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In this paper, it is presented two math teachers' discourse analysis results, to identify the possible incidence of the metaphorical language used by them, in the learning of the concept of a complex number with ninth grade students. The analysis of the metaphorical language of the teacher is done in the light of the Cognitive Theory of Mathematics. It seeks the understanding of mathematics in the metaphorical thinking of people, and not in the rigorous demonstrations of books, emphasizing the connection that has the body with the cognitive processes, inducing the main key for the reform of teaching and learning processes focused on mathematical communication. [ABSTRACT FROM AUTHOR]

Copyright of Revista Colombiana de Biotecnología is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Entre Ciencia e Ingeniería is the property of Entre Ciencia e Ingenieria and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista de Ciencias is the property of Universidad del Valle and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Médica Clínica Las Condes is the property of Editorial Sanchez y Barcelo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Médica Clínica Las Condes is the property of Editorial Sanchez y Barcelo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Introduction: The calcium-binding protein calbindin (CB) plays a critical role in intracellular calcium metabolism. In a previous study we demonstrated that the infection with fixed rabies virus caused loss of CB expression in mouse brain during terminal state of the disease, 7-8 days after intramuscular inoculation.Objectives: To determine loss of CB expression also appears in early stages of the infection and if it is a consequence immediate to the appearance of viral antigens in the brain.Materials and methods: Mice were inoculated with fixed rabies virus, by intramuscular route, in the left hind limbs. Daily, to sixth day, 4-6 animals and their respective controls were killed and fixed by intracardiac perfusion with paraformaldehyde and their brains were extracted to obtain coronal sections using a vibratome. Free-floating sections were treated by immunohistochemical procedures to evaluate the presence of rabies viral antigens and the expression of CB. The last one was quantified by optical densitometry in a microscope with a system of image analysis.Results: Rabies immunoreactivity was observed in the brain three days after virus inoculation, beginning in pyramidal neurons of the frontal cortex whereas the immunostaining for CB did not undergo any qualitative nor quantitative changes neither in the cerebral cortex or striatum during the six days post-inoculation.Conclusions: These results agree with other studies in which it has been settled down that the rabies molecular or metabolic effects on the nervous system are well-known only in the final stage of the disease. [ABSTRACT FROM AUTHOR]

Copyright of Estudios Gerenciales is the property of Universidad ICESI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Colombia Medica is the property of Universidad del Valle and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Classical Swine Fever is a highly contagious disease; it is endemic in Cuba and under control by a program that includes vaccination with the live attenuated vaccine of the lapinized Chinese strain (LABIOFAM, S.A.,) of proven safety and effectiveness. For the advantages provided by the use of a marker vaccine in advanced stages of the disease control, a subunit vaccine candidate based on virus E2 glycoprotein of the Classical Swine Fever was evaluated in the field. The serological response induced by the new vaccine candidate was compared with that induced by the Chinese strain in the same epidemiological scenario. The selected pig farm had a history of clinical manifestation of the disease and was subjected to a routine vaccination with the Chinese strain. The humoral immune response in animals vaccinated with both products was evaluated by the neutralization peroxidase-linked assay (NPLA). For this purpose, blood samples were examined at different phases of the technological cycle. The sera of the animals tested with the vaccine candidate showed that they remained with high titers (≥1:100) until the end of the fattening period, differing from those animals vaccinated with the live attenuated vaccine of the Chinese strain. It was also found that the Relative Risk of having antibody titers <1:50 was 12.2 times higher in the animals vaccinated with the Chinese strains than in those vaccinated with the vaccine candidate. [ABSTRACT FROM AUTHOR]

