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Articles 32011 - 32040 of 35956
Full-Text Articles in Entire DC Network
What We Don't Know About Emotions, Christian A. Ruckmick
What We Don't Know About Emotions, Christian A. Ruckmick
Proceedings of the Iowa Academy of Science
A summary of the work that has been done in the scientific study of the emotions, and a survey of the problems to be attacked and of the methods that may be used in their study.
Are We Giving The Child A Chance Musically?, Melvin S. Hattwick
Are We Giving The Child A Chance Musically?, Melvin S. Hattwick
Proceedings of the Iowa Academy of Science
As one aspect of a larger problem on the genesis of pitch behavior from birth through the fifth year, 37 four and five-year old children in preschool were given 28 practices on a song over a period of 14 days. These practices were given as group practices during the regular music period. At the end of the practice period each child recorded the song on a dictaphone record, first in the key of the practice period (the investigator gave the starting pitch), and then in a key 3 semi-tones lower.
Differential Reactions Of Newborn Infants To Different Degrees Of Light Intensity, Laberta A. Weiss
Differential Reactions Of Newborn Infants To Different Degrees Of Light Intensity, Laberta A. Weiss
Proceedings of the Iowa Academy of Science
As one aspect of a larger problem on the responsiveness of the newborn infant to the external environment, 90 infants, ranging in age from zero to ten days, have been studied under three intensities of light to determine (1) whether there are measurable differences in the amount of activity of the newborn under different light intensities, and (2) what the characteristics and implications of these differences are, provided they exist. The light intensities used may be described as minimal, dim and moderate. The exact strengths at the level of the infants' eyes were determined by means of an illuminometer. Each …
A Measure Of The Amount Of Cheating By College Students, E. O. Finkenbinder
A Measure Of The Amount Of Cheating By College Students, E. O. Finkenbinder
Proceedings of the Iowa Academy of Science
Can college students be expected to score their own or others papers without overlooking some of the errors or without changing some of the answers so as to cover up errors that have been made? Papers containing +, -True, False, Yes, No as answers were photographed without the students' knowledge then returned to the class the day after the test. A chart containing the correct answers was presented for them to use as a key for scoring their papers, - in some classes their own papers, yet in other classes, papers written by other students in the class. The percentage …
The Passenger Pigeon As A Former Iowa Bird, Philip A. Du Mont
The Passenger Pigeon As A Former Iowa Bird, Philip A. Du Mont
Proceedings of the Iowa Academy of Science
The Passenger Pigeon (Ectopistes migratorius) is believed to have been the most abundant species of bird in the world. It formerly ranged, as a breeding bird, over all of the wooded areas east of the Rocky Mountains and from southern Canada to Kansas, Kentucky, and Pennsylvania. During the winter months the great hordes wandered as far south as the Gulf States in search of food.
The Early Instars Of The Firebrat Thermobia Domestica (Packard), (Thysanura), J. Alfred Adams
The Early Instars Of The Firebrat Thermobia Domestica (Packard), (Thysanura), J. Alfred Adams
Proceedings of the Iowa Academy of Science
The firebrat, one of the minor household pests of Iowa, is an insect of more than usual scientific interest. Besides being remarkably thermophilic it represents the primitive order of the Apterygota, the Thysanura, the biology of which should have considerable bearing in the fields of insect physiology and phylogeny.
Notes On The Sporulation Time, Prepatent Period, Patent Period, And Size Of Oocycts In Infections With Isospora Lacazei Labbe, Phoebe R. Hall
Notes On The Sporulation Time, Prepatent Period, Patent Period, And Size Of Oocycts In Infections With Isospora Lacazei Labbe, Phoebe R. Hall
Proceedings of the Iowa Academy of Science
The present study was undertaken in order to check the report of Boughton (1930) that the oöcysts of Isaspora lacazci decrease in size progressively during the course of an infection. Incidentally, some information relative to the prepatent period and patent period in this infection was obtained.
