# factor

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## factor,

in arithmetic, any number that divides a given number evenly, i.e., without any remainder. The factors of 12 are 1, 2, 3, 4, 6, and 12. Similarly in algebra, any one of the algebraic expressions multiplied by another to form a product is a factor of that product, e.g., a+b and ab are factors of a2b 2, since (a+b)(ab)=a2b2. In general, if r is a rootroot,
in mathematics, number or quantity r for which an equation f(r)=0 holds true, where f is some function. If f is a polynomial, r is called a root of f; for example, r=3 and r
of a polynomialpolynomial,
mathematical expression which is a finite sum, each term being a constant times a product of one or more variables raised to powers. With only one variable the general form of a polynomial is a0xn+a1x
equation f(x)=0, then (xr) is a factor of the polynomial f(x).

## factor

[′fak·tər]
(mathematics)
For an integer n, any integer which gives n when multiplied by another integer.
For a polynomial p, any polynomial which gives p when multiplied by another polynomial.
For a graph G, a spanning subgraph of G with at least one edge.
(statistics)
A quantity or a variable being studied in an experiment as a possible cause of variation.

## factor

1. Maths
a. one of two or more integers or polynomials whose product is a given integer or polynomial
b. an integer or polynomial that can be exactly divided into another integer or polynomial
2. Med any of several substances that participate in the clotting of blood
3. Law, Commerce a person who acts on another's behalf, esp one who transacts business for another
4. former name for a gene
5. Commercial law a person to whom goods are consigned for sale and who is paid a factorage
6. (in Scotland) the manager of an estate

## factor

A quantity which is multiplied by another quantity.

## factor

A number that divides evenly into another number. For example, 3 and 4 are factors of 12. See factorial and IFP.
References in periodicals archive ?
(14,15,33) Stem cell factor is produced by fibroblasts, epithelial cells, and even by mast cells themselves and appears to be important in the development, activation, and upregulation of mature mast cells and to the induction of mast cell degranulation.
"Stem cell factor is a key player" in liver regeneration, says Neil D.
In our experiment, stage X avian blastoderm cells with stem cell morphology and epitope profiles could be maintained with stem-like characteristics for a long term in vitro with the support of the DF-1 feeder and basic culture medium supplemented with only three cytokines: human basic fibroblast growth factor (hbFGF), mouse stem cell factor (mSCF), and human leukemia inhibitory factor (hLIF).
The growth factor stem cell factor, which stimulates mast cell development, was thought to be essential for the formation of mast cells.
The combination of granulocyte colony-stimulating factor and stem cell factor significantly increases the number of bone marrow-derived endothelial cells in brains of mice following cerebral ischemia.
Briefly, the harvested cells were filtered through a 40 [micro]m cell strainer, centrifuged at 3000 rpm for 7 minutes, and resuspended in complete culture medium of Dulbecco's Modified Eagle Medium (DMEM) supplemented with 10% fetal bovine serum (FBS), 1% of Pen-Strep, 100 ng/mL stem cell factor (SCF), 10 ng/mL Interleukin-6 (IL-6), and 5 ng/mL Interleukin-3 (IL-3).
Their findings point to a relationship between the cKit receptor found on mast cells and the transmembrane stem cell factor (SCF) ligand found on metastatic breast cancer cells.
c-Kit, also known as CD117, is a transmembrane receptor for a growth factor, termed stem cell factor and has an internal tyrosine component.
In 2002, Amgen granted ViaCell a non-exclusive worldwide license to Stem Cell Factor (SCF), a novel growth factor developed by Amgen, for ex vivo therapeutic uses.
Other studies by the two research groups have now determined safe doses of a newer growth-factor product, human stem cell factor, which is produced by genetically engineered bacteria.
We further investigated the roles of proliferation of epithelium and a possible stromal stem cell in induction of pulmonary PT by immunostaining for proliferating index (Ki-67) and thyroid transcription factor 1 (TTF-1) (11) and c-Kit antigen (a stem cell factor receptor/mast cell growth factor receptor).
It was found that BMMSCs secrete a wide range of different cytokines/growth factors, including interleukins: IL-6, IL-7, IL-8, IL-11, IL-12, IL-14, IL-15, leukemia inhibitory factor (LIF), granulocyte colony-stimulating factor (G-CSF), granulocyte macrophage colony-stimulating factor (GM-CSF), macrophage colony-stimulating factor (M-SCF), Flt-3 ligand (FL), and stem cell factor (SCF) [51].

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