13 research outputs found
1D Frustrated Ferromagnetic Model with Added Dzyaloshinskii-Moriya Interaction
The one-dimensional (1D) isotropic frustrated ferromagnetic spin-1/2 model is
considered. Classical and quantum effects of adding a Dzyaloshinskii-Moriya
(DM) interaction on the ground state of the system is studied using the
analytical cluster method and numerical Lanczos technique. Cluster method
results, show that the classical ground state magnetic phase diagram consists
of only one single phase: "chiral". The quantum corrections are determined by
means of the Lanczos method and a rich quantum phase diagram including the
gapless Luttinger liquid, the gapped chiral and dimer orders is obtained.
Moreover, next nearest neighbors will be entangled by increasing DM interaction
and for open chains, end-spins are entangled which shows the long distance
entanglement (LDE) feature that can be controlled by DM interaction.Comment: 8 pages, 9 figure
Biochemical Hypermedia: Glucose as a Central Molecule in Metabolism
The technologies of information, together with education resources, have been pointed out as a solution to the improvement of teaching approach, but they still claim for programs to fulfill the demands of didactic materials. So, a biochemical software was developed aiming to contribute for the better understanding of the glycolysis. It was prepared with the help of concept maps, ISIS Draw, ADOBE Photoshop and FLASH MX Program. The introduction screen shows a teacher in a theater presenting glucose as a central molecule in the metabolism of animals, plants and many microorganisms. She invites for a better knowledge of glucose through a view of its discovery and its metabolism. A step by step animation process shows the interaction of glucose in aerobic conditions with the enzymes of the glycolytic pathways and its products. An explanation text of each enzyme catalytic process is provided by links. A static pathway is always available through a link. The fates of pyruvate yielding lactic acid and ethanol under anaerobic conditions are shown as well. The overall reactions of gluconeogenesis and the functional significance of this pathway are presented. The experimental treatment involved the presentation of this hypermedia for Nutrition undergraduate students (UFSC) as a tool for better comprehension of the theme. The students revealed that it was extremely effective in promoting the understanding of the enzymatic mechanisms involved in glycolysis. This suggests that there is a significant added value in employing the software as an instructional effort to enhance student’s abilities to understand biochemical pathways
Enzyme Teaching by a Virtual Laboratory
Biochemistry learning demands skills to obtaining and interpreting the experimental data. In a classical model of teaching involve student’s hands-on participation. However this model is expensive, not safe and should be carried out in a short and limited time course. With utilization of educational software these disadvantages are overcome, since the virtual activity could be realized at free full access, and is a tool for individual study. The aim of the present work is to present educational software focused on a virtual for undergraduate student of biochemistry courses. The software development was performed with the help of concept maps, ISIS Draw, ADOBE Photoshop and FLASH MX Program applied on the subject salivary amylase. It was possible to present the basic methodologies for study of the kinetic of enzyme. The substrate (starch) consumption was determinate by iodine reaction, while the products (reducing sugars) formation was evaluated by cupper-alkaline reaction. The protocols of the virtual experiments are present verbally as well as a subtitle. A set of exercises are disposable, which allowed an auto evaluation and a review of the subject. The experimental treatment involved the presentation of this hypermedia for Nutrition and Dentistry/UFSC undergraduate students as a tool for better comprehension of the theme and promoted the understanding of the kinetic of enzyme
Virtual Biochemistry – pH effect on enzyme activity
Protocols of laboratory experiments, followed by teacher's explanation, not always clearly translate to the student the dynamics to beadopted for the implementation of the proposed practice. One of these cases is related to the study of the effect of pH on enzyme activity. For better help the understanding of the technical procedure, a hypermedia was built based on a protocol adopted at the Department of Biochemistry, UFSC. The hypermedia shows how theeffect of variations in pH can be observed in vitro. Taking as example salivary amylase and the consumption of starch (substrate) by means of iodine staining, a set of pH buffers was tested to identify the best pH for this enzyme activity. This hypermedia as introductory tool for such practice was tested on aNutrition course classroom. Students agree that the hypermedia provided a better understanding of the proposed activities. Teachers also notice a smallerreagents consumption and reduction of the time spent by the students in the achievement of the experiment
Biochemical software: Carbohydrates on Laboratory
Educators around the world are being challenged to develop and design better and more effective strategies for student learning using a variety of modern resources. In this present work, an educa- tional hypermedia software was constructed as a support tool to biochemistry teaching. Occurrence, structure, main characteristics and biological function of the biomolecule Carbohydrates were pre- sented through modules. The software was developed using concept maps, ISIS-Draw, and FLASH- MX animation program. The chapter Carbohydrates on Laboratory illustrates experimental methods of carbohydrates characterization, through animation of a laboratory scenery. The subject was de- veloped showing reactions as Bial, Benedict, Selliwanoff, Barfoed, Phenol Sulphuric, and Iodines, and also enzymatic reactions as glucose oxidase and amylase. There are also links with short texts in order to help the understanding of the contents and principles of laboratory practice as well as background reactions. Application of the software to undergraduate students and high school teachers showed an excellent acceptance. All of them considered the software a very good learning tool. Both teachers and students welcomed this program as it is more flexible, and allows the learning in a more individual rhythm. In addition, application of the software would be suitable to a more effective learning and it is less expensive than conventional experimental teaching
Carbohydrates Through Animation: Preliminary Step
Methods of education are changing, so the educational tools must change too. The developmentof the systems of information and communication gave the opportunity to bring new technology tothe learning process. Modern education needs interactive programs that may be available to theacademic community, in order to ease the learning process and sharing of the knowledge. Then,an educational software on Carbohydrates is being developed using concept maps and FLASH-MXanimations program, and approached through six modules. The introduction of Carbohydrates wasmade by the module Carbohydrates on Nature, which shows the animations gures of a teacher andstudents, visiting a farm, identifying the carbohydrates found in vegetables, animals, and microor-ganisms, integrated by links containing short texts to help understanding the structure and functionof carbohydrates. This module was presented, as pilot experiment, to teachers and students, whichdemonstrated satisfaction, and high receptivity, by using animation and interactivitys program asstrategy to biochemistrys education. The present work is part of the project Biochemistry throughanimation, which is having continuity