Established & Budding Experts come here and share their knowledge base and concepts with each other.
Every article submitted is reviewed by our panel.
Nickels are awarded to articles in terms of authenticity, relevance, clarity and presentation.
submitted by tejas (755 m) on 28 Oct 2008 18:24:43 IST
Interesting Facts about Food Chains This section contains a brief description of the food chains and food webs in an ecosystem.IntroductionIn an ecosystem, plants capture the sun's energy and use it to convert inorganic compounds into energy-rich organic compounds1. This process of using the sun's energy to convert minerals (such as magnesium or nitrogen) in the soil into green leaves, or carrots, or strawberries, is called photosynthesis.Photosynthesis is only the beginning of a chain of energy conversions. There are many types of animals that will eat the products of the photosynthesis process. Examples are deer eating shrub leaves, rabbits eating carr
...
submitted by tejas (755 m) on 28 Oct 2008 18:20:16 IST
Pedigree AnalysisBasic principlesIf more than one individual in a family is afflicted with a disease, it is a clue that the disease may be inherited. A doctor needs to look at the family history to determine whether the disease is indeed inherited and, if it is, to establish the mode of inheritance. This information can then be used to predict recurrence risk in future generations.A basic method for determining the pattern of inheritance of any trait (which may be a physical attribute like eye color or a serious disease like Marfan syndrome) is to look at its occurrence in several individuals within a family, spanning as many generations as possible. For a disease t
...
submitted by tejas (755 m) on 28 Oct 2008 18:04:29 IST
To understand how a pn-junction diode works, begin by imagining two separate bits of semiconductor, one n-type, the other p-type. Bring them together and join them to make one piece of semiconductor which is doped differently either side of the junction. Free electrons on the n-side and free holes on the p-side can initially wander across the junction. When a free electron meets a free hole it can 'drop into it'. So far as charge movements are concerned this means the hole and electron cancel each other and vanish.As a result, the free electrons and holes near the junction tend to eat each other, producing a region depleted of any mov
...
submitted by tejas (755 m) on 19 Oct 2008 17:18:17 IST
Chemical Kinetics Topic Concepts Experiment Reaction Rates The stopped-flow technique and its use in studying chemical reactions is described. The speed or rate of a reaction is discussed. Concentration vs time plots are recorded for reactants and product in a chemical reaction. Characteristic features for rates of change in the concentrations of reactants and product are explored. Rate of Reaction The relationships between the relative rates of change in concentration of reactants and products is discussed. The general expression for the rate of reaction is presented. The stoichiometric coefficients for a chemical equation are determined by comparing the slop
...
submitted by tejas (755 m) on 19 Oct 2008 16:40:03 IST
What is a rainbow?Author Donald Ahrens in his text Meteorology Today describes a rainbow as "one of the most spectacular light shows observed on earth". Indeed the traditional rainbow is sunlight spread out into its spectrum of colors and diverted to the eye of the observer by water droplets. The "bow" part of the word describes the fact that the rainbow is a group of nearly circular arcs of color all having a common center.Where is the sun when you see a rainbow?This is a good question to start thinking about the physical process that gives rise to a rainbow. Most people have never noticed that the sun is always behind you when you face a rainbo
...
submitted by Siddharth (0 m) on 7 Oct 2008 11:46:52 IST
MicroanatomyMuscle is mainly composed of muscle cells. Within the cells are myofibrils; myofibrils contain sarcomeres, which are composed of actin and myosin. Individual muscle fibres are surrounded by endomysium. Muscle fibers are bound together by perimysium into bundles called fascicles; the bundles are then grouped together to form muscle, which is enclosed in a sheath of epimysium. Muscle spindles are distributed throughout the muscles and provide sensory feedback information to the central nervous system.Skeletal muscle is arranged in discrete muscles, an example of which is the biceps brachii. It is connected by tendons to processes of the skeleton. Cardiac m
...
submitted by Siddharth (0 m) on 7 Oct 2008 11:46:23 IST
MicroanatomyMuscle is mainly composed of muscle cells. Within the cells are myofibrils; myofibrils contain sarcomeres, which are composed of actin and myosin. Individual muscle fibres are surrounded by endomysium. Muscle fibers are bound together by perimysium into bundles called fascicles; the bundles are then grouped together to form muscle, which is enclosed in a sheath of epimysium. Muscle spindles are distributed throughout the muscles and provide sensory feedback information to the central nervous system.Skeletal muscle is arranged in discrete muscles, an example of which is the biceps brachii. It is connected by tendons to processes of the skeleton. Cardiac m
...
views (608)
comments (0)
![[Avatar]](/templates/default/images/img/no-pic.gif)
