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Plant Sciences

Plant Physiology

Theses/Dissertations

1947

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Diffusion Through Multiperforate Septa , Jacob Verduin Jan 1947

Diffusion Through Multiperforate Septa , Jacob Verduin

Retrospective Theses and Dissertations

Diffusion through multiperforate septa was investigated, using two series of septa and three types of diffusion with the object of attempting to formulate an interference equation;A simple derivation of small-pore diffusion is presented which indicates that spheroidal uniform pressure surfaces yield diffusion rates showing proportionality with pore diameter;The experiments and empirical interference equation of Huber were analyzed and found to be unreliable because he failed to measure interference as an isolated variable;A theoretical interference equation is derived which shows that interference between pores of constant size, uniformly spaced in a septum, should be inversely proportional to the ...


Physiological Action Of 2,4-Dichlorophenoxyacetic Acid On Dandelion (Taraxacum Officinale) , Lowell W. Rasmussen Jan 1947

Physiological Action Of 2,4-Dichlorophenoxyacetic Acid On Dandelion (Taraxacum Officinale) , Lowell W. Rasmussen

Retrospective Theses and Dissertations

The effect of 2,4-dichlorophenoxyacetic acid on the composition and activity of dandelion roots was studied, using three concentrations (120, 480, and 1920 ppm.) of 2,4-D in aqueous sprays. Root samples were taken before treatment and at five day intervals for 25 days after treatment. Determinations were made of the content of reducing sugar, sucrose, dextrin, levulin, alcohol soluble nitrogen, and protein nitrogen in the roots. Measurements of the rate of respiration were also made;The reducing sugar content was increased rapidly by the treatments, but later decreased towards the level of the control. It was found that the ...