Consulta: subjectFacets:"Protozoa"
Registros recuperados: 32
Data/hora: 06/06/2024 13:55:28

Evaluación in vitro de subproductos agrícolas y plantas con capacidad desfaunante sobre la producción de metano.
Provedor de dados: 32
Autores: Portela Díaz, Diego Felipe.
Actualmente se necesitan alternativas que disminuyan la emisión de metano asociada a la producción ganadera, una opción, es el uso de plantas que contienen metabolitos secundarios y causan la desfaunación ruminal. El presente estudio tuvo como objetivo principal, evaluar la capacidad desfaunante in vitro de diferentes plantas y subproductos agrícolas, así como su efecto en algunas variables de fermentación ruminal, población de microorganismos, producción de dióxido de carbono  y metano. En la primera fase, se evaluaron 10 plantas y 6 subproductos agrícolas. El follaje del chicalote blanco (Argemone ochroleuca) y el subproducto, cascabillo de café (Coffea arabica) fueron seleccionados, ya que presentaron la mayor capacidad desfaunante. A la 96 h de...
Palavras-chave: Metano; Desfaunación; Protozoarios; Coffea arabica; Argemone ochroleuca; Methane; Defaunation; Protozoa; Ganadería; Maestría.
Ano: 2012
URL: http://hdl.handle.net/10521/1711

Estado de conocimiento de los tecamebianos dulceacuícolas de Chile
Provedor de dados: 72
Autores: Zapata Madrid,Jaime.
Las tecamebas son un grupo de protozoos que viven principalmente en las comunidades acuáticas y de ambientes húmedos (suelos, turberas, etc.), en donde juegan un importante rol como descomponedoras de celulosa y lignina; además participan activamente en diversos procesos biológicos que ocurren en los ecosistemas acuáticos. Con respecto al conocimiento de las tecamebas en Chile, éste se mantiene en un estado muy incipiente, de ahí la necesidad de contar con más especialistas, ya que este grupo está adquiriendo cada vez más importancia por su uso en problemas de paleolimnología, como bioindicadores de ambientes lacustres contaminados, como indicadores pedológicos, entre otros.
Tipo: Journal article
Palavras-chave: Protozoa; Tecamebas; Taxonomía; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100006

Определитель фауны Чёрного и Азовского морей: Свободноживущие беспозвоночные.Т.1.Простейшие, губки, кишечнополостные, черви, щупальцевые
Provedor de dados: 13
Autores: Мордухай-Болтовский, Ф. Д. (ред.).
Определитель обеспечивает возможность точного установления научного названия и систематического положения всех встречаемых в море организмов. Для каждой группы приводятся анатомо-морфологический обзор, определительные таблицы отрядов, семейств и родов с их краткими характеристиками и таблицы для определения видов. Рисунки приводятся для всех видов. Определитель выпущен в трех томах. В первый том включены простейшие, губки, кишечнополостные, черви, щупальцевые. Второй том охватывает всех свободноживущих представителей класса ракообразных, включая виды, населяющие опресненные солоноватоводные районы (с соленостью не менее 2-3%). Третий том посвящен группам свободноживущих беспозвоночных, не вошедшим в первые два тома, а именно: членистоногим (кроме...
Tipo: Book
Palavras-chave: Protozoa; Porifera; Coelenterata; Nemertini; Nemathelminthes; Annelida; Tentaculata; Oligochaeta; Hirudinea.
Ano: 1968
URL: http://repository.ibss.org.ua/dspace/handle/99011/1078

Ingestion of a bacterivorous ciliate by the oyster Crassostrea gigas: Protozoa as a trophic link between picoplankton and benthic suspension-feeders
Provedor de dados: 5
Autores: Le Gall, Solange; Bel Hassen, Malika; Le Gall, Pierre.
The linked concepts of 'microbial loop' and 'protozoan trophic link' have been very well documented in filter-feeding microzooplankton such as copepods, but have not been applied to energy transfer to benthic suspension-feeding macrofauna, with the exception of the recent demonstration of heterotrophic flagellate assimilation by mussels. The oyster Crassostrea gigas obtains energy resources by filtering microalgae (similar to 5 to 100 mu m). However, in turbid estuaries, light-limited phytoplanktonic production cannot entirely account for oyster energy requirements. Conversely, picoplankters (&lt;2 mu m), which are main effecters of coastal energy flow and matter cycling, are not efficiently retained by oyster filtration. Ciliate protozoal as both...
Tipo: Text
Palavras-chave: Oyster; Food sources; Picoplankton; Protozoa; Trophic link.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00337/44788/44482.pdf

