Dyuthi T-2323.Pdf

Total Page:16

File Type:pdf, Size:1020Kb

Dyuthi T-2323.Pdf PREVALENCE, RISK ASSESSMENT AND SURVIVAL KINETICS OF INDICATOR AND PATHOGENIC BACTERIA IN WATER, SEDIMENT AND BIVALVE SHELLFISH FROM COCHIN ESTUARY Thesis submitted to Cochin University of Science and Technology in Partial Fulfilment of the Requirements for the Award of the Degree of Doctor of Philosophy in Microbiology Under the Faculty of Marine Sciences By ALLY C. ANTONY Reg. No: 3947 DEPARTMENT OF MARINE BIOLOGY, MICROBIOLOGY AND BIOCHEMISTRY SCHOOL OF MARINE SCIENCES COCHIN UNIVERSITY OF SCIENCE AND TECHNOLOGY KOCHI –682 016, INDIA May 2017 Prevalence, Risk Assessment and Survival Kinetics of Indicator and Pathogenic Bacteria in Water, Sediment and Bivalve Shellfish from Cochin Estuary Ph.D. Thesis under the Faculty of Marine Sciences Author Ally C. Antony Research Scholar Department of Marine Biology, Microbiology and Biochemistry School of Marine Sciences Cochin University of Science and Technology Kochi – 682 016 Supervising Guide Dr. A. A. Mohamed Hatha Professor Department of Marine Biology, Microbiology and Biochemistry School of Marine Sciences Cochin University of Science and Technology Kochi – 682 016 Department of Marine Biology, Microbiology and Biochemistry School of Marine Sciences Cochin University of Science and Technology Kochi – 682 016 May 2017 Department of Marine Biology, Microbiology and Biochemistry School of Marine Sciences Cochin University of Science and Technology Kochi – 682 016 Dr. A. A Mohamed Hatha Professor This is to certify that the thesis entitled “Prevalence, Risk Assessment and Survival Kinetics of Indicator and Pathogenic Bacteria in Water, Sediment and Bivalve Shellfish from Cochin Estuary” is an authentic record of research work carried out by Ms. Ally C. Antony under my supervision and guidance in the Department of the Marine Biology, Microbiology and Biochemistry, School of Marine Sciences, Cochin University of Science and Technology, in partial fulfilment of the requirements for the award of the degree of Doctor of Philosophy in Microbiology of Cochin University of Science and Technology, and no part thereof has been presented for the award of any other degree, diploma or associateship in any other University or Institution. All the relevant corrections and modifications suggested by the audience during the pre-submission seminar and recommended by the Doctoral Committee have been incorporated in the thesis. Kochi - 682 016 Prof. (Dr.) A. A. Mohamed Hatha May 2017 (Supervising Guide) I hereby declare that the thesis entitled “Prevalence, Risk Assessment and Survival Kinetics of Indicator and Pathogenic Bacteria in Water, Sediment and Bivalve Shellfish from Cochin Estuary” is a genuine record of research work done by me under the supervision and guidance of Dr. A. A. Mohamed Hatha, Professor, Department of Marine Biology, Microbiology and Biochemistry, Cochin University of Science and Technology and no part thereof has been presented for the award of any other degree, diploma or associateship in any other University or Institution earlier. Kochi - 682 016 Ally C. Antony May 2017 It gives me immense pleasure to gratefully acknowledge all those who have helped me in making of this thesis possible. First and foremost let me acknowledge my Lord Jesus Christ for the tremendous support and blessing showered upon me throughout this journey. “I can do all things through him who strengthens me”. Throughout my venture I enjoyed the powerful guidance of the holy spirit without whom this thesis would not have been accomplished. I would like to express my sincere gratitude to my supervising guide Dr. A. A. Mohamed Hatha, Professor, Department of Marine Biology, Microbiology and Biochemistry, for his immense support, guidance and encouragement throughout the course of my Ph.D. programme. His valuable advice, vision and the kind of passion he himself kept for research, has inspired me to undertake my research