Some Gyan on Cement ( all copy paste(civilread.com)
Cement is primarily characterized into two types:-
1Hydraulic cement
2Non-hydraulic cement.
Hydraulic cement:
The cement which hardens in the presence of water because of Hydration
This type of cement can also harden in underwater. Portland cement is the best example for hydraulic cement.
Non Hydraulic cement:
The cement which doesn’t harden underwater is called non-hydraulic cement.
This type of cement hardens when it reacts with the atmospheric carbon dioxide (carbonation). This cement is resistant to attack by chemicals after setting. Non-hydraulic cement is manufactured using non-hydraulic lime, gypsum plasters and oxychloride, which has liquid properties
What is Biotechnology( i am trying to keep it very simple)
•Biotechnology is the study and manipulation of living things or their component molecules, cells, tissues, or organs for the benefit of humans (or other animals).
Example -
1Recombinant DNA (rDNA) technology
2Polymerase Chain Reaction (PCR)
3Cloning
4Fermentation
5The creation of
(a)Insulin to treat diabetes
(b)Proteases (enzymes used to remove stains from clothing)
(C)Antibodies (for recognizing and fighting certain diseases
(D)Selective Breeding (dog breeds, flowers, fruits)
(E)Pharmaceutical drugs
•Cellular manipulation products (growing human ears on mice
just see how Biotechnology produces Hepatitis B vaccine