Pigment dynamics associated with the grazing of a ciliate and a flagellate feeding on a cyanobacterium
Provedor de dados: 5
Autores: Mostajir, B; Bustillos-guzman, J; Claustre, H; Rassoulzadegan, F.
The egestion of particulate material as well as pigment degradation during microzooplankton grazing on phytoplankton are poorly known processes. In an attempt to evaluate these processes, changes in pigment concentrations within various size fractions were monitored in batch cultures of an assemblage of a pelagic ciliate (Strombidium sulcatum) and a heterotrophic flagellate (Paraphysomonas sp.) feeding on a cyanobacterium (Synechococcus sp.) over a 10-day period. Chlorophyll a, carotenoids and phaeopigments were not found in the 0.1-0.7 mu m fraction while the pigments originally in the 0.7-3.0 mu m fraction (prey) were transferred into the &gt; 3.0 mu m size fraction (predator). During this transfer, the carotenoids (zeaxanthin and B-carotene) were not...
Tipo: Text
Palavras-chave: Pigment; Phéopigment; Broutage; Protozoaire; HPLC; Pigment; Phaeopigment; Grazing; Protozoa; HPLC.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43660/43209.pdf

Mise au point d'outils moléculaires pour le diagnostic des parasites de type « Mikrocells » chez l'huître
Provedor de dados: 5
Autores: Kerdudou, Nolwenn.
Tipo: Text
Palavras-chave: Protozoa; Parasite identification; Ostrea edulis.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/rapport-1764.pdf

Response of the protozooplankton assemblage during the European Iron Fertilization Experiment (EIFEX) in the Antarctic circumpolar current
Provedor de dados: 5
Autores: Assmy, Philipp; Cisewski, Boris; Henjes, Joachim; Klaas, Christine; Montresor, Marina; Smetacek, Victor.
Ocean iron fertilization experiments enable the quantitative study of processes shaping the structure and functioning of pelagic ecosystems following perturbation under in situ conditions. EIFEX was conducted within a stationary eddy adjacent to the Antarctic Polar Front over 38 days in February/March 2004 and induced a massive diatom bloom. Here, we present the responses in abundance and biomass of all identifiable protozooplankton taxa (heterotrophic protists ranging from 2 to 500 mm) during the bloom. Acantharia, dinoflagellates and ciliates together contributed &gt;90% of protozooplankton biomass in the upper 100 m throughout the experiment with heterotrophic nanoflagellates, nassellaria, spumellaria, phaeodaria, foraminifera and the taxopodidean...
Tipo: Text
Palavras-chave: Protozoa; Rhizaria; Sarcodines; Southern Ocean; Top-down control.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00290/40091/39174.pdf

Diseases of cultured molluscs in Australia
Provedor de dados: 5
Autores: Lester, R.
Three mollusc species are cultured commercially in Australian tropical and warm temperate waters: the Sydney rock oyster Saccostrea commercialis , the pearl rock oyster is susceptible to two protozoans: Marteilia sydneyi , which is the cause of QX Disease and infects oysters during the summer; and Mikrocytos roughleyi which is associated with winter mortality. It also harbours mudworm, Polydora websteri a parasite farmers try to avoid by growing oysters on racks. Transported pearl oysters Pinctada maxima die with heavy infections of Vibrio harveyi . Cultured giant clams Tridacna gigas are pestered by pyramidellid snails and some carry Perkinsus sp., a protozoan common in reef bivalves. Deaths in mollusc hatcheries have been associated with Vibrio tubiashi...
Tipo: Text
Palavras-chave: Protozoa; Alteromonas; Vibrio tubiashi; Perkinsus; Vibrio harveyi; Polydora websteri; Mikrocytos roughleyi; Saccostrea commercialis; Pinctada maxima; Tridacna gigas; Bivalvia; Parasites; Mortality; Pearl culture; Infectious diseases; Parasitic diseases.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/acte-1468.pdf

