173,081 Works

The Transition from Ratios to Trigonometric Functions

Maria Elisa Esteves Lopes Galvão, Vera Helena Giusti De Souza & Paulo Masanobo Miashiro
Abstract Our motivation comes from the difficulties that appeared in the lessons involving trigonometric functions, related to the trigonometric circle and the measure of an angle in radians. The aim was to investigate the contributions of an approach combining constructions with a dynamic software and concrete material. Based on the Meaningful Learning Theory, we chose subsumed concepts related to the definition of the sinus function and applied a set of activities for nine students from...

Translating Thinking and Statistical Literacy Activities for the Classroom: building an educational product

Mario De Souza Santana
Abstract This study presents the construction of an educational product for teaching and learning of Statistics through discussion of the theoretical foundations that substantiate statistics. It also aims to show notes, which can set up guidelines regarding the conduction of activities by the teacher with a view to greater efficiency when using such didactic and methodological proposition. Such matters comes from a previous literature review and perceptions that emerged during its implementation in a High...

How unusual a Mathematics class can be? Learning processes and mistakes

Sônia Maria Clareto & Aline Aparecida Da Silva
Abstract A mathematics class in a public school: a usual school, a usual classroom. Everything flows as normal. However, an accurate attention to a small and trivial situation may constitute a watchful eye to simplicities in this mathematics class. As the homework was corrected, a student has doubts, the teacher explains… How consequent is this episode? In this quiet mathematics class a “mistake” is opened as production. A plot like a mathematics class, with the...

The Babylon of switchable identity games: contradiction of voices, shatter of faces

Tatiana Prevedello
Abstract: The novel Didn't see you in Babylon yesterday, by António Lobo Antunes, to propose a question about the nature of identity representation of characters invites the reader to reflect about the activity of textual creation. In this context, while the otherness of fictional individuals are in a simultaneous process of affirmation and negation, in which the “I” is in constant tension between the “other” or “non-self", the narrative voice is also presented as a...

Advances and challenges in oral health after a decade of the “Smiling Brazil” Program

Charleni Inês Scherer & Magda Duarte Dos Anjos Scherer
ABSTRACT OBJECTIVE To analyze oral health work changes in primary health care after Brazil’s National Oral Health Policy Guidelines were released. METHODS A literature review was conducted on Medline, LILACS, Embase, SciELO, Biblioteca Virtual em Saúde, and The Cochrane Library databases, from 2000 to 2013, on elements to analyze work changes. The descriptors used included: primary health care, family health care, work, health care policy, oral health care services, dentistry, oral health, and Brazil. Thirty-two...

Serosurvey for Leishmania spp., Toxoplasma gondii, Trypanosoma cruzi and Neospora caninum in neighborhood dogs in Curitiba-Paraná, Brazil

Caroline Constantino, Maysa Pellizzaro, Edson Ferraz Evaristo De Paula, Thállitha Samih Wischral Jayme Vieira, Ana Pérola Drulla Brandão, Fernando Ferreira, Rafael Felipe Da Costa Vieira, Helio Langoni & Alexander Welker Biondo
Abstract Neighborhood dogs may act as reservoirs for several zoonotic protozoan infections, particularly in urban areas, thus constituting a potential public health threat. Accordingly, the aim of the present study was to evaluate the exposure of neighborhood dogs to four protozoan pathogens in public areas with high levels of human movement in Curitiba, southern Brazil. Blood samples from 26 neighborhood dogs were screened by means of the indirect immunofluorescent antibody test (IFAT) for Leishmania spp.,...

Occurrence of Neospora caninum and Toxoplasma gondii antibodies in dogs from rural properties surrounding a biological reserve, Espirito Santo, Brasil

Igor Da Cunha Lima Acosta, Luana D’Avila Centoducatte, Herbert Sousa Soares, Arlei Marcili, Maria Fernanda Naegeli Gondim, João Luiz Rossi Junior & Solange Maria Gennari
Abstract The aim of this study was to determine the presence of antibodies to Neospora caninum and Toxoplasma gondii in serum samples of 187 dogs from 30 rural properties surrounding Córrego do Veado Biological Reserve, Espírito Santo State, Brazil. The Reserve is one of the last lowland Atlantic Forest remnants of the region, surrounded by agriculture farms and cattle pastures. The presence of IgG antibodies was determined by the Indirect Fluorescent Antibody Test for T....

