Digital Commons Network^™

Environmental Manipulation For Higher Yields, Paul Waggoner

Department of Agronomy and Horticulture: Faculty Publications

My role in this chapter on environmental manipulations is making a prediction that can be used until experiments render the final verdict.
In chapters preceding mine, an array of physical and physiological phenomena for affecting yield has been laid before the grower of plants. Predicting whether environmental manipulation will increase yield requires that all of these phenomena be considered for foreign lands are littered with the bleaching bones of immigrant varieties and practices that were ambushed by an unsuspected environmental difference.
Interaction is the Scylla of biologic prediction. Formerly we predicted by drawing a curve or writing a formula relating …

Cultural Manipulation For Higher Yields, William Duncan

Department of Agronomy and Horticulture: Faculty Publications

By cultural manipulation we will mean, in a broad sense, everything a farmer might do to increase crop yields per hectare, after he decides what to plant and buys the seed. With this restriction we leave out the agricultural economist and the plant breeder. When we limit our interest to yields per hectare we introduce an element of area. This will include the crop canopy above the surface and the root system below it. Cultural manipulation also includes what the farmer might do to make best use of water, carbon dioxide, nitrogen, and essential mineral nutrients whether they occur naturally …

Development, Differentiation, And Yield, John Heslop-Harrison

Department of Agronomy and Horticulture: Faculty Publications

The task of reviewing some of the ways development and differentiation may act as determinants of economic yield would be much simpler had knowledge advanced to a point where the basic principles concerned in the control of these processes in eukaryotic organisms were clear. Unfortunately, this stage has not yet been reached. There is no shortage of schemes and hypotheses to set beside a mountain of observational and experimental data, but the unifying thread which might allow us to pick out the significant and reject the irrelevant in any particular context is still lacking. What is incontestable is that development …

Plant Morphology And Stand Geometry In Relation To Nitrogen, Robert F. Chandler Jr.

Department of Agronomy and Horticulture: Faculty Publications

During the past decade, the importance of plant morphology and spacing in relation to nitrogen responsiveness in terms of crop yield has been increasingly recognized, particularly in the case of the cereal grains.
It is the purpose of this paper to present examples of experimental results obtained by rice research workers which support certain significant principles. Although this treatise will be confined to the rice plant (Oryza sativa L.),as Wittwer (1968) points out, the principles elucidated are applicable to many other crops, and particularly to the small grains, such as wheat (Triticum aestivum L.), oats (Avena sativa …

Rollins Adams Emerson (1873-1947) Horticulturist Pioneer Plant Geneticist Administrator Inspiring Student Adviser, Rosalind Morris

Department of Agronomy and Horticulture: Faculty Publications

The vigorous and highly productive life of Professor R. A. Emerson spanned 74 years and 7 months. His birth and death took place In New York State, but Nebraska nurtured his early development and schooling. He spent 15 years of his professional career at the University of Nebraska, followed by 33 years at Cornell University.

Rollins Adams Emerson, son of Charles David and Mary C. Adams Emerson (a direct descendant of Henry Adams), was born May 5, 1873 at Pillar Point, New York State on the eastern shore of Lake Ontario. In 1880 his family moved to Nebraska and settled …

The Identification Of Cis-Ii, I2-Methylene-2-Hydroxyoctadecanoic Acid From Thiobacillus Thiooxidans, H. W. Knoche, J. M. Shively

Department of Biochemistry: Faculty Publications

A polar fatty acid has been observed as a component of an

ornithine-containing lipid of Thiobacillus thiooxidans. A

comparison of thin layer chromatographic mobilities of reference

compounds to those of the natural acid and its derivatives

suggested that the acid was a 2-hydroxy fatty acid.

The presence of a cyclopropane function in the acid was

indicated by l4e-Iabeling experiments and infrared spectroscopy.

