Why Milk is White? How Cheese is Formed? & Jamun Trees@Parliament House: DTE 1 - 15 September 2020

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Why Milk is White? How Cheese is Formed?

  • The colloidal form depends on the pH factor or the acidity of the substance. If the pH factor is disturbed, the colloid will lose its structure. Now, milk is composed of several compounds, primarily fat, protein, and sugar. The protein in milk is normally suspended in a colloidal (colloid) solution, which means that the small protein molecules float around freely and independently. Along with the suspended fats, these floating protein molecules refract light. This is why milk is white.
  • Normally these protein molecules repel each other, allowing them to float about without clumping, but when the pH of their solution changes, they can attract one another and form clumps. This is what happens when milk curdles. When pH levels drop in milk, it turns acidic and milk protein (casein and others) molecules attract one another to form “curdles” or lumps. These lumps then float on the surface of the solution. The lumps are formed faster at warmer temperatures.
  • When we add lime juice in boiling milk, the acid present in the lime disturbs the pH level of the milk and the protein molecules begin to form large chains. These chains of protein molecules separate themselves from water molecules and form a sediment or what we call chhena or paneer. Cheese is also made through the same process and it usually involves making use of rennet, an enzyme in a cow՚s stomach, to thicken or coagulate milk.

Jamun Trees@Parliament House

  • Parliament House constructed in the 1920s and designed by architects Lutyens and Herbert Baker. Part of Lutyens՚s original design were jamun trees, planted along with several other species like banyan, Peepal and Ficus. But come 2020, there surfaced a proposal to remove hundreds of old jamun tresses from the precinct for Central Vista project. Why? According to the union government, the average life span of jamun tree being 100 years, replacing the matured ones with new ones is the obvious solution but in reality, they can live for many more years.
  • Problem with the proposed move is that it will remove many mature trees several years before they actually die.
  • Provide nesting and roosting space for birds, squirrels, bats, and monkeys.
  • The removal of jamun trees is likely to leave a negative impact on temperature regulation, rainwater percolation, air and noise pollution reduction, dust removal and so on. All of this, apart from the loss of habitat for urban wildlife including birds and squirrels.
  • It is for this reason that the replacing fully grown trees with saplings can never be a full proof solution. Ecosystems take several decades to grow and mature and once destroyed, they never regain their former functioning.

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