Chapter Preview and Key Concepts 4.1 1.1 DiversityThe Beginnings among theof Microbiology Bacteria and Archaea 1.1. •The BacteriaThe are discovery classified of microorganismsinto several Cell Structure wasmajor dependent phyla. on observations made with 2. theThe microscope Archaea are currently classified into two 2. •major phyla.The emergence of experimental 4.2 Cellscience Shapes provided and Arrangements a means to test long held and Function beliefs and resolve controversies 3. Many bacterial cells have a rod, spherical, or 3. MicroInquiryspiral shape and1: Experimentation are organized into and a specific Scientificellular c arrangement. Inquiry in the Bacteria 4.31.2 AnMicroorganisms Overview to Bacterialand Disease and Transmission Archaeal 4.Cell • StructureEarly epidemiology studies suggested how diseases could be spread and 4. Bacterial and archaeal cells are organized at be controlled the cellular and molecular levels. 5. • Resistance to a disease can come and Archaea 4.4 External Cell Structures from exposure to and recovery from a mild 5.form Pili allowof (or cells a very to attach similar) to surfacesdisease or other cells. 1.3 The Classical Golden Age of Microbiology 6. Flagella provide motility. Our planet has always been in the “Age of Bacteria,” ever since the first 6. (1854-1914) 7. A glycocalyx protects against desiccation, fossils—bacteria of course—were entombed in rocks more than 3 billion 7. • The germ theory was based on the attaches cells to surfaces, and helps observations that different microorganisms years ago. On any possible, reasonable criterion, bacteria are—and always pathogens evade the immune system. have been—the dominant forms of life on Earth.