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Now showing items 141-150 of 208
Mortalidad embrionaria y éxito de eclosión en huevos de Trachemys scripta (Testudines: Emydidae) incubados en un área natural protegida
(Universidad de Costa Rica, 1996)
In the northeast of Costa Rica, ilIega! collecting, habitat destruction and heavy predation 011 adult females,
young and eggs of Trachemys scripta produced a population decline in recent years. The slider tUltle has a ...
Evaluación farmacológica y química de Stachytarpheta jamaicensis (Verbenaceae)
(Universidad de Costa Rica, 1996)
Afier intraperitoneal administration of gradual aqueous doses obtained from Stachytarpheta jamaicensis
leaves, the following effects were observed in rats: a reduction of motor activity and the alarm reaction, ataxia, ...
Evaluación química y biológica del efecto de extractos de plantas contra Plasmodium berghei
(Universidad de Costa Rica, 1996)
Extracts from thirteen species of plants were evaluated by "in vivo" antimalarial test against Plasmodium berghei effects. Significant activities were observed in the ethyl acetate and aqueous extracts, elaborated of ...
Estimación de parámetros biologico-pequeros para el pargo mancha Lutjanus guttatus en el Golfo de Nicoya, Costa Rica
(Universidad Nacional [Costa Rica], 1998-01-01)
El pargo manchado Lutjanus guttatus es una de las especies demersales más importantes de la costa del Pacífico de Costa Rica. Este pez demersal es capturado principalmente por la flota artesanal con redes de enmalle y ...
Éxito reproductivo de Caligo atreus (Lepidoctera: Nymphalidae) en condiciones de cultivo
(Universidad de Costa Rica, 1999)
En Río Macho, Cartago, Costa Rica, se estudiaron en cautiverio, los estados del ciclo de vida de
Caligo atreus (Lepidoptera: Nymphalidae), con Heliconia tortuosa (Heliconiaceae) como planta hospedera. Los
huevos fueron ...
Feed consumption, growth and protein utilization of Colossoma macropomum (Cuvier) at different dietary fish meal/soya meal ratios
(Wiley & Sons, 1996)
The effect of a gradual substitution of dietary fish
meal protein by soya meal protein on growth, feed
uptake and protein utilization of 1 g Colossoma macro pomum (Cuvier) was studied at two different dietary
protein ...
Natalidad de Chelydra serpentina (Testudines: Chelydridae) en Costa Rica
(Universidad de Costa Rica, 1996)
Three Chelydra serpentina nests were monitored from September through October 1993. Maximum natality was 92% (mean 33.73%) and seemed to be associated with high temperature potasium and a moderate concentration of calcium ...
Neutralización del efceto hemorrágico inducido por veneno Bothrops asper (Serpentes: Viperidae) por extractos de las plantas tropicales
(Universidad Nacional (Costa Rica), 1999)
Organic extracts representing 48 species included in 30 families of Costa Rican tropical plants were evaluated for their hability to neutralize hemorrhagic acfivity lnduced by the venom of the snake Bothrops aspero Abioassay ...
First Finding Of A Male Aphanolaimus Coomansi (Tsalolichin, 1988) In Tropical Areas
(Universidad Nacional (Costa Rica), 1998)
First finding of a male Aphanolaimus coomansi (Tsalolichin, 1988) in tropical ar eas. Nematropica 30:161-166. The rare aquatic nematode Aphanolaimus coomansi Tsalolichin, 1988 was found in some habitats in Costa Rican ...
Morfometría, época reproductiva y talla comercial de Macrobrachium americanum (crustacea: palaemonidae) en Guanacaste, Costa Rica
(Universidad Nacional, Costa Rica, 1996)
Macrobrachium americanum was collected in the San Amires River, Santa Cruz, Guanacaste, Co sta Rica (lOO 22' 00" N; 85043' 00" W), from March 1984 to Apri11985. Fo r 290 specimens the relationship tota l lengthto tal ...