l"alpha et l"oméga - traduzione in francese

CHEMICAL COMPOUND

L-Rhamnose; L-rhamnose; Rhamnoside; Rham; Rhamnosyl; Mannopyranosyl; Isodulcit; Alpha-L-Rhamnose; L-mannomethylose; Alpha-L-Rha; Rhamnopyranoside; Rhamnopyranose; Rhamnopyranosyl

l'alpha et l'oméga

alpha and omega, beginning and the end, first and the last (alpha is the first letter and omega the last of the Greek alphabet)

Definizione

·add. ·noun An elevated road; as, to ride on the L.

II. L ·- As a numeral, L stands for fifty in the English, as in the Latin language.

III. L ·noun A short right-angled pipe fitting, used in connecting two pipes at right angles.

IV. L ·add. ·adj Having the general shape of the (capital) letter L; as, an L beam, or L-beam.

V. L ·add. ·adj Elevated;

- a symbol for el. as an abbreviation of elevated in elevated road or railroad.

VI. L ·noun An extension at right angles to the length of a main building, giving to the ground plan a form resembling the letter L; sometimes less properly applied to a narrower, or lower, extension in the direction of the length of the main building; a wing.

VII. L ·- L is the twelfth letter of the English alphabet, and a vocal consonant. It is usually called a semivowel or liquid. Its form and value are from the Greek, through the Latin, the form of the Greek letter being from the Phoenician, and the ultimate origin prob. Egyptian. Etymologically, it is most closely related to r and u; as in pilgrim, peregrine, couch (·Fr. collocare), aubura (·Fr. ·Lat. alburnus).

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Wikipedia

Rhamnose

Rhamnose (Rha, Rham) is a naturally occurring deoxy sugar. It can be classified as either a methyl-pentose or a 6-deoxy-hexose. Rhamnose predominantly occurs in nature in its L-form as L-rhamnose (6-deoxy-L-mannose). This is unusual, since most of the naturally occurring sugars are in D-form. Exceptions are the methyl pentoses L-fucose and L-rhamnose and the pentose L-arabinose. However, examples of naturally-occurring D-rhamnose include some species of bacteria, such as Pseudomonas aeruginosa and Helicobacter pylori.

Rhamnose can be isolated from Buckthorn (Rhamnus), poison sumac, and plants in the genus Uncaria. Rhamnose is also produced by microalgae belonging to class Bacillariophyceae (diatoms).

Rhamnose is commonly bound to other sugars in nature. It is a common glycone component of glycosides from many plants. Rhamnose is also a component of the outer cell membrane of acid-fast bacteria in the Mycobacterium genus, which includes the organism that causes tuberculosis. Natural antibodies against L-rhamnose are present in human serum, and the majority of people seem to possess IgM, IgG or both of these types of immunoglobulins capable of binding this glycan.

An interesting particularity of rhamnose is the absence of formaldehyde production when reacted with periodates in the vicinal diol cleavage reaction, that makes it very useful to remove excess periodate in glycerol or other vicinal diol analysis, that would otherwise give colored blank issues.

https://en.wikipedia.org/wiki/Rhamnose