Factors affecting bacterial biomass and growth in the Duplin River estuary and coastal Atlantic Ocean.
Provedor de dados: 5
Autores: Fallon, R; Newell, S; Sherr, B; Sheer, E.
Bacterial numbers and growth rates were measured in coastal, planktonic systems of the Western Atlantic ocean. Seasonal responses in growth rates of the bacterial assemblage were present at some sites, but these may be related to seasonal changes in substrate supply rather than to changes in temperature. Bacterial growth rates tended to decline with increasing distance from shore. There was evidence for predator-prey population cycles in the bacteria and &lt; 17 mu m protozoa in the Duplin River Estuary which may indicate that the bacterial assemblage serves as prey for protozoan populations. In summer, a significant negative correlation between mu (instantaneous growth rate) and cell numbers in the bacterial assemblage indicated that substrate limitation...
Tipo: Text
Palavras-chave: Protozoa; Plankton; Bacteria; Predators; Grazing; Temperature effects; Seasonal variations; Limiting factors; Interspecific relationships; Nutrients (mineral); Growth.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-955.pdf

Release of dissolved amino acids by flagellates and ciliates grazing on bacteria
Provedor de dados: 5
Autores: Ferrier-pages, C; Karner, M; Rassoulzadegan, F.
Release of amino acids was examined in the laboratory in the form of dissolved primary amine (DPA) by two marine planktonic protozoa (the oligotrichous ciliate, Strombidium sulcatum and the aplastidic flagellate Pseudobodo sp.) grazing on bacteria. DPA release rates were high (19-25 x 10(-6) and 1.8-2.3 x 10(-6) mu mol DPA cell(-1) h(-1) for flagellates and ciliates, respectively) during the exponential phase, when the ingestion rates were maximum. Release rates were lower during the other growth phases. The release of DPA accounted for 10 % (flagellates) and 16 % (ciliates) of the total nitrogen ingested. Our data suggest that the release of DPA by protozoa could play an important role in supporting bacterial and consequently autotrophic pico- and...
Tipo: Text
Palavras-chave: Acides aminés; Protozoaires; Taux d'excrétion; Matière organique dissoute; Amino acids; Protozoa; Excretion rates; Dissolved organic matter.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00326/43670/43200.pdf

Flow cytometry characterisation of defense cellular mechanisms  from flat oyster, Ostrea edulis, parasited with Bonamia ostreae
Provedor de dados: 5
Autores: Garcia, Sandrine.
Tipo: Text
Palavras-chave: Cytometry; Disease resistance; Protozoa; Ostrea edulis.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/rapport-1925.pdf

Intestinal parasites of Alouatta caraya (Primates, Ceboidea): preliminary study in semi-captivity and in the wild in Argentina
Provedor de dados: 81
Autores: Milozzi,Carola; Bruno,Gabriela; Cundom,Elisa; Mudry,Marta D; Navone,Graciela T.
Endoparasitic infections are common in nonhuman primates and important factors in regulating their natural populations. Primates are particularly vulnerable to the infections of directly transmitted parasites because they often live in close social groups that facilitate their transmission. The main objective of this study was to provide baseline data on gastrointestinal parasites of semi captive and wild howler monkeys Alouatta caraya troops from Argentina. We collected 110 fecal samples from 38 howler monkeys from four troops, two of them kept in semi-captivity at the CRMAN, Córdoba, and two wild troops from Las Lomas, Corrientes. We identified six species of parasites: four Protozoa, Giardia lamblia, Blastocystis hominis, Eimeria sp. and Entamoeba coli;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alouatta caraya; Argentina; Helminths; Protozoa.
Ano: 2012
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832012000200006

