Karakteristike svježeg kupusa namijenjenog za fermentaciju su čvrste i tvrde glavice s količinom topljive suhe tvari od 3 do 5% i svjetlijom bojom vanjskih listova. Glavice se nakon čišćenja režu u rezance ujednačene širine na stroju za rezanje. Pripremljeni rezanci se važu i miješaju s 2,25 % natrijevog klorida. Temperatura biološke fermentacije je 18-22 °C u tamnom prostoru i u anerobnim uvjetima. Natrijev klorid izdvaja stanični sok zbog osmoze, te se stvaraju uvjeti za razvoj heterofermentacijskih bakterija. Nastala mliječna kiselina i dodan natrijev klorid predstavljaju osnovne čimbenike konzerviranja kupusa. Sorta kupusa Varaždinski najzastupljenija je i ujedno referalna sorta, a druge istraživane sorte su Junior F1, Kilor F1, Krautman F1 i Satelite F1 s proizvodnog područja Ogulina. Kakvoća svježe sirovine i fermentiranog proizvoda kroz dvije godine definirana je količinom suhe tvari (%), topljive suhe tvari (%), % mliječne kiseline, pH-vrijednošću, količinom L-askorbinske kiseline (mg/100 g suhe tvari) i % NaCl.

We present electron spin resonance (ESR) data at 9.4 GHz in the phase separated Pr 0.65 Ca 0.25 Sr 0.10 MnO 3 manganite. The coexistence of two resonance lines are observed below the short-range magnetic-order temperature (T s E255 K). One of the ESR line is a paramagnetic contribution retained from the high-temperature phase. The second contribution appears at T s ; which is associated with the presence of ferromagnetic regions. The two contributions can be seen near the charge-order transition, T CO E210 K: We study the temperature evolution of the resonance field and the linewidth of the ESR lines. r

Effect of pine plantations on soil arthropods in a high Andean forest. One of the most common problems in the Colombian mountains has been the replacement of native vegetation by pine plantations. Soil arthropods are a fundamental component of forest ecosystem, since they participate in the organic matter fragmentation, previous to decomposition. This role is more valuable in high altitude environments, where low temperatures limit the dynamics of biological processes, where the effects of pine plantations on soil arthropods are still not well-known. In a remnant of high-andean forest (Neusa -Colombia) and a pine plantation of about 50 years-old, it was evaluated the composition, richness and abundance of arthropods at surface (S), organic horizon (O) and mineral horizon (A) of soil, to establish the differences associated to the soil use transformation. It was used "Pitfall" sampling to register the movement of the epigeous fauna, and extraction by funnel Berlese for determining the fauna density from O and A horizons. The Shannon and Simpson indexes estimated the diversity at different places and horizons, and the trophic structure of the community was evaluated. Overall, there were collected 38 306 individuals from forest and 17 386 individuals from pine plantation, mainly distributed in Collembola (42.4%), Acari (27%), Diptera (17.6%) and Coleoptera (4.6%). The most important differences were given in the surface, where the mobilization in forest (86 individuals/day) almost triplicates the one in pine plantation (33 individuals/ day). The differences in composition were given in Collembola, Araneae, Hemiptera, Homoptera and Hymenoptera. The dynamics of richness and abundance along the year had significant high values in the native forest than in the pine plantation. The general trophic structure was dominated by saprophagous (75%), followed by predators (14%) and phytophagous (9%), but in two layers of the pine plantation soil (S and O) this structural pattern was not given. Based on the results, it was concluded that pine plantations affect the diversity, composition, community dynamic and trophic structure of soil arthropods. Also, some estimators of soil stability give signals that these effects are reducing the ecosystem function in the region. Rev. Biol. Trop. 58 : 1031-1048. Epub 2010 September 01.

