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International study on <i>Artemia</i> : 53. Morphological study of <i>Artemia</i> with emphasis to Old World strains: 1. Bisexual populations OMA
Triantaphyllidis, G.; Criel, G.R.J.; Abatzopoulos, T.J.; Sorgeloos, P..
A detailed morphological and allometrical study was performed with adult males and females of eleven bisexual populations of brine shrimp <i>Artemia</i> . Multivariate procedures, discriminant and cluster analysis, allowed to separate and group together populations which exhibit great genetic similarities. The eleven populations studied form four distinct groups: the <i>A. franciscana</i> group, the <i>A. tunisiana</i> group, the <i>A. urminiana</i> group and a broader group which includes Eastern Old World populations. Scanning electron microscopy revealed differences in the male genital organs of an <i>A. tunisiana</i> population by lacking a medial protuberance in the base of the penes while...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Artemia.
Ano: 1997 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2973
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International study on <i>Artemia</i>: 54. Morphological study of <i>Artemia</i> with emphasis to Old World strains: 2. Parthenogenetic populations OMA
Triantaphyllidis, G.; Criel, G.R.J.; Abatzopoulos, T.J.; Sorgeloos, P..
Eleven morphometric and one meristic character in 15 parthenogenetic <i>Artemia</i> populations have been studied by using discriminant and cluster analysis as well as scanning electron microscopy. Discriminant analysis revealed five main groups of morphological patterns: (i) the coastal Chinese populations together with a population from Kazakhstan, (ii) the inland Chinese salt lake populations, (iii) the Greek populations, (iv) one African population from Namibia and (v) a Chinese population from Xuyu (Jiangsu province). Cluster analysis was not always in agreement with discriminant analysis and these results are discussed.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Artemia.
Ano: 1997 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2975
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International study on <i>Artemia</i>: 57. Morphological and molecular characters suggest conspecificity of all bisexual European and North African <i>Artemia</i> populations OMA
Triantaphyllidis, G.; Criel, G.R.J.; Abatzopoulos, T.J.; Thomas, K.M.; Peleman, J.; Beardmore, J.A.; Sorgeloos, P..
A scanning electron microscopy (SEM) study of bisexual <i>Artemia</i> populations revealed that populations representing the species <i>A. franciscana, A. persimilis, A. urmiana, A. sinica</i> and a recently described species from Kazakhstan have a pair of spine-like outgrowths at the basal parts of their penes, whereas populations from Southern Europe and North Africa (i.e. Mediterranean populations) lack these spine-like outgrowths. Allozyme and DNA polymorphisms, detected by allozyme starch gel electrophoresis and AFLP fingerprinting, respectively, suggested conspecificity of the studied populations from the broader Mediterranean basin. Male specimens from the collection of the Natural History Museum of London (UK) of the extinct...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Artemia.
Ano: 1997 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2977
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<i>cis</i>-Canthaxanthins: unusual carotenoids in the eggs and the reproductive system of female brine shrimp <i>Artemia</i> OMA
Nelis, H.J.C.F.; Lavens, P.; Moens, L.; Sorgeloos, P.; Jonckheere, J.A.; Criel, G.R.J.; De Leenheer, A.P..
The significance of carotenoid accumulation in crustacean eggs remains obscure, particularly because neither eggs nor female animals have been found to display specific pigment patterns in relation to reproduction. We report here the first example of carotenoids found exclusively in the ovaries, the eggs, and the hemolymph, but not in the carcass of a female, reproductively active crustacean, i.e. the brine shrimp <i>Artemia</i> . These pigments are virtually absent in males and in immature animals and disappear very rapidly in growing nauplii following hatching of encysted embryos. Within the cysts, they are preferably localized in the yolk platelets. We have identified them as mono-<i>cis</i>-canthaxanthins on the basis of their...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal reproductive organs; Brine shrimp eggs; Carotenoids; Artemia.
Ano: 1984 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3269
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Moulting-hormone activity in adult <i>Artemia</i> OMA
Van Beek, E.; Criel, G.R.J.; Walgraeve, H.; De Loof, A..
The <i>Artemia</i> strain from Great Salt Lake (GSL 375) was used. Total body extracts and hemolymph of <i>Artemia</i> were purified by solvent partition and column chromatography. Moulting-hormone concentrations were then determined by a specific radioimmunoassay (RIA). Results are expressed in ng ecdysteroid activity/g fresh weight (or per ml). Initially, the RIA data on extracts of adults were highly variable. The use of a more accurate sampling technique based on the reproductive cycle of the females allowed to determine a hormone activity pattern.In females, moulting cycles alternate with vitellogenic cycles. The lowest values of ecdysone (3-6 ng ecdysone equivalents/g fresh body weight or ml hemolymph) occur during...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hormones; Moulting; Artemia.
Ano: 1987 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3209
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Selected bacterial strains protect <i>Artemia</i> spp. from the pathogenic effects of <i>Vibrio proteolyticus</i> CW8T2 OMA
Verschuere, L.; Heang, H.; Criel, G.R.J.; Sorgeloos, P.; Verstraete, W..
In this study <i>Vibrio proteolyticus</i> CW8T2 has been identified as a virulent pathogen for <i>Artemia</i> spp. Its infection route has been visualized with transmission electron microscopy. The pathogen affected microvilli and gut epithelial cells, disrupted epithelial cell junctions, and reached the body cavity, where it devastated cells and tissues. In vivo antagonism tests showed that pre-emptive colonization of the culture water with nine selected bacterial strains protected <i>Artemia</i> juveniles against the pathogenic effects. Two categories of the selected strains could be distinguished: (i) strains providing total protection, as no mortality occurred 2 days after the experimental infection with <i>V....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquatic animals; Bacteria; Biological control; Brine shrimp culture; Disease control; Infectious diseases; Microbiological analysis; Pathogenic bacteria; Artemia; Vibrio proteolyticus.
Ano: 2000 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=45
Registros recuperados: 6
Primeira ... 1 ... Última
 

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