work more seriously. The freedom and flexibility that I was granted during my work needs special mention, as it has helped a lot to improve my individual research skills, making me more independent and confident. I would like to thank him for being so kind to me in correcting the thesis in very short span of time, in spite of his busy schedule. The valuable suggestions rendered have contributed significantly in improving the thesis. I gratefully acknowledge all the past and present HODs of the Department of Marine Biology, Microbiology and Biochemistry and the present and past Directors of the School of Marine Sciences for allowing me to use the facilities of the institution. I am deeply grateful to the faculty members Dr. Rosamma Philip, Dr. A. V. Saramma, Dr. Bijoy Nandan, Dr. Aneykutty Joseph, and Dr. Babu Philip for their expert advice and valuable suggestions which helped me to improve my work. I am highly indebted to Dr. A. V. Saramma, for kindly introducing and recommending me as research student to my supervisor Dr. A. A. Mohamed Hatha, which has enabled me to get enrolled in this prestigious institution. I sincerely acknowledge the University Grants Commission for providing me FIP teacher fellowship to pursue Ph.D programme. I also place on record my sincere gratitude to the Management and the Principal, M.E.S College, Marampally for permitting me to avail the teacher fellowship giving all the support which enabled me to undertake this Ph.D programme. I would like to thank the administrative office staff of the Department of Marine Biology, Microbiology and Biochemistry, the Librarian and other staff of the School of Marine Sciences Library for the support rendered to me during the research. I gratefully acknowledge Dr. M. Mini, Professor, College of Veterinary and Animal Sciences, Mannuthy for sharing her knowledge which was helpful for me in the initial phase in designing my research work. I’m thankful for my lab mates for their co-operation and accepting me as one among them, which made the journey much comfortable and happier. It will be ungrateful from my part if I do not acknowledge their contributions. My special thanks are due to Reshma Silvester, for sparing her valuable time in teaching me the basics of molecular biology and for proof reading of my manuscripts and thesis. I place on record my sincere thanks to Dr. Vipindas for kindly sharing his valuable knowledge and helping me in meeting some of my objectives. I am highly indebted to Ajith Joseph, for his sincere help in formatting my reference in a very perfect manner. I would like to express my sincere gratitude to Ms. Debora for her valuable suggestions, sharing her knowledge as well as proof reading my whole thesis carefully in very short span of time. My sincere thanks are due to Dr. Mujeeb Rahiman, who very kindly shared his knowledge, taught us many things and offered all help wherever possible. I express my gratitude to Divya P. S. for helping me a lot, especially in the initial part of my work. My special thanks are due to my companion Aneesa. Our train journeys were platforms for active discussions, sharing and with nostalgia I cherish those memories. My special thanks are due to my friends Soumya Krishnankutty, Bini Francis, Jesmi Yousuf, Jabir T, Ajin Madhav, Nifty, Neethu, Soumya M, ThasneemT.R, Nashad, Vishnu P.S, Satheesh T.B, Suresh, Gigi, Vincent, Dr. Jaseetha, Jemi and Vishnupriya for their kind cooperation and help offered whenever required. I fondly acknowledge Sajna and my friends from other labs Manomi, Bhavya, Sruthy, Rosmine, Solly, Neema Job, and Abhijith for the timely help rendered. I express my sincere gratitude to the HOD, Dr. Manzurali P.P and all other faculty members of the Department of Biosciences, M.E.S College, Marampally for their tremendous support. I express my heartfelt thanks to Dr. Mini K. Paul for her moral support and encouragement and Dr. Umesh B. T. for helping me to get all the office correspondence