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O antagonismo com acetamida em experimentos com ovinos, caprinos e coelhos indica monofluoroacetato como princ?pio t?xico de Pseudocalymma elegans / Antagonism of acetamid in experiments with sheep, goats and rabbits indicates that monofluoroacetate is the toxic principle of Pseudocalymma elegansHelayel, Michel Jos? Sales Abdalla 16 March 2011 (has links)
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Previous issue date: 2011-03-16 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / This study aimed to evaluate the protective effect of acetamid in experimental poisoning by
Pseudocalymma elegans in sheep, goats and rabbits, in order to prove indirectly that
monofluoroacetate (MF) is responsible for the clinical signs and death of animals that ingested
the plant. Experiments were performed to determine for sheep and goats the lethal dose of P.
elegans collected in Rio Bonito, RJ, in different seasons, and to adjust the dose of acetamid to be
administered. In the first experiment, four animals received 1.0g/kg of fresh P. elegans, and two
others were pretreated with 2.0g/kg of acetamid. None of the animals showed clinical signs or
died. Possibly, the plant could be less toxic, since it was collected at the end of the rainy season.
In the second experiment, two sheep and two goats received 0.67 and 1.0g/kg of the dried plant,
after pretreatment with 2.0 and 3.0g/kg of acetamid, respectively. All animals died, as the
administered doses of P. elegans were very high. In the third experiment, two sheep and two
goats received 0.333g/kg of dried P. elegans after previous administration of 2.0g/kg of
acetamid; a week later, the protocol above was repeated, but without the antidote. In experiments
with rabbits, doses of 0.5 and 1.0g/kg of dried P. elegans were given after administration of
3.0g/kg of acetamid; seven days later, the same protocol was repeated, except the administration
of acetamide. This procedure, when acetamid was administered before, prevented the appearance
of clinical signs and death of sheep, goats and rabbits. But the animals not treated with acetamid
showed symptoms of poisoning and died. Clinically, the sheep and goats had tachycardia,
engorged jugular vein, positive venous pulse, lateral recumbence, and muscle tremors. In the
"dramatic phase?, the animals fell into lateral position, stretched the limbs, were paddling and
died within minutes. The rabbits showed apathy, muscle tremors, vocalization and lateral
decumbence minutes before death. At postmortem examination, the sheep and goats had
engorged jugular veins and atria, dilated Vena cava cranialis and caudalis, as well as pulmonary
edema, hepatic congestion and edema of the gallbladder subserosa. In rabbits, the main
macroscopic alterations were dilated atria, engorged Vena cava cranialis and caudalis, and
congested liver and diaphragm vessels. Histopathology revealed, in two sheep and one goat,
vacuolar-hydropic degeneration of the distal convoluted kidney tubules, together with
caryopicnosis. In the rabbits, the liver showed severe congestion with numerous shock
corpuscles. The experimental results show indirectly that MF is to be held responsible for death
of the animals that ingested P. elegans; since "acetate donor" compounds, such as acetamid, are
capable to reduce the competitive inhibition of MF for the same active site (Coenzyme A) which
prevents the formation of fluorocitrate, its active metabolite, formed in the body through the socalled
"lethal synthesis". / O presente trabalho teve como objetivo avaliar o efeito protetor da acetamida nas
intoxica??es experimentais por Pseudocalymma elegans (Bignoniaceae) em ovinos, caprinos e
coelhos, com a finalidade de comprovar indiretamente que o monofluoroacetato ? respons?vel
pela sintomatologia e morte dos animais que ingerem essa planta. Foram realizados experimentos
para determinar a dose letal da planta coletada em Rio Bonito, RJ, em diferentes ?pocas do ano
para ovinos e caprinos e ajustar a dose de acetamida a ser administrada. No primeiro
experimento, dois ovinos e dois caprinos receberam 1,0 g/kg de P. elegans fresca e um animal de
cada esp?cie foi tratado previamente com 2,0 g/kg de acetamida. Nenhum animal apresentou
altera??es cl?nicas ou morreu. Ao que tudo indica a planta poderia estar menos t?xica, j? que foi
coletada no fim da esta??o das ?guas. No segundo experimento, dois ovinos e dois caprinos
receberam 0,67 e 1,0 g/kg da planta dessecada, ap?s tratamento pr?vio, com 2,0 e 3,0 g/kg de
acetamida, respectivamente. Todos os animais morreram, pois administramos doses muito altas
de P. elegans. No terceiro experimento, dois ovinos e dois caprinos receberam, 0,333 g/kg de P.
