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Growth On Histidine And Lysine Injected Subcutaneously Or Intraperitoneally, Ralph M. Conrad, Clarence P. Berg
Growth On Histidine And Lysine Injected Subcutaneously Or Intraperitoneally, Ralph M. Conrad, Clarence P. Berg
Proceedings of the Iowa Academy of Science
Recently a controversy has arisen in the literature as to whether or not tryptophane can be utilized for growth when administered subcutaneously. The evidence, is divided, but favors the affirmative somewhat. The fundamental question involved embraces also other amino acids, especially the essential ones. We have therefore tested the growth-promoting abilities of histidine and lysine when subcutaneously or intraperitoneally administered to rats fed diets deficient in histidine or lysine respectively, but otherwise adequate. In every case growth resulted.
Intonation In Violin Performance, Paul C. Greene
Intonation In Violin Performance, Paul C. Greene
Proceedings of the Iowa Academy of Science
A controversy exists as to whether artists who play stringed instruments perform in the so-called "natural" (sometimes called the "just" or "pure") musical scale, in the "equally tempered" scale, or in some other scale. A related question is whether these artists characteristically enlarge (augment) or contract (diminish) certain intervals as compared with their theoretical scale values.
Officers, Committees, Past Presidents, And Members, Iowa Academy Of Science
Officers, Committees, Past Presidents, And Members, Iowa Academy Of Science
Proceedings of the Iowa Academy of Science
No abstract provided.
In Memoriam: Charles Sherman Cobb; Elbert William Rockwood; Franklin Scott Wilkins; Alonzo A. Miller; James H. Lees, T. C. Stephens, J. N. Pearce, H. D. Hughes, W. A. Hauber, E. J. Cable
In Memoriam: Charles Sherman Cobb; Elbert William Rockwood; Franklin Scott Wilkins; Alonzo A. Miller; James H. Lees, T. C. Stephens, J. N. Pearce, H. D. Hughes, W. A. Hauber, E. J. Cable
Proceedings of the Iowa Academy of Science
No abstract provided.
Progress In The Regeneration Of The Prairie At The Iowa Lakeside Laboratory, W. A. Anderson
Progress In The Regeneration Of The Prairie At The Iowa Lakeside Laboratory, W. A. Anderson
Proceedings of the Iowa Academy of Science
The prairie tract owned by the Iowa Lakeside Laboratory lies northwest of Miller's Bay, West Okoboji Lake, in Section 23, T. 99 N., R. XXXVII W., Dickson County, Iowa. It covers approximately sixty acres of irregular surface, which drains toward the southeast into the bay. There are several more or less prominent morainic knobs in the tract. Three springy places support hanging bogs, each with its little stream draining into the lake; another tiny bog has no outlet. A shallow pond on the extreme western edge of the tract has been drained by highway ditches and is practically extinct. The …
The Life Cycle Of Cryptococcus Hominis, Ramona L. Todd
The Life Cycle Of Cryptococcus Hominis, Ramona L. Todd
Proceedings of the Iowa Academy of Science
Two groups of fungi which include organisms pathogenic for humans have received some attention from medical men in recent years. These groups, the true yeasts and the false yeasts, have been studied only superficially from a standpoint of morphology and taxonomic relationships; hence, the classification and nomenclature, particularly of the false yeasts, has been in a state of confusion. The true yeasts, those which produce ascospores and form no mycelium, are placed in the family Saccharomycetaceae, order Endomycetales, class Ascomycetes. The yeast-like organisms for which no perfect stage has been demonstrated are grouped in one form family (given various names …
The Radiometer: A Simple Instrument For The Measurement Of Radiant Energy In Field Studies, J. M. Aikman
The Radiometer: A Simple Instrument For The Measurement Of Radiant Energy In Field Studies, J. M. Aikman
Proceedings of the Iowa Academy of Science
During the past decade important advances have been made in the measurement of light and radiant energy. Although previous to this time emphasis was placed on the refinement of instruments for measuring light, during this period emphasis has been placed on the measurement of radiant energy since plants are affected by rays both longer and shorter than those of the visible spectrum.