done on time, throughout my FIP period. I also thank Mr. Vivas Salim for his wonderful expertise in photo editing which was very much useful in my thesis preparation. I am happy to acknowledge Ms. Annu Mariya for handling my classes during the period of my absence in the college. I gratefully acknowledge Rev. Fr. Kuriakose Cheruvallil for strengthening me spiritually through his kind visits, sincere prayers and blessings. With deep sense of gratitude I acknowledge the prayers of Rev. Fr. George Koilparambil, Rev. Fr Robin Kuzhinjalil and Rev. Fr. Stenny Kunnekkadan. I also thank Sr. Flowry, Sr. Nitha and Sr. Joycy for their constant prayers and blessings throughout my venture. I bow before the memories of my beloved parents, late Mr. C.J. Antony and late Mrs. Flower Antony and deeply acknowledge their love, sacrifice, blessings and prayers which helped in bringing me this far. I also fondly remember and acknowledge the advice and support rendered by my beloved father in law, late Mr. K.O.George. I thank my sisters Mrs. Latha Jose, Mrs. Jancy Biju, Mrs. Joycy Seby and brothers in law Mr. Biju Jose and Mr. Seby Manavalan for their sincere love, care and prayers. I gratefully acknowledge Mr. Jose K.F, who has whole heartedly supported and motivated me as my guardian throughout my academic life, without which I could not have gone this far. I fondly remember my brother Mr. John C.A and sister in law Mrs. Simmy John for their love and prayers. I also acknowledge the moral support and encouragement received from my husbands’ brothers Mr. Joshy George and Dr. Varghese Jaison, co-sisters Mrs. Asha Joshi, Mrs. Liza Joy and Dr. Laly Jaison. I gratefully acknowledge Dr. Joy George for the goodwill, advice and affection shown towards me and for procuring me some of the essential requirements necessary to carry out my research work. Last but not the least let me acknowledge my family who has stood as a pillar of support as I pursued my passion for research.
Recommended publications
  • Molecular Investigation of Isolates from a Multistate Polymicrobial
    Pillonetto et al. BMC Infectious Diseases (2018) 18:397 https://doi.org/10.1186/s12879-018-3287-2 RESEARCHARTICLE Open Access Molecular investigation of isolates from a multistate polymicrobial outbreak associated with contaminated total parenteral nutrition in Brazil Marcelo Pillonetto1,2*, Lavinia Arend2, Suzie M. T. Gomes3, Marluce A. A. Oliveira4, Loeci N. Timm5, Andreza F. Martins6, Afonso L. Barth6, Alana Mazzetti1, Lena Hersemann7,8, Theo H. M. Smits7 , Marcelo T. Mira1† and Fabio Rezzonico7† Abstract Background: Between November 2013 and June 2014, 56 cases of bacteremia (15 deaths) associated with the use of Total Parenteral Nutrition (TPN) and/or calcium gluconate (CG) were reported in four Brazilian states. Methods: We analyzed 73 bacterial isolates from four states: 45 from blood, 25 from TPN and three from CG, originally identified as Acinetobacter baumannii, Rhizobium radiobacter, Pantoea sp. or Enterobacteriaceae using molecular methods. Results: The first two bacterial species were confirmed while the third group of species could not be identified using standard identification protocols. These isolates were subsequently identified by Multi-Locus Sequence Analysis as Phytobacter diazotrophicus, a species related to strains from similar outbreaks in the United States in the 1970’s. Within each species, TPN and blood isolates proved to be clonal, whereas the R. radiobacter isolates retrieved from CG were found to be unrelated. Conclusion: This is the first report of a three-species outbreak caused by TPN contaminated with A. baumannii, R. radiobacter and P. diazotrophicus. The concomitant presence of clonal A. baumannii and P. diazotrophicus isolates in several TPN and blood samples, as well as the case of one patient, where all three different species were isolated simultaneously, suggest that the outbreak may be ascribed to a discrete contamination of TPN.
