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Some Observations Of The Boiling Point Of Ternary Liquid Mixtures, John Dunham, W. C. Oelke
Some Observations Of The Boiling Point Of Ternary Liquid Mixtures, John Dunham, W. C. Oelke
Proceedings of the Iowa Academy of Science
An exposition of an apparatus for the determination of the boiling points of liquid mixtures under constant pressure, and the results of preliminary investigations upon ternary mixtures of some common organic liquids.
The Removal Of Fluorine From Drinking Waters In The State Of Iowa, C. A. Kempf, D. A. Greenwood, V. E. Nelson
The Removal Of Fluorine From Drinking Waters In The State Of Iowa, C. A. Kempf, D. A. Greenwood, V. E. Nelson
Proceedings of the Iowa Academy of Science
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) have contributed greatly to our knowledge of the distribution of fluorine in drinking waters and the effect of such waters in the production of mottled enamel of the teeth. Smith, Lantz, and Smith (1), of the University of Arizona, were the first to show that this tooth defect is due to fluorides in the drinking water; they have analyzed the fluoride concentration of waters …
The Alkaline Decomposition Of Wool Keratin, Mildred Barr, Rachel Edgar
The Alkaline Decomposition Of Wool Keratin, Mildred Barr, Rachel Edgar
Proceedings of the Iowa Academy of Science
The alkaline hydrolysis of wool keratin effected in ten hours at 25°, 40°, and 55°C. has been followed by determination of the weight, nitrogen, sulfur, and wet breaking strength of the residual wool fabric. The decrease in weight, nitrogen, sulfur, and wet breaking strength and the ratio of the sulfur of the hydrolysate to that of the residual wool have been shown to be greater, the greater the concentration of alkali or the greater the temperature. The weight of the residual wool has been shown to be a linear function of the alkali concentration, the nitrogen and sulfur to be …
Pyridine And Quinoline Derivates Of Dibenzofuran, And Their Physiological Properties, Willard H. Kirkpatrick, Henry Gilman
Pyridine And Quinoline Derivates Of Dibenzofuran, And Their Physiological Properties, Willard H. Kirkpatrick, Henry Gilman
Proceedings of the Iowa Academy of Science
A study is in progress of the physiological properties, particularly the narcotic action, of amino and substituted aminodibenzofurans and their nuclear reduction products. The amino compounds in many cases are cyclicized to give pyridino-dibenzofurans. Simple illustrations of parent types are the quinolines derived by Shraup and other syntheses from the amino dibenzofurans and their reduction products. The nitrogen cycles have been extended to include bridging of rings which vary both in kind and position of substituents as well as in degree of nuclear reduction.
Some Observations On The Thermal Springs Of The Southeastern Black Hills Of South Dakota, P. Murray Work
Some Observations On The Thermal Springs Of The Southeastern Black Hills Of South Dakota, P. Murray Work
Proceedings of the Iowa Academy of Science
The thermal springs to be discussed occur in the southeastern portion of the Black Hills in the east-central part of T. 7. S., R. 5 E. in and near the city of Hot Springs, and in Sec. 20, T. 8 S., R. 5 E. near the town of Cascade Springs, Fall River County, South Dakota.
Cycles Of Erosion In The Central Black Hills, P. Murray Work
Cycles Of Erosion In The Central Black Hills, P. Murray Work
Proceedings of the Iowa Academy of Science
While inspecting some placer gold deposits in the Central Black Hills during the Spring of 1933, the author noticed that the erosional history of this area appeared to differ from that of the Northern Black Hills as described by Dr. Louise A. Fillman. The location of the area is in T. 1 N., R. 3 E.; T. 1 N., R. 4 E.; and the southern one-third of T. 2 N., R. 4 E. along Castle Creek, Slate Creek, and Rapid Creek, and the divides between Rapid and Castle, Castle and Slate, and Slate and Spring creeks.
