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Heliantheae Of Iowa. I, M. Rae Johns
Heliantheae Of Iowa. I, M. Rae Johns
Proceedings of the Iowa Academy of Science
Heliantheae is one of the nine tribes of the Family Compositae. It is believed to have originated in South America soon after the appearance of the Family and may be regarded as the oldest and most primitive of the tribes.
Fruit Size And Shape Genes On The First Chromosome Of The Tomato, E. W. Lindstrom
Fruit Size And Shape Genes On The First Chromosome Of The Tomato, E. W. Lindstrom
Proceedings of the Iowa Academy of Science
Genetic evidence has demonstrated the presence of a major factor for fruit size in the first linkage group of the tomato, linked inheritance being exhibited between fruit size and the genes for the tall-dwarf and the smooth-peach (pubescent) characters. In this same linkage group a major gene for fruit shape (ovate) has been found.
Stimulation Of Root Growth On Cuttings From Hardwood Forest Trees, G. C. Hutchings, J. A. Larsen
Stimulation Of Root Growth On Cuttings From Hardwood Forest Trees, G. C. Hutchings, J. A. Larsen
Proceedings of the Iowa Academy of Science
Certain trees and shrubs may more easily be propagated from cuttings than from seed. Others may be regenerated by root or stem layering. It is well known that new trees of willow, poplar or sycamore may readily be produced by cuttings separated from the parent tree and planted in soil or sand under favorable conditions of temperature and moisture.
Weed Succession On An Abandoned Roadway, Robert P. Adams
Weed Succession On An Abandoned Roadway, Robert P. Adams
Proceedings of the Iowa Academy of Science
In 1912, Dr. B. Shimek of the State University of Iowa, presented a paper, "An Artificial Prairie," before the Botanical Society of America. In this article, he described and explained a strip of "man-made prairie" bordering the roadway leading north from Homestead to Amana, Iowa. This road was cut in 1856 through the dense upland woods lying between the two villages and bordering the valley of the Iowa River. Its inception and maintenance provided conditions of such a xerophytic character that a typical prairie strip was produced. By means of comparison between a comprehensive list of the xerophytic plants growing …
Heights Of Weeds, L. H. Pammel, C. M. King
Heights Of Weeds, L. H. Pammel, C. M. King
Proceedings of the Iowa Academy of Science
The height to which weeds grow, depends upon geographical location, soil, and particularly precipitation, or available moisture. Weeds attain maximum growth within the area of maximum distribution.
Structure And Composition Of Pollen Grains Of Vernal Plants, Ada Hayden, J. N. Martin
Structure And Composition Of Pollen Grains Of Vernal Plants, Ada Hayden, J. N. Martin
Proceedings of the Iowa Academy of Science
Among the first morphological studies of pollen were those of Malpighi (1686) and of Grew (1675). While numerous articles on their structure and composition of pollen have been contributed, the amount of data available in application to several problems involved in such study is yet somewhat fragmentary
Some Problems In The Classification Of The Fungi, Guy West Wilson
Some Problems In The Classification Of The Fungi, Guy West Wilson
Proceedings of the Iowa Academy of Science
The variation in the method of oosphere behavior as well as the method of germination of the conidia in the Oomycetes has been a field fruitful of speculation as well as observation by mycologists. The members of this group are exceptionally susceptible to external conditions so that there is considerable diversity in reported observations and the interpretation which has been placed on them. There has also been considerable diversity of opinion as to the taxonomic value of some of the observed peculiarities.
How The College Textbooks In Botany Treat The Prairie Problem, B. Shimek
How The College Textbooks In Botany Treat The Prairie Problem, B. Shimek
Proceedings of the Iowa Academy of Science
The usual inadequate attention which is given to this subject is pointed out.
The Plant Life Of A Prairie Province In Polk County, Iowa, Winifred Gilbert
The Plant Life Of A Prairie Province In Polk County, Iowa, Winifred Gilbert
Proceedings of the Iowa Academy of Science
A brief description of the topographic features of one of the bottom prairies compared with an adjacent hillside prairie on Beaver Creek. The population given in percentages. Also an account of the plants recently migrated into the area.
