scholarly journals Effect of Light Spectrum on Stress Susceptibility and Salmonella Status of Laying Hens

2018 ◽  
Vol 17 (11) ◽  
pp. 529-535 ◽  
Author(s):  
G.S Archer ◽  
J.A. Byrd
Keyword(s):  
Laying Hens ◽  
Light Spectrum ◽  
Stress Susceptibility ◽  
Effect Of Light

scholarly journals Effect of Light on Economic Characters of Laying Hens

1977 ◽  
Vol 14 (1) ◽  
pp. 1-9
Author(s):  
Hisao YONEKURA ◽  
Yukio TORII ◽  
Moriji IKEYA ◽  
Koichi ISHIKAWA ◽  
Takeshi TANIFUJI
Keyword(s):  
Laying Hens ◽  
Effect Of Light

scholarly journals Effect of Light Spectrum on Gas Exchange, Growth and Biochemical Characteristics of Einkorn Seedlings

Agronomy ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1042 ◽  
Author(s):  
Maria Luce Bartucca ◽  
Daniele Del Buono ◽  
Eleonora Ballerini ◽  
Paolo Benincasa ◽  
Beatrice Falcinelli ◽  
...  
Keyword(s):  
Nutritional Status ◽  
Light Emitting Diode ◽  
Co2 Assimilation ◽  
Photon Flux ◽  
Photon Flux Density ◽  
Vegetable Production ◽  
Light Spectrum ◽  
Beneficial Effects ◽  
Iron And Zinc ◽  
Effect Of Light

The use of Light Emitting Diode (LED) lights in microscale vegetable production is more and more widespread. In this context, the effect of light spectrum on photosynthesis, growth, shoot yield, pigment content, and nutritional status of einkorn seedlings (Triticum monococcum L. ssp. monococcum), germinated and grown in a nutrient solution, was investigated. Plants were subjected to six different LED light treatments, all having a photon flux density (PFD) of 200 μmol m−2 s−1. Two light treatments were monochromatic (red or blue), three dichromatic (blue and red in the proportion), and one of a wider spectrum (selected as a control). All the light treatments affected the morphological, biochemical, and nutritional status of einkorn seedlings. Overall, the dichromatic treatments were the most effective in stimulating biomass production, CO2 assimilation, and evapotranspiration, as well as contents in chlorophyll a and b and carotenoids, and additionally nitrogen, phosphorous, manganese, iron, and zinc. These results are of relevance for the beneficial effects of dichromatic LED treatments in maximizing einkorn shoot yield and nutritional values, and in limiting energy consumption in indoor cultivation.

Carotenoid pigments: their possible role in protecting against photooxidation in eyes and photoreceptor cells

1982 ◽  
Vol 216 (1202) ◽  
pp. 71-85 ◽  
Keyword(s):  
Plant Tissue ◽  
Photoreceptor Cells ◽  
Cellular Damage ◽  
Carotenoid Pigments ◽  
Animal Tissues ◽  
Light Spectrum ◽  
High Exposure ◽  
Light Levels ◽  
Gain Energy ◽  
Effect Of Light

The effect of light on animal tissues is ambivalent. Light is necessary for many functions, e. g. for vision and, as in the flagellate halobacterium, to gain energy. But light is potentially dangerous: it is capable of destroying cells or their components by photooxidation, especially in the presence of sensitizing pigments such as haems and cytochromes, which are ubiquitous in aerobic cells. Several different examples are discussed to show how a compromise is achieved in animal tissues that for functional reasons receive high exposure to light. Carotenoid pigments, present in many eyes and photoreceptors, seem especially suited to protect against the deleterious effects of light because they absorb the dangerous short wavelength part of the light spectrum. In plant tissue, carotenoids are also well known to be capable of ‘quenching’ photoexcited states of sensitizing pigments and of oxygen, a function that they might have also in animal tissues. A consequence of the considerations is that whenever animal tissues are exposed to higher than usual light levels and/or oxygen pressures cellular damage might occur. Examples are discussed; strategies to circumvent the deleterious effects by photooxidation follow directly from the arguments.

scholarly journals Four Hypotheses to Explain Axillary Budbreak after Removal of Flower Shoots in a Cut-rose Crop

2013 ◽  
Vol 138 (4) ◽  
pp. 243-252 ◽  
Author(s):  
A. Maaike Wubs ◽  
Ep Heuvelink ◽  
Leo F.M. Marcelis ◽  
Robert C.O. Okello ◽  
Alisa Shlyuykova ◽  
...  
Keyword(s):  
Light Intensity ◽  
Supply And Demand ◽  
Axillary Buds ◽  
Leaf Removal ◽  
Crop Canopy ◽  
Light Spectrum ◽  
Direct Light ◽  
Correlative Inhibition ◽  
Cut Rose ◽  
Effect Of Light

