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The effect of antibodies in the intestinal tract was studied in germ-free baby pigs whoso intestinal barrier was closed to macromolecules by the peroral administration of modified cow's milk for the first 72 hours after birth. They were then all contaminated with the pathogenic strain Escherichia cell 055 in amounts of 10' bacterial cells pcr animal. The controls, which were not given any antibodies, all died within 24 hours. All the experimental animals given 12.5--50 ml immune colostrum or serum survived, while of those given 50 ml normal serum or colostrum containing natural antibodies reacting with the Escherichia cell test strain, 50~ survived. ~'o circulating antibodies were found in the serum of the experimental animals after the administration of ~rum or colostrum. The antibodies present in colostrum thus appear to protect the newborn organism directly in the intestinal tract, which is the first site of bacterial invasion, as well as after infiltration into the blood stream.

This paper provides a description of the basic principles and procedures that can be found in strain measurements by means of an experimental method known as the digital image correlation (DIC) while using the correlation system Q-400 and the evaluation software Istra4D. The second part of the paper includes the application of DIC method in strain measurements on a sample made of a PS-1A photoelastic material while using the correlation system Q-400.

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