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Protistology - Science topic

devoted to the study of protists and protozoans
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Publications related to Protistology (190)
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Science in general, and microscopy in particular, lagged far behind Europe in early 19th century America. Jacob Bailey was one of the very few American microscopists. In eulogies he was called 'the Ehrenberg of America' and 'the founder of microscopical research'. He was a major figure in the scientific community of America in his time and instrume...
Article
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Louis Joblot published one of the first manuals of microscopy in 1718, just a few years before both he and Leeuwenhoek died. It contained Joblot's microscope designs and his extensive observations on microorganisms including experiments on spontaneous generation. Joblot's work and his observations have often been overlooked, misdated, and denigrate...
Article
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Protists are essential components of soil biodiversity and ecosystem functioning. They play a vital role in the microbial food web as consumers of bacteria, fungi, and other small eukaryotes and are also involved in maintaining soil fertility and plant productivity. Protists also contribute to regulating and shaping the bacterial community in terre...
Article
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Charles Atwood Kofoid was a scientist of considerable stature and a key figure in the development of protistology in the United States of America during first half of the 20th century. Today he is known mainly for his detailed taxonomic monographs on protists of the marine plankton, specifically dinoflagellates and tintinnid ciliates. Lesser known...
Article
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Acanthamoeba castellanii is an amoeba host that was used to isolate a novel strain named pacmanvirus S19. This isolate is the second strain reported and belongs to the extended Asfarviridae family. Pacmanvirus S19 harbors a 419,588-bp genome, with a GC content of 33.20%, which encodes 444 predicted proteins and a single Ile-tRNA.
Article
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Accounts are given of the lives and careers of Edouard Claparède (1832-1871) and Johannes Lachmann (1832-1860), the authors of the landmark work of 19th century protistology “Etudes sur les Infusoires et les Rhizopodes”, published in 3 parts in 1859, 1860 and 1861. Accounts are also given on the origin of the monograph, the relationship of Claparèd...
Book
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Microbiology is the study of microorganisms, those being unicellular (single cell), multicellular (cell colony), or acellular (lacking cells). Microbiology encompasses numerous sub-disciplines including virology, bacteriology, protistology, mycology, immunology and parasitology. Eukaryotic microorganisms possess membrane-bound organelles and inclu...
Article
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The species Metchnikovella dogieli (Paskerova et al. Protistology 10:148–157, 2016) belongs to one of the early diverging microsporidian groups, the metchnikovellids (Microsporidia: Metchnikovellidae). In relation to typical (‘core’) microsporidia, this group is considered primitive. The spores of metchnikovellids have no classical polar sac-anchor...
Article
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Since the advent of deep-sea microbiology in the 1950's, microbiologists have justifiably recognized Adrien Certes as a pioneer due to his early studies on culturing deep-sea bacteria, and investigating the effects of pressure on microorganisms. However, Certes was actually first and foremost a protistologist. He was but a 'part-time' scientist, wi...
Article
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The article describes four epibiont suctorian ciliates, viz. Thecacineta cothurnioides (Collin, 1909) and Trematosoma rotunda (Allgén, 1952) on the nematode Tricoma sp., Thecacineta calix (Schröder, 1907) and Acineta tuberosa Ehrenberg, 1834 on the harpacticoid copepod, from the Karwar coast of India (Karnataka state), the Arabian Sea. Trematosoma...
Article
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The article describes a new species of monoxenous trypanosomatids Blastocrithidia frustrata from brown marmorated stink bugs Halyomorpha halys collected in the south of Russia (Sochi) and Abkhazia (Sukhumi). A unique morphological feature distinguishing this new species from the earlier described representatives of the genus Blastocrithidia is a de...
Article
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Liebermannia dichroplusae is an intracellular parasite that develops in the epithelium cells of the Malpighian tubules of the univoltine melanopline Dichroplus elongatus, a common and widespread grasshopper in southern South America that readily becomes an agricultural pest when outbreaks occur. Heavy infections by L. dichroplusae cause conspicuous...
Preprint
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Protists - all eukaryotes besides fungi, animals, and plants - represent a major part of the taxonomic and functional diversity of eukaryotic life on the planet and drive many ecosystem processes. However, knowledge of protist communities and their diversity lags behind that of most other groups of organisms, largely due to methodological constrain...