When flower-bearing shoots in cut-rose (Rosa ×hybrida) are harvested (removed), a varying number of repressed axillary buds on the shoot remainder start to grow into new shoots (budbreak). Besides removing within-shoot correlative inhibition, it is hypothesized that shoot removal leads to 1) increased light intensity lower in the crop canopy; 2) changes in the light spectrum (particularly red:far-red ratio); and 3) changed source:sink ratio (i.e., the ratio between supply and demand of assimilates). As a fourth hypothesis it is proposed that the degree of budbreak on a shoot remainder is also influenced by the correlative inhibition exerted by other shoots on the plant. It is the goal of this work to determine which of these four hypotheses is most important for budbreak in a cut-rose crop. Four experiments were conducted, in which these factors were varied by leaf removal, removal of mature shoots, varying the number of young shoots, shading of the crop, and application of direct light on the buds. Increase in source:sink ratio was not consistently associated with higher budbreak. If source:sink ratio was decreased by removal of leaves or a mature shoot, budbreak showed even a tendency to increase. Budbreak was subject to correlative inhibition exerted by other shoots on the plant. Treatments where more light reached the bud (as a result of less shoots, no shading of the crop, application of local light) increased budbreak. Increased red:far-red ratio had the same result as more light reaching the bud but was often interrelated with light intensity. It was concluded that after removal of the flower-bearing shoot, among the factors tested, light intensity on the buds was an important and consistent factor explaining budbreak on the shoot remainder, whereas the effect of light spectrum should be further investigated.

scholarly journals Study of the effect of light on follicular development in laying hens

2021 ◽  
Author(s):  
Shibin Cheng ◽  
Jiaxiang Wang ◽  
Yan Wu ◽  
Peng Li ◽  
Jin Song Pi
Keyword(s):  
Laying Hens ◽  
Follicular Development ◽  
Effect Of Light

scholarly journals Effect of Light on Economic and Physiological Characters of Laying Hens ,

1963 ◽  
Vol 42 (1) ◽  
pp. 150-156 ◽  
Author(s):  
J.V. Shutze ◽  
W.E. Matson ◽  
James McGinnis
Keyword(s):  
Laying Hens ◽  
Effect Of Light ◽  
Physiological Characters

scholarly journals The effects of LED light spectrum manipulation on growth and color performance of giant gourami Osphronemus gouramy Lacepede Padang strain

2022 ◽  
Vol 21 (1) ◽  
pp. 11-21
Author(s):  
Bambang Kusmayadi Gunawan ◽  
Kukuh Nirmala ◽  
Dinar Tri Soelistyowati ◽  
Daniel Djokosetiyanto ◽  
Wildan Nurussalam
Keyword(s):  
Light Emitting Diode ◽  
Emission Spectra ◽  
Control Treatment ◽  
Light Spectrum ◽  
Light Emitting ◽  
Blue Led ◽  
Pectoral Fins ◽  
Randomized Design ◽  
Red Led ◽  
Effect Of Light

This study aimed to evaluate the effect of light spectrum on growth and color performance of giant giant gourami Padang strain. The experiment used a completely randomized design (RAL) with four light emitting diode (LED) treatments in  different emission spectra (white, red, green, and blue) at 550 Lux intensity, compared to the control treatment (light room with white tubular lamp at 50 Lux intensity). The irradiation was carried out for 12 hours of photoperiod. The fish used had the total length of 82.90±4.2 mm and body weight of 9.87 ± 0.99 g. The highest growth performance was found in blue LED treatment with the specific growth rate of  2.73 ± 0.2% and feed efficiency of 86.26 ± 2.71%. The best color performance was found in red LED treatment with the RGB ratio of 44.57 ± 0.62% in dorsal fin, 38.41 ± 1.36% in pectoral fins, and 45.33 ± 2.25% in anal fin with the chromatophore cell concentration at 1.973±58 cells/mm2.   Keywords : Osphronemus gouramy, blue LED, spectrum, chromatophore, light   ABSTRAK   Penelitian ini bertujuan untuk mengevaluasi pengaruh spektrum cahaya terhadap kinerja pertumbuhan dan warna ikan gurami strain Padang. Rancangan penelitian yang digunakan adalah rancangan acak lengkap (RAL) dengan 4 perlakuan cahaya lampu light emitting diodes (LED)  yang memiliki spektrum panjang gelombang berbeda (putih, merah, hijau dan biru) intensitas 550 Lux dan kontrol (cahaya ruang berasal dari lampu tubular putih intensitas 50 Lux). Penyinaran dilakukan selama 12 jam mengikuti fotoperiod. Ikan uji yang digunakan memiliki panjang total 82,90 ± 4,2 mm, dengan bobot 9,87 ± 0,99 g. Kinerja pertumbuhan terbaik terdapat pada perlakuan LED biru dengan laju pertumbuhan spesifik sebesar 2,73 ± 0,2% dan efisiensi pakan sebesar 86,26 ± 2,71%. Performa warna terbaik terdapat pada perlakuan LED merah dengan rasio warna merah pada RGB bagian dorsal sebesar 44,57 ± 0,62%, sirip pektoral sebesar 38,41 ± 1,36%, dan sirip anal sebesar 45,33 ±  2,25% dengan jumlah sel kromatofor sebanyak 1973 sel/mm2.   Kata kunci : Osphronemus gouramy, LED biru, spektrum, kromatofor, cahaya        

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