Porphyra umbilicalis

Mannans, in which mannose units are linked predominantly in j8-d-(1—>4) bonds, are found in the red seaweed Porphyra umbilicalis, in the seed of the tagua palm (Phytelephas macrocarpa) in the form of massive thickening of the cell walls of the endosperm, and in the endosperm of members of the Umbelliferae and of the Compositae (e.g., lettuce seed). 

Hendriks L, de Baere R, van de Peer Y, Neefs J, Goris A, de Wachter R The evolutionary position of the rhodophyte Porphyra umbilicalis and the basidiomycete Leucosporidium scottii among other eukaryotes as deduced from complete sequences of small ribosomal subunit RNA. J Mol Evol 1991 32 167-177. 

Yeast mannan is an amorphous, homogeneous polysaccharide with a D. P. of about 500. The proposed structure of this mannan is a long chain, with radiating side-chains of one or two D-mannopyranose units. In this mannan, 2 —> 1, 3 —> 1, and 6 — 1 linkages have been found. The mannan of the seaweed Porphyra umbilicalis contains chiefly 4 —> 1 /3-d linkages, and is of the branched-chain type with about one branch for each 12 D-mannose residues. 

Drew, K.M., 1949. Conchocelis-phase in the life-history of Porphyra umbilicalis (L) Kiitz. Nature, 164 748—749. 

A. Groniger, C. Hallier, D.P. Hader (1999). Influence of UV radiation and visible light on Porphyra umbilicalis Photoinhibition and MAA concentration. J. Appl Phycol, 11,437-445. 

J. Aguilera, C. Jimenez, F.L. Figueroa, M. Lebert, D.-P. Hader (1999). Effect of ultraviolet radiation on thallus absorption and photosynthetic pigments in the red alga Porphyra umbilicalis. J. Photochem. Photobiol B Biol, 48, 75-82. 

Hernandez, I. (1 995) Analysis of the expression of alkaline phosphatase activity as a measure of phosphorus status in the red alga Porphyra umbilicalis (E.) Kutzing. Botanica Marina 39,... 

Hernandez, I., Niell, F.X. and Fernandez, J.A. (1992) Alkaline phosphatase activity in Porphyra umbilicalis(L.) Kutz mg. Journal of Experimental Marine Biology and Ecology 1 59, 1-13. 

Porphyra linearis (Bangiaceae) Porphyra umbilicalis (Bangiaceae) Fauna Phylum Annelida (worms) Pomotoceros triquetes Phylum Arthropoda Balanus crenatus (acorn barnacles)... 

The ability to reduce the apparent quantum yield of PSI in LI as described for Porphyridium purpureum and Porphyra yezoensis (1) was found as a general phenomenon in many red algae (Porphyra umbilicalis, Porphyridium aerugineum, Rhodella violacea, Palmaria palmata and Chondrus crispus). 

FIGURE 3. HOO. utilization capacity for some litmral algae in winter (measured at 7-lOC) and in summer (measur at 17-20 Q. A, Ulva lactuca B, Fucus spiralis C, F. vesiculosus D, F. serratus E, Ascopkyllum nodosum F, Pelvetia canaliculata G, Porphyra umbilicalis. 

Fig. 2a, b. 303 K 200 MHz HNMR spectra of oxidized Fe2S2 ferredoxins solutions (in 50 mM phosphate buffer, pH 7.4) from a) spinach b) red algae Porphyra umbilicalis... 

After placing Porphyra umbilicalis in water adjusted to pH 2 using acetic acid, it is extracted using hot water at pH 6-7. Purification is done by precipitating using ethanol. 

In the United Kingdom the red alga Porphyra umbilicalis is the basis of laver bread prepared traditionally in parts of Wales and Ireland. Similar products are prepared in the United States, where they are known by the Japanese term nori which is used to garnish or wrap sushi . Japanese nori is derived from P. yessoensis and P. tenera (Clifford 2000). 

Mannans yeast mannan, Porphyra umbilicalis Tnafinan... 

The red seaweed Porphyra umbilicalis, which is widely used as a food, contains a predominantly / -d-(i -> 4)-linked mannan along with other polysaccharides (sulfated galactans). The mannan appears to have a branched chain structure with one branch point for every 12 D-mannose residues. 

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