Possible role of prostaglandin F in blastocyst implantation

The synthesis and release of Prostaglandin F (PGF) by the rabbit blastocyst and endometrium were investigated on Day 6 and Day 7, using radioimmunoassay, autoradiography and conversion experiments. The following results were obtained: The content of PGF in the blastocyst increased significantly (P less than 0.01) from Day 6 to Day 7. The content of PGF in the endometrium was significantly higher (P less than 0.05) on Day 7 implantation sites compared to the other areas. The in vitro synthesis and release of PGF by Day 6 blastocysts sharply increased after one and two hours of culture, respectively. Thereafter both values declined with time. The in vitro synthesis and release of PGF by Day 6 endometria increased continuously with time. 14C-arachidonic acid (14C-AA) was incorporated into Day 6 blastocysts in vitro and converted to PGF2 alpha. These results suggest that both the endometrium and the blastocyst are the sources of the PGs involved in implantation, and that PGF derived from the blastocysts may act as the trigger of implantation.     

Action of chlorophyllase purified from rye seedlings on light-harvesting bacteriochlorophyll of chromatophores and spheroplasts from Rhodospirillum rubrum

1. The chlorophyllase [EC 3.1.1.14] purified from greened rye seedlings hydrolyzed the bacteriochlorophyll isolated from Rhodospirillum rubrum, but not the pigment bound to the membrane of chromatophores or spheroplasts from the bacterium. 2. Acetone, if added at such concentrations that the bound bacteriochlorophyll would not be solubilized, enabled the enzyme to hydrolyze the bound pigment. The acetone concentrations required for half the maximum hydrolysis rates were 16% with chromatophores and 7% with spheroplasts. 3. The enzymic hydrolysis of the bound bacteriochlorophyll in the presence of acetone removed bacteriochlorophyllide from the membrane, leaving its esterifying alcohol, possibly all-trans-geranylgeraniol, in situ. 4. Washing of chromatophores with 30% acetone removed about 10% of the bound bacteriochlorophyll. The bound pigment remaining after washing was not hydrolyzed by the enzyme unless acetone was added. 5. It seems possible that light-harvesting bacteriochlorophyll was mostly, if not all, bound to the inner surface of chromatophores (the outer surface of spheroplasts), having its esterifying alcohol residue buried in the membrane and its porphyrin residue emerging from the membrane into the inside solution; thus, chlorophyllase could not make contact with the ester linkage between the esterifying alcohol and porphyrin moieties of the pigment unless the esterifying alcohol residue was partly exposed.     

Effect of Streptococcus faecalis BIO-4R on intestinal flora of weanling piglets and calves.

The effect of oral administration of Streptococcus faecalis BIO-4R, an antibiotic-resistant lactic acid bacterium, on the intestinal flora of weanling piglets and cows reared on antibiotic-containing diet was investigated. Fourteen days after administration of the bacteria, the intestinal flora of the piglets was examined. Animals of the administered group had stabilized lactic flora such as bifidobacteria, streptococci, and lactobacilli, whereas most animals of control group had reduced lactic flora. On the other hand, abundant yeasts were detected from the cecum, colon, and feces of the control animals, but the levels were significantly lower in the animals given strain BIO-4R. The density of Salmonella in the intestine appeared to be reduced after the administration of strain BIO-4R. The number of BIO-4R cells was shown to be 10 times lower in the duodenum and jejunum than in the ileum, suggesting that strain BIO-4R might have grown transiently in the ileum. The similar trend toward stabilization of the lactic flora was also observed in cows after administration of BIO-4R. In addition, an antagonistic effect of the strain against yeasts and Salmonella was suggested. These findings indicate that the oral administration of strain BIO-4R is one of the useful methods whereby the potentially deleterious effect of antibiotics on the intestinal flora of farm animals may be minimized.     

Recognition sites for a membrane-derived DNA binding protein preparation in the E. coli replication origin

Summary The DNA binding protein B' preparation, isolated from the membrane of E. coli, recognizes two sites, one of which is locatd in the minimum oriC (35–270 bp) and the other between base pairs 417 and 488. Recognition is only possible when restriction fragments containing these sites are in single-stranded state. At the first site the strand reading 3OH-5P in the direction of the E. coli genetic map is recognized, at the second site the 5P-3OH strand.     

The frequency among Japanese of heterozygotes for deficiency variants of 11 enzymes

Eleven human enzymes, chosen for this study because of relatively small coefficients of variation for mean activity, have been surveyed for the frequency with which activities less than or equal to 66% of the mean value occur. This criterion should detect almost all heterozygotes for variants lacking any activity plus a fraction of the persons with variants characterized by markedly depressed activity and/or instability. The enzymes surveyed are TPI, PGK, AK1, LDH, GAPD, GPI, PK, 6PGD, G6PD, GOT1, and HK. The number of determinations per enzyme ranged from 310 to 3,173, for a total of 26,634 determinations. Family studies have thus far been possible in 52 instances in which the initial observation of activity less than or equal to 66% of normal was confirmed. In every instance, a parent exhibited a similar finding, giving confidence that a true genetic entity was being detected. With this approach, the frequency of heterozygotes per 1,000 determinations varied from 0.0 (AK1, 6PGD) to 13.8 (PK), with an average of 2.4. For these same systems, in this laboratory the frequency of "rare" electrophoretic variants is 2.3/1,000, the ratio of the latter to the former thus being 1.0 in Japanese. Our experience with these deficiency phenotypes to date suggests that for selected enzymes such phenotypes can be incorporated into a program designed to detect mutational events.     

Anisakiasis: preparation of a stable antigen for indirect fluorescent antibody test

By coupling Anisakis larval hemoglobin with cyanogen bromide-activated Sepharose, a stable and sensitive antigen for the indirect fluorescent antibody test for anisakiasis was prepared. Using this antigen, cross-reaction with other helminth infections was minimized and the test was greatly simplified.Furthermore, the results obtained indicate that this technique may be useful not only in the sero-diagnosis of anisakiasis but may also be applicable to the diagnosis of other helminthic diseases.