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  Class 11 Chemistry   Is entropy of universe constant? Answer:-   No, the entropy of the universe always increases in the course of every spontaneous change. It is the second law of thermodynamics. Define combined form of first and second law of thermodynamics. Answer: - In thermodynamics, the combined law of thermodynamics, also called the Gibb’s fundamental equation, is a mathematical summation of the first law of thermodynamics and the second law of thermodynamics summed into a single concise mathematical statement as dU- TdS + PdV ≤ 0 Where dU is a variation in internal energy. T is temperature, dS is variation in entropy P is pressure dV is variation in volume of a simple working body in which there is neither flows of particles out of the body nor external forces, other than gravity, acting on the body. In theoretical structure, in addition to the obvious inclusion of the first two laws, the combined law incorporates the implications of the zeroth law, via temperat...

 

  What Is Humalin ? Humulin  is the man-made insulin, which is made by the recombinant DNA by genetic engineering. Humulin  R (insulin (human recombinant)) is a hormone that is produced in the body used to treat diabetes.   A small piece of circular DNA called a plasmid is extracted from the bacteria cell or yeast. Humulin N is injected under the skin. It should not be injected into muscle or veins. Doses of insulin are measured in units. U-100 insulins, including Humulin N, contain 100 units/mL. With the Humulin N U-100 vial, it is important to use a syringe that is marked for U-100 insulin preparations.

Class 11 Chemistry     First Law Of Thermodynamics and Its Limitations. This law is given by Helmholtz and Robert Mayer. This law is also known as “Law of conservation of energy” ( law of Thermodynamics) . According to this law, “Energy can neither be created nor can be destroyed although it can be converted from one form into another form. OR “Total energy of the universe remains constant”, or “Energy of an isolated system is constant.” The internal energy of the system can be changed in two ways : By allowing the heat to flow into the system or out of the system, Called Law Of thermodynamics . By doing such work on the system or by the system. Consider a system whose internal energy is U1 Now if the system absorbs q amount of heat, then the internal energy of the system increases and becomes U1 + q If work is done on the system then its internal energy further increases and becomes U2 . Thus, U2 = U1 + q + w or U2 – U1 = q + w or ∆U = q + w The above relationship is mathem...

  Hormonal control of urine formation. Urine formation is under the control of two hormones- Aldosterone and Anti diuretic Hormone (ADH). * ANTI-DIURETIC HORMONE (ADH)- This hormone released from the posterior lobe of pituitary gland, increases the permeability of the renal tubule to water. When the blood plasma is concentrated, more ADH is secreted and more water is reabsorbed in the urinary tubules. Hence urine passed out from body is concentrated, for example in summers. When the blood plasma is diluted ,  less ADH is secreted and less water is reabsorbed in the urinary tubule. In this case , dilute urine is passed out of the body, for example in winters.                    Aldosterone - A hormone released from the adrenal cortex , influences re-absorption of sodium and potassium. This hormone regulates the amount of sodium and potassium that is to be retained in the blood and is to be excreted. Some common diseases relate...

Rh- Factor (Rhesus antigens) Landsteiner and Wiener discovered in 1940 that the surface of human RBCs contains a protein that is also found in the RBCs of Rhesus monkeys. So it was termed as Rh antigen or Rh factor . Those persons who have this factor are called Rh+ Positive and those person who have no this factor are called Rh- Negative . Both Rh-Positive and Rh-Negative persons are quite normal. The problem arises when Rh Negative blood comes in contact with Rh Positive blood either due to blood transfusion or during pregnancy. Incompatibility During Blood Transfusion The Rh Negative blood can be given safely to an Rh positive individual . When Rh positive blood is transfused into Rh negative person, the recipient forms antibodies in his/her blood. However, no complications develop after the first transfusion. In case of a second transfusion of R h positive blood to an Rh negative person, the latter's anti- Rh factors attack and destroy the donors red blood cells...