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Life Sciences

1972

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Full-Text Articles in Physical Sciences and Mathematics

Impact Of P.L. 480 Aid On India's Money Supply And External Debt-Service Obligations: A Look Ahead, Center For Agricultural And Economic Development, Iowa State University, Uma K. Srivastava Dec 1972

Impact Of P.L. 480 Aid On India's Money Supply And External Debt-Service Obligations: A Look Ahead, Center For Agricultural And Economic Development, Iowa State University, Uma K. Srivastava

CARD Reports

Inflation has been a major factor affecting the rate of development in most if not all countries of the world. It increases uncertainty of investment and affects the welfare of all citizens, especially those in the lower income strata. Thus, the possibility that inflation may result from shipments of food to nations under a program established partially to improve the welfare of low income people and encourage economic development raises serious questions. Since it is of such a serious nature, economic analysis is required (1) to define the economic relationships involved in food aid shipments to allow a clear understanding ...


On Improved Wkb (Uniform Asymptotic) Quantum Conditions, Dunham Corrections, The Langer Modification, And Rkr Potentials, Russell T. Pack Dec 1972

On Improved Wkb (Uniform Asymptotic) Quantum Conditions, Dunham Corrections, The Langer Modification, And Rkr Potentials, Russell T. Pack

Faculty Publications

An improvement to the WKB quantum condition for the rotation-vibration levels of diatomic molecules, known empirically to give RKR potentials of increased accuracy and to account for the Dunham correction Y00, is derived using uniform asymptotic methods. The role of the Langer transformation in this problem is also discussed.


A Five Sector Model Of Agricultural Development, Industrialization And Food Aid In A Dual Economy, Center For Agricultural And Economic Development, Iowa State University, Walter W. Haessel, Earl O. Heady, Leo V. Mayer Nov 1972

A Five Sector Model Of Agricultural Development, Industrialization And Food Aid In A Dual Economy, Center For Agricultural And Economic Development, Iowa State University, Walter W. Haessel, Earl O. Heady, Leo V. Mayer

CARD Reports

The over-all purpose of this study is to investigate the inter-relationships between the agricultural and nonagricultural sectors during the process of economic development, with some particular attention to the effects of food aid. The major portion of the study is devoted to a theoretical analysis of these intersectoral relationships. A five-sector, optimizing model of an underdeveloped, dual economy is formulated and extensively analyzed. The five sectors include subsistence or traditional agriculture, commercial agriculture, manufacturing goods production, capital goods production, and a government sector. Three products are produced: agricultural goods, which can only be consumed, manufacturing goods which can either be ...


Phytoplankton Successions And Lake Dynamics In Las Vegas Bay, Lake Mead, Nevada, Ervon R. Koening, Richard W. Tew, James E. Deacon Oct 1972

Phytoplankton Successions And Lake Dynamics In Las Vegas Bay, Lake Mead, Nevada, Ervon R. Koening, Richard W. Tew, James E. Deacon

Publications (WR)

Phytoplankton successions, applications of the general growth equation, and physical measurements have been employed to investigate events occurring at the interface between industrial and sewage effluent contained in Las Vegas Wash and the waters of Lake Mead, Nevada. The data indicate that the entering waters tend to form a density current interrupted at intervals by dynamic effects generated in the lake. The dynamic relationships described here for the spring months suggest that a much more thorough understanding of physical, chemical and biological interactions is necessary to permit solution of the numerous problems of Las Vegas Bay discussed or alluded to ...


A Mathmatical Model Of Primary Productivity And Limnological Patterns In Lake Mead, Lorne G. Everett Sep 1972

A Mathmatical Model Of Primary Productivity And Limnological Patterns In Lake Mead, Lorne G. Everett

Publications (WR)

The temporal and spatial changes in chemical and biological properties of Lake Mead have been investigated, thereby indicating the sources of water pollution and the time of highest pollution potential. Planktonic organisms have been shown to indicate the presence of water problems. Macro- and micro-nutrient analyses have shown that primary productivity is not inhibited by limiting concentrations. A mathematical model has been developed, tested with one set of independent data, and shown worthy of management utility. Although the model works very well for the Lake Mead area, the physical reality of the Multiple Linear Regression equation should be tested on ...


A New Species Of Menoceras From The Marsland Formation Of Nebraska, Lloyd G. Tanner Jul 1972

A New Species Of Menoceras From The Marsland Formation Of Nebraska, Lloyd G. Tanner

Bulletin of the University of Nebraska State Museum

Further study indicates that the Menoceras remains collected from the "Bridgeport Quarries" (lower port:on or the Marsland Formation, Middle Miocene, of the Hemingford Group) are of a new species.