What Is The Loveland Loess?, Charles Keyes
What Is The Loveland Loess?, Charles Keyes
Proceedings of the Iowa Academy of Science
When a stratified, loess-like gumbo, occurring along the Missouri River above Council Bluffs, was first described by Bohumil Shimek, and named by him the Loveland loess, it was thought by him to be a fluvio-glacial deposit. Such gumbo-loess since turned out to be really a lacustrial deposition, wind-blown dusts, from the dry plains and southwestern deserts, laid down in local bodies of water, or ponds. In the description of the Loveland exposures Shimek unwittingly gives key to its age and stratigraphical setting, that is quite different from what he surmised. A layer of widespread, volcanic ash intersects the section on …
A Study Of Laboratory Teaching, J. W. Woodrow
A Study Of Laboratory Teaching, J. W. Woodrow
Proceedings of the Iowa Academy of Science
A committee was appointed in 1930 at Iowa State College to make a study of methods of laboratory instruction. This study has brought out some rather interesting information which it is thought may be of general interest. Some of the more interesting problems considered by the committee are; length of laboratory period, demonstration laboratory, size of section, correlation between laboratory and recitation, organization of course, equipment and qualifications of a good laboratory instructor.
Respiratory Mechanism Of Blocked And Normal Embryonic Cells (Orthoptera), J. H. Bodine, E. J. Boell
Respiratory Mechanism Of Blocked And Normal Embryonic Cells (Orthoptera), J. H. Bodine, E. J. Boell
Proceedings of the Iowa Academy of Science
Two types of response to the action of carbon monoxide and cyanide are noted in the respiration of the embryo of the grasshopper, Melanoplus differentialis.
Scotch Pine (Pinus Sylvestris) As A Member Of The Iowa Flora, Guy West Wilson
Scotch Pine (Pinus Sylvestris) As A Member Of The Iowa Flora, Guy West Wilson
Proceedings of the Iowa Academy of Science
On a recent visit to the southwestern portion of Des Moines County a most interesting discovery was made. Near the county line, but on the Henry county side was formerly a large grove of the Scotch Pine (Pinus sylvestris L.). The trees were planted in the early days and have developed into extra-large specimens. In fact a large part of the plantation has already found its way to the saw mill. To the northeast in Danville township of Des Moines County is a considerable tract of timber which is not pastured as heavily as is the rule in Iowa at …
The Use Of Electron Tubes As Super-Sensitive Relays, W. C. Oelke
The Use Of Electron Tubes As Super-Sensitive Relays, W. C. Oelke
Proceedings of the Iowa Academy of Science
A brief discussion of the use of electron tubes in relay circuits controlling physical apparatus. The construction and operation of several relay units were shown.
A Progress Report Of A Survey Of The Insects Of Iowa, H. E. Jaques
A Progress Report Of A Survey Of The Insects Of Iowa, H. E. Jaques
Proceedings of the Iowa Academy of Science
Considerably more than one half of all the known species of living things are insects. These make vital contact with man at every angle of his living. Crops are raised, possessions of many kinds are kept, health of man and beast is maintained and many other activities made successful only after a combat with insect enemies. A knowledge of the insect life of a region is highly desirable not only for its economic relationships, but because of still greater value as a pure science problem. Since Iowa stands at the focus of a great mid-west faunal region, a knowledge of …
The Foliar Embryos Of Tolmiea Menziesii, John A, Yarbrough
The Foliar Embryos Of Tolmiea Menziesii, John A, Yarbrough
Proceedings of the Iowa Academy of Science
A careful study has been made of the developmental history of the leaf borne shoot and roots of Tolmiea Menziesii. Comparisons of these formations with similar ones appearing on leaves of Bryophyllum calycinum are considered.
