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.
All of the specialized cells that make up these body systems are descendants of the original zygote, a stem cell with the potential to ultimately develop into all kinds of body cells. The cells of a zygote are totipotent, meaning that they have the capacity to develop into any type of cell in the body. The process by which stem cells commit to become differentiated, or specialized, cells is complex and involves the regulation of gene expression. Research is ongoing to further understand the molecular events and controls necessary for stem cells to become specialized cell types.