In 1962, these dicerathere remains were considered to be a geologic variety of Diceratherium niobrarensis (Stecher, Schultz, and Tanner). However, later (Tanner, 1969) a generic distinction was revived, separating the Menoceras Troxell from Diceratherium Marsh. Diceretherium niobrarensis was then placed in synonymy with Menoceras arikarense (Barbour).

The new species is an intermediate between Menoceras arikarense (Barbour) from the Harrison Formation and Menoceras marslandensis Tanner, from the upper portion of the ...


Two Lynx-Like Cats From The Pliocene And Pleistocene, C. Bertrand Schultz, Larry D. Martin Jul 1972

Two Lynx-Like Cats From The Pliocene And Pleistocene, C. Bertrand Schultz, Larry D. Martin

Bulletin of the University of Nebraska State Museum

A new species (Lynx stouti) of small felid is described from the lower Pliocene of Colorado. This form has several characters in common with the modern Lynx and may be ancestral to that genus. A new subspecies of Lynx issiodorensis Croizet and Jobert is described as L. i. kurteni from the Mullen Assemblage, Cherry County, Nebraska. The relationships of this form to other lynxes are discussed along with the paleo-distribution of the genus.

The classification of the felinae has always been somewhat controversial, especially at the generic level. One fairly homogenous group of cats which has been separated from the ...


Agricultural And Water Policies And The Environment: An Analysis Of National Alternatives In Natural Resource Use, Food Supply Capacity And Environmental Quality, Center For Agricultural And Economic Development, Iowa State University, Earl O. Heady, Howard C. Madsen, Kenneth J. Nicol, Stanley H. Hargrove Jun 1972

Agricultural And Water Policies And The Environment: An Analysis Of National Alternatives In Natural Resource Use, Food Supply Capacity And Environmental Quality, Center For Agricultural And Economic Development, Iowa State University, Earl O. Heady, Howard C. Madsen, Kenneth J. Nicol, Stanley H. Hargrove

CARD Reports

American society has become increasingly concerned with several facets of economic and technological development. One element is population growth. With higher levels of population being projected for the future, particular distributions of industrial, urban and municipal demands for water will place rapidly growing pressures on its supply. However, economic development not only increases the demand for water but also utilizes technologies that produce outputs and byproducts which pollute streams and lessen water quality. Agricultural technology is closely related to these developmental problems in several ways: First, rapidly growing supply capacity based on modern technological inputs has caused farm prices and ...


Utilization Of U.S. Farm Surpluses For Welfare And Development Programs At Home And Abroad, Center For Agricultural And Economic Development, Iowa State University, Keith D. Rogers, Leo V. Mayer, Earl O. Heady Jun 1972

Utilization Of U.S. Farm Surpluses For Welfare And Development Programs At Home And Abroad, Center For Agricultural And Economic Development, Iowa State University, Keith D. Rogers, Leo V. Mayer, Earl O. Heady

CARD Reports

This report examines the potential impact, both at home and abroad, of distributing surplus food commodities at concessional prices to provide direct benefits to low-income consumers in the short run, and to promote economic development and raise real income levels in the long run. The problems of low-income consumers in the ghetto of New York or Los Angeles are the same as those of low income consumers in Bombay, India, or Seoul, Korea; only the degree of seriousness is different.


Phyletic Trends In Certain Lineages Of Quaternary Mammals, C. Bertrand Schultz, Lloyd G. Tanner, Lary D. Martin Jun 1972

Phyletic Trends In Certain Lineages Of Quaternary Mammals, C. Bertrand Schultz, Lloyd G. Tanner, Lary D. Martin

Bulletin of the University of Nebraska State Museum

Evolutionary trends in certain carnivores, rodents, bovids, and proboscideans are examined. Chronoclines are demonstrated for muskrats, beavers, mammoths, and bison. The Pliocene-Pleistocene boundary and Quaternary climatic fluctuations are also discussed.

The University of Nebraska State Museum contains a large stratigraphically controlled collection of Pleistocene animals. This collection provides a unique opportunity for the study of phyletic trends in certain lineages of mammals. Although a few phylogenetic lineages have been proposed (Schultz and Frankforter, 1946; Hibbard, et al., 1965), this has not been done for the vast majority of Pleistocene mammals. However, there is much more data available than this would ...


Oceanographic Data Collected In The Chesapeake Bight Of The Virginian Sea From 1966 Though 1969, E. P. Ruzecki, J. J. Norcross, F. J. Wojcik Jun 1972

Oceanographic Data Collected In The Chesapeake Bight Of The Virginian Sea From 1966 Though 1969, E. P. Ruzecki, J. J. Norcross, F. J. Wojcik

Reports

This report is intended to make unsynthesized oceanographic data readily available to the scientific community. 3 Similar reports are envisioned which will include physical, chemical, biological and geological data collected by personnel of the Virginia Institute ·of Marine Science in areas of the continental shelf, and coastal zone to include beaches, wetlands, estuaries and tidal rivers - areas in which the Commonwealth of Virginia has a vested interest.


