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Articles 32491 - 32520 of 33262
Full-Text Articles in Entire DC Network
3rd Annual Rocky Mountain Spectroscopy Conference Abstracts Of Papers
3rd Annual Rocky Mountain Spectroscopy Conference Abstracts Of Papers
Rocky Mountain Conference on Magnetic Resonance
Abstracts of papers presented at the 3rd annual meeting of the Rocky Mountain Spectroscopy Conference, sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy. Held in Denver, Colorado, August 8-9, 1960.
Determination Of Leadchlorofluoride With Sodium Formate Buffer, Bernadine K. Kasiewicz
Determination Of Leadchlorofluoride With Sodium Formate Buffer, Bernadine K. Kasiewicz
Bachelors’ Theses
The method used for the leadchlorofluoride is a gravimetric method which is attempted to be improved by sutiable buffer to lower the pH to 2 - 2.5.
In this experiment, I am attempting to show that sodium formate may be a possible buffer for use with leadchlorofluoride.
An Investigation Of Solvent Extraction Techniques In The Determination Of Formation Constants Of Complex Species In Aqueous Silver Chloride Solution, David Martin Bodily
An Investigation Of Solvent Extraction Techniques In The Determination Of Formation Constants Of Complex Species In Aqueous Silver Chloride Solution, David Martin Bodily
Theses and Dissertations
Solvent extraction techniques have been used to determine formation constants for molecular silver chloride and dichloro silver (I) ion in unsaturated aqueous solutions. Nitrobenzene was used to extract the molecular silver chloride from the aqueous silver chloride solution. The total concentration of silver in each phase was determined by radioassay techniques and related by an expression involving the equilibrium constants. The reciprocal of the distribution ratio times the activity of the chloride ion was plotted versus the activity of the chloride ion and portions of the curve were analyzed by the method of least squares to obtain values for the …
A Study Of The Curcumin Method For Boron Determination, James Edward Hardcastle
A Study Of The Curcumin Method For Boron Determination, James Edward Hardcastle
Master's Theses
The purpose of the research project, of which this thesis is a partial report, was two fold: first, to develop a method for determining small quantities of boron, and second, to develop a rapid field test for the determination of atmospheric boron. A literature survey revealed that the curcumin method is the most sensitive colorimetric method presently available for boron determination. Also, the curcumin paper test should be readily adapted to the determination of atmospheric boron.
The Dilute Solution Chemistry Of Antimony, Kent H. Jones
The Dilute Solution Chemistry Of Antimony, Kent H. Jones
Chemistry and Chemical Biology ETDs
Investigation of the chemistry of the elements by conventional methods is generally limited to concentrations on the order of 10-5 M or higher. The discovery of radio-activity opened new fields in chemistry among which is the obtaining of information concerning chemical behavior of elements at very low concentrations. For many years after the initial discovery of radioactivity in 1896 by Becquerel, the study of low-concentration chemistry was limited to about ten naturally occurring radioactive elements. A renewed interest in this field was generated after 1934 when it was discovered by Curie and Joliot that radioactive elements could be artificially …
Preparation And Infrared Spectrum Of Dimethyl Pinate In An Attempt To Determine The Configuration Of Pinic Acid, Margaret Schormuller
Preparation And Infrared Spectrum Of Dimethyl Pinate In An Attempt To Determine The Configuration Of Pinic Acid, Margaret Schormuller
Bachelors’ Theses
The esters if pinic acid are in increasing demand for low temperature lubricants, and certain esters are also useful as plasticizers. In spite of the vast amount of work that has been done with pinic acid and its esters, its geometrical configuration has not yet been satisfactorily established. Stereoisomers may result from both geometrical and optical isomerism. If the cis configuration is assumed to be the dd-enantiomorph, a total of four enantiomorphs are possible.
