the rom on - tifr hyderabad · the rom on science education group tifr centre for interdisciplinary...
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The r o m o n
Science Education GroupTIFR Centre for Interdisciplinary Sciences
Gopanpally, Hyderabad1
Vigyanotsav 2019University of Hyderabad, 9 February, 2019
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Sci in y a l
The scientific method begins with an observation that
leads to a question about the observed phenomena.
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Observing the unobservedAntonie van Leeuwenhoek (1632-1723)
Infusoria-1674 (Protozoa observed by Leeuwenhoek)
Microscopic section of ash tree wood drawn by Leeuwenhoek
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How did Leeuwenhoek do it?
Leeuwenhoek’s microscope
Source: https://en.wikipedia.org/wiki/Antonie_van_Leeuwenhoek 4
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The secret of Leeuwenhoek’s microscopeC.L. Stong (1957)
Preparing the Objective lens
Source: http://www.funsci.com/fun3_en/usph/usph.htm
Glass sphere microscope
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Today’s techniques
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A lens for 15 Rupees!!!
● Micro-scale plastic molding
● Centerless ball grinding
Source: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0098781
Optical fibre coupler Medical endoscope
Phone camera Hairpin microscope
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Two biomechanical engineers
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Manu Prakash Jim Cybulski
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Some common microscopes
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Foldscope
Dynam mini microscope
Compound microscope
Magnification: 130XCost: Rs. 120/-
Magnification: 60XCost: Rs. 549/-
Magnification: 150X-400XCost: Rs. 2000/-
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A microscope for all !!
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Foldscope session with middle school children, Ashramshala, Dhanora
Sample observation through Foldscope at Manikpur Ashramshala
TSWREIS students with their Foldscopes
TSWREIS students folding the Foldscopes during Workshop
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Students observe, draw and question
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Images / videos under Foldscope
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Garlic peel Spider Lily lower epidermis Onion peel Lower epidermis:
Birds of Paradise leaves
Cheek cells (stained with methylene blue)
Search : TIFR microcosmos
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Science in the kitchen
Are tomatoes alive?
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Are tomatoes alive?
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Tomato pulp (Pericarp) cells
Source: http://saurabhg.com/microscopy/tomato-cells-microscope/
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Are tomatoes alive?
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Image Source: https://www.gardeners.com/how-to/selecting-the-right-tomato-variety/5259.html
Image Source: https://www.researchgate.net/publication/262055762
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Observing cells on leaf surface
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Stomata
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Observing onion cells
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Tunic of onion
Inner epidermis of onion scale
Onion tunic under Foldscope
Inner peel
Outer peel
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How are onions similar to leaves?
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Outer peel of onion (Lower epidermis)
Inner peel
Outer peel
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What grows on onions?
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Spores eject out under waterConidiophore on the edge of the dry onion skin
Outer skin peeled to show the fungus
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Fungus on onions
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https://youtu.be/h8IaEGWnMzA
Cornell’s Speedy Bio
Aspergillus niger
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Spots on curry leaves
20Source: https://microcosmos.foldscope.com/?p=64059
Curry leaves with brown spots Brown spot observed under Foldscope
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What is that?
21Source: https://microcosmos.foldscope.com/?p=38117
Head Abdomen Entire body
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Patthar phool / Kalpasi
22Source: https://microcosmos.foldscope.com/?p=114384
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Water samples
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Puddle formed by Manjeera pipe leakage
Pedestal pond
Filamentous algae-Oedogonium
Rainwater pool
Moss on concrete tank
Moss and rainwater mixed in a vial
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Communicate your methods and findings
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You too can do it!
Begin with observations
Ask questions
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Connect the macro with the micro
Connect textbook facts with reality
Make sense of observations
Communicate you learning!
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You may use microscopes in your school lab
Or foldscopes
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Ways of getting Foldscopes
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From foldscope.com: classroom kit (20) + import duty -- Rs.150/-
Sponsored by Department of Biotechnology
From Flipkart or Amazon -- more expensive
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Thank you!
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Presentation by:Debashree, Ashalatha, Jayashree