Digital Commons Network^™

The Synthesis Of Vitamins By Microorganisms, Gertrude Sunderlin, C. H. Werkman

Proceedings of the Iowa Academy of Science

The synthesis of vitamin B is of general occurrence among microorganisms. Negative results of some investigators may be accounted for by inadequate amounts fed or too limited feeding periods. Our experiments showed the following organisms to elaborate vitamin B when tested by the rat weight test: Saccharomyces cerevisiae, Torula rosea, Oospora lactis, Bacillus adhaerens, Bacterium coli (three strains), Bacillus subtilis and Bacillus mycoides.

Table Of Contents

Proceedings of the Iowa Academy of Science

No abstract provided.

Proceedings Of The Forty-First Annual Meeting Of The Iowa Academy Of Science, Held At Iowa City, May 6 And 7, 1927: Minutes Of The Meeting; Staff & Committee Reports

Proceedings of the Iowa Academy of Science

No abstract provided.

Some Physico-Chemical Effects Of Organic Soil Colloids, Walter F. Loehwing

Proceedings of the Iowa Academy of Science

An investigation was undertaken to determine the reason for injurious effects of lime to grains grown on certain acid organic soils which occur in the Great Lakes region. Analyses were made of the soils (table I) and crops (table II) in order to determine if a harmful physical change occurred in the soils after liming or if lime was chemically injurious. The organic soils studied were black, powdery, acid and deficient in potash as shown by the soil analyses. Crop injury following use of lime to correct acidity in these soils is an unexpected response which occurs frequently enough to …

The Physiographic Ecology Of A Wisconsin Drift Lake, Lois A. Catlin, Ada Hayden

Proceedings of the Iowa Academy of Science

In Iowa, practically all of the swamp land and many of the smaller lakes with which the early pioneers were familiar have been drained and there agricultural crops are grown. Whether the greatest economic benefit may be derived from appropriating for agricultural purposes such a small proportion of the land as lake beds represent, or by conserving and developing their natural resources is a subject for consideration. With one exception (that of Wall Lake in Wright County), Little Wall Lake is the only lake of any size within an area with radius of at least fifty miles, and in view …

The Adsorption Of Certain Vapors By Charcoal At Various Temperatures Up To And Above Their Critical Temperatures, J. N. Pearce, C. M. Knudson

Proceedings of the Iowa Academy of Science

It is perhaps safe to state that no one property of a solid substance has been more persistently studied through so long a period as has been the property of solid porous bodies to adsorb gases and vapors. The phenomenon of the adsorption of gases and vapors by charcoal was originally discovered independently by Scheele¹ and by Fontana¹ in 1777. In the century following much was contributed which deals with the general qualitative side of adsorption. It was not until the beginning of the present century and more particularly with the advent of poison gas warfare and the …

An Investigation Of The Objective Examination Questions In A First Year College Physics Course, Dorothy H. Helmick

Proceedings of the Iowa Academy of Science

The purpose of this study is an evaluation of the efficiency of the objective-type examination questions used in the College Physics course at Drake University during the first semester 1926-27. Ninety-nine students enrolled in the course, and eighty-one took the final examination.

A Study Of Physics Teaching In Iowa High Schools, Alice Seeds, Rex Hancox, John W. Chittum

Proceedings of the Iowa Academy of Science

It is a matter of common knowledge that many Physics teachers in Iowa are not efficient because of their lack of training, and that many do not have what we would consider the minimum amount of training necessary to teach Physics in high school. It is taken for granted that teachers in small towns may be more poorly prepared than those in larger cities (though there are many exceptions to this). In this survey we have treated only of teachers in towns of 1000 or more population. All of the data is divided into three groups: group A includes towns …

A New Instrument For The Determination Of Young’S Modulus, T. G. Mehlin

Proceedings of the Iowa Academy of Science

The apparatus used for the determination of Young's modulus in the elementary laboratory at Drake has been the vertical suspended wire type, in which the sample under test is loaded and readings taken directly by means of a vernier attached to the wire. Although the readings are accurate to one one-hundredth of a centimeter, the scale cannot be conveniently read, the measurement of the length of the wire necessitates the use of a ladder, and the heavy weights are not easily handled. It is hoped that this new instrument will facilitate the experiment, although it is recognized that the weight …

