Digital Commons Network^™

Studies On Vitamins B And G, J. F. Feaster, V. E. Nelson

Proceedings of the Iowa Academy of Science

Considerable data have accumulated during the last decade on the role of diet in reproduction and rearing of young. The problem is an important one and merits careful consideration, because of the relation between the results on animal experiments and infant mortality and failure of milk secretion in the human and domestic animals.

Utilization Of The Navajo Country, Albert B. Reagan

Proceedings of the Iowa Academy of Science

The Navajo Country occupies northeastern Arizona and parts of Utah and New Mexico. The eastern boundary of the region is the 108th meridian. The boundaries on the other three sides are the valleys of the large rivers - the San Juan, the Colorado, and the Little Colorado and Puerco, natural boundaries that have long been recognized by the native tribes, the whole area lying approximately between parallels 34° 55' and 37° 17' and meridians 108° 45' and 111° 45'. The region thus outlined contains approximately 25,725 square miles, or an area a little larger than Connecticut, Delaware, Massachusetts, Vermont, and …

Table Of Contents

Proceedings of the Iowa Academy of Science

No abstract provided.

Some Methods Of Labeling Nature Trails, John Moore

Proceedings of the Iowa Academy of Science

For several years the students of botany of Iowa Wesleyan College have maintained a nature trail in the Oakland Mills State Park. The writer is one of the three students appointed to take care of this work for the current year. When the trails were first inaugurated it was necessary to select the course, lay out the path and erect signs to keep the visitors going in the right direction, as well as to label items of interest. Now through the activity of the C.C.C. workers, permanently constructed paths run through the highly interesting parts of the park and one …

Notes On The Life History Of Aphanizomenon Flos-Aquae, E. T. Rose

Proceedings of the Iowa Academy of Science

Aphanizomenon flos-aquae for the past few years has been an extremely serious pest in a number of the lakes of northwestern Iowa. Curiously enough, this common blue-green alga has not received much attention other than taxonomic technicalities. This paper deals chiefly with the life history and economic importance of this, and other algal pests.

The Basidium, Donald P. Rogers

Proceedings of the Iowa Academy of Science

The current systems of classification of the basidiomycetes tend to attribute greater weight to the structure of the fruiting-body than to basidial morphology. Actually, basidial morphology is the more fundamental character. When the basidium is considered in the light of Neuhoff's hypo-, epibasidium and Donk's pro-, metabasidium concepts, homologies appear which furnish the basis for a natural arrangement of the class. Such an arrangement follows the general groupings proposed by Patouillard of Hetero- and Autobasidiomycetes and of Hymeniales and Gasteromycetes. The relationships, mutual and within the groups, of Patouillard's divisions receive greater meaning from such a consistent morphological and phylogenetic …

The Effect Of Fluorine On Blood And Respiration, D. A. Greenwood, E. A. Hewitt, V. E. Nelson

Proceedings of the Iowa Academy of Science

Much interest has been manifested in fluorine during the past few years. This is due to two reasons: first, fluorine is found in several phosphatic mineral supplements, which are fed to farm animals ; and, second, fluorine has been found in drinking waters in this and many other countries of the world. The interest of the authors in fluorine dates from the discovery by Ostrem, Nelson, Greenwood, and Wilhelm of fluorine in the drinking waters of communities in the State of Iowa, with the resulting production of mottled enamel of the teeth. There can be no question that fluorine in …

Alcohol Motor Fuels, Leo M. Christensen, R. M. Hixon, E. I. Fulmer

Proceedings of the Iowa Academy of Science

The proposal to encourage the use of power alcohol made from farm crops grown in the Continental United States, as an aid to agriculture, is not new. Since the last consideration, something more than ten years ago, anhydrous ethyl alcohol has become commercially available. This development makes it feasible to use alcohol-gasoline mixtures. The power alcohol project is thus placed upon a new basis and is worthy of a new consideration.

Reduction Of Furan And The Preparation Of Tetramethylene Derivatives, Donald F. Starr, R. M. Hixon

Proceedings of the Iowa Academy of Science

During the study of the nitrogen heterocyclics, a convenient method of preparing δ-chlorovaleronitrile was desired. The synthesis developed involved the procedure of Gilman and Louisinian for decarboxylation of furoic acid. The furan obtained was reduced in the presence of palladous oxide palladium black giving a 95 per cent yield of tetrahydrofuran which was split with hydrogen chloride yielding 55 per cent of the theoretical tetramethylene chlorohydrin. Treatment of the chlorohydrin with phosphorus tribromide gave a 98 per cent yield of tetramethylene chlorobromide which gave a 52 per cent yield of δ-chlorovalero nitrile when reacted with sodium cyanide. The chemicals required …

The Production Of Kynurenic Acid From Tryptophane And Indole Derivatives, Lyle C. Bauguess, Clarence P. Berg

Proceedings of the Iowa Academy of Science

The production of kynurenic acid from derivatives closely related to tryptophane serves as a means of indicating whether the animal organism is able to accomplish the changes necessary to convert such derivatives into tryptophane itself, or into some product intermediate in the transformation of tryptophane to kynurertic acid. With this in mind, a number of l-tryptophane and indole derivatives were prepared and administered to rabbits, both per os and subcutaneously, in amounts molecularly equivalent to 1 gm. of tryptophane and the kynurenic acid produced was estimated.

