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A Preliminary Survey Of Some Midwestern Plants For Substances Inhibiting Human Plasma Cholinesterase In Vitro, Wallace H. Orgell, Kunda A. Vaidya, Eugene W. Hamilton
A Preliminary Survey Of Some Midwestern Plants For Substances Inhibiting Human Plasma Cholinesterase In Vitro, Wallace H. Orgell, Kunda A. Vaidya, Eugene W. Hamilton
Proceedings of the Iowa Academy of Science
Substances which inhibit the action of human plasma cholinesterase in vitro have been found in aqueous extracts of various members of the plant family Solanaceae. A preliminary survey of some weedy and cultivated midwestern representatives of this family revealed eleven active species in six genera: Datura, Lycopersicon, Nicotiana, Petunia, Physalis, and Solanum. A member each of the genera Capsicum and Lycium were inactive. Inhibitory substances were not found in thirty-one species representing nineteen plant families other than Solanaceae.
Chemical Source Of Oxygen, John F. O'Brien
Chemical Source Of Oxygen, John F. O'Brien
Proceedings of the Iowa Academy of Science
An investigation was made on the thermal decomposition of the alkali metal chlorates and perchlorates of sodium, potassium and lithium, and mixtures of these. The effects of various catalysts in promoting and controlling the decomposition with the production of minimum reaction temperature and maximum oxygen yield were studied. Experimental results are presented for potassium chlorate and perchlorate.
The Varied Character Of The Des Moines River Valley In Central Iowa, Gene R. Dekoster, Keith M. Hussey, Robert D. Munson
The Varied Character Of The Des Moines River Valley In Central Iowa, Gene R. Dekoster, Keith M. Hussey, Robert D. Munson
Proceedings of the Iowa Academy of Science
The drainage system on the Des Moines River is quite varied between Humboldt and Des Moines. The variation in drainage characters is highlighted on a map prepared from aerial photographs and topographic sheets. The northern part of this area is associated with the Mankato drift sheet and is characterized by poorly developed, non-integrated drainage. The central part of the drainage system in Boone County flows across the Cary ground moraine. In this area the tributaries are short, intermittent, and deep, and appear as gullies and washes. Just south of Des Moines, the drainage makes another sharp change, and in this …
A Comparison Of "High Causally" And "Low Causally" Oriented Sixth Grade Children On Personality Variables Indicative Of Mental Health, Rolf E. Muuss
A Comparison Of "High Causally" And "Low Causally" Oriented Sixth Grade Children On Personality Variables Indicative Of Mental Health, Rolf E. Muuss
Proceedings of the Iowa Academy of Science
Two tests served as selection criteria for "high" and "low" causally oriented groups, the Social Causal Test and the Physical Causal Test. They were administered to 280 sixth graders. The "Highs" (N 90) were defined as those above the group mean on both tests, "Lows" (N 73) as those falling below both means. The 12 item Intolerance of Ambiguity Scale and the 24 item Children's Antidemocratic Attitude Scale were administered to all subjects. The "Highs" showed significantly less antidemocratic attitude and less intolerance of ambiguity than the "Lows". The differences remained significant if subjects were matched on IQ scores.
