Chemical reactions occur when atoms, molecules, and ions interact with one other to form new substances. Chemical bonds are broken and new bonds are formed. Chemical bonds between atoms follow rules based on patterns of electron distribution within t Continue Reading...
living things are characterized by the following seven characteristics namely mobility, respiration, excretion, sensitivity or response to external stimulus, growth, feeding, and reproduction. Though there may be variations between animal and plant Continue Reading...
The Golgi receives new proteins and lipids from the ER, finishes them up, addresses them and sends them to their final destination. In this way, the Golgi could be the postal service of the city. Lysosomes get rid of unusable waste within the cell a Continue Reading...
Collision Model: Explanation and Application The Collision Model is the theory that chemical reactions are the result of collisions between molecules. These molecular collisions must be strong enough to break bonds in the reacting substances. Breaki Continue Reading...
There are about 6 billion nucleotide letters of a particular sequence in a human cell. The full set is known as the genome. DNA information is found in units called genes. One gene codes roughly for one protein. The proteins perform most of the func Continue Reading...
The energy it stores (?180 Wh kg?1) at an average voltage of 3.8 V is only a factor of 5 higher than that stored by the much older lead -- acid batteries. This may seem poor in the light of Moore's law in electronics (according to which memory capac Continue Reading...
or, to put it another way, "chemistry carried out with the primary object of investigating the workings of nature is what we now call physical chemistry" (Laidler, 5). This has made the distinction between physics and chemistry at this frontier very Continue Reading...
From a materials development perspective, this is the important part: "The significance of this advance is this: if a material as expensive and rare as a diamond can be turned into a 'commodity,' then the applications of a variety of other materials Continue Reading...
Eternal Circle of Time Electrons circle the nucleus of an atom. Untold trillions of atoms collide together and explode. The universe expands. Electrons race down the copper wires of an electric cable. The sun shines. Leaves digest the sunlight, pro Continue Reading...
Noncoding DNA, also known as "junk DNA" describes portions of the DNA sequence that do not appear to have any presentable use -- they do not encode for proteins, etc. In fact, in a most eukaryote cells, a rather large percentage of the total genome Continue Reading...
Muscular System Function of action potentials? The function of action potentials is to rapidly communicate information within a neuron, coupling the neurons "input," either synaptic, sensory or intrinsic stimulation with its output, neurotransmitte Continue Reading...
This means that all of the stars in the universe must be moving away from Earth. If all of the stars are moving away, the Universe itself must be expanding. It was this discovery of the Doppler Effect in star light that led to the Big Bang Theory. ( Continue Reading...
Nutrition-Health-Science The Digestive System Mechanical digestion begins the process of digestion. Otherwise known as chewing, it "involves mixing, grinding, or crushing large pieces of food into small pieces" (Lab: Mechanical and chemical digesti Continue Reading...
Amidation of Peptides in Humans Modern biotechnology has experienced dramatic leaps in the body of knowledge concerning molecular processes in peptides and how they work. Many of these processes rely on amidation of peptides to achieve increasingly Continue Reading...
Chocolate: Behind Its Bad Rap In today's society, chocolate is everywhere. It seems that people have developed a love-hate relationship with chocolate. According to the U.S. Department of Commerce, in 1997, the average American ate 11.7 pounds of ch Continue Reading...
"The initial response to acute inflammation includes a rapid drop in numbers of circulating eosinophils, a rapid accumulation of eosinophils at the periphery of the inflammation site and an inhibition of egress of eosinophils from the bone marrow" ( Continue Reading...
For the temperature portion of the investigation (conducted first), eight test tubes were placed in four temperature controlled water baths ranging from water and crushed ice (2( C) to near boiling (98(). The other baths were kept at room temperatur Continue Reading...
Nuclear Fuel Cycle is a set of different processes that utilize nuclear materials and then returns them to their initial state, in a cyclical manner. It begins with the mining of naturally occurring nuclear materials from the environment, and ends w Continue Reading...
