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Total Length Of Stem Developed From A Single Seedling Of Cuscuta, H. L. Dean
Total Length Of Stem Developed From A Single Seedling Of Cuscuta, H. L. Dean
Proceedings of the Iowa Academy of Science
Curiosity as to the total length of stem that could be developed from a single seedling of Cuscuta promoted a series of outdoor experiments in an attempt to answer this question.
Permanent Slides Of Plant Cuticle Stained With Sudan Iv And Sudan Black B, H. L. Dean, Edwards Sybil Jr.
Permanent Slides Of Plant Cuticle Stained With Sudan Iv And Sudan Black B, H. L. Dean, Edwards Sybil Jr.
Proceedings of the Iowa Academy of Science
Sudan IV is commonly used to stain fats, oils, suberin, and cutin. Materials stained in this dye are usually mounted temporarily in glycerine and are seldom kept as permanent slides. This may be due to the fact that balsam, clarite or similar mounting media, cannot be used to make permanent slides of preparations stained in Sudan IV. The dye is immediately removed by the xylene or toulene solvent of these media, leaving the preparations colorless.
A Qualitative Study Of The Effect Of Soft X-Rays On The Activity Of B-Indolyl Acetic Acid As A Growth Substance, F. M. Turrell, Harold Kersten
A Qualitative Study Of The Effect Of Soft X-Rays On The Activity Of B-Indolyl Acetic Acid As A Growth Substance, F. M. Turrell, Harold Kersten
Proceedings of the Iowa Academy of Science
Long and Kersten (1936) found small doses of soft X-rays (long wave length) stimulate the growth of plants from seeds. Moore and Haskins (1933) observed retardation of growth of plants grown from seed irradiated with X-rays from the Coolidge tube which emanates a large proportion of hard X-rays (short wave length). Skoog (1935) has shown that 92 per cent (1000 units per cc.) hetero-auxin (B-indolyl acetic acid) in water is inactivated by hard X-rays filtered through lead, steel, and aluminum filters after exposure of 100 minutes, when the X-ray tube was operated at 3-4 milliamperes at 900 kilovolts. This raises …
Illustrations Of The Fleshy Fungi Of Iowa Iii. The Black-Spored Agarics, Joseph C. Gilman
Illustrations Of The Fleshy Fungi Of Iowa Iii. The Black-Spored Agarics, Joseph C. Gilman
Proceedings of the Iowa Academy of Science
This paper is the third of a series intended to present the common fleshy fungi of the state. The purple-brown- and white-spored groups of the gilled mushrooms were previously presented in 1940 and 1941, respectively. The mushrooms that are characterized by black spores comprise the forms described and illustrated in this paper.
Illustrations Of The Fleshy Fungi Of Iowa Iv. Common Fleshy Ascomycetes, Joseph C. Gilman
Illustrations Of The Fleshy Fungi Of Iowa Iv. Common Fleshy Ascomycetes, Joseph C. Gilman
Proceedings of the Iowa Academy of Science
Superficially the fleshy Ascomycetes may be divided into the cup fungi and the sponge-mushrooms, or morels. The latter are undoubtedly the best known edible fungi in the state, for more people recognize them as mushrooms than they do the agarics. Because they are so well-known, the common forms and the more closely related similar species were chosen for illustration.
Slime Molds Of Benzie County, Michigan, Ruth Gilman
Slime Molds Of Benzie County, Michigan, Ruth Gilman
Proceedings of the Iowa Academy of Science
This species list of the slime molds of Benzie County, Michigan represents the forty-two species collected by the author in the Birch-beech-maple-hemlock woods on the north shore of Crystal Lake. Practically all the specimens were collected either in June 1936, or during June and July, 1939, when the ground is very moist.
Notes On Iowa Flora, W. A. Anderson
Notes On Iowa Flora, W. A. Anderson
Proceedings of the Iowa Academy of Science
In her paper on Violaceae of Iowa Newbro (1936) included Viola hirsutula Brainerd. This is a small violet which grows characteristically in mixed angiosperm forests of the Appalachian region from Connecticut to Georgia. A number of Iowa specimens labeled V. hirsutula in the State University herbarium are V. nephrophylla Greene, a species which, according to Brainerd (1921), occurs from Quebec and New England westward to the Rocky Mountain region where it has a very wide range. This species was originally described from Colorado. In Iowa it seems most characteristic of our hillside bogs or fens. We have at the University …
The Cut-Leaved Nightshade (Solanum Triflorum Nutt.), Nester L. Stiles, Arthur L. Bakke
The Cut-Leaved Nightshade (Solanum Triflorum Nutt.), Nester L. Stiles, Arthur L. Bakke
Proceedings of the Iowa Academy of Science
The cut-leaved nightshade, Solanum triflorum Nutt., was found in September 1941, in Rock Township, Cherokee County, Iowa. This nightshade was discovered growing in a pasture where there was a mixture of Clarion and Marshall soil types on the top of a bluff about twenty feet high where the soil was thin and gravelly.
