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1.
Colloq. Agrar ; 18(2): 33-41, mar.-abr. 2022. tab, graf
Article in English | VETINDEX | ID: biblio-1399106

ABSTRACT

Plant species Phytolacca americana (Phytolaccaceae) can be classified as UFP (Unconventional Food Plant); it is used for food and/or medicinal purposes due to its analgesic, anti-inflammatory, anti-rheumatic and anti-arthritic properties; moreover, it is suitable to treat different skin diseases. However, its seeds present integumentary dormancy caused by uneven germination. The aim of the present study is to assess the effect of chemical scarification in sulfuric acid on dormancy overcome in Phytolacca Americana (Phytolaccaceae) seeds. Seeds were immersed in 4 ml sulfuric acid, which was concentrated through different immersion times (2, 5, 8, 11 and 15 min), and compared to the control treatment (without sulfuric acid). The study followed a completely randomized design with six treatments and four repetitions, with 50 seeds per treatment. The following parameters were assessed: days to start germination (DSG), germination (G), germination speed index (GSI), abnormal plantlets (AP), dead seeds (DS), hard seeds (HS) and total dry mass (TDM). Data were subjected to Shapiro-Wilk test for variance normality. The analysis of variance and regression were carried out in RStudio software, version 4.1.0. Means recorded for treatments were compared through Tukey test (p ≤ 0.05). The treatment based on immersion in sulfuric acid for 2 min was the most efficient in overcoming dormancy in this species, since it led to the best results for germination variables and total biomass accumulation in plantlets.


A Phytolacca americana (Phytolaccaceae) é uma espécie que pode ser classificada como PANC (Planta Alimentícia Não Convencional), utilizada para fins alimentícios e/ou medicinais com propriedades analgésicas, antiinflamatórias, antirreumáticas, antiartríticas e, também é adequada para o tratamento de várias doenças de pele. Contudo, suas sementes apresentam dormência tegumentar causando desuniformidade na germinação. Objetivou-se com o presente trabalho avaliar o efeito da escarificação química com ácido sulfúrico na superação da dormência em sementes de Phytolacca americana (Phytolaccaceae). As sementes foram imersas em 4 ml de ácido sulfúrico concentrado por diferentes períodos de imersão (2, 5, 8, 11 e 15 min) comparadas ao tratamento controle (sem ácido sulfúrico). O delineamento utilizado foi o inteiramente casualizado com seis tratamentos e quatro repetições de 50 sementes por tratamento. Foram avaliados os seguintes parâmetros: dias para iniciar a germinação (DIG), germinação (G), índice de velocidade de germinação (IVG), plântulas anormais (PA), sementes mortas (SM), sementes duras (SD), e massa seca total (MST). Os dados foram submetidos ao teste de Shapiro-Wilk para normalidade das variâncias. E a análise de variância e de regressão por meio do software RStudio versão 4.1.0. Sendo as médias dos tratamentos comparadas pelo teste Tukey (p ≤ 0,05). O tratamento de imersão em ácido sulfúrico por 2 min mostrou-se o mais eficiente na superação da dormência dessa espécie, proporcionando melhores resultados nas variáveis germinativas e acúmulo de biomassa total das plântulas.


Subject(s)
Sulfuric Acids/administration & dosage , Germination , Phytolacca/embryology , Plant Dormancy , Plants, Edible , Plant Shoots
2.
J Pharm Pharmacol ; 71(12): 1784-1791, 2019 Dec.
Article in English | MEDLINE | ID: mdl-31579947

