In this paper,the molecular geometry for three tautomers of uracil and four tautomers of cytosine has been analyzed. vibrational IR spectra of the tautomers were   investigated at HF and B3LYP level using the AB initio 6-31G* and LANL2DZ basis sets from the program package Gaussian 98 (A.7 Public Domain version). The physico-chemical and biochemical properties of uracil and cytosine are one of...

Aenasius arizonensis Girault, 1915 (Hymenoptera: Encyrtidae) is a primary parasitoid species of Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae). Some biological characteristics A. at different temperatures were studied to evaluate its potential role against P. in control. Six (15, 20, 25, 30, 35±2, and 25/35±2 °C) determine the most suitable temperature for parasitism. The results sh...

Abstract The scale mealybug, Diaspis echinocacti (Bouché, 1833) (Hemiptera: Diaspididae), is one of the main pests cactus pear in Brazil. objective was to study biological aspects D. at constant temperatures 25, 28, 30, 33 and 35 °C with relative humidity 60 ± 10% photoperiod 12 hours laboratory on cultivar, “Orelha de Elefante Mexicana”, Opuntia stricta [Haw.] Haw. development period (22 days)...

p K h b t m r s w n o 1 1 1 t w w i b b L L a The developmental and reproductive biology of a ew species of predatory Franklinothrips was deterined in the laboratory at three constant temperaures. At the intermediate experimental temperature 25°C), Franklinothrips n. sp. exhibited the greatest arval to adult survivorship, and mated females prouced more progeny of which a greater proportion ere ...

This study was conducted to determine the effects of increased water temperatures on the development of Aedes aegypti immatures under laboratory conditions in Trinidad, West Indies using temperature regulated water baths to cover a range of temperatures from 24-25°C to 34-35°C at a relative humidity of 80%. Two experiments were designed: (1) at constant temperature regimens and (2) under diurna...

Live specimens of benthic foraminiferal species Rosalina leei were subjected to a combination of temperature (25° C, 30° C and 35° C) and salinity (25‰, 30‰ and 35‰) to assess its differential response to the annual range of seawater temperature and salinity reported at the sampling site. A total of 216 specimens were used for the experiment. Within the range of temperature and salinity, to whi...

Solanum capsicoides, commonly known as red soda apple, is a little-studied species with phytotherapeutic characteristics of interest to the pharmaceutical industry. However, little about its agronomic characteristics. Therefore, this study aimed assess effect light, different temperatures, and substrates on germination S. capsicoides seeds. The consisted two experiments: Experiment I - Germinat...