Biofouling in Marine Molluscan Shellfish Aquaculture: A Survey Assessing the Business and Economic Implications of Mitigation

This article examines the socio-economic implications that the controversial sub-culture of skhothane has on the development or underdevelopment of youth at Ekurhuleni and surrounding townships. It interrogates skhothane within the post-modern expressive youth culture. In the township(s) of Ekurhuleni, skhothane is regarded not only as a controversial sub-culture but also as a lifestyle whereby young people compete in acquiring material goods with the ultimate purpose of destroying them. This practice co-exists alongside youth unemployment and underdevelopment which is exacerbated by poverty, rising unemployment and gross inequalities. The author argues that the practice of skhothane sub-culture does not only undermine the policies and programmes aimed at the socio-economic upliftment of young people, but turns the youth into materialistic consumers. In this article, young people are viewed as victims of post-modern lifestyles who are socialised under an intergenerational culture of poverty and underdevelopment. It uses primary data from selected interviews with skhothane members and general members of local communities and secondary sources from books, accredited journals and newspapers.

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MICROBES PARAMETERS OF WATER QUALITY FOR AQUACULTURE ON PARI ISLAND WATERS

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.29244/jitkt.v5i1.7769 ◽

2013 ◽

Vol 5 (1) ◽

Author(s):

Lies Indah Sutiknowati

Keyword(s):

Pathogenic Bacteria ◽

Heterotrophic Bacteria ◽

Total Coliform ◽

Total Cell ◽

Epifluorescence Microscopy ◽

Coliform Bacteria ◽

Total Density ◽

Shellfish Aquaculture ◽

Microbiological Parameters ◽

Phosphate Nitrate

The objective of this research was to evaluate waters quality in Pari island waters for aquaculture purpose based on bacteriological information conducted in Mei and September 2011. Microbiological parameters analyzed were total density of bacteria for coliforms, E.coli, pathogenic, heterotrophic, halotoleran, phosphate-nitrate-ammonia breaker, and total cells. Method to analyze coliform bacteria was filtration, identification of pathogenic bacteria using biochemical test, density analises for heterotrophic bacteria, analises for phosphate-nitrate-ammonia breaker bacteria using pour plate, and total cell using Acridine Orange Epifluorescence Microscopy. Results showed that the abundance of total coliform cell was about 1000-7000 colony forming unit (cfu)/100 ml. The abundance of heterotrophic, halotolerant, phosphate-nitrate-ammonia bacteria in seawater was (3.6-4.3)x105 cfu/ml, (1.1-1.3)x105 cfu/ml, (0.5-3.44)x103cfu/ml; and (3.6-6.7)x105 cfu/ml, (1.6-2.7)x105 cfu/ml, (0.6-5.22)x103 cfu/ml in sediment, respectively. The total cell of bacteria was (0.05-2.1)x107cells/ml. The dog-conch (Strombus turturella) and blood-clamps (Anadara granosa) can survive in Pari Island and there was a significant increase in sea grass litter with growth average of 0.67 mm/day and 0.90 mm/day. During snails and clamps growth, there were found several genus of pathogenic bacteria such as Salmonella, Vibrio, Aeromonas, Pseudomonas, Citrobacter, Proteus, Shigella, Hafnia, and Yersinia. The results showed that Pari island waters was suitable for developing shellfish aquaculture dog conch and blood clamps. Keywords: bacteria, parameter, shellfish, aquaculture.

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An innovative prone positioning system for advanced deformity and frailty in complex spine surgery

Journal of Neurosurgery Spine ◽

10.3171/2019.7.spine19161 ◽

2020 ◽

Vol 32 (2) ◽

pp. 229-234

Author(s):

Benjamin Kolb ◽

John Large ◽

Stuart Watson ◽

Glyn Smurthwaite

Keyword(s):

Ankylosing Spondylitis ◽

Three Dimensional ◽

Technical Note ◽

Positioning System ◽

Prone Positioning ◽

Economic Implications ◽

Potential Safety ◽

Chest Deformity ◽

Positioning Device ◽

Skin Quality

The authors present a technical note for a prone positioning system developed to facilitate cervical extension osteotomy for ankylosing spondylitis in the presence of severe deformity and frailty. Chin-on-chest deformity represents one of the most debilitating changes of ankylosing spondylitis. Where the chin-brow angle approaches or exceeds 90°, prone positioning becomes problematic due to the fixed position of the head. Furthermore, the challenge is compounded where physiological deconditioning leads to frailty, and the side effects of medical therapies decrease muscle mass and skin quality. Conventional prone positioning equipment is not able to cater to all patients. A versatile system was developed using a 3D reconstruction to enable a positioning simulation and verification tool. The tool was used to comprehensively plan the perioperative episode, including spatial orientation and associated equipment. Three-dimensional printing was used to manufacture a bespoke positioning device that precisely matched the contours of the patient, reducing contact pressure and risk of skin injury. The authors were able to safely facilitate surgery for a patient whose deformity and frailty may otherwise have precluded this possibility. The system has potential safety and economic implications that may be of significant utility to other institutions engaging in complex spinal surgery.

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