The Effect Of The Freezing Temperatures In December 1941 And January 1942 In Story, Boone, And Polk Counties On The Viability Of Soy Beans Of The 1941 Harvest, John N. Martin
Proceedings of the Iowa Academy of Science
Owing to the urgency of increasing the soybean production in 1942, the condition of the soybeans held in storage for the 1942 seeding is a very important matter. The very unseasonable weather, both as to temperature and moisture, previous to and immediately after the harvesting of most of the soybeans, was a cause of no little concern about their viability.
The Effect Of Oral And Intraperitoneal Administration Of Alcohol Upon The Concentration Of Alcohol In The Blood Of The Rat, V. B. Fish, V. E. Nelson
The Effect Of Oral And Intraperitoneal Administration Of Alcohol Upon The Concentration Of Alcohol In The Blood Of The Rat, V. B. Fish, V. E. Nelson
Proceedings of the Iowa Academy of Science
A number of experiments were made in this laboratory to determine the rate of absorption of alcohol into the blood of rats after the administration of alcohol both orally and by intraperitoneal injection. Both fasted and unfasted rats were used in these experiments.
Intoxcation Tests - A Third Year Report, T. U. Marron, R. W. Morrissey
Intoxcation Tests - A Third Year Report, T. U. Marron, R. W. Morrissey
Proceedings of the Iowa Academy of Science
Motorists arrested for intoxication during 1939 and 1940 were classified according to the blood analyses done in this laboratory (Marron, 1941). Examination of the results indicated that the average man apprehended for driving while in an intoxicated condition had a concentration of 226 mg. of alcohol per 100 cc. of blood. It was calculated that he drank 11 to 14 ounces of whiskey, 11 to 14 bottles of 3.2 % beer, or the equivalent. Ninety-two percent of those submitting to blood tests were intoxicated according to the standards of the National Safety Council. Seventy-two percent had consumed a minimum of …
Apparatus For Distilling Alcohol From Biological Fluids And A Calculator For Harger Titrations, T. U. Marron, C. S. Banwarth
Apparatus For Distilling Alcohol From Biological Fluids And A Calculator For Harger Titrations, T. U. Marron, C. S. Banwarth
Proceedings of the Iowa Academy of Science
For the determination of alcohol in body fluids the Harger (1935) titration is extensively used with distillates obtained in various ways; e.g., by steam distillation, desiccation, distillation from picric acid, picrate-tartrate or tungstic acid. Gibson (1939) has combined it with the simple distillation from picric acid solution (Nicloux, et al. 1934) to produce an essentially satisfactory and rapid determination. Clinical simplicity with research accuracy has been achieved by the use of a specially designed distillation apparatus with the method (Johnston and Gibson, 1940). After using this method for a long period the authors have been able to revise it for …
Absorption Spectra Of Ketimines With Reference To Ketimine-Enamine Tautomerism, J. B. Culbertson
Absorption Spectra Of Ketimines With Reference To Ketimine-Enamine Tautomerism, J. B. Culbertson
Proceedings of the Iowa Academy of Science
The first reported preparation (Roesch, 1915, 1917) of diphenyl ketimine salts in which hydroxy groups were 2- and 4- positions indicated that these compounds were unusually stable toward hydrolysis to the corresponding ketones and ammonium chloride. Subsequent studies (Culbertson, 1927, 1931) have suggested that the resistance of these phenolic ketimine salts toward hydrolysis was due to a ketimine-enamine tautomerism, or resonance, resulting in masking the ordinary reactivity of the imine (> N-H) group toward reaction with water.