A Study Of The Variables Affecting The Addition Of Nitrosyl Chloride To Alpha Methyl Styrene, Mary Jane Buchek
A Study Of The Variables Affecting The Addition Of Nitrosyl Chloride To Alpha Methyl Styrene, Mary Jane Buchek
Bachelors’ Theses
While working with two compounds, one of which was an olefin, and the other which was Nitrosyl Chloride, Dr. N. Hoffman noticed that although a normal reaction appeared to be taking place, two relatively unusual products were obtained.
As the problem was suggested to me at this point, a literature search was started, first of all, to find out the specific mechanism governing the addition of Nitrosyl Chloride to olefins; secondly, to find out if anyone who had done any type of work at all with Nitrosyl Chloride had obtained the same unusual results as were obtained here; and finally, …
An Investigation Of The Formation Constant Of Molecular Silver Chloride Using Ion Exchange Techniques.|Nii.|Pan Investigation Of The Rate Of Precipitation Of Silver Sulfide By Thioacetamide, James W. Pyper
Theses and Dissertations
The first part of this work reports on the investigation of the formation constant of molecular silver chloride using ion exchange techniques. In order to determine the formation constant, it was necessary to develop a method of rinsing the sorbed molecular silver chloride from the resin. It was found that desorption with nitrobenzene would remove the sorbed molecular species. However, the formation constant was not calculated since the nitrobenzene used contained hydrogen ion and chloride ion which removed silver ion as well as the molecular species. In the study of the formation of silver sulfide by the reaction between the …
Interaction Of Riboflavin With Molybdenum, Jacques Tocatlian
Interaction Of Riboflavin With Molybdenum, Jacques Tocatlian
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Molybdenum may function as a catalyst in promoting and controlling some of the complex chemical reactions that go on in living systems. The lack of understanding which exists about these reactions is due to their obvious complexity and to the extremely minute quantities of molybdenum involved. Traces of molybdenum have been shown to have spectacular results on the growth of plants when added to certain soils. This metal is also required for the growth of azobacter, the nitrogen-fixing bacteria (1).
Molybdenum has been shown to be present in four enzymes: nitrate reductase (2), hydrogenase (3), xanthine oxidase (4) and aldehyde …
A Study Of The Kinetics Of The Oxidation Of Uranium(Iv) By Cerium(Iv), Floyd Beatty Baker
A Study Of The Kinetics Of The Oxidation Of Uranium(Iv) By Cerium(Iv), Floyd Beatty Baker
Chemistry and Chemical Biology ETDs
The kinetics of a number of oxidation-reduction reactions and exchange reactions involving cations of the transition and inner transition elements have been extensively reviewed by T. W. Newton and S. W. Rabideau. These workers represent the formation of the activated complex by an equation which includes only the principal species in solution as reactants.
Some Results With Nitrogen Fertiliser On Cereals At Esperance Plain Research Station, William John Toms
Some Results With Nitrogen Fertiliser On Cereals At Esperance Plain Research Station, William John Toms
Journal of the Department of Agriculture, Western Australia, Series 4
ON newly-cleared land at Esperance Plain Research Station the use of sulphate of ammonia on cereals has proved profitable over a number of seasons.
The response to sulphate of ammonia varies markedly with the season.
Feeding Pickled Wheat To Pigs, Department Of Agriculture, Western Australia
Feeding Pickled Wheat To Pigs, Department Of Agriculture, Western Australia
Journal of the Department of Agriculture, Western Australia, Series 4
INQUIRIES are frequently received from farmers asking whether it is safe to feed pickled wheat to pigs, and if so, the quantities which would be suggested.
Until very recently there was no experimental information on the safety or possible dangers of these wheat pickling agents, but feeding trials completed last year at the Animal Health and Nutrition Laboratory, Nedlands, have provided some of the answers to these questions.
3-Amino-2,5-Dihydroxy-5-Sulfo-Benzoic Acid, Hideo Tomomatsu
3-Amino-2,5-Dihydroxy-5-Sulfo-Benzoic Acid, Hideo Tomomatsu
University of the Pacific Theses and Dissertations
It seems possible that efforts to discover essential chemical differences which might exist between normal and malignant cells will eventually reveal the secret of cancer and thereby lead to new approaches to safer and more selective chemotherapy.
