Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

University of Northern Iowa

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 34411 - 34440 of 35955

Full-Text Articles in Entire DC Network

Amino Acid And Micro-Organisms, Arthur W. Dox Jan 1917

Amino Acid And Micro-Organisms, Arthur W. Dox

Proceedings of the Iowa Academy of Science

The study of amino acids has come to be recognized during recent years as a subject of tremendous importance, on account of its fundamental relation to the problems of human and animal nutrition. Not many years since, all proteins were thought to be of equal nutritive value. Now we know that many of the proteins are deficient in one or more amino acids, and cannot support life and growth unless supplemented by other proteins which make up the deficiency. And from a study of the proteins with reference to their amino acid make-up, the study of the amino acids …

Go to article

Officers, Past Presidents, And Members, Iowa Academy Of Science Jan 1917

Officers, Past Presidents, And Members, Iowa Academy Of Science

Proceedings of the Iowa Academy of Science

No abstract provided.

Go to article

Bird Records During The Past Winter, 1916-1917, In Northwestern Iowa, T. C. Stephens Jan 1917

Bird Records During The Past Winter, 1916-1917, In Northwestern Iowa, T. C. Stephens

Proceedings of the Iowa Academy of Science

The winter of 1916-1917 has shown a number of uncommon things concerning the avifauna of the region under consideration, of which Sioux City is the central station. The notes will be presented in the form of an annotated list of the birds found, but account will not be taken of a number of late migrating species which were seen within the limits of time hereinafter adopted, such, for example, as the Pipit, and others. Winter visitors and summer stragglers only will be listed.

Go to article

Notes Of Melilotus Alba, White Sweet Clover, Walter E. Rogers Jan 1917

Notes Of Melilotus Alba, White Sweet Clover, Walter E. Rogers

Proceedings of the Iowa Academy of Science

During recent years the legumes have not only become of first importance as hay and forage crops but they have been found to be of even more importance as restorers of soil fertility. The amount of interest and attention given to the group by working botanist has been large and ever increasing. It would seem that we ought to know as much as possible about our economic plants. It is with this in mind that the present paper is submitted. Melilotus alba (Desr.), once a despised roadside weed is now recognized as a valuable crop plant and is grown over …

Go to article

Proceedings Of The Thirty-First Annual Session (Of The Iowa Academy Of Science), Held In Grinnell, April 27 And 28, 1917: Minutes Of The Meeting; Staff & Committee Reports Jan 1917

Proceedings Of The Thirty-First Annual Session (Of The Iowa Academy Of Science), Held In Grinnell, April 27 And 28, 1917: Minutes Of The Meeting; Staff & Committee Reports

Proceedings of the Iowa Academy of Science

No abstract provided.

Go to article

An Annotated List Of The Mammals Of Sac County, Iowa, J. A. Spurrell Jan 1917

An Annotated List Of The Mammals Of Sac County, Iowa, J. A. Spurrell

Proceedings of the Iowa Academy of Science

My purpose in writing this list is to place on record data gathered principally from the pioneers of Sac County about the conditions in pioneer days and since. While these data are not as accurate as though they were confirmed by specimens, they are better than no information at all. I have used extreme care in differentiating species and have included some observations of my own made in the more recent years. I have also included some data on adjoining counties.

Go to article

An Analysis Of The Cranial Ganglia Of Squalus Acanthias, Sally P. Hughes Jan 1917

An Analysis Of The Cranial Ganglia Of Squalus Acanthias, Sally P. Hughes

Proceedings of the Iowa Academy of Science

This analysis confirms to a large degree the observations of Strong (1903) and Landacre (19l6). In Squalus acanthias the fifth, seventh and eighth nerves arise close together from the wall of the medulla and form a complex of roots, ganglia and fiber tracts. Taking them up in order, the gasserian or fifth nerve ganglion is seen to be a large hourglass-shaped mass extending out ventro-laterally from the brain wall: the distal part gives rise to the maxillaris V and the proximal part to the superficial opthalmic V and the mandibular V.

Go to article

A Picea From The Glacial Drift, Wilbur A. Thomas Jan 1917

A Picea From The Glacial Drift, Wilbur A. Thomas

Proceedings of the Iowa Academy of Science

Early this year (1917) we received at our laboratory a piece of fossil wood from Mr. B. O. Wolden of Wallingford, Iowa. Wallingford is in the northern part of the state, about thirty miles southeast of Spirit Lake. Mr. Wolden secured this wood from a farmer near Wallingford. It was taken up with an eighteen inch auger drilling machine from a depth of eighty feet. Along with this wood, were found some well-preserved bits of moss, some leaves or needles which resembled spruce needles, and a very small, immature cone.

