Principles used to select drugs for inclusion in combination chemotherapy regimens: 1  Drugs known to be active as single agents should be selected for combinations.  Drugs with different mechanisms of action should be combined in order to allow for additive or synergistic effects on the tumor.
Zebra duikers have gold or red-brown coats with 12-16 distinctive zebra-like stripes, dark markings on their upper legs, and russet faces. Newborns appear darker because they are born with their stripes closer together. An adult can grow to 90 cm (35 in) in length, 45 cm in height, and 20 kg (44 lb) in weight. Their horns are short and round with sharp pointed tips. They are about 4.5 - 5.0 cm long in males, and half that in females. Female body size is larger than males, possibly due to long gestation periods.
1 Zebra mussels get their name from the striped pattern of their shells. 2  However, the pattern varies greatly to where there are no stripes, only dark or light colored shells. 3  Zebra mussels can grow to a maximum length of about 50 mm (5-10 mm in the first year) and live four to five years. As a native to Russia, zebra mussels were introduced into the Great Lakes in 1985 or 1986, when one or more transoceanic ships discharged ballast water into Lake St. Clair. 2  Being a temperate, freshwater species, the zebra mussels found the plankton-rich Lakes St. Clair and Erie to their liking.