Mass spectrometry of the methyl ester and the acetylated

methyl ester of the natural acid provided a molecular

weight for the acid. Equivalent chain lengths were determined

for the natural acid, the acid obtained by oxidative

decarboxylation of …

Systems Analysis Of Natural Resources And Crop Production, Marion Clawson

Department of Agronomy and Horticulture: Faculty Publications

Human history is a seamless web; every event has its antecedents, its contemporaries, and its consequences. Each event arises out of the past, each is associated with other events at the time, and each leads to new events, in an endless chain. Indeed, there is difficulty in isolating any single event; when did it begin, what are its boundaries, when did it end? These are some of the problems of the social scientist generally, and of the historian in particular.
Nature is equally a seamless web. Every natural process or event has its cause or antecedent, each takes place within …

A Discussion Of The Cytherinae (Ostracoda) With Description Of Two New Species, Leslie Edward Watling

University of the Pacific Theses and Dissertations

This paper is concerned with the description of two new ostracod species, and the discussion of their affinities with other species in the subfamily Cytherinae. In this discussion reference is made to the morphological features of several genera. At this point it must be made clear that although the original type descriptions were used, the author has never seen the type specimens. Thus, all discussion is based on these original descriptions as well as on available supplementary material.

Respiratory Quotient During Metamorphosis Of Hyla Regilla Tadpoles, James Frederic Welles

University of the Pacific Theses and Dissertations

Metamorphosis may be defined as postembryonic developmental changes in non-reproductive structures of an organism. Such changes anticipate changes in the organism's environment (Frieden, 1961). Metamorphosis of amphibian larvae is dependent on the thyroid hormone in the circulating body fluid, and the normal sequence of metamorphosis has been correlated with a progressive increase in the concentration of thyroxine in the blood (Barch, 1953; Moore, 1964).

While the rate of oxygen uptake in developing tadpoles has been well studied and documented, only a single reference on carbon dioxide release could be found. Belehradek and Huxley (1927) noted that carbon dioxide output increased …

Cytophotometric Determinations Of Dna In Normal And Klinefelter's Karyotypes In Man, Howard Orval Henrichs

Masters Theses

No abstract provided.

Mammalian Cell Genetics I. Selection And Characterization Of Mutations Auxotrophic For L-Glutamine Or Resistant To 8-Azaguanine In Chinese Hamster Cells In Vitro, E. Virginia Merriam

Biology Faculty Works

No abstract provided.

Successional Patterns In Diverted Croplands Of Crawford County, Illinois, Norman Tracy

Masters Theses

No abstract provided.

Cocoon Production And Development In The Turbellarian Procotyla Fluviatilis, Terry M. Wunderle

Masters Theses

No abstract provided.

Forelimb Regeneration Study In The Adult Small-Mouthed Salamander (Ambystoma Texanum), John Farrell Williams

Masters Theses

No abstract provided.

A Study Of Syngnathus Scovelli In Fresh Waters Of Louisiana And Salt Waters Of Mississippi, Edward Caldwell Whatley

Gulf and Caribbean Research

A breeding population of Syngnathus scovelli was discovered in 1960 in Lake St. John near Ferriday, Louisiana, which is over 300 river miles from the Gulf of Mexico by the shortest possible route. Although S. scovelli has been known to be euryhaline, this constitutes the first record of a breeding population in fresh water.

This study encompassed the period from July 1960 through February 1966. During this time S. scovelli were maintained for varying periods of time in fresh water aquaria. The longest period of time any one specimen lived in captivity was from 29 September 1960 until 16 November …

Survey Of Marine Cercariae From The Coasts Of Marin And Sonoma Counties, California, Carl Erik Olson

University of the Pacific Theses and Dissertations

This study deals with the cercarial fauna of marine mollusks in the littoral zone and estuaries of the California coast between Duxbury Reef and Fort Ross. The investigation began in June, 1968 at the Pacific Marine Station, Dillon Beach, California and continued through July, 1969, with monthly collections at various localities (see map). Two major objectives were aimed at: first, to continue a survey of the cercariae of the area begun by Fisk (194) and second, to establish a basis for future life history studies.