An Inherited Eye Defect In The Guinea Pig, W. V. Lambert, E. W. Shrigley
An Inherited Eye Defect In The Guinea Pig, W. V. Lambert, E. W. Shrigley
Proceedings of the Iowa Academy of Science
The data presented in this paper were obtained from the descendants of one defective-eyed male guinea pig that appeared in our colony several years ago. Notation was made of the defective eye, but as the male was being used in another experiment no matings were made at that time to determine whether the condition was genetic. However, when the same type of defect was later observed in the inbred descendants of this male, some matings were made to determine, if possible, the manner of inheritance of the condition.
The Size Of The Oocyst In A Selected Strain Of Coccidia, Phoebe R. Hall, Elery R. Becker
The Size Of The Oocyst In A Selected Strain Of Coccidia, Phoebe R. Hall, Elery R. Becker
Proceedings of the Iowa Academy of Science
The writers noticed while studying Eimeria miyairii Ohira infections in the white rat that there was a rather wide variation in the size of the oöcysts when a highly heterozygous strain of the parasite was used for infective purposes.
The Effect Of Heavy Rains On The Orthoptera (Grasshopper) Population Of The Prairie, George O. Hendrickson
The Effect Of Heavy Rains On The Orthoptera (Grasshopper) Population Of The Prairie, George O. Hendrickson
Proceedings of the Iowa Academy of Science
The general interest created by destructive grasshoppers in the past few years incited the author to some studies on populations of Orthoptera, particularly on prairie patches in Iowa. Correlations of the data with climatic information will be made at times to yield possibly valuable results.
Title Page - Front Matter
Proceedings of the Iowa Academy of Science
No abstract provided.
In Memoriam: Frank Fayette Almy; Ervin E. Reed; William E. Albert; Frank W. Paige; Arthur Gray Leonard; Winfield Scott Dudgeon; Max E. Witte; Royal Edgar Jeffs; H. Gregg Smith, H. W. Norris, Charles Reuben Keyes, Katherine Mauthe, J. N. Martin, T. J. Maney, John A. Yarbrough, H. A. Mattill
In Memoriam: Frank Fayette Almy; Ervin E. Reed; William E. Albert; Frank W. Paige; Arthur Gray Leonard; Winfield Scott Dudgeon; Max E. Witte; Royal Edgar Jeffs; H. Gregg Smith, H. W. Norris, Charles Reuben Keyes, Katherine Mauthe, J. N. Martin, T. J. Maney, John A. Yarbrough, H. A. Mattill
Proceedings of the Iowa Academy of Science
No abstract provided.
Some Biological Contributions To Recreation (Address Of The President), H. E. Jaques
Some Biological Contributions To Recreation (Address Of The President), H. E. Jaques
Proceedings of the Iowa Academy of Science
To my memory comes the scene of a little group of college students nearing the end of a long morning tramp through the tall dew wet grass of early spring. We were out on a bird trip and had gone several miles through the woods. The physical condition of the little company would not be expected to inspire enthusiasm. As we reached the city park and found still more warblers breakfast gathering in the trees, one of the young women cried out with an exultation never to be forgotten, "Oh! I know I shall enjoy this all my life."
Potato Tubers As A Culture Medium For Phytopathogenic Bacteria And Fungi, W. H. Davis
Potato Tubers As A Culture Medium For Phytopathogenic Bacteria And Fungi, W. H. Davis
Proceedings of the Iowa Academy of Science
Tubers of the Irish potato were early recognized as a suitable medium for artificial culture of various organisms. Bacteriologists were first to use slices of tubers for culturing bacteria. Similarly, De Bary, the father of mycology, and Brefeld, the father of myceticulture, used both cooked and raw tubers as a substrate for culturing fungi. Later, Hallier observed that some fungi grew better on a medium containing both starch and sugar than on one containing starch alone. So, after his observations, the abundant starch content of the potato tuber was augmented by different sugars whenever occasion demanded it.