The valid name for the genus Loxocephalus Foerster, 1862 (Insecta, Hymenoptera: Braconidae), preoccupied by Loxocephalus Eberhard, 1862 (Protozoa: Ciliophora)
Provedor de dados: 16
Autores: Foissner, W.; Achterberg, C. van.
Loxocephalus Foerster, 1862 (Insecta: Braconidae) is preoccupied by Loxocephalus Eberhard, 1862 (Protozoa: Ciliophora). The name previously used for Loxocephalus Foerster, Myiocephalus Marshall, 1897, becomes the valid name for the genus.
Tipo: Article / Letter to the editor
Palavras-chave: Hymenoptera; Braconidae; Euphorinae; Protozoa; Ciliophora; Loxocephalus; Palaearctic; Homonymy; 42.75.
Ano: 1997
URL: http://www.repository.naturalis.nl/record/318952

Trypanosomatid prevalence in Nezara viridula (L.), Euschistus heros (Fabricius) and Piezodorus guildinii (Westwood) (Heteroptera: Pentatomidae) populations in Northern Paraná, Brazil
Provedor de dados: 82
Autores: Sosa-Gómez,Daniel R.; Borges,Ednéia; Viera,Ivan H.T.L.; Costa,Fernando; Oliveira,Caroline N.
The stink bug complex in soybeans has a great potential to cause damage, their control has been difficult due to high population densities at the end of the season. Studies related to entomopathogenic organisms in stink bugs are interesting for their possibilities to be used as biological control agents and because they could be an etiological agent in mass rearing. We determined the prevalence of trypanosomatids in the most important species of the stink bug complex in soybean, from Brazil, Nezara viridula (L.), Euschistus heros (Fabricius) and Piezodorus guildinii (Westwood). Insects were collected in soybean and on alternate hosts during the intercrop season. Hemolymph drops from each adult were mounted on slides and observed under microscope; stink bug...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insect; Stink bug; Protozoa; Flagellate.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2005000200025

Expression of 65 000 MW Heat-shock Protein in SCID Mice Infected with Toxoplasma gondii after Transplantation of Mouse Fetal Thymus
Provedor de dados: 19
Autores: Nagasawa, Hideyuki; Hisaeda, Hajime; Ishikawa, Hiroyuki; Maekawa, Yoichi; Sakai, Tohru; Himeno, Kunisuke; 長澤, 秀行.
Palavras-chave: Heat shock protein; HSP65; Toxoplasma gondii; Protozoa; SCID mice; Protective immunity.
Ano: 1995
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/229

The Role of Carbohydrates in Infection Strategies of Enteric Pathogens
Provedor de dados: 19
Autores: Kato, Kentaro; Ishiwa, Akiko; 加藤, 健太郎.
Enteric pathogens cause considerable public health concerns worldwide including tropical regions. Here, we review the roles of carbohydrates in the infection strategies of various enteric pathogens including viruses, bacteria and protozoa, which infect the epithelial lining of the human and animal intestine. At host cell entry, enteric viruses, including norovirus, recognize mainly histo-blood group antigens. At the initial step of bacterial infections, carbohydrates also function as receptors for attachment. Here, we describe the function of carbohydrates in infection by Salmonella enterica and several bacterial species that produce a variety of fimbrial adhesions. During invasion by enteropathogenic protozoa, apicomplexan parasites utilize sialic acids...
Palavras-chave: Bacteria; Carbohydrate; Enteric pathogen; Infection; Protozoa; Virus.
Ano: 2015
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4299

Inhibitory effects of Melia azedarach L. extracts on the growth of Trichomonas vaginalis : Ultrastructural changes of Trichomonas vaginalis treated by Melia azedarach L
Provedor de dados: 19
Autores: Lee, Yun Sik; Chung, In Bai; Choi, Won Hyung; Cho, Yoo Jung; Chu, Jong Phil; Min, Byung-Il; Shin, Eun-Hee.
Meliae cortex (Melia azedarach Linne. var. japonica Makino, M. toosendan Siebold &amp; Zucc) is one of the herbs used in oriental medicine for the treatment of various types of vaginitis. The present study was performed to examine the effects of Meliae cortex extracts on the growth and fine structure of Trichomonas vaginalis (T. vaginalis). Meliae cortex dose-dependently reduced the viability of T. vaginalis. In the electron microscopy study, we also observed the ultrastructural changes of T. vaginalis following the treatment with Meliae cortex. One to two hours after the addition of the extract of Meliae cortex, the movement of flagella and axostyle decreased, but the cell death did not occur. The fine structure of the cytoplasm was changed 30 min to 2...
Palavras-chave: Trichomonas vaginalis; Meliae cortex; Meliae azedarach; Inhibition of cell multiplication; Protozoa; Ultra structure.
Ano: 2007
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1051