The Functional Morphology Of Axiothella Rubrocinta (Johnson), Robert Bernard Spies

University of the Pacific Theses and Dissertations

The family Maldanidae is a group of sedentary polychaetes having a cylindrical body with elongate, but relatively few segments. The prostomium has a dorsal pair of nuchal organs and may have eye-spots ventrally; true appendages are absent. The mouth opens ventrally on the peristomium and has an extrusible sacciform proboscis. The pygidium may be plate-shaped, funnel shaped with an internal cone, or simply cone-shaped. All maldanids inhabit tubes of sand or mud, and subject to the limitations and advantages of this habjtat.

Structure And Function Of The Alimentary Tract Of Batillaria Zonalis And Cerithidea Californica, Style-Bearing Mesogastropods, Andrew Locke Driscoll

University of the Pacific Theses and Dissertations

This study describes the structure and function of the alimentary tracts of B. zonalis and C. californica with particular emphasis on the stomach and style sac region. Both species were found to be generally similar to other styles bearing mesogastropods in that they have little or no development of glandular tissue in the esophageal region and a functional style is present in the stomach. The stomachs of both species are specialized to transport and digest a continuous supply of detritus by means of complex ridges, grooves and ciliary currents. C. californica appears more highly specialized for feeding on fine, highly …

A Study Of The Effects Of Sitosterol Ingestion On The Serum Cholesterol Concentrations Of Two Genetically Different Strains Of Laboratory Mice, Marie Nichols Goldberg

University of the Pacific Theses and Dissertations

A possible interrelationship between serum cholesterol level and atherosclerosis has long interested investigators in the fields of physiology and biochemistry. Cholesterol is found in very high concentrations in the plaques that occlude coronary arteries in man and laboratory animals. It is generally agreed that hypercholesterolemia favors the appearance of atherosclerotic lesions.^1<1

In recent years, much information has been accumulated regarding the factors which affect the serum cholesterol level. Exact and detailed biochemical mechanisms are still not clearly understood. However, it has been demonstrated that the serum cholesterol levels of man and several experimental animals can be lowered significantly by …

Gammaridean Amphipods From Tomales Bay, California, Walter Scott Gray

University of the Pacific Theses and Dissertations

The purpose of this study is to describe the sediment-dwelling, infaunal gammaridean amphipods of Tomales Bay and to relate their distribution to known variations in the physical environment. Also, the Tomales Bay amphipod fauna is compared to the faunas of other West Coast bays.

The Effects Of Light Quality And Culture Age On Protein Synthesis In Oscillatoria Species , Jon Chesnut

Master's Theses

No abstract provided.

Development Of A Prediction Equation For The Placement Of Students In Seventh-Grade Life Science, Lloyd Harley Barrow

Dissertations and Theses @ UNI

It was the purpose of this investigation to: (1) determine the relative value of intelligence quotient, Iowa Tests of Basic Skills composite standard score, Iowa Tests of Basic Skills reading comprehension standard score, final sixth-grade science mark, and the Reed General Science Test score in predicting the life science mark; (2) present the findings that would provide the bast possible estimate of success in life science; and (3) compare the prediction equation for the enrichment group with the non-enrichment group's prediction equation. The study involved students of seventh-grade life science for the school years 1963 through 1968, who were enrolled …

Aortic Cannulation As An Experimental Tool In ¹³⁷Cs Metabolic Studies, Lyman B. Spaulding

Biology ETDs

Tissue accumulations of cesium-137 by the white laboratory rat, Rattus norvegicus, were studied by varying the length of time between isotope introduction and sacrifice, the temperature of the animal, and the route of administration of the radioisotope. Most tissues from animals in the normothermic and hypothermic condition accumulated their major ¹³⁷Cs component within the first minute of isotope introduction. The temperature of the animal (18 C) was observed to influence tissue accumulation. Hypothermia limited uptake of radiocesium by peripheral tissues but enhanced uptake by internal tissues. Route of administration (i.a. and i.p.) differences were observed for only the heart …

Serum Immunoglobulins In The Differential Diagnosis Between Intrahepatic Viral Jaundice And Extrahepatic Obstructive Jaundice, Gerald A. Logrippo, Thomas A. Fox, Melvin A. Block