The Dark Ring Nebula In Cygnus, D. W. Morehouse

Proceedings of the Iowa Academy of Science

Since my report on the Dark Ring Nebula in Cygnus,¹ I have received the following communication from Dr. R. H. Curtiss, Acting Director of the Detroit Observatory of the University of Michigan: "Your article in the February Popular Astronomy on a dark ring nebula in Cygnus has led me to look up an excellent slide which we have of that region made from a photograph secured with the 6-inch Willard Lens on October 5, 1893, at Lick Observatory. The dark elliptical ring stands out very beautifully on this slide. I think anyone would notice it but would be strongly …

On The Dynamics Of A Spherically Symmetric Molecule, J. V. Atanasoff

Proceedings of the Iowa Academy of Science

An attempt is made to postulate a molecular type which bears some relationship to the known facts of monoatomic molecular structure, yet which is simple enough to allow its kinetic theory to be worked out. The molecule chosen consists of a positive nucleus, surrounded by a negatively charged spherical shell. Developments of the distance-force relationship, and of an equation of state are given.

Departure From Hooke's Law In The Torsion Of Rods, George Singer, Edwin Steele

Proceedings of the Iowa Academy of Science

In an experimental study of the behavior of an iron rod fixed at one end and subjected to torsion at the other it was found that there is a marked tendency of the rod to remain in the state of strain which it has acquired. When the torque was raised to a relatively high value and then reduced to zero the strain tended to remain. It was found to disappear in about twenty-four hours however. The residual strain in the rod is evidently the result of the reluctance of the metal to change its molecular arrangement.

Plan For Reorganization Of Secondary School Physics Material, Russel D. Miller

Proceedings of the Iowa Academy of Science

There is a growing demand for a revision of secondary school curricula made on the basis of present day aims of education. The objectives that are almost universally accepted and upon which this revision should be based are as follows: to assist in the production and maintenance of health; to develop and maintain a high standard of social and civic relationships; to make one's chosen vocation more enjoyable and successful; to assist in the proper use of leisure time. In the reorganization, outlined in this paper, an attempt is being made to select the material which will contribute, directly or …

Ball And Jet In A Vacuum, L. B. Spinney

Proceedings of the Iowa Academy of Science

A report on an experimental and theoretical investigation of the equilibrium conditions for the case of a ball balanced on a jet of water.

Thermo-Electric Effect In Single Crystal Zinc, Ernest G. Linder

Proceedings of the Iowa Academy of Science

Data are presented on the thermal e.m.f. against copper of six single crystal wires of zinc, of which the orientations of the main crystallographic axis with respect to the wire axis, range from 11.4° to 90°. The temperature interval is from -182° to 475° C. From the data are calculated the thermo-electric power, Peltier coefficient, and difference of the Thomson coefficients for Zn against Zn. The data also provide a test for the Voigt-Thomson law for the variation of the thermo-electric power with crystal orientation. The law is verified for the low temperatures, but the deviations at the high …

Polarization Of Resonance Radiation And Breadth Of Spectral Lines, A. Ellett

Proceedings of the Iowa Academy of Science

Observations of the polarization of the D line resonance radiation of sodium indicate that the transition probabilities for the various components of the Zeeman pattern are substantially in agreement with the predictions of the so-called sum rule. Observations in relatively strong fields show the effect of non-uniform distribution of intensity in the exciting spectral line. The assumption that the distribution of energy in the exciting line is due practically entirely to Doppler effect leads to equations for the variation of polarization with field strength which are well verified experimentally. Any broadening of the line by collision or by a coupling …

