La presente tesis denominada "Comportamiento de la trabajabilidad de la madera Terminalia oblonga (Ruiz &Pay.) Steud. (yacushapana amarilla), de la zona de Pucallpa", tuvo como objetivo principal determinar el comportamiento al maquinado de la madera de la especie Terminalia oblonga (Ruiz 8tPav.) Steud., mediante los ensayos de cepillados, moldurado, taladrado, lijado y torneado, considerando los planos de corte. El método fue experimental utilizando como muestra cinco árboles representativos en diámetro, altura y buen estado fitosanitario. Las probetas se obtuvieron considerando los niveles del fuste (basal, medio y apical), planos de corte (oblicuo, tangencial, radial) y sentidos de corte (favor y contra del grano). Las probetas fueron trabajadas en los ensayos de cepillado, moldurado, lijado, taladrado y torneado, para luego ser evaluadas mediante la comparación de resultados. Dad...

vsotelo@ulima.edu.pe; fparedes@ulima.edu.pe; ecieza@ulima.edu.pe

The "Peruvian hake" Merluccius gayi peruanus (Ginsburg, 1954), is the most abundant and economically important fish in the trawl fishery in Peru. The aim of this study was to assess the parasitological indices of Peruvian hake M. gayi peruanus from the Fishing Terminal of Chorrillos during the months of January to February 2014. Parasites were collected, fixed, preserved and quantified using standard procedures. A total of fifteen parasite species, with a mean total abundance and species richness of 1.55 and 0.90 was collected. Ectoparasites were represented by the monogenean Anthocotyle americana and copepod Caligus debueni and Neobrachiella insidious pacifica. Endoparasitic digeneans were Aporocotyle wilhelmi, Derogenes varicus and Lecithochirium genypteri. The tapeworms were Diphyllobothrium pacificum, Diphyllobothrium arctocephalinum, Callitetrarhynchus gracilis and Clestobothrium cr...

A hematological and blood biochemical evaluation was performed on 10 species of marine fish in the bay of Callao, Peru, in the four seasons of the year and in four sampling areas with different degrees of anthropic disturbance. The species of fish were: «lorna» Sciaena deliciosa (Tschudi, 1846) (Sciaenidae), «lisa» Mugil cephalus Linnaeus, 1758 (Mugilidae), «pejerrey» Odontesthes regia (Humboldt, 1821) (Atherinidae), «pintadilla» Cheilodactylus variegatus Valenciennes, 1833 (Cheilodactylidae), «tramboyo» Labrisomus philippii (Steindachner, 1866) (Labrisomidae), «borrachito» Scartichthys gigas Steindachner, 1876 (Blenniidae), «mojarrilla» Stellifer minor (Tschudi, 1846) (Sciaenidae), «machete» Ethmidium maculatum (Valenciennes, 1847) (Clupeidae), «cavinza» Isacia conceptionis (Cuvier, 1830) (Haemulidae) and «chiri» Stromateus stellatus Cuvier, 1829 (Stromateidae). The ...

Se realizó una evaluación hematológica y de bioquímica sanguínea en 10 especies de peces marinos en la bahía del Callao, Perú, en las cuatro estaciones del año y en cuatro áreas de muestreo con diferentes grados de perturbación antrópica. Las especies de peces fueron: “lorna” Sciaena deliciosa (Tschudi, 1846) (Sciaenidae), “lisa” Mugil cephalus Linnaeus, 1758 (Mugilidae), “pejerrey” Odontesthes regia (Humboldt, 1821) (Atherinidae), “pintadilla” Cheilodactylus variegatus Valenciennes, 1833 (Cheilodactylidae), “tramboyos” Labrisomus philippii (Steindachner, 1866) (Labrisomidae), “borrachito” Scartichthys gigas Steindachner, 1876 (Blenniidae), “mojarrilla” Stellifer minor (Tschudi, 1846) (Sciaenidae), “machete” Ethmidium maculatum (Valenciennes, 1847) (Clupeidae), “cavinza” Isacia conceptionis (Cuvier, 1830) (Haemulidae) y “chiri” Stromateu...

Tagetes elliptica Smith "Chincho", or "black mint sacha" is a plant used as a biocide in ecological agriculture mainly for its essential oils like cis/trans-Epoximyrcene. Dimethoate is an organophosphate insecticide with action of contact and ingestion. The aim of this study was to evaluate the acute and chronic toxicity of T. elliptica and dimethoate on six predators and parasitoids of agricultural pests from Peru. Toxicity tests for Chrysoperla externa, Ch. asoralis, Orius insidiosus, Geocoris callosulus, Trichogramma pretiosum and T. pintoi used T. elliptica and dimethoate with five concentrations plus control. Regarding acute tests with the "chincho", it was observed the following sequence from highest to lowest based on toxicity of median lethal concentration (LC50 (48 h): C. externa > T. pretiosum > C. asoralis > T. pintoi > O. insidiosus (nymph) > O. insidiosus (adu...