Further Studies On The Nutritive Value Of Alcohol-Extracted Animal Tissues And The Supplements Required For Growth And Lactation, Walter H. Seegers, H. A. Mattill
Further Studies On The Nutritive Value Of Alcohol-Extracted Animal Tissues And The Supplements Required For Growth And Lactation, Walter H. Seegers, H. A. Mattill
Proceedings of the Iowa Academy of Science
In order to reveal more clearly the nutritive value of beef heart, kidney, round, and liver, these tissues, after hot alcohol extraction, were incorporated at a 15 per cent protein level in a ration adequate in the recognized factors necessary for normal nutrition. A simultaneous study of the whole dried tissues, at the same level of protein intake, revealed that rats fed the whole tissue made better gains than those on the respective extracted tissues. In those groups receiving the extracted material the most rapid growth was on kidney, and the poorest on liver, while round and heart gave intermediate …
Title Page - Front Matter
Proceedings of the Iowa Academy of Science
No abstract provided.
Trials With A Bacteriological Method For Measuring Available Phosphorus In Soils, F. B. Smith, P. E. Brown, C. C. Mensing
Trials With A Bacteriological Method For Measuring Available Phosphorus In Soils, F. B. Smith, P. E. Brown, C. C. Mensing
Proceedings of the Iowa Academy of Science
The basis of most laboratory tests for determining the availability of plant food constituents in soils is the assumption that the materials dissolving in some particular solvent are available for plant use. Crop growth, however, has not always been correlated with the solubility of the constituents and various solvents have been employed in the attempt to obtain a definite correlation. One of the first methods proposed for determining the availability of phosphorus in soils consisted in the determination of the phosphorus extracted from the soil by a 1 per cent solution of citric acid. It was claimed that the root …
Hydrolysis Of Phenyl Furyl Ketimine - The Relative Negativity Effect, J. B. Culbertson, Leonard Hines
Hydrolysis Of Phenyl Furyl Ketimine - The Relative Negativity Effect, J. B. Culbertson, Leonard Hines
Proceedings of the Iowa Academy of Science
Phenyl furyl ketimine hydrochloride has been prepared and the velocity of its hydrolysis to the corresponding ketone measured. The velocity constant has been found to be of the order of l0xl0-3 measured at 25°C. The constant for diphenyl ketimine hydrochloride is 5.5x103measured at 0° or about 50x10-3 when calculated to 25 °. In view of the generally considered more highly negative character of the furyl radical over the phenyl, this result is in line with an observed rule that the ketimine salts are more resistant to hydrolysis the more negative the radicals attached to the carbimino …
The Ledges And Pennsylvanian Problems In Iowa, John E. Smith
The Ledges And Pennsylvanian Problems In Iowa, John E. Smith
Proceedings of the Iowa Academy of Science
The geological location of the Ledges in the state, the kinds of rock found there and their arrangement together with their structural features and some other factors, suggest a number of problems concerning the Pennsylvanian system of rocks in Iowa. Some of these problems are pointed out and discussed in this paper.
Proceedings Of The Forty-Eighth Annual Meeting Of The Iowa Academy Of Science, Held At Des Moines, April 20 And 21, 1934: Minutes Of The 1934 Meeting; Staff & Committee Reports
Proceedings of the Iowa Academy of Science
No abstract provided.
Aluminum In Nutrition, H. H. Keil, V. E. Nelson
Aluminum In Nutrition, H. H. Keil, V. E. Nelson
Proceedings of the Iowa Academy of Science
Only a few of the large number of papers on aluminum in nutrition have considered the effect of this element on reproduction and lactation. McCollum, Rask, and Becker (1), Myers and Mull (2), Lyman and Scott (3), and MacKenzie (4) reported no ill effects on reproduction and lactation from the addition of aluminum to the diet. The amounts of the element ingested varied from 0.02 per cent to 0.12 per cent, usually as potassium or sodium aluminum sulphate; although McCollum and co-workers employed A1Cl3 as the source of Al. Schaeffer and co-workers (5), using alum phosphate baking powder in …
Reconstruction Of Iowa's Cretaceous Stratigraphy, Charles Keyes
Reconstruction Of Iowa's Cretaceous Stratigraphy, Charles Keyes
Proceedings of the Iowa Academy of Science
Notwithstanding the facts that it was in Iowa rocks of Cretaceous age were first recognized in this country, and that the Meek and Hayden now famous, or type, section of the rocks of this age for the continental interior was constructed along the Missouri River, the stratal succession of this region is not genetic expression of the actual sedimentation. The Iowa section is really far from being a characteristic development of the provincial series. The Cretaceous depositions have to be viewed as the product of a great mediterranean sea, of which the black-mud body now variously called the Benton, Pierre, …
Iowa State Teachers College Program Of Recitations, Winter 1933-1934, Iowa State Teachers College
Iowa State Teachers College Program Of Recitations, Winter 1933-1934, 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.
