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Light-induced development of Artemia...

Van der Linden, Anne-Marie.

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Light-induced development of Artemia cysts.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Light-induced development of Artemia cysts./
Author:	Van der Linden, Anne-Marie.
Description:	156 p.
Notes:	Source: Dissertation Abstracts International, Volume: 51-03, Section: B, page: 1080.
Contained By:	Dissertation Abstracts International51-03B.
Subject:	Biology, General. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9020420

Light-induced development of Artemia cysts.
Van der Linden, Anne-Marie.

Light-induced development of Artemia cysts. - 156 p.

Source: Dissertation Abstracts International, Volume: 51-03, Section: B, page: 1080.

Thesis (Dr.)--Universitaire Instelling Antwerpen (Belgium), 1989.

A variable amount of commercially obtained Artemia cysts refuse to hatch as long as they are deprived from light. Upon a transient illumination of these cysts development is resumed. We investigated the mechanism underlying the light activation of these cysts. The complete sequence of events is not yet unravelled, but parts of the reaction chain are elucidated.Subjects--Topical Terms:

1018625
Biology, General.

Light-induced development of Artemia cysts.
LDR:03229nmm 2200361 4500 001 1855678
005 20040629073627.5
008 130614s1989 eng d
035 $a (UnM)AAI9020420
035 $a AAI9020420
040 $a UnM $c UnM
100 1 $a Van der Linden, Anne-Marie. $3 1943483
245 1 0 $a Light-induced development of Artemia cysts.
300 $a 156 p.
500 $a Source: Dissertation Abstracts International, Volume: 51-03, Section: B, page: 1080.
500 $a Promoter: W. Decleir.
502 $a Thesis (Dr.)--Universitaire Instelling Antwerpen (Belgium), 1989.
520 $a A variable amount of commercially obtained Artemia cysts refuse to hatch as long as they are deprived from light. Upon a transient illumination of these cysts development is resumed. We investigated the mechanism underlying the light activation of these cysts. The complete sequence of events is not yet unravelled, but parts of the reaction chain are elucidated.
520 $a Concerning the photoreceptor, the results from two action spectra suggest the involvement of a porphyrin (probably a haempigment with abs.max. 450-525-575 nm).
520 $a The primary reaction in light activation in Artemia is a photochemical, oxygen consuming process. It seems that the photoreceptor needs to be oxidized to admit proper photo-activation. H $\ sb2 $\ sb2 $ substitutes while reductantia suppress the light activation.
520 $a The involvement of signal molecules was investigated and the results indicate a possible regulatory role of cyclic nucleotides in light induced resumption of development. As well light-induced as H $\ sb2 $\ sb2 $- induced resumption of development of light-deprived embryos of Artemia is accompanied by an immediate decrease in cAMP concentration. The concentration of cGMP however remains unaltered.
520 $a Next we demonstrated that light deprived cysts are not only developmentally but also metabolically arrested. This was shown by the absence of trehalose consumption, low respiratory rates and low ATP levels in light deprived cysts. Upon illumination of these cysts, we registrated an increase in respiration a decrease in trehalose- and an increase in ATP- and glycerol concentrations.
520 $a The results of $\ sp{31} $< $ 6). Upon illumination of these cysts, the intracellular pH increases (pH 7.22) and metabolism resumes. We do not know yet whether these changes in pHi are the reason or the consequence of the metabolic transitions.
520 $a An electron microscopic study affirms the metabolic data since it reveals that light deprived cysts have round, electron dense mitochondria and no polyribosomes. Upon illumination, the mitochondria lose their circular outline and become elongated, and polyribosomes are formed.
520 $a A possible sequences of the demonstrated light induced events is proposed and the role of light as a trigger in relation to diapause and quiescence of Artemia cysts is discussed.
590 $a School code: 0314.
650 4 $a Biology, General. $3 1018625
650 4 $a Environmental Sciences. $3 676987
650 4 $a Biology, Molecular. $3 1017719
690 $a 0306
690 $a 0768
690 $a 0307
710 2 0 $a Universitaire Instelling Antwerpen (Belgium). $3 1249793
773 0 $t Dissertation Abstracts International $g 51-03B.
790 1 0 $a Decleir, W., $e advisor
790 $a 0314
791 $a Dr.
792 $a 1989
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9020420