Antony Van Leeuwenhoek: Creation “Magnified” Through His Magnificent Microscopes
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The Influence of Probiotics on the Firmicutes/Bacteroidetes Ratio In
microorganisms Review The Influence of Probiotics on the Firmicutes/Bacteroidetes Ratio in the Treatment of Obesity and Inflammatory Bowel disease Spase Stojanov 1,2, Aleš Berlec 1,2 and Borut Štrukelj 1,2,* 1 Faculty of Pharmacy, University of Ljubljana, SI-1000 Ljubljana, Slovenia; [email protected] (S.S.); [email protected] (A.B.) 2 Department of Biotechnology, Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia * Correspondence: borut.strukelj@ffa.uni-lj.si Received: 16 September 2020; Accepted: 31 October 2020; Published: 1 November 2020 Abstract: The two most important bacterial phyla in the gastrointestinal tract, Firmicutes and Bacteroidetes, have gained much attention in recent years. The Firmicutes/Bacteroidetes (F/B) ratio is widely accepted to have an important influence in maintaining normal intestinal homeostasis. Increased or decreased F/B ratio is regarded as dysbiosis, whereby the former is usually observed with obesity, and the latter with inflammatory bowel disease (IBD). Probiotics as live microorganisms can confer health benefits to the host when administered in adequate amounts. There is considerable evidence of their nutritional and immunosuppressive properties including reports that elucidate the association of probiotics with the F/B ratio, obesity, and IBD. Orally administered probiotics can contribute to the restoration of dysbiotic microbiota and to the prevention of obesity or IBD. However, as the effects of different probiotics on the F/B ratio differ, selecting the appropriate species or mixture is crucial. The most commonly tested probiotics for modifying the F/B ratio and treating obesity and IBD are from the genus Lactobacillus. In this paper, we review the effects of probiotics on the F/B ratio that lead to weight loss or immunosuppression. -
하구 및 연안생태학 Estuarine and Coastal Ecology
하구 및 연안생태학 Estuarine and coastal ecology 2010 년 11월 2 계절적 변동 • 빛과 영양염분의 조건에 따라 • 봄 가을 대발생 계절적 변동 Sverdrup 에 의한 대발생 모델 • Compensation depth (보상심도) • Critical depth (임계수심) Sverdrup 에 의한 대발생 모델 홍재상외, 해양생물학 Sverdrup 에 의한 대발생 모델 봄 여름 가을 겨울 수심 혼합수심 임계수심 (mixed layer depth) (critical depth) Sverdrup 에 의한 대발생 모델 봄 여름 가을 겨울 수심 혼합수심 임계수심 (mixed layer depth) (critical depth) Diatoms (규조류) • Bacillariophyceae (1 fragment of centrics, 19 fragments of pennates in Devonian marble in Poland Kwiecinska & Sieminska 1974) Diatoms (규조류) • Bacillariophyceae • Temperate and high latitude (everywhere) Motility: present in pennate diatoms with a raphe (and male gametes) Resting cells (spores): heavily silicified, often with spines (Î보충설명) Biotopes: marine and freshwater, plankton, benthos, epiphytic, epizooic (e.g., on whales, crustaceans) endozoic, endophytic, discolouration of arctic and Antarctic sea ice Snow Algae (규조류 아님) Snow algae describes cold-tolerant algae and cyanobacteria that grow on snow and ice during alpine and polar summers. Visible algae blooms may be called red snow or watermelon snow. These extremophilic organisms are studied to understand the glacial ecosystem. Snow algae have been described in the Arctic, on Arctic sea ice, and in Greenland, the Antarctic, Alaska, the west coast, east coast, and continental divide of North America, the Himalayas, Japan, New Guinea, Europe (Alps, Scandinavia and Carpathians), China, Patagonia, Chile, and the South Orkney Islands. Diatoms (규조류) • Bacillariophyceae • Temperate and high latitude (everywhere) • 2~1000 um • siliceous frustules • Various patterns in frustule Centric vs Pennate Centric diatom Pennete small discoid plastid large plate plastid Navicula sp. -
Antony Van Leeuwenhoek, the Father of Microscope