Henry Ford Hospital Medical Journal

Serum immunoglobulin levels are reported in 75 patients with jaundice: 32 with jaundice due to virus hepatitis and 43 with jaundice due to obstruction. The degrees and variations of serum immunoglobulins (Ig), (IgM, IgG and IgA) in virus hepatitis (IH and SH) with jaundice are compared with those found in obstructive jaundice. In 32 of the patients with jaundice from virus hepatitis, serum IgM (100%) and IgG (75%) were elevated above 2 Standard Deviations from the mean values. Neither IgM nor IgG levels were elevated above 2 Standard Deviations from the mean values in 33 of 43 patients (76.7%) with …

Agricultural Experiment Station News December 1968

Agricultural Research Division: News and Annual Reports

CONTENTS:
FROM THE ACTING DIRECTOR'S DESK
FIELD LABORATORY DEVELOPMENT - 1968
PERSONNEL ACTIONS
NEW GRANTS, CONTRACTS AND COOPERATIVE AGREEMENTS
GENERAL NOTES
AGRICULTURAL EXPERIMENT STATION PUBLICATIONS - DECEMBER 1968
STATION AND RESEARCH BULLETINS PRINTED

82nd Annual Report Of The Nebraska Agricultural Experiment Station

Agricultural Research Division: News and Annual Reports

Contents:
Foreword
Administration and Staff
Nebraska Agricultural Experiment Station Research Projects
Experiment Station Publications
Publications of the Staff
Report of Income and Expenditures

Comparative Osteology Of The Pelvic Girdles Of The Phyllostomatidae (Chiroptera; Mammalia), Dan W. Walton, Gloria M. Walton

Journal of the Graduate Research Center

The Chilonycterinae are the most primitive of the subfamilies of the Phyllostomatidae. Two basic groups comprise this subfamily: the first includes the genera Pteronotus and Chilonycteris; the second, the genus Mormoops. This grouping is based principally upon the characteristics of the humerus and the innominate. Within the subfamily Phyllostomatinae two types are recognized. The Macrotus-type is considered the more primitive, because of its resemblance to the chilonycterines, and the Phyllustomus-type the more advanced. From these two phyllostomatine groups are derived the more advanced lines of the Phyllostomatidae. The phyllonycterine line appears to be derived from the Macrotus-type. The sturnirine-glossophagine line …

The Prairie Naturalist Volume 1, No.4. December 1969

The Prairie Naturalist

EDITORIAL: Restoring Beauty to the Human Environment ▪ Paul B. Kannowski

A REQUIEM FOR THE PRAIRIE ▪ Hugh H. Iltis

BIRDING IN MY BACK YARD ▪ Mrs. George A. Anderson

OCCURRENCE OF THE CECROPIA AND ROCKY MOUNTAIN SILK MOTHS IN SOUTHWESTERN NORTH DAKOTA ▪ James Oberfoell

Publications Of The Staff Of The Henry Ford Hospital And The Edsel B. Ford Institute For Medical Research

Henry Ford Hospital Medical Journal

No abstract provided.

Department Of Entomology Newsletter - No. 3, 1968, Bruner Entomology Club, Jon J. Tollefson

Hexapod Herald and Other Entomology Department Newsletters

Bruner Entomology Club

University of Nebraska State Museum, Division of Entomology

Field Trip, 1968

Insect Pathology Program

New Staff: Earle S. Raun (Chairman), John B. Campbell, Thomas J. Helms

Undergraduates and Undergraduate Teaching

Staff: Roscoe E. Hill, Kenneth P. Pruess, James M. Shalk, J. Derril Munson, Walter R. Akeson, Robert E. Roselle, Donald E. Lawson, Earle S. Raun, S. Dean Kindler, Robert Staples, Lloyd W. Andersen, Harold J. Ball, George R. Manglitz, Paul C. Peterson, Calvin M. Jones, John B. Campbell, David L. Keith, Thomas J. Helms

Clerical and Technical Staff: Esther A. Schock, Carla M. Tollefson, Barbara J. Lloyd, …