    [Show full text]
  • Changes in Acetylene Reduction Activities and Nifh Genes Associated with Field-Grown Sweet Potatoes with Different Nursery Farmers and Cultivars
    horticulturae Article Changes in Acetylene Reduction Activities and nifH Genes Associated with Field-Grown Sweet Potatoes with Different Nursery Farmers and Cultivars Kazuhito Itoh * , Keisuke Ohashi, Nao Yakai, Fumihiko Adachi and Shohei Hayashi Faculty of Life and Environmental Sciences, Shimane University, 1060 Nishikawatsu, Matsue, Shimane 690-8504, Japan * Correspondence: [email protected]; Tel.: +81-852-32-6521 Received: 17 May 2019; Accepted: 25 July 2019; Published: 27 July 2019 Abstract: Sweet potato cultivars obtained from different nursery farmers were cultivated in an experimental field from seedling-stage to harvest, and the acetylene reduction activity (ARA) of different parts of the plant as well as the nifH genes associated with the sweet potatoes were examined. The relationship between these parameters and the plant weights, nitrogen contents, and natural abundance of 15N was also considered. The highest ARA was detected in the tubers and in September. Fragments of a single type of nitrogenase reductase gene (nifH) were amplified, and most of them had similarities with those of Enterobacteriaceae in γ-Proteobacteria. In sweet potatoes from one nursery farm, Dickeya nifH was predominantly detected in all of the cultivars throughout cultivation. In sweet potatoes from another farm, on the other hand, a transition to Klebsiella and Phytobacter nifH was observed after the seedling stage. The N2-fixing ability contributed to plant growth, and competition occurred between autochthonous and allochthonous bacterial communities in sweet potatoes. Keywords: sweet potato; endophyte; nitrogen fixation; nifH gene 1. Introduction The sweet potato (Ipomoea batatas L.) is a dicotyledonous plant that belongs to the family Convolvulaceae and is a subsistence crop with huge economic importance, especially in developing countries.
    [Show full text]
  • System in the Order Enterobacterales Pieter De Maayer1* , Talia Pillay1 and Teresa A
    Maayer et al. BMC Genomics (2020) 21:100 https://doi.org/10.1186/s12864-020-6529-9 RESEARCH ARTICLE Open Access Comparative genomic analysis of the secondary flagellar (flag-2) system in the order Enterobacterales Pieter De Maayer1* , Talia Pillay1 and Teresa A. Coutinho2 Abstract Background: The order Enterobacterales encompasses a broad range of metabolically and ecologically versatile bacterial taxa, most of which are motile by means of peritrichous flagella. Flagellar biosynthesis has been linked to a primary flagella locus, flag-1, encompassing ~ 50 genes. A discrete locus, flag-2, encoding a distinct flagellar system, has been observed in a limited number of enterobacterial taxa, but its function remains largely uncharacterized. Results: Comparative genomic analyses showed that orthologous flag-2 loci are present in 592/4028 taxa belonging to 5/8 and 31/76 families and genera, respectively, in the order Enterobacterales. Furthermore, the presence of only the outermost flag-2 genes in many taxa suggests that this locus was far more prevalent and has subsequently been lost through gene deletion events. The flag-2 loci range in size from ~ 3.4 to 81.1 kilobases and code for between five and 102 distinct proteins. The discrepancy in size and protein number can be attributed to the presence of cargo gene islands within the loci. Evolutionary analyses revealed a complex evolutionary history for the flag-2 loci, representing ancestral elements in some taxa, while showing evidence of recent horizontal acquisition in other enterobacteria. Conclusions: The flag-2 flagellar system is a fairly common, but highly variable feature among members of the Enterobacterales.