Structure Of The High-Melting Dibromoveratric Acid, Don E. Floyd, L. Chas. Raiford
Structure Of The High-Melting Dibromoveratric Acid, Don E. Floyd, L. Chas. Raiford
Proceedings of the Iowa Academy of Science
In the current edition of Beilstein's (1927) work the position of the halogen atoms in Boyen's (1888) dibromoveratric acid which he found to melt at 182°, are recorded as 2 and 5. Boyen merely determined the composition of his acid and did not even suggest a structure for it. The positions assigned for bromine seem to rest entirely on the statement of Zincke and Halm (1903) who assumed these positions in related compounds studied by them, though they offered no definite proof. They refer for support to the work of Auwers and Müller (1902) in the same field, but the …
The Isolation Of New Antioxidants From Vegetable Fats, Calvin Golumbic
The Isolation Of New Antioxidants From Vegetable Fats, Calvin Golumbic
Proceedings of the Iowa Academy of Science
Many vegetable oils owe their resistance to oxidative deterioration to the presence of natural inhibitors (inhibitols) such as the tocopherols. Equally important antioxygenic factors are the chroman-5, 6-quinones, the reduced forms of which have now been isolated from hydrogenated vegetable fat substrates by chromatographic adsorption on activated alumina. The adsorbed zone contained colorless antioxygenic substances, other than tocopherols, which lost their activity after acetylation but not after oxidation with ferric or gold chlorides. Concentrates obtained from the oxidized fractions, showed the qualitative chemical and spectral absorptive properties of the chroman-5, 6-quinones. The source of these highly colored o-quinones is thus …
Preparation And Stability Of Diphenyl Amine Hydronitrate, Robert E. Jones, J. B. Culbertson
Preparation And Stability Of Diphenyl Amine Hydronitrate, Robert E. Jones, J. B. Culbertson
Proceedings of the Iowa Academy of Science
In connection with certain proposed studies the question of the preparation of diphenyl amine hydronitrate, or diphenyl ammonium nitrate, arose. A search of the literature revealed no record of this substance. The nearest equivalent reported was the perchlorate salt of diphenyl amine (Ber. 43, 1085-86. 1910). This compound was obtained upon treatment of a carbon tetrachloride solution of the amine with 70% perchloric acid added dropwise.
Stability Of Cysteine Solutions, Ronald E. Pyle, Joseph I. Routh
Stability Of Cysteine Solutions, Ronald E. Pyle, Joseph I. Routh
Proceedings of the Iowa Academy of Science
The stability of cysteine in acid solution increased with increase in acidity (0.1 to 6N HC 1). When the solutions were made in conductivity water and stored under nitrogen, less than 1 per cent of the cysteine was oxidixed in 7 days.
Intermediary Metabolism Of Histidine, Robert Crookshank, Clarence P. Berg
Intermediary Metabolism Of Histidine, Robert Crookshank, Clarence P. Berg
Proceedings of the Iowa Academy of Science
The two optical isomers of β-4-imidazolelactic acid were prepared from the d-and l- histidine monohydrochlorides by means of silver nitrite. These were fed in diets containing casein hydrolysates from which the histidine had been removed by precipitation as the silver salt (Hydrolysate A) or as the mercuric sulfate complex (Hydrolysate B).
Raman Effect Of Sodium Cyanide, Geo. Glockler, H. T. Baker
Raman Effect Of Sodium Cyanide, Geo. Glockler, H. T. Baker
Proceedings of the Iowa Academy of Science
In another study we wished to use the Raman line of sodium cyanide solution as a reference spectrum. We find that potassium cyanide solutions but not sodium cyanide have been studied by Pal and Sen Gupta (1930). It is well known that electrolytes which are strong salts and hence highly ionized in solution give Raman lines only of their ions in case the latter are complex. Hence only the Raman spectrum of the cyanide ion is to he expected from any cyanide solution independent of the positive ion.
Representation Of Equilibrium Conditions For The Carbon Monoxide - Carbon Dioxide - Steel System, H. A. Wilhelm, C. F. Gray
Representation Of Equilibrium Conditions For The Carbon Monoxide - Carbon Dioxide - Steel System, H. A. Wilhelm, C. F. Gray
Proceedings of the Iowa Academy of Science
Proper conditioning of atmospheres for carburizing, for heat treating, and for carrying out other high temperature metallurgical processes depends in general on control of each system with regard to its equilibrium conditions. In connection with steel processing, numerous investigations have been made to determine equilibrium conditions for the most common gas-steel reactions. One such reaction that has been studied extensively takes place when certain mixtures of carbon monoxide and carbon dioxide come in contact with ordinary carbon steel at elevated temperatures. The purpose of this paper is to review some of the methods that have been used to represent equilibrium …
The Diffusions Coefficient Of Hemoglobin In Pure Water Solution, F. E. Kite, Donald A. King, W. G. Eversole
The Diffusions Coefficient Of Hemoglobin In Pure Water Solution, F. E. Kite, Donald A. King, W. G. Eversole
Proceedings of the Iowa Academy of Science
Carbon monoxide hemoglobin prepared from beef blood by the method of Marshall and Welker (J. Am. Chem. Soc., 35, 820. 1913) was allowed to diffuse from a water solution of constant concentration into pure pater contained in a thin flat cell of optical glass.
Dissociation Pressure Of Some Potassium Polyhalides, Jacob Cornog, Eldon Bauer
Dissociation Pressure Of Some Potassium Polyhalides, Jacob Cornog, Eldon Bauer
Proceedings of the Iowa Academy of Science
Potassium dichloro iodide (KLCL2 or KCL-ICL, m. p. 195°) and potassium trichloro di-iodide (KCL.21CL, m. p. 45°) have been prepared and their dissociation pressures measured.