The Determination Of Manganese In Potable Waters, Edward Bartow, Harris Thompson
The Determination Of Manganese In Potable Waters, Edward Bartow, Harris Thompson
Proceedings of the Iowa Academy of Science
A deposit containing manganese, found in a water pipe at the State University of Iowa led Bartow and Bailey to investigate waters of Iowa City, and to adapt the periodate method for manganese in iron, to the determination of manganese in water. Manganese in quantities above 0.1 p.p.m. is objectionable in a water supply. It deposits in the cold water pipes as a dark brown gummy sludge of the hydrous oxides, which is often so extensive as to cause complete stoppage. Manganese also incrusts the sand of filter beds, causing caking and poor backwashing of filters. Manganese stains plumbing and …
The Influence Of Solvent On The Decomposition Of Trichloracetic Acid, J. N. Pearce, A. C. Nelson
The Influence Of Solvent On The Decomposition Of Trichloracetic Acid, J. N. Pearce, A. C. Nelson
Proceedings of the Iowa Academy of Science
It is a well-known fact that the rate of a given reaction is dependent upon the temperature, upon the nature and the concentration of the reactants and upon the presence of catalysts. But that which is not so well known is the mechanism by which these different factors actually influence or modify the rate of chemical change. More particularly is this true for mono-molecular reactions the number of which is known to be relatively few.
The Heats Of Adsorption Of Organic Vapors On Charcoal At 25° And 50°, G. H. Reed, J. N. Pearce
The Heats Of Adsorption Of Organic Vapors On Charcoal At 25° And 50°, G. H. Reed, J. N. Pearce
Proceedings of the Iowa Academy of Science
The method of Pearce and McKinley, [J. Phys. Chem., 32, 360- 79 (1928)] has been used to determine the heats of adsorption of certain organic vapors on charcoal at 25 ° and 50°. The vapors used - carbon tetrachloride, chloroform and methylene chloride - were chosen with the purpose of ascertaining the possible effect both of the molecular configuration and the number and nature of the substituents upon the heat of adsorption.
A Summary Of Oxidation-Reduction Potentials, Stephen Popoff, A. H. Kunz, J. A. Riddick, W. W. Becker
A Summary Of Oxidation-Reduction Potentials, Stephen Popoff, A. H. Kunz, J. A. Riddick, W. W. Becker
Proceedings of the Iowa Academy of Science
A. ferric-ferrous electrode. B. mercuric-mercurous electrode. C. manganese dioxide electrodes.
The Influence Of Ph Values On The Oxidation Of Ferrous Sulphate, Jacob Cornog, Albert Hershberger
The Influence Of Ph Values On The Oxidation Of Ferrous Sulphate, Jacob Cornog, Albert Hershberger
Proceedings of the Iowa Academy of Science
Weighed quantities of ferrous sulfate were dissolved in buffered solutions after which the resulting buffered solutions of ferrous sulfate were aerated for three hours. The quantity of iron remaining unoxidized after three hours aeration was, in each case determined, by titrating the aerated solution with potassium permanganate solution. The degree of oxidation was found to vary both with the initial concentration of ferrous sulfate and with the pH value of the solution.
Further Studies On The Utilization Of Agricultural Wastes, Henry Gilman, R. E. Brown, J. B. Dickey, A. P. Hewlett, G. F. Wright
Further Studies On The Utilization Of Agricultural Wastes, Henry Gilman, R. E. Brown, J. B. Dickey, A. P. Hewlett, G. F. Wright
Proceedings of the Iowa Academy of Science
The syn and anti-oximes of delta-benzyl furfural have been examined in connection with sweet tasting compounds. The syn is sweeter than the anti-compound, and also sweeter than saccharine. Delta-bromofurfural has been prepared by the bromination of furfural diacetate. Organometallic compounds and derivatives from them have been prepared from 1-tetrahydro-furyl-3-bromobutane. Tetrahydrofuryl-p-toluenesulfonate has been prepared and tested for its alkylating action. A series of halogen furoic and furylacrylic acids has been prepared in antiseptic studies, and their mercury and copper salts are being tested for their possible applications as fungicides.
