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A duplex-PCR method, with 2 pairs of primers recognizing sequences of mitochondrial D-loop region, was developed to identify cows’ milk in the milk of goats. The PCR was shown to be specifi c and sensitive, enabling the detection of less than 1% of cows’ milk added to the milk of goats. Simultaneous use of a primer pair for goats’ and cows’ mitochondrial DNA fragment prevented false negative results...
Polychlorinated biphenyls (PCBs) and chloroorganic insecticides interfere with gas chromatographic analysis, thereby complicating their quantitative determination when multiple compounds are assayed. Perchlorination of the standards of the chlorinated compounds was used to simplify quantitative determination of these contaminants. Results indicate that perchlorination converts PCBs to a single compound...
The authors investigated the pineal blood supply in the rat, including microvascularisation, using different methods of vascular corrosion cast technique and two methods of inspection: scanning electron microscopy (SEM) and light microscope (LM). The animals were divided into three groups and injected with two types of casting media. It was found that the pineal gland is highly vascularised. Arterial...
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