Ionic Antagonism
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Prospección de las combinaciones de herbicidas para prevenir malezas tolerantes y resistentes al glifosato
The intense use of glyphosate in Argentina has increased the spread of weeds with tolerance to this herbicide, like Ipomoea nil. Cases of weed resistance to ALS inhibitors were documented in Argentina with Amaranthus quitensis. Likewise, in Brazil, it has increased weed resistance to glyphosate in weeds such as Lolium multiflorum and Euphorbia heterophylla.
Planta Daninha. Publicado em: 2010
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2. PHYSIOLOGICAL EFFECTS OF MERCURY IN PLANTS OF Pfaffia glomerata (Spreng.) Pedersen / EFEITOS FISIOLÓGICOS DO MERCÚRIO EM PLANTAS DE Pfaffia glomerata (Spreng.) Pedersen
Mercury (Hg) is a highly toxic non-essential heavy metal. Soil, water and air contamination by Hg leads to its accumulation in fish, birds and mammals, thus entering human food. Due to the hazardous effects to the ecosystem, it is necessary that contaminated soils be rehabilitated. Phytoremediation is a cheap technique that can be utilizated with this object
Publicado em: 2009
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3. Nonspecific Ionic Inhibition of Ethambutol Binding by Mycobacterium smegmatis
Magnesium sulfate and spermidine were tested for their effects on binding of 14C-ethambutol by Mycobacterium smegmatis. Concentrations were used that protected the organism from ethambutol inhibition. Sodium salts were examined as possible ethambutol antagonists to test the previously reported specificity of the divalent cation salt effect. Consistent with g
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4. Effects of mono and divalent cations on total and partial reactions catalysed by pig kidney Na,K-ATPase.
Interactions of Na, K, Ca and Mg ions with partially purified Na,K-ATPase from pig kidneys were investigated using as a tool simultaneous determinations of adenosine 5'-triphosphate (ATP)-adenosine 5'-diphosphate (ADP) exchange and ATPase activity catalysed by the enzyme. In the presence of 120 mM-NaCl and 0.5 mM-MgCl2, the effects 12 mM-KCl on ATP-ADP excha
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5. The action of N-methyl-D-aspartic acid on mouse spinal neurones in culture.
Neurones from the ventral half of mouse embryo spinal cord were grown in dissociated culture and voltage clamped. The current-voltage relation of responses evoked by N-methyl-D-aspartic acid (NMDA), L-glutamic acid and kainic acid was recorded in media of different ionic composition. On removal of Mg2+ from the extracellular solution, responses to NMDA and L
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6. 5-Hydroxytryptamine decreases the sensitivity of nicotinic acetylcholine receptor in bull-frog sympathetic ganglion cells.
The post-synaptic effects of 5-hydroxytryptamine (5-HT) were examined in neurones of bull-frog sympathetic ganglia with intracellular micro-electrode and voltage-clamp recording techniques. Atropine (1 microM) was used to block the muscarinic cholinoceptors. 5-HT reduced the amplitude of the fast excitatory post-synaptic potential (fast e.p.s.p.). 5-HT also
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7. Dynamically Driven Ligand Selectivity in Cyclic Nucleotide Binding Domains*
One of the mechanisms that minimize the aberrant cross-talk between cAMP- and cGMP-dependent signaling pathways relies on the selectivity of cAMP binding domains (CBDs). For instance, the CBDs of two critical eukaryotic cAMP receptors, i.e. protein kinase A (PKA) and the exchange protein activated by cAMP (EPAC), are both selectively activated by cAMP. Howev
American Society for Biochemistry and Molecular Biology.
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8. Ionic basis of the hyperpolarizing action of adenyl compounds on sinus venosus of the tortoise heart.
The ionic mechanism underlying the hyperpolarizing action of adenosine and adenine nucleotides was studied by measuring the efflux of 43K or 86Rb from sinus venosus and interauricular septum of tortoise heart. Preparations rendered quiescent by high-K (27 mM) Ringer solution were used. Adenosine and ATP increased the efflux of 43K and 86Rb from sinus venosus
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9. Block of current through T-type calcium channels by trivalent metal cations and nickel in neural rat and human cells.
1. The effects of the trivalent cations yttrium (Y3+), lanthanum (La3+), cerium (Ce3+), neodymium (Nd3+), gadolinium (Gd3+), holmium (Ho3+), erbium (Er3+), ytterbium (Yb3+) and the divalent cation nickel (Ni2+) on the T-type voltage gated calcium channel (VGCC) were characterized by the whole-cell patch clamp technique using rat and human thyroid C cell line
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10. A patch clamp study of the nicotinic acetylcholine receptor of bovine adrenomedullary chromaffin cells in culture.
1. Acetylcholine-induced currents recorded from bovine adrenal medullary chromaffin cells maintained in culture were studied during pressure or ionophoretic applications of ACh, using the 'whole-cell' and 'outside-out' configurations of the patch clamp technique. In standard salines, ACh evoked whole-cell currents of -38 pA to -1 nA at -60 mV, which had a re