10) After all of the test tubes are prepared, they will be put into cuvettes. 11) After you have prepared the dilutions, clean the outsides of the cuvettes with a paper towel. 12) Place the blank tube (tube 0) in the spectrophotometer. Since distilled water has no color it will not absorb any light so the absorbance number would be zero and this done to test the absorbance scale on the Spectrophotometer for the purpose of having it calibrated correctly. 13) Set the spectrometer to a wavelength of 530 nanometers.
Thus, Circular dichroism measured as a function of wavelength. Optical rotation (ORD) or circular dichroism (CD) can be calculated from the other if spectral information of ORD or CD is available. CD spectra is better resolved spectrally than optical rotation
Up until then, the atom was believed to be the sole smallest particle of all matter, however, JJ Thomson made a discovery and conclusion that all matter was made up of electrical particles that were similar and even smaller than the actual atom in 1897. He originally called them corpuscles, but now are know as electrons. He discovered that in cathrode rays, the atoms in these rays contained negatively charged particles. These particles also remained constant throughout all atoms. He developed a new atom model that represented the elcontron particles but did not include positive particles.
2.5.1 Fundamental of Tellurite glass The most stable oxide of tellurite is tellurite glasses (TeO2) which introduces it as a suitable host for crystalline solids and glasses. Barady (El-Mallawany, 2002) was the first researcher who reported on tellurite oxide glasses in 1957. He noticed that the tellurium dioxide is a poor glass former, meaning that it is necessary to add a modifier to starting TeO2 powder to form the glass. 10 mol% concentration of any modifier is required to form the tellurite glass and he was the first who described the octahedral giometrical structure of tellurium dioxide glasses. In 1962, Cheremisinov and Zalomanov where the first who synthesized tellurite glass (Cheremisinov and Zlomanov, 1962).
He also proved that "Plants have life 115 years ago". In November 1895, Bose presented a public demonstration at Town Hall in Calcutta where he sent an electromagnetic wave across 75 feet, passing through walls to remotely ring a bell and to explode some gunpowder Bose is known as the father of wireless communication. He had invented the Mercury Coherer, a radio wave receiver that was used by Guglielmo Marconi to build an operational two-way radio.
He produced some periodic tables between 1864-1870.” His first table contained just 28 elements, organized by their valency (how many other atoms they can combine with). In 1868 he incorporated the transition metals in a much more developed table. This 1868 table listed the elements in order of atomic weight, with elements with the same valency arranged in vertical lines,.” But the main thing is that, he was the first person, who saw the periodic trends in the properties of elements So, we finally come to the Mendeleev and his “discovery”. After reading about other scientists it is start to be understandable, that Mendeleev didn’t open periodic table. “But his attempt that was so successful that it now forms the basis of the modern periodic table.”It happened in February of 1869.He worked on the right order when “he understood that, if he put them in order according to the increasing of atomic weight, certain types of element regularly occurred.
The alcohol or mercury thermometer that are vastly used in the medical world today would not have existed had it not been for Galileo Galilei. Galileo Galilei invented the first thermometer by using the concept of air expansion by heat and contraction by cold. Only after that, other scientists came up with a more developed and accurate thermometer. One of them being Sir Isaac Newton. Years later, Gabriel Fahrenheit invented the first reliable mercury in which its scale is still used until today.
Mendeleev is known as the man behind the creation of the modern periodic table. In 1869, he published the periodic table by arranging the elements according to their atomic weights. However, at that time not all the elements we know of today had been discovered. Mendeleev filled the periodic table with the elements and left spaces for the ones that had not been discovered yet. Using the assumption of uniformity in chemical characteristics, he was able to accurately predict the properties of the unknown elements as well.
I first started the researches in 1963-65 @ 5 to 7 years age with little instruments such as papers and pencils, water drop etc. and invented the light spot scope (Liposcope). Liposcope is a simple but wonderful instrument which functions with a natural doctrine hidden secretly in the function of the eye which can help to find out some inventions and discoveries like biolumicells, bioforecast effect etc, Liposcope is my first invention. Construction: Take one small glass/steel ball or water drop on an object and stand in sun the light. Expose the ball/drop to the sun rays.