Article
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In 1703 two articles appeared in the Transactions of the Royal Society, authored by an unnamed gentleman. The articles, with deference to Leeuwenhoeck, described recent observations made with a microscope. Clifford Dobell, in his biography of Leeuwenhoeck, remarked at length on the extraordinary quality of the illustrations and descriptions of "ani...
Conference Paper
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Ion-translocating pyrophosphatases (mPPases) are integral membrane proteins that use the chemical energy of inorganic pyrophosphate (PPi) for the vectorial transport of ions (H+ or Na+) and subsequent generation of electrochemical gradients. Nuclear genomes of plants and many microorganisms (prokaryotes and protists) encode distinct types of m-PPas...
Article
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The aim of this study was to determine the cultivability of E. faecalis and enteropathogenic E. coli (EPEC) under different light intensities in the presence of different concentrations of mercury chloride (HgCl 2) and biodegradable organic compound (BOC). Studied light intensities were 0, 500, 1000, 1500 and 2000 lux while studied HgCl 2 concentra...
Poster
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The Muséum national d’Histoire naturelle (MNHN) of Paris, France, houses collections of major importance in the history of palaeontology and particularly of micropalaeontology. The contributors of these collections are diverse, from MNHN researchers to institutions as the French Oil Institute, scientists and explorers as Jean-Baptiste Charcot, Jacq...
Article
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Bacterial virulence factors are attractive targets for the development of therapeutics. Type IV pili, which are associated with a remarkable array of properties including motility, the interaction between bacteria and attachment to biotic and abiotic surfaces, represent particularly appealing virulence factor targets. Type IV pili are present in nu...
Article
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One of the mechanisms of rapid adaptation or acclimatization to environmental changes in corals is through the dynamics of the composition of their associated endosymbiotic Symbiodiniaceae community. The various species of these dinoflagellates are characterized by different biological properties, some of which can confer stress tolerance to the co...
Article
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We present an extension of the Minimum Information about any (x) Sequence (MIxS) standard for reporting sequences of uncultivated virus genomes. Minimum Information about an Uncultivated Virus Genome (MIUViG) standards were developed within the Genomic Standards Consortium framework and include virus origin, genome quality, genome annotation, taxon...
Article
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Abstract Joel Dacks is an Associate Professor and Canada Research Chair in Evolutionary Cell Biology at the University of Alberta, a Scientific Associate at the Natural History Museum (London), and the current President of the International Society for Evolutionary Protistology. His research group studies the evolution and diversity of the eukaryot...
Article
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Persisters form sub-populations of stress-tolerant cells that play a major role in the capacity of biofilms to survive and recover from disturbances such as antibiotic treatments. The mechanisms of persistence are diverse and influenced by environmental conditions, and persister populations are more heterogeneous than formerly suspected. We used co...
Article
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Background: ART in the developing world has moved to a new era with the WHO recommendation to test and immediately treat HIV-positive individuals. A high frequency of pretreatment HIV drug resistance (PDR) can compromise ART efficacy. Our study presents updated estimates of PDR in seven countries from West Africa (Burkina Faso, Cameroon, Côte d'Iv...
Article
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xThough microbial processes in the oxygen minimum zones (OMZs) of the Arabian Sea (AS) are well documented, prokaryote-virus interactions are less known. The present study was carried out to determine the potential physico-chemical factors influencing viral abundances and their life strategies (lytic and lysogenic) along the vertical gradient in th...
Article
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Introduction. Intestinal parasitic infections are a major public health problem in inter-tropical areas. The aim of our study was to describe the situation in Mahajanga, Madagascar with a particular focus on two protozoa, Dientamoeba fragilis and Blastocystis sp.. Methods. This was a prospective study from February to June 2015. Stool samples from...
Article
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Background Rapid tests for HIV testing are essential tools to achieve the 90-90-90 target of the World Health Organization. Many tests are available, some directly from websites. Evaluation of the performance of rapid tests, under close to real-life usage, is therefore needed to ensure accurate diagnosis in the context of the recommendation for the...
