As was described previously, an antiserum to polypeptide 11000 inhibited photosynthetic electron transport on the oxygen evolving side of photosystem II. The effect of the antiserum on chloroplasts from two tobacco mutants also clearly showed that the inhibition site is on the photosystem II-side of the electron transport chain. One of the two tobacco mutants lacks the oxygen evolving capacity ...

1. A relationship between the soluble specific substances of pneumococci and the blood group substance A of man can be demonstrated by the inhibition of sheep cell hemolysis by a group specific A-antiserum. However, there are quantitative differences between the various types. 2. A striking difference exists between the acetyl and the de-acetylated polysaccharide of Pneumococcus Type I: The de-...

Serum gastrin is known to be elevated in patients with liver-metastasizing colon cancer; thus, cholecystokinin (CCK) B/gastrin receptors may also be up-regulated. A liver-invasive model of colon cancer was established with the human colonic cell line C170HM2, which expresses the CCKB/gastrin receptor at both the gene and protein level. An antiserum has been derived that is directed against the ...

A polypeptide fraction with the apparent molecular weight 11 000 was isolated from stroma-freed chloroplasts from Anthirrhinum majus. An antiserum to this polypeptide fraction inhibits photosynthetic electron transport in chloroplasts from Nicotiana tabacum. The relative degree of inhibition is pH dependent and has its maximum at pH 7.4. The maximal inhibition observed was 93%. The dependence o...

1. When vaccine virus and its specific antiserum are brought together, no evidence of stable union between them can be determined by the experimental methods employed. 2. A definite relationship exists between the degree of dilution of a neutral vaccine virus-antiserum mixture and the size of the lesion produced by endermic inoculation of rabbits of any given dilution.

Factor 6d antiserum reacts with the new Streptococcus pneumoniae serotype 6C. Serogroup 6 isolates, consisting of 49 6A, 42 6B and 98 6C strains from the United States and Israel, serotyped in parallel by PCR and capsular swelling methods, were all identified correctly. The new factor 6d antiserum accurately identifies serotype 6C.