Effects of Euglena (Euglena gracilis) supplemented to diet (forage: concentrate ratios of 60:40) on the basic ruminal fermentation and methane emissions in in vitro condition
Provedor de dados: 19
Autores: Aemiro, Ashagrie; Watanabe, Shota; Suzuki, Kengo; Hanada, Masaaki; Umetsu, Kazutaka.
An in vitro study was conducted to investigate the effect of different concentrations of Euglena (Euglena gracilis) on CH4 production, dry matter (DM) digestibility, volatile fatty acid (VFA) and ammonia N(NH3-N) concentration as well as on the protozoa population. The treatments considered were Euglena at concentrations of 0.0, 50, 100, 200, 400 and 1000 g/kg dry matter (DM) of the substrate (60:40 forage: concentrate ratio) incubated for 24 and 96 h using an in vitro continuous gas production and in vitro two-stage digestion procedure, respectively. The data were subjected to polynomial regression analysis. Methane emissions (ml/g DM) decreased at an increasing rate, generally with increasing concentration of Euglena but also exhibited quadratic (P&lt;...
Palavras-chave: Methane emission; Euglena; Protozoa; Volatile fatty acid; Digestibility; Ammonia.
Ano: 2016
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4458

Protozoa as test organisms in marine ecotoxicology: luxury or necessity?
Provedor de dados: 27
Autores: Dive, D.; Persoone, G.
A critical examination of the utility of protozoan bioassays in marine as well as in freshwater ecotoxicology implies the answer to three basic questions: why, how and when. Arguments in favor of tests with Protozoa are: protozoans combine all biological mechanisms and functions in one single cell; the physiology and biochemistry of several species has been studied extensively; the generation time of Protozoa is very short in comparison to Metazoa; large numbers of organisms can be produced in a small volume; induction of cryptobiotic stages is possible with some species; Protozoa play a significant role in aquatic ecosystems; test methodologies with very sensitive criteria can be worked out. The two basic approaches for bioassay are &lt;i&gt;in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecotoxicology; Test organisms; Protozoa.
Ano: 1984
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3264

Bacteria and protozoa populations in groundwater in landfill area in São Carlos, SP
Provedor de dados: 59
Autores: Fusconi,Roberta; Godinho,Mirna Januária Leal.
The microbial populations of groundwaters were analyzed in a region under the influence of a landfill (piezometer L12) in the town of São Carlos, São Paulo, Brazil, and in an area not influenced by the landfill (piezometer L5). Heterotrophic bacteria were counted by spread plate method and the number of protozoa was estimated by the most probable number method. There was a larger number of organisms in well L12, with a mean value of 15.76 x 104 CFU/ml for bacteria and 9.7 MPN/ml for protozoa, whereas the mean values for piezometer L5 were 2.88 x 104 CFU/ml for bacteria and 3.4 MPN/ml for protozoa. The greater abundance detected in piezometer L12 may be related to the influence of the leachate through the landfill on the microbial populations, also...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacteria; Protozoa; Groundwater; Landfill.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141999000300003

Efectos del parasitismo sobre el tejido branquial en peces cultivados: estudio parasitologico e histopatologico
Provedor de dados: 104
Autores: Martins,Maurício Laterça; Romero,Nicolás Garcia.
One hundred four out of 225 diagnosticated cases were myxosporidian, monogenean, Ichthyophthirius multifiliis Fouquet, 1876 and bacterial diseases in Piaractus mesopotamicus Holmberg, 1887 (pacu), Colossoma macropomum Cuvier, 1818 (tambaqui) and tambacu, at Aquaculture Center, Universidade Estadual Paulista (UNESP), Jaboticabal, São Paulo, Brazil, between 1992 and 1995. The gills were fixed in 10% buffered formalin solution to posterior histologic routine. It was observed Henneguya sp. cysts into the capillaries of the secondary lamellae, encapsulated by the respiratory epithelium cells. It provoked adherence of the adjacent lamellae, hyperplasia, congestion, oedema and epithelium displacement. Monogeneans infestations by Anacanthorus penilabiatus Boeger,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Protozoa; Monogenea; Histopathology; Brazilian fish.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751996000200017

