Screening of Microorganisms for Biodegradation of Simazine Pollution (Obsolete Pesticide Azotop 50 WP)

The capability of environmental microorganisms to biodegrade simazine—an active substance of 2-chloro-s-triazine herbicides (pesticide waste since 2007)—was assessed. An enormous metabolic potential of microorganisms impels to explore the possibilities of using them as an alternative way for thermal and chemical methods of utilization. First, the biotope rich in microorganisms resistant to simazine was examined. Only the higher dose of simazine (100 mg/l) had an actual influence on quantity of bacteria and environmental fungi incubated on substrate with simazine. Most simazine-resistant bacteria populated activated sludge and biohumus (vermicompost); the biggest strain of resistant fungi was found in floral soil and risosphere soil of maize. Compost and biohumus were the sources of microorganisms which biodegraded simazine, though either of them was the dominant considering the quantity of simazine-resistant microorganisms. In both cases of periodic culture (microorganisms from biohumus and compost), nearly 100% of simazine (50 mg/l) was degraded (within 8 days). After the repeated enrichment culture with simazine, the rate of its degradation highly accelerated, and just after 24 h, the significant decrease of simazine (20% in compost and 80% in biohumus) was noted. Although a dozen attempts of isolating various strains responsible for biodegradation of simazine from compost and biohumus were performed, only the strain identified as Arthrobacter urefaciens (NC) was obtained, and it biodegraded simazine with almost 100% efficiency (within 4 days)

Developing immunity to flight security risk: prospective benefits from considering aviation security as a socio-technical eco-system

Since 9/11, preventing similar terrorist disasters has been the predominant goal of aviation security. Yet, in this paper we seek to explore why it is that despite our increased knowledge of disaster causation - aviation security systems still remain vulnerable to future exploitation by adaptive terrorists and other threat groups. We adopt a novel approach, and present early directions of how we apply the benefits of high level appreciations of socio-technical and biological eco-systems to existing complex aviation transportation security systems. We propose that by approaching aviation security as a complex socio-technical eco-system, it offers an opportunity to think beyond conventional methodologies to improve system performance in a way that, hitherto, would not have been possible. The paper concerns itself with the ability for aviation socio-technical eco-systems to hold the capacity to proactively identify and mitigate pathogenic errors and violations. This narrow view is juxtaposed with identifying methods of reducing error creation ‘before’ they become system vulnerabilities. To address this problem, the paper concludes that a fresh approach, both conceptually and operationally, is required to understand that ‘true’ foresight of latent vulnerabilities can only be achieved by a system which is ‘intelligent’ and ‘self-aware’, in other words to identify and modify hostile pathogens before they are exploited. The development of true foresight in aviation security systems is critical to the prevention of future terrorist attacks