1. Between Gram-positive and Gram-negative organisms gentian violet exhibits the same type of selective activity whether the dye be added to the media on which the bacteria are planted unstained (extrinsic bacteriostasis), or the organisms be stained with it before being planted on plain agar (intrinsic bacteriostasis). In both instances the Gram-positives are inhibited and the Gram-negatives u...

Abnormal levels of brain iron have been reported in parkinsonism, which is characterized principally by degeneration of dopaminergic (DA) nigrostriatal neurons. There are conflicting reports, however, of both increased and decreased iron in parkinsonism. An animal model of parkinsonism was used to clarify the contribution of the loss of nigrostriatal DAergic neurons to abnormal iron accumulatio...

The current study was conducted to find out the most important histological and histochemistry differences in bird A. trisris intestine. samples were dissected; remove fixed 10% formalin, preparing them for histochemical study. results showed there a Histological sections that mucosa of tristis small intestine presented numerous long villi which lined by simple columnar epithelium. In large wit...