Effect of Hardness of Water on the Fungicidal Value of Mercuric Chloride Solutions

A comparison of the fungicidal value of mercuric chloride solutions made up in tap water with those made up in distilled water showed that the tap water solutions were much less effective in killing the sclerotia of Rhizoctonia solani on potato tubers. Of the 182 sclerotia treated with bichloride, 1-1000 in distilled water, only 6 or 1.1 per cent grew. In the case of a similar treatment of tap water solution of the 139 sclerotia examined, 34 or 7.1 per cent grew. Ninety per cent of untreated sclerotia grew in the control experiments. These facts are important in the application of seed treatments where the grower uses hard water in making up disinfecting solutions

NASA SBIR abstracts of 1990 phase 1 projects

The research objectives of the 280 projects placed under contract in the National Aeronautics and Space Administration (NASA) 1990 Small Business Innovation Research (SBIR) Phase 1 program are described. The basic document consists of edited, non-proprietary abstracts of the winning proposals submitted by small businesses in response to NASA's 1990 SBIR Phase 1 Program Solicitation. The abstracts are presented under the 15 technical topics within which Phase 1 proposals were solicited. Each project was assigned a sequential identifying number from 001 to 280, in order of its appearance in the body of the report. The document also includes Appendixes to provide additional information about the SBIR program and permit cross-reference in the 1990 Phase 1 projects by company name, location by state, principal investigator, NASA field center responsible for management of each project, and NASA contract number

Illustrations of the Fleshy Fungi of Iowa I. The Purple-Brown Spored Agarics

One of the functions of the Iowa Academy of Science is to acquaint ourselves with the flora and fauna of our state and to make record of the occurrence of plants or animals which have some peculiarly desirable or undesirable character which makes them noteworthy. We have many papers and scattered references to the fungus flora of the state, but at no time have adequate illustrations of the fleshy-fungi occurring here been published. I propose, therefore, to gather into this series of notes illustrations of the more common fleshy-fungi of Iowa in order that the interested membership may become more familiar with this group of plants. There is little or no research value in this contribution but I hope that the publication will afford the interested worker a criterion for comparison with his own collections and a means of identification of specimens when such are found

Measure of the size of CP violation in extended models

In this letter we introduce a possible measure of the size of CP violation in the Standard Model and its extensions, based on quantities invariant under the change of weak quark basis. We also introduce a measure of the ``average size'' of CP violation in a model, which can be used to compare the size of CP violation in models involving extra sequential or vector-like quarks, or left-right symmetry.Comment: LaTeX, 7 pages, no figure

An Improved Method of Potato Seed Treatment

Half of the seed potatoes that are planted each spring are infected with some plant disease. Black leg, Black scurf, Common scab, and Dry rots are the commonest of these diseases. They cut down the stand, injure the roots, mar the potatoes and reduce the yield. Illustration on cover shows the seed potatoes from a 2 1/2 bushel sack bought in the open market, sorted into two lots: those free from disease and those not free. Note that there are more diseased potatoes than healthy ones. \u27!\u27his is not an unusual case; in fact, it is somewhat better than the average. Such potatoes can be made into good seed by treating them, but seed treatment will not make good seed out of culls. The little potatoes and those badly diseased should be discarded for seed purposes

A Fusarium Following Frost-Injury of Robinia

In the fall of 1935 a number of specimens of seedlings of Robinia pseudo-acacia L. were submitted to the Department of Botany of Iowa State College for the investigation of a canker which was girdling the sterns of these plants at or about the ground line. On a majority of the specimens examined, the injury consisted of a sunken area approximately two centimeters in length completely surrounding the stem. The wood under these cankers was materially browned and the cambium was dead. Many of these cankers were covered with orange sporodochia of a fungus which microscopic examination proved to be a member of the genus Fusarium. A survey of the extent of the disease was made and the identity of the fungus and its relationship as a possible factor in the causation of the canker was investigated

Observations on mold development and on deterioration in stored yellow dent shelled corn

Examinations during 3 consecutive years were made in Iowa for mold development in yellow dent shelled corn stored in steel bins of 1,000-2,740 bushel capacities. The first was made during August and September 1941, the second in March 1942 and the third in April 1943. Different bins were examined in each of the three inspections. Bins reportedly containing some corn of 14 percent or more moisture were examined and probed in the first examination, those with corn of 13.5 percent or more moisture in the second examination; no selection of bins for moisture content was made in the third examination. All of the bins examined had been filled during the fall previous to sampling

On a zero speed sensitive cellular automaton

Using an unusual, yet natural invariant measure we show that there exists a sensitive cellular automaton whose perturbations propagate at asymptotically null speed for almost all configurations. More specifically, we prove that Lyapunov Exponents measuring pointwise or average linear speeds of the faster perturbations are equal to zero. We show that this implies the nullity of the measurable entropy. The measure m we consider gives the m-expansiveness property to the automaton. It is constructed with respect to a factor dynamical system based on simple "counter dynamics". As a counterpart, we prove that in the case of positively expansive automata, the perturbations move at positive linear speed over all the configurations