Flagellate protist abundance in phytotelmata of Aechmea distichantha Lem. (Bromeliaceae) in the upper Paraná river basin - doi: 10.4025/actascibiolsci.v35i4.17134
Provedor de dados: 3
Autores: Duarte, Gisele Silva Costa; Alves, Geziele Mucio; Lansac-Tôha, Fernando Miranda; Velho, Luiz Felipe Machado; Lansac-Tôha, Fábio Amodêo.
In some Bromeliaceae species the leaf sheaths form a tank or phytotelma, accumulating water and organic detritus, conditions that allow the establishment of different communities. Thus, this study evaluated the relationship between diameter and volume of water in the tank of the bromeliad Aechmea distichantha Lem. and density of flagellates found in the phytotelmata, as well as the influence of the hydrological periods and proximity of sampled strata on the phytotelma patterns of abundance distribution. Samplings were conducted in two hydrological periods in 2010. In each sampling, four plants were collected from three different strata, classified according to the distance from the river level. A one-way ANOVA identified significant differences in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecologia/Ecologia de Ecossistemas Phytotelma; Protozoa; Bromeliad; Rocky walls Ecologia de Protoplâncton.
Ano: 2013
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/17134

Species richness of testate amoebae in different environments from the upper Paraná river floodplain (PR/MS) - doi: 10.4025/actascibiolsci.v33i3.7261
Provedor de dados: 3
Autores: Costa, Deise de Morais; Universidade Estadual de Maringá; Alves, Geziele Mucio; UEM; Velho, Luiz Felipe Machado; UEM; Lansac-Tôha, Fábio Amodêo; UEM.
This study evaluated the species richness of testate amoebae in the plankton from different environments of the upper Paraná river floodplain. Samplings were performed at subsurface of pelagic region from twelve environments using motorized pump and plankton net (68 &amp;micro;m), during four hydrological periods. We identified 67 taxa, distributed in seven families and Arcellidae, Difflugiidae and Centropyxidae were the most representative families. Higher values of species richness were observed in the lakes (connected and isolated) during the flood pulses. Centropyxis aculeata, Difflugia gramem and D. pseudogramem were frequent throughout the study period. Seasonal variability of species in the channels and isolated lakes was evidenced by beta...
Palavras-chave: Protozoa; Plankton; Diversity; Species composition Protozoa; Plankton; Diversity; Species composition.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/7261

Seasonal distribution of nanoflagellates and bacterioplankton and relationship with environmental factors in a brazilian semi-arid reservoir - doi: 10.4025/actascibiolsci.v34i4.10832
Provedor de dados: 3
Autores: Amorim, Aline de Souza; Universidade Federal do Rio Grande do Norte; Araújo, Magnólia Fernandes Florêncio de; Universidade Federal do Rio Grande do Norte.
The semi-arid region of Rio Grande do Norte State, in northeast Brazil exhibits specific physical-climatic aspects: the climate is very hot, with mean annual rainfall of 550 mm, characterized by periodic drought and uneven distribution of rains. Due to these features, is important to study and preserve its water bodies. The purpose of this paper was to characterize and investigate bacterioplankton and heterotrophic nanoflagellates, and their seasonal variations in a reservoir located in the semi-arid region of Rio Grande do Norte State, in 2008. To this aim, four samplings were carried out in the rainy season and three in the dry season to determine the biotic and abiotic variables. Bacterial densities in the reservoirs ranged from 8.98 x 106 to 1.62 x 107...
Tipo: Estudo ecológico
Palavras-chave: 2.00.00.00-6 microorganisms; Dam; Protozoa; Abiotic variables 2.12.00.00-9.
Ano: 2012
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/10832

