Thus, in mathematical terms a Klein bottle cannot be embedded but only immersed in three dimensions as an embedding has no self-intersections but an immersion may have them.

IOP may reach 40 mmHg or more, and spontaneous remission usually occurs; (3) mild cyclitis: a few white KPs accumulating in the lower half of the cornea, and minimal flare and/or a few inflammatory cells in the anterior chamber; (4) open iridocorneal angle without peripheral anterior synechia; (5) a slight decrease in vision, no visual field defect and normal optic disc at the early stage.

Schlepitchka is a texturing trick done by twirling a feather duster or flogger around gently and dabbing it on the surface of the scenery between each twirl of the tool so that the splayed pattern prints on the scenery.

Fischer's observations confirmed Lyubimenko's opinion that protochlorophyll represents an oxidised form of chlorophyll arising as a by-product during synthesis. Lyubimenko assumed that the first stage of chlorophyll synthesis is oxidation of the chlorophyll precursor, i.e., the hypothetical leucophyll. … The principal stages of initial chlorophyll biosynthesis are the condensation of pyrrole compounds with free alpha-positions, resulting in the formation of a more complex precursor of chlorophyll, i.e., a colorless leuco-compound corresponding to leucophyll. Oxidation of leucophyll leads to the formation of protochlorophyll.