EFFECT OF LIGHT ON GEMMAE FORMATION: IN MYCENA CITRICOLOR

1967 ◽  
Vol 45 (5) ◽  
pp. 675-679 ◽  
Author(s):  
C. J. Rodrigues Jr. ◽  
D. C. Arny
Keyword(s):  
Light Intensity ◽  
Ultraviolet Light ◽  
Exposure Time ◽  
Lesion Size ◽  
Yellow Pigment ◽  
Limited Size ◽  
Maximum Production ◽  
Near Ultraviolet ◽  
Test Conditions ◽  
Effect Of Light

Maximum production of gemmae and yellow pigment by Mycena citricolor occurred under a glass filter which transmitted near ultraviolet light (310–400 mμ) and infrared. Within the limits of test conditions involving four rather broad areas of the spectrum, gemmae formation decreased as wavelength of light increased. Optimum light intensity was between 20 and 160 ft-c. At 740 ft-c the optimum daily exposure time was 6 hours. Infected leaves of Coffee arabicz in the light produced lesions of limited size and having numerous gemmae, but, in the dark, lesion size was indeterminate and no gemmae were formed.

Mycochrome system and conidial development in a nonphotoinduced isolate of Helminthosporium oryzae

1978 ◽  
Vol 56 (2) ◽  
pp. 206-208 ◽  
Author(s):  
Saburo Yamamura ◽  
Tadashi Kumagai ◽  
Yoshiharu Oda
Keyword(s):  
Ultraviolet Light ◽  
Blue Light ◽  
Near Ultraviolet ◽  
Aerial Hyphae ◽  
Conidial Development ◽  
Helminthosporium Oryzae ◽  
Effect Of Light

The effect of light on conidial development of a nonphotoinduced isolate of Helminthosporium oryzae was investigated. Near-ultraviolet light was not required for conidiophore induction, but conidial development was suppressed by blue light applied at a definite stage of conidiophore development, and the conidiophores were dedifferentiated into longer, slender aerial hyphae. Furthermore, the effect of blue light could be reversed by immediate exposure to near-ultraviolet light and the effects of these two spectral regions were alternatively reversible.Thus, it is concluded that a photosensitive system, called mycochrome, is involved in the conidial development of this fungus.

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

A novel near-ultraviolet-light excitable Eu3+-doped Sr2LaTaO6 red phosphor for white-light-emitting diodes

Optik ◽  
2021 ◽  
Vol 240 ◽  
pp. 166908
Author(s):  
Qifeng Tang ◽  
Tao Yang ◽  
Haifeng Huang ◽  
Jinqing Ao ◽  
Biyou Peng ◽  
...  
Keyword(s):  
Ultraviolet Light ◽  
White Light ◽  
Light Emitting Diodes ◽  
Red Phosphor ◽  
Light Emitting ◽  
Near Ultraviolet ◽  
White Light Emitting Diodes

Nerve autofluorescence in near-ultraviolet light markedly enhances nerve visualization in vivo

2021 ◽  
Author(s):  
Fernando Dip ◽  
Pedro Bregoli ◽  
Jorge Falco ◽  
Kevin P. White ◽  
Raúl J. Rosenthal
Keyword(s):  
Ultraviolet Light ◽  
Near Ultraviolet
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