Results of serological surveys for brucellosis, leptospirosis, bovine herpesvirus1 (BHV-1), bovine viral diarrhea (BVD) and Neospora caninum from 1999 to 2009 were reviewed to analyze the behavior of infectious agents affecting bovine reproduction in the Department of Caquetá, Colombia,. The information was obtained from the data base of ICA (Colombian Agricultural Institute), sectional Caquetá. The variables considered were: infectious agents, years, municipalities, regions and sexes. The percentage of seropositive to brucellosis was 6.4% and the highest values were obtained for bovine herpesvirus 1 (BHV-1). In the case of Neospora, research began in 2007 and only 36 samples were worked in 3 years, of which 12 were seropositive (33.3%). There were differences between municipalities, regions and sexes. In the latter case, females had higher seropositivity than males except for BHV-1. Although the number of animals studied in some cases was low, it was concluded that infectious agents affecting reproduction appear to be significant in the department of Caquetá and their role among the causes of reproductive problems needs to be study in depth. [ABSTRACT FROM AUTHOR]

Rhizophora mangle (L.) aqueous extract and its major polyphenolic fraction were evaluated in an aseptic open wound healing model in rats in order to evaluate their antioxidant properties and the effect on redox balance during the wound reparation process. Wound healing was evaluated at the seventh day measuring the wound area (mm²) using MADIP 3.0 Lab Lapdis Image Digital Processing System from Carlos J. Finlay Hospital. The redox balance during wound reparation process was analyzed using the indicators: superoxide dismutase, catalase, reduced gluthatione and malondialdehyde in the new tissue at 0, 3, 7 and 14 days after provoking the wounds. The results showed that Rhizophora mangle (L.) aqueous extract had antioxidant properties in vivo and its major polyphenolic fraction was responsable of this effect. Beside, the treatment of cutaneous wounds with these preparations reduced the wound area (p<0,05) and modified the redox balance during the tissue reparation process. Antioxidant activity of the extract and its fraction can explain, at least in part, the wound healing accelerator effect shown in previous studies. [ABSTRACT FROM AUTHOR]

CIKRON-H and its major component were evaluated under stress conditions through the chromatographic profile, tannin indicators and polymerized polyphenolic compounds. Liquid chromatography with a reverse phase colum (C18) and methanol at 60% as mobile phase was used. The indicators that better reflect the degradation of the major component in CIKRON-H were total tannins, percentage of polymerized polyphenolic compounds (PPC) and chromatographic profile. The major compound partially purified showed a higher effect to oxidation than the product, increasing its coloration. Hydrogen peroxide constituted the best model to simulate an oxidation in the product under stress conditions. [ABSTRACT FROM AUTHOR]

The stability of the product CIKRON-H was evaluated in two presentations at real time during 12 months (flasks of polyethylene of high density with capacity for 30 and 500 mL). The indicators: pH, total tannins (TT), percentage of polymerized polyphenolic compounds (PPC), chromatographic profile of PPC and inhibition halo of the product did not show significant differences (p<0.05) between these presentations at zero time. The indicators that most varied in the time were: percentage and chromatographic profile of PPC and inhibition halo of the product, showing a significant regression coefficient (p<0.00001) from multiple regression analysis. The in vivo study for the evaluation of the antimicrobial activity and the accelerating effect in the cure process of skin wounds of the CIKRON-H lots at 12 months presented a similar behavior with a lot of new CIKRON-H (two months old). The validity period of the product CIKRON-H was established in 12 months. [ABSTRACT FROM AUTHOR]

Vaccination was applied in a pig herd using an E2 vaccine candidate against classical swine fever (CSF). The sows received a two-dose vaccination schedule (25 µg) at intervals of 21 days. To evaluate the safety of E2 vaccine candidate in pregnant sows up to the second third of gestation, the reproductive performance of these sows was compared with a group of non-vaccinated sows in the last third of the gestation period. Data about repetitions of zeal, abortions, number of offsprings per litter and pups weaned per breeding by sow were registered. When comparing parameters between groups there were no differences. E2 vaccine candidate against CSF is safe when it is applied to pregnant sows until the second third of pregnancy. [ABSTRACT FROM AUTHOR]