Data/hora: 23/09/2024 04:52:39

Biblioteca(s): 	Embrapa Meio Ambiente.	
Data corrente: 	20/08/2009	
Data da última atualização: 	02/06/2016	
Autoria: 	JONSSON, C. M.; PARAIBA, L. C.; AOYAMA, H.	
Afiliação: 	CLAUDIO MARTIN JONSSON, CNPMA; LOURIVAL COSTA PARAIBA, CNPMA; HIROSHI AOYAMA, UNICAMP - Instituto de Biologia.	
Título: 	Metals and linear alkylbenzene sulphonate as inhibitors of the algae Pseudokirchneriella subcapitata acid phosphatase activity.	
Ano de publicação: 	2009	
Fonte/Imprenta: 	Ecotoxicology, v.18, n.5, p.610-619, 2009.	
Idioma: 	Inglês	
Conteúdo: 	Sewage sludge applied to soils as a fertilizer often contains metals and linear alkylbenzene sulphonate (LAS) as contaminants. These pollutants can be transported to the aquatic environment where they can alter the phosphatase activity in living organisms. The acid phosphatase of algae plays important roles in metabolism such as decomposing organic phosphate into free phosphate and autophagic digestive processes. The order of in vitro inhi- bition of Pseudokirchneriella subcapitata acid phosphatase at the highest concentration tested was LAS[Hg2? = Al 3?[Se4? = Pb2?[Cd2?. A non-competitive inhibi- tion mechanism was obtained for Hg2? (Ki = 0.040 mM) and a competitive inhibition for LAS (Ki = 0.007 mM). In vivo studies with treated algae cultures showed that the inhibition of speci&#64257;c activity was observed in algae exposed during 7 days, in contrast to short term (24 h) treatments with both these chemicals. Our results suggest that the inhibition parameters in vitro did not markedly differ between the two chemicals. On the other hand, in vivo evaluations showed strong differences between both pollu- tants regarding the concentration values and the degree of response.	
Thesagro: 	Alga; Fosfatase Ácida.	
Categoria do assunto: 	W Química e Física	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/143766/1/2009AP-01.pdf	
Registro original: 	Embrapa Meio Ambiente (CNPMA)	
Exemplares: 	CNPMA - (8265-1) - UPC - AP - PP -  -  - 2009.AP001 - DIS
CNPMA - (8265-2) - UPC - AP - DD -  -  - 2009.01 - DIS