    [Show full text]
  • A Report of 37 Unrecorded Anaerobic Bacterial Species Isolated from the Geum River in South Korea
    Journal of Species Research 9(2):105-116, 2020 A report of 37 unrecorded anaerobic bacterial species isolated from the Geum River in South Korea Changsu Lee, Joon Yong Kim, Yeon Bee Kim, Juseok Kim, Seung Woo Ahn, Hye Seon Song and Seong Woon Roh* Microbiology and Functionality Research Group, World Institute of Kimchi, Gwangju 61755, Republic of Korea *Correspondent: [email protected] A total of 37 anaerobic bacteria strains within the classes Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, Bacteroidia, Flavobacteriia, Bacilli, Clostridia, and Fusobacteriia were isolated from freshwater and sediment of the Geum River in Korea. The unreported species were related with Rhizobium and Oleomonas of the class Alphaproteobacteria; Acidovorax, Pseudogulbenkiania, and Aromatoleum of the class Betaproteobacteria; Tolumonas, Aeromonas, Cronobacter, Lonsdalea, and Phytobacter of the class Gammaproteobacteria; Bacteroides, Dysgonomonas, Macellibacteroides, and Parabacteroides of the class Bacteroidia; Flavobacterium of the class Flavobacteriia; Bacillus and Paenibacillus of the class Bacilli; Clostridium, Clostridioides, Paraclostridium, Romboutsia, Sporacetigenium, and Terrisporobacter of the class Clostridia; and Cetobacterium and Ilyobacter of the class Fusobacteriia. A total of 37 strains, with >98.7% 16S rRNA gene sequence similarity with validly published bacterial species, but not reported in Korea, were determined to be unrecorded anaerobic bacterial species in Korea. Keywords: ‌16S rRNA, anaerobic bacteria, bacterial diversity, taxonomy, unrecorded species Ⓒ 2020 National Institute of Biological Resources DOI:10.12651/JSR.2020.9.2.105 INTRODUCTION lated culture in Korea. In the present study, we attempted to isolate anaerobic Since the Nagoya Protocol and the Convention on Bi- microorganisms from freshwater and sediment in the ological Diversity, securing and managing of biological Geum River of Korea.
    [Show full text]
  • Comparative Genomic Analysis of the Supernumerary Flagellar Systems Among the Enterobacterales Pieter De Maayer1* , Talia Pillay1 and Teresa A
    De Maayer et al. BMC Genomics (2020) 21:670 https://doi.org/10.1186/s12864-020-07085-w RESEARCH ARTICLE Open Access Flagella by numbers: comparative genomic analysis of the supernumerary flagellar systems among the Enterobacterales Pieter De Maayer1* , Talia Pillay1 and Teresa A. Coutinho2 Abstract Background: Flagellar motility is an efficient means of movement that allows bacteria to successfully colonize and compete with other microorganisms within their respective environments. The production and functioning of flagella is highly energy intensive and therefore flagellar motility is a tightly regulated process. Despite this, some bacteria have been observed to possess multiple flagellar systems which allow distinct forms of motility. Results: Comparative genomic analyses showed that, in addition to the previously identified primary peritrichous (flag-1) and secondary, lateral (flag-2) flagellar loci, three novel types of flagellar loci, varying in both gene content and gene order, are encoded on the genomes of members of the order Enterobacterales. The flag-3 and flag-4 loci encode predicted peritrichous flagellar systems while the flag-5 locus encodes a polar flagellum. In total, 798/4028 (~ 20%) of the studied taxa incorporate dual flagellar systems, while nineteen taxa incorporate three distinct flagellar loci. Phylogenetic analyses indicate the complex evolutionary histories of the flagellar systems among the Enterobacterales. Conclusions: Supernumerary flagellar loci are relatively common features across a broad taxonomic spectrum in the order Enterobacterales. Here, we report the occurrence of five (flag-1 to flag-5) flagellar loci on the genomes of enterobacterial taxa, as well as the occurrence of three flagellar systems in select members of the Enterobacterales.
