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The Coyote and The Badger

The Coyote and The Badger

A very interesting clip just blew up the internet! If you haven’t seen this video of the coyote and the badger in your feed...
Gardnerella vaginalis

Gardnerella Vaginalis

Definition Gardnerella vaginalis is the name of a micro-aerophilic coccobacillus found in the vaginal flora. Gardnerella vaginalis does not cause bacterial vaginosis (vaginal infection) unless...
Acetic Acid

Acetic Acid

Definition Acetic acid is a mildly corrosive monocarboxylic acid. Otherwise known as ethanoic acid, methanecarboxylic acid, hydrogen acetate or ethylic acid, this organic compound is...
Amino Acids

Amino Acids

Definition Amino acids are the building blocks of polypeptides and proteins and play important roles in metabolic pathway, gene expression, and cell signal transduction regulation....
BCAA supplements: a muscle myth?

Branched Chain Amino Acids

Definition The branched-chain amino acids or BCAAs, leucine, isoleucine, and valine are three of the nine nutritionally essential amino acids. These three ingredients form a...
Sulfuric acid

Sulfuric Acid

Definition Sulfuric acid (sulphuric acid) is a corrosive mineral acid with an oily, glassy appearance that gave it its earlier name of oil of vitriol....
Bile salt action in the gut

Bile Salts

Definition Bile salts are found in bile, a secretion produced by liver cells to aid digestion. Although bile is 95% water, bile salts are its...
The salivary glands

Submandibular Gland

Definition Submandibular glands are the second-largest salivary gland type, producing around 65% of our saliva when unstimulated (at rest). Located under the jaw, the exocrine...
Metaphase I

Metaphase I

Definition The first metaphase of meisosis I encompasses the alignment of paired chromosomes along the center (metaphase plate) of a cell, ensuring that two complete...
Prophase II

Prophase II

Definition During prophase II of meiosis II, four important steps occur. These are the condensing of chromatin into chromosomes, disintegration of the nuclear envelope, migration...

Cell Theory Founder and Contributors

When it was first proposed in the early 1830s, the cell theory had two main components; the cell is the basic functional and structural unit of all living things and all living things are made of one or more cells. Credit for this theory is often given to the German scientists Theodor Schwann and Matthias Schleiden, although their fellow scientist and countryman Rudolf Virchow made significant contributions later.

There were several other people who helped lay the groundwork prior to the work of Schleiden and Schwann. Galileo Galilei’s historic invention of the microscope in 1625 was improved on by the work of Anton van Leeuwenhoek who made considerable improvements to the quality of the lenses in microscopes in 1670. But even before Leeuwenhoek’s lens improvements, the British scientist Robert Hooke had already coined the term “cell” in 1665 after looking at thin slices of cork under his microscope.

Further understanding of cells came from the work of J.H.F. Link and Karl Rudolphi who, in 1804 conducted experiments that proved cells had their own cell walls and were independent of each other. Then, in 1833 botanist Robert Brown discovered the nucleus of plant cells.

In 1855, Rudolf Virchow was recognized for his idea that became the third component of the cell theory at the time, Omnis cellula e cellula which is Latin for “cells only come from other cells.”

Theodor Schwann
The image above shows the German scientist Theodore Schwann who contributed to the first cell theory.

Matthias Jacob Schleiden
The image above shows the German scientist Matthias Schleiden who along with Theodore Schwann, developed the first cell theory.

Rudolf Virchow
The image above is that of Rudolf Virchow whose contributions to the cell theory are often overlooked in history.


  • Cell Theory. (n.d.). In Wikipedia. Retrieved September 18, 2017 from https://en.wikipedia.org/wiki/Cell_theory