One objective of this study is to find that part of this molecule that causes it to concentrate in the tumor and thence make a smaller size compound which has similar concentration characteristics to tumor as tetracycline. For this purpose, an attempt was made in this study to synthesize the right side ring of Chlorotetracycline, the structure of which is shown below. [see …
Weed Research. 7. Weed Control Around The Yard, Geoffrey A. Pearce
Weed Research. 7. Weed Control Around The Yard, Geoffrey A. Pearce
Journal of the Department of Agriculture, Western Australia, Series 4
MANY farmers and city householders have weed problems around houses and sheds which can be readily overcome by treatment with appropriate herbicides.
The risk from fire through weeds and unslightly growth can easily be removed and an area free of any plant growth can be maintained with little effort for a considerable period.
List Of Registered Fertilisers : 1959-60, H G. Cariss
List Of Registered Fertilisers : 1959-60, H G. Cariss
Journal of the Department of Agriculture, Western Australia, Series 4
TN accordance with the provisions of the Fertilisers Act, 1928-1955, it is required that—with the exception of bulk sales to a manufacturer and those made in accordance with a buyer's written prescription—all fertilisers sold are required to be registered annually, the registration year being from November 1 to October 31 following.
The list of fertilisers registered for the year commencing November 1, 1959, is set out herewith in tabular form.
The Chelation Of Cu(Ii) With 1, 3-Bis(Tris(Hydroxymethyl)Methylamino)-2-Propanol And 1, 3-Bis (2-Hydroxyethylamino)-2-Propanol, David Andrew Jackson Jr.
The Chelation Of Cu(Ii) With 1, 3-Bis(Tris(Hydroxymethyl)Methylamino)-2-Propanol And 1, 3-Bis (2-Hydroxyethylamino)-2-Propanol, David Andrew Jackson Jr.
Master's Theses
The chelating agent 1, 3-bis(2-hydroxyethylamino)-2-propanol dihydrochloride was prepared and preliminary examinations of the Cu(ll) and Fe(lll) complexes were carried out spectrophotometrically. This dihydrochloride as well as 1, 3 bis(tris(hydroxymethyl)methylamino)-2-propanol dihydrochloride. were converted from the chloride salts to their corresponding ammonium bases. The conversion was carried out by passing an aqueous solution of each chloride salt through an ion exchange column containing Amberlite XE-78 resin.
Solutions of these bases were standardized for use in potentiometric titration&. Each ammonium base was titrated with standard perchloric acid at 20°C, 30°C, and 40°C. The dissociation constants. were calculated using these data. Aqueous solutions of …
A Chromatographic Study Of The Polyphenols In Cured Tobacco, Marvin Dennis Edmonds
A Chromatographic Study Of The Polyphenols In Cured Tobacco, Marvin Dennis Edmonds
Master's Theses
The object of this project was to isolate, separate, and identify the polyphenols in tobacco. Following this, the aim was to develop a method for the quantitative determination of the major polyphenols in tobacco.
Existing methods for the determination of polyphenols in tobacco involve lengthy procedures which are concerned with one or two of the polyphenols rather than the· complete class of compounds. The methods consist of exhaustive extraction procedures, lengthy chromatographic procedures and numerous methods of identification.
Extensive research on the determination of polyphenols by chromatography has been carried out in the field of tobacco and in other fields. …
The Development Of Nickel Electrodeposits On Copper Monocrystals As Studied With The Electron Microscope, Lucille Burnett Garmon
The Development Of Nickel Electrodeposits On Copper Monocrystals As Studied With The Electron Microscope, Lucille Burnett Garmon
Master's Theses
Important theoretical and experimental developments in the field of electrocrystallization on single crystals are briefly reviewed and new data presented. The deposition of nickel from a Watts-type bath onto electrolytically polished mono crystals of copper is the system chosen for study. Various aspects of the structural changes in the deposit with increasing thickness are considered. The electron microscope is the main tool employed and the deposit is studied by detaching it from the basis metal as well as by the use of surface replicas. Short backgrounds in crystallography and electron microscopy are included.