Seroprevalence of Toxoplasma gondii in dogs of riverside communities of Mato Grosso Pantanal, Brazil

Juliana Yuki Rodrigues, Arleana Do Bom Parto Ferreira De Almeida, Eveline Da Cruz Boa Sorte, Naiani Domingos Gasparetto, Felipe Augusto Constantino Seabra Da Cruz & Valéria Régia Franco Sousa
Abstract Toxoplasma gondii is an intracellular protozoan with worldwide distribution and dogs act as sentinels of human infection. This search aimed to determine the occurrence of antibodies against T. gondii in dogs of the communities on the Cuiabá River, Mato Grosso and variables associated with infection. The dogs of the riverside communities in Cuiabá River, which includes Barranco Alto, Praia do Poço, Engenho Velho, Varginha, Bom Sucesso, Passagem da Conceição and São Gonçalo Beira Rio,...

Hematological changes associated with hemoplasma infection in cats in Rio de Janeiro, Brazil

Juliana Macedo Raimundo, Andresa Guimarães, Raisa Braul Rodrigues, Camila Flávia Magalhães Botelho, Maristela Peckel Peixoto, Marcus Sandes Pires, Carlos Henrique Machado, Huarrisson Azevedo Santos, Carlos Luiz Massard, Marcos Rogério André, Rosangela Zacarias Machado & Cristiane Divan Baldani
Abstract This study aimed to detect Mycoplasma spp. in naturally infected cats from Rio de Janeiro and to evaluate hematological abnormalities and factors associated with this infection. Out of the 197 cats sampled, 11.2% presented structures compatible with hemoplasma organisms on blood smears. In contrast, 22.8% were positive for Mycoplasma spp. by means of 16S rRNA gene real-time polymerase chain reaction, which reflects the weak concordance between techniques. The infection rates, by means of 16S...

Interference periods of velvet bean in sugarcane

Fernanda Nunes Bressanin, Nelson Jayme Neto, Mariluce Pascoalina Nepomuceno, Pedro Luís Da Costa Aguiar Alves & Willians César Carrega
ABSTRACT: The objective of the present study was to determine the periods of interference of velvet bean on ratoons of sugarcane cultivar 'RB855536' and to identify its potential for decreasing the crop yield and the quality of the harvested product. The experiment was arranged in a randomized block design, with 18 treatments divided into two groups and four replicates per treatment. In the first group, the sugarcane was kept free from velvet bean interference for...

Molecular detection of Anaplasma species in dogs in Colombia

Giovanni Vargas-Hernandez, Marcos Rogério André, Diana Maria Cendales, Keyla Carstens Marques De Sousa, Luiz Ricardo Gonçalves, Mariana Cristina Hoeppner Rondelli, Rosangela Zacarias Machado & Mirela Tinucci-Costa
Abstract Anaplasma platys and A. phagocytophilum are tick-borne pathogens that parasitize platelets and neutrophils, respectively, of humans and animals. The former is the etiological agent of canine cyclic thrombocytopenia, while the latter is that of canine granulocytic anaplasmosis. This work involved the detection and identification of Anaplasma species in blood samples from dogs in Colombia, using molecular techniques. Between December 2008 and April 2009, blood samples were drawn from the cephalic vein of 91 dogs...

Hepatozoon canis and Leishmania spp. coinfection in dogs diagnosed with visceral leishmaniasis

Fernanda Nazaré Morgado, Amanda Dos Santos Cavalcanti, Luisa Helena De Miranda, Lúcia Helena O’Dwyer, Maria Regina Lucas Da Silva, Rodrigo Caldas Menezes, Aurea Virgínia Andrade Da Silva, Mariana Côrtes Boité, Elisa Cupolillo & Renato Porrozzi
Abstract This study describes the occurrence of dogs naturally co-infected with Hepatozoon canis and two Leishmania species: L. infantum or L. braziliensis. Four dogs serologically diagnosed with Visceral Leishmaniasis were euthanized. Liver and spleen samples were collected for histopathological analysis and DNA isolation. H. canis meronts were observed in tissues from all four dogs. H. canis infection was confirmed by PCR followed by sequencing of a fragment of 18S rRNA gene. Leishmania detection and typing...

Infection with Toxoplasma gondii in a red kangaroo (Macropus rufus) and a Patagonian mara (Dolichotis patagonum) in captivity

Nataly Díaz-Ayala, Ezequiel Hidalgo-Hermoso, Constanza Cabello-Araya & Francisco Carvallo-Chaigneau
Abstract Toxoplasmosis is an infectious, zoonotic and parasitic disease, caused by Toxoplasma gondii. In this manucript, two cases of infection with T. gondii in captive animals from a zoological park in the central region of Chile are described. One case was a red kangaroo (Macropus rufus), which is highly susceptible to the infection, and the other was a Patagonian mara (Dolichotis patagonum), a rodent in which there is no previous report of the infection. Both...

Does hair coat length affect flea infestation in naturally infested dogs?

