Production of yeast growth stimulants by molds on various media

It has been shown that the molds Aspergillus niger, Aspergillus clavatus, Trichoderma ligorum, Rhizopus nigricans, and Penicillium roqueforti are capable of producing a substance or substances stimulating yeast growth;It has been shown that this material of a Bios nature is produced from both glycerine and sucrose substrates;The Bios producing properties of Aspergillus niger have been studied with respect to time, the composition of the media, production of acids, and of mycelium;A study of the nature of the stimulant has been made;It has been shown that the Bios produced by mold is apparently not the same as Miller\u27s Bios fractions;A synthetic medium has been devised which gives high yields of acid and mycelium with Aspergillus niger

Production of yeast growth stimulants by molds on various media

It has been shown that the molds Aspergillus niger, Aspergillus clavatus, Trichoderma ligorum, Rhizopus nigricans, and Penicillium roqueforti are capable of producing a substance or substances stimulating yeast growth;It has been shown that this material of a Bios nature is produced from both glycerine and sucrose substrates;The Bios producing properties of Aspergillus niger have been studied with respect to time, the composition of the media, production of acids, and of mycelium;A study of the nature of the stimulant has been made;It has been shown that the Bios produced by mold is apparently not the same as Miller's Bios fractions;A synthetic medium has been devised which gives high yields of acid and mycelium with Aspergillus niger.</p

Sand pine regeneration on the Ocala National Forest /

Bibliography: p. 36-37.Mode of access: Internet

Efeito de extratos orgânicos, associados ao surfactante tween 80, na germinação e crescimento de plântulas de alface Effect of organic extracts associated with surfactant Tween 80 on seed germination and seedling growth of lettuce

Com este trabalho, visou-se a identificar, por meio de bioensaio, o efeito dos extratos de caruru (Amaranthus retroflexus L.), capim-marmelada (Brachiaria plantaginea (Link.) Hitchc.), mentrasto (Ageratum conyzoides L.) e de três cultivares de milho (AG1051, C333 e C435) sobre a germinação e crescimento de alface (Lactuca sativa L. cv. Marisa AG216). Os extratos metanólicos foram concentrados sob vácuo e solubilizados em surfactante Tween 80 a 1% (v/v) em água. A seguir, aplicaram-se as soluções obtidas em papel de filtro sobre placa de Petri, onde foi semeada alface. Utilizaram-se água destilada como testemunha e surfactante Tween 80 a 1% como tratamento branco. O extrato de mentrasto, o de caruru e da cultivar de milho AG1051 promoveram redução no índice de velocidade de germinação em relação à testemunha com água destilada. O percentual de germinação foi afetado apenas pelo extrato de mentrasto (82,5% de redução). Todos os extratos e o surfactante Tween 80 provocaram inibição do crescimento de radículas de plântulas de alface, com redução de comprimento de raiz entre 9,53 e 14,83 mm, e de hipocótilo, entre 21,6 a 30,95 mm.<br>This work aimed at identifying, through bioassay, the effect of organic extracts of pigweed (Amaranthus retroflexus L.), signal grass (Brachiaria plantaginea (Link.) Hitchc.), ageratum (Ageratum conyzoides L.) and three corn cultivars (AG1051, C333 and C435) on lettuce (Lactuca sativa L. cv. Marisa AG216) germination and seedling. Thus, the methanolic extracts of their straws were concentrated under vacuum and dissolved in 1% (v/v) aqueous surfactant Tween 80. Then, the resulting solutions were applied to filter papers contained in Petri dishes, where lettuce was sowed. Distilled water and 1% Tween 80 were used as controls treatment. The corn cultivar extracts AG1051, pigweed and ageratum promoted reduction of the germination index in relation to the control with distilled water. The germination percentage was affected by ageratum extract (82.5% less than the control). All extracts and the surfactant Tween 80 promoted inhibition lettuce seedling growth with reduction of root length between 9.53 and 14.83 mm and hypocotyls between 21.64 to 30.95 mm