hexagonal close packed unit cell

In two-dimensional packing, hexagonal close packing is more efficient. In three dimensions the second layer spheres are placed in the A voids and B voids are unoccupied. In the second layer there are C and D voids. The third layer is placed such that it cove..

Discovery of the Cell - The history of the discovery of cells dates back to the 17 t h century and is closely associated with the history of the invention of microscopes. An Italian microscopist Marcello Malpighi studied the structure of some plants and proposed the id..

Hexagonal close packing is the most efficient two dimensional close packing. Let us now consider a three dimensional packing keeping a hexagonal close packed pattern for layers. Two types of arrangements are ..

The history of the discovery of cells dates back to the 17 th century and is closely associated with the history of the invention of microscopes. An Italian microscopist Marcello Malpighi studied the structure of some plants and proposed the idea that plants are composed ..

a) Square close packing - Particles when placed in the adjacent rows show a horizontal as well as vertical alignment and form squares. b) Hexagonal close packing - Packing in every next row are placed in the depression between the particl..

Hold a bottle cork in one hand firmly and cut a thin slice with the help of a blade. Place the section in a drop of water on a glass slide and observe under a microscope. You will find cells, which are box-like and closely packed together. Cork cells..

0.5 kg of cotton occupies more space than 0.5 kg of iron. The particles of iron are closely packed while that of cotton are loosely packed. The amount of iron packed in a unit volume is more. This explains as to why iron is heavier than the same vol..

. These cells are called sporogenous cells . These sporogenous cells undergo a few mitotic divisions to increase their number and form the microspore mother cells or microsporocytes . The microsporocytes are diploid and usually closely packed..

In bacteria, which being prokaryotic organisms, the entire hereditary material is packed into a single, irregularly folded compact mass called nucleoid or genophore or bacterial chromosome. It is short and simple consisting of a single DNA molecule. The DNA is in the form of a double heli..

A simple triangular void in a crystal is surrounded by four spheres. fig 2.11 - A unit cell of simple cubic packing fig 2.11 - (a) Tetrahedral vo..