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  2. Cell theory - Wikipedia

    en.wikipedia.org/wiki/Cell_theory

    The central and rightmost cell are in interphase, so the entire nuclei are labeled. The cell on the left is going through mitosis and its DNA has condensed. In biology , cell theory is a scientific theory first formulated in the mid-nineteenth century, that living organisms are made up of cells , that they are the basic structural ...

  3. Optical microscope - Wikipedia

    en.wikipedia.org/wiki/Optical_microscope

    The optical microscope, also referred to as a light microscope, is a type of microscope that commonly uses visible light and a system of lenses to generate magnified images of small objects. Optical microscopes are the oldest design of microscope and were possibly invented in their present compound form in the 17th century.

  4. Microscopy - Wikipedia

    en.wikipedia.org/wiki/Microscopy

    Antonie van Leeuwenhoek (1632–1723). The field of microscopy (optical microscopy) dates back to at least the 17th-century.Earlier microscopes, single lens magnifying glasses with limited magnification, date at least as far back as the wide spread use of lenses in eyeglasses in the 13th century [2] but more advanced compound microscopes first appeared in Europe around 1620 [3] [4] The ...

  5. Cell biology - Wikipedia

    en.wikipedia.org/wiki/Cell_biology

    Cells were first seen in 17th-century Europe with the invention of the compound microscope. In 1665, Robert Hooke referred to the building blocks of all living organisms as "cells" (published in Micrographia) after looking at a piece of cork and observing a structure reminiscent of a monastic cell; [4] [5] however, the cells were dead. They ...

  6. Objective (optics) - Wikipedia

    en.wikipedia.org/wiki/Objective_(optics)

    Two Leica oil immersion microscope objective lenses; left 100×, right 40×. The objective lens of a microscope is the one at the bottom near the sample. At its simplest, it is a very high-powered magnifying glass, with very short focal length. This is brought very close to the specimen being examined so that the light from the specimen comes ...

  7. If you haven’t been car shopping in a while, brace yourself

    www.aol.com/next-car-could-cost-more-150822072.html

    Much of the reason Americans are paying nearly $50k for a car is that automakers decided to go all-in on expensive cars. The more they charge for a car, the more money they make off it.

  8. Musk, Ramaswamy visit Capitol Hill to discuss Trump's DOGE ...

    www.aol.com/news/musk-ramaswamy-visit-capitol...

    Elon Musk and Vivek Ramaswamy are expected to visit Capitol Hill Thursday morning to meet with Republican lawmakers in both chambers of Congress to discuss ways to reduce waste in the federal ...

  9. Cell (biology) - Wikipedia

    en.wikipedia.org/wiki/Cell_(biology)

    Detailed diagram of lipid bilayer of cell membrane The cell membrane , or plasma membrane, is a selectively permeable [ citation needed ] biological membrane that surrounds the cytoplasm of a cell. In animals, the plasma membrane is the outer boundary of the cell, while in plants and prokaryotes it is usually covered by a cell wall .

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