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Who Discovered Radioactivity?

Who Discovered Radioactivity?
Radioactivity has always been around since it is a natural part of the environment we have. It is said to be emitted by some of those things that we use everyday like the computer monitors and TV screens. Hospitals even use radiation for x-rays and other medical purposes. But who discovered radioactivity and made its usage possible? The Early Discovery of Radioactivity A Frenchman named Henri Becquerel is said to be the person who discovered radioactivity. In the year 1896, Becquerel got some naturally fluorescent minerals to be used in an in-depth experiment. The purpose of the experiment was to study the properties of x-rays. The properties were already discovered a year ago by Wilhelm Roentgen, and Becquerel wanted to further examine it. In the experiment, what Becquerel did first was to expose potassium uranyl sulfate to the rays of the sun believing that the energy of the sun will be absorbed by the uranium and then emit it outwards as x-rays. After exposing the potassium...

Who Discovered South Africa?

Who Discovered South Africa?
Officially recognized as the Republic of South Africa, South Africa is a country that has a coastline measuring 1,739 miles or 2,798 kilometers along the Indian Ocean and Atlantic Ocean. It is close to other countries like Swaziland, Mozambique and Zimbabwe. The other nations close to this country are Lesotho, Botswana and Namibia. Some of its most popular cities are Johannesburg, Cape Town and Pretoria. Aside from these highly interesting details, it is nice to know something about the history of this country including who discovered South Africa. The Discovery of South Africa Who discovered South Africa? A Portuguese explorer named Bartolomeu Dias discovered the southernmost part of Africa in 1487, which is known today as the Cape of Good Hope in South Africa. The purpose of that particular exploration was to locate an efficient trade route to India. Before that, it was named the Cape of Storms, which was later renamed by the King of Portugal John II to the Cape of Good Hope or Cabo...

Who Discovered Mitochondria

 Who Discovered Mitochondria
It is difficult to give one specific individual the credit for who discovered mitochondria. The entire course of development from the initial sighting to the eventual classification of the so-called power plant of the cell had a slow but steady progress, spanning over a century of research conducted by a succession of brilliant scientific minds. The history of mitochondria’s discovery began in 1857, when Swiss anatomist and physiologist Albert von Kolliker revealed the presence of granule-like structures in muscle cells. Kolliker’s claim was substantiated by other scientists at the time who had observed that the granules also appeared in other cell types. Then in 1886, a cytologist named Richard Altman employed a dye technique to identify the granules. Terming them “bioblasts,” Altman hypothesized that these organelles were the basic units of cell activity. It would be in 1898 that Carl Benda would rename the bioblast as “mitochondria,” taken from the Greek words “mitos”...

Who Discovered Stem Cells?

Who Discovered Stem Cells?
Stem cell research has long been a much-debated and highly-controversial scientific field. While there is no apparent controversy with regards to who discovered stem cells, many scientists through the years have contributed to the development of the study that it would appear difficult to credit a single person for the discovery. One would have to choose between those who first suggested their existence and those who were able to prove it. It was a Russian histologist named Alexander Maksimov who, in 1908, first put forward the existence of the stem cell (and coming up with the term himself) as part of his theory of haematopoiesis. According to Maksimov’s hypothesis, all cellular blood components were derived from haematopoietic stem cells. However, there had been no major developments in the field of stem cell research for some 60 years after Maksimov’s theory was proposed. It was in the 1960’s that Joseph Altman and Gopal Das presented scientific proof of constant stem cell activity...

Who Discovered Angina Pectoris?

Who Discovered Angina Pectoris?
Also referred simply as angina, angina pectoris is a serious medical condition that affects many people all throughout the world. Patients usually experience severe pain in the chest area, mainly due to the lack of supply of oxygen to the heart muscle. Some of its common symptoms include pallor, vomiting and nausea. It is good to learn more about this serious medical condition including who discovered angina pectoris. The Discovery of Angina Pectoris Who discovered angina pectoris? The people living in 6th century B.C. India recorded and described the concept of heart pain first as part of ayurvedic medicine, which referred to angina pectoris. It was mentioned a number of times in the Sanskrit redaction text entitled the Sushruta Samhita. Additional Facts and Other Interesting Information Aside from chest discomfort, patients suffering from angina pectoris usually experience squeezing sensation, tightness and heaviness. Likewise, pain is very much felt in other body parts like the shoulders,...