No description available.

No description available.

No description available.

Wheat is the world’s third largest food crop, and is relied upon as a food source by millions of people. Securing the supply of wheat is a problem because it is susceptible to many biotic and abiotic factors that limit production. One such factor, sprouting of the grain in the head, because of untimely rainfall prior to harvest, is a substantial problem worldwide. Pre-harvest sprouting has a significant impact on wheat growers, who suffer considerable economic hardship as a result of yield loss during harvesting and subsequent downgrading of their sprouted crops. Wheat processors are also affected by this problem, because sprouted grain has significantly altered chemical properties, making it unsuitable for its intended purpose, and often rendering it suitable for animal consumption only. This study investigated mechanisms of dormancy, in the diploid wheat Triticum tauschii (Coss.) Schmalh., to assess their suitability for use in hexaploid (bread) wheat to prevent pre-harvest sprouting. A soluble germination inhibitor was found in the bracts (palea, lemma and glumes) surrounding the grain of T. tauschii. Fractionation of an aqueous extract from the bracts, by HPLC, identified vanillic acid as being likely to be involved in this inhibition. Further analysis of the extract also identified a strong anti-oxidant capacity, indicating that part of the inhibition of germination may arise from the prevention of oxygen reaching the embryo.

Thesis (Th. M.)--Westminster Theological Seminary, Philadelphia, 1993. / Includes bibliographical references (leaves 78-93).

Thesis--Bonn. / Vita. Abstract in English and Romanian. Includes bibliographical references (p. 171-176) and index.

"Counting Out The Harvest" is a collection of poems exploring intimate encounters. The poems reflect on encounters with memories, family, and the natural and cosmic worlds. In one of the poems, "Red-Throated Anole," the speaker works desperately to save a small dying lizard. In "Ice Storm, Post-Divorce," the speaker attempts to decipher a cluster of ladybugs taking refuge in her room. In the title poem, a couple wonders patiently if their crop will eventually grow. In each of these poems there is a present longing for the construction of a meaningful identity by means of the encounter, but the intersection between speaker and world falls short of satisfaction, whether the faultiness lies in the body's inability to find full sustenance, or in the ever-changing fluidity of memory to find stability. But the poems progress from pressing against this difficulty toward finding a contented resignation to the world's cyclical order. The final line of the manuscript, "disrobe a layer to begin again," indicates an arrival at satisfaction, which is found ultimately in continuation.

No description available.

This project evaluated the potential for using ozone gas as post-harvest treatment for control of disease in stored potatoes. Ozone is a short-lived, highly reactive oxidizing agent with demonstrated potential to control disease-causing microorganisms. Preliminary trials showed that the atmospheric concentration of ozone obtained using commercial ozone generation equipment depended on the room size and reactive demands in the treatment area. Ozone applied to freshly harvested seed-grade potatoes up to 0-20 mg O3/kg/hr for 1, 7 or 21 days had little significant effect on the incidence or severity of a range of diseases or tuber colour, but did increase tuber weight loss in a dosage-dependant manner. Continuous ozone application (1.9 mg O3/kg/hr) accentuated weight loss by the stored crop. Application of ozone (10-20 mg O3/kg/hr) and Purogene® (Chlorine dioxide; 200 ppm) for 1 day at the mid-point of the winter storage period had no effect on disease levels, skin colour or weight loss measured at the end of storage. When tubers were inoculated with a range of pathogens (Fusarium sambucinum, F. solani., Phytophthora infestans, Helminthosporium solani), introduced at wound depths appropriate to each disease, disease levels typically increased, however ozone treatment (20 mg O3/kg/hr) did not reduce development of any of these diseases. In the absence of potential interference by the surrounding storage environment, pure cultures of Fusarium spp., P. infestans and sclerotia of Sclerotinia sclerotiorum were exposed to 45 mg O3/plate/hr for 1 or 2 days. The ozone treatments had no effect on sporulation of any of the pathogens and did not reduce mycelial growth of Fusarium spp. Mycelial growth of Phytophthora and sclerotial germination of Sclerotinia were suppressed for the duration of the ozone treatment period, however normal growth resumed when the cultures were placed in ozone-free conditions. Ozone treatments (up to 320 mg O3/kg/hr for 2 days) did not reduce the sprouting ability of seed potatoes, however ozone treatments (~20 mg O3/kg/hr for 1, 7 or 21 days) significantly reduced wound periderm thickness of treated potatoes. Treating seed potatoes with ozone (0 or 20 mg O3/kg/hr for 1 or 2 days) prior to planting typically did not affect plant stand or yield, however under cool, wet conditions, ozone-treated seed potatoes produced poorer stands and yields relative to the controls. Based on the results obtained for the range of treatments evaluated in this project, ozone appears to have limited potential as a disease management tool in stored potatoes.

This project evaluated the potential for using ozone gas as post-harvest treatment for control of disease in stored potatoes. Ozone is a short-lived, highly reactive oxidizing agent with demonstrated potential to control disease-causing microorganisms. Preliminary trials showed that the atmospheric concentration of ozone obtained using commercial ozone generation equipment depended on the room size and reactive demands in the treatment area. Ozone applied to freshly harvested seed-grade potatoes up to 0-20 mg O3/kg/hr for 1, 7 or 21 days had little significant effect on the incidence or severity of a range of diseases or tuber colour, but did increase tuber weight loss in a dosage-dependant manner. Continuous ozone application (1.9 mg O3/kg/hr) accentuated weight loss by the stored crop. Application of ozone (10-20 mg O3/kg/hr) and Purogene® (Chlorine dioxide; 200 ppm) for 1 day at the mid-point of the winter storage period had no effect on disease levels, skin colour or weight loss measured at the end of storage. When tubers were inoculated with a range of pathogens (Fusarium sambucinum, F. solani., Phytophthora infestans, Helminthosporium solani), introduced at wound depths appropriate to each disease, disease levels typically increased, however ozone treatment (20 mg O3/kg/hr) did not reduce development of any of these diseases. In the absence of potential interference by the surrounding storage environment, pure cultures of Fusarium spp., P. infestans and sclerotia of Sclerotinia sclerotiorum were exposed to 45 mg O3/plate/hr for 1 or 2 days. The ozone treatments had no effect on sporulation of any of the pathogens and did not reduce mycelial growth of Fusarium spp. Mycelial growth of Phytophthora and sclerotial germination of Sclerotinia were suppressed for the duration of the ozone treatment period, however normal growth resumed when the cultures were placed in ozone-free conditions. Ozone treatments (up to 320 mg O3/kg/hr for 2 days) did not reduce the sprouting ability of seed potatoes, however ozone treatments (~20 mg O3/kg/hr for 1, 7 or 21 days) significantly reduced wound periderm thickness of treated potatoes. Treating seed potatoes with ozone (0 or 20 mg O3/kg/hr for 1 or 2 days) prior to planting typically did not affect plant stand or yield, however under cool, wet conditions, ozone-treated seed potatoes produced poorer stands and yields relative to the controls. Based on the results obtained for the range of treatments evaluated in this project, ozone appears to have limited potential as a disease management tool in stored potatoes.