BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:The nanoscale structure of the Octopus ink: Sepia melanin
DTSTART;VALUE=DATE-TIME:20210322T132000Z
DTEND;VALUE=DATE-TIME:20210322T134000Z
DTSTAMP;VALUE=DATE-TIME:20260714T162515Z
UID:indico-contribution-6923@events.saip.org.za
DESCRIPTION:Speakers: Agnes Mbonyiryivuze (1African Centre of Excellence f
 or Innovative Teaching and Learning Mathematics and Science (ACEITLMS)\, U
 niversity of Rwanda-College of Education (UR-CE)\, Rwanda 2UNESCO-UNISA Af
 rica Chair in Nanosciences/Nanotechnology\, College of Graduate Studies\, 
 University of South Africa\, Pretoria-South Africa 3Nanosciences African N
 etwork (NANOAFNET)\, iThemba LABS-National Research Foundation\, Cape Town
 \, South Africa)\nSepia melanin isolated from the ink sacs of Sepia offici
 nalis\, is commonly used as standard in many research activities on melani
 n such as photobiology and photoreactivity of skin pigments. Melanins are 
 difficult to characterize because of their intractable chemical properties
  and the heterogeneity in their structural features. Melanin pigments\, in
  fact\, are composed of many different types of monomeric units that are c
 onnected through strong carbon-carbon bonds. Its high insolubility and und
 efined chemical entities are two obstacles in its complete characterizatio
 n. The morphological characterization and particle size distribution for s
 epia melanin by Scanning Electron Microscopy (SEM) on surface structure an
 d Transmission Electron Microscopy (TEM) to confirm the morphology obtaine
 d from SEM was done. Both results show that Sepia melanin is formed by man
 y aggregates agglomerated together. These aggregates are formed also by sm
 all spherical granules with different size distributions that have been de
 termined using image-J software. The small granule diameter obtained from 
 different TEM and SEM micrographs were 100-200nm. EDS reveals that C and O
  were the most abundant in sepia melanin with concentration average concen
 trations of about 57% and 24% respectively. The major compositions of sepi
 a melanin are C\, O\, Na\, Cl\, while the minor are Mg\, Ca\, K\, S and N.
  From TEM micrograph at high resolution\, it was possible to measure the d
 istance between polymers layers of sepia melanin using image-J software an
 d it was 0.323 nm = 3.23 Å.\n\nhttps://events.saip.org.za/event/213/cont
 ributions/6923/
LOCATION:Zoom Conference
URL:https://events.saip.org.za/event/213/contributions/6923/
END:VEVENT
END:VCALENDAR