Article
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The study focuses on the biomorphology of crustaceans of the Matourou stream at Nkoukoum in the Central region of Cameroon. Two species of shrimp (Caridina sp. and Macrobrachium sp.) and three morphotypes of the Soudanonautes crab were harvested, identified and characterized. Caridina sp. of small size (10-30 mm)is characterized by a dorso-ventrall...
Article
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A study was carried out on Aeromonas hydrophila adhesion to polythene fragment at different cell growth phases in aquatic microcosm. The main purpose of this study was to assess adsorption capacity, adsorption intensity and kinetics of Aeromonas hydrophila on polythene in sodium hypochlorite (NaOCl) and hydrogen peroxide (H2O2) disinfected water. T...
Article
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Morphological and infraciliature studies carried out using pyridinated ammoniacal silver carbonate and the 4’,6-diamidino-2-phenylindole (DAPI) staining techniques, led to the identification of two new species of ciliates pertaining to the subclass Astomatia. The first species, Hoplitophrya polymorphus sp. nov., displays two main cellular forms: th...
Article
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Since the advent of DNA metabarcoding surveys, the planktonic realm is considered a treasure trove of diversity, inhabited by a small number of abundant taxa, and a hugely diverse and taxonomically uncharacterized consortium of rare species. Here we assess if the apparent underestimation of plankton diversity applies universally. We target plankton...
Article
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Parasites exist in every ecosystem and can have large influence on food web structure and function, yet, we know little about parasites' effect on food web dynamics. Here we investigate the role of microbial parasitism (viruses of bacteria, phytoplankton and cyanobacteria, and parasitic chytrids on cyanobacteria) on the dynamics of trophic pathways...
Article
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Prokina K.I., Zagumyonnyi D.G., Philippov D.A. 2017. Centrohelids in the mires of Northern Russia. Protistology, 11(1): 3–19. DOI: 10.21685/1680-0826-2017-11-1-1 The species composition and morphology of centrohelid heliozoa collected from mire water bodies of different types in the North of the European part of Russia were studied. Eighteen specie...
Article
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We sequenced the first Bovine coronavirus (BCoV) complete genome sequence from France. This BCoV was directly sequenced from a fecal sample collected from a calf in Normandy in 2014.
Article
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Current information on the response of phytoplankton to turbulence is linked to cell size and nutrient availability. Diatoms are considered to be favored by mixing as dissolved nutrients are more easily accessible for non-motile cells. We investigated how diatoms exploit microscale turbulence under nutrient repletion and depletion conditions. Here,...
Article
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The bewildering organismal and functional complexity of microbial eukaryotes has long fascinated protistologists but exceeded the capacity of this research community to comprehensively study it. Lacking the critical mass for a strong scientific discipline, protistologists remain largely divided into various sub-communities (protozoology versus phyc...
Article
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Measles outbreaks are regularly reported in European countries despite efforts to improve vaccination coverage. In January 2016, an outbreak occurred in a refugee settlement in Calais, France. We report here the complete genome sequence of a wild-type measles virus isolated from a health care worker (MVi/Calais. FRA/01.16) infected during this outb...
Article
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The study of cultured strains has a long tradition in protistological research and has greatly contributed to establishing the morphology, taxonomy and ecology of many protist species. However, cultivation-independent techniques, based on 18S rRNA gene sequences, have demonstrated that natural protistan assemblages mainly consist of hitherto uncult...
Article
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We report a of the symposium “Stress and Protists: No life without stress”, which was held in September 2015 on the VII European Congress of Protistology in partnership with the International Society of Protistologists (Seville, Spain). We present an overview on general comments and concepts on cellular stress which can be also applied to any proti...
Article
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Importance: Direct studies on marine picoeukaryotes by epifluorescence microscopy are problematic due to the lack of morphological features, in addition to the limited number and poor resolution of specific phylogenetic probes used in FISH routines. As a consequence, there is an increasing use of molecular methods, including high-throughput sequen...
Poster
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Many states use red lists of nearly all groups of organisms to protect their natural biodiversity. Nevertheless, the practical protection of protist organisms, including microalgae, is still almost completely missing. Compiling red lists of microorganisms is a quite challenging task requiring knowledge of ecology, distribution, and endangering fact...
Article
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Background Severe acute respiratory illness (SARI) is recognized as an important cause of morbidity, mortality, and hospitalization among children in developing countries. Little is known, however, in tropical countries like Cameroon about the cause and seasonality of respiratory infections, especially in hospitalized settings.Objectives: Our study...