Go to article

A Large Colony Of Fossil Coral, A. O. Thomas Jan 1917

A Large Colony Of Fossil Coral, A. O. Thomas

Proceedings of the Iowa Academy of Science

The abundant coralline remains preserved in the Niagaran beds in sections five, six, and seven, Scotch Grove township, Jones County, have been strikingly pointed out by Calvin in his Geology of Jones County. In this locality the corals formed a magnificent reef and with few exceptions they are now preserved completely silicified and are imbedded in a soft dolomitic matrix which upon weathering leaves the corals among the residual products. The few corals that have not been replaced by silica occur in the form of highly crystalline limestone which upon being sectioned and polished shows the internal character of the …

Go to article

The Influence Of Intensity Ratio On Binaural Sound Localization, E. M. Berry, C. C. Bunch Jan 1917

The Influence Of Intensity Ratio On Binaural Sound Localization, E. M. Berry, C. C. Bunch

Proceedings of the Iowa Academy of Science

It has been recognized that the intensity ratio at the ears is a factor in the localization of sound, but it appears that its influence has been greatly over-estimated. In the summer of 1916 G. W. Stewart and O. Hovda did considerable qualitative work on this. Our present research is a continuation of their work with practically the same apparatus.

Go to article

The Action Of The Amino Group On Amylolitic Enzymes, Elbert W. Rockwood Jan 1917

The Action Of The Amino Group On Amylolitic Enzymes, Elbert W. Rockwood

Proceedings of the Iowa Academy of Science

The work is a continuation of that reported last year on the action of the auxoamylases, the accelerators of starch splitting enzymes. Anthranilic acid (orthoaminobenzoic acid) has been shown to increase the activity of the salivary starch-digesting enzyme. In a similar manner the isomers of the authranilic acid were tested, the figures given below representing the relative amounts of digestive products formed.

Go to article

Title Page Jan 1917

Title Page

Proceedings of the Iowa Academy of Science

No abstract provided.

Go to article

Notes On A Decapod Crustacean From The Kinderhook Shale At Burlington, Otto Walter Jan 1917

Notes On A Decapod Crustacean From The Kinderhook Shale At Burlington, Otto Walter

Proceedings of the Iowa Academy of Science

The specimen which is the subject of this paper is the same as the one noted by Professor Stuart Weller in his article on ''The Succession of Fossil Faunas in the Kinderhook Beds at Burlington, Iowa.” The specimen was collected in an argillaceous shale,-bed number 1 of the paper cited,-and was among the material illustrating the fauna of that bed submitted to Doctor Weller by Professor Calvin and Professor Udden. In Weller's paper, page 69, the specimen is referred with some doubt to Palaeopalaemon newberryi Whitfield, with a note that it "is probably the same crustacean that Whitfield identified from …

Go to article

Some Geologic Aspects Of Conservation, James H. Lees Jan 1917

Some Geologic Aspects Of Conservation, James H. Lees

Proceedings of the Iowa Academy of Science

Iowa is usually considered as primarily a prairie state, one whose chief aesthetic attraction lies in the satisfaction that accompanies the outlook over wide spreading grain field or level plain stretching away beyond the farthest ken. In a general way this is true and it is the fundamental factor in Iowa's agricultural supremacy. But it is equally true that within the limits of the state there are many spots and localities which for unique interest or quiet beauty or stately grandeur can scarcely be excelled within the Mississippi Valley. Since these are essentially geologic phenomena it is my purpose to …

Go to article

On A Supposed Fruit Or Nut From The Tertiary Of Alaska, A. O. Thomas Jan 1917

On A Supposed Fruit Or Nut From The Tertiary Of Alaska, A. O. Thomas

Proceedings of the Iowa Academy of Science

In the summer of 1910, Dr. George F. Kay, while engaged in a study of the Bering River Coal Field of southeastern Alaska, discovered some subspherical, concretion-like bodies in the ''shales of the Tokun formation.'' Three specimens were brought back by Professor Kay and these through his kindness have been submitted to the writer for study. The largest is a smooth oval body with long and short diameters of 8.6 and 7.6 centimeters; the smallest is likewise smooth, irregularly oval, and with diameters of 4.3 and 3.8 centimeters. All three are dark-colored, compact, close-grained stone, brittle under the hammer, and …

Go to article

The Effect Of Hydrogen-Sulphide On The Unilateral Conductivity Of Zincite-Copper Contacts, R. B. Dodson Jan 1917

The Effect Of Hydrogen-Sulphide On The Unilateral Conductivity Of Zincite-Copper Contacts, R. B. Dodson

Proceedings of the Iowa Academy of Science

Of the many experiments concerned with the unilateral conductivity of the so-called crystal rectifiers very few have had to do with the effect of gases. The experiments described in this paper show that an artificial rectifier can be produced through the action of hydrogen-sulphide upon zincite-copper contacts. Such contacts show little or no unilateral conductivity in vacuo but possess the property to a considerable degree in an atmosphere of hydrogen-sulphide.