Studies On The Effects Of Maintenance Of Hamster Adrenals In Vitro, Philip A. Kendall, Mona R. Miltzer, George R. Zimmerman
Studies On The Effects Of Maintenance Of Hamster Adrenals In Vitro, Philip A. Kendall, Mona R. Miltzer, George R. Zimmerman
Proceedings of the Iowa Academy of Science
Whole adrenals of the young adult hamster were maintained in culture. In most of the experiments the organ was supported on lens paper, but, latterly, cellulose and gelatin sponge were used. The culture media employed were (1) Ringer's Solution (no nutrient), and (2) a nutrient mixture consisting of modified Krebs-Ringer's Solution, lactalbumen hydrolysate, yeast extract and horse serum. The maintenance period was up to seven days, and the culture medium was freshened regularly in certain cases. Organs were weighed at the beginning and end, and sometimes during maintenance. Histological appearance at termination was compared with that of a freshly extirpated …
Experimental Studies On The Effects Of Certain Environmental Factors On Fecundity And Longevity Of The Rotifer, Francis A. Pray
Experimental Studies On The Effects Of Certain Environmental Factors On Fecundity And Longevity Of The Rotifer, Francis A. Pray
Proceedings of the Iowa Academy of Science
Philodina megalotrocha were grown in isolation culture in Knop's solution or variations thereof, buffered at pH 8.4, at a constant temperature of 30° C. Temperature toleration ranged from 5° C. to 35°C. Upper and lower limits of pH tolerance were pH 10.2 and pH 4.0. Longevity in low salt concentrations (0.02 percent) was increased over that of high concentrations; egg production was not altered except at high concentrations (0.06 percent), at which point it was very low. The effects were tested, one at a time, of high and low concentrations of calcium, magnesium, and potassium. In low calcium solutions longevity …
Morphology Of The Reproductive System Of Tetrix Arenosa Angusta (Hancock) (Orthoptera, Tetrigidae), Richard E. Widdows, James R. Wick
Morphology Of The Reproductive System Of Tetrix Arenosa Angusta (Hancock) (Orthoptera, Tetrigidae), Richard E. Widdows, James R. Wick
Proceedings of the Iowa Academy of Science
The internal reproductive organs of the male include a pair of testes, each composed of about 37 follicles and connected to a short vas efferens; a pair of vasa deferentia; about 12 paired accessory glands; a twice folded ejaculatory duct and a membranous, extensible intromittent organ. The external structures of the male include a chitinous collar, pallial complex and ninth abdominal sternum. The internal reproductive organs of the female include a pair of ovaries, each composed of 11 ovarioles; paired lateral oviducts; a short median oviduct; a terminal genital chamber; a trilobed spermatheca attached to a spermathecal gland, and a …
Modification By Light Of 24-Hour Activity Of White Rats, G. Edgar Folk Jr.
Modification By Light Of 24-Hour Activity Of White Rats, G. Edgar Folk Jr.
Proceedings of the Iowa Academy of Science
The 24-hour rhythm of running activity of white rats originates from a light-cycle and can be reversed by illuminating at night rather than by day. If continuous light is used, the activity phase of the rhythm remains 8-12 hours in length but shows a regular, constant and definite amount of alteration or delay in the time of starting so that the activity block travels around the clock. Behavior modification such as this should be called a photoperiodic response. In the present studies the photoperiodic data were: (1) the delay in time of starting activity for rats in continuous light was …
Penned Game Birds In Dieldrin Treated Fields, M. E. Stempel
Penned Game Birds In Dieldrin Treated Fields, M. E. Stempel
Proceedings of the Iowa Academy of Science
Granular dieldrin was applied by air to control Japanese beetles. Fourteen pheasants and 12 quail in four pens were exposed to the application. Nearby were wild quail, songbirds and starlings, but no pheasants. Later, remains of some wild birds were seen or reported. Nine quail and one starling "posted" at Ames had lesions similar to those in birds affected by toxemia. One quail that died before the operation and two pheasants that were examined did not show these lesions.
Dissociation Of Carbon Dioxide, Mary Pat Dorgan
Dissociation Of Carbon Dioxide, Mary Pat Dorgan
Proceedings of the Iowa Academy of Science
An investigation of possible methods of dissociation of respiratory carbon dioxide to provide for recovery of oxygen indicates the most feasible methods to be a catalytic decomposition by chemisorption on reduced metals and photolysis of carbon dioxide by ultraviolet light. Reduction of carbon dioxide by iron, nickel, and cobalt gives 0 to 25 volumes per cent carbon monoxide at temperatures from 300 to 800° C.
