S3 E49 Cube chatShaala: Exploring new ways of Learning

Meeting URL


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Timing:5.30 pm to 9.30 pm
Webinar will be recorded and recording link will be post in the same thread after the webinar.

Looking forward to your participation.

CUBE ChatShaala on 27th December 2020
27 CUBists from 23 Centres had joined the webinar

Jorhat: Ishita Sonowal
Sonari: Susanta Tanti

Silvassa: Jeene Jimmy

Dyal Singh College: Dr P. Chitralekha

Ranchi: Manjuel Jojo
Morabadi, Ranchi: Rechel Tirkey

The Cochin College, Ernakulam: Aarcha Soman, Aishwarya Elizabeth, Ashikha Farzana
Kozhikode: Arunima
Thriprayar, Thrissur: Aswathy Suresh
Thanniam, Thrissur: Sidhy PP

South Bombay: Arunan MC
Nerul: Drishtant M Kawale
Powai: Lydia Mathew
Andheri, Mumbai: Mandar Chavan
NES Ratnam College, Mumbai: Meenakshi K
Dahanu, Palghar: Sachin Pradhan
Prabhadevi, Mumbai: Yash Sheregare

Chandigarh: Rajiv Kocchar

Kanpur: Hina Mudgal
Moradabad: Kiran Yadav

Garden High School, Kalyani: Aranyak Sarma, Koulab Mukherjee
Kolkata: Batul Pipewala, Sukriti Maity


Whiteboard screenshot from yesterday’s (27/12/2020) CUBE CHATSHAALA

Olfactory Assay
How to compare the olfaction of Native fruit flies and standard CsBz strain of Drosophila melanogaster Larvae.

We had discussed that what’s the objective to compare olfaction?..

@saswathy679 @Lydia Drosphila⁩ discovered that what could be the alternative to perform olfactory assay in cube home lab…

Right hand side drawing shows Rava plate/ olfactory which needs to calibrate?.

@saswathy679 ⁩ had very well explained how to calliberate olfactometer…
Amazing a plate can act as an instrument…

@saswathy679 discovered that olfaction can also be compared in different single line Cultures that @saswathy679 has been maintaining in her CUBE HOME LAB.

Discussion has led to understand what an olfaction? What conclusion we can make when we compare olfaction of two different single line Cultures of fruit fly…

How to make dilution?

An interesting discussion on innate immunity of zebra fish…

How to differentiate in between fertilized and unfertilzed eggs?..

What’s an egg?.
Both the kinds of egg are prone to bacterial or fungal infection, but fertilized eggs can save itself by eliminating pathogen through phagocytosis whereas unfertilzed egg fails to do this and Hence got dicomposed by bacteria…

What happens during fertilization?.how many chromosomes does an egg cell contains?.

What’s the no. Of chromosomes in Human?..
How innate immunity is different from acquired immunity?.
References shared during the cube chatshaala discussion for innate immunity in Zebra fish…

1. As early as one day after fertilization (dpf), zebrafish embryos display phagocytic activity towards
microbial infections [12] and are able to mount an innate immune response

2. Pathogen Recognition and Activation of the Innate Immune Response in Zebrafish
Michiel van der Vaart, Herman P. Spaink, and Annemarie H. Meijer

3. Herbomel P, Thisse B, Thisse C. Ontogeny and behaviour of early macrophages in the zebrafish
embryo. Development. 1999;126(17):3735–3745. [PubMed] [Google Scholar]

4. Development
1999 Sep;126(17):3735-45.

5.Ontogeny and behaviour of early macrophages in the zebrafish embryo
P Herbomel 1 , B Thisse, C Thisse

6.The haploid zebrafish genome has 25 chromosomes, most of which are difficult to distinguish. These
chromosomes contain about 1.7 X l09 base pairs of DNA, about half the mammalian genome
size.Chapter 8 The Zebrafish Genome - ScienceDirect

7.Zebrafish have 25 chromosomes and their genome consists of about 1.5 x 10 billion basepairs,
compared with mammalian genome sizes of about 3 x 10 billion basepairs. It is currently unknown how
many genes there are in the zebrafish, but it is very likely that the total number will be very close to the
one expected for mammalian genomes.


8. Zebra fish larvae develop innate immune cells within 2 days post fertilization (dpf) while the adaptive
immune system is not present until approximately 3 weeks post fertilization (10, 11), making it a
favorable model to study innate immune-dominant responses.Sep 5,

9. After fertilization, larvae survive with only the innate immune responses because adaptive immune
system is morphologically and functionally mature only after 4-6 weeks postfertilization. This temporal
separation provides a suitable system to study the vertebrate innate immune response in vivo,
independently from the adaptive immune

10. It was recently shown that zebrafish embryonic macrophages efficiently engulf E. coli bacteria from
blood- and fluid-filled cavities, while neutrophils are hardly capable of phagocytosing bacteria present in
fluids https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3395205/

In today’s session, we discussed about how we can distinguish between a fertilized egg and an unfertilized egg. And what happens after an egg is not fertilized? We established that it decomposes due to microbes which can’t affect the fertilized eggs because after fertilization, they develop an innate immune response which helps them survive such microbial attacks.
Innate (natural) immunity is so named because it is present at birth and does not have to be learned through exposure to an invader.
Innate immunity, unlike acquired immunity, has no memory of the encounters, does not remember specific foreign antigens, and does not provide any ongoing protection against future infection


Why is Zebrafish used to study immune response? !
After fertilization, larvae survive with only the innate immune responses because adaptive immune system is morphologically and functionally mature only after 4-6 weeks postfertilization.

By Ishita

The follow up questions that came forward were about @tejashri 's zebrafish
• why did the 5 fertilized eggs did not hatch into larvae?
•how do we count the number of larvae?
•what could be said about the microbial growth in the water and how it’s being avoided?