ARTICLE REVIEW Essay Example | Topics and Well Written Essays - 500 words

ARTICLE REVIEW - Essay Example Something must be done. The scientists who have written this article explain their idea. What they think will be most successful at solving this problem is implementing catch share programs more widely. Catch share are transferable fishing quotas that can be used at various times, often prolonging fishing seasons. In essence, fishermen own a portion of the fish stocks in any given fishery. The main point that the authors make is that putting catch share programs into effect dramatically reduces the chances that a stock will collapse. Based on the evidence they have found, they suggest it would be a good idea for more fisheries to implement this policy. The argument made by these men seems sound. They are all credible writers and their interpretation of the data makes sense. There are a few points, however, which bear critique. To begin with, what the authors are suggesting would dramatically change the way certain fisheries have been operating. By giving fishermen a private property right in the fishery, fisheries may become exclusively owned by rich corporations. There may be no way for smaller fishermen to get involved in a fishery if all the stock is privately owned by companies. Another difficult question that their policy brings up is how these rights in stocks are to be distributed.

Do silver ions kill bacteria Essay Example | Topics and Well Written Essays - 250 words

Do silver ions kill bacteria - Essay Example & Etris, S.F. 1997 p.107-114). The mechanism of inhibition performed by silver ions on bacteria was analysed using gram-positive Straphylococcus aureus and gram negative E.coli by treating with AgNO3 and was analysed using a combined X-ray microanalysis and electron microscopy. Both S.aureus and E.coli cells exhibited similar morphological changes after silver treatment. The cell wall of the bacteria detached the cytoplasm membrane and a remarkable electron-light area surfaced in the middle of the cells that contained condensed DNA molecules. Several electron dense granules were also found deposited inside the cell or surrounding the cell wall. The presence of elements of sulphur and silver in cytoplasm and electron dense granules detected by X-ray microanalysis revealed the antibacterial actions of silver. The protein became inactivated and DNA lost its ability to replicate after the treatment of silver (Feng et al 2000 p.662-668). The anti-bacterial action of silver is based on the release of silver (Ag+ ions) that act by displacing essential ions of metals such as Zn+ or Ca2+. A study by Dowling et al using anti-bacterial silver coating deposited on heat sensitive polymeric substrates deploying a combination of neutral atom beam and magnetron sputtering indicates that platinum can be used to increase the release of Ag+ ions from the silver coating. In a galvanic setting platinum exhibits enhanced activity than silver and therefore platinum enhances silver ion formation during the galvanic action. The analysis of bacterial adhesion and bactericidal reaction on coated polymers using straphylococcus epidermidis reveals that the addition of 1% platinum significantly increases the anti-bacterial effectiveness of silver coatings. For every 5 nm thick Ag/1% Platinum coatings on silicone, up to a two log reduction in bacterial adhesion is achieved that did not show cytotoxicity (Dowling et al. 2003