scholarly journals Efecto de efluentes municipales en el crecimiento y contenido de lípidos de la microalga Scenedesmus acutus en laboratorio

TAYACAJA ◽  
2020 ◽  
Vol 3 (2) ◽  
Author(s):  
Elizabeth Vásquez de la Cruz ◽  
Tatiana Zavaleta Gámez ◽  
Sorayda Mendoza Espinoza ◽  
Juan Fernando Merino Moya
Keyword(s):  
Scenedesmus Acutus

El objetivo de este estudio fue evaluar el efecto de las aguas residuales municipales (ARM) de la laguna de estabilización secundaria “Las Gaviotas”, (Nuevo Chimbote, Ancash-Perú). sobre el crecimiento poblacional y contenido de lípidos de la microalga Scenedesmus acutus. Los ensayos fueron realizados por triplicado dosificando cultivos de S. acutus con 25, 50, 75 y 100 % de ARM y un cultivo control con HM (Merino, 1999) durante siete días. Las concentraciones 50, 75 y 100 % de ARM alcanzaron mayores tasas de crecimiento (u) que el control (0,461; 0,467; 0,479 y 0,453 día-1, respectivamente) y elevados contenidos de lípidos (24,47; 23,94; 23,64 y 21,78 %), para los cultivos dosificados con 50, 75, 100% de ARM y control, respectivamente en el quinto día. El contenido de nitrógeno fue menor en los cultivos dosificados con ARM. Los cultivos de S. acutus dosificados con ARM presentaron altas tasas de crecimiento y contenido de lípidos que los controles, debido al menor contenido de nitrógeno.

Demographic responses of selected rotifers (Rotifera) and cladocerans (Cladocera) fed toxic Microcystis aeruginosa (Cyanobacteria)

2020 ◽  
Vol 193 (3) ◽  
pp. 261-274
Author(s):  
Alfredo Pérez-Morales ◽  
S.S.S. Sarma ◽  
S. Nandini ◽  
Cristian Alberto Espinosa-Rodríguez ◽  
Ligia Rivera-De la Parra
Keyword(s):  
Population Growth ◽  
Life Table ◽  
Microcystis Aeruginosa ◽  
Green Algae ◽  
Somatic Growth ◽  
Phytoplankton Species ◽  
Scenedesmus Acutus ◽  
Cladoceran Species ◽  
Toxic Cyanobacteria ◽  
Demographic Responses

Tropical waterbodies contain several species of toxic cyanobacteria including Microcystis, which adversely affect the somatic growth, survival and fecundity of zooplankton. Scenedesmus, one of the most common green algae, is even found in Microcystis -dominated waterbodies. It is, therefore possible that in natural ponds, rotifers and cladocerans feed on mixed phytoplankton species containing algae and cyanobacteria. In this work, we quantified demographic responses of three rotifer species (Brachionus calyciflorus, B. rubens, and Plationus patulus), and three cladoceran species (Simocephalus mixtus, Daphnia cf. mendotae and Moina macrocopa) fed toxic Microcystis aeruginosa only or mixed with Scenedesmus acutus. The highest population growth for both rotifer and cladoceran species was observed when Scenedesmus was offered alone or at 75 % of the diet. Daphnia cf. mendotae and B. rubens were less affected by Microcystis while M. macrocopa and B. calyciflorus were more adversely influenced, which was also corroborated by life table demography. In competition bioassays, D. cf. mendotae was more efficient, alone or in competition, when fed with 50 or 25 % of Microcystis. This work explains the dynamics of the zooplanktonic community against gradual changes in phytoplankton due to the presence of cyanobacteria.

Role of oxidative stress and thiol antioxidant enzymes in nickel toxicity and resistance in strains of the green alga Scenedesmus acutus f. alternans

2001 ◽  
Vol 47 (11) ◽  
pp. 987-993 ◽  
Author(s):  
Varinder K. Randhawa ◽  
Fengzhen Zhou ◽  
Xiaolei Jin ◽  
Czesia Nalewajko ◽  
Donn J. Kushner
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Enzymes ◽  
Green Alga ◽  
Nickel Toxicity ◽  
Scenedesmus Acutus ◽  
Thiol Antioxidant

Biological Systems to Assay Herbicidal Bleaching

1979 ◽  
Vol 34 (11) ◽  
pp. 1044-1046 ◽  
Author(s):  
Gerhard Sandmann ◽  
Karl-Josef Kunert ◽  
Peter Böger
Keyword(s):  
Graphical Method ◽  
Algal Cell ◽  
Biological Systems ◽  
High Sensitivity ◽  
Phycomyces Blakesleeanus ◽  
Dixon Plot ◽  
Physiological Conditions ◽  
Scenedesmus Acutus ◽  
Subsequent Application

Abstract Two strains of Scenedesmus acutus were found useful to study the influence of bleaching agents on either the greening process or the fully pigmented algal cell during growth. Both physiological conditions exhibit high sensitivity to bleaching herbicides. With this new assay, contrasting bleach­ing effects with the same compound can be found allowing differentiation of the herbicidal action of bleaching agents which apparently is a multifunctional one. Furthermore, the I50 can be determined rather rapidly in a simple graphical method by a Dixon plot. A subsequent application of bleaching herbicides to cultures of the fungus Phycomyces blakesleeanus rules out a possible specific action of the compounds assayed on chlorophyll or photosynthetic redox carriers. This latter assay can show whether or not the herbicides synthesis as is the case with difunon or SAN 9789.

Isolation and characterization of a Scenedesmus acutus strain to be used for bioremediation of urban wastewater

2011 ◽  
Vol 24 (3) ◽  
pp. 375-383 ◽  
Author(s):  
E. Doria ◽  
P. Longoni ◽  
L. Scibilia ◽  
N. Iazzi ◽  
R. Cella ◽  
...  
Keyword(s):  
Urban Wastewater ◽  
Scenedesmus Acutus ◽  
Isolation And Characterization

Characteristics of a Metazachlor-Resistant Scenedesmus acutus Cell Line

1995 ◽  
Vol 52 (3) ◽  
pp. 222-233 ◽  
Author(s):  
M. Couderchet ◽  
J. Rumbolz ◽  
F. Kring ◽  
P. Boger
Keyword(s):  
Cell Line ◽  
Scenedesmus Acutus
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