Results: 158

Antitumor activity of chemical modified natural compounds

Mem. Inst. Oswaldo Cruz; 86 (supl.2), 1991
Search of new activity substances starting from chemotherapeutic agents, continously appears in international literature. Perhaps this search has been done more frequently in the field of anti-tumor chemotherapy on account of the unsuccess in saving advanced stage patients. The new point in this matter d...

Quaternary ammonium salt derivatives of allylphenols with peripheral analgesic effect

Mem. Inst. Oswaldo Cruz; 86 (supl.2), 1991
Ammonium salt derivatives of natural allylphenols were synthesized with the purpose of obtaining potential peripheral analgesics. These drugs, by virtue of their physicochemical properties, would not be able to cross the blood brain barrier. Their inability to enter into the central nervous system (CNS) ...

Potential sources of biodynamically active natural products in Brazil

Mem. Inst. Oswaldo Cruz; 86 (supl.2), 1991
In contrast to China where vegatation is predominantly herbaceous, vegetation in Brazil is commonly arboreous. This fact may explain why Chinese drugs are usually acetate derived, while actual and potential natural therapeutic agents from Brazil are mostly shikimate derived. Only relatively few compounds...

Derivados azoicos da oxina com sulfas potencialmente antimalaricas
Oxine azoic derivatives with potentially antimalarial sulfonamides

Com o objetivo de obter farmacos potencialmente antimalaricos prepararam-se, pelo processo de hibridacao molecular, cinco compostos mediante reacao do sal de diazonio e sulfas antimalaricas - sulfadiazina, sulfadoxina, sulfametoxipiridazina, sulfametoxazol e sulfamonometoxina - com a oxina (8-hidroxiquin...

Latenciacao de quimioterapicos-sintese de acriloilderivados de antimalaricos
Drug latentiation: synthesis of acriloylderivatives of antimalarial agents

Com o objetivo de se obter, atraves do metodo da latenciacao, pro-farmacos de acao antimalarica prolongada e menor toxicidade, foram sintetizados derivados acriloilicos da dapsona e das seguintes sulfas antimalaricas: sulfadiazina, sulfadimetoxina, sulfadoxina, sulfametoxazol, sulfametoxidiazina, sulfame...

Sintese de novos derivados do acido 3-fosfonopropionico
Synthesis of new derivatives of 3-phosphonopropionic acid

Foram sintetizadas tres series de derivados do acido 3-fosfonopropionico, compreendendo 22 substancias, das quais 16 ainda nao descritas na literatura. Todas as substancias foram caracterizadas por analise elementar, espectroscopia no infravermelho e espetrometria de ressonacia magnetica protonica. Os co...

Identificación de enzimas glucosiltransferasas en muestras de placa dental provenientes de pacientes con caries

Demostración del origen extracelular de las enzimas glucosiltransferasas, mediante un estudio de microscopía electrónica del homogenato de placa y por medición de la actividad de Lactato Deshidrogenasa como marcador citoplasmático, comprobandose finalmente, la presencia de GTF extracelular en placa ...

Acción del veneno de la oruga Lonomia Achelous sobre el mecanismo hemostatico de los conejos

El contacto con el veneno de la oruga Lonomia achelous produce en humanos un síndrome hemorrágico, debido a alteraciones en la hemostasis. Los estudios de coagulación y fibrinolisis de los pacientes mostraron, como signos constantes, disminución del fibrinógeno,plasminógeno, factor XIII y aparició...

Semicarbazonas heterociclicas potencialmente antifungicas: 1. Preparacao e caracterizacao
Potentially antifungical heterocyclic semicarbazones: 1. Preparation and characterization

Com o objetivo de elucidar a estrutura de semicarbazonas heterociclicas potencialmente antifungicas, foram preparados quatro compostos desta classe. Eles foram analisados mediante espectrometria de infravermelho, ultravioleta e ressonancia magnetica protonica, que corresponderam as estruturas esperadas...