One of the most common problems in the Colombian mountains has been the replacement of native vegetation by pine plantations. Soil arthropods are a fundamental component of forest ecosystem, since they participate in the organic matter fragmentation, previous to decomposition. This role is more valuable in high altitude environments, where low temperatures limit the dynamics of biological processes, where the effects of pine plantations on soil arthropods are still not well-known. In a remnant of high-andean forest (Neusa - Colombia) and a pine plantation of about 50 years-old, it was evaluated the composition, richness and abundance of arthropods at surface (S), organic horizon (O) and mineral horizon (A) of soil, to establish the differences associated to the soil use transformation. It was used "Pitfall" sampling to register the movement of the epigeous fauna, and extraction by funnel Berlese for determining the fauna density from O and A horizons. The Shannon and Simps...

Because of their slow growth, shade-tolerant species remain exposed to foliar damage long before reproductive age. Foliar damage can be controlled through synchronous leaf production and specialized phytochemical strategies. In this study, the dynamics of foliar damage in different cohorts of seedlings were evaluated to determine if the High-Andean species, Clusia multiflora (Clusiaceae) and Drimys granadensis (Winteraceae) appeal to the synchronous leaf production for controlling the herbivory and pathogenical damage, and to establish the possible relations between the healthy state, growth and mortality of seedlings. Since a recently-emerged seedling could not supply the physiological costs of specialized strategies, we expected the highest synchronous leaf production in the youngest individuals, and differences between cohorts in foliar damage. Four variables were measured to evaluate the health state along time, in three cohorts of seedlings: Proportion of predated leaves (P(p))...

The aim of this in vitro study was to evaluate by scanning electron microscopy, the structure, frequency, distribuition and thickness of the prismless layer in superior, medium, lower and bottom of the fissure of erupted primary molars. Twelve sound second lower primary molars were fractured in buccolingual directions for SEM examination. The results showed that the hydroxyapatite cristals were arranged

Preparación de Artículos para la Revista Politécnica Utilizar Mayúsculas en cada Palabra en el Caso del Título _________________________________________________________________________________________________________________________ Revista Politécnica-XXXX 201X, Vol. XX, No. X (ACLARATORIA: PARA LOS ESTUDIANTES EN PROCESO DE GRADUACIÓN, OMITIR ESTE PIE DE PÁGINA) 11. INTRODUCCIÓN Los glucósidos son sustancias producidas por las plantas mediante procesos metabólicos que producen una o más azúcares mediante hidrólisis. El termino glucósido se utiliza para referirse al producto de origen natural que está químicamente ligado a un azúcar. Entonces el glucósido tiene dos partes: el azúcar y la aglicona. La aglicona puede ser un flavonoide, una cumarina, un terpeno o cualquier otro producto natural. Los glicósidos son compuestos amargos, y se hidrolizan fácilmente por enzimas o en presencia de un ambiente ácido.

Reservados todos los derechos de reproducción DECLARACIÓN Yo, Cristian Andrés Flores Cadena, declaro que el trabajo aquí descrito es de mi autoría; que no ha sido previamente presentado para ningún grado o calificación profesional; y, que he consultado las referencias bibliográficas que se incluyen en este documento. La Escuela Politécnica Nacional puede hacer uso de los derechos correspondientes a este trabajo, según lo establecido por la Ley de Propiedad Intelectual, por su Reglamento y por la normativa institucional vigente. __________________________ Cristian Andrés Flores Cadena CERTIFICACIÓN Certifico que el presente trabajo fue desarrollado por Cristian Andrés Flores Cadena, bajo mi supervisión.

INTRODUCCIÓN. El estrés en docentes puede causar afectaciones físicas y conductuales que inciden en la calidad de educación. Para atenuar este riesgo se determinó la presencia del Síndrome de Burnout. OBJETIVO. Analizar presencia Síndrome de Burnout en profesores de una institución de educación superior agronómica y su relación con aspectos psicosociales. MÉTODO. Es un estudio descriptivo-transversal con aplicación del Cuestionario Maslach Burnout Inventory (MBI) para medir la presencia de Síndrome de Burnout y su relación con aspectos psicosociales de los docentes. RESULTADOS. Siete docentes (24,14%) presentan el Síndrome de Burnout, mientras que 21 (72,41%) se encuentran en riesgo y un docente (3,45%) ausenta este síndrome. DISCUSIÓN Y CONCLUSIONES. Únicamente, en la dimensión Despersonalización hubo diferencia estadísticamente significativa en estado civil y campo profesional.