    [Show full text]
  • Persistence of Enterobacteriaceae Drawn Into a Marine Saltern (Saline Di Tarquinia, Italy) from the Adjacent Coastal Zone
    water Article Persistence of Enterobacteriaceae Drawn into a Marine Saltern (Saline di Tarquinia, Italy) from the Adjacent Coastal Zone Susanna Gorrasi 1 , Marcella Pasqualetti 1,2 , Andrea Franzetti 3 , Alejandro Gonzalez-Martinez 4,5, Jesus Gonzalez-Lopez 4,5, Barbara Muñoz-Palazon 4,5 and Massimiliano Fenice 1,6,* 1 Dipartimento di Ecologia e Biologia, Università degli Studi della Tuscia, Largo Università snc, 01100 Viterbo, Italy; [email protected] (S.G.); [email protected] (M.P.) 2 Laboratoro di Ecologia dei Funghi Marini CONISMA, Università degli Studi della Tuscia, Largo Università snc, 01100 Viterbo, Italy 3 Dipartimento di Scienze dell’Ambiente e della Terra, Università di Milano-Bicocca, Piazza della Scienza 1, 20126 Milano, Italy; [email protected] 4 Institute of Water Research, University of Granada, C/Ramón y Cajal, 4, 18071 Granada, Spain; [email protected] (A.G.-M.); [email protected] (J.G.-L.); [email protected] (B.M.-P.) 5 Faculty of Pharmacy, Campus de Cartuja, University of Granada, s/n, 18071 Granada, Spain 6 Laboratorio di Microbiologia Marina Applicata, CONISMA, Università degli Studi della Tuscia, Largo Università snc, 01100 Viterbo, Italy * Correspondence: [email protected]; Tel.: +39-0761-357318 Abstract: Enterobacteriaceae is present in various niches worldwide (i.e., the gastrointestinal tracts of animals, clinical specimens, and diverse environments) and hosts some well-known pathogens (i.e., salmonellas, shigellas and pathogenic coliforms). No investigation has focused on its occurrence in marine salterns, and it is not clear if these hypersaline environments could be a reservoir for these Citation: Gorrasi, S.; Pasqualetti, M.; bacteria including some potentially harmful members.
    [Show full text]
  • (Family: Culicidae) Microbiome Diversity and Its Role in Insecticide
    CAPITAL UNIVERSITY OF SCIENCE AND TECHNOLOGY, ISLAMABAD Insilico Analysis of Mosquito (Family: Culicidae) Microbiome Diversity and its Role in Insecticide Resistance by Ahmad Zafar Baig A thesis submitted in partial fulfillment for the degree of Master of Science in the Faculty of Health and Life Sciences Department of Bioinformatics and Biosciences 2020 i Copyright c 2020 by Ahmad Zafar Baig All rights reserved. No part of this thesis may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, by any information storage and retrieval system without the prior written permission of the author. ii I dedicate this thesis to all the great people came in my life specially my beloved Mother and my Supervisor who taught me to stand out in this world with dignity and fearlessly, after that I dedicate it to my lovely sisters that supported me like a solid rock after that to all haters in my life that encouraged me to step ahead without any fear. CERTIFICATE OF APPROVAL Insilico Analysis of Mosquito (Family: Culicidae) Microbiome Diversity and its Role in Insecticide Resistance by Ahmad Zafar Baig (MBS183005) THESIS EXAMINING COMMITTEE S. No. Examiner Name Organization (a) External Examiner Dr. Sobia Tabassum IIU, Islamabad (b) Internal Examiner Dr. Arshia Amin Butt CUST, Islamabad (c) Supervisor Dr. Sahar Fazal CUST, Islamabad Dr. Sahar Fazal Thesis Supervisor December, 2020 Dr. Sahar Fazal Dr. Muhammad Abdul Qadir Head Dean Dept. of Bioinformatics and Biosciences Faculty of Health and Life Sciences December, 2020 December, 2020 iv Author's Declaration I, Ahmad Zafar Baig hereby state that my MS thesis titled \Insilico Analysis of Mosquito (Family: Culicidae) Microbiome Diversity and its Role in Insecticide Resistance" is my own work and has not been submitted previously by me for taking any degree from Capital University of Science and Technology, Islamabad or anywhere else in the country/abroad.