Effects Of Ultracentrifuging On Certain Cell Structures, R. L. King, H. W. Beams

Proceedings of the Iowa Academy of Science

Extremely great centrifugal forces may be obtained by the use of the air-driven ultracentrifuge developed by J. W. Beams and his associates. Such forces afford a means of testing the viscosity and relative specific gravity of many cell components. The authors have been able to establish the fact that the Nissl bodies of rat ganglion cells represent a definite material in the cell and are not the result of the action of the fixative used on homogeneous cytoplasm; likewise, for the Golgi material in the uterine gland cells of the guinea pig. In general the chromatin has been shown to …

Notes On The Hatchability And Infectivity Of Refrigerated Eggs Of Fasciola Hepatica Linn, Wendell H. Krull

Proceedings of the Iowa Academy of Science

The problem of the longevity of trematode eggs, particularly of those which have been kept for varying periods of time at low temperatures to retard development is, apparently, one which has not been investigated to any great extent. It is, nevertheless, admitted that literature on such a subject is difficult to find and it may be far more extensive than the following survey would indicate.

Studies Of The Electromotive Force In Biological Systems: Iv. The Effect Of Carbon Monoxide On The E. M. F. Of Frog Skin, A. B. Taylor, Edgar John Boell

Proceedings of the Iowa Academy of Science

Using a method similar to that previously reported by Steinbach (1933), Pumphrey and Francis (1933), and others the authors have studied the effect of different carbon monoxide-oxygen mixtures upon the inherent E. M. F. of pieces of isolated frog skin.

A New Character In The Guinea Pig - "Silvering", W. V. Lambert

Proceedings of the Iowa Academy of Science

Silvering is a recessive character that manifests itself by the appearance of many white hairs in the fur, chiefly on the back and sides. At birth the character is not apparent, gray hairs first appearing on the posterior region of the back when an animal is about four months old. The number of gray hairs increases after this age for the next three or four months. In high grade silvers there is a progressive increase in the amount of graying until the animal is about a year old.

A Study Of The Inheritance And The Physiological Behaviour Of Dwarfism Associated With An Eye Defect In Rats, A. Sciuchetti, W. V. Lambert

Proceedings of the Iowa Academy of Science

Four dwarfed rats recently appeared in two separate closely related litters of an inbred strain of rats in our colony. There was associated with the dwarfed condition a marked opacity of the eyes apparently causing blindness.

Rico, Francis A. Talarico

Purple Pen

No abstract provided.

Iowa State Teachers College Program Of Recitations, Fall 1933, 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 Purple Pen, Volume 5, Number 2, February 1933 [Download Entire Issue]

Purple Pen

No abstract provided.

A Day In A Life, Gladys Talcott

Purple Pen

No abstract provided.

Iowa State Teachers College Program Of Recitations, Winter 1932-1933, 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.

Reinfection Of Rats With Eimeria Miyairii After Immunization, E. R. Becker, Phoebe R. Hall

Proceedings of the Iowa Academy of Science

It was shown in previous paper (1932) that rats which had not previously been infected became immune to Einzcria. miya.irii after recovery from an infection produced by ingesting 1500 oocysts daily for five days. It was also stated that in the passing of the weeks some of the immunity was lost. The latter statement was based upon an experiment with four rats which showed the last coccidia on September 25, 1931, and which could not be reinfected immediately, but which again became infected after ingesting large numbers of oocysts on December 12, 1931, - about 78 days after the last …

College Catalog 1932-1933, Iowa State Teachers College

UNI Programs and Courses Catalogs

Table of Contents

College Calendar for the Year 1933-34 ... 5
State Board of Education ... 6
Officers of Administration and Instruction ... 7
General Information
Historical Sketch ... 25
Buildings and Grounds ... 25
Enrollment and Registration ... 28
Expenses
Fees ... 28
Room and Board in Bartlett Hall ... 29
Room and Board in Accredited Rooming Houses ... 30
Scholarships ... 30
Employment of Students ... 30
Student Organizations ... 31
Control of Extra-Curricular Activities ... 32
Placement Bureau ... 32
General Regulations
Entrance Requirements ... 33
Admission with Advanced Standing ... 34
Advisers and Amount of Work …

Blood Volume In Single And Parabiotic Rats, Robert T. Hill

Proceedings of the Iowa Academy of Science

The method described in this paper for the measurement of blood volume in rats is very similar to that used by H. P. Smith in his blood volume determinations on dogs.

Some Properties Of Vitamin E Concentrates, H. S, Olcott

Proceedings of the Iowa Academy of Science

Preparations of vitamin E were obtained from lettuce and from wheat germ oil by fractional crystallizations of the unsaponifiable lipids. Still further concentrated fractions were obtained from the lettuce unsaponifiable lipids by fractional distillation in vacuo. The fraction collected from 190-220° (0.1 mm.) was the most active. After the removal of traces of sterols and other solid alcohols by crystallization from acetone, 10 mg. were sufficient, when fed to a female rat deficient in vitamin E, to allow the birth of a normal litter. Concentrates so obtained were resin-like material which would not crystallize. Some of the physical and chemical …

The Occurrence Of Mottled Enamel In Iowa, Carl T. Ostrem, D. A. Greenwood, H. A. Wilhelm, Victor E. Nelson

Proceedings of the Iowa Academy of Science

Mottled enamel is a peculiar condition of the teeth. The teeth become chalky white in appearance and lack the lustre and translucency observed in the enamel of normal teeth. They are generally stained in an irregular manner and the dark brown stain supposedly accumulates between the enamel rods. However, some individuals have severe mottling of the enamel with little or no stain. We do not know the nature of the substance responsible for the stain. The teeth become soft and the dentist experiences difficulty with the teeth retaining fillings. It is not known for certain if mottled teeth decay more …

Proceedings Of The Forty-Seventh Annual Meeting Of The Iowa Academy Of Science, Held At Cedar Rapids, April 21 And 22, 1933: Minutes Of The Meeting; Staff & Committee Reports

Proceedings of the Iowa Academy of Science

No abstract provided.

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

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.

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

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.