Go to article

The Eyeball And Associated Structures In The Blindworms, H. W. Norris Jan 1917

The Eyeball And Associated Structures In The Blindworms, H. W. Norris

Proceedings of the Iowa Academy of Science

Incidental to a more extended investigation of coecilian anatomy the following observations were made upon the ocular muscles and nerves.

Go to article

Odonata Of Iowa, Lloyd Wells. Jan 1917

Odonata Of Iowa, Lloyd Wells.

Proceedings of the Iowa Academy of Science

Iowa Odonata have not been given their due consideration in entomological records of the state. The few articles that have been written dealing with these insects as they occur within the state have been very local in nature. It is the purpose of this paper to list those species that have been recorded in the past and to give new records that have been obtained during the writer's recent collecting trips.

Go to article

The Use Of Iron In Nutrient Solutions For Plants, G. E. Corson, A. L. Bakke Jan 1917

The Use Of Iron In Nutrient Solutions For Plants, G. E. Corson, A. L. Bakke

Proceedings of the Iowa Academy of Science

Nutrient solutions have been made use of to a considerable extent in endeavoring to determine the specific role of certain nutrients as well as questions of nutrition in general. It is known that iron, although used in small quantities, is essential for chlorophyll production. The present work is a study for the purpose of ascertaining the value of different amounts of iron to an otherwise balanced solution. This feature has suggested itself in that the majority of such solutions do not contain definite amounts of iron, but are simply designated by a “trace.”

Go to article

Some Natural Waters Of Central New York, Nicholas Knight, Vernon C. Shippee Jan 1917

Some Natural Waters Of Central New York, Nicholas Knight, Vernon C. Shippee

Proceedings of the Iowa Academy of Science

The little stream from which the City of Oneida, New York, receives its water supply, and also the reservoir, are located in the midst of the Salina shales. In some places these shales contain notable quantities of gypsum, many times quite large masses of selenite.

Go to article

The Solubility And Heat Of Solution Of Succinic Acid In Water And The Paraffin Alcohols, H. E. Fowler, J. N. Pearce Jan 1917

The Solubility And Heat Of Solution Of Succinic Acid In Water And The Paraffin Alcohols, H. E. Fowler, J. N. Pearce

Proceedings of the Iowa Academy of Science

The following is the report of an investigation undertaken for the purpose of collecting further information concerning the influence of solvent upon certain specific properties of solutions. The solvents chosen, including water, represent the lower homologues of the paraffin alcohol series.

Go to article

The Influence Of The Male On Litter Sizes, Edward N. Wentworth Jan 1917

The Influence Of The Male On Litter Sizes, Edward N. Wentworth

Proceedings of the Iowa Academy of Science

A common belief among practical breeders is that the male in multiparous species affects the number at a birth. This belief has even permeated scientific writing; many biologist apparently taking the supposed observation at face value, while others have sought biometrical proof in the various accumulations of the data regarding fertility inheritance found in biological records.

Go to article

Pioneer Plants On A New Levee. Iii., Frank E. A. Thone Jan 1917

Pioneer Plants On A New Levee. Iii., Frank E. A. Thone

Proceedings of the Iowa Academy of Science

The present paper is the third of a series of brief notes on the yearly changes in the re-vegetation of a soil area exposed by the building of a new levee in Des Moines in the spring of 1914. In the first paper the general character of the plant pioneers during the season of 1914 was discussed, with speculations as to their probable modes of travel. In the second, note was made of the replacement of the first year's dominating plant, Amaranthus retroflexus, by Chenopodium album, which gained the leadership through its earlier germination, and of the threatened overthrow of …