ABSTRACT

The alkylaminoalkanethiosulfuric acids (AAATs) are amphipathic compounds effective against experimental schistosomiasis, of low toxicity, elevated bioavailability after a single oral dose and prompt tissue absorption. OBJECTIVES: To explore the in-vitro antileishmanial potential of AAATs using five compounds of this series against Leishmania (Viannia) braziliensis. METHODS: Their effects on promastigotes and axenic amastigotes, and cytotoxicity to macrophages were tested by the MTT method, and on Leishmania-infected macrophages by Giemsa stain. Effects on the mitochondrial membrane potential of promastigotes and axenic amastigotes and DNA of intracellular amastigotes were tested using JC-1 and TUNEL assays, respectively. KEY FINDINGS: The 2-(isopropylamino)-1-octanethiosulfuric acid (I) and 2-(sec-butylamino)-1-octanethiosulfuric acid (II) exhibit activity against both promastigotes and intracellular amastigotes (IC50 25-35 µm), being more toxic to intracellular parasites than to the host cell. Compound I induced a loss of viability of axenic amastigotes, significantly reduced (30%) the mitochondrial membrane potential of both promastigotes and axenic amastigotes and promoted selective DNA fragmentation of the nucleus and kinetoplast of intracellular amastigotes. CONCLUSIONS: In this previously unpublished study of trypanosomatids, it is shown that AAATs could also exhibit selective antileishmanial activity, a new possibility to be investigated in oral treatment of leishmaniasis.


Subject(s)
Antiprotozoal Agents/pharmacology , Leishmania braziliensis/isolation & purification , Leishmaniasis/drug therapy , Sulfuric Acids/pharmacology , Administration, Oral , Animals , Antiprotozoal Agents/administration & dosage , Antiprotozoal Agents/chemistry , Inhibitory Concentration 50 , Leishmania braziliensis/drug effects , Membrane Potential, Mitochondrial/drug effects , Mice , Mice, Inbred BALB C , Structure-Activity Relationship , Sulfuric Acids/administration & dosage , Sulfuric Acids/chemistry
3.
Hig. aliment ; 33(288/289): 1171-1176, abr.-maio 2019. tab
Article in Portuguese | VETINDEX | ID: vti-22528

ABSTRACT

O objetivo deste trabalho foi analisar a estabilidade física e físico-química de silagens com diferentes concentrações de ácido acético e ácido sulfúrico, proferida com resíduos de Brachyplatystoma rousseauxii (Castelnau, 1855) (dourada). O método consistiu da adição de 0,5% de ácido sulfúrico; 3 e 5% de ácido acético (silos diferentes) em resíduos de Dourada. Durante a estocagem foram mensurados os parâmetros: pH, temperatura, umidade, cinzas e lipídios. Os tratamentos demonstraram poucas variações entre si, mantendo-se próximos ao do produto in natura, exceto para os níveis de umidade que apresentaram padrões decrescentes. Contudo, o silo contendo maior concentração de inoculante foi o que apresentou silagem com melhor estabilidade.(AU)


Subject(s)
Animals , Catfishes , Silage/analysis , Acetic Acid/administration & dosage , Sulfuric Acids/administration & dosage , Garbage , Chemical Phenomena
4.
Hig. Aliment. (Online) ; 33(288/289): 1171-1176, abr.-maio 2019. tab
Article in Portuguese | LILACS, VETINDEX | ID: biblio-1482122

ABSTRACT

O objetivo deste trabalho foi analisar a estabilidade física e físico-química de silagens com diferentes concentrações de ácido acético e ácido sulfúrico, proferida com resíduos de Brachyplatystoma rousseauxii (Castelnau, 1855) (dourada). O método consistiu da adição de 0,5% de ácido sulfúrico; 3 e 5% de ácido acético (silos diferentes) em resíduos de Dourada. Durante a estocagem foram mensurados os parâmetros: pH, temperatura, umidade, cinzas e lipídios. Os tratamentos demonstraram poucas variações entre si, mantendo-se próximos ao do produto in natura, exceto para os níveis de umidade que apresentaram padrões decrescentes. Contudo, o silo contendo maior concentração de inoculante foi o que apresentou silagem com melhor estabilidade.


