Fs: an antigenic determinant possibly related to the Duffy blood group.
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Biomedical subjects
Publications and source records attributed to M Palatnik.
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Extracts from B. straminea spawn are active against A and B normal red cells. A1 and A2 subgroups may be differentiated with trypsin-, papain- and pronase-treated cells. 0 cells treated with papain, pronase and neuraminidase react weakly to the extracts.
A saline anti-A and incomplete anti-A,B agglutinin were found in spawn extracts of Biomphalaria tenagophila snails. Significance differences after papain and pronase treatments were also found for A1 and A2 subgroups. The hemolysin titers are high, and unspecific.
With the advent of the computer as an educational tool, new avenues have been opened in the teaching of biology. The development of instructional techniques using a variety of mathematical models has assisted and stimulated the study of genetics, particularly that of populations. This article refers to an instructional program by simulation of the genetic drift phenomenon, which enables the student to utilize results that would otherwise take a long time to observe. The authors feel that this teaching method is the only efficient way to teach the phenomenon, since its very complexity makes it very difficult to explain in the postgraduate classroom or through the conventional practical task. The program is being used in a graduate course in genetics; however it is felt that it can be applied to other health sciences fields and adopted to the levels of understanding of the students.
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Protectins and agglutinins in several organs, fluids and spawn from Argentine terrestrial and fresh-water gastropod species were examined. Differences or analogies with vertebrate immunoglobulin serological behaviour are summarized. Individual or group variability and the evolutionary meaning of the reproductive system-linked and the Ca++ ion-linked protectins are discussed.
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