Samuel Roberts

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Much of the pathogenic success of Phytophthora infestans, the potato and tomato late blight agent, relies on its ability to generate from mycelia large amounts of sporangia, which release zoospores that encyst and form infection structures. To better understand these stages, Affymetrix GeneChips based on 15,650 unigenes were designed and used to profile the(More)
3 H– L -Phenylalanine is incorporated into a range of phenylpropanoid compounds when fed to tobacco cell cultures. A significant proportion of 3 H– trans -cinnamic acid formed from 3 H– L -phenylalanine did not equilibrate with exogenous trans -cinnamic acid and therefore may be rapidly channeled through the cinnamate 4-hydroxylase (C4H) reaction to(More)
A study of the effect of inhibitors on zoospore development in Phytophthora infestans demonstrated the involvement of protein kinases and calcium and led to the discovery of a gene induced during zoosporogenesis that encoded a protein resembling Ca2+- and calmodulin-regulated serine/threonine protein kinases. The calcium channel blocker verapamil and the(More)
McCoy and Snyder (1950) reported a method of analysis for five of the B vitamins using Streptococcus faecalis (strain ATCC 6057). This organism was reported by Gunsalus and Umbreit (1945) to have the ability to oxidize glycerol. Since this particular strain showed an excellent potentiality for analysis of extremely minute amounts of physiologically active(More)
Conventional spacecraft subsystems are designed and manufactured separately, and are integrated only during the final stages of satellite development. This requires containers for the subsystems’ hardware, mechanical interfaces, panels, frames, bulky wire harnesses, etc., which add considerable mass and volume. As all subsystems are generally secured to the(More)
One of the major concerns in detecting changes in higher moments is these changes may be due to outliers or process errors that are not biologically significant. For example, a larger variance observed in the expression levels may simply due to the larger variation in the data collecting process. Several outliers, which exhibit some extreme expression(More)
The shikimate pathway consists of seven enzymatic reactions whose end product chorismate is the precursor for the synthesis of the aromatic amino acids Phe, Tyr and Trp. In fungi and plants, chorismate is a precursor for many specialised metabolites (i.e. secondary metabolites) that play an important role in the plant’s interaction with its environment. The(More)
Chloride (Cl) as a yield and growth-limiting nutrient has been the object of experimental attention for the last several decades. Long-term experiments were conducted from 1996 to 2002 at Hennessey and Perkins, Oklahoma to evaluate the response of winter wheat grain yield and nitrogen (N) uptake to 0, 15 and 30 kg Cl ha rates. A randomized complete block(More)
Million Tadege,a,b,1 Hao Lin,b Mohamed Bedair,a Ana Berbel,c Jiangqi Wen,a Clemencia M. Rojas,a Lifang Niu,b Yuhong Tang,a Lloyd Sumner,a Pascal Ratet,d Neil A. McHale,e Francisco Madueño,c and Kirankumar S. Mysorea a Plant Biology Division, The Samuel Roberts Noble Foundation, Ardmore, Oklahoma 73401 b Department of Plant and Soil Sciences, Oklahoma State(More)