    [Show full text]
  • Effects of Selected Functional Bacteria on Maize Growth and Nutrient Use Efficiency
    microorganisms Article Effects of Selected Functional Bacteria on Maize Growth and Nutrient Use Efficiency Amelia Tang 1 , Ahmed Osumanu Haruna 1,2,3,*, Nik Muhamad Ab. Majid 3 and Mohamadu Boyie Jalloh 4 1 Faculty of Agriculture and Food Sciences, Universiti Putra Malaysia Bintulu Sarawak Campus, Bintulu 97008, Sarawak, Malaysia; [email protected] 2 Institute of Tropical Agriculture and Food Security (ITAFoS), Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia 3 Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia; [email protected] 4 Faculty of Sustainable Agriculture, Universiti Malaysia Sabah, Sandakan Branch, Locked Bag No. 3, Sandakan 90509, Sabah, Malaysia; [email protected] * Correspondence: [email protected] Received: 26 January 2020; Accepted: 18 March 2020; Published: 5 June 2020 Abstract: Plant growth-promoting rhizobacteria (PGPR), which include isolates from genera Paraburkholderia, Burkholderia and Serratia, have received attention due to their numerous plant growth-promoting mechanisms such as their ability to solubilize insoluble phosphates and nitrogen-fixation. However, there is a dearth of information on the potential plant growth-promoting effects of these three groups of bacteria on non-legumes such as maize. This study determined the influences of the aforementioned strains on soil properties, maize growth, nutrient uptake and nutrient use efficiency. A pot trial using maize as a test crop was done using a randomized complete block design with 7 treatments each replicated 7 times. The treatments used in this study were: Control (no fertilizer), chemical fertilizer (CF), organic-chemical fertilizers combination without inoculum (OCF) and with inocula consisting of single strains [cellulolytic bacteria (TC), organic fertilizer and chemical fertilizer with N-fixing bacteria (TN), organic fertilizer and chemical fertilizer with P-solubilizing bacteria (TP)) and three-strain inocula (TCNP), respectively.
    [Show full text]
  • Guidelines for the Preparation of the Country Reports for the State of the World’S Biodiversity for Food and Agriculture
    Guidelines for the preparation of the Country Reports for The State of the World’s Biodiversity for Food and Agriculture November, 2017 Guidelines for the preparation of the Country Reports for The State of the World’s Biodiversity for Food and Agriculture TABLE OF CONTENT I. INTRODUCTION ...................................................................................................... 3 II. OBJECTIVES OF THE GUIDELINES ...................................................................... 5 III. SCOPE, STRUCTURE AND CONTENT ................................................................. 5 IV. TIMELINE AND PROCESS ..................................................................................... 6 V. DETAILED METHODOLOGY AND GUIDANCE BY CHAPTER ....................... 7 EXECUTIVE SUMMARY ............................................................................................ 8 CHAPTER 1: Introduction to the country and to the role of biodiversity for food and agriculture ....................................................................................................................... 8 CHAPTER 2: Drivers of change..................................................................................... 8 CHAPTER 3: The state and trends of biodiversity for food and agriculture .................. 8 CHAPTER 4: The state of use of biodiversity for food and agriculture Erro! Indicador não definido. CHAPTER 5: The state of interventions on conservation and use of biodiversity for food and agriculture .......................................................
    [Show full text]
  • Mobilization of Antibiotic Resistance Genes Differ by Resistance Mechanism
    bioRxiv preprint doi: https://doi.org/10.1101/2021.01.10.426126; this version posted January 11, 2021. 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-ND 4.0 International license. 1 Mobilization of antibiotic resistance genes differ by resistance mechanism 2 Tue Kjærgaard Nielsen1*, Patrick Denis Browne1, Lars Hestbjerg Hansen1* 3 1Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 4 Frederiksberg C, 1871, Denmark 5 *Corresponding author e-mail: [email protected]; [email protected] 6 7 List of abbreviations 8 9 ARG: Antibiotic Resistance Gene 10 MGE: Mobile Genetic Element 11 Tn: Transposon 12 IS: Insertion Sequence 13 AE: Antibiotic Efflux 14 AI: Antibiotic Inactivation 15 ATA: Antibiotic Target Alteration 16 ATR: Antibiotic Target Replacement 17 ATP: Antibiotic Target Protection 18 RPA: Reduced Permeability to Antibiotic 19 20 Abstract 21 22 The degree to which antibiotic resistance genes (ARGs) are mobilized by insertion sequence (IS) 23 elements, plasmids, and integrons has a strong association with their likelihood to function as 24 resistance determinants. This stems from genetic decontextualization where strong promoters 25 often present in IS elements and integrons and the copy number effect of plasmids contribute to 26 high expression of accessory genes. Here, we screen all complete bacterial RefSeq genomes for 27 ARGs. The genetic contexts of detected ARGs are investigated for IS elements, integrons, plasmids, 28 and phylogenetic dispersion. The ARG-MOB scale is proposed which indicates how mobilized 29 detected ARGs are in bacterial genomes.