A Fusarium Following Frost-Injury Of Robinia, J. C. Gilman, B. B. Sproat
A Fusarium Following Frost-Injury Of Robinia, J. C. Gilman, B. B. Sproat
Proceedings of the Iowa Academy of Science
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 …
The Biota Of The Cedar River As Related To Odor And Taste Production, E. J. Petry
The Biota Of The Cedar River As Related To Odor And Taste Production, E. J. Petry
Proceedings of the Iowa Academy of Science
This paper presents a brief summary of surveys carried through the past two years, as an aid in the control of odor and taste in city water. So far as the writer is aware, no work of this kind has previously been done at Cedar Rapids, hence comparisons can only be drawn between the years covered, or amongst the months represented.
Records Of A Dodder Gall-Weevil In Iowa, Henry Lee Dean
Records Of A Dodder Gall-Weevil In Iowa, Henry Lee Dean
Proceedings of the Iowa Academy of Science
Beguinot (1) early described the morphology and anatomy of galls induced on Cuscuta by species of Smicronyx, the genus containing the dodder gall-weevils. Yuncker (4) referred to swellings on stems and flower pedicels of dried herbarium material of Cuscuta and suggested that these galls were caused by an insect, then unidentified because of the condition of the specimens. Weiss and West (3) described galls from Monmouth Junction, New Jersey, on Cuscuta cephalanthi Englm. caused by the dodder gall-weevil, Smicronyx sculpticollis Casey. Gertz (2) reported galls from Sweden on the stems and flower pedicels of Cuscuta europaea L. caused by another …
The Microfossil Succession In A Bog In Northern Wisconsin, Eleanor Glloway
The Microfossil Succession In A Bog In Northern Wisconsin, Eleanor Glloway
Proceedings of the Iowa Academy of Science
A stratigraphical and statistical study was made of the microfossils in the marginal mat of a bog lake located near the Limnological Laboratories of the Wisconsin Geological and Natural History Survey at Trout Lake, Wisconsin. The fossils indicate that the regional flora was dominated, early in its history by a gymnosperm element, but was gradually replaced by angiosperms. The use of microfossils in determining the vertical distribution of limnic sediments in bog deposits was found to be an accurate method. The fossils used in this connection were sponge spicules and internal leaf trichomes of water lilies.
Introduction Of Aquatic Plants Into The Artificial Lakes Of Iowa, W. W. Aitken
Introduction Of Aquatic Plants Into The Artificial Lakes Of Iowa, W. W. Aitken
Proceedings of the Iowa Academy of Science
From a study of the reservoirs in southern Iowa, created by damming streams, it is apparent that aquatic vegetation should be introduced into the new artificial lakes to accelerate natural succession. As the areas are created for fishing lakes, a demand is made by the public to open them to fishing as soon as the fish have reached a takable population.
