900 research outputs found
Combating stem and leaf rust of wheat: Historical perspective, impacts, and lessons learned
No full textmillions fed, food security, wheat rust, stem rust, leaf rust, Norman Borlaug,
Figments of Imagination v. 4 (1996: Spring): 42
No full textPoem "Dawning of Another Day" by Nicole Rus
The Thread of Spirit
No full textNicole Rust’s profile “The Thread of Spirit” concentrates mostly on the biographical elements of Russell Brown’s life. For example, the author writes, “At a very young age Father Russ had established a genuine love for people. Constantly taking notes, he paid attention to every detail in the world around him.” Do these elements come together to create a cohesive depiction of Father Russ, or are there gaps that you would like to see filled?
How does Rust incorporate the title of her essay into the content? As a reader, can you determine what “The Thread of Spirit” means to Father Russ? What does someone typically visualize when he/she thinks of a priest? Does Rust’s profile challenge any common conceptions of a priest’s life? If yes, then what is challenged? Examine the transitions between paragraphs. For instance, Russ ends paragraph four mentioning how Father Russ began his “faith journey,” and she transitions into her fifth paragraph with the same key phrase, “This ‘faith journey’ ” continued after two years. . . .”Focus on other transitions and determine if they move the essay forward effectively
Bean rust
No full textTitle from PDF caption (viewed on August 3, 2017).This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Mode of access: Internet from the Oregon Government Publications Collection.Text in English
Balanced Increases in Selectivity and Tolerance Produce Constant Sparseness along the Ventral Visual Stream
No full textAlthough popular accounts suggest that neurons along the ventral visual processing stream become increasingly selective for particular objects, this appears at odds with the fact that inferior temporal cortical (IT) neurons are broadly tuned. To explore this apparent contradiction, we compared processing in two ventral stream stages (visual cortical areas V4 and IT) in the rhesus macaque monkey. We confirmed that IT neurons are indeed more selective for conjunctions of visual features than V4 neurons and that this increase in feature conjunction selectivity is accompanied by an increase in tolerance (“invariance”) to identity-preserving transformations (e.g., shifting, scaling) of those features. We report here that V4 and IT neurons are, on average, tightly matched in their tuning breadth for natural images (“sparseness”) and that the average V4 or IT neuron will produce a robust firing rate response (>50% of its peak observed firing rate) to ∼10% of all natural images. We also observed that sparseness was positively correlated with conjunction selectivity and negatively correlated with tolerance within both V4 and IT, consistent with selectivity-building and invariance-building computations that offset one another to produce sparseness. Our results imply that the conjunction-selectivity-building and invariance-building computations necessary to support object recognition are implemented in a balanced manner to maintain sparseness at each stage of processing.National Eye Institute (Grant 1F32EY018063)National Eye Institute (Grant R01EY014970)McKnight Endowment Fund for Neuroscienc
An ecophysiological approach to crop losses exemplified in the system wheat, leaf rust, and glume blotch
No full textThe motive of the author to embark upon the research reported here was the need to develop new concepts to approach the problem of crop losses, and eventually the problem of their prevention by means of disease control and plant breeding. The introduction of ecophysiology as an approach, explained above, was the first result. An ecophysiological treatment of processes like growth and development of plants in health and disease necessitates adjustments of current thoughts on experimental techniques and on organization in research (Van der Wal and Cowan, 1974).In order to measure plant or aegricorpus responses concurrently with environmental factors in climate chamber and field experiments during periods Of months, a great variety of instruments had to be bought, modified, or devised. The climate chamber had to be adjusted to allow for high light intensities with a view to growing wheat under conditions approximating those of early summer in the Netherlands; the yield of the spring wheat 'Kolibri' was c. 0.5 kg.m -2, which is nearly equivalent to the average field production of the country. Regulations for the prevention and control of contamination by aphids and mildew without any use of chemicals were issued after detailed experimentation (Van der Wal, unpubl.). Several instruments have been developed, usually with the help of others; this has led to two publications (Schurer and Van der Wal, 1972; Tegelaar and Van der Wal, 1974). These efforts resulted in the experimental designs described in the appendix. Field experiments, conducted in the same period as the climate chamber experiments reported here, will be published later. It is felt that the techniques to record growth of pathogens are still inadequate.The results reported in the appendix show that the 'state' of the plant at the time of infection is a major determinant of the plant's future behaviour, which plant breeders and pathologists can express in terms of resistance and tolerance. The conceptual framework presented above may contribute to a future revision of crop husbandry and crop protection practices
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