🧬Rehya's science blog🧪

Unveiling the Invisible: The Power and Potential of Microscopes The etymology of the word microscope is that it is derived from two languages. The first being the Latin word, “microscopian”, and the second being the Greek words derived from that, “mikros” (small) and “skopein” (to look at). The first ever “microscopian” was a light microscope which was discovered by the Dutch spectacle maker, Zacharias Jasssan in the 1600s. Centuries later the first transmission electron microscope allowing scientists to see in detail, was founded in 1931 by a physicist and an electrical engineer. Later, the first scanning electron microscope, allowing us to see small specimens in 3D, was made in the 1940s. There are 3 types of microscopes, the light microscope, the transmission electron microscope and the scanning electron microscope. To begin, let us discover the main difference between the light and electron microscopes, which is the cost of light microscopes being cheaper. The electron microscopes

  A level biology - The biological importance of water By Rehya <3 Water is vital for sustaining life on earth. Water is made up of two hydrogen atoms and one oxygen atom covalently bonded together. The attraction between different water molecules is by hydrogen bonding. Through the dipolar nature (caused by the partial negative and positive charges on opposite sides), this gives water distinct characteristics which helps to sustain life on earth. Water's properties Water is important, especially in the food web because water is useful in producers, like plants. Water is hard to compress which causes the cell to be rigid. Another importance of water is the dipolar nature of water causing it to be cohesive. Cohesion is the attraction between molecules of the same type. Cohesion allows water to drag through the roots and into the stems, attracting other water molecules. Adhesion is the strong attraction between water molecules caused by water being dipolar and it is caused by