Turkish Journal of Biochemistry – Türk Biyokimya Dergisi 2016; 41(1): 58–62 Education Sector Letter to the Editor – 93585 Emine Elif Vatanoğlu-Lutz*, Ahmet Doğan Ataman Medicine in philately: Antony Van Leeuwenhoek, the father of microscope Pullardaki tıp: Antony Van Leeuwenhoek, mikroskobun kaşifi DOI 10.1515/tjb-2016-0010 only one lens to look at blood, insects and many other Received September 16, 2015; accepted December 1, 2015 objects. He was first to describe cells and bacteria, seen through his very small microscopes with, for his time, The origin of the word microscope comes from two Greek extremely good lenses (Figure 1) [3]. words, “uikpos,” small and “okottew,” view. It has been After van Leeuwenhoek’s contribution,there were big known for over 2000 years that glass bends light. In the steps in the world of microscopes. Several technical inno- 2nd century BC, Claudius Ptolemy described a stick appear- vations made microscopes better and easier to handle, ing to bend in a pool of water, and accurately recorded the which led to microscopy becoming more and more popular angles to within half a degree. He then very accurately among scientists. An important discovery was that lenses calculated the refraction constant of water. During the combining two types of glass could reduce the chromatic 1st century,around year 100, glass had been invented and effect, with its disturbing halos resulting from differences the Romans were looking through the glass and testing in refraction of light (Figure 2) [4]. it. They experimented with different shapes of clear glass In 1830, Joseph Jackson Lister reduced the problem and one of their samples was thick in the middle and thin with spherical aberration by showing that several weak on the edges [1]. -
Dress and Cultural Difference in Early Modern Europe European History Yearbook Jahrbuch Für Europäische Geschichte
Dress and Cultural Difference in Early Modern Europe European History Yearbook Jahrbuch für Europäische Geschichte Edited by Johannes Paulmann in cooperation with Markus Friedrich and Nick Stargardt Volume 20 Dress and Cultural Difference in Early Modern Europe Edited by Cornelia Aust, Denise Klein, and Thomas Weller Edited at Leibniz-Institut für Europäische Geschichte by Johannes Paulmann in cooperation with Markus Friedrich and Nick Stargardt Founding Editor: Heinz Duchhardt ISBN 978-3-11-063204-0 e-ISBN (PDF) 978-3-11-063594-2 e-ISBN (EPUB) 978-3-11-063238-5 ISSN 1616-6485 This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 04. International License. For details go to http://creativecommons.org/licenses/by-nc-nd/4.0/. Library of Congress Control Number:2019944682 Bibliographic information published by the Deutsche Nationalbibliothek The Deutsche Nationalbibliothek lists this publication in the Deutsche Nationalbibliografie; detailed bibliographic data are available on the Internet at http://dnb.dnb.de. © 2019 Walter de Gruyter GmbH, Berlin/Boston The book is published in open access at www.degruyter.com. Typesetting: Integra Software Services Pvt. Ltd. Printing and Binding: CPI books GmbH, Leck Cover image: Eustaţie Altini: Portrait of a woman, 1813–1815 © National Museum of Art, Bucharest www.degruyter.com Contents Cornelia Aust, Denise Klein, and Thomas Weller Introduction 1 Gabriel Guarino “The Antipathy between French and Spaniards”: Dress, Gender, and Identity in the Court Society of Early Modern -
Flagellum Couples Cell Shape to Motility in Trypanosoma Brucei
Flagellum couples cell shape to motility in Trypanosoma brucei Stella Y. Suna,b,c, Jason T. Kaelberd, Muyuan Chene, Xiaoduo Dongf, Yasaman Nematbakhshg, Jian Shih, Matthew Doughertye, Chwee Teck Limf,g, Michael F. Schmidc, Wah Chiua,b,c,1, and Cynthia Y. Hef,h,1 aDepartment of Bioengineering, James H. Clark Center, Stanford University, Stanford, CA 94305; bDepartment of Microbiology and Immunology, James H. Clark Center, Stanford University, Stanford, CA 94305; cSLAC National Accelerator Laboratory, Stanford University, Menlo Park, CA 94025; dDepartment of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX 77030; eVerna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, TX 77030; fMechanobiology Institute, National University of Singapore, Singapore 117411; gDepartment of Mechanical Engineering, National University of Singapore, Singapore 117575; and hDepartment of Biological Sciences, Center for BioImaging Sciences, National University of Singapore, Singapore 117543 Contributed by Wah Chiu, May 17, 2018 (sent for review December 29, 2017; reviewed by Phillipe Bastin and Abraham J. Koster) In the unicellular parasite Trypanosoma brucei, the causative Cryo-electron tomography (cryo-ET) allows us to view 3D agent of human African sleeping sickness, complex swimming be- supramolecular details of biological samples preserved in their havior is driven by a flagellum laterally attached to the long and proper cellular context without chemical fixative and/or metal slender cell body. Using microfluidic assays, we demonstrated that stain. However, samples thicker than 1 μm are not accessible to T. brucei can penetrate through an orifice smaller than its maxi- cryo-ET because at typical accelerating voltages (≤300 kV), few mum diameter. -
