New Reflectometer and Its Use for Whiteness Measurement*

Hunter, Richard S.

doi:10.1364/josa.50.000044

Cited by 36 publications

(14 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Trapped flies were removed and counted twice a week. Size (diameter) and colorimetric properties were measured on 20 marked fruit of the same age, with a chromameter (CR‐300; Minolta, Osaka, Japan), based on Hunter’s (1960) three‐dimensional system. Hue (or what we usually mean by ‘colour’) is the wavelength within the visible‐light spectrum at which the energy output from a source is greatest.…”

Section: Methodsmentioning

confidence: 99%

Oviposition preference in the oligophagous tomato fruit fly, Neoceratitis cyanescens

Brévault

Quilici

2009

Entomologia Exp Applicata

View full text Add to dashboard Cite

We assessed the role of visual and olfactory cues on oviposition preference in the oligophagous tomato fruit fly, Neoceratitis cyanescens (Bezzi) (Diptera: Tephritidae). In a field survey, we evaluated the stage of susceptibility of field‐grown tomatoes by monitoring N. cyanescens infestations from fruit‐setting up to harvest, in relation to post‐flowering time, size, and visual properties of fruit. In two‐choice laboratory experiments, we tested the degree to which females use visual and olfactory cues to select their host plant for oviposition. In addition, we investigated the ability of flies to avoid fruit already infested by conspecific eggs or larvae, and the influence of natal host fruit on oviposition preference. Neoceratitis cyanescens females preferentially lay their eggs in small yellow‐green unripe fruit (2–3.5 cm diameter, 10–21 days post‐flowering). Damage to fruit was significantly affected by brightness and size properties. In laboratory experiments, females chose to lay their eggs in bright orange rather than yellow domes. On the sole basis of olfactory stimuli, females showed a significant preference for unripe vs. ripe host fruit, for unripe fruit vs. flowers or leaves, and for host vs. non‐host fruit (or control). However, colour interacted with odour as females dispatched their eggs equally between the yellow dome and the bright orange dome when unripe fruit of tomato was placed under the yellow dome vs. ripe fruit under the bright orange dome. When offered real ripe and unripe tomatoes, females preferred unripe tomatoes. Females significantly chose to lay eggs in non‐infested fruit when they were given the choice between these or fruit infested with larvae. In contrast, recent stings containing eggs did not deter females from laying eggs. Rather, they could have an attractive effect when deposited within <1 h. Regardless of their natal host plant, tomato or bugweed, N. cyanescens females laid significantly more eggs in a dome containing bugweed fruit. However, 15% of females originating from tomato laid eggs exclusively in the dome with tomato, against 3% of females originating from bugweed.

show abstract

Section: Methodsmentioning

confidence: 99%

Oviposition preference in the oligophagous tomato fruit fly, Neoceratitis cyanescens

Brévault

Quilici

2009

Entomologia Exp Applicata

View full text Add to dashboard Cite

show abstract

“…They were first painted with watercolor and then covered with a thin layer of colorless wax to mimic vegetal appearance. The characteristics of colors were measured with a chromameter (CR‐300 Minolta, Osaka, Japan), based on Hunter's three‐dimensional system (1960). Also, reflectance analyses were performed with the aid of a spectrophotometer equipped with an integrative sphere (Varian Cary 17 D, Biometry Unit, INRA, Avignon, France).…”

Section: Methodsmentioning

confidence: 99%

Visual response of the tomato fruit fly, Neoceratitis cyanescens, to colored fruit models

Brévault

Quilici

2007

Entomologia Exp Applicata

View full text Add to dashboard Cite

To determine how mature females of the tomato fruit fly, Neoceratitis cyanescens (Bezzi) (Diptera: Tephritidae), detect host fruit after arriving in their host plant habitat, behavioral responses to colored models were observed in a laboratory flight chamber. Host‐seeking females oriented themselves preferentially towards bright orange spheres (3.7 cm in diameter), irrespective of their natal host fruit: tomato, bug weed, or black nightshade. Females oriented themselves preferentially towards the orange sphere when placed against a fluorescent yellow background as opposed to a black background, but the distribution of responses to the set of colored spheres did not vary significantly with background color. In a choice situation between bright orange spheres of various sizes (1.9, 3.7, and 7.5 cm in diameter), females landed preferentially on the bigger sphere. However, they preferred a yellow color when the latter was associated with two‐dimensional models, probably mimicking leaves. The attractiveness of orange spheres depended more on the proportion of reflected light in the spectral region around 610 nm than brightness of color in itself. Low light intensity significantly influenced the activity of the flies but not their visual preference. The strong response of females to bright orange spheres confirmed the importance of visual characteristics in short‐range mechanisms of host‐plant location in specialist insects. Responses to fruit visual stimuli are discussed relative to other Tephritidae, host‐finding strategy, and pest management.

show abstract

“…Some slight yellowing was observed for the UV-treated samples. The Hunter whiteness indices [10] of the untreated and treated wool sample (60 min treatment time) were 77.95 and 76.52, respectively.…”

Section: Pretreatment With Uv Radiationmentioning

confidence: 97%

Surface modification and low temperature dyeing properties of wool treated by UV radiation

Xin

Zhu

Hua

et al. 2002

Coloration Technology

View full text Add to dashboard Cite

The surface modification and dyeing properties of wool treated by UV radiation have been investigated. Wool samples were exposed to UV radiation for 60 min and the surface modification of the wool fibre was investigated by X‐ray photoelectron spectroscopy. The chemical change caused by the UV treatment was identified as surface oxidation of cystine (disulphide bonds) and thereby induced changes in the dyeing properties of the wool. The dyeability of UV‐treated and untreated wool samples was determined at temperatures of 45, 50, 55 and 60 °C using CI Acid Blue 7. The UV‐treated wool samples showed greater levels of dye uptake compared with those of the untreated samples. The adsorption behaviour and diffusion coefficients were also studied. The dyeing properties of wool were enhanced by UV radiation due to the increased diffusion coefficient of the dyes in the treated wool fibres.

show abstract

New Reflectometer and Its Use for Whiteness Measurement*

Cited by 36 publications

References 7 publications

Oviposition preference in the oligophagous tomato fruit fly, Neoceratitis cyanescens

Oviposition preference in the oligophagous tomato fruit fly, Neoceratitis cyanescens

Visual response of the tomato fruit fly, Neoceratitis cyanescens, to colored fruit models

Surface modification and low temperature dyeing properties of wool treated by UV radiation

Contact Info

Product

Resources

About