Study of testacean assemblages (Protozoa: Rhizopoda) in touristic waterfall regions of Chapada dos Guimarães National Park, Mato Grosso State, Brazil - doi: 10.4025/actascibiolsci.v32i4.7456
Provedor de dados: 3
Autores: Oliveira, Márcia Teixeira de; Universidade Federal de Mato Groo; Hardoim, Edna Lopes; Universidade Federal do Mato Grosso.
An evaluation was made of the effect of temporal variations on an assembly of Testaceae in several water bodies located in Chapada dos Guimarães National Park. A sampling point was selected at each study site, where 4 samplings were collected per season, considering the climatic conditions of the dry and rainy periods. The findings revealed 80 infrageneric taxa, 05 families and 12 genera. Pearson’s correlation between the second axis of the DCA and the first axis of the PCA was significant, even after applying Bonferroni’s correction for multiple significance tests (r = 0.683; p = 0.014). Thus, the temporal variation of the limnological data, which showed higher values of turbidity, total solids, color and temperature for the rainy period and higher...
Palavras-chave: Testacean; Protozoa; Rhizopoda; Waterfall regions Testacean; Protozoa; Rhizopoda; Waterfall regions.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/7456

Presence of parasitic structures in lettuces served in self-service restaurants of São Miguel do Oeste, Santa Catarina State, Brazil
Provedor de dados: 3
Autores: Vidigal, Tiago Mateus Andrade; Landivar, Elaine Eloiza Cortellini.
Consuming raw food like lettuce may carry protozoa cysts and helminth eggs, causing parasitic infections. Therefore, the parasitological analysis of this type of food it’s important for public health because it provides data on the hygiene conditions in which these vegetables were produced, transported, processed and handled until the ingestion. This study aimed to evaluate the occurrence of parasitic structures in samples of lettuce (Lactuca sativa) sold in self-service restaurants in São Miguel do Oeste, Santa Catarina State, Brazil. The samples were randomly collected in 20 locations in duplicate, prepared according to the method of Hoffman, Pons, and Janer (1934) and analyzed with an optical light microscopy. The parasitic structures found were Cysts...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Protozoa; Helminths; Contamination; Food; Vegetables.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/35027

Planktonic heterotrophic nanoflagellate abundance along a trophic gradient in subtropical reservoirs: influence of a bottom-up or top-down control mechanism
Provedor de dados: 3
Autores: Pereira, Danielle Goeldner; Universidade Estadual de Maringá; Rodrigues, Luzia Cleide; Universidade Estadual de Maringá; Lansac-Tôha, Fábio Amodêo; Universidade Estadual de Maringá; Velho, Luiz Felipe Machado; Universidade Estadual de Maringá.
The aim of the current study was to assess the variability in heterotrophic nanoflagellate abundance attributable to variables responsible for the influence of bottom-up and top-down control mechanisms in the plankton food web along a trophic gradient in subtropical reservoirs (Paraná State,Brazil). In particular, we hypothesised that food resources were the main determinant for the abundance of heterotrophic nanoflagellates (HNF) along a trophic gradient. Results showed that HNF communities were weakly influenced by the bottom-up mechanism. Moreover, there was evidence of a slight influence from a top-down control mechanism on this community. Therefore, the results of the present study did not corroborate the hypothesis initially proposed, and further...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 2.00.00.00-6 plankton; Protozoa; Food resource availability; Cascading effect; Freshwater environments Ecologia.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/19084

Relationship between testicular lesion and hormone levels in male rats infected with Trypanosoma evansi
Provedor de dados: 42
Autores: FACCIO,LUCIANA; SILVA,ALEKSANDRO S. DA; TONIN,ALEXANDRE A.; OBERHERR,LUCAS; GRESSLER,LUCAS T.; OLIVEIRA,CAMILA B.; OLIVEIRA,DIONATAN T.; SANGOI,MANUELA B.; MORESCO,RAFAEL N.; SAMARA,YASMIN N.; VEIGA,MARCELO; DUARTE,MARTA M.M.F.; MONTEIRO,SILVIA G.
The aim of this study was to evaluate the relationship between testicular lesions and hormone levels in rats experimentally infected with Trypanosoma evansi. For that, the measurement of reproductive hormones, histopathology and biomarkers of cellular injury were carried out in twenty-four animals, which were divided into two groups with 12 animals each. Group A was the negative control, or uninfected, while group B was composed by animals infected with T. evansi. Both groups were divided again into two other subgroups (n=6), from which serum and testicular fragments were collected on days 5 (A1 and B1) and 15 (A2 and B2) post-infection (PI). The morphological analysis showed increased alterations of head and tail of sperm in infected rats when compared...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Protozoa; Wistar rats; Testicular lesion; Reproduction; Oxidative stress.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301537

