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Registro Completo |
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
08/11/2023 |
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Data da última atualização: |
08/11/2023 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
MATOS, M. V. R.; MAMEDES, A. de S.; SOUZA, E. G. de; SILVA, T. T. da; CRUZ, M. R. N. da; PIMENTEL, M. A. G. |
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Afiliação: |
MARCUS VINICIUS RODRIGUES MATOS, UNIVERSIDADE FEDERAL DE SÃO JOÃO DEL-REY; ARTUR DE SOUZA MAMEDES, UNIVERSIDADE FEDERAL DE SÃO JOÃO DEL-REY; EZEQUIEL GARCIA DE SOUZA, UNIVERSIDADE FEDERAL DE LAVRAS; THAÍNE TEIXEIRA DA SILVA, UNIVERSIDADE FEDERAL DE SÃO JOÃO DEL-REY; MARIA RITA NUNES DA CRUZ, UNIVERSIDADE FEDERAL DE SÃO JOÃO DEL-REY; MARCO AURELIO GUERRA PIMENTEL, CNPMS. |
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Título: |
Sistemas de armazenamento selecionados para pequena produção de milho visando manutenção da qualidade. |
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Ano de publicação: |
2023 |
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Fonte/Imprenta: |
In: CONFERÊNCIA BRASILEIRA DE PÓS-COLHEITA, 8., 2023, Rio Verde, GO. Anais... Londrina: Associação Brasileira e Pós-Colheita, 2023. |
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Páginas: |
p. 173-180. |
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Idioma: |
Português |
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Conteúdo: |
O armazenamento de grãos de milho enfrenta desafios devido a ação de agentes bióticos e abióticos, causando perdas econômicas. Sistemas de armazenamento adequadas para menores escalas de produção, como na agricultura familiar e demais nichos específicos, podem manter a qualidade dos grãos por períodos prolongados. O estudo tem como objetivo avaliar a eficiência de métodos alternativos de armazenamento de grãos, incorporando embalagens plásticas e inseticidas de baixo impacto, focando na conservação e qualidade dos grãos. Grãos de milho foram submetidos a cinco tratamentos, incluindo sacos de ráfia, com revestimento de sacos de ensilagem, associados ou não com terra de diatomáceas, e tambores plásticos. Os grãos foram armazenados por 230 dias e amostras coletadas a cada 45 dias, para avaliação de parâmetros qualitativos, como umidade, massa específica aparente e classificação. Os sistemas herméticos, como sacos plásticos e tambores, além dos tratamentos com uso de terra de diatomáceas, mostraram ser soluções viáveis para armazenagem de pequena escala, mantendo os padrões aceitáveis de qualidade ao longo do período de armazenamento. |
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Palavras-Chave: |
Armazenamento hermético; Classificação de grãos. |
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Thesagro: |
Agricultura Familiar; Zea Mays. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1158045/1/Sistemas-de-armazenamento-selecionados-para-pequena-producao-de-milho.pdf
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Marc: |
LEADER 01997nam a2200229 a 4500
001 2158045
005 2023-11-08
008 2023 bl uuuu u00u1 u #d
100 1 $aMATOS, M. V. R.
245 $aSistemas de armazenamento selecionados para pequena produção de milho visando manutenção da qualidade.$h[electronic resource]
260 $aIn: CONFERÊNCIA BRASILEIRA DE PÓS-COLHEITA, 8., 2023, Rio Verde, GO. Anais... Londrina: Associação Brasileira e Pós-Colheita$c2023
300 $ap. 173-180.
520 $aO armazenamento de grãos de milho enfrenta desafios devido a ação de agentes bióticos e abióticos, causando perdas econômicas. Sistemas de armazenamento adequadas para menores escalas de produção, como na agricultura familiar e demais nichos específicos, podem manter a qualidade dos grãos por períodos prolongados. O estudo tem como objetivo avaliar a eficiência de métodos alternativos de armazenamento de grãos, incorporando embalagens plásticas e inseticidas de baixo impacto, focando na conservação e qualidade dos grãos. Grãos de milho foram submetidos a cinco tratamentos, incluindo sacos de ráfia, com revestimento de sacos de ensilagem, associados ou não com terra de diatomáceas, e tambores plásticos. Os grãos foram armazenados por 230 dias e amostras coletadas a cada 45 dias, para avaliação de parâmetros qualitativos, como umidade, massa específica aparente e classificação. Os sistemas herméticos, como sacos plásticos e tambores, além dos tratamentos com uso de terra de diatomáceas, mostraram ser soluções viáveis para armazenagem de pequena escala, mantendo os padrões aceitáveis de qualidade ao longo do período de armazenamento.
650 $aAgricultura Familiar
650 $aZea Mays
653 $aArmazenamento hermético
653 $aClassificação de grãos
700 1 $aMAMEDES, A. de S.