A Modification Of The Carbowax Embedding Technique For Plant Tissue, Waldo S. Walker
A Modification Of The Carbowax Embedding Technique For Plant Tissue, Waldo S. Walker
Proceedings of the Iowa Academy of Science
The highly hydrate condition of the wall material of the cells of collenchyma causes considerable difficulty in the preparation of permanent sections of the material which are suitable for quantitative studies. When standard procedures of dehydration and embedding are employed, excessive shrinkage of the wall material is common. In an attempt to avoid this shrinkage, polyethylene glycol (carbowax) was used as the killing, fixing, dehydrating and embedding medium. This method met with considerable success. The schedule outlined is a modification of that used by A. R. Spurr.
The Separation Of Salicylate Metabolites By Paper Electrophoresis, Janice Franz, Dorothy Schottelius, Emilio Arredondo, W. D. Paul, J. I. Routh
The Separation Of Salicylate Metabolites By Paper Electrophoresis, Janice Franz, Dorothy Schottelius, Emilio Arredondo, W. D. Paul, J. I. Routh
Proceedings of the Iowa Academy of Science
The technique of paper electrophoresis was employed to develop a method for the separation of the end-products of salicylate metabolism. A phthalate buffer with a pH of 3.2 and an ionic strength of 0.0125 to 0.05 produced the most satisfactory separation of the metabolites. It was found that the end-products, i.e., salicylic, acetyl salicylic, salicyluric, and gentisic acids, could best be detected by the fluorescent spots they exhibited when the paper strips were viewed under ultraviolet light. The sensitivity of the method was such that as little as one microgram of salicylic acid could be detected as a fluorescent spot …
Resolving Discrepancies Between Surface And Subsurface Studies Of The Maquoketa Formation Of Northeast Iowa, Mary C. Parker, Fred H. Dorheim, Russell B. Campbell
Resolving Discrepancies Between Surface And Subsurface Studies Of The Maquoketa Formation Of Northeast Iowa, Mary C. Parker, Fred H. Dorheim, Russell B. Campbell
Proceedings of the Iowa Academy of Science
The Maquoketa formation in the outcrop area has been assigned a maximum thickness of 257 feet by earlier surface workers. Recent subsurface study in the same area reveals a thickness of 300-320 feet of Maquoketa sediments. Until now the correlation of subsurface units to recognized surface members has been hampered by this discrepancy. The recognition and identification of a new unit in the Elgin member of the Maquoketa formation, and a greater measured thickness of the Isotelus zone has resolved this difference.
A Wishing Well, Robert Frost
A Wishing Well, Robert Frost
James Hearst Documents
The poem A wishing well by Robert Frost, sent as a Christmas greeting in 1959.
English I: Introduction, W. B. Fagan, Olive Hambly
English I: Introduction, W. B. Fagan, Olive Hambly
Midwest: A Literary Review
No abstract provided.
Effect Of Seed Size And Hulls Upon X-Ray Sensitivity Of Oat Seeds, C. L. Gonzalez, K. J. Frey
Effect Of Seed Size And Hulls Upon X-Ray Sensitivity Of Oat Seeds, C. L. Gonzalez, K. J. Frey
Proceedings of the Iowa Academy of Science
Apparently the hull covering on oat seeds afforded some protection to the seed from X-rays, although the degree of protection varied among varieties. At X-ray dosages of 30,000r to 40,000r the large seeds were damaged more than the small ones when measured by germination percentage or reduction in seedling vigor. The damage from X-rays was not completely related to the germ sizes of the 2 seed classes.
New County Records For Marsh And Aquatic Tracheophytes In Iowa, Tom S. Cooperrider
New County Records For Marsh And Aquatic Tracheophytes In Iowa, Tom S. Cooperrider
Proceedings of the Iowa Academy of Science
A list is presented of the 147 species of marsh and aquatic tracheophytes known from Clinton, Jackson and Jones counties, Iowa. Annotations indicate the 213 new county records found among the writer's recent collections.