Polarization Of Λ2537 Of Mercury, Harry F. Olson

Proceedings of the Iowa Academy of Science

1 S - 2 p₂ of mercury excited by plane polarized light shows 79% polarization both in the absence of any magnetic field and in the presence of a field parallel to the electric vector. That the polarization is not complete might be interpreted as clue to collisions but more probably is clue to the fact that in weak fields some of the fine components of λ 2537 have not the same Zeeman pattern as in strong fields. The polarization with other relative orientations of field and light vector and the variation of polarization with field intensity in weak …

Study Methods Of College Students In Relation To Intelligence And Acheivement, Nira M. Klise

Proceedings of the Iowa Academy of Science

This paper is an account of methods used in study by approximately 500 students at Iowa State College. The questionnaire method was used, and in the paper results obtained from students in both the highest and lowest fourth of the entire group in intelligence rating, are compared.

Apparatus And Procedure Used In Determining The Nature Of Beating Intertones, Ingvald B. Hauge

Proceedings of the Iowa Academy of Science

Best results are obtained by using two electrically driven forks whose pitches are 256 dv. and 245 dv. when the currents admitted to each fork are regulated by means of rheostats. All the apparatus is placed in a sound-proof room; tubes conduct the sound to another room where the Os observe. The essential part of the procedure consists in varying the intensities of vibration of the two forks by means of the rheostats and getting introspective descriptions of what is heard in each situation.

Index

Proceedings of the Iowa Academy of Science

No abstract provided.

College Circular [Catalog] 1927, Iowa State Teachers College

UNI Programs and Courses Catalogs

Table of Contents

Calendar for 1927-28 ... 5
Officers of Administration and Instruction ... 6
Faculty ... 7
General Information ... 45
Expenses and Fees ... 46
Scholarships ... 48
Extension Service ... 48
College Organizations ... 48
Faculty Organizations ... 49
Training in Actual Teaching ... 49
Public Lectures and Entertainments ... 50
Boarding and Lodging ... 50
Employment of Students ... 51
Twelve Weeks Normal Training ... 52
School Credits in Lieu of Certificate Examinations ... 52
Examinations for Teachers Certificates ... 53
Bureau of Recommendations ... 53
Advisers and Amount of Work ... 53
Credits, Grades, Grade …

The Alumni News Letter, V10n4, October 1, 1926, Iowa State Teachers College

The Alumni News Letter

Contains news of the College and its alumni.

Iowa State Teachers College Program Of Recitations, Fall 1926, Iowa State Teachers College

UNI Schedule of Classes

A listing and schedule of the courses being taught as well as policies and procedures concerning attending classes at the Iowa State Teachers College.

Summer Term Commencement [Program], August 19, 1926, Iowa State Teachers College

UNI Commencement Programs

The program of the commencement ceremonies, including a list of institutional leadership, a list of the departments by college, awards given at the ceremonies, and a list of undergraduate and graduate degree candidates.

Iowa State Teachers College Program Of Recitations, Summer 1926, Iowa State Teachers College

UNI Schedule of Classes

A listing and schedule of the courses being taught as well as policies and procedures concerning attending classes at the Iowa State Teachers College.

The Alumni News Letter, V10n3, July 1, 1926, Iowa State Teachers College

The Alumni News Letter

Contains news of the College and its alumni.

Spring Term Commencement [Program], June 1, 1926, Iowa State Teachers College

UNI Commencement Programs

The program of the commencement ceremonies, including a list of institutional leadership, a list of the departments by college, awards given at the ceremonies, and a list of undergraduate and graduate degree candidates.

Souvenir Program Of The Fiftieth Commencement Of The Iowa State Teachers College, May 28 - June 1, 1926, Iowa State Teachers College

UNI Commencement Programs

The program of the commencement ceremonies, including a list of institutional leadership, a list of the departments by college, awards given at the ceremonies, and a list of undergraduate and graduate degree candidates.

Fortieth Annual Meeting Of The Iowa Academy Of Science, April 30 And May 1, 1926, Iowa Academy Of Science

Iowa Academy of Science Documents

No abstract provided.

The Alumni News Letter, V10n2, April 1, 1926, Iowa State Teachers College

The Alumni News Letter

Contains news of the College and its alumni.