Data/hora: 17/06/2024 01:23:25

Provedor de dados: 	Open Marine Archive	
País: 	Belgium	
Título: 	Effects of technetium on marine micro-organisms	
Autores: 	Moureau, Z.; Jakubowski-Mania, B.; Oleski-Gebski, M.J.; Bossus, A.; Vandecasteele, C.M.; Cogneau, M.; Bonotto, S.; van der Ben, D.	
Data: 	1990	
Ano: 	1990	
Resumo: 	Eleven bacterial species have been isolated from the upper layer of intertidal sediments collected along the Belgian coast (Coxyde). Three of them (no. 1, 4 and 11) have been chosen for their halophilous character. One species has been identified as &lt;i&gt;Flavobacterium halmephilum&lt;/i&gt;, the other two are being investigated. Effects of technetium (&lt;sup&gt;99&lt;/sup&gt;Tc) have been studied on a mixed bacterial population isolated from sediments, as well as on the three halophilic species.At the concentrations utilized in this work (up to 100 microg ml&lt;sup&gt;-1&lt;/sup&gt;), &lt;sup&gt;99&lt;/sup&gt;Tc has no evident effects on bacterial growth. Uptake of technetium (&lt;sup&gt;99&lt;/sup&gt;Tc and/or &lt;sup&gt;95m&lt;/sup&gt;Tc) has been investigated in the mixed bacterial population, in the three halophilic bacteria (including &lt;i&gt;Flavobacterium halmephilum&lt;/i&gt;) and in the benthic ciliate &lt;i&gt;Uronema marinum&lt;/i&gt;. It has been found that technetium is taken up by all these micro-organisms. However, the transfer factor (TF) in bacteria may vary considerably (from 0.5 to 200), but the cause of this variability is not known and deserves further study.The ciliate &lt;i&gt;Uronema marinum&lt;/i&gt;, which feeds on living marine bacteria, was found to take up &lt;sup&gt;95m&lt;/sup&gt;Tc added to the culture medium. However, the TF in this ciliate is rather low (from 1.4 to 5.5). Because it feeds on bacteria, &lt;i&gt;Uronema marinum&lt;/i&gt; is supposed to take up technetium from water (direct contamination) as well as from contaminated bacteria (indirect contamination). Experiments with &lt;sup&gt;95m&lt;/sup&gt;Tc-labeled bacterial cells might be useful, as they could indicate which form of contamination (direct or indirect) is prevailing.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.vliz.be/imisdocs/publications/303560.pdf	
Formato: 	application/pdf	
Fonte: 	%3Ci%3EBull.+Kon.+Belg.+Inst.+Natuurwet.+Biologie+60%3C%2Fi%3E%3A+241-248	
Fonte: 	info:eu-repo/semantics/openAccess