Spiny Lobster Mariculture In The State Of Florida, W. Richard Boehmer May 1972

Spiny Lobster Mariculture In The State Of Florida, W. Richard Boehmer

Theses and Major Papers

The purpose of this paper is to introduce the reader to the Florida spiny lobster, Panuluris argus; to show the economic potential for the mariculture of this species by exposing value and size of the U. S. spiny lobster market; to present Florida’s legal provisions for mariculture and how spiny lobster farming would be acceptable; to indicate the biological considerations for the rearing of spiny lobster larva and postlarva; and to introduce a general plan for the mariculture of spiny lobster, that considers the legal provisions of leasing wetlands in Florida and incorporates the biological considerations of spiny lobster.


Potential Of Pompano Mariculture In Florida, James Anthony Elias May 1972

Potential Of Pompano Mariculture In Florida, James Anthony Elias

Theses and Major Papers

Pompano mariculture is not an attempt to bridge the protein gap, but it has been initiated to provide a constant source of this highly desired marine fish. The current market for pompano is small, however, this has been attributed basically to its supply. It appears from the literature that T. carolinus has the most dominant market position since it has an excellent flavor and sports fishermen prefer it due to its fighting ability when hooked on light tackle. It appears from the published history of attempts to raise pompano, by Berry and Iversen, that one of the major problems in ...


The Microtine Rodents Of The Mullen Assemblage From The Pleistocene Of North Central Nebraska, Larry D. Martin May 1972

The Microtine Rodents Of The Mullen Assemblage From The Pleistocene Of North Central Nebraska, Larry D. Martin

Bulletin of the University of Nebraska State Museum

The University of Nebraska State Museum has had an active collecting program in Hooker and Cherry counties, Nebraska, since the 1930's. The following University of Nebraska State Museum collecting localities have been extensively excavated: Cr-10, Cr-102, Cr-11, Ho-101, Ho-102, and Ho-103. These localities have produced a large vertebrate fauna described by Jakway as the Mullen Local Fauna which he considered for the most part to be Early lllinoian. Further study of this local fauna now demonstrates that assemblage does include Early as well as Middle Pleistocene animals. The purpose of this paper is to report on the evidence regarding ...


An Analysis Of Stock Densities And Harvest Of The Cutthroat Trout Of The Snake River, Teton County, Wyoming, John W. Kiefling May 1972

An Analysis Of Stock Densities And Harvest Of The Cutthroat Trout Of The Snake River, Teton County, Wyoming, John W. Kiefling

All Graduate Theses and Dissertations

An intensive creel census and marking program was conducted in 1969 and 1970 to make possible population estimates and estimates of harvest of cutthroat trout in the Snake River in Teton County, Wyoming. Stock density determinations made in one of the five study areas provided an estimate of 400 and 992 cutthroat trout, eight inches or more in length, per mile of stream in 1969 and 1970 respectively.

Harvest data provide an estimate of 5,207 and 5,903 cutthroat trout harvested in 1969 and 1970 respectively. The harvest estimates obtained in this study are not comparable to those made ...


Reproduction And Hematology Of The Cache Elk Herd, Thomas B. Follis May 1972

Reproduction And Hematology Of The Cache Elk Herd, Thomas B. Follis

All Graduate Theses and Dissertations

The initial three years of a 10-year reproductive study of elk involved three major phases. A fourth was added because of convenience. Objective 1 was to ascertain pregnancy rates in yearling and mature elk by rectal palpation, associate these rates with subsequent fall cow/calf ratios, and to test concurrently an ultrasonic fetal heart detector. Rectally observed anatomical changes in gravid uteri of cattle were directly applicable to elk. Ultrasonic detections of pregnancies in elk and deer were unsuccessful.

Pregnancy rates in the 1969-70 winter of 100 and 0 percent, respectively, for 19 adult and five yearling elk were associated ...


Some Aspects Of Conditioning Behavior In Rainbow Trout, Salmo Gairdneri, Reed E. Harris May 1972

Some Aspects Of Conditioning Behavior In Rainbow Trout, Salmo Gairdneri, Reed E. Harris

All Graduate Theses and Dissertations

Effects of exercise, social facilitation, and delayed conditioning after vi exercise on the learning behavior of 5 to 6-inch rainbow trout, Salmo gairdneri, was measured in a conditioned avoidance response apparatus. The conditioning schedule contained an intertrial interval between alternate presentations of conditioned (light) and unconditioned (shock) stimuli. This randomization eliminated learning losses found in a previous study. Mean percentage avoidance, the measurement of learning, did not decrease significantly during conditioning trials. Exercised fish learned avoidance better than did non-exercised fish. Mean percentage avoidance for fish exercised at 0.5 ft/sec was 66.3; at 1.0 ft/ sec ...


