Dipicolinic acid (DPA), present in large amount bacterial spores, has been proposed to act as an endogenous photosensitizer spore photoproduct formation. The mechanism involves a triplet-triplet energy transfer from DPA thymine. However, up now, no spectroscopic studies have performed determine the interaction between compound and nucleobase, probably due its photolability aqueous solutions. He...

LTHOUGH infectious mononucleosis is a benign disease, many manifestations are similar to those observed in malignant transformation of lymphocytes. Among these are generalized lymphadenopathy and hepatosplenomegaly, the occurrence of morphologically abnormal cells in the periphera! blood and occasionally in the bone marrow, associated Coombs’ positive hemolytic anemias, and abnormal protein pro...

LTHOUGH infectious mononucleosis is a benign disease, many manifestations are similar to those observed in malignant transformation of lymphocytes. Among these are generalized lymphadenopathy and hepatosplenomegaly, the occurrence of morphologically abnormal cells in the periphera! blood and occasionally in the bone marrow, associated Coombs’ positive hemolytic anemias, and abnormal protein pro...

In the autoradiograms of young rats injected with thymidine-H3 many of the granule cells of the dentate gyrus were found labeled. The number of labeled cells declined rapidly with increased age at the time of injection. Histological studies showed the presence in young rats of a large germinal matrix of mitotic cells in the ependymal and subependymal layers of the third and lateral ventricles. ...

statement of the problem: t cells have been shown to play a role in the etiopathogenesis of periodontal disease. b7-h3, a costimulatory molecule, is found to be associated with regulation of t cell function in some tumoral tissues, as well as autoimmune and inflammatory diseases. purpose: the aim of this study was to investigate the expression of b7-h3 molecule in healthy and diseased gingival ...

Prostaglandin E1 (PGE1) suppresses mitotic activity in the epithelial cells of rat lenses maintained in organ culture. At a concentration of 5 x 10(-5)M, PGE1 caused gradual inhibition of mitosis which was first evident after six hours of incubation and was maximum at 50 per cent of control values after 16 and 24 hours in culture. During this period prostaglandin-treated lenses showed no change...

F OLLOWING INCUBATION with H3 Thymidine and using autoradiography Bond et al.1 have demonstrated the presence of a small number of circulating labeled mononuclear cells in specimens of blood obtained from normal persons under in vitro conditions. This presumably demosistrates the capacity of these cells for DNA synthesis, division and proliferation. Rubini et al.2 have described the incidence o...

An experimental study was made of the distribution of the primary hypoblastic cells in the lower layer of the avian blastoderm throughout primitive streak formation and until stage 10 (Hamburger & Hamilton, 1951). The primary hypoblast of stage XIII (Eyal-Giladi & Kochav, 1976) chick blastoderms was exchanged for either an [H3]thymidine-labelled similar chick hypoblast, or a quail primary hypob...