    [Show full text]
  • The Anopheles Mosquito Microbiota and Their Impact on Pathogen Transmission
    Chapter 17 The Anopheles Mosquito Microbiota and Their Impact on Pathogen Transmission Mathilde Gendrin and George K. Christophides Additional information is available at the end of the chapter http://dx.doi.org/10.5772/55107 1. Introduction An ecosystem is composed of a biological community and its physical environment. A unique ecosystem is the metazoan digestive tract, which contains and interacts with many microor‐ ganisms, e.g. a single human gut contains 1013-1014 bacteria belonging to hundreds of species [4, 5]. These microorganisms are important for the host physiology, particularly in shaping the mucosal immune system [6] and protecting the host against infections by colonization resistance [7]. The term microbiota defines the microbial communities that live in contact with the body epithelia. They are composed of bacteria, viruses, yeasts and protists. To date, the bacterial component of the microbiota is the most studied and best characterized. Studies from Drosophila to mice have revealed that the microbial flora is tightly regulated by the immune system and that failures in this can have detrimental effects on the host [8, 9]. The microbiota composition and numbers undergo significant changes during a host’s lifetime, in particular upon changes of the environment and feeding habits. Anopheles mosquitoes are of great importance to human health. They transmit pathogens including malaria parasites, filarial worms and arboviruses (arthropod-borne viruses). These pathogens infect the mosquito gut when ingested with a bloodmeal, disseminate through the hemolymph (insect blood) to other tissues and are transmitted to a new human host upon another mosquito bite some days later. The time pathogens spend in mosquitoes is known as extrinsic incubation period.
    [Show full text]
  • 1587362612 751 2.Pdf
    International Journal of Food Microbiology 311 (2019) 108357 Contents lists available at ScienceDirect International Journal of Food Microbiology journal homepage: www.elsevier.com/locate/ijfoodmicro Commensal E. coli rapidly transfer antibiotic resistance genes to human intestinal microbiota in the Mucosal Simulator of the Human Intestinal T Microbial Ecosystem (M-SHIME) Ellen Lambrechta,b, Els Van Coillieb, Eva Van Meervennea,b, Nico Boona, Marc Heyndrickxb,c, ⁎ Tom Van de Wielea, a CMET, Center for Microbial Ecology and Technology, Ghent University, Coupure links 653, 9000 Gent, Belgium b ILVO, Flanders Research Institute for Agriculture, Fisheries and Food, Brusselsesteenweg 370, 9090 Melle, Belgium c Department of Pathology, Bacteriology and Avian Diseases, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium ARTICLE INFO ABSTRACT Keywords: Food-producing animals are indicated as a reservoir of antibiotic resistance genes and a potential vector for Human gut microbiota transmission of plasmid-encoded antibiotic resistance genes by conjugation to the human intestinal microbiota. Escherichia coli In this study, transfer of an antibiotic resistance plasmid from a commensal E. coli originating from a broiler Antimicrobial resistance chicken towards the human intestinal microbiota was assessed by using a Mucosal Simulator of the Human Resistance transfer Intestinal Microbial Ecosystem (M-SHIME). This in vitro model mimics the human intestinal ecosystem and Plasmid transfer received a single dose of 109 E. coli MB6212, which harbors a plasmid known to confer resistance towards several antibiotics including tetracycline, sulfamethoxazole and cefotaxime. Since the degree of stress imposed by stomach pH and bile acids vary with the consumed meal size, the effect of meal size on E.
    [Show full text]