Oxygen Absorption And Carbon Dioxide Production In Soils, F. B. Smith, P. E. Brown
Oxygen Absorption And Carbon Dioxide Production In Soils, F. B. Smith, P. E. Brown
Proceedings of the Iowa Academy of Science
Carbon dioxide production in the soil has long been regarded as a measure of biological activity. It has been suggested that oxygen absorption might give a more reliable measure of the total action of microorganisms than carbon dioxide production. Since the amount of oxygen consumed by aerobic organisms under constant environmental conditions bears a definite relation to the amount of carbon dioxide produced, it would seem that the ratio of carbon dioxide produced to oxygen consumed would show something concerning the nature of the organic matter of the soil, its composition and rate of decomposition and, therefore, be a better …
The Effects Of Exfloration On The Soybean, Stanley Austin
The Effects Of Exfloration On The Soybean, Stanley Austin
Proceedings of the Iowa Academy of Science
Most of the literature on growth and reproduction in plants leaves the implication that cessation of vegetative activity in plants of an indeterminate type of growth is due to the drain of nutrient materials imposed on the plant by the developing fruits. This is not true for the soybean. The variety used in this investigation flowers early and continues to grow for some time afterward and appears to cease growing as the fruits mature. However, plants from which the flowers are continuously removed increase in percentage of dry weight at the same rate as the controls and stop growing at …
The Cytology Of Homothallism, J. E. Sass
The Cytology Of Homothallism, J. E. Sass
Proceedings of the Iowa Academy of Science
Coprinus sterquilinus, a homothallic Hymenomycete, has a typical diploid nuclear cycle i.e., nuclear fusion occurs in the basidium, followed by the formation of a nuclear tetrad and four spores. Each spore receives one nucleus which divides at least once. The chromosomes are too small and poorly defined to use the chromosome count to establish the time and place of meiosis, but the fact that each spore, though receiving but one nucleus, carries the full complement of sex factors, suggests that disjunction of sex factors does not occur in the basidium. Disjunction, and possibly numerical reduction may be delayed until nuclear …
The Leaf As A Propagative Organ, John A. Yarbrough
The Leaf As A Propagative Organ, John A. Yarbrough
Proceedings of the Iowa Academy of Science
That the leaves of a number of plants may be utilized as a means of propagation is appreciated in both the practical and theoretical field. The precise manner of such vegetative propagation has been investigated by the author in two cases, Bryophyllum and Tolmiea. These are representatives of a type which is to be contrasted with the Begonia type. A restatement of the morphological principles involved in well known cases of propagation by leaves has been attempted.
Vernation In Some Iowa Woody Plants, H. D. Harrington
Vernation In Some Iowa Woody Plants, H. D. Harrington
Proceedings of the Iowa Academy of Science
A list of three or four hundred woody plants of Iowa with the vernation of each. A general discussion of vernation and presentation of a foot-focusing device for the binocular microscope used in this investigation.
The Development Of New Lateral Roots In The Crown Buds In Melilotus Alba, J. N. Martin
The Development Of New Lateral Roots In The Crown Buds In Melilotus Alba, J. N. Martin
Proceedings of the Iowa Academy of Science
In transplanting the biennial sweet clovers from the field to the greenhouse during the dormant period it was observed that the removal of the crown buds interfered with the development of new secondary roots. In the absence of the crown buds fewer new secondary roots were formed and those formed were especially characterized by the absence of branching. The same results were obtained when light was excluded from the crown buds. This fact indicates a relationship between the formation of new secondary roots and the chlorophyll activity in the crown buds. By grafting crown buds on decrowned roots which were …
Additions To The Flora Of Linn County, E. J. Petry
Additions To The Flora Of Linn County, E. J. Petry
Proceedings of the Iowa Academy of Science
A list of unreported species for Linn County, Iowa, together with remarks upon emendations.
Observations On The Staining Of Bacterial Flagella, E. J. Petry
Observations On The Staining Of Bacterial Flagella, E. J. Petry
Proceedings of the Iowa Academy of Science
Influence of the pH of the medium, on the staining of flagella, as shown by several of the more highly recommended methods.