Go to article

Certain Features Of Rheostat Design, H. L. Dodge Jan 1917

Certain Features Of Rheostat Design, H. L. Dodge

Proceedings of the Iowa Academy of Science

Everyone who has used rheostats of the sliding-contact type has experienced inconvenience in obtaining the desired values of current and voltage. If the rheostat is connected in series with the load, small currents cannot be obtained. If the load is shunted across a portion of the rheostat on the potentiometer principle, part of the winding carries a double load and consequently only a fraction of the full current capacity is available. To secure the advantages of both methods of connection there must be a complete rewiring of the circuit. This requires time and attention and especially in the case of …

Go to article

The Address Of The President, Geo. W. Stewart Jan 1917

The Address Of The President, Geo. W. Stewart

Proceedings of the Iowa Academy of Science

As President of the Academy I now have the honor to present an address, thus reestablishing a former custom, but with appropriate regard for the necessity of brevity. Within the time of twelve minutes I propose to glance at recent progress in physics and also to discuss the function and responsibility of this Academy. The notable achievements in that science within the past few years cannot all receive mention hence it is essential that there be pointed out but a few typical eases of progress.

Go to article

The Buchanan Gravels Of Calvin And The Iowan Valley Trains, M. M. Leighton Jan 1917

The Buchanan Gravels Of Calvin And The Iowan Valley Trains, M. M. Leighton

Proceedings of the Iowa Academy of Science

In the various geological reports of counties in the Iowan area and of counties through which pass drainage lines from the Iowa area, the Buchanan gravels are classified into two phases: the upland phase and the valley phase. This classification dates back to 1898, when the Report of the Geology of Buchanan County by the late Dr. Samuel Calvin was published by the Iowa Geological Survey. In this report he set forth the conception that the upland gravels were deposited while the valleys were filled with ice and that the gravels in the terraces along the present streams were laid …

Go to article

A Note Regarding A Slight Earthquake At Iowa City, Iowa, On April 9, 1917, George F. Kay Jan 1917

A Note Regarding A Slight Earthquake At Iowa City, Iowa, On April 9, 1917, George F. Kay

Proceedings of the Iowa Academy of Science

A slight earthquake was felt distinctly by many persons at Iowa City, Iowa, on the afternoon of April 9, 1917. All of the persons who reported that they felt the shock were seated, lying down, or standing inside of buildings when the shock was detected. Those who were on the higher floors of buildings reported more distinctive evidences of the shock than did those who were nearer to the ground.

Go to article

The Origin Of The St. Peter Sandstone, Arthur C. Trowbridge Jan 1917

The Origin Of The St. Peter Sandstone, Arthur C. Trowbridge

Proceedings of the Iowa Academy of Science

Originally, all sedimentary rocks were thought to be marine. When the St. Peter sandstone was first recognized as a distinct formation, it was assumed to have had a marine origin. More recently, however, the marine origin of many sediments has been doubted, and the criteria for distinguishing various sorts of sedimentary rocks have been worked out. As early as 1907 evidences were presented for the eolian origin of the St. Peter sandstone, although there are those who have never accepted the evidence as conclusive. In the literature of the subject, the matter is not settled.

Go to article

The Morphology Of The Thallus And Cupules Of Blasia Pusilla, Marguerite B. Rohret Jan 1917

The Morphology Of The Thallus And Cupules Of Blasia Pusilla, Marguerite B. Rohret

Proceedings of the Iowa Academy of Science

First mention of the genus Blasia was made by Micheli Nov. Pl. Gen. 1729. Linnaeus recognized the genus and added the specific name pusilla in his Species Plantarum 1753 p. 1138. In 1759 Schmidel wrote his ''Dissertatio de Blasia.'' Hooker 1816 called the plant Jungermannia blasia but as this classification is much too broad it is not used today. Gottsche 1828 published an account of the germination of the spores of Blasia piusilla. Later Grönland published his investigations of spore germination in the leafy Jungermanniae, including Blasia in his discussion. In 1833, Nees von Esenbeck made some investigations on vegetative …

Go to article

The Separation And Gravimetric Estimation Of Potassium, S. B. Kuzirian Jan 1917

The Separation And Gravimetric Estimation Of Potassium, S. B. Kuzirian

Proceedings of the Iowa Academy of Science

The market value of chloroplatinic acid, particularly under present conditions, is so high as to warrant a careful search for some cheaper reagent for the determination of potassium. Serullas, as early as 1831, proposed taking advantage of the insolubility of potassium perchlorate in concentrated alcoholic solutions and applying it as a reagent for the estimation of potassium. Unfortunately his proposal did not receive the attention it deserved because a convenient method for the preparation of perchloric acid had not at that time been worked out. Lately, Kreider elaborated a method for the preparation of perchloric acid in large enough quantities …

Go to article

First Prev Next Last