O cobalto na nutrição vegetal, animal e humana
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O cobalto � um elemento ben�fico para o crescimento das plantas superiores, mas � essencial para a nodula��o das leguminosas e a fixa��o do azoto atmosf�rico. A adi��o de baixos n�veis de cobalto aumenta o rendimento do crescimento das plantas, bem como a qualidade dos frutos, enquanto uma concentra��o elevada de cobalto exerce efeitos nocivos. Em solos recentemente recuperados e em condi��es de escassez de �gua, o cobalto ajuda as plantas a resistir ao stress causado pela salinidade, pelas altas temperaturas e pela falta de �gua, tendo demonstrado ter um efeito promotor nos par�metros de crescimento e no rendimento obtido. No que diz respeito aos solos do Egito, pode afirmar-se que os solos recentemente recuperados t�m um baixo teor de cobalto, exceto os salinos, que apresentam uma elevada concentra��o, mas principalmente na forma n�o dispon�vel. Os animais necessitam de cobalto como constituinte da vitamina B12. O cobalto � um constituinte alimentar essencial para ovinos, bovinos, caprinos e vacas. A defici�ncia de cobalto �, na verdade, uma defici�ncia de vitamina B12. Os microrganismos no r�men s�o capazes de sintetizar vitamina B12 nos ruminantes se a dieta tiver cobalto adequado. Nos seres humanos, o cobalto � essencial para a produ��o de c�lulas sangu�neas. Encontra-se em tecidos adultos, tais como cora��o, c�rebro, est�mago, ossos, pele, cabelo, suco pancre�tico, rins, plasma e urina.
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