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.
There are several sources of stem cells. Pluripotent stem cells can be isolated from human embryos that are a few days old. Cells from these embryos can be used to create pluripotent stem cell lines âcell cultures that can be grown indefinitely in the laboratory.Pluripotent stem cell lines have also been developed from fetal tissue (older than 8 weeks of development).In late 2007, scientists identified conditions that would allow some specialized adult human cells to be reprogrammed genetically to assume a stem cell-like state. Pluripotent stem cells can give rise to any type of cell in the body except those needed to support and develop a fetus in the womb. 2  Stem cells that can give rise only to a small number of different cell types are called multipotent.