Some Notes On The Voges-Proskauer Reaction, S. S. Epstein, Max Levine
Some Notes On The Voges-Proskauer Reaction, S. S. Epstein, Max Levine
Proceedings of the Iowa Academy of Science
The formation of acetyl-methyl-carbinol by members of the genus Aerobacter was detected in six-hour cultures. The procedure involved the heavy inoculation of young agar slant cultures into approximately three cc. Difeo M.R.-V.P. medium, incubation at 30° C. for six hours and using 0.3 per cent creatine in 40 per cent KOH as the test reagent. Seventy per cent of 202 cultures tested produced positive results within one hour after the addition of the test reagent and over ninety-nine per cent within four hours. The creatine KOH solution was satisfactorily effective for three weeks when kept at ordinary laboratory conditions and …
The Germicidal Action Of Α-Alkylated Furoic Acid, N. O. Calloway, H. Gilman, C. H. Werkman
The Germicidal Action Of Α-Alkylated Furoic Acid, N. O. Calloway, H. Gilman, C. H. Werkman
Proceedings of the Iowa Academy of Science
A series of alkylated furoic acids has recently been synthesized by means of the Friedel-Crafts reaction. In a study on the germicidal action of these compounds it has been found that some of them are of relatively high germicidal efficiency. This study was carried out on a virulent strain of Staphylococcus aureus using a modified Anderson-McClintic technic.
Sugar Dissimilation By Shigella Paradysenteriae Variety Sonne, Howard Reynolds, C. S. Mccleskey, C. H. Werkman
Sugar Dissimilation By Shigella Paradysenteriae Variety Sonne, Howard Reynolds, C. S. Mccleskey, C. H. Werkman
Proceedings of the Iowa Academy of Science
Colonies of Shigella paradysenteriae var. Sonne are characterized on lactose and sucrose agar media by the formation of papillae after several days' incubation at 37° C. Organisms in the papillae dissimilate lactose or sucrose with the formation of acid within 24 hours, whereas the remaining organisms in the colony fail to show acid production on china blue-rosolic acid differential medium. The acid papillae appear blue on a pink colony. In a liquid medium containing sucrose or lactose, alkaline organisms reach a maximum after two to six days followed by a decline of alkaline organisms with a marked increase of acid …
The Libriform Fibers In The Roots And Crown Of Medicago And Melilotus, J. N. Martin, Austin O. Simonds
The Libriform Fibers In The Roots And Crown Of Medicago And Melilotus, J. N. Martin, Austin O. Simonds
Proceedings of the Iowa Academy of Science
The libriform fibers, long known to be especially prominent in many of the Leguminsoae, particularly the papilionaceae, constitute a large part of the xylem and are present in the phloem of the roots and crowns of the alfalfas and sweet clovers. They deserve mentioning in these legumes because the modifications they undergo at different periods in the plant's growth cycle indicate that they function as storage structures, and have an importance relative to the nutrition of the plant.
Contraction Of The Roots And Crowns Medicago And Melilotus, Austin O. Simonds, J. N. Martin
Contraction Of The Roots And Crowns Medicago And Melilotus, Austin O. Simonds, J. N. Martin
Proceedings of the Iowa Academy of Science
The longitudinal contraction, a natural phenomenon of many plants, which results in lowering the basal portion of the plant deeper in the soil, is apparently accomplished in various ways. In both alfalfa and sweet clover the crowns are pulled vertically downward two to four inches during the first season. This is accomplished chiefly by the contraction vertically and the expansion radially and tangentially of parenchymatous cells that are continuously being formed in isolated groups scattered among the vascular elements. The development and expansion of these intercalated masses of parenchyma separate the vascular elements into tortuous strands, the tortuosity of which …
The Effect Of Lime And Phosphate On Nitrification In An Acid Soil, Harold L. Dean, F. B. Smith
The Effect Of Lime And Phosphate On Nitrification In An Acid Soil, Harold L. Dean, F. B. Smith
Proceedings of the Iowa Academy of Science
The nitrate content in all soils is maintained through the action of microorganisms upon ammonia. This process of nitrate production is called nitrification. It is interesting to note the effect that lime and rock phosphate has upon the nitrate producing power in an acid soil.
Pollen Studies Of Some Leguminosae, J. N. Martin
Pollen Studies Of Some Leguminosae, J. N. Martin
Proceedings of the Iowa Academy of Science
The pollen of thirty species distributed among twenty-five genera of the Leguminosae are covered in this study. The size, shape, and the number of germ pores of the pollen grains and the substances within their protoplasm are recorded.