Subject(s)
Animals , Catfishes , Garbage , Silage/analysis , Acetic Acid/administration & dosage , Sulfuric Acids/administration & dosage , Chemical Phenomena
5.
Colloq. Agrar ; 10(1): 09-25, Jan-Jun. 2014. graf, tab
Article in Portuguese | VETINDEX | ID: biblio-1481257

ABSTRACT

O ácido sulfúrico (H2SO4) mostra-se eficaz na superação da dormência em sementes, porém trazendo riscos efetivos aos trabalhadores e ambiente. O objetivo do trabalho foi estudar a efetividade do tratamento com ácido sulfúrico, preconizado pelas RAS, e o emprego de ventilação com ar seco e aquecido na superação da dormência e desempenho germinativo de sementes de seis lotes de Urochloa humidicola cv. Tully. Os efeitos fisiológicos entre tratamentos térmicos (45, 55, 65 e 75 ºC), por 24 ou 48 h, a escarificação com H2SO4 concentrado por 10 min e um controle, foram comparados pela germinação, o índice de velocidade de germinação, o teste de tetrazólio e a massa seca das plântulas. O uso de temperaturas variadas e controladas e de H2SO4 são mecanismos de superação de dormência, porém em lotes com maior vitalidade os resultados foram similares ao H2SO4, podendo ser considerado uma alternativa. De maneira geral, o trabalho não indicou o melhor período (24 ou 48 h), para emprego da ventilação com ar seco, entretanto a temperatura de 60 °C, para os lotes de maior vitalidade (L1, L3 e L5), pode ser recomendada. O H2SO4 nos lotes com maior vitalidade não mostrou significância estatística em relação à testemunha, porém para os lotes com menor vitalidade ocorreu deterioração fisiológica das sementes.


Sulfuric acid (H2SO4) has shown effectiveness in overcoming dormancy, but its use carries effective workers and environmental risks. The objective of this work was to study the sulfuric acid treatment effectiveness, recommended by the RAS, and the use of ventilation with dry, heated air to overcome the dormancy and germination performance of six seed lots Urochloa humidicola cv. Tully. Comparison between the physiological effects of heat treatments at 45, 55, 65 and 75 ºC, with periods 24 and 48 h and chemical scarification (immersion in concentrated H2SO4) for 10 min, constituting eight treatments and two controls was performed. The seed germination, the germination velocity index, the tetrazolium test and seedling dry weight was evaluated. The use of controlled temperatures and of H2SO4 are mechanisms to overcome dormancy, but in lots with greater vitality were equal to conventional treatment with sulfuric acid results and can be considered as an alternative. In general, the work did not show the best indicated time (24 or 48 h) for use with dry air ventilation, however a temperature of 60 °C for lots of high vitality (L1, L3 and L5) might be recommended. The H2SO4 in plots with high vitality was not statistically significant compared to control, but for lots with less vitality occurred physiological deterioration of seeds.


Subject(s)
Brachiaria/growth & development , Plant Dormancy , Germination , Seeds/physiology , Temperature , Sulfuric Acids/administration & dosage
6.
Colloq. agrar. ; 10(1): 09-25, Jan-Jun. 2014. graf, tab
Article in Portuguese | VETINDEX | ID: vti-28393

ABSTRACT

O ácido sulfúrico (H2SO4) mostra-se eficaz na superação da dormência em sementes, porém trazendo riscos efetivos aos trabalhadores e ambiente. O objetivo do trabalho foi estudar a efetividade do tratamento com ácido sulfúrico, preconizado pelas RAS, e o emprego de ventilação com ar seco e aquecido na superação da dormência e desempenho germinativo de sementes de seis lotes de Urochloa humidicola cv. Tully. Os efeitos fisiológicos entre tratamentos térmicos (45, 55, 65 e 75 ºC), por 24 ou 48 h, a escarificação com H2SO4 concentrado por 10 min e um controle, foram comparados pela germinação, o índice de velocidade de germinação, o teste de tetrazólio e a massa seca das plântulas. O uso de temperaturas variadas e controladas e de H2SO4 são mecanismos de superação de dormência, porém em lotes com maior vitalidade os resultados foram similares ao H2SO4, podendo ser considerado uma alternativa. De maneira geral, o trabalho não indicou o melhor período (24 ou 48 h), para emprego da ventilação com ar seco, entretanto a temperatura de 60 °C, para os lotes de maior vitalidade (L1, L3 e L5), pode ser recomendada. O H2SO4 nos lotes com maior vitalidade não mostrou significância estatística em relação à testemunha, porém para os lotes com menor vitalidade ocorreu deterioração fisiológica das sementes.(AU)