Preparation Of Elemental Boron And Measurement Of Its Emittance At Incandescent Temperatures, Claude P. Talley
Preparation Of Elemental Boron And Measurement Of Its Emittance At Incandescent Temperatures, Claude P. Talley
Master's Theses
The normal spectral emittance at 0. 65 microns of elemental boron specimens was measured at incandescent temperatures by the hollow-tube method, This was made possible by depositing boron onto thin-walled hollow tubes of graphite and molybdenum. An approximate value of the total hemispherical emittance for boron was also obtained. The deposition of boron was accomplished by chemical vapor plating with boron tribromide and hydrogen. The boron produced was characterized in several ways.
Gravimetric Determination Of Barium By Homogeneous Precipitation With Sulfamic Acid, Elizabeth Ann Kunst
Gravimetric Determination Of Barium By Homogeneous Precipitation With Sulfamic Acid, Elizabeth Ann Kunst
Bachelors’ Theses
Work was undertaken to confirm the results reported by W.y. Wagner and J.A. Wuellner in Analytical Chemistry, 24, 1031 (1952) for the gravimetric determination of barium by homogeneous precipitation with sulfamic acid, to determine the effects produced by slight modifications in procedure, and to investigate the feasibility of separating mixtures of barium and calcium by this method.
The Dielectric Strength Of Some Anti-Corrosive Paints, John Harvey Gustafson
The Dielectric Strength Of Some Anti-Corrosive Paints, John Harvey Gustafson
Masters Theses
"Metals undergo chemical reaction with nonmetallic elements of their surroundings to produce compounds which are either oxides or salts. These corrosion products, as they are called, may accelerate, impede, or have no influence on the course of further corrosion. It is unfortunate that iron, the metal of greatest use to man, receives very little protection from its corrosion products. There are no easy or inexpensive means of prevention of this corrosion and at best the reactions can only be controlled. One method of control is the use of anti-corrosive paints. Their protection is produced by placing an inert, continuous, and …
Tetracycline-7-Boronic Acid, William Denham Rhoads
Tetracycline-7-Boronic Acid, William Denham Rhoads
University of the Pacific Theses and Dissertations
The objective of this study is the preparation of a tetracycline-boron-10 derivative which is stable under biological conditions. The boron-10 should then provide a concentration of material capable of accepting thermal neutrons, thus producing localized high-energy alpha radiation. The fact that the tetracyclines are not retained by normal tissue should remove the danger of destruction of this tissue.
Preparation And Ultra-Violet Absorption Studies Of Leucocyanides Of The Triarylmethane Dyes, Arthur Katzakian Jr.
Preparation And Ultra-Violet Absorption Studies Of Leucocyanides Of The Triarylmethane Dyes, Arthur Katzakian Jr.
University of the Pacific Theses and Dissertations
No abstract provided.
Oxygen Permeability Of Free Paint Films, Janice I. Kellerman
Oxygen Permeability Of Free Paint Films, Janice I. Kellerman
Masters Theses
"As early as the mid 1800’s investigations were performed on the gas passage through rubber, but it is only comparatively recently that plastic polymeric materials have come into prominence. One interesting aspect of much experimentation begun was that of permeability, and it was soon evident that, in general, polymeric materials have extremely low permeability of gases. This is, in essence, the basis for use of plastics as packaging materials, balloons, and in many other designs and fabrications where it is desirous and/or necessary to exclude air.
There are several variables which must be taken into consideration in the evaluation of …
Spectroscopic Studies Of Metal-Cyanide Complexes: Part 1: Infrared And Visible Absorption Studies Of Cyanide Complexes Of Ni(Ii) In Aqueous Solution, Part 2: An Analysis Of The Infrared Vibrational Spectra Of The Tetracyanonickelate(Ii) Ion In The Solid State, Roy L. Mccullough
Chemistry and Chemical Biology ETDs
In this work, further evidence has been collected establishing the existence of a new ionic species in solutions of sodium tetracyanonickelate(II) and sodium cyanide. Contrary to the literature, however, this work shows that the species is [Ni(CN)5]-3 rather than [Ni(CN)6]-4.