Specificity Of Three Wood-Destroying Fungi For Gymnosperm And Angiosperm Woods, H. H. Lafuze
Specificity Of Three Wood-Destroying Fungi For Gymnosperm And Angiosperm Woods, H. H. Lafuze
Proceedings of the Iowa Academy of Science
Certain differences in nutritional characteristics of Polyporus betulinus Fr., Polystictus versicolor Fr. and Fomes pinicola (Fr.) Cooke appeared to be correlated with differences in chemical analyses of Gymnosperm and Angiosperm woods. Worthy of special mention were the water soluble extractives containing simpler carbohydrates and the pentoses in coniferous woods, the commonest hosts of F. pinicola. This organism and also the birch fungus, P. betulinus, showed high reductase activity, a phenomenon reported common in brown rot fungi on Gymnosperm, birch and alder woods. In contrast, P. versicolor, which attacks a wide variety of angiosperm woods in nature, displayed a high oxidase …
The Postglacial History Of The Forest Of Northwestern Wisconsin, L. R. Wilson
The Postglacial History Of The Forest Of Northwestern Wisconsin, L. R. Wilson
Proceedings of the Iowa Academy of Science
The microfossil succession in ten bog deposits of northwestern Wisconsin was determined in an effort to trace the post Pleistocene floral history in that region. The deposits were selected with reference to the shorelines of Glacial Lakes Duluth, Algonquin, and Nipissing in order that stratigraphic comparison of the fossils might be accomplished. These comparative studies indicate that upon each area of land that was progressively uncovered by the waters of the glacial lakes there developed a pioneer forest of Picca and the subsequent development upon these areas appears to have been in response to the soils. The general forest succession …
Rare And Unusual Plants From South Eastern Iowa, Charles Gilly, Malcolm Mcdonald
Rare And Unusual Plants From South Eastern Iowa, Charles Gilly, Malcolm Mcdonald
Proceedings of the Iowa Academy of Science
In 1922 Professor Charles Carter, of Parsons College, and the late Dr. L. H. Pammel, of Ames, began a botanical survey of south-eastern Iowa. During the years following, collections were made and the specimens sent to the herbarium of Iowa State College, where the headquarters of the survey had been established. After Dr. Parnmel's death in 1931 the project was abandoned; but in April, 1933 Professor Carter revived it and the authors began the collection of specimens for a Parsons College Herbarium. In the past three years they have collected and identified about 800 species of plants. The greatest portion …
Studies On Sporobolomyces And Bullera, H. C. Olson
Studies On Sporobolomyces And Bullera, H. C. Olson
Proceedings of the Iowa Academy of Science
Thirty-two cultures of spore-discharging false yeasts were isolated from the air and from other sources examined. Detailed studies identified twenty-six of the cultures as members of the genus Sporobolomyces and the remaining six as members of the genus Bullera. Twelve of the cultures of Sporobolomyces were classified as S. salmonicolor, eleven as S. roseus and the remaining three cultures apparently constitute a new species. The six cultures of Bullera were all identified as B. alba. Considerable variation was noted among the cultures of each species of Sporobolomyces and Bullera but, since marked variations in a culture could be induced by …
A Factor In The Distribution Of Minor Veins In Dicotyledon Leaves, Robert B. Wylie
A Factor In The Distribution Of Minor Veins In Dicotyledon Leaves, Robert B. Wylie
Proceedings of the Iowa Academy of Science
Critical survey of a wide series of foliage leaves shows a fairly close relation between mesopyll organization and intervascular distance. Among Dicotyledons there is a close correlation between relative amount of leaf tissue that is horizontally arranged in the blade in comparison with that having cells elongated at right angles to the epidermis.
Pathological Polyploidy In Seedlings Of Corn And Sorghum, J. E. Sass
Pathological Polyploidy In Seedlings Of Corn And Sorghum, J. E. Sass
Proceedings of the Iowa Academy of Science
The writer had demonstrated that Coprinus sterquilinus contains an extra-nuclear mechanism which bears structural homologies with the Golgi apparatus in animal spermatocytes. Numerous other Hymenomycetes have been examined. Coprinus atramentarius contains a distinct Nebenkern sphere, consisting of a large hyaline sphere, in which there are peripheral, chromophilic granules. This body is most distinct just before the meiotic division of the fusion nucleus occurs. It is probable that the sterigmatic bodies described by various workers, are derived from this Golgi apparatus, rather than from the centrosomes.
