Quimerismo 60,xx/60,xy e freemartismo em bovinos nascidos de partos gemelares heterossexuais.

Foram estudados citogeneticamente 42 bovinos nascidos de partos gemelares heterossexuais, sendo 10 casais, 19 fêmeas e três machos de várias raças, principalmente, Holandesa (17) e Pardo Suíça (11), pertencentes ao Instituto de Zootecnia-APTA, Nova Odessa, SP, e a produtores particulares de outras regiões do Estado. A análise citogenética foi realizada em metáfases obtidas após culturas de linfócitos. Em 90,5% (38) dos animais, foi observado o quimerismo 60,XX/ 60,XY com 1,8 a 90,2% de células femininas. Considerando todos os animais quiméricos, foram analisadas 3806 células, sendo 1268 XX (33,3%) e 2538 XY (66,7%). Em nove casais, as freqüências de células femininas foram 24,8 e 21,5% e as de masculinas de 75,2 e 78,5% para fêmeas e machos, respectivamente. Em um casal, não foi evidenciada troca de células, e a fêmea apresentou somente células de linhagem feminina e o macho, de linhagem masculina. Três das fêmeas avaliadas eram adultas e foram abatidas. Seus aparelhos genitais apresentaram vários graus de masculinização como: aumento do clitóris, subdesenvolvimento da vagina, da cérvix (ausente em uma fêmea), do útero, das tubas uterinas, presença de glândulas vesiculares e gônadas ovotestis, (testículos e pênis rudimentares foram encontrados em uma fêmea). O cariótipo 60,XX foi observado em apenas três fêmeas das 29 analisadas: duas delas apresentaram todas as características de fêmea normal e inclusive pariram com aproximadamente 30 meses de idade; a outra fêmea ainda não atingiu a idade de reprodução, mas parece apresentar função reprodutiva normal. Dos 13 machos analisados, 12 apresentaram quimerismo 60,XX/60,XY e um apresentou cariótipo normal (60,XY). A análise citogenética é um meio eficaz e pouco oneroso de constatar freemartismo em fêmea bovina gêmea com macho, permitindo o diagnóstico precoce e a oportunidade de eliminação do processo reprodutivo os animais portadores de quimerismo, de maneira a baixar os custo com manejo e a diminuir a freqüência desta anomalia nos rebanhos

Student receptiveness to Kahoot! in higher education

The use of technology in higher education has been increasing in the past few years and new online tools have emerged for very different purposes. Kahoot! is an example of a platform that can be used for reviewing content and motivating students for learning. Our research is based on data from a quantitative survey conducted in the previous school year and the participants were 86 undergraduate students from a Portuguese higher education institution. The preliminary results of the survey showed that students are very receptive to this tool and highly recommend it, as it promotes motivation. Other studies have shown that higher education students are usually receptive to web tools and consider technology can positively impact learning. To better understand students’ responses to the platform, in this study we aim at analysing the results according to area of study and investigating new correlations between variables, specifically (i) gender vs receptiveness to Kahoot!, (ii) gender vs recommendation of its use and (iii) technology readiness vs receptiveness to Kahoot!.info:eu-repo/semantics/publishedVersio

Kahoot! and socrative in higher education: a comparative study

Technology brings new challenges and opportunities to higher education institutions, as it can promote learner-centered activities. Mobile devices such as smartphones are very popular among students and can easily engage them and promote motivation and active learning. In this study, we investigate Tourism undergraduate students’ perceptions on the use of mobile technology in the classroom, specifically two quiz makers in a comparative perspective: Kahoot! and Socrative. The purpose of this two-stage study is to identify and meet students’ preferences, so as to design activities that can truly promote learning. The participants are Mathematics and English students from a Portuguese higher education institution. At the first stage, in a preliminary survey, 33 students have identified their quiz preferences and most of them (87,88%) selected Socrative as their favourite quiz maker. At the second stage, students were also inquired about their general perceptions and preferred features, such as collaborative mode, competition mode, self-paced mode or immediate feedback. Similar studies have shown that these tools can promote engagement, motivation, concentration and learning. Therefore, we hope to contribute to a better understanding of how technology can improve the learning process.info:eu-repo/semantics/publishedVersio

Enhancing students’ motivation with Kahoot!: a case study in English and mathematics

In the last few decades, technology has advanced in multiple fields, including Education. Some of its benefits include improving student performance and motivation, fostering active learning and tracking student progress. As a "new learning generation" is around, profound changes to the role and function of both teachers and students are particularly vital, so active, cooperative and participative methodologies of learning must be privileged. Given that most higher education students are technology savvy and very receptive to the integration of Web 2.0 tools in class, the teachers involved in this study began using Kahoot! in their classes as an alternative teaching methodology. The participants in the study are undergraduate students from a Portuguese higher education institution and encompassed the curricular units of Statistical Analysis and English. The aim of the study is to investigate students’ perceptions of how Kahoot! can be used as a tool for testing new vocabulary, reviewing class content or designing warm-up activities. A quantitative survey is being conducted to gather information about students’ insights on the use of Kahoot!. Similar studies have shown that students are generally receptive to the use of this tool and find it useful to increase their motivation.info:eu-repo/semantics/publishedVersio

Assessing students' engagement levels during lockdown: a survey in tourism degrees

In early 2020, the crisis of a new virus and a pandemic context took the world by storm. All sectors of society were affected: health, economics,… and education was no exception, with all levels suspending face-to-face classes, which were replaced by online activities. In view of this situation, several doubts and uncertainties emerged among educators, but one question stood out: how to proceed with teaching activities in the online format without compromising the commitment and engagement of the students? Within this context, the teachers involved in this study sought to adapt the activities and teaching materials to the exclusive use of technology and promoted asynchronous tasks, which could be developed independently by the students. In order to understand how the profound changes in Higher Education were experienced by students, a quantitative survey was conducted. The participants in the study are undergraduate students from a Portuguese Higher Education institution attending the curricular units of Statistical Analysis and English.info:eu-repo/semantics/publishedVersio

Recodificando o aplicativo móvel Agritempo a partir de requisitos identificados no processo de validação.

A redefinição de código de aplicativos é de suma importância para que sejam atendidas efetivamente as necessidades do público-alvo. A utilização desta prática propõe revisar, corrigir e/ou adicionar recursos no projeto com base nos dados identificados após as etapas de validação realizadas com futuros usuários, durante o processo de desenvolvimento de software. A revisão de código normalmente é feita após a apresentação de um protótipo aos stakeholders, gerando um relatório contendo os principais pontos a serem revisados. O processo utilizado na validação do aplicativo Agritempo tinha por objetivo a melhoria do aplicativo de forma geral para atender à demanda das diferentes classes de usuários, tornando simples a experiência destes

Phase diagram of the antiferromagnetic XY model in two dimensions in a magnetic field

The phase diagram of the quasi-two-dimensional easy-plane antiferromagnetic model, with a magnetic field applied in the easy plane, is studied using the self-consistent harmonic approximation. We found a linear dependence of the transition temperature as a function of the field for large values of the field. Our results are in agreement with experimental data for the spin-1 honeycomb compound BaNi_2V_2O_3Comment: 3 page