700 1 $aSOUZA, E. G. de
700 1 $aSILVA, T. T. da
700 1 $aCRUZ, M. R. N. da
700 1 $aPIMENTEL, M. A. G.
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Embrapa Milho e Sorgo (CNPMS) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
23/04/2003 |
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Data da última atualização: |
23/10/2019 |
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Autoria: |
ELOY, A. M. X. |
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Afiliação: |
ANGELA MARIA XAVIER ELOY, CNPC. |
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Título: |
Stress, opioid peptides and luteinizing hormone secretion in ewes. |
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Ano de publicação: |
1995 |
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Fonte/Imprenta: |
1995. |
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Páginas: |
172 f. |
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Idioma: |
Inglês |
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Notas: |
Thesis (Doctor of Phylosophy) - University of Leeds, Leeds. |
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Conteúdo: |
The studies performed in this thesis aim to clarify the effects of physiologicaI and psychologicaI stresses on the plasma concentrations of cortisol and B-endorphin and the consequent effects on gonadotropin (LH) release in long-term ovariectomized ewes. AIso, a study was made of the. endogenous opioid involvement during application of these two kinds of stressors through the use of an opioid antagonist (naloxone). In this work not only was the peripheraI effect of naloxone evaluated but also its central action on the hypothalamo-pituitary adrenal axis activity and gonadotropin (LH) release. Plasma concentrations of B-endorphin and cortisol were elevated during acute (4 hours) insulin-induced hypoglycemia (2mU/kg/min) stress while plasma LH concentrations were inhibited. Infusion of the opioid antagonist naIoxone hydrochloride (5.5ug/kg/min) blocked the inhibitory effect of B-endorphin on LH release. It was concluded that endogenous opioids are involved in the control of LH release during hypoglycemia in ovariectomized ewes. In addition, this experiment detected no effect of acute hypoglycemia on episodic LH in ovariectomized animais. However, it was possible to observe a stimulatory effect of naIoxone on the LH pulse frequency in the first two hours after the beginning of the infusion, suggesting that this antagonist has short half life. During chronic (12 hours) insulin-induced hypoglycemia (2mU/kg/min), plasma ,B-endorphin levels retumed to basal levels while plasma cortisol concentrations showed a rise, suggesting incomplete feedback of corticosteroids on ACTH. LH levels remained low even during control treatment and naloxone (5.5Jlg/kg/min) infusion was not ~ble to stimulate the release of this hormone. In this case the long absence of ovarian steroids could be responsible for the lack of naloxone response and siso for the low levels of LH during saline infusion. The isolation stress that was used in this experiment allowed no visual contact but vocal communication was possible between the animaIs and lasted four hours. This caused a rise in the plasma {3-endorphin levels soon after the beginning of the stress procedure and a depression of the plasma LH leyels. Intravenous injection of naloxone (1 mg/kg) was capable of disinhibiting the LH response, suggesting the involvement of endogenous opioids in the control of LH during isolation stress. The isolation procedure did not significantly affect LH pulsatility. When the two stressors (hypoglycemia and isolation) were imposed together, plasma {3-endorphin concentrations Tose and plasma LH values were reduced. The LH pulse amplitude was affected suggesting a synergistic action of these two stressors on the GnRH pulse generator. When naIoxone (1 and 2 mg) was administered into the third ventricle to hypoglycemic animaIs made using insulin (1 mg/kg/i. v.) a blockade of the inhibitory effect of this stress on plasma LH concentrations was seen. However, naloxone had no effect on plasma LH when injected in animaIs under basal conditions. Plasma {3-endorphin and cortisol concentrations were depressed by i.c. v. injection of naloxone (2 mg) in hypoglycemic animais, but these hormones were not atfected in non-stressed animais. The intracerebroventricular injection of naloxone affected the LH pulse amplitude in hypoglycemic ewes. It is suggested that naloxone acts at the centraI nervous system, to regulate gonadotropin releasing hormone release in stressed animals. MenosThe studies performed in this thesis aim to clarify the effects of physiologicaI and psychologicaI stresses on the plasma concentrations of cortisol and B-endorphin and the consequent effects on gonadotropin (LH) release in long-term ovariectomized ewes. AIso, a study was made of the. endogenous opioid involvement during application of these two kinds of stressors through the use of an opioid antagonist (naloxone). In this work not only was the peripheraI effect of naloxone evaluated but also its central action on the hypothalamo-pituitary adrenal axis activity and gonadotropin (LH) release. Plasma concentrations of B-endorphin and cortisol were elevated during acute (4 hours) insulin-induced hypoglycemia (2mU/kg/min) stress while plasma LH concentrations were inhibited. Infusion of the opioid antagonist naIoxone hydrochloride (5.5ug/kg/min) blocked the inhibitory effect of B-endorphin on LH release. It was concluded that endogenous opioids are involved in the control of LH release during hypoglycemia in ovariectomized ewes. In addition, this experiment detected no effect of acute hypoglycemia on episodic LH in ovariectomized animais. However, it was possible to observe a stimulatory effect of naIoxone on the LH pulse frequency in the first two hours after the beginning of the infusion, suggesting that this antagonist has short half life. During chronic (12 hours) insulin-induced hypoglycemia (2mU/kg/min), plasma ,B-endorphin levels retumed to basal levels while plasma corti... Mostrar Tudo |
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Palavras-Chave: |
Hormônio luteinizante; LH; Secreção de hormônio. |
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Thesagro: |
Endocrinologia; Ovelha; Ovino; Reprodução Animal. |
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Thesaurus NAL: |
Animal nutrition; Animal physiology; Ewes; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 04171nam a2200265 a 4500
001 1529254
005 2019-10-23
008 1995 bl uuuu m 00u1 u #d
100 1 $aELOY, A. M. X.
