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The two ends of a polypeptide are called the N-terminus, or amino end, and the C-terminus, or carboxyl end. [103] This polypeptide has four amino acids linked together. At the left is the N-terminus, with its amino (H 2 N) group in green. The blue C-terminus, with its carboxyl group (CO 2 H) is at the right.
This category contains a set of pages in a particular group. It should only contain individual blue symbols, as well as subcategories and lists of blue symbols. Topics related to the set or an individual blue symbol should be placed in relevant topic categories , such as Category:Symbols .
Here, is the probability of two amino acids and replacing each other in a homologous sequence, and and are the background probabilities of finding the amino acids and in any protein sequence. The factor λ {\displaystyle \lambda } is a scaling factor, set such that the matrix contains easily computable integer values.
A blue flower (German: Blaue Blume) was a central symbol of inspiration for the Romanticism movement, and remains an enduring motif in Western art today. [1] It stands for desire , love , and the metaphysical striving for the infinite and unreachable.
Usually aminomethyl groups feature tertiary amines. Often they are obtained by alkylation with Eschenmoser's salt, a source of [CH 2 =N(CH 3) 2] +. A cobalt(III) complex of aminomethyl is known in the form [Co 2 (CH 2 NH 2)](ClO4) 2. [1] Aminomethyl is the first member of a series of 1-aminoalkyl groups of the form −(CH 2 −) n NH 2. [2]
A fleuron (/ ˈ f l ʊər ɒ n,-ə n, ˈ f l ɜːr ɒ n,-ə n / [1]), also known as printers' flower, is a typographic element, or glyph, used either as a punctuation mark or as an ornament for typographic compositions. Fleurons are stylized forms of flowers or leaves; the term derives from the Old French: floron ("flower"). [2]
In the area of protein structural motifs, niches are three or four amino acid residue features in which main-chain CO groups are bridged by positively charged or δ + groups. [1] [2] [3] The δ + groups include groups with two hydrogen bond donor atoms such as NH 2 groups and water molecules.
The flowers are most commonly an intense blue colour and arranged in flowerheads (capitula) of 1.5–3 cm diameter, with a ring of a few large, spreading ray florets surrounding a central cluster of disc florets. The blue pigment is protocyanin, which in roses is red. [5] Fruits are approx. 3.5 mm long with 2–3 mm-long pappus bristles. [6]