RESUMO
The wide use of pesticides in agriculture expose microbiota to stressful conditions that require the development of survival strategies. The bacterial response to many pollutants has not been elucidated in detail, as well as the evolutionary processes that occur to build adapted communities. The purpose of this study was to evaluate the bacterial population structure and adaptation strategies in planktonic and biofilm communities in limited environments, as tanks containing water used for washing herbicide containers. This biodiversity, with high percentage of nonculturable microorganisms, was characterized based on habitat and abiotic parameters using molecular and bioinformatics tools. According to water and wastewater standards, the physicochemical conditions of the tank water were inadequate for survival of the identified bacteria, which had to develop survival strategies in this hostile environment. The biodiversity decreased in the transition from planktonic to biofilm samples, indicating a possible association between genetic drift and selection of individuals that survive under stressful conditions, such as heating in water and the presence of chlorine, fluorine and agrochemicals over a six-month period. The abundance of Enterobacter, Acinetobacter and Pseudomonas in biofilms from water tanks was linked to essential processes, deduced from the genes attributed to these taxonomic units, and related to biofilm formation, structure and membrane transport, quorum sensing and xenobiotic degradation. These characteristics were randomly combined and fixed in the biofilm community. Thus, communities of biofilm bacteria obtained under these environmental conditions serve as interesting models for studying herbicide biodegradation kinetics and the prospects of consortia suitable for use in bioremediation in reservoirs containing herbicide-contaminated wastewater, as biofilters containing biofilm communities capable of degrading herbicides.
RESUMO
Relata-se um caso de teratoma parasitário do omento que se originou de um tumor dermoide do ovário esquerdo. Revisão da literatura revelou 23 casos que ocorreram, na maior parte, no sexo feminino. Em alguns casos, o teratoma maduro do omento demonstrou evidência histológica de estroma ovariano, sendo associado a tumor dermoide do ovário remanescente contralateral, como neste caso. Acredita-se, então, que a autoamputação e reimplante de um tumor dermoide do ovário seja a etiologia mais comum do teratoma omental. Dor abdominal é geralmente o principal sintoma e no exame físico uma massa móvel abdominal ou pélvica é frequentemente encontrada. Tanto a ultrassonografia com doppler de fluxo em cores como a tomografia computadorizada são úteis no diagnóstico, porém a localização omental correta e exata é extremamente difícil. Teratomas maduros do omento podem ser tratados por ressecção simples. Já os teratomas imaturos, tumores potencialmente malignos, requerem tratamento adjuvante...
This is a case report of a parasitic teratoma of the omentum that derived from a dermoid tumor in the left ovary. The review of the literature pointed to 23 cases of teratoma, most of which affecting women. In some cases, as the one herein described, the mature teratoma of the omentum is followed by histologic evidence of stroma of the ovary and associated with dermoid tumor of the remaining contralateral ovary. Self-amputation and reimplantation of a dermoid tumour in the ovary is thus believed to be the most common etiology for teratoma of the omentum Abdominal pain is usually the main symptom, and mobile abdominal or pelvic mass is usually found during physical examination. Both color doppler fluximetry ultrasound and computerized tomography are useful for diagnosis purposes, but the accurate and precise localization of the omentum is of high complexity. Mature teratomas of the omentum can be treated with simple resection. I mmature teratomas, potentially malign tumors, demand adjuvant treatment...
