Biology-Today.com

A-Z of unicellular parasite Plasmodium causing malaria in human

Zoology — Fri, 25 May 2012 18:28:56 +0000

• Grassi (1900) fully described the life-cycle of Plasmodium in the stomach of Anopheles. • Paroxysm results due to sufficient accumulation of haemozoin and other toxins in the human blood. • Tertian malaria is caused by P. vivax. Recurrence of fever is after every 48 hours (every third day). • In benign tertian malaria, there [...]

Biosphere and its functioning

Zoology — Wed, 16 May 2012 17:17:19 +0000

All of the ecosystems of the earth, together, form the biosphere. The biosphere is that portion of the earth within which life exists. It includes all oceans and freshwater, the lower layers of the atmosphere and the outer skin of the earth's crush—the rocks and soil of the earth's surface. Within the biosphere all of the functions [...]

What is Environmental Science

Zoology — Wed, 16 May 2012 16:48:54 +0000

Environment is the sum of substances & forces external to the organism in such a way that it affects the organism's existence. In relation to man, the environment constitutes of air, land, water, flora and fauna because these regulate the man's life. Environment is a multi-dimensional systems of complex interrelationships in a continuing state of [...]

Chromosomes in Bacteria

Zoology — Mon, 14 May 2012 10:28:09 +0000

Bacterial chromosomes are often circular but sometimes linear. Some bacteria have one chromosome, while others have more than one. Bactcrial DN A also exist as plasmids which are circular pieces of DNA that can be transmitted between bacteria. Plasmids often carry the genes for antibiotic resistance and can thus spread between different bacteria. Bacterial chromosomes [...]

What are overlapping genes?

Zoology — Tue, 24 Apr 2012 04:36:50 +0000

Most of the genes in general are discrete, non-overlapping units and do not share information with other genes. In contrast, some genes code for more than one protein or polypeptide. Such genes are called overlapping genes. Overlapping genes share some of the same sequences. These comprise of different genes whose nucleotide coding sequences overlap to some extent. The [...]

What is Selfish DNA

Zoology — Mon, 16 Apr 2012 18:49:49 +0000

The term selfish DNA refers to a section of DNA on the genome that is not expressed phenotypically. Selfish DNA is non-transcribed and non-coding; it does not contribute anything to the benefit of the organism and is selectively neutral in most cases. Hence, it is known to have two distinct properties: (i) the DNA sequence [...]

Some hormonal diseases in human

Zoology — Thu, 29 Mar 2012 04:23:49 +0000

Due to change of life style, food habit, mental anxiety and so other things hormonal regulations are being changed. Hormonal imbalance leads to several complex and incurable diseases. In this try, I am providing some terms/diseases in human being due to hormonal problems or loss of hormonal regulation which are as follows: 1. Acromegaly—Due to [...]

Basic idea about the Electron Microscope

Zoology — Sun, 25 Mar 2012 03:51:55 +0000

The most commonly used type of electron microscope in biology is called the transmission electron microscope because electrons are transmitted through the specimen to the observer. The transmission electron microscope has essentially the same design as a light microscope, but the lenses, rather than being glass, are electromagnets that bend beams of electrons. An electron [...]

Patterns of Heredity

Zoology — Thu, 22 Mar 2012 14:08:56 +0000

Genetic scientists have established that some physical characteristics, known as dominant, are more likely to be passed on to children. Characteristics that are less likely to be passed on are known as recessive. Dominant [...]

Some important facts of human body

Zoology — Fri, 02 Mar 2012 15:37:14 +0000

1. Length of Alimentary Canal— Approximately 8 metres. 2. B.M.R. (Basal Metabolic Rate) 1600 K. Cal/day. 3. Number cells in body—75 trillion 4. Longest Bone—Femur (Thigh bone) 5. Smallest Bone—Ear ossicle, stapes 6. Weight of brain—1400 gms 7. Blood volume—5-6 litres (in 70 kg body) 8. Normal B. P. 120/80 mm Hg. 9. Number of [...]