Draperies Make Your Own
RSlTV Of CULTURE DRAPERIES MAKE YOUR OWN . ARE DRAPERIES ON THE AGENDA for your next 15 stitches per inch; for medium-weight fabrics, 10 home furnishings project? By making your to 12 stitches per inch will give good results. For all own, you can save money and enjoy a sense of ac- stitching on draperies use a loose tension to avoid complishment. This booklet will help you sew drap- puckers on seams and hemlines. eries with a custom-made look in any color, texture, and design you choose. Measuring Length and Width The length of your draperies is a matter of per- SEWING PREPARATIONS sonal taste, as there are several generally accepted Select the appropriate thread and sewing machine lengths. In casual decorating, draperies may go needles for the fabric you choose. The thread should down to the sill or to the apron ; more formal drap- be about the same color and weight as the drapery eries go to the floor. Also, draperies may be hung fabric: for cotton or linen draperies, use mercerized from any of a number of places — from the top of thread; for synthetic fabrics, use synthetic thread. the window frame, at ceiling height, or from any If you use mercerized thread, use a number 14 point on the wall between the ceiling and the window needle; for synthetic thread, a number 11 needle is frame ( see Fig. 1 ) recommended. The width of the draperies depends on how much Cut a small swatch of the drapery fabric and test window you want exposed when the draperies are your sewing machine's stitch and tension. -
Volvox Barberi Flocks, Forming Near-Optimal, Two
bioRxiv preprint doi: https://doi.org/10.1101/279059; this version posted March 8, 2018. 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. Volvox barberi flocks, forming near-optimal, two-dimensional, polydisperse lattice packings Ravi Nicholas Balasubramanian1 1Harriton High School, 600 North Ithan Avenue, Bryn Mawr, PA 19010, USA Volvox barberi is a multicellular green alga forming spherical colonies of 10000-50000 differentiated somatic and germ cells. Here, I show that these colonies actively self-organize over minutes into “flocks" that can contain more than 100 colonies moving and rotating collectively for hours. The colonies in flocks form two-dimensional, irregular, \active crystals", with lattice angles and colony diameters both following log-normal distributions. Comparison with a dynamical simulation of soft spheres with diameters matched to the Volvox samples, and a weak long-range attractive force, show that the Volvox flocks achieve optimal random close-packing. A dye tracer in the Volvox medium revealed large hydrodynamic vortices generated by colony and flock rotations, providing a likely source of the forces leading to flocking and optimal packing. INTRODUCTION behavior (see, e.g., [8, 9] and references therein) but their interactions are often dominated by viscous forces (e.g. fluid drag) unlike larger organisms which are The remarkable multicellular green alga Volvox barberi dominated by inertial forces. Here, I show that V. [1] forms spherical colonies of 10,000 to 50,000 cells barberi colonies, which are themselves composed of many embedded in a glycol-protein based extra cellular matrix individual cells acting together, show collective behavior (ECM) and connected by cytoplasmic bridges that may at a higher level of organization. -
I Was Tempted by a Pretty Coloured Muslin