Quantification of ruminal microbiota and production of methane and carbonic dioxide from diets with inclusion of glycerin
Provedor de dados: 45
Autores: Santos,V.C.; Ezequiel,J.M.B.; Homem Junior,A.C.; Pinheiro,R.S.B.
The aim of this study was to quantify the liquid-associated bacteria and protozoa of the rumen and to evaluate the potential of in vitroproduction of gases CH4 and CO2 of diets with inclusion of glycerin for sheep. Two diets were formulated with a roughage:concentrate ratio of 20:80, according to the presence or absence of glycerin: G0 - control, without glycerin; and G10 - 10% glycerin as part of the concentrate. To quantify the liquid-associated bacteria and protozoa from the rumen and production of CH4 and CO2 gases, a completely randomized design was used. The diets had no effect (P&gt;0.05) on production and composition of liquid-associated protozoa and bacteria from the rumen of lambs. Likewise, a (P&gt;0.05) diet effect was not observed on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sheep; Bacteria; Gases; Nitrogen; Protozoa.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352015000100205

First report of Epibiont ciliates (Ciliophora: Peritrichia) living on larvae of Leptophlebiidae (Ephemeroptera) from Brazil
Provedor de dados: 52
Autores: Abrahão,Daniel Peroni; Mello,José Leonardo; Gorni,Guilherme; Corbi,Juliano José.
ABSTRACT Epibiosis was understood as a commensalism relation between two or more organisms. However, some studies have shown that epibionts can cause deleterious effects to their host. Here, we reported the first report of epibiosis between protozoa Epibiont ciliates (Ciliophora: Peritrichia) living on larvae of Ephemeroptera from Brazil.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epibiosis; Protozoa; Ephemeroptera.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100401

Ocorrência de protozoários e helmintos em amostras de fezes de cães e gatos da cidade de São Paulo
Provedor de dados: 62
Autores: GENNARI,Solange Maria; KASAI,Nobuko; PENA,Hilda Fátima de Jesus; CORTEZ,Adriana.
Foram examinadas, pelo Laboratório de Doenças Parasitárias do Departamento de Medicina Veterinária Preventiva e Saúde Animal, da Faculdade de Medicina Veterinária e Zootecnia da Universidade de São Paulo, no período de janeiro de 1991 a janeiro de 1995, amostras de 353 cães e de 187 gatos, com idades variadas e de diferentes áreas da cidade de São Paulo. Os métodos de diagnóstico empregados foram: centrífugo-flutuação em solução de sacarose e centrífugo-sedimentação em água-éter. Aproximadamente 45,0% das amostras de cães examinadas (160 amostras) apresentaram-se positivas e o percentual de ocorrência de parasitos, em relação ao total de amostras foi: Ancylostoma spp. 20,40; Toxocara canis 8,49; Giardia sp. 7,65; Cryptosporidium parvum 2,83; Cystoisospora...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cães; Gatos; Helmintos; Protozoa.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95961999000200006

Involvement of nitric oxide and its up/down stream molecules in the immunity against parasitic infections
Provedor de dados: 55
Autores: Nahrevanian,Hossein.
Nitric oxide (NO) is a potent mediator with diverse roles in regulating cellular functions and signaling pathways. The NO synthase (NOS) enzyme family consists of three major isoforms, which convey variety of messages between cells, including signals for vasorelaxation, neurotransmission and cytotoxicity. This family of enzymes are generally classified as neuronal NOS (nNOS), endothelial NOS (eNOS) and inducible NOS (iNOS). Increased levels of NO are induced from iNOS during infection; while eNOS and nNOS may be produced at the baseline in normal conditions. An association of some key cytokines appears to be essential for NOS gene regulation in the immunity of infections. Accumulating evidence indicates that parasitic diseases are commonly associated with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: INOS; Nitric oxide; NO; Immunity; Helminth; Parasite; Protozoa.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702009000600010