elegans dessecada, ap?s administra??o pr?via de 2,0 g/kg de acetamida. Uma semana depois, o
protocolo acima foi repetido, por?m sem o ant?doto. Nos experimentos com coelhos, foram
administradas doses de 0,5 e 1,0 g/kg de P. elegans dessecada ap?s a administra??o de 3,0 g/kg
de acetamida. Sete dias depois, o mesmo protocolo foi repetido, com exce??o da administra??o
de acetamida. Esta, quando administrada previamente, evitou o aparecimento dos sinais cl?nicos e
a morte dos ovinos, caprinos e coelhos, j? os animais n?o tratados com acetamida apresentaram
sintomatologia e morreram. Clinicamente, os ovinos e caprinos manifestaram taquicardia,
jugulares ingurgitadas, pulso venoso positivo, dec?bito esternal e tremores musculares. Na ?fase
dram?tica?, os animais ca?am em dec?bito lateral, esticavam os membros, faziam movimentos de
pedalagem e morriam em poucos minutos. Nos coelhos observaram-se apatia, tremores
musculares, dec?bito lateral e vocaliza??o minutos antes da morte. A avalia??o macrosc?pica
revelou, nos ovinos e caprinos, jugulares ingurgitadas, aur?culas, veia cava caudal e cranial
dilatadas, al?m de edema pulmonar, congest?o hep?tica e edema na subserosa da ves?cula biliar.
Nos coelhos as principais altera??es observadas foram aur?culas dilatadas, veia cava caudal e
cranial ingurgitadas, f?gado e vasos do diafragma congestos. O exame histopatol?gico revelou,
em dois ovinos e um caprino, degenera??o hidr?pico-vacuolar dos t?bulos urin?feros contornados
distais associada ? cariopicnose. Nos coelhos havia congest?o hep?tica acentuada com numerosos
corp?sculos de choque. Nossos resultados comprovam, de forma indireta, que o MF ?
respons?vel pela morte dos animais que ingerem essa planta, uma vez que compostos ?doadores
de acetato? como a acetamida, s?o capazes de reduzir a inibi??o competitiva do MF pelo mesmo
s?tio ativo (Coenzima A), o que impede a forma??o do fluorocitrato, seu metab?lito ativo,
formado no organismo por meio da denominada ?s?ntese letal?.
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Građenje halogenidnih kompleksa kobalta(II) u rastopima smeše neorganskih soli i polarnih organskih jedinjenja / Formation of cobalt(II) halide complexes in molten mixtures of inorganic salts with polar organic compoundsMatijević Borko 21 September 2011 (has links)
<p>U ovoj doktorskoj disertaciji proučavano je građenje kompleksa kobalta(II) sa hloridnim i bromidnim jonima u rastopima koji sadrže jednu neorgansku so i jedno organsko jedinjenje i/ili vodu pri različitom sastavu sistema i na različitim temperaturama. Jedan od sistema je amonijum-nitrat – acetamid – voda sastava NH<sub>4</sub>NO<sub>3</sub>∙(2,61-z)CH<sub>3</sub>CONH<sub>2</sub>∙zH<sub>2</sub>O (z = 0,0 1,61 i 2,61), a drugi sistem je amonijum–nitrat – dimetilsulfoksid (DMSO) sastava NH<sub>4</sub>NO<sub>3</sub>∙zDMSO (z = 1 – 6), na različitim temperaturama (35, 45, 55 i 65 <sup>o</sup>C). Cilj ovog istraživanja je bio određivanje stabilnosti kompleksa kobalta koji se grade sa sa halogenidnim jonima i komponentama rastvarača, pronalaženje kvalitativne i kvantitativne zavisnosti konstanti stabilnosti kompleksa kobalta(II) sa halogenidnim jonima od temperature i molskog odnosa komponenti sistema NH<sub>4</sub>NO<sub>3</sub>∙(2,61-z)CH<sub>3</sub>CONH<sub>2</sub>∙zH<sub>2</sub>O odnosno NH<sub>4</sub>NO<sub>3</sub>∙zDMSO, određivanje termodinamičkih parametara koji karakterišu reakcije asocijacije u ovim sistemima.</p> / <p>In this dissertation the complex formation between cobalt(II) and halide ions in the melts consisting of one inorganic salt, an organic compound and/or water has been studied at different temperatures. Two molten salt systems have been investigated: 1) ammonium nitrate-acetamide-water system NH<sub>4</sub>NO<sub>3</sub>∙(2,61-z)CH<sub>3</sub>CONH<sub>2</sub>∙zH<sub>2</sub>O (z = 0.0 1.61 2.61) and 2) ammonium nitratedimethyl sulfoxide NH<sub>4</sub>NO<sub>3</sub>∙zDMSO (z = 1 – 6), at four different temperatures: 35, 45, 55 and 65 <sup>o</sup>C. The purpose of this work was to determine stability of cobalt(II) complexes formed with the halide ions and the components of the solvents, to discribe the qualitative and quantitative relationships between the stability of the complexes and the melt composition, as well as the changes in the cobalt(II) coordination due to a complex formation. Thermodynamic parameters for cobalt(II) – halide association process in these melts were alsodetermined.</p>
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