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| Gondim,Antonio Nei Santana; Oliveira,Vanda Rodrigues de; Santos,Sellyanna Domeny dos; Silva,Bagnólia Araújo da; Vasconcelos,Carla Maria Lins de; Conde-Garcia,Eduardo Antonio. |
| The negative inotropic effect of aqueous fraction (AqF) obtained from the acetic extract of Psidium guajava L leaf was investigated on the guinea pig left atrium. Myocardial force was measured isometrically (27 ± 0.1 ºC, 2 Hz). AqF (100 μg/ml) reduced contractility of about 85 ± 9.4 % (n = 4, p < 0.001, Fcalc = 51.70, F(0.01; 4; 21) = 5.09, EC50 = 14.28 ± 3 μg/mL) in a concentration-dependent fashion. This effect was reduced by 20 mM of tetraethylammonium (TEA), increasing EC50 to 50 ± 7 μg/ml (n = 4, p < 0.001, Fcalc = 282.13; F(0.01; 21; 66) = 2.36). AqF (100 μg/ml) shifted to the right the CaCl2 concentration-effect curve, increasing the EC50 from 2170 ± 112 to 2690 ± 132 μM (n = 3, p < 0.001, Fcalc = 220.80 ; F(0.01; 29; 60) = 2.19). L-NAME... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Psidium guajava/acetic extract; Psidium guajava/inotropic effect; Inotropic effect/experimental study; Myocardium/contraction; Myocardium/experimental studies; Myocardial cells; Experimental studies. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502009000300014 |
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| Xie,Shengshi; Wang,Chunguang; Deng,Weigang. |
| ABSTRACT For the purpose of achieving the distribution of the potato-soil mixture and the appropriate parameters of the swing separating sieve, we conducted experiments using the 4SW-170 potato digger. The experiments consisted of two parts. In each part, the experimental factors were crank rotational speed, sieve inclination and machine forward speed. The difference is that the first part involved a single factor test, which selected the coverage of the potato-soil mixture as the evaluation indicator. In contrast, the second part involved an orthogonal test, which selected the obvious rate and damage rate as evaluation indexes. In the first part, it was observed that the coverage of the potato-soil mixture on the separating sieve reduced gradually with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Swing separating sieve; Coverage of potato-soil mixture; Parameter optimization; Experimental studies. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000400548 |
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| Yesuf, Mahmud; Bluffstone, Randall. |
| Production systems in low-income developing countries are generally poorly diversified, focusing on rainfed staple crop production and raising livestock. These activities are inherently risky and investment and production decisions by farm households are therefore made within environments that are affected by risk. Because of poorly developed or absent credit and insurance markets it is difficult to pass any of these risks to a third party. As a result, it is often found that even when the expected net return is high, households are reluctant to adopt new agricultural technologies when they involve risk. Better understanding risk behavior will be essential for identifying appropriate farm-level strategies for adaptation to climate change by low-income... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Ethiopian farm households; Experimental studies; Loss aversion; Risk aversion; Risk and Uncertainty. |
| Ano: 2007 |
URL: http://purl.umn.edu/42398 |
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