Sulfuric acid (H2SO4) has shown effectiveness in overcoming dormancy, but its use carries effective workers and environmental risks. The objective of this work was to study the sulfuric acid treatment effectiveness, recommended by the RAS, and the use of ventilation with dry, heated air to overcome the dormancy and germination performance of six seed lots Urochloa humidicola cv. Tully. Comparison between the physiological effects of heat treatments at 45, 55, 65 and 75 ºC, with periods 24 and 48 h and chemical scarification (immersion in concentrated H2SO4) for 10 min, constituting eight treatments and two controls was performed. The seed germination, the germination velocity index, the tetrazolium test and seedling dry weight was evaluated. The use of controlled temperatures and of H2SO4 are mechanisms to overcome dormancy, but in lots with greater vitality were equal to conventional treatment with sulfuric acid results and can be considered as an alternative. In general, the work did not show the best indicated time (24 or 48 h) for use with dry air ventilation, however a temperature of 60 °C for lots of high vitality (L1, L3 and L5) might be recommended. The H2SO4 in plots with high vitality was not statistically significant compared to control, but for lots with less vitality occurred physiological deterioration of seeds.(AU)


Subject(s)
Sulfuric Acids/administration & dosage , Plant Dormancy , Temperature , Seeds/physiology , Brachiaria/growth & development , Germination
7.
Mem. Inst. Oswaldo Cruz ; 89(4): 595-602, Oct.-Dec. 1994.
Article in English | LILACS | ID: lil-319931

ABSTRACT

The schistosomicidal activity of a new series of alkylaminooctanethiosulfuric acids was studied in white Swiss mice infected with the L.E. strain of Schistosoma mansoni (Belo Horizonte, MG, Brazil). In a preliminary screening of six compounds, two derivatives - 2-[(1-methylpropyl)amino]-1-octanethiosulfuric acid and 2-[(1-methylethyl)-amino]-1-octanethiosulfuric acid - given orally in doses of 300 mg/kg/day for five consecutive days, caused interruption of the oviposition and the hepatic shift of more than 90 of the worms. Both compounds caused a significant reduction in worm burden and, interestingly, the female schistosomes were more susceptible. With the therapeutic schedule of two doses of 800 mg/kg over a 20 day interval, the death of almost all the females and about 50 of the males was observed. Female worms recovered from treated mice showed scattered vitteline glands. Results of in vitro experiments against different developmental stages of the parasite revealed the induction of paralysis and damage to the tegument membrane. The drugs presented no toxic effects on the animals.


Subject(s)
Animals , Male , Female , Mice , Sulfuric Acids/metabolism , Schistosomiasis mansoni , Schistosomicides , Sulfuric Acids/administration & dosage , Schistosoma mansoni , Schistosomicides
8.
Mem Inst Oswaldo Cruz ; 89(4): 595-602, 1994.
Article in English | MEDLINE | ID: mdl-8524062

ABSTRACT

The schistosomicidal activity of a new series of alkylaminooctanethiosulfuric acids was studied in white Swiss mice infected with the L.E. strain of Schistosoma mansoni (Belo Horizonte, MG, Brazil). In a preliminary screening of six compounds, two derivatives - 2-[(1-methylpropyl)amino]-1-octanethiosulfuric acid and 2-[(1-methylethyl)-amino]-1-octanethiosulfuric acid - given orally in doses of 300 mg/kg/day for five consecutive days, caused interruption of the oviposition and the hepatic shift of more than 90% of the worms. Both compounds caused a significant reduction in worm burden and, interestingly, the female schistosomes were more susceptible. With the therapeutic schedule of two doses of 800 mg/kg over a 20 day interval, the death of almost all the females and about 50% of the males was observed. Female worms recovered from treated mice showed scattered vitteline glands. Results of in vitro experiments against different developmental stages of the parasite revealed the induction of paralysis and damage to the tegument membrane. The drugs presented no toxic effects on the animals.


