ABSTRACT
This study assessed the effects of pollutants on Magallana gigas along a coastal zone with different levels of human activity: a highly impacted zone in the Bahía Blanca Estuary and a less impacted zone on the adjacent sandy beaches. Oysters collected in 2021 were analyzed for various factors, including metals, polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides, microplastics, oxidative stress and histology. Oysters of both environments exhibited detectable concentrations of all these pollutants in their tissues. However, the estuarine oysters showed higher concentrations of Zn, Cu and As and total PAHs than the beach oysters. Banned organochlorine pesticides were detected only in beach oysters. Estuarine oysters displayed morphological changes in their digestive gland including a reduction in the mean epithelial thickness of the tubule and elevated lipid peroxidation levels, indicating cellular damage. This study underscores the widespread presence of pollutants in M. gigas, indicating the need for effective strategies to safeguard coastal ecosystem health.
ABSTRACT
La goma xantano es utilizada en la industria hidrocarburífera para la extracción terciaria del petróleo. En su utilización en la cuenca del Golfo San Jorge, se observaron inconvenientes con la perdida de estructura del gel que se forma. Se buscó el agente causal de la perdida de estructura del gel. Se aisló e identifico a Bacillus pumilus como la bacteria capaz de crecer utilizando la goma xantano como única fuente de carbono y energía, modificando la viscosidad del gel y así cambiando sus propiedades
Xanthan gum is used in the oil industry for the tertiary extraction of petroleum. In its use in the basin of the Gulf of San Jorge, there were problems with the loss of gum structure. Strain identified by Bacillus pumilus was isolated from oil water industry and was grown in the medium with xanthan as carbon source. This change modifies the viscosity of the gum and thus changing its properties
