scholarly journals Effect of Light Intensity Level During Prelay Light Restriction on Subsequent Reproductive Performance of Turkey Breeder Hens

1992 ◽  
Vol 71 (6) ◽  
pp. 939-944 ◽  
Author(s):  
T.D. SIOPES
Keyword(s):  
Light Intensity ◽  
Reproductive Performance ◽  
Intensity Level ◽  
Breeder Hens ◽  
Effect Of Light

Effect of light intensity on ovarian gene expression, reproductive performance and body weight of rabbit does

2017 ◽  
Vol 183 ◽  
pp. 118-125
Author(s):  
Liangzhan Sun ◽  
Zhenyu Wu ◽  
Fuchang Li ◽  
Lei Liu ◽  
Jinglin Li ◽  
...  
Keyword(s):  
Gene Expression ◽  
Body Weight ◽  
Light Intensity ◽  
Reproductive Performance ◽  
Effect Of Light

scholarly journals Effect of light intensity on reproduction of Polish, Swedish, and Danish chinchillas

2005 ◽  
Vol 48 (5) ◽  
pp. 494-504 ◽  
Author(s):  
L. Felska-Błaszczyk ◽  
M. Brzozowski
Keyword(s):  
Light Intensity ◽  
Litter Size ◽  
Death Rate ◽  
Intensity Level ◽  
Genetic Groups ◽  
Reproduction Performance ◽  
Artificial Illumination ◽  
Lower Light ◽  
Offspring Mortality ◽  
Effect Of Light

Abstract. The aim of this study was to determine at what level of artificial illumination the best reproduction performance can be achieved, as well as how varied light intensity affects chinchillas of different genetic groups. Reproduction performance was evaluated for 100 Polish, 52 Swedish, and 83 Danish females. Light intensity, measured with a photoelectric light meter LS-200, ranged between 0 and 100 lx. The chinchillas were assigned to 5 groups, 20-lx interval each. The analysis included: mean litter size, mean number of weaned per litter, death rate during nursing, number of litters per female per year, as well as litter size and number of weaned per female per year. For each genetic group, the highest death rate of the young was found at the lowest light intensity level, i.e. 0-20 lx, while the lowest mortality was at 41-60 lx. Both Swedish and Danish chinchillas had lower nursing mortality at a higher level of illumination (61-100 lx), while higher mortality was recorded at lower light intensity (0-40 lx), compared to Polish chinchillas. It can be concluded that light intensity affects chinchilla reproduction, since higher litter sizes and reduced offspring mortality were observed under stronger light. Danish females attained the highest number of litters per year, the largest litter size and the highest number of weaned per year at the light intensity of 61-80 lx, compared to the other genetic groups. Chinchillas proved to be sensitive to very small changes in light intensity.

Effect of light intensity on the ultrastructure of the filamentous cyanobacterium, Anabaena variabilis

1988 ◽  
Vol 46 ◽  
pp. 300-301
Author(s):  
C. S. Bricker ◽  
S. R. Barnum ◽  
B. Huang ◽  
J. G. Jaworskl
Keyword(s):  
Fatty Acid ◽  
Light Intensity ◽  
Acid Content ◽  
Fatty Acid Content ◽  
Anabaena Variabilis ◽  
Chloroplast Envelope ◽  
Major Constituent ◽  
Filamentous Cyanobacterium ◽  
Photosynthetic Membrane ◽  
Effect Of Light

Cyanobacteria are Gram negative prokaryotes that are capable of oxygenic photosynthesis. Although there are many similarities between eukaryotes and cyanobacteria in electron transfer and phosphorylation during photosynthesis, there are two features of the photosynthetic apparatus in cyanobacteria which distinguishes them from plants. Cyanobacteria contain phycobiliproteins organized in phycobilisomes on the surface of photosynthetic membrane. Another difference is in the organization of the photosynthetic membranes. Instead of stacked thylakolds within a chloroplast envelope membrane, as seen In eukaryotes, IntracytopIasmlc membranes generally are arranged in three to six concentric layers. Environmental factors such as temperature, nutrition and light fluency can significantly affect the physiology and morphology of cells. The effect of light Intensity shifts on the ultrastructure of Internal membrane in Anabaena variabilis grown under controlled environmental conditions was examined. Since a major constituent of cyanobacterial thylakolds are lipids, the fatty acid content also was measured and correlated with uItrastructural changes. The regulation of fatty acid synthesis in cyanobacteria ultimately can be studied if the fatty acid content can be manipulated.

Effect of light intensity and water aging on surface hardness of dental resin-composites

2019 ◽  
Vol 64 (11) ◽  
pp. 1007-1014
Author(s):  
Tong XU ◽  
◽  
Jia-Hui ZHANG ◽  
Zhao-Ying LIU ◽  
Xuan LI ◽  
...  
Keyword(s):  
Light Intensity ◽  
Surface Hardness ◽  
Resin Composites ◽  
Dental Resin ◽  
Dental Resin Composites ◽  
Effect Of Light

scholarly journals Effect of Light Intensity and Quality on Growth Rate and Composition of Chlorella vulgaris

Plants ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 31 ◽  
Author(s):  
Maria N. Metsoviti ◽  
George Papapolymerou ◽  
Ioannis T. Karapanagiotidis ◽  
Nikolaos Katsoulas
Keyword(s):  
Growth Rate ◽  
Light Intensity ◽  
Chlorella Vulgaris ◽  
Lipid Content ◽  
Growth Rates ◽  
Solar Irradiance ◽  
White Led ◽  
Microalgal Biomass ◽  
Nm Range ◽  
Effect Of Light

In this research, the effect of solar irradiance on Chlorella vulgaris cultivated in open bioreactors under greenhouse conditions was investigated, as well as of ratio of light intensity in the 420–520 nm range to light in the 580–680 nm range (I420–520/I580–680) and of artificial irradiation provided by red and white LED lamps in a closed flat plate laboratory bioreactor on the growth rate and composition. The increase in solar irradiance led to faster growth rates (μexp) of C. vulgaris under both environmental conditions studied in the greenhouse (in June up to 0.33 d−1 and in September up to 0.29 d−1) and higher lipid content in microalgal biomass (in June up to 25.6% and in September up to 24.7%). In the experiments conducted in the closed bioreactor, as the ratio I420–520/I580–680 increased, the specific growth rate and the biomass, protein and lipid productivities increased as well. Additionally, the increase in light intensity with red and white LED lamps resulted in faster growth rates (the μexp increased up to 0.36 d−1) and higher lipid content (up to 22.2%), while the protein, fiber, ash and moisture content remained relatively constant. Overall, the trend in biomass, lipid, and protein productivities as a function of light intensity was similar in the two systems (greenhouse and bioreactor).

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