Guilherme Araujo Collares Da Silva, Luciana Araujo Lins, Márcio Josué Costa Irala, Marcial Corrêa Cárcamo & Paulo Bretanha Ribeiro
Abstract The Siphonaptera are parasitic insects of endothermic animals and Ctenocephalides felis and Pulex irritans are important parasites of dogs. This study evaluated the effect of hair coat length and time of year on the population size of C. felis and P. irritans in naturally infested dogs. Fleas were collected from 14 dogs on a monthly basis for a year (February 2015 to January 2016) at a rural property in Bagé, Rio Grande do Sul,...

Probability of occurrence of the Brazilian spotted fever in northeast of Paraná state, Brazil

Flávio Haragushiku Otomura, Jessé Henrique Truppel, Jonas Moraes Filho, Marcelo Bahia Labruna, Diogo Francisco Rossoni, Rubens Massafera, Vanete Thomaz Soccol & Ueslei Teodoro
Abstract Brazilian spotted fever (BSF) is a fatal zoonosis because of the difficulties in its early diagnosis and treatment. Occurrences of BSF in the northeast of the state of Paraná prompted investigation of areas at risk of this rickettsiosis in the municipalities of Japira, Jaboti, Pinhalão and Tomazina. To determine the areas at risk, 592 serum samples from dogs and 230 from equids were analyzed by means of the indirect immunofluorescence assay (IFA) for Rickettsia...

Natural canine infection by Leishmania infantum and Leishmania amazonensis and their implications for disease control

Letícia Da Cruz Sanches, Cleber Costa De Martini, Alex Akira Nakamura, Maria Emília Bodini Santiago, Beatriz Dolabela De Lima & Valéria Marçal Felix De Lima
Abstract Leishmaniasis is a major public health problem worldwide. Because Leishmania can adapt to new hosts or vectors, knowledge concerning the current etiological agent in dogs is important in endemic areas. This study aimed to identify the Leishmania species detected in 103 samples of peripheral blood from dogs that were naturally infected with these protozoa. The diagnosis of leishmaniasis was determined through parasitological examination, the indirect enzyme-linked immunosorbent assay (ELISA) and the polymerase chain reaction...

Assessment of transplacental transmission of Neospora caninum in dairy cattle in the Agreste region of Pernambuco

Inalda Angélica De Souza Ramos, Rafael José Da Silva, Thiago Arcoverde Maciel, José Augusto Bastos Afonso Da Silva, Otavio Luiz Fidelis Junior, Pierre Castro Soares, Rosangela Zacarias Machado, Marcos Rogério André & Carla Lopes De Mendonça
Abstract The transplacental transmission is the primary route of Neospora caninum infection in bovine herds around the world. This study aimed to determine the frequency of transplacental transmission of the parasite in dairy cattle of Agreste region of Pernambuco through serological tests (IFAT and ELISA). Three hundred sixteen serum samples from cows and heifers and their offspring were analyzed. The transplacental transmission rate was 72.22% (13/18) for cows and 69.23% (9/13) for heifers by IFAT....

Risk factors for Toxoplasma gondii infection in sheep and cattle from Fernando de Noronha Island, Brazil

Fernando Jorge Rodrigues Magalhães, Müller Ribeiro-Andrade, Adrianne Mota De Alcântara, José Wilton Pinheiro Júnior, Maria José De Sena, Wagnner José Nascimento Porto, Rafael Felipe Da Costa Vieira & Rinaldo Aparecido Mota
Abstract Toxoplasmosis is a zoonotic disease of global distribution that affects all warm-blooded animals. The purpose of this investigation was to determine the prevalence of T. gondii infection and identify the risk factors associated with its occurrence in domestic ruminants raised on the island of Fernando de Noronha, Brazil, and to confirm that cattle and sheep raised in Fernando de Noronha Island present statistically different T. gondii prevalence rates. Serum samples were collected from sheep...

Piper aduncum against Haemonchus contortus isolates: cross resistance and the research of natural bioactive compounds

Yousmel Alemán Gaínza, Rafaela Regina Fantatto, Francisco Celio Maia Chaves, Humberto Ribeiro Bizzo, Sérgio Novita Esteves & Ana Carolina De Souza Chagas
Abstract The anthelminthic activity of the essential oil (EO) of Piper aduncum L. was tested in vitro on eggs and larvae of resistant (Embrapa2010) and susceptible (McMaster) isolates of Haemonchus contortus. The EO was obtained by steam distillation and its components identified by chromatography. EO concentrations of 12.5 to 0.02 mg/mL were used in the egg hatch test (EHT) and concentrations of 3.12 to 0.01 mg/mL in the larval development test (LDT). Inhibition concentrations (IC)...

