REVIEW OF LITERATURE

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spontaneous nortreatment related histopathological changes were
observed on examination of different organs. The study suggested that
the formulation was devoid of any adverse effect on skin and vital organs
(liver and kidney functions) of rabbit. So Cedrus deodara oil is relatively
safe in the treatment of mange mite in different species of animals.
Avcibasi et al. (1990) described the chemical investigation of
sesquiterpenoid constituents of the exudate of Cedrus libanotica Link
Stump. They isolated thirty two natural products mostly
sesquiterpenoids and most of them characterized, from the natural
fraction of exudate of Cedrus libanotica Link Stump.
Zhang et al. (1990) described the bioactive condensed tannins
from bark. They described chemical properties, enzyme inhibition and
antiplant viral activties of highly condensed procyanidin-type tannins
having protease inhibitory and antiviral activities.These tannins were
isolated from the bark of several trees. Tannin extract from the barks of
Cedrus deodara, Cryptomeria japonica, Ginkgo biloba , Pinus thunbergii,
Prunus armeniaca variety ansur, Prunus yedoensis, Pterocarpus indicus
and Thujopsis dolabrata were dialyzed against water and 0.23-3.73 %
nondialyzed tannins in those barks were found. Tannins were also
obtained in small (trace) amount from the barks of Nerium indicum and
Tsuga sieboldii. The molecular weights of tannins of Cedrus deodara,
Pterocarpus indicus. Prunus yedoensis and Thujopsis dolabrata were