Subject(s)
Schistosomiasis mansoni/metabolism , Schistosomicides/metabolism , Sulfuric Acids/metabolism , Animals , Female , Male , Mice , Schistosoma mansoni/metabolism , Schistosomicides/chemistry , Sulfuric Acids/administration & dosage
9.
Arch Latinoam Nutr ; 40(3): 426-38, 1990 Sep.
Article in Spanish | MEDLINE | ID: mdl-2134145

ABSTRACT

Fish silage was prepared from some fish species of the shrimp by-catch caught in Golfo Triste, Carabobo, Venezuela. Fish were ground until a particle size that would guarantee the liquefaction process was achieved. The process was accelerated by the incorporation of a 3.5% w/w acid mixture, formed by diluted sulfuric acid (1:3) and concentrated formic acid, in a proportion of 1:4. The silage process occurred spontaneously at room temperature during 17 days. Chemical, physical and microbiological tests were conducted in order to characterize both the raw material and the final product. The raw material used had adequate levels of freshness, so that it was suitable for use, thus producing a first-grade silage. A first biological evaluation was carried out in rats in order to estimate the protein quality of the silage by means of certain biological parameters such as PER, NPR and apparent digestibility percentage of the protein. The results of the first experimental period demonstrated that the fish silage protein was of optimal quality, since the biological response in rats was similar to that of the control group fed the casein diet.


Subject(s)
Fish Products , Food Handling , Silage/analysis , Animal Nutritional Physiological Phenomena , Animals , Body Weight , Dietary Proteins/analysis , Food Preservation , Food Technology , Formates/administration & dosage , Nutritive Value , Rats , Sulfuric Acids/administration & dosage , Weight Gain
10.
Arch. latinoam. nutr ; Arch. latinoam. nutr;40(3): 426-38, sept. 1990. tab
Article in Spanish | LILACS | ID: lil-100384

ABSTRACT

Se elaboró un ensilado de pescado con algunas de las especies que conforman la fauna de acompañamiento del camarón capturadas en Golfo Triste, Estado Carabobo. Las mismas se molieron en su totalidad hasta un tamaño de partícula tal que garantizara el proceso de licuefacción. El proceso fue acelerado mediante la incorporación de una mezcla de ácido fórmico concentrado, ambos mezclados en la proporción de 1:4. El proceso transcurrió espontáneamente a temperatura ambiente por espacio de 17 días. Se realizaron análisis químicos, físicos y microbiológicos a fin de caracterizar la materia prima y el producto terminado. La materia prima utilizada acusó niveles adecuados de frescura, por lo que se consideró apta para su empleo y procesamiento, produciéndose de esta forma, un ensilado de pescado adecuado. Se llevó a cabo una primera evaluación biológica en ratas, a fin de estimar la calidad proteínica del ensilado de pescado mediante los siguientes parámetros biológicos: razón de eficiencia proteínica (PER), razón proteínica neta (NPR) y porcentaje (%) de digestibilidad aparente de la proteína. Los resultados del primer período experimental demostraron que la proteína del ensilado de pescado es de óptima calidad, en virtud de que el mismo tuvo una respuesta biológica en ratas, similar a la del grupo "control" de caseína


Subject(s)
Animals , Rats , Fish Products , Silage/analysis , Sulfuric Acids/administration & dosage , Animal Nutritional Physiological Phenomena , Biological Assay , Food Handling , Food Preservation , Food Technology , Formates/administration & dosage , Nutritive Value , Dietary Proteins/analysis , Weight Gain
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