Download Applications of Continuous and Steady-State Methods to Root by D. B. Layzell, S. Hunt, B. J. King (auth.), John G. Torrey, PDF

By D. B. Layzell, S. Hunt, B. J. King (auth.), John G. Torrey, Lawrence J. Winship (eds.)

This ebook presents a very good representation of the interrelationship among growth in medical technique and conceptual advances, and its publica­ tion may still give a contribution to additional advances. it truly is renowned that significant advances in figuring out frequently keep on with the advance of latest tools. the advance of the acetylene aid assay for nitrogenase task offers an exceptional instance of this interrelationship among concept and techniques. Theoretical wisdom ended in a look for substrates for nitro­ genase which may be assayed for extra simply than ammonium, the traditional made from the enzyme. the invention of the aid of acetylene to ethylene by way of nitrogenase supplied the precise solution to the matter by means of provid­ ing a speedy, particular, nondestructive, and cheap assay for nitrogenase job. This assay is now utilized by virtually each laboratory doing study on nitrogen fixation. in spite of the fact that, extra use and improvement of the acetylene aid assay has proven that it may underestimate nitrogenase task and will even supply wrong relative values less than a few conditions. the most important challenge is that publicity of legume nodules to acetylene could cause a wide bring up within the resistance to oxygen diffusion into the nodule. This lowered offer of oxygen decreases the speed of nitrogenase task inside of a couple of minutes.

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1986) and aeroponically grown soybean (solid circles; using data from Weisz and Sinclair 1987a). 10 , The resultant estimates of Po for these intact, undisturbed soybean nodules are also presented in Fig. 1. The estimates of Po for aeroponicaJIy grown soybean nodules using nodule oxygen uptake are very similar to those reported by Minchin et al. (1986) for pot-grown soybean and those reported by Sheehy et al. (1983) for white clover. As in white clover, Po varied with the external oxygen concentration and a nearly constant nodule respiration rate was maintained over a wide range of Oex.

3. Lag-Phase Method Both of the previous two assay procedures using a diffusion barrier model rely heavily on biochemical assumptions about nodule activity. The respiration model invoked assumptions about the distribution of respiratory sites, and when CO 2 flux density was measured, assumptions about the RQ value. The combined model relied upon assumptions required to evaluate KM. Obviously, a more desired assay would be one that measured directly the magnitude of the diffusion barrier permeability without requiring any biochemical assumptions.

L100 t Ar ::a. : z 0~-~0~-~--4~0~-~-~80~-~-~12~0-~0 TIME (minutes) 20 kPaO. I z 0 t ~ 300 B I" 30kPa O2 , N. ,1 , ,--' ~ c , Q Q. l H2' \ in N2 'Ar :' \ , I : \ 200 , "tJ .!. :1:1 ~ Ar 0 0 Z C 0 ::I" i5 z :1:1 100 () s> !. 2. , , \ 3: 200 . ~~? . f... \.... 0 in ! \ I ..... ·;~>N2 a: i :J Q 300 N2 ~ ____L -_ _ 20 TIME 40 ~ _ _-JO 60 (minutes) Fig. 11. (A) H2 evolution (solid and dashed lines) and CO 2 evolution (dotted line) from a nodulated root of soybean following changes between N 2 :02 (80:20) and Ar:O z (80:20) atmospheres.

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