“I was tempted by a pretty y y coloured muslin”: Jane Austen and the Art of Being Fashionable MARY HAFNER-LANEY Mary Hafner-Laney is an historic costumer. Using her thirty-plus years of trial-and-error experience, she has given presentations and workshops on how women of the past dressed to historical societies, literary groups, and costuming and re-enactment organizations. She is retired from the State of Washington . E E plucked that first leaf o ff the fig tree in the Garden of Eden and decided green was her color, women of all times and all places have been interested in fashion and in being fashionable. Jane Austen herself wrote , “I beleive Finery must have it” (23 September 1813) , and in Northanger Abbey we read that Mrs. Allen cannot begin to enjoy the delights of Bath until she “was provided with a dress of the newest fashion” (20). Whether a woman was like Jane and “so tired & ashamed of half my present stock that I even blush at the sight of the wardrobe which contains them ” (25 December 1798) or like the two Miss Beauforts in Sanditon , who required “six new Dresses each for a three days visit” (Minor Works 421), dress was a problem to be solved. There were no big-name designers with models to show o ff their creations. There was no Project Runway . There were no department stores or clothing empori - ums where one could browse for and purchase garments of the latest fashion. How did a woman achieve a stylish appearance? Just as we have Vogue , Elle and In Style magazines to keep us up to date on the most current styles, women of the Regency era had The Ladies Magazine , La Belle Assemblée , Le Beau Monde , The Gallery of Fashion , and a host of other publications (Decker) . -
Introduction to the Cell Cell History Cell Structures and Functions
Introduction to the cell cell history cell structures and functions CK-12 Foundation December 16, 2009 CK-12 Foundation is a non-profit organization with a mission to reduce the cost of textbook materials for the K-12 market both in the U.S. and worldwide. Using an open-content, web-based collaborative model termed the “FlexBook,” CK-12 intends to pioneer the generation and distribution of high quality educational content that will serve both as core text as well as provide an adaptive environment for learning. Copyright ©2009 CK-12 Foundation This work is licensed under the Creative Commons Attribution-Share Alike 3.0 United States License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/3.0/us/ or send a letter to Creative Commons, 171 Second Street, Suite 300, San Francisco, California, 94105, USA. Contents 1 Cell structure and function dec 16 5 1.1 Lesson 3.1: Introduction to Cells .................................. 5 3 www.ck12.org www.ck12.org 4 Chapter 1 Cell structure and function dec 16 1.1 Lesson 3.1: Introduction to Cells Lesson Objectives • Identify the scientists that first observed cells. • Outline the importance of microscopes in the discovery of cells. • Summarize what the cell theory proposes. • Identify the limitations on cell size. • Identify the four parts common to all cells. • Compare prokaryotic and eukaryotic cells. Introduction Knowing the make up of cells and how cells work is necessary to all of the biological sciences. Learning about the similarities and differences between cell types is particularly important to the fields of cell biology and molecular biology. -
Introduction to Bacteriology and Bacterial Structure/Function
INTRODUCTION TO BACTERIOLOGY AND BACTERIAL STRUCTURE/FUNCTION LEARNING OBJECTIVES To describe historical landmarks of medical microbiology To describe Koch’s Postulates To describe the characteristic structures and chemical nature of cellular constituents that distinguish eukaryotic and prokaryotic cells To describe chemical, structural, and functional components of the bacterial cytoplasmic and outer membranes, cell wall and surface appendages To name the general structures, and polymers that make up bacterial cell walls To explain the differences between gram negative and gram positive cells To describe the chemical composition, function and serological classification as H antigen of bacterial flagella and how they differ from flagella of eucaryotic cells To describe the chemical composition and function of pili To explain the unique chemical composition of bacterial spores To list medically relevant bacteria that form spores To explain the function of spores in terms of chemical and heat resistance To describe characteristics of different types of membrane