Petrography And Engineering Properties Of Kansan Till In Southern Iowa, A. R. Dahl, D.T. Davidson, C. J. Roy
Petrography And Engineering Properties Of Kansan Till In Southern Iowa, A. R. Dahl, D.T. Davidson, C. J. Roy
Proceedings of the Iowa Academy of Science
Kansan till outcrops over approximately 25 percent of the surface area in southern Iowa. Most natural outcrops occur along the flanks of loess-capped hills. The texture of the till may be roughly divided into thirds each of clay, silt, and sand and gravel. Quartz and feldspar are the dominant minerals along with montmorillonite and illite-group clay minerals. The majority of the calcareous till classifies as an A-6 engineering material.
Simplified Radioactive Fallout Detector, Janet S. Paul
Simplified Radioactive Fallout Detector, Janet S. Paul
Proceedings of the Iowa Academy of Science
A method for the detection and measurement of radioactive fallout through the use of film badges is described. Differences in exposure are determined by measuring transmitted light through the processed film. This has the advantage of being simple, uncomplicated, and not requiring specially trained technicians.
A Multiple Point Recorder For Small Animal Locomotor Activity, Harold W. Shipton, John W. Emde, G. Edgar Folk Jr.
A Multiple Point Recorder For Small Animal Locomotor Activity, Harold W. Shipton, John W. Emde, G. Edgar Folk Jr.
Proceedings of the Iowa Academy of Science
This recorder is intended to simplify the assessment of data gathered from photoelectric actometers registering total locomotor movements. The information is presented automatically in two forms: (1) a curve of total activity over a 24 hour period, (2) a bar graph of the activity in each 30 minute time interval. A further trace is used to enable the time of onset of bursts of activity to be judged with reasonable accuracy. A particular advantage lies in the fact that the recording pens are stationary, making it possible to plot the outputs from several activity counters across the whole width of …
Abscission Zone Anatomy, Development, And Separation In Nicotiana Tabacum, Robert E. Yager
Abscission Zone Anatomy, Development, And Separation In Nicotiana Tabacum, Robert E. Yager
Proceedings of the Iowa Academy of Science
Anatomical differences between Lizard's Tail and Little Turkish varieties of Nicotiana tabacum which exist during development of the separation zone and as floral abscission occurs are described. Cells are larger in Little Turkish by an average of 5 to 6 microns in the abscission zone and by 10 microns in the developing fruit. The separation layer in Little Turkish is located 5 to 7 tiers of cells distal to the groove and is usually composed of only 4 to 6 tiers. In Lizard's Tail the separation layer is 8 to 12 tiers distal to the groove, and as many as …
Morphology And Cytology Of Some Hybrids Between Elymus Canadensis And E. Virginicus, Richard W. Pohl
Morphology And Cytology Of Some Hybrids Between Elymus Canadensis And E. Virginicus, Richard W. Pohl
Proceedings of the Iowa Academy of Science
Substances which inhibit the action of human plasma cholinesterase in vitro have been found in aqueous extracts of various members of the plant family Solanaceae. A preliminary survey of some weedy and cultivated midwestern representatives of this family revealed eleven active species in six genera: Datura, Lycopersicon, Nicotiana, Petunia, Physalis, and Solanum. A member each of the genera Capsicum and Lycium were inactive. Inhibitory substances were not found in thirty-one species representing nineteen plant families other than Solanaceae.