A Method For Determining The Exchange Capacity Of Organic Matter In The Presence Of Nitrogen And Calcium, H. C. Millar, F. B. Smith, P. E. Brown
A Method For Determining The Exchange Capacity Of Organic Matter In The Presence Of Nitrogen And Calcium, H. C. Millar, F. B. Smith, P. E. Brown
Proceedings of the Iowa Academy of Science
Many methods have been used for determining the base exchange capacity of soils and certain advantages have been claimed by each investigator for his particular method. Fewer studies on the base exchange reactions of organic matter have been made and the nature of the material makes many of the methods used for soils impracticable and inaccurate when applied to organic matter. According to McGeorge (1) the monovalent lignin salts are soluble in alcohol and the use of alcohol in base exchange studies on organic matter is of questionable value. The removal of excess soluble salt from the base exchange …
Electrokinetic Potentials At Liquid Surfaces, W. G. Eversole, F. S. Thomas
Electrokinetic Potentials At Liquid Surfaces, W. G. Eversole, F. S. Thomas
Proceedings of the Iowa Academy of Science
Aqueous solutions of potassium chloride were allowed to flow through air. The solutions were from 10-1 N. to 10-7 N. The hydrostatic pressure was from 17 to 22 cm. of solution. The flow was vertical and laminar, through a circular aperture in a thin platinum disc on to a second platinum disc. The diameter of the aperture was 0.05 cm. The discs served as electrodes. The potential difference was measured with a vacuum tube potentiometer. The floating grid method was used, so the potential difference was measured with essentially no current flow. The values obtained were similar to …
Chemistry In The Iowa Academy Of Science, L. Chas. Raiford
Chemistry In The Iowa Academy Of Science, L. Chas. Raiford
Proceedings of the Iowa Academy of Science
As indicated in Table I, a preliminary meeting looking toward the organization of an academy of science in Iowa was held in Iowa City in 1875. According to the records three professors and four doctors were present at the meeting. Two of the professors were from Ames and one from Iowa City, while Ames, Iowa City, Davenport and Des Moines were represented by the four medical men. Five other persons, two of whom were in academic work and three in medical practice, stationed at Iowa City, Tabor, Clinton, Davenport and Dubuque, respectively, had previously expressed their approval of the proposed …
Studies On The Removal Of Fluorine From Drinking Waters In The State Of Iowa, C. A. Kempf, W. E. Galligan, D. A. Greenwood, V. E. Nelson
Studies On The Removal Of Fluorine From Drinking Waters In The State Of Iowa, C. A. Kempf, W. E. Galligan, D. A. Greenwood, V. E. Nelson
Proceedings of the Iowa Academy of Science
Our knowledge concerning the distribution of fluorine in drinking waters and the effect of such waters on the structure of the teeth has been appreciably expanded by the recent researches of Smith, Lantz, and Smith (1), Churchill (2), McKay (3), Kehr (4), Ostrem, Nelson, Greenwood, and Wilhelm (5), Boissevain (6), Dean (7), Sebrell, Dean, Elvove, and Breaux (8) and Boruff and Abbott (9). Smith, Lantz, and Smith (1), of the University of Arizona, were the first to show that mottled enamel is clue to fluorides in the drinking water; in fact, their analyses of waters from endemic areas show that …
Growth Promoting Ability Of D- And L-Lysine, Clarence P. Berg
Growth Promoting Ability Of D- And L-Lysine, Clarence P. Berg
Proceedings of the Iowa Academy of Science
We have previously reported work on the influence of optical isomerism on the utilization of essential amino acids for growth. As an extension of this program we have devised a method for the resolution of di-lysine and have fed the d and the l modifications to rats as supplements to diets deficient in lysine, but otherwise complete. The unnatural l-lysine proved to be unable to stimulate growth. In this respect it is like the unnatural modification (d) of cystine, but differs from the unnatural isomers of tryptophane (d) and histidine (d).
