Electric charge

Today we might know an atom being the smallest piece of an element that represent an element, but you might not know the whole story. It all being in 1803, when a curious guy, known as John Dalton, who proposed an “atomic theory” with spherical solid atoms based upon measurable properties of mass. Later on Dalton introduced his belief that atoms of different elements could be universally distinguished based on their varying atomic weights. John Dalton's research not only changed the face of…

Since electrical appliances became a very important in people’s life, scientists have studied the effects of magnetic fields on human health. In a study of magnetic fields and cancer, “Animal and Cellular Evidence,”[1]. Bo Holmberg compares many studies that apply magnetic fields on mice and rats and he reports the effect of magnetic fields on skin, liver, harmonies, and DNA. He said that studies on animals were effective in proving the extent of exposure from magnetic fields enough to cause…

Key Idea I The arrangement of electrons is distributed between four orbital’s; S, P, D and F. Each orbital is a different shape and holds a different number of electrons. Orbital S is a circle and it contains two electrons and orbital P has three different shells. One shell is an infinity sign, the next is a crooked infinity sign and the last is shaped like an upright infinity sign. Each shell can hold two electrons which allow orbital P to hold six electrons, orbital D can hold ten electrons,…

Protein X has a pI of 5.9, Protein Y has a pI of 7.6, and Protein Z has a pI of 8.5. For each of the methods below, describe how you would go about purfying Protein Y from Proteins X and Z (provide a pH that you would use and why.) Anion exchange chromatography: In anion exchange chromatography negatively charged ions will bind to the column. This will leave positively charged ions flushed through the column. By picking a pH of 6.5, protein X will flush through the column while protein Y and Z…

to prevent degradation of pancreas by elevated trypsin activity. Figure 1: Structure of Trypsin-1. Retrieved from the Protein Data Bank. Figure 1: Structure of the catalytic triad. Residues D63, H107 and S200 as shown. Arrows represent the flow of charge that increases the serine’s nucleophile behaviour. James Gatenby SID:310255511 2. Examination of Sequence…

were black marks on the sides of the foil that suggested that it reflected off of the gold foil along with appearing on the other side. With this experiment disproving J.J.’s model, Ernest proposed his own idea. His idea was that all of the positive charge and all of the mass of the atom occupies a rather small volume at the direct center of the atom. Also the most volume of the atom was from the empty spaces that electrons were found in. Another person who takes place in changing the history of…

Atoms are very,very small. They couldn’t have been seen until 1981 with the invention of scanning tunneling microscopes. But the ideas go all the way back to ancient Greece. The beginning of the atom start around 450 B.C. with a Greek philosopher named Democritus. Democritus and a younger contemporary of Socrates. He was born in Abdera in 460 B.C. His teacher was Leucippus. Democritus was known as the laughing philosopher because he really understood cheerfulness. He stated that all things were…

They have a negative charge of -1 , and there so light that their weight is usually ignored .atoms are electrically neutral , this is due to the fact that the number of protons are the exactly the same as the number of electrons .electron are organised around the nucleus…

Field strength or intensity is the force which maintains the magnetic flux and produces a particular value of the flux density B at that point in a magnetic field. Therefore the flux density is the cause while the flux density (B) is the effect. The flux density can be assumed proportionally to the field intensity in a magnetic field which comes in three parts. First part is: Where U stands for the permeability of force (the measure of the degree to which the magnetic line of force can…

The SEM produces a largely magnified image by using electrons instead of light to form an image. A beam of electrons is produced at the top of the microscope by an electron gun. It consists of an electron gun to produce high energy electron beam. A magnetic condensing lens is used to condense the electron beam and a scanning coil is arranged in-between magnetic condensing lens and the sample. The electron detector (Scintillator) is used to collect the secondary electrons and can be converted…