Article
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Photosynthetic protists, also called microalgae, have been systematically studied for more than a century. However, only recently broad biotechnological applications have fostered a novel wave of research on their potentialities as sustainable resources of renewable energy as well as valuable industrial and agro-food products. At the recent VII Eur...
Thesis
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La cuestión sobre la cognición en organismos sin sistema nervioso es el principal objetivo de mi trabajo de investigación. De hecho, la pregunta por la cognición en sí es una pregunta irresoluble. Nos hemos atrevido a cuestionar la pregunta hacia los organismos primitivos, carentes de sistema nervioso. Fue Humberto Maturana, que en 1970, en su lib...
Article
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Among 23 species of tintinnid ciliates known for the Black Sea, nine nonindigenous species (Eutintinnus lususundae, E. tubulosus, E. apertus, Eutintinnus sp., Salpingella decurtata, Tintinnopsis tocantinensis, Rhizodomus tagatzi, Amphorellopsis acuta and Nolaclusilis sp.) were registered in the Sevastopol Bay and the adjacent coastal regions of the...
Article
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In the bottom sediments of the Caspian Sea, which have been selected with a modern instrument (multikorer), have been found biomorphic structures. Location biomorphic structures associated with hydrogen sulphide contaminated region. Biomorphic structures have been found only in the recovered bottom sediments in two abbysal trough, in other piece of...
Article
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The main objective of this study was to assess the diagnostic performance of a set of three Mucorales quantitative PCR assays in a retrospective multicentre study. Mucormycosis cases were recorded thanks to the French prospective surveillance programme (RESSIF network). The day of sampling of the first histological or mycological positive specimen...
Conference Paper
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On behalf of the Organizing Committee, it is our great pleasure to welcome you to Seville and to the VII European Congress of Protistology (VII ECOP), hosted by the Specialized Group of Protistology (Grupo Especializado de Protistología, GEP) of the Spanish Society of Microbiology. The European Congresses of Protistology (ECOP) are the most visible...
Article
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Dissection of the subcellular eye of microorganisms called warnowiid dinoflagellates reveals that this structure is composed of elements of two cellular organelles - the plastid and the mitochondrion. See Letter p.204
Article
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Microbial communities driving the nitrogen cycle contribute to ecosystem services such as crop production and air, soil, and water quality. The responses to herbicide stress of ammonia-oxidizing and ammonia-denitrifying microbial communities were investigated by an analysis of changes in structure-function relationships. Their potential activities,...
Article
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Soil containing the earthworms (Fokam, 2012, was dug monthly for six months. Worms where counted in situ to establish earthworm's volumic density (VD) and subsequently dissected to evaluate cil Ten soil physicochemical parameters were analyzed: Cation Exchange Capacity (CEC), Mg Available Moisture (M), and pH. The studies reveal for Dicoelophrya nk...
Article
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Centers for Disease Control and Prevention built up new surveillance paradigms for the patients on mechanical ventilation and the ventilator-associated events, comprising ventilator-associated conditions and infection-related ventilator-associated complications. We assess 1) the current epidemiology of ventilator-associated event, 2) the relationsh...
Poster
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Methods DNA-Extraction, amplification and NGS of 150 grassland samples in the three Biodiversity Exploratory plots (Schorfheide-Chorin, Schwäbische Alb and Hainich-Dün) were performed. PCR for NGS were done for the highly variable V4-region of the SSU rDNA. Sequences were blasted to the well curated Protist Ribosomal Reference database (PR 2). Sequ...
Conference Paper
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It is crucial to get young people engaged in science as there has been a world-wide decline in numbers of students enrolling science courses. Improving and integrating effective practical courses can be one of the possible ways how to increase students’ interest in science. The contribution of practical courses is seen mainly in developing students...
Book
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Ova knjiga je zamišljena kao pregled savremenih znanja iz opšte protistologije, biološke nauke koja ima za cilj svestrano izučavanje fenotipske i genotipske prirode najstarijih eukariotskih organizama na Zemlji – protista. Knjiga je namenjena svima koji žele da saznaju više o protistima, odnosno da se upoznaju sa prirodom ovih interesantnih i zagon...