Colorado "Rush To The Rockies Centennial" Spectroscopy Conference
Colorado "Rush To The Rockies Centennial" Spectroscopy Conference
Rocky Mountain Conference on Magnetic Resonance
Program from the Colorado "Rush to the Rockies Centennial" Spectroscopy Conference, sponsored by the Rocky Mountain Spectroscopy Society. Held in Denver, Colorado, August 10-11, 1959.
The Cytochrome Composition Of Bacillus Subtilis And Bacillus Megaterium, John Harvey Mangum
The Cytochrome Composition Of Bacillus Subtilis And Bacillus Megaterium, John Harvey Mangum
Theses and Dissertations
A spectroscopic and enzymatic investigation of the cytochromes of B. megaterium and B. subtilis was conducted. Attempts were made to isolate and characterize the individual cytochromes as well as to determine the locale of such activities as cytochrome c oxidase, DPNH oxidase, succinic dehydrogenase, cytochrome c reductase and diaphorse. Only two methods proved effective in liberating the cytochromes; disruption of the cells with sonic osillations and grinding tlhe cells with alumina. These procedures caused a fragmentation of the cell membrane. It was found that the entire cytochrome complement of these two bacteria was bound intimately to particles which most likely …
Substituted Triphenyl Tetrazolium Chlorides, Lawrence Donald Hanback
Substituted Triphenyl Tetrazolium Chlorides, Lawrence Donald Hanback
Master's Theses
The work in this thesis is a continuation of a project started at the University of Richmond in 1952 by A. G. Richardson under the directorship of Dr. J. S. Pierce and Dr. George z.Williams, Director of Clinical Pathology, National Institutes of Health, Bethesda, Maryland.
The purpose of the research was to prepare triphenyl tetrazolium salts, substituted, particularly in the ortho and para positions, with various electron accepting and electron donating groups. It was hoped that these substitutions would impart enough differences in the properties of the compounds so as to allow d etection of certain biological reactions. The tetrazolium …
An Investigation Of Metallic Rhenium, Rhenium Dioxide And Rhenium Chlorides As Catalysts In The Hydrogenation Of Certain Organic Substrates, Walter William Brown
An Investigation Of Metallic Rhenium, Rhenium Dioxide And Rhenium Chlorides As Catalysts In The Hydrogenation Of Certain Organic Substrates, Walter William Brown
Theses and Dissertations
The purpose of the present investigation was to examine the various analytical methods to ascertain the suitability of the methods for our use in determining the amount of rhenium used in our catalysts, and, if necessary devise a new method. Also, several catalysts were to be prepared and used in hydrogenation or organic compounds. Evaluation of the catalytic activity of each catalyst was to be made by using them with various selected organic substrates.
Liquid Scintillators. Some Aryl Substituted Phenanthrenes And Dihydrophenanthrenes, And Related P-Terphenyls And P-Quaterphenyls, Stephen Paul Birkeland
Liquid Scintillators. Some Aryl Substituted Phenanthrenes And Dihydrophenanthrenes, And Related P-Terphenyls And P-Quaterphenyls, Stephen Paul Birkeland
Chemistry and Chemical Biology ETDs
With the advent of good commercially available photomultiplier tubes, scintillation counters have become increasingly popular for laboratory use. Although there are a number of materials such as ionic crystals, covalent crystals, plastics, and liquid organic solutions, which are used in scintillation counters, liquid organic solutions offer distinct advantages. Because the organic solutes used in liquid scintillation systems have decay times of the order of 10-8 second, systems with resolving times of the order of 5x10-10 second may be obtained. This represents an improvement by a factor of 104 over gas counters and 102 over scintillation systems …