[Antimicrobial substances of superior plants. 45. Primary observations of 2 new quinoids isolated from Hyptis fructicosa Salzm ex Benth(Labiatae)]. / Substáncias antimicrobianas de plantas superiores. Communicação XLV. Primeiras observações sobre dois novos quinonoides isolados de Hyptis fructicosa Salzm ex Benth. (Labiatae)

The authors present the first observations on the isolation of two quinonoid compounds from Hyptis fructicosa Salzm ex Benth; Labiatae. The referred naturally compounds present antimicrobial and antineoplastic activity against Gram-positive microrganisms and mouse Erlich carcionama, respectivelly.

[Menadione and its stimulant effect on the growth of animals]. / Menandiona e seu efeito estimulante no crescimento de animais jovens

This paper deals with the stimulatory effect of the compound 2-methyl-1,4-naphthoquinone, Menadione (vit. K3), in young chicken, during the growing period. That's the case of other products like Bacitracin, Actinomycin D and Terramycin, whose hormetic activity is supplanted by the referred Menadione. Authors present the experimental data with analytical discussion of the results.

[O and C prenylated chalcones with antineoplastic and antibiotic activities isolated from Lonchocarpus neuroscapha Benth]. / Chalconas o- ec-preniladas com atividades antibiótica e antineoplásica, isoladas de Lonchocarpus neuroscapha Benth

In the course of our program on the antimicrobial and antineoplastic substances from higher plants we have studied many flavonoid compounds isolated from root back of Lonchocarpus neuroscapha Benth. In the present paper a slight effect on sarcoma 180 and Ehrlich carcinoma of cordoin, 4-hydroxy-cordoin and 4-hydroxy-derricin, as well as the only observed effect of derricin on sarcoma 180 were observed. The antimicrobial action of four prenylated chalcones, i.e. 4-hydroxy-derricin, 4-hydroxy-lonchocarpin, 4-hydroxy-cordoin and 4-hydroxy-isocordoin is reported.

[Antimicrobial substances of superior plants. 44. Isolation of diterpene acid from Croton aff. argyrophylloides Muell arg. (Euphorbiaceae)]. / Substáncias antimicrobianas de plantas superiores. comunicação XLIV. Isolamento de um ácido diterpènico de Croton aff. argyrophylloides Muell arg. (Euphorbiaceae)

In this paper the authors present the first report concerning the biological effects of a diterpene isolated from Croton aff. argyrophylloides Muell. Arg (Euphorbiaceae). Some biological and physiochemical properties of the antibiotic, named argyrophillic acid, were appreciated in comparison with those presented by cunabic acid, an antibiotic isolated from Icthyothere cunabi. The authors still show the microbial action of the abietic acid and confront it with that of the argyrophilic acid, the new antibiotic here reported.