ANÁLISIS GRÁFICO DE LA RESOLUCIÓN DE UN PROBLEMA QUÍMICO DE REACTIVO LIMITANTE

Se propone una interpretación de la técnica de representación del Mapa Conceptual Híbrido a partir de la extensión a la química escolar de algunos elementos teóricos del Enfoque Ontosemiótico de la Matemática Educativa. Para mostrar la viabilidad de la propuesta, se planteó el objetivo de analizar de manera gráfica, mediante un estudio de casos de carácter descriptivo, el sistema de prácticas implicado en la resolución de un problema químico, por parte de un docente y uno de sus estudiantes, que implicaba el uso del concepto de reactivo limitante. El análisis muestra que, en la resolución del problema, los sujetos se apoyan en objetos químicos como en objetos de tipo químico-matemático, los cuales son conectados y organizados en el sistema de prácticas; el docente llevó a cabo un sistema de prácticas predominantemente interpretativo mientras que el alumno realizó uno mayormente operativo; los sujetos también realizaron cierto conjunto de procesos cognitivos que se encuentran implicados en la producción del conocimiento químico.Palabras clave: Mapa conceptual híbrido, resolución de problemas, reactivo limitante, química escolar, objetos químico-matemáticos.Análise gráfica da resolução de um problema químico de reagente limitanteResumo: É proposta uma interpretação da técnica de representação do Mapa Conceitual Híbrido a partir da extensão à química escolar de alguns elementos teóricos da Abordagem Ontosemiótica à Matemática Educacional. Para mostrar a viabilidade da proposta, o objetivo foi analisar graficamente, por meio de um estudo de caso descritivo, o sistema de prática envolvido na resolução de um problema químico, por um professor e um de seus alunos. , o que implicou na utilização do conceito de reagente limitante. A análise mostra que, para resolver o problema, os sujeitos contam com objetos químicos, bem como objetos químico-matemáticos, que estão conectados e organizados no sistema de prática; o professor realizou um sistema de prática predominantemente interpretativo, enquanto o aluno realizou um sistema predominantemente operacional; os sujeitos também realizaram um determinado conjunto de processos cognitivos que estão envolvidos na produção do conhecimento químico.Palavras-chave: Mapa conceitual híbrido, solução de problemas, reagente limitante, química escolar, objetos químico-matemáticos.Graphical analysis of the resolution of a limiting reagent problemAbstract: An interpretation of the representation technique of the Hybrid Concept Map is proposed from the extension to the school chemistry of some theoretical elements of the Ontosemiotic Approach of Educational Mathematics. In order to show the viability of the proposal, the objective was raised to analyze graphically, through a descriptive case study, the system of practices involved in solving a chemical problem posed in a textual way, by a teacher and one of his students, which involved the use of the concept of limiting reagent. The analysis shows that, in solving the problem, the subjects rely on chemical and chemical-mathematical objects, which are connected and organized in the system of practices; the teacher carried out a predominantly interpretive practice system while the student carried out an operational one; subjects also perform a certain set of cognitive processes that are involved in the production of chemical knowledge.Keywords: Hybrid conceptual map, problem solving, limiting reagent, schoolar chemistry, chemical-mathematical objects.

LA TAREA DOCENTE Y EL CÁLCULO DIFERENCIAL VINCULADOS CON EL PERFIL DE LAS CARRERAS BIOLÓGICAS

La necesidad de incluir la asignatura Cálculo Diferencial en el primer año de las Licenciaturasde Biología, Microbiología y Virología y Bioquímica y Biología Molecular está justificada porla creciente importancia de la aplicación de herramientas matemáticas en la investigación defenómenos, procesos y conceptos biológicos. Para lograr un proceso de enseñanza–aprendizajesignificativo de esa asignatura se hace necesario esclarecer desde un primer momento el vínculode los conceptos básicos tales como función, límite, derivada, y optimización con el perfil deesas carreras. Una forma efectiva de hacerlo es a través de ejercicios o tareas docentes, dondelas funciones no sean entes abstractos, sino que modelen un problema físico, biológico oquímico en particular. En este trabajo se deja constancia de la introducción de un conjunto detareas docentes diseñadas con este objetivo en el proceso de enseñanza- aprendizaje de laasignatura Cálculo Diferencial, se describen estas tareas y presentan los principales resultadosobtenidos de su implementación.Palabras clave: Tarea Docente; Cálculo Diferencial; Ciencias BiológicasA TAREFA DOCENTE E O CALCULO DIFERENCIAL VINCULADOS COM OPERFIL DOS CURSOS DE BIOLOGIAResumoA necesidade de incluir a disciplina Cálculo Diferencial no primeiro ano das Licenciaturas deBiologia, Microbiologia e Virologia, e Bioquímica e Biologia Molecular tem como justificativaa importância crescente da aplicação de ferramentas matemática na pesquisa dos fenómenos,processos e conceitos biológicos. Para conseguir um processo de ensino-aprendizagemsignificativa de essa disciplina se faz necessário esclarecer, desde o primeiro momento, ovinculo dos conceitos básicos tais como função, limite, derivada e optimização com o perfil deesses cursos. Uma forma efetiva de fazer isso é usando exercícios ou tarefas docentes, donde afunções não sejam entidade abstratas, senão que façam a modelagem de um problema fisico,biológico ou químico em particular. Neste trabalho se deixa constância da introdução de umconjunto de tarefas docentes desenhadas com esse objetivo no processo de ensino-aprendizagemda disciplina Cálculo Diferencial, são descritas essas tarefas y se apresentam os principaisresultados obtidos na sua implementação.Palavra chave: Tarefa Docente. Cálculo Diferencial. Biológicas.THE EDUCATIONAL TASK AND THE LINKED DIFFERENTIAL CALCULATIONWITH THE PROFILE OF THE BIOLOGICAL CAREERSAbstractThe necessity to include the subject Differential Calculation in the first year of the Degrees ofBiology, Microbiology and Virology and Biochemistry and Molecular Biology is justified bythe growing importance of the application of mathematical tools in the investigation ofphenomena, processes and biological concepts. To achieve a process of significant teachinglearningof that subject it becomes necessary to clarify from a first moment the bond of the suchbasic concepts as function, limit, derived, and optimization with the profile of those careers. Aneffective form of making it is through exercises or educational tasks, where the functions arenot abstract entities, but rather they model a physical, biological or chemical problem inparticular. In this work perseverance of the introduction of a group of educational tasks is leftdesigned with this objective, in the teaching process - learning of the subject DifferentialCalculation, these tasks are described and they present the main obtained results of itsimplementation.Keywords: Educational Task; Differential Calculation; Biological Sciences