The Effects Of Fluorides On The Teeth, C. A. Kempf, V. E. Nelson
The Effects Of Fluorides On The Teeth, C. A. Kempf, V. E. Nelson
Proceedings of the Iowa Academy of Science
Mention was made, in the previous paper, of the fact that mottled enamel of the teeth results from the presence of fluorine in the water supply. The water of the city of Ankeny and surrounding territory may have a fluorine concentration to exceed eight or ten parts per million of water; mottled enamel is very prevalent in that area. Work by Smith (1) of the University of Arizona indicates that mottled enamel may result when the concentration of fluorine is as low as 0.8 to 0.9 part per million of water. The work of Schulz and Lamb (2) and McCollum, …
The Influence Of L- And Dl-Tryptophane And Kynurenic Acid Administration On Bile Volume And Composition, John T. Correll, Clarence P. Berg, Donald W. Cowan
The Influence Of L- And Dl-Tryptophane And Kynurenic Acid Administration On Bile Volume And Composition, John T. Correll, Clarence P. Berg, Donald W. Cowan
Proceedings of the Iowa Academy of Science
We have undertaken to determine whether kynurenic acid production or excretion in the bile (as reported by Kotake and Ichihara) might be responsible, at least in part, for the choleretic effect of tryptophane. We have also studied the influence of optical configuration of tryptophane on bile volume and on bile salt output, both of which Whipple and Smith found were increased by l-tryptophane administration.
Basic Strength Of Ketimines By The Use Of The Glass Electrode, J. B. Culbertson, Dewalt Young
Basic Strength Of Ketimines By The Use Of The Glass Electrode, J. B. Culbertson, Dewalt Young
Proceedings of the Iowa Academy of Science
The relative strengths of the ketimines as organic nitrogen bases has been considered one of the prime factors affecting the stability of the ketimine salts toward hydrolysis to ketones. A measurement of the hydrogen (hydronium) ion concentration of ketimine salts (hydrochlorides) furnishes the information necessary for the calculation of these basic strengths.
Antioxidants And The Autoxidation Of Fats V. Mode Of Action Of Anti- And Pro-Oxidants, L. A. Hamilton, H. S. Olcott
Antioxidants And The Autoxidation Of Fats V. Mode Of Action Of Anti- And Pro-Oxidants, L. A. Hamilton, H. S. Olcott
Proceedings of the Iowa Academy of Science
Experiments on the oxidation of purified methyl oleate support the view that its induction period, and probably that of natural oils, is due to the presence of inhibitors and that purified unsaturated compounds have no induction period, other than the time required for gaseous oxygen to diffuse into the liquid.
The Friedel-Crafts Reaction With Furans, M. Mccorkle, J. A. V. Turck Jr.
The Friedel-Crafts Reaction With Furans, M. Mccorkle, J. A. V. Turck Jr.
Proceedings of the Iowa Academy of Science
2-Furoic acid, aluminum chloride and substituted benzenes give 6-substituted-l-naphthoic acids. For example, with chlorobenzene the product is 6-chloro-1-naphthoic acid; with anisole, 6-methoxy-1-naphthoic acid; with toluene, 6-methyl-1-naphthoic acid.
Mixed Diacyl Derivatives Of O-Aminophenol Containing An Acyl Derived From A Sulfonic Acid, L. Chas. Raiford, J. Reid Shelton
Mixed Diacyl Derivatives Of O-Aminophenol Containing An Acyl Derived From A Sulfonic Acid, L. Chas. Raiford, J. Reid Shelton
Proceedings of the Iowa Academy of Science
In previous work in this Laboratory it was found that, in general, only one mixed diacyl derivative can be obtained from o-aminophenol, regardless of the order of introduction of these acyls, provided both are derived from carboxylic acids. In one case a migration of acyl from nitrogen to oxygen must have occurred. When one of these acyls is derived from a sulfonic acid no rearrangement is observed.
Iodine Substitution Products Of Vanillin, L. Chas. Raiford, Eugene H. Wells
Iodine Substitution Products Of Vanillin, L. Chas. Raiford, Eugene H. Wells
Proceedings of the Iowa Academy of Science
In 1872 Carles prepared a mono- and a diiodovanillin, but did not characterize them. In the current edition of Beilstein they are recorded as of unknown structures. Carles' work has now been repeated, and the structures of his products have been shown to be 5-iodovanillin and 2, 5-diiodovanillin, respectively. The behavior of these and similar derivatives toward typical amino compounds has been studied. No pronounced steric hindrance was noted in the latter reactions. The relation between the numerical values of the melting points and the positions of the halogen atoms in the iodine derivatives, so far as they have been …