The flicker response contour for the frog Rana pipiens exhibits the duplex character typical for most vertebrates. By comparison (under the same conditions of temperature, 21.5 degrees , and light-time fraction, = 0.5), the low intensity section of the F - log I curve is the smallest thus far found. The cone portion of the curve is satisfactorily described by a probability integral. The rod par...

If an organism's juvenile and adult life stages inhabit different environments, certain traits may need to be independently adapted to each environment. In many organisms, a move to a different environment during ontogeny is accompanied by metamorphosis. In such organisms phenotypic induction early in ontogeny can affect later phenotypes. In laboratory experiments we first investigated correlat...

colocasia esculenta linn (ce) is traditionally used for the treatment of various ailments such as high blood pressure, rheumatic pain, pulmonary congestion, etc. hence in present study, the effect of aqueous extract of ce leaves (aece) was evaluated for antihypertensive and acute diuretic activity in rats. preliminary phytochemical evaluation revealed the presence of carbohydrate, saponins, tan...

Growth and biochemical performance of Manihot esculenta Crantz (TMS 0505) amended with Centrosema pubescens and NPK fertilizer were carried out. Contamination levels of 2%, 4%, and 6% were used while amelioration treatments C. pubescens and NPK 15:15:15 were carried out by adding organic supplement (decomposed Centrosema pubescens) and NPK at the rate of 0.25Kg per 5Kg of soil to the various le...

The vasotocin level in the blood of hens during oviposition was determined on the isolated bladder of the frog, Rana esculenta. It was found that 10 min before oviposition, the vasotocin level in blood sudden¬ ly increased. During oviposition, it was forty-six times higher (P<0-01) than that in hens with no egg in the uterus. After oviposition, the activity of vasotocin in the blood rapidly dec...

The aim of this study was to investigate whether primary vestibular afferent fibers establish direct connections with the motor and sensory trigeminal system in the brainstem of the frog. The experiments were carried out on Rana esculenta. In anaesthetized animals the trigeminal and vestibular nerves were prepared, and their proximal stumps were labeled either with fluorescein binding dextran a...

Cassava (Manihot esculenta Crantz) is a vitally important food source for many people in developing tropical countries. There are signifi cant opportunities for improving the compositional qualities and pest resistance of cassava, and modern biotechnology is expected to play an important role in these improvements. The testing and development of genetically modifi ed cassava will of course be s...

A crude enzyme extract from Dioscorea esculenta var. fasiculata tissue subjected to ion exchange chromatography on DEAE-Sephadex A-50 column. This procedure resolved the extract into two main protein peaks one of which eluted through the column relatively unbound while the other protein peak which remained bound to the column was eluted with 1.0 M NaCl. Both protein peaks contained polyphenol o...

A história ambiental da Amazônia é caracterizada como um centro de domesticação independente plantas, dentre elas, a mandioca dos índios (Manihot esculenta Crantz). Por meio produção conhecimento etnográfico, combinado à pesquisa bibliográfica referente ao tema, discute-se, no presente artigo, o processo do gênero Manihot partir das narrativas diferentes povos originários atual ente federado Am...