Anastasios Varkoulis

7 Questions 1 Answers 0 Followers

Questions related from Anastasios Varkoulis

Hierarchical cluster between groups?

I have observations of 4 species and want to see the similarities using clustering method. I get a dendrogram containing all observations showing species A in cluster 1,species B and C in cluster...

15 July 2022 617 3 View

Is there a methodology of Holothuria dissection?

I don't seem to be able to find any complete and fully-featured methodology for dissection of holothuria in order to be able to isolate organs and tissues efficiently. I actually would also like...

09 November 2019 6,601 1 View

Can I simulate effects of ocean acidification on shells of marine invertebrates using methods other than CO2 bubbling?

Is there a way to reduce pH of seawater to assess the dissolution of exoskeletons of marine invertebrates of dead organisms(e.g. shell of mussels). In other words can I for instance use HCl to...

26 March 2019 783 1 View

Can I mix powder derived from shells of different organisms from the same species and sample collection for Xrd analysis?

I need to analyse multiple samples in the form of powder using X ray diffraction. Can I mix powder derived from shells of similar organisms from the same species for qualitative and quantitative...

20 March 2019 4,754 3 View

Is there a protocol for SEM EDS analysis of shell of invertebrates using Jeol SEM (Magnitute, WD, Accelerated electrons, etc.)?

I am currently working on determining the elemental composition of shells of sea urchins. Most of the samples show relatively similar results but in some cases it is obvious that something is...

02 December 2018 3,803 3 View

Should I rather perform an XRD-analysis on CaCO3 or MgCO3 regarding the shell of sea urchins?

I would like to perform an XRD analysis on ground samples of sea urchin test. Would it be more effective to search for CaCO3 or for MgCO3 and why? Thank you in advance.

27 November 2018 2,698 1 View

Ways of maintaining constant pH of salt- or seawater?

Is there a way to maintain pH of Saltwater or even better seawater constant without using CO2 while having inserted hard tissue of sea urchin in it?

04 May 2018 5,779 2 View