Did Beavers Impound Waters For Ames Peat Bog?, Charles S. Gwynne
Did Beavers Impound Waters For Ames Peat Bog?, Charles S. Gwynne
Proceedings of the Iowa Academy of Science
A deposit of peat located in a valley about a mile northeast of Ames, has been known for many years. It is rather unusual in that it lies along a small mature valley rather than in a swale of the upland. Investigation is believed to show that the deposit developed as the result of impounding of water by beaver dams.
The Laminated Pleistocene Sediments Of The Cedar Rapids Region, L. R. Wilson, C. G. Kos
The Laminated Pleistocene Sediments Of The Cedar Rapids Region, L. R. Wilson, C. G. Kos
Proceedings of the Iowa Academy of Science
In the vicinity of Cedar Rapids there are extensive deposits of laminated sands within, and adjacent to the valley of the Cedar River and its tributaries. These lie above the till of the Iowan Substage and are associated for the most part with the highest terrace found along the Cedar River and its tributaries in Linn County. The presence of the laminated sediments has been noted by others, but no detailed study appears to have been made of them in the region of Cedar Rapids. During the active building program in Cedar Rapids many exposures were made in basement excavations …
The Reciprocal Bending - Torsion Effect For Lead Single Crystals, Stanley Bruntjin
The Reciprocal Bending - Torsion Effect For Lead Single Crystals, Stanley Bruntjin
Proceedings of the Iowa Academy of Science
A single crystal rod subjected to a pure axial torque also bends. Direct measurements on this effect have been made for lead single crystals.
Adiabatic Compressibilities Of Some Aqueous Solutions And Their Variation With The Indicated Liquid Structure Of The Water, Victor B. Corey
Adiabatic Compressibilities Of Some Aqueous Solutions And Their Variation With The Indicated Liquid Structure Of The Water, Victor B. Corey
Proceedings of the Iowa Academy of Science
Adiabatic compressibilities of aqueous solutions of twenty-seven strong electrolytes were determined by measuring the velocities of a supersonic wave of approximately 106 cycles. When the values of the partial molal volumes of the solute, water, were computed, there was found a striking correlation of these values with the adiabatic compressibilities. An exact correlation cannot be expected both because of the empirical nature of the formulas used and also because there is no reason to suppose that the altered structure of the water is of the same kind in every electrolyte. The results, however, are strongly indicative of the view …
Adiabatic Compressibility Of Electrolytic Solutions And The X-Ray Diffraction Intensity Distributions, V. B. Corey, G. W. Stewart
Adiabatic Compressibility Of Electrolytic Solutions And The X-Ray Diffraction Intensity Distributions, V. B. Corey, G. W. Stewart
Proceedings of the Iowa Academy of Science
A study of the adiabatic compressibility and the X-ray diffraction intensity distributions of twenty-six strong electrolytes shows a correlation to the following extent. If one compares the rate of change of adiabatic compressibility per mole with the rate of change of the minor X-ray diffraction peak per mole in two thirds of the twenty-six samples these values increase in magnitude together. If one plots the values of the former, changing from one to eight times, and of the latter varying sixty times, the points are included within an angle of about 35° (with one exception). This approximate correspondence adds credence …
A Simplified Conductivity-Radiation Experiment For The Elementary Laboratory, Lester T. Earls
A Simplified Conductivity-Radiation Experiment For The Elementary Laboratory, Lester T. Earls
Proceedings of the Iowa Academy of Science
In an attempt to fill a need for the laboratory approach to the physical processes of conduction and radiation of heat, the following two-part experiment is suggested.
The Rating Of Physics Teachers In The Pennsylvania Summer Engineering Defense Training Program, C. J. Lapp
The Rating Of Physics Teachers In The Pennsylvania Summer Engineering Defense Training Program, C. J. Lapp
Proceedings of the Iowa Academy of Science
Each physics teacher was given a subjective rating by a traveling physics supervisor after the teacher had been visited at least three times. After the teacher had been visited five times the physics supervisor rated the teacher objectively on a rating blank containing twelve items on a five point scale. Finally each teacher was rated on the basis of the achievement of his students as compared to the average achievement of all students in the program of equal ability after corrections had been made for aid received by those students in the research group.
Some Effects Associated With Negative Corona Onset, L. E. Pinney
Some Effects Associated With Negative Corona Onset, L. E. Pinney
Proceedings of the Iowa Academy of Science
Using concentric cylinder electrodes, observations were made on negative corona in hydrogen, argon, and nitrogen at pressures between 1 and 10 cm. of mercury. Positive ions produced by X-rays passing through argon in the corona chamber produced no measurable secondary effects at potentials below onset. Currents maintained by photo emission from the cathode became unstable at a potential near but definitely below onset.