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Polarity

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polarity
Presence of functional and/or structural differences in distinct regions of a cell or cellular component.


Apical polarity in three-dimensional culture systems: where to now?
Jamie L Inman and Mina J Bissell*
Include ...

Polarity
Nonpolar molecules diffuse faster through the lipid portion of the membranes.
Ions ...

Polarity
Most neurons can be anatomically characterized as:
Unipolar or pseudounipolar: dendrite and axon emerging from same process.
Bipolar: axon and single dendrite on opposite ends of the soma.
Multipolar: more than two dendrites: ...

[edit] Polarity
The polarity of an actin filament can be determined by decorating the microfilament with myosin "S1" fragments, creating barbed (+) and pointed (-) ends on the filament. An S1 fragment is composed of the head and neck domains of myosin II.
[edit] Actomyosin filaments ...

Polarity is one of the water properties.
Water Properties and Mineral Salts: water polarity
5. Which kind of polarity do water-soluble and fat-soluble substances respectively have?

polarity In systematics, the ordering of alternative states of a taxonomic character from ancestral to successively derived conditions in an evolutionary transformation series. In developmental biology, the tendency for the axis of an ovum to orient corresponding to the axis of the mother.

(C) Polarity
(D) Permeability
What is the name of the structure around which microtubules grow?

The polarity of auxin transport is due to the polar distribution of auxin transport protein in the cells.
Concentrated at the basal end of the cells, auxin transporters move the hormone out of the cell and into the apical end of the neighboring cell.

Changed polarity of the membrane, the action potential, results in propagation of the nerve impulse along the membrane. An action potential is a temporary reversal of the electrical potential along the membrane for a few milliseconds.

polarity
policy
pollen 1 2
pollutants
polyacrylamide
polymerase 1 2 3 4 5 6 7
polymerization
polymorphic
polymorphism 1 2 3 4
polynucleotide
polypeptide 1 2 3 4
poppy ...

The polarity of water
Water has a simple molecular structure. It is composed of one oxygen atom and two hydrogen atoms. Each hydrogen atom is covalently bonded to the oxygen via a shared pair of electrons. Oxygen also has two unshared pairs of electrons.

Due to this fact, each microfilament exhibits polarity, the two ends of the filament being distinctly different. This polarity affects the growth rate of microfilaments, one end (termed the plus end) typically assembling and disassembling faster than the other (the minus end).

Having impaired polarity; applied to a compass needle. Like mad, like a mad person; in a furious manner; as, to run like mad. To run mad. To become wild with exci 6f7 tement. To run wildly about under the influence of hydrophobia; to become affected with hydrophobia.

There were what we call "maternal coordinate" genes, "Gap genes, "Pair-Rule" genes, "segment polarity" genes, and "homeotic" genes. They basically act in that kind of hierarchical order to set a pattern of the embryo. What is happening is that the mother builds an egg.

patterning occurs progressively from the deployment of coarsely expressed gap genes to the more refined segment polarity genes (reviewed by Ingham, 1988)
bald fate arises b/c shavenbaby
veinlet contributes to the formation of denticle types 1-4 (Wiellete et al., 1999) ...

Radical changes are those that alter the polarity or volume of the residue. Here, L, I, F, M, Y, W, H, K, R, E and Q were classified as having large volumes, while Y, W, H, K, R, E, Q, T, D, N, S and C were classified as polar.

Partial charges create a polarity in the atom
There's a little bit of a difference in charge and this hydrogen atom is not always positively charged, but it's going to spend more time positively charged than negatively charged. So we talk about it having a partial positive charge.

As the action potential passes (B), the polarity is reversed. Then the outflow of K+ ions quickly restores normal polarity (C).

While injecting DNA into the nucleus of a cell, he noticed, "almost by serendipity," polarity in which the molecules lined up in the same direction. By 1977, he was able to prove that homologous recombination had generated the ordered array of newly introduced DNA molecules in the recipient cells.

What are the implications of bond polarity? We can see the consequences of bond polarity by comparing the properties of molecules with and without polar bonds.

The solvent properties of water mean that many different substances can dissolve in it because of its polarity.
3.1.6 Explain the relationship between the properties of water and its uses in living organisms as a coolant, medium for metabolic reactions and transport medium.

It is composed of phospholipids which each have a polar (hydrophillic) head and a polar (hydrophobic tail). The polarity of the phospholipids helps them self assemble into a structure where the hydrophobic tails all face inward away from the aqueous interior and exterior of the cell.

Rho factor
A protein which catalyzes transcription termination at certain sites or when an extended stretch on nontranslated, unstructured RNA is present. See Rho dependent polarity .
Ribosomal (rRNA)
An RNA molecule that forms part of the structure of a ribosome.

See also: See also: Cell, Protein, Trans, Cells, Organ

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