transport To describe the exact cellular location and serological classification as O antigen of Lipopolysaccharide (LPS) To explain how the structure of LPS confers antigenic specificity and toxicity To describe the exact cellular location of Lipid A To explain the term endotoxin in terms of its chemical composition and location in bacterial cells INTRODUCTION TO BACTERIOLOGY 1. Two main threads in the history of bacteriology: 1) the natural history of bacteria and 2) the contagious nature of infectious diseases, were united in the latter half of the 19th century. During that period many of the bacteria that cause human disease were identified and characterized. 2. Individual bacteria were first observed microscopically by Antony van Leeuwenhoek at the end of the 17th century. -
Distribution and Characteristics of Bacillus Bacteria Associated with Hydrobionts and the Waters of the Peter the Great Bay, Sea of Japan I
ISSN 0026-2617, Microbiology, 2008, Vol. 77, No. 4, pp. 497–503. © Pleiades Publishing, Ltd., 2008. Original Russian Text © I.A. Beleneva, 2008, published in Mikrobiologiya, 2008, Vol. 77, No. 4, pp. 558–565. EXPERIMENTAL ARTICLES Distribution and Characteristics of Bacillus Bacteria Associated with Hydrobionts and the Waters of the Peter the Great Bay, Sea of Japan I. A. Beleneva1 Zhirmunskii Institute of Marine Biology, Far East Division, Russian Academy of Sciences, ul. Pal’chevskogo, 17, Vladivostok 690041, Russia Received May 28, 2007 Abstract—Bacilli of the species Bacillus subtilis, B. pumilus, B. mycoides, B. marinus and B. licheniformis (a total of 53 strains) were isolated from 15 invertebrate species and the water of the Vostok Bay, Peter the Great Bay, Sea of Japan. Bacilli were most often isolated from bivalves (22.7%) and sea cucumbers (18.9%); they occurred less frequently in sea urchins and starfish (13.2 and 7.5%, respectively). Most of bacilli strains were isolated from invertebrates inhabiting silted sediments. No Bacillus spp. strains were isolated from invertebrates inhabiting stony and sandy environments. The species diversity of bacilli isolated from marine objects under study was low. Almost all bacterial isolates were resistant to lincomycin. Unlike B. pumilus, B. subtilis isolates were mostly resistant to benzylpenicillin and ampicillin. Antibiotic sensitivity of B. licheniformis strains was variable (two strains were resistant to benzylpenicillin and oxacillin, while one was sensitive). A significant fraction of isolated bacilli contained pigments. Pigmented strains were more often isolated from seawater sam- ples, while colorless ones predominated within hydrobionts. B. subtilis colonies had the broadest range of co- lors. -
The Life of Saint Francis of Assisi
✦✦ My God and My All The Life of Saint Francis of Assisi • ELIZABETH GOUDGE • #1 NEW YORK TIMES BESTSELLING AUTHOR My God and My All This is a preview. Get entire book here. Elizabeth Goudge My God and My All The Life of Saint Francis of Assisi Plough Publishing House This is a preview. Get entire book here. Published by Plough Publishing House Walden, New York Robertsbridge, England Elsmore, Australia www.plough.com Copyright © 1959 by Elizabeth Goudge. Copyright renewed 1987 by C. S. Gerald Kealey and Jessie Monroe. All rights reserved. First published in 1959 as Saint Francis of Assisi in London (G. Duckworth) and as My God and My All in New York (Coward-McCann). Cover image: El Greco, Saint Francis in Prayer, 1577, oil on canvas, in Museo Lazaro Galdiano, Madrid. Image source: akg-images. ISBN: 978-0-87486-678-0 20 19 18 17 16 15 1 2 3 4 5 6 Library of Congress Cataloging-in-Publication Data Goudge, Elizabeth, 1900-1984. My God and my all : the life of St. Francis of Assisi / Elizabeth Goudge. pages cm Reprint of: New York : Coward-McCann, ?1959. Includes bibliographical references. ISBN 978-0-87486-678-0 (pbk.) 1. Francis, of Assisi, Saint, 1182-1226. I. Title. BX4700.F6G6 2015 271’.302--dc23 [B] 2015008696 Printed in the U.S.A. This is a preview. Get entire book here. Author’s Note Such a number of books have been written about Saint Francis, and so many of them works of scholarship, that a writer who is not a scholar should apologize for the presumption of attempting yet another.