In addition, another type of orange oil is extracted from a different species of orange tree. Orange oil is a popular essential oil that is used in aromatherapy to treat various health problems, so understanding the differences between the orange oils is useful to know. Bitter Orange Oil Bitter orange (Citrus aurantium var. amara) oil is extracted from the the fruit of the bitter orange tree by cold expression.
Cloning around. Some plants have cells that are able to convert from a structured, or differentiated, state to a totipotent state. One example is the ZZ plant (Zamioculcas zamiifolia). This plant is so cellularly precocious that a mere piece of leaf or stem can be used to grow a new plant.
Embryonic stem (ES) cells are also called totipotent cells. 1  The first steps involve making more cells by simple cell division: one cell becomes two cells; two cells become four cells, etc. 2  Each cell of early development is undifferentiated; that is, it is not yet specialized to carry out a specific body function.