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Biological Methods for Microbial Control01:28

Biological Methods for Microbial Control

Biological agents offer an effective means of controlling microbial growth by leveraging natural processes like predation, competition, and the secretion of antimicrobial substances.Predatory bacteria such as Bdellovibrio species target and kill pathogens like Salmonella and E. coli. They are widely used in poultry farms to control infections. Myxococcus species help combat plant-pathogenic fungi. These naturally occurring predators serve as eco-friendly alternatives to chemical pesticides and...

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Vegetated Treatment Systems for Removing Contaminants Associated with Surface Water Toxicity in Agriculture and Urban Runoff
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Assessment of two natural marine toxins (Microcystis aeruginosa and Parasicyonis actinostoloides) for the control of

M M Nassar1

  • 1Department of Entomology, Faculty of Science, Cairo University, Egypt.

Journal of the Egyptian Society of Parasitology
|August 18, 2000
PubMed
Summary
This summary is machine-generated.

Water extracts from Microcystis aeruginosa (cyanobacteria) and Parasicyonis actinostoloides (sea anemone) show potent insecticidal activity against medical and agricultural pests. These natural compounds demonstrated significant efficacy with no observed toxicity in mice.

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Area of Science:

  • Marine Biology
  • Toxicology
  • Entomology

Background:

  • Cyanobacteria and sea anemones are sources of bioactive compounds.
  • Insect-borne diseases and agricultural pests pose significant threats.
  • Developing novel, eco-friendly insecticides is crucial.

Purpose of the Study:

  • To evaluate the insecticidal potential of Microcystis aeruginosa and Parasicyonis actinostoloides water extracts.
  • To determine the efficacy against key medical and agricultural insect larvae.
  • To assess the toxicity of these extracts on mammalian models.

Main Methods:

  • Preparation of aqueous extracts from M. aeruginosa and P. actinostoloides.
  • Bioassays conducted on larvae of Musca domestica, Culex pipiens, Spodoptera littoralis, and Agrotis ipsilon.
  • Determination of Lethal Dose 50 (LD50) values.
  • Acute and chronic toxicity tests on mice, measuring serum acetylcholinesterase (AchE) activity.

Main Results:

  • M. aeruginosa extract exhibited potent insecticidal activity with LD50 values ranging from 1.94 to 9.10 mg/ml.
  • P. actinostoloides extract showed moderate insecticidal activity with LD50 values from 19.28 to 29.4 mg/ml.
  • Neither extract demonstrated significant acute or chronic toxicity in mice, maintaining normal AchE levels.

Conclusions:

  • M. aeruginosa and P. actinostoloides extracts possess promising insecticidal properties.
  • These natural products offer a potential eco-friendly alternative for pest control.
  • Further research into the active compounds and mechanisms of action is warranted.