The Effect Of Manganese On The Growth Of Rats, V. E. Nelson, J. M. Evvard, W. E. Sewell
The Effect Of Manganese On The Growth Of Rats, V. E. Nelson, J. M. Evvard, W. E. Sewell
Proceedings of the Iowa Academy of Science
From the laboratories of Physiological Chemistry and Animal Husbandry, Iowa State College, Ames. Manganese in small amounts stimulated the growth of rats. The basal diet employed consisted of casein 18, years 12, cod liver oil 5, salts 185, 3.7, and dextrin 61.3. Manganese sulphate was fed at two levels, 100 and 600 parts per million of ration. In 56 days the control gained 1.78 grams daily and consumed 434 grams of feed per 100 of grain. On the smaller manganese allowance the gain was 2.06 grams, and the feed requirement was 391.4 grams for 100 gain. On the larger manganese …
A Study In The Ring Structure Of Methylated Sugars, Carrell A. Whitnah
A Study In The Ring Structure Of Methylated Sugars, Carrell A. Whitnah
Proceedings of the Iowa Academy of Science
The report will show that methylation of glucose with methyl sulphate and sodium hydroxide, if carried out at lower temperatures and in less alkaline solutions than usually employed, yields methylated gamma glucoside. The value of (1) the rate of oxidation by potassium permanganate and (2) the acid concentration required for hydrolysis, as tests for gamma glucosides, will also be discussed.
Some Physico-Chemical Studies Of Organo-Metallic Compounds, Henry Gilman, L. L. Heck, J. A. Leermakers
Some Physico-Chemical Studies Of Organo-Metallic Compounds, Henry Gilman, L. L. Heck, J. A. Leermakers
Proceedings of the Iowa Academy of Science
The physico-chemical properties such as molecular weight, conductivity, and absorption spectra have been determined with a miscellany of organometallic compounds in connection with studies on their dissociation, and their constitution. Also, their reactions toward oxygen, nitrous oxioe, hydrogen (catalytic with platinum) have been investigated for the same purpose as well as to test electronic structures proposed for the constitution of nitrous oxide and organometallic compounds.
The Decomposition Of The Optically Active Diazo Ester From Aminolauronic Acid, F. E. Ray, W. R. Bunting
The Decomposition Of The Optically Active Diazo Ester From Aminolauronic Acid, F. E. Ray, W. R. Bunting
Proceedings of the Iowa Academy of Science
In 1921 Levene and Mikeska, and in 1922 Noyes and Chiles prepared optically active esters in which the only asymetric carbon was that doubly bound to diazo nitrogen. The theoretical explanation being: that of the five valences of the nitrogen, four are covalences while the fifth is a Polar or ionizing valence. This may be illustrated by ammonium chloride.
Additional Significant Pleistocene Sections In Iowa, George F. Kay
Additional Significant Pleistocene Sections In Iowa, George F. Kay
Proceedings of the Iowa Academy of Science
This paper includes descriptions and interpretations of drift sections which were made available for study recently in the following places in Iowa.
The Story-Marshall Tornado Of August 20, 1928, John E. Smith
The Story-Marshall Tornado Of August 20, 1928, John E. Smith
Proceedings of the Iowa Academy of Science
This storm began in Nevada and moved eastward about twenty miles between 6:30 and 7:00 o'clock p.m. Its path, at first only two rods wide, increased somewhat irregularly as it advanced reaching a maximum of nearly 100 rods about fifteen miles from the starting point. The tornado moved north four miles in going eighteen and one-half miles east. The greatest damage was done by the storm in Nevada, and in rural districts where it crossed building sites at highway intersections as at the Lounsbury farm three miles northwest of Colo. Its destruction was most complete in the right …
The Eastern Margin Of The Hertha In Madison County, Arthur Goshorn
The Eastern Margin Of The Hertha In Madison County, Arthur Goshorn
Proceedings of the Iowa Academy of Science
Evidence was presented that The Hertha extends further east than has heretofore been reported.
