a participatory rural appraisal technique (prat) was used to obtain information from 132 randomly selected turkey farmers in two out of four agricultural development zones in kwara state, nigeria. data were obtained on socio-occupational status of farmers, their production objectives, experience, flock structure, management practices, marketing and consumption of turkey eggs. the results showed...

This paper presents how inkjet colour is affected by firstly the substrate and secondly exposure to light and the combination of both. The research uses both pigmented and dye based inks printed onto coated and uncoated fine art papers, and are subjected to light conditions that are constantly changing through out the day and consequently the year. Although benchmark conditions and standards as...

Measurement of colour discrimination loss is particularly important in demanding visual tasks where colour is used to enhance visual performance. Ideally, colour vision assessment requires a test that (I). provides true isolation of colour signals, (II). is based on data that describe the statistical limits of colour discrimination in “normal” trichromats, (III). has enough sensitivity to detec...

Colour vision allows animals to reliably distinguish differences in the distributions of spectral energies reaching the eye. Although not universal, a capacity for colour vision is sufficiently widespread across the animal kingdom to provide prima facie evidence of its importance as a tool for analysing and interpreting the visual environment. The basic biological mechanisms on which vertebrate...

The presence of lignin and its degraded products such as tannin and humic acids is the main reason causing the aerobically-treated palm oil mill effluent (AT-POME) to display colour at the point of discharge. In this work, a hybrid method is developed to treat the AT-POME sample that was conventionally treated by biological method. This hybrid method combines coagulation and nanofiltration (NF)...

This work was inspired by a recent case of child abuse where the question of the age of the bruises on the body was raised. The first part of this paper reviews published work on bruises. It illustrates the paucity of work in this field and the absence of studies of the colour changes in bruises of human skin with time. The second part of this paper consists of our own study of the appearance o...

Aim: To investigate the effects of oral nimodipine on ocular haemodynamic parameters and colour contrast sensitivity in patients with normal tension glaucoma (NTG). Design: The study was performed in a randomised, placebo controlled, double masked, crossover design. Participants: Nimodipine (60 mg) or placebo was administered to 14 consecutive NTG patients. Methods: The effects or oral nimodipi...

AIM To investigate the effects of oral nimodipine on ocular haemodynamic parameters and colour contrast sensitivity in patients with normal tension glaucoma (NTG). DESIGN The study was performed in a randomised, placebo controlled, double masked, crossover design. PARTICIPANTS Nimodipine (60 mg) or placebo was administered to 14 consecutive NTG patients. METHODS The effects or oral nimodi...

Our earlier psychophysical work has shown that colour and motion are not perceived at the same time, with colour leading motion by about 50-100 ms. In pursuing this work, we thought it would be interesting to use a more complex colour stimulus, one in which the wavelength composition of the light reflected or emitted from surfaces changes continually, without entailing a change in the perceived...