Difference between revisions of "Team:Bordeaux/Practices"
Line 227: | Line 227: | ||
<h3 id="safety"> Safety </h3> | <h3 id="safety"> Safety </h3> | ||
<br> | <br> | ||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
<p align="justify"> To avoid confusion about the terms "biosecurity", "biosafety" and "biohazard", some people gave a definition of each of these terms. </p> | <p align="justify"> To avoid confusion about the terms "biosecurity", "biosafety" and "biohazard", some people gave a definition of each of these terms. </p> | ||
Line 253: | Line 246: | ||
<p align="justify" style="line-height: 105%"> ✵ We worked with non-toxic organisms as <i> Escherichia coli </i>(BL21) and <i> Saccharomyces cerevisiae </i>(Invsc1) but, all waste that has been in contact with bacteria was put to bacterial waste in aseptic conditions. | <p align="justify" style="line-height: 105%"> ✵ We worked with non-toxic organisms as <i> Escherichia coli </i>(BL21) and <i> Saccharomyces cerevisiae </i>(Invsc1) but, all waste that has been in contact with bacteria was put to bacterial waste in aseptic conditions. | ||
+ | <h6> Why is it safer to use Curdlan rather than copper sulfate ?</h6> | ||
+ | <p align="justify"> <b> 1. Copper Sufate </b> </p> | ||
+ | <p align="justify">Even if copper is essential for life at low doses, it is environmentally toxic at higher doses. Not being biodegradable, it spreads through rain water in soils and in river waters. It accumulates on the soils and vineyards are polluted. Its spread is facilitated by water and wind erosion. This element has been used many times to treat mildew which has resulted in it’s accumulation in the Aquitaine region. <br> | ||
+ | This compound also modifies the biosphere since it is toxic for worms and microorganisms living in the soil of the vineyards. Copper sulfate does not distinguish harmful and beneficial fungi. This disrupts for example the development of mycorrhiza fungi that live in symbiosis with the plant’s root to help the access to nutrients from the soil to the vegetal. The microfungi that decompose the material to fertilize the soil are also in danger. <br> | ||
+ | These effects are poorly seen on an area not exceeding the current authorized in organic farming, that is 4 kg of copper per hectare per year, according to AFSSA (French Agency for Food Safety). However, in terms of conventional agriculture, there is no limit for this substance. The measure reduces the damage to the biosphere but it isn’t reasonable yet : copper sulfate is tolerated but not innocent. It is therefore necessary to take more drastic measures by regarding the use of this substance. </br> | ||
+ | </p> | ||
<br> | <br> |
Revision as of 09:31, 14 September 2015