Model For Estimating Soil Water Flow, Water Content, Evapotranspiration And Root Extraction, Musa N. Nimah May 1972

Model For Estimating Soil Water Flow, Water Content, Evapotranspiration And Root Extraction, Musa N. Nimah

All Graduate Theses and Dissertations

A mathematical model was developed to predict water content profiles, evapotranspiration, water flow from or to the water table, root extraction and root water potential at the surface as functions of time under unsteady state conditions.

The model was tested in the field at The Hullinger Farm near Vernal, Utah, in 1970 and 1971. Comparison of water content-depth profiles show excellent agreement at the end of a 9- day run in 1970 on oats seeded to alfalfa. In 1971 with alfalfa as the crop, the data show best agreement, between predicted and computed water content-depth profiles, 48 hours after any ...


Population Biology Of The Black-Tailed Jackrabbit (Lepus Californicus) In Northern Utah, L. Charles Stoddart May 1972

Population Biology Of The Black-Tailed Jackrabbit (Lepus Californicus) In Northern Utah, L. Charles Stoddart

All Graduate Theses and Dissertations

Population biology of the black-tailed jackrabbit population on a 250-square-mile area in Curlew Valley, northern Utah, was studied from 1962-70. During this period the fall population density index increased from 40.0 in 1962, to 60.6 in 1963, decreased progressively to a low of 21.2 in 1967, then increased the following 3 years to a high of 185.0 in 1970.

Breeding was synchronous with four conception periods each year; in some years a fifth conception period was evident. The first conception period occurred about the last half of January; other periods followed at 40-day intervals indicating a ...


Methodological And Validation Study Of Seed Reserves In Desert Soils, David W. Goodall, Stuart Childs, Herman Wiebe Apr 1972

Methodological And Validation Study Of Seed Reserves In Desert Soils, David W. Goodall, Stuart Childs, Herman Wiebe

Memorandum

The development of a method for separating seeds from desert soils, and enumerating them, is described.

In the Great Basin desert, species differed greatly in their depth distribution, some having a peak at or just below the surface, while others were still abundant below 5 cm. Much higher seed densities were found beneath the canopies of shrubs and of tussock grasses than in the inter-spaces; no consistent differences were found, however, associated with the species of the canopy plant, or with distance from its center.

Tentative estimates are given of the seed population in the four validation sites in Curlew ...


Abstract Papers Apr 1972

Abstract Papers

Journal of the Minnesota Academy of Science

No abstract provided.


A Perspective On Economic Impact, L. Douglas James, Donald M. Soule, William O. Thompson, John L. Fulmer, John C. Redman, Robert C. Tussey, John M. Higgins, Claude M. Vaughan, David H. Rosenbaum, Billy R. Prebble, Charles O. Dowell, John E. Sirles, Michael B. Hargrove, Clyde T. Bates, Kenneth G. Holbrook, Dennis H. Bianchi, John P. Breaden, Kenneth R. Harman Mar 1972

A Perspective On Economic Impact, L. Douglas James, Donald M. Soule, William O. Thompson, John L. Fulmer, John C. Redman, Robert C. Tussey, John M. Higgins, Claude M. Vaughan, David H. Rosenbaum, Billy R. Prebble, Charles O. Dowell, John E. Sirles, Michael B. Hargrove, Clyde T. Bates, Kenneth G. Holbrook, Dennis H. Bianchi, John P. Breaden, Kenneth R. Harman

KWRRI Research Reports

The institutions responsible for water resources management in the United States have originated as political responses to major social issues. Each agency institutionalized a procedure for structuring and comparing alternatives in the formulation of its total program. Each agency originally sought to promote effective resolution of its social issue (flood control, development of arid lands, soil erosion, etc.), but more recent efforts have sought better coordination among agency practices through a common procedure largely derived from economic theory. Any procedure, however, varies in application with the interpretation and judgment of individual planners. Today, public pressures have brought political directives requiring ...


On The Mechanism Of Low-Temperature Termolecular Atomic Recombination, Russell T. Pack, Richard L. Snow, Wesley D. Smith Jan 1972

On The Mechanism Of Low-Temperature Termolecular Atomic Recombination, Russell T. Pack, Richard L. Snow, Wesley D. Smith

Faculty Publications

A simple theory of gas-phase termolecular atomic recombination kinetics is presented which treats the bound-complex (BC) mechanism in a fashion which parallels the Roberts, Bernstein, and Curtiss resonance theory of the energy-transfer (ET) mechanism. The ET rate constant has a low temperature maximum, but the BC rate constant does not. The contributions of the two mechanisms to the low-temperature recombination of hydrogen atoms, with He, Ar, and H2 as third bodies, are estimated and compared. The presence (absence) of a low-temperature maximum in the observable