245 $aStress, opioid peptides and luteinizing hormone secretion in ewes.
260 $a1995.$c1995
300 $a172 f.
500 $aThesis (Doctor of Phylosophy) - University of Leeds, Leeds.
520 $aThe studies performed in this thesis aim to clarify the effects of physiologicaI and psychologicaI stresses on the plasma concentrations of cortisol and B-endorphin and the consequent effects on gonadotropin (LH) release in long-term ovariectomized ewes. AIso, a study was made of the. endogenous opioid involvement during application of these two kinds of stressors through the use of an opioid antagonist (naloxone). In this work not only was the peripheraI effect of naloxone evaluated but also its central action on the hypothalamo-pituitary adrenal axis activity and gonadotropin (LH) release. Plasma concentrations of B-endorphin and cortisol were elevated during acute (4 hours) insulin-induced hypoglycemia (2mU/kg/min) stress while plasma LH concentrations were inhibited. Infusion of the opioid antagonist naIoxone hydrochloride (5.5ug/kg/min) blocked the inhibitory effect of B-endorphin on LH release. It was concluded that endogenous opioids are involved in the control of LH release during hypoglycemia in ovariectomized ewes. In addition, this experiment detected no effect of acute hypoglycemia on episodic LH in ovariectomized animais. However, it was possible to observe a stimulatory effect of naIoxone on the LH pulse frequency in the first two hours after the beginning of the infusion, suggesting that this antagonist has short half life. During chronic (12 hours) insulin-induced hypoglycemia (2mU/kg/min), plasma ,B-endorphin levels retumed to basal levels while plasma cortisol concentrations showed a rise, suggesting incomplete feedback of corticosteroids on ACTH. LH levels remained low even during control treatment and naloxone (5.5Jlg/kg/min) infusion was not ~ble to stimulate the release of this hormone. In this case the long absence of ovarian steroids could be responsible for the lack of naloxone response and siso for the low levels of LH during saline infusion. The isolation stress that was used in this experiment allowed no visual contact but vocal communication was possible between the animaIs and lasted four hours. This caused a rise in the plasma {3-endorphin levels soon after the beginning of the stress procedure and a depression of the plasma LH leyels. Intravenous injection of naloxone (1 mg/kg) was capable of disinhibiting the LH response, suggesting the involvement of endogenous opioids in the control of LH during isolation stress. The isolation procedure did not significantly affect LH pulsatility. When the two stressors (hypoglycemia and isolation) were imposed together, plasma {3-endorphin concentrations Tose and plasma LH values were reduced. The LH pulse amplitude was affected suggesting a synergistic action of these two stressors on the GnRH pulse generator. When naIoxone (1 and 2 mg) was administered into the third ventricle to hypoglycemic animaIs made using insulin (1 mg/kg/i. v.) a blockade of the inhibitory effect of this stress on plasma LH concentrations was seen. However, naloxone had no effect on plasma LH when injected in animaIs under basal conditions. Plasma {3-endorphin and cortisol concentrations were depressed by i.c. v. injection of naloxone (2 mg) in hypoglycemic animais, but these hormones were not atfected in non-stressed animais. The intracerebroventricular injection of naloxone affected the LH pulse amplitude in hypoglycemic ewes. It is suggested that naloxone acts at the centraI nervous system, to regulate gonadotropin releasing hormone release in stressed animals.
650 $aAnimal nutrition
650 $aAnimal physiology
650 $aEwes
650 $aSheep
650 $aEndocrinologia
650 $aOvelha
650 $aOvino
650 $aReprodução Animal
653 $aHormônio luteinizante
653 $aLH
653 $aSecreção de hormônio
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