Studies Of Complexes Of The Transition Metals. Ii. Cobalt Complex With Dithioloxalate, Ralph E. Christoffersen, William A. Deskin
Studies Of Complexes Of The Transition Metals. Ii. Cobalt Complex With Dithioloxalate, Ralph E. Christoffersen, William A. Deskin
Proceedings of the Iowa Academy of Science
The cobalt (II) ion and dithioloxalate ion form a complex which is stable in a water solution and highly colored. The complex was studied by means of spectrophotometric methods in the visible region. By using the method of continuous variation of Job and the method of varying mole ratio, the composition of the complex was found to be that of three moles of ligand to one mole of cobalt. The overall formation constant of the complex was determined by the method of varying mole ratio and by successive dilutions of stoichiometric proportions of ligand and metal. The ionic strength of …
Autoclave Method For Determining Susceptibility Of Carbonate Aggregates To Silicification, John Lemish, Ramon E. Bisque
Autoclave Method For Determining Susceptibility Of Carbonate Aggregates To Silicification, John Lemish, Ramon E. Bisque
Proceedings of the Iowa Academy of Science
Autoclave treatment of concrete bars made from argillaceous dolomitic carbonate aggregates at a temperature of 420 ° ± 3 ° F. and a steam pressure of 295 ± 10 lbs. for 3 to 9 hours caused the progressive development of silicified reaction shells on the coarse carbonate aggregate similar to those found in distressed concrete. Similar treatment of concrete bars made from pure limestone aggregates induced no reaction shell growth. The susceptibility of carbonate aggregates to silicification could be rapidly determined by the autoclave method.
Extent Of The Muscatine Series In Muscatine County, Iowa, Pierce Ryan, S. M. Smith, F. F. Riecken
Extent Of The Muscatine Series In Muscatine County, Iowa, Pierce Ryan, S. M. Smith, F. F. Riecken
Proceedings of the Iowa Academy of Science
The morphology of the profiles of 35 randomly selected sites in Muscatine County, Iowa, was studied. None of these sites qualified as type locations for the Muscatine series, based on current concepts and definitions of this series. Originally established in Muscatine County in 1916, 38.2 per cent of the soils of the county were classified in this series. Now, Muscatine County seems to be no longer a suitable type location for the Muscatine series.
Large Erratics In Jasper County, Iowa, Sherwood D. Tuttle
Large Erratics In Jasper County, Iowa, Sherwood D. Tuttle
Proceedings of the Iowa Academy of Science
Large granite erratics, formerly attributed to the Iowan, are believed to be associated with the Kansan drift. Now located within valleys, they have remained after considerable Kansan till has been eroded.
Waring's Problem, Modulo P, And The Representation Symbol, M. Anne Cathleen Real
Waring's Problem, Modulo P, And The Representation Symbol, M. Anne Cathleen Real
Proceedings of the Iowa Academy of Science
The representation symbol [a,b,c] is the statement that an integer of n-ic type a is congruent to the sum of an integer of n-ic type b and an integer of n-ic type c. The symbol is extended to include any definite number of elements. New properties, together with a list of symbols involving the n-ic types of specific integers, are derived for use in studying Waring's problem, modulo p, for a particular exponent n. Let Tρ (n) be the least number such that every integer is congruent to the sum of Tρ (n) or fewer …
Analytic Tendency As A Factor In The Performance Of Women On The Iowa Pursuitmeter, David A. Hills
Analytic Tendency As A Factor In The Performance Of Women On The Iowa Pursuitmeter, David A. Hills
Proceedings of the Iowa Academy of Science
Women subjects were dichotomized into analyzers and non-analyzers on the basis of their verbal statements regarding their approach in solving Kohs-type block design problems. Groups of analyzers and non-analyzers then learned to perform the standard task on the Iowa Pursuitmeter, and were found to differ only slightly in the amount of skill acquired over 24 trials. These results are in contrast to those of Miles for male analyzers who were found to perform at significantly higher levels of proficiency than non-analyzers. A sex difference apparently attributable to the extreme difficulty of the task for women is discussed.
Formica Fossaceps Buren And Formica Obscuriventris Clivia Creighton As Slaves Of Formica Rubicunda Emery, R. L. King, R. M. Sallee
Formica Fossaceps Buren And Formica Obscuriventris Clivia Creighton As Slaves Of Formica Rubicunda Emery, R. L. King, R. M. Sallee
Proceedings of the Iowa Academy of Science
Observations on mixed colonies have shown that Formica fossaceps and Formica obscuriventris clivia both live as slaves for Formica rubicunda together with Formica cinerea montana and Formica fusca. Formica obscuriventris clivia may start its colonies as a temporary social parasite of fusca.