Pengaruh Pemberian Pupuk Organik Guano terhadap Pertumbuhan dan Hasil Tanaman Mentimun pada Lahan Rawa Lebak

Lebak wetland can generally be used as vegetable cultivation land with proper handling. Lebak wetland land has a complex chemical problem. Giving organic material is one way to improve some soil chemical properties. The aim of this research is (i) to know the effect of guano organic fertilizer on the growth and yield of cucumber plants on lebak wetland (ii) to get the best dose of guano organic fertilizer on the growth and yield of cucumber plants on lebak wetland. The research was conducted in the Pasar Senin Village, Amuntai Tengah District, Hulu Sungai Utara Regency from May - July 2012. This study used a randomized block design (RBD), with 5 treatments and 5 replications, so there are 25 units, and each treatment there are 4 plants. Factor test in the guano organic fertilizer that g0 = 0 kg.plot-1, g2 = 0.5 kg.plot-1, g3 = 0.1 kg.plot-1, g4 = 1.5 kg.plot-1 and g5 = 2 kg.plot-1 . Results of this study showed that treatment dosing guano organic fertilizer which was highly significant on plant height ages 7, 14 and 21 DAP, number of leaves aged 7, 14 and 21 DAP, number of fruits, fruit weight and length of the fruit. The best dose of guano organic fertilizer is 10 t.ha-1 equivalent to 1 kg.plot-1 (g2).

SELF-REGULATED LEARNING MODEL WITH MIND MAP TO IMPROVE STUDENTS COGNITION AND METACOGNITION SKILLS IN SOLVING CHEMICAL PROBLEMS

The research has been conducted on the application of Self-Regulated Learning (SRL) model with mind map in solving chemical problem on Hydrolysis Salt material in class XI MIPA . This study aims to improve (1) implementation SRL model with mind map in classroom, (2) student activity, (3) learning outcomes of cognition, and (4) metacognition skills. The study used a classroom action research design consisting of two cycles with four learning meetings and two evaluation meetings. The subjects of this study were students of class XI MIPA 6 SMAN 7 Banjarmasin with 36 students. Instrument of research in the form of metacognition skill and cognition test instrument, observation sheet of teacher and student activity, and questionnaire of metacognition skill. Data were analyzed by using descriptive analysis of quantitative and qualitative. The results showed that there was an increase (1) teacher activity from good category to be very good, (2) student activity from active category become very active, (3) mastery of cognition learning result from 44,44% to 88,89%, and (4) metacognition skills of the category began to develop into a well-developed.

A brief history of Nitrogen fixation

<div>Nitrogen furation has been a subject of great interest to chemists for the best part of a century. As a chemical problem it is possibly unique because the research has really been led by biologists for most of this time. Currently it is being studied by a wide range of scientists of many different stripes, and the interplay between them lends fascination to the topic. Even more, nitrogen futation has been used by humans for at least two thousand years even though the primitive agriculturalists could not have been aware of what was going on.</div><div> </div>

PEMANFAATAN BAHAN AJAR BERDASARKAN MULTI LEVEL REPRESENTASI UNTUK MELATIH KEMAMPUAN SISWA MENYELESAIKAN MASALAH KIMIA LARUTAN

Obeservation results indicated that students have difficulty of explaining chemical phenomena in league level representations (macroscopic, symbolic, and submicroscopic levels). The aim of the study was to obtain the information related to the influence of the use of teaching materials based on multi-level representation of the ability to solve the problem of solution materials of MAN students in Pidie Jaya. The teaching material contained of macroscopic, symbolic, and submicroscopic levels. Type this of research was quasi experiment which was tested in MAN Pidie Jaya. The study was conducted for four months through two stages namely: (1) observasion, (2) implementation. Implementation was carried out by using one-group pre-test design and post-test design. Instruments used consist of; observation sheets, note sheets of learning constraints, assessment and problem solving and representation sheets, and student response questionnaires. The data were obtained them analyzed descriptively. The results showed: (1) the ability chemical problem solving in MAN Ulim Pidie Jaya was increased from the average of 43 pre-test to 73 in post-test result this means that the teaching materials based on multi level representation used can train the ability to solve problem the solution, (2) the profile of students' ability movement during the learning process using teaching materials based on multi level representation increased at one to three meetings, this happened because the fourth meeting material characteristic was more complex, (3) based on student response to the using of teaching materials based on multi level representation was very helpful in training solve chemical problems of solution.