Could the transient aggregation of unicellular organisms have paved the way for the evolution of the multicellular animals?

this study was conducted for identification and introduce of tintinnida order in iranian waters of oman sea from hormuz strait to pasabandar, chabahar, in 2007. ten transects each with four fixed stations had been chosen. samplings were conducted in two seasons before and after monsoon. depth of sampled stations in the studied area varied from zero to 20m and 20 to 50m and in station one becaus...

Because of limitations of production of unicellular green algae (especially in large volumes), this study aimed to culture Artemia using three sources of cheap agricultural by-products that were coupled with small amounts of unicellular algae Dunaliella salina. The results of growth and survival, biomass production, Individual wet weight, wet and ash percent, FCR and SGR and nutritional value o...

An operator is unicellular if its lattice of invariant subspaces is totally ordered by inclusion. The list of nests which are known to be the set of invariant subspaces of a unicellular operator is surprisingly short. We construct unicellular operators on lp, 1 ^ p < oo, and on c0 with lattices isomorphic to a + X + ß* where a and ß are countable (finite or zero) ordinals, and X is in this shor...

A unicellular map, or one-face map, is a graph embedded in an orientable surface such that its complement is a topological disk. In this paper, we give a new viewpoint to the structure of these objects, by describing a decomposition of any unicellular map into a unicellular map of smaller genus. This gives a new combinatorial identity for the number ǫg(n) of unicellular maps with n edges and ge...

N2-fixing proteobacteria (alpha and gamma) and unicellular cyanobacteria are common in both the tropical North Atlantic and Pacific oceans. In near-surface waters proteobacterial nifH transcripts were present during both night and day while unicellular cyanobacterial nifH transcripts were present during the nighttime only, suggesting separation of N2 fixation and photosynthesis by unicellular c...