7th Drug hypersensitivity meeting: part two

No abstract availabl

Comparative response to N, P and K of grain sorghum and corn: I. Distrophic quartz sand

Em urn solo classificado como Areia Quartzosa Distrófica (AQd) de Anhembi, SP, foi estudada a resposta de três cultivares de sorgo granífero (E-57, TEY-101 e C-102) e de milho (HMD-7974, Centralmex e Piranão) à adubação nitrogenada, fosfatada e potássica e à adição de uma mistura contendo micronutrientes. Durante o de senvolvimento foram colhidas amostras de folhas para análise mineral. A análise dos dados permitiu tirar as seguintes conclusões principais: 1. as produções do sorgo foram maiores que as obtidas com o milho, quer se considerem as médias de todos os tratamentos ou a colheita correspondente ã dose maior de adubo (150 kg de N, 200 de P(2)0(5) e 150 kg de K(2)0 por ha); 2. as variedades tanto de sorgo quan to de milho mostraram capacidades diferentes para absorver N e P do solo e para responder à adubação empregada ; 3. não houve resposta à adubação potássica; 4. somente a cv. Piranão respondeu à adição de micronutrientes; 5. foram encontradas relações diretas entre dose de N e P2O5 aplicada, colheita e teor do elemento correspondente, o que permitiu estabelecer níveis críticos fisiológicos para a avaliação do estado nutricional; 6. estabeleceram-se os teores foliares dos macronutrientes secundários (Ca, Mg e S) e dos micronutrientes catiônicos que indicam nutrição mineraladequada.The comparative response of three sorghum (E-57, TEY 101 and C- 102) and of three corn cultivars (HMD-7974, Centralmex and Piranão) to N, P and K applications was studied in a soil from Anhembi, SP, classifield as Distrophic quartz sand (AQd) was studied. Leaf analyses were made to assess the nutritional status of the two crops. Main conclusions were the following. 1. Sorghum yieldel more than corn; 2. Both sorghum and corn varieties showed different capacities to absorb N, P and K from the soil and to fertilizer application; 3. There was no response to K2O fertilization; 4. Only Piranão increased yield when suplemented with a mixture of micronutrientes; 5. Direct relationships between rates of N and P2O5 and yield and leaf content were found; 6. Direct relationships between rates of N and P2O5 and yield and leaf content were found; 7. The following leaf levels were considered to be adequate, respectively for sorghum and corn: N - 2,00 - 2,25%, 3,25 - 3,50%; P - 0,30 - 0,40, 0,45 - 0,50; K -2,00 - 2,50, 2,20 - 2,40%; Ca - 0,20 - 0,40, 0,44- 0,72% Mg - 0,25 - 0,40, 0,34 - 0,60%; S - 0,50 - 0,70, 0,72 -0,80; Cu - 7 - 10, 11 - 15%; Fe - 84 - 170, 98 - 125%; Mn - 58 - 72, 66 - 85%; Zn - 10 - 14, 18 - 22; critical levels, however, do very depending upon cultivar

Removal of Cd(II) from Aqueous Solution Using Blue Pine Sawdust: Equilibrium, Kinetics and Thermodynamic Studies

The adsorption of Cd(II) ions onto sawdust has been investigated in detail as a function of equilibration time (1-120 min), dosage of adsorbent (0.025-0.5 g)/10 ml, concentration of Cd(II) (9-1780 mu M) and of nature (pH 1-10). Maximum adsorption (ca. 95.3%) is achieved from deionised water in 30 minutes at pH 7 using 0.2 g adsorbent/10 ml adsorbate solution. The adsorption data follow Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherms over the entire range of Cd(II) ions concentration examined and their characteristic constants have also been evaluated. The variation of adsorption with temperature has yielded Delta H, Delta S and Delta G values for the 18 mu M cadmium concentration. The kinetics of adsorption obeys Morris-Weber and Lagergren equations. The first order rate constant and the intraparticle diffusion rate have also been estimated. Sawdust appears to have potential to remove Cd(II) ions from aqueous solutions at trace or subtrace concentration, to preconcentrate or treat industrial wastewater