Some Factors Influencing The Respiration Of Rhizobium, D. Wynne Thorne, R. H. Walker
Some Factors Influencing The Respiration Of Rhizobium, D. Wynne Thorne, R. H. Walker
Proceedings of the Iowa Academy of Science
In the first isolation of the bacteria infecting the roots of the Leguminosae, Beijerinck found that the common meat-peptone gelatin substrate is not well adapted to their growth; but that a medium, very suitable for their culture, consists of a water extract of legume leaves, 0.25 per cent asparagin; 5 per cent sucrose and 7 per cent gelatin. Later he modified this medium by making a more concentrated legume extract from pea seedlings and omitting the asparagin. At about the same time Breal found that a water extract of the roots of legumes also favors the growth of these organisms. …
Origin And Development Of The Vascular Bundle Of Zea Mays L., Arthur L. Hershey
Origin And Development Of The Vascular Bundle Of Zea Mays L., Arthur L. Hershey
Proceedings of the Iowa Academy of Science
A longitudinal section of a corn stem thirty to forty days of age shows that the majority of the various primordia of the plant have been differentiated. All nodes are formed but packed very closely together (less than one inch in length); the apex of the stem is differentiating to form the tassel; the leaves are well differentiated and wrapped very tightly about the young staminate inflorescence; eight to ten buds are visible in the axils of the leaves; and vascular bundles exist in all stages of differentiation and development. The bundles in the base of the stem are differentiated …
Thiele's Theory Of Partial Valency In Terms Of Electrons, Francis Earl Ray
Thiele's Theory Of Partial Valency In Terms Of Electrons, Francis Earl Ray
Proceedings of the Iowa Academy of Science
Scientific theories generally have a long and difficult road to travel before gaining acceptance. It is, therefore, somewhat surprising to find that Thiele's theory of partial valency gained such ready recognition. This was undoubtedly due to the fact, as the saying goes, that it filled a long felt want. As time went on and chemists learned more about valence there arose a tendency to question the existence of such a thing as a "partial" valence. But as no alternative explanation was forthcoming to explain the phenomena that Thiele's theory explained so well, no great inroads were made against his hypothesis.
The Development Of The Pronephros In The Californian Newt (Triturus Torosus), Gardner M. Riley
The Development Of The Pronephros In The Californian Newt (Triturus Torosus), Gardner M. Riley
Proceedings of the Iowa Academy of Science
The development of the pronephros and its relation to the subsequent differentiation of other parts of the urogenital system has been studied by descriptive and experimental methods.
The Significance Of Carbon Dioxide In Making Phosphorus Available In The Soil, H. C. Miller, F. B. Smith
The Significance Of Carbon Dioxide In Making Phosphorus Available In The Soil, H. C. Miller, F. B. Smith
Proceedings of the Iowa Academy of Science
Various investigators have shown that the soil atmosphere possesses a higher concentration of carbon dioxide when a legume is grown than when a non-legume is grown. The beneficial effects to crops following certain legumes have been attributed in part, at least, to the carbon dioxide evolved by the roots of the legumes. The significance of carbon dioxide in the soil air in breaking down minerals and making phosphorus available to plants, is an important question from the practical standpoint.
Studies On Vitamins B And G, J. F. Feaster, V. E. Nelson
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
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 …