Blood Transfusion Blood transfusion is something very common and this simple operation is performed in every hospital. Carl Landsteiner was the first scientist to discover that special antigens can be found on the surface of some antibodies in the plasma and erythrocytes.
Blood Clotting: The process of blood clotting has several stages: 1- Blood platelets are ruptured by the injury. 2- They release thromboplastin. 3- Thromboplastin turns prothrombin in thrombin. 4- Thrombin converts the liquid fibrinogen in solid fibrin fibres which create a web at the wound. 5. The blood cells caught in the web form a […]
Alloy is a solid solution made by mixing two more metals or nonmetals and metals. Alloy is usually made by melting and mixing the materials and letting them cool down at a normal temperature. Alloys are prepared in order to give a material certain desired properties.
1- Soda (Soft) Glass This is the most ordinary type of glass and it is often called soft glass. This type of glass is made by melting sand, quick lime and soda ash. This type of glass is used to make dishes, bottles, tumblers, mirrors, light bulbs, windows, etc.
The earth’s atmosphere is a strange and miraculous layer which is the main reason for many of the beautiful landscapes we can see from earth. We won’t be exaggerating if we say that the sky is probably one of the most beautiful things you can observe from earth without any special equipment. In most cases […]
When you were a child, you have probably heard that camels use their humps to store water. However, this isn’t entirely true. The hump is in fact a mound of fat which can weigh up to 35 kilograms. Humans and just about all types of animals store their fat in their muscle tissue and beneath […]
Every one of us has seen manholes – these are the round openings which connect the sewerage pipes of our city or village. However they serve a much higher purpose – manholes are used as an entry point for pipe cleaning. Each manhole is covered with a round cover in order to prevent accidents.
An Astronomical telescope is utilized for the observation of heavenly objects that are at great distance in relation to the earth. These include stars and planets. Due to the great distance, they appear very small in size and nearer to each other.
Why Do Stars Twinkle? Because of the difference in densities among the layers of atmosphere, the density of the atmosphere as a whole is not consistent. The layer at a higher altitude is less cold and denser than the layer present at a lower altitude. Because of this as we go upwards, the refractive index […]
A large number of bacteria or fungi frequently use the process of spore formation as a means of reproduction. During this process, a filamentous structure called sporangium is formed from fungal hypha. A large number of nuclei are produced when nucleus in sporangium gets divided. Each of the nucleuses then gets enclosed with cytoplasm resulting […]