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In re Requena.
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Medical ethics in the courtroom: the need for scrutiny.
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Medical treatment for older people and people with disabilities: 1986 developments. National Legal Center Staff.
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The significance of the legacy of Karen Ann Quinlan.
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In the matter of Beverly Requena.
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The moral significance of institutional integrity.
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At law. Transferring the ethical hot potato.
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Different nitrogen sources modulate activity but not expression of glutamine synthetase in arbuscular mycorrhizal fungi.
Glutamine synthetase (GS) is a central enzyme of nitrogen metabolism that allows assimilation of nitrogen and biosynthesis of glutamine. We isolated the cDNA encoding GS from two arbuscular mycorrhizal fungi, Glomus mosseae (GmGln1) and Glomus intraradices (GiGln1). The deduced protein orthologues have a high degree of similarity (92%) with each other as well as with GSs from other fungi. GmGln1 was constitutively expressed during all stages of the fungal life cycle, i.e., spore germination, intraradical and extraradical mycelium. Feeding experiments with different nitrogen sources did not induce any change in the mRNA level of both genes independent of the symbiotic status of the fungus. However, GS activity of extraradical hypahe in G. intraradices was considerably modulated in response to different nitrogen sources. Thus, in a N re-supplementation time-course experiment, GS activity responded quickly to addition of nitrate, ammonium or glutamine. Re-feeding with ammonium produced a general increase in GS activity when compared with hyphae grown in nitrate as a sole N source.