Recessional Stages Between The Altamont And The Gary (?) Moraines In Iowa, John E. Smith
Recessional Stages Between The Altamont And The Gary (?) Moraines In Iowa, John E. Smith
Proceedings of the Iowa Academy of Science
Immediately following the time that the Altamont moraine was formed there was an intermittent retreat of the Wisconsin ice sheet to the position of the Gary (?) about fifty miles north-northwest of Des Moines. In Story County the distance between these moraines decreases to about thirty miles and northward from Story county it becomes as small as twenty miles in some places.
Oil Structures In Iowa, Charles Keyes
Oil Structures In Iowa, Charles Keyes
Proceedings of the Iowa Academy of Science
The smooth, illimitable prairies of our state offer to the public little encouragement for prosecuting systematic search for such forms of mineral wealth as natural gas and rock-oil. Yet, the possibilities are never absolutely negative; they are not nearly so hopeless as layman may imagine. On this score the bed-rock structures have a tale to tell that is a very different story from what might be ordinarily expected of so featureless a country. Before its prairies came lofty mountains, both within the present limits of the state and without in surrounding territory. Even the effects of the distant Rocky Mountains …
Foraminifera In The Iowa Devonian, A. O. Thomas
Foraminifera In The Iowa Devonian, A. O. Thomas
Proceedings of the Iowa Academy of Science
These microfossils were found in screenings obtained by washing some marly shales from the Cerro Gordo member of the Upper Devonian of Floyd County, Iowa. They belong to the genus Endothyra which is abundantly represented in the overlying Mississippian strata.
A Review Of The Time Factor Represented By The Stratigraphic Breaks In The Iowa Geological Column, A. O. Thomas
A Review Of The Time Factor Represented By The Stratigraphic Breaks In The Iowa Geological Column, A. O. Thomas
Proceedings of the Iowa Academy of Science
Iowa's mid-continental location has made its area one of the last to be reached by the successive marine invasions from the Cambrian on. A quantitative study of the length of post-Cambrian time during which Iowa has been land versus the length of time it has been more or less a sea floor is offered.
Glacial Outlook From Iowa, Charles Keyes
Glacial Outlook From Iowa, Charles Keyes
Proceedings of the Iowa Academy of Science
Iowa and the upper Mississippi basin are, as is now quite generally known, in possession of the most complete Glacial succession in the whole world. With its great wealth of recorded observation the trend of inquiry turns not so much to unearthing more tillsheets, as was the prognostication of the enthusiastic Calvin, as it is to ferret out the most plausible causes of periodic glaciations, and especially to test their astronomical relationships
A Spectorophotometric And Spectroscopic Study Of Phi Persei, Herbert F. Schiefer
A Spectorophotometric And Spectroscopic Study Of Phi Persei, Herbert F. Schiefer
Proceedings of the Iowa Academy of Science
The great importance of intensity studies in stellar spectra has long been recognized and as such has been the subject of many investigations. Most of the early studies have been on the intensity distribution of the continuous spectrum. The more recent investigations have been confined to special regions of the continuous spectrum as well as on selected spectral lines. Various methods have been used for such intensity studies.
The Fluorescence Of Cod Liver Oil, C. A. Morehouse
The Fluorescence Of Cod Liver Oil, C. A. Morehouse
Proceedings of the Iowa Academy of Science
The fluorescence was produced by the radiation from a Cooper Hewitt quartz mercury vapor lamp. A Corex "A" blue purple filter was used to filter out that part of the spectrum of the exciting light in which the fluorescence appeared. The filtered light, which was almost entirely ultraviolet, was focused directly onto the surface of the cod liver oil by means of a quartz lens.
Physical Properties Of Some Vegetables, Earl C. Mccracken
Physical Properties Of Some Vegetables, Earl C. Mccracken
Proceedings of the Iowa Academy of Science
Extensive investigations are being made by the Household Equipment department of the Home Economics division of Iowa State College on the possible economy of cooking foodstuffs by the direct application of an electric current. Consequently a more complete knowledge of the related physical properties of such materials is essential to the proper development of a satisfactory process. In this paper are given the results of measurements of the specific heats of some vegetables and of the internal temperatures and electrical resistances of potatoes under the action of different a.c. voltages.