Noun1.cell theory- (biology) the theory that cells form the fundamental structural and functional units of all living organisms; proposed in 1838 by Matthias Schleiden and by Theodor Schwann cell doctrine scientific theory- a theory that explains scientific observations; "scientific theories must be ...
but rather hundreds of scholars who contributed to something that we now call the “Cell Theory”. Basically, this explained to the world what we, as living organisms, are made of. This theory was followed by many more revelations about the complexity of life on Earth that changed the entire...
Cell theory is the theory that all organisms are made up of cells. It is most accepted theory, given by Matthias Jakob Schleiden and Theodor Schwann. According to cell theory, all organisms are made up of cells. A cell is the basic structural and functional unit of living organisms, and ...
rather than in the classically described stem/progenitor hierarchy. Our data was heavily dependent on marrow populations stimulated with cytokines in in vitro cell culture. Thus, the elegant
Intestinal stem cells at the bottom of crypts fuel the rapid renewal of the different cell types that constitute a multitasking tissue. The intestinal epithelium facilitates selective uptake of nutrients while acting as a barrier for hostile luminal cont
It has been proposed that mitochondria engulfed a bacteria to become the first eukaryotic cell. True or False? The digestive system filters cellular waste out of the bloodstream. True False If the plasma membrane of an animal cell was made entirely permeable to Na+, the Na+/K+pump would con...
An in-depth IRT analysis was conducted for each country, testing different IRT assumptions (e.g., unidimensionality), comparing different IRT-models, and calculating reliabilities. Furthermore, measurement invariance analysis was conducted with the recently proposed alignment procedure. Results The graded...
This list includes β-catenin and snail (which were used to generate the search string) and two other proteins where the stability was already proposed to be regulated by GSK3 or Wnt. The remainder have still to be formally confirmed as GSK3-β-TrCP targets but illustrate the possibility ...
However, it should be noticed that the virus world concept does not necessarily require a non-cellular LUCA; the concept would survive even if LUCA was, actually, a cell. What is germane to our model is the existence of an advanced pre-cellular stage of evolution at which substantial ...
In the absence of other known risk factors, HHcy was shown to stimulate the expression of monocyte chemoattractant protein-1 (MCP-1), vascular cell adhesion molecule-1 (VCAM-1), and E-selectin. This leads to increased monocyte adhesion to the arterial endothelium, and may significantly ...