During prophase I, each of the homologous pairs of chromosomes can be seen as bivalent or as a grouping of two chromosomes said to be sister chromatids. The site at which the crossing over occurs on the sister chromatids is known as the chiasma. Prophase I is the longest phase during the meiosis process and takes up to 90 percent of the total time of cell division.
Castor beans are pressed to extract castor oil which is used for medicinal purposes. Ricin (a toxic substance present in the plant) does not partition into the oil because it is water-soluble, therefore, castor oil does not contain ricin, provided that no cross-contamination occurred during its production.icin (a toxic substance present in the plant) does not partition into the oil because it is water-soluble, therefore, castor oil does not contain ricin, provided that no cross-contamination occurred during its production.
Other conditions which seem to respond well to castor oil pack treatment include headaches, liver disorders, constipation, intestinal disorders, gallbladder inflammation or stones, conditions with poor elimination, night time urinary frequency and inflamed joints.ackground: The castor bean (Oleum ricini) is known principally as a cathartic (strong laxative). As a castor oil pack placed over the abdomen, usually with heat applied, the oil is absorbed into the lymphatic circulation to provide a soothing, cleansing, and nutritive treatment.