New morphological data of Litomosoides chagasfilhoi (Nematoda: Filarioidea) parasitizing Nectomys squamipes in Rio de Janeiro, Brazil

Luís Cláudio Muniz-Pereira, Paula Araujo Gonçalves, Erick Vaz Guimarães, Fábio De Oliveira Fonseca, José Augusto Albuquerque Dos Santos, Arnaldo Maldonado-Júnior & Antonio Henrique Almeida De Moraes Neto
Abstract Litomosoides chagasfilhoi, originally described by Moraes Neto, Lanfredi & De Souza (1997) parasitizing the abdominal cavity of the wild rodent, Akodon cursor (Winge, 1887), was found in the abdominal cavity of Nectomys squamipes (Brants, 1827), from the municipality of Rio Bonito, Rio de Janeiro State, Brazil. This study led to addition of new morphological data and a new geographical distribution for this filarioid in Brazil. Several characters were detailed and emended to previous records...

Assessment of different Lippia sidoides genotypes regarding their acaricidal activity against Rhipicephalus (Boophilus) microplus

Alexandra Martins Dos Santos Soares, Tatiane Aranha Penha, Sandra Alves De Araújo, Elizangela Mércia Oliveira Cruz, Arie Fitzgerald Blank & Livio Martins Costa-Junior
Abstract The aim of this study was to select different genotypes of Lippia sidoides with the highest activity against larvae and engorged females of the tick Rhipicephalus (Boophilus) microplus. The germplasms studied were LSID006, LSID102, LSID103 and LSID104. The LSID104 genotype, that presented carvacrol as a major constituent, was the germplasm with the worst larvicide effect (LC50 2.99 mg/mL). The LSID006 genotype was the least effective against engorged females (LC50 12.46 mg/mL), and it was...

Ticks parasitizing bats (Mammalia: Chiroptera) in the Caatinga Biome, Brazil

Hermes Ribeiro Luz, Sebastián Muñoz-Leal, Juliana Cardoso De Almeida, João Luiz Horacio Faccini & Marcelo Bahia Labruna
Abstract In this paper, the authors report ticks parasitizing bats from the Serra das Almas Natural Reserve (RPPN) located in the municipality of Crateús, state of Ceará, in the semiarid Caatinga biome of northeastern Brazil. The study was carried out during nine nights in the dry season (July 2012) and 10 nights in the rainy season (February 2013). Only bats of the Phyllostomidae and Mormoopidae families were parasitized by ticks. The species Artibeus planirostris and...

Data for SCSPOD14, a South China Sea physical oceanographic dataset derived from in situ measurements during 1919-2014

Dongxiao Wang, Rongyu Chen, Lili Zeng, Ju Chen & Weiqiang Wang
In addition to the oceanographic data available for the South China Sea (SCS) from the World Ocean Database (WOD) and Array for Real-time Geostrophic Oceanography (Argo) floats, a suite of observations has been made by the South China Sea Institute of Oceanology (SCSIO) starting from the 1970s. Here, we assemble a SCS Physical Oceanographic Dataset (SCSPOD14) based on 51,392 validated temperature and salinity profiles collected from these three datasets for the period 1919–2014. A gridded...

Single-cell Transcriptome and Epigenomic Reprogramming of Cardiomyocyte-Derived Cardiac Progenitor Cells

Charles Wang, Yiqiang Zhang, Jiang Zhong, Xin Chen, Tushar Kumar Chakravarty & Xiaojin Li
The molecular basis underlying spontaneous dedifferentiation and cell cycle reentry of mammalian adult cardiomyocytes (ACMs) during cardiac tissue regeneration is poorly understood. We present data integrating single-cell transcriptome and whole-genome DNA methylome analyses of mouse ACMs to better understand the epigenomic signatures governing their intrinsic cellular plasticity. Compared to parental cardiomyocytes, dedifferentiated myocyte-derived cardiac progenitor-like cells (mCPCs) display epigenomic reprogramming with many differentially-methylated regions, both hypermethylated and hypomethylated, across the entire genome. Correlating well with...

An agricultural survey for more than 9,500 African households

Katharina Waha, Birgit Zipf, Pradeep Kurukulasuriya & Rashid Hassan
Surveys for more than 9,500 households were conducted in the growing seasons 2002/2003 or 2003/2004 in eleven African countries: Burkina Faso, Cameroon, Ghana, Niger and Senegal in western Africa; Egypt in northern Africa; Ethiopia and Kenya in eastern Africa; South Africa, Zambia and Zimbabwe in southern Africa. Households were chosen randomly in districts that are representative for key agro-climatic zones and farming systems. The data set specifies farming systems characteristics that can help inform about...

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