What is that invading seaweed we found.... why dont you throw it away Luana!!!
The following is in you OneNote...for you to work on
The very first humans to arrive in NZ about 800 years ago brought along a few alien species, including a dog and a rat as well as some food plants. When Europeans turned up a whole lot more foreign things came along as well.... this has continued to the present day – just last week a snake was found in an imported car.
These foreign species are not part of the NZ natural environment and some of them have caused major problems.
Work in teams of 3 or 4 (max)... copy this page into the collaboration space, name it with your team members then work together to complete the tasks below
Find a picture of Kupe arriving in NZ, what are the names of the dog and the rat the early Maori brought
Make lists of:
10 invasive terrestrial (land) plants
10 invasive terrestrial (land) animals
10 marine species (plants or animals)
Choose at least two from each list and explain why it is a problem:
Land plant 1
Land plant 2
Land animal 1
Land animal 2
Marine species 1
Marine species 2
On Friday we will go searching for some of these things…..
The very first humans to arrive in NZ about 800 years ago brought along a few alien species, including a dog and a rat as well as some food plants. When Europeans turned up a whole lot more foreign things came along as well.... this has continued to the present day – just last week a snake was found in an imported car.
These foreign species are not part of the NZ natural environment and some of them have caused major problems.
Work in teams of 3 or 4 (max)... copy this page into the collaboration space, name it with your team members then work together to complete the tasks below
Find a picture of Kupe arriving in NZ, what are the names of the dog and the rat the early Maori brought
Make lists of:
10 invasive terrestrial (land) plants
10 invasive terrestrial (land) animals
10 marine species (plants or animals)
Choose at least two from each list and explain why it is a problem:
Land plant 1
Land plant 2
Land animal 1
Land animal 2
Marine species 1
Marine species 2
On Friday we will go searching for some of these things…..
These marine invaders spread around the country very quickly... use an image to explain how
We found quite a lot of Undaria growing:
what is it, how did it get here, is it a problem, could it be useful
Method for extracting alginate... maybe we could give it a go http://www.fao.org/docrep/006/y4765e/y4765e08.htm
or this:
Hi Graeme… here goes the answer to your query…
From: Donato Romanazzi
Sent: 07 June 2016 15:25
To: Cristina Armstrong <[email protected]>
Subject: RE: seaweed extracts
Really….as I’ve never extracted alginates. However, our friend/colleague Raimond Kaas from Ifremer in Nantes does it, and that’s how:
Cut the entire frond into small pieces (5cm2), rinse them with distilled water and then immerse in 0.5M H2SO4 solution for at least one night (stored at 4oC).
Rinse the algae again with distilled water to eliminate acid excess. For the extraction, soak 200g of acidified algae in 1L of 4% Na2CO3solution with continuous stirring. Algae residue are separated from sodium alginate solution by centrifugation (10000g for 10min).
Add sulphuric acid to the sodium alginate solution to pH 2 so as to form alginic acid, which precipitates forming foam. The product is then pressed through a filter cloth, heat-dryed and milled by pestle and mortar and stored at 4oC.
Hopefully it works!
Donato
We found quite a lot of Undaria growing:
what is it, how did it get here, is it a problem, could it be useful
Method for extracting alginate... maybe we could give it a go http://www.fao.org/docrep/006/y4765e/y4765e08.htm
or this:
Hi Graeme… here goes the answer to your query…
From: Donato Romanazzi
Sent: 07 June 2016 15:25
To: Cristina Armstrong <[email protected]>
Subject: RE: seaweed extracts
Really….as I’ve never extracted alginates. However, our friend/colleague Raimond Kaas from Ifremer in Nantes does it, and that’s how:
Cut the entire frond into small pieces (5cm2), rinse them with distilled water and then immerse in 0.5M H2SO4 solution for at least one night (stored at 4oC).
Rinse the algae again with distilled water to eliminate acid excess. For the extraction, soak 200g of acidified algae in 1L of 4% Na2CO3solution with continuous stirring. Algae residue are separated from sodium alginate solution by centrifugation (10000g for 10min).
Add sulphuric acid to the sodium alginate solution to pH 2 so as to form alginic acid, which precipitates forming foam. The product is then pressed through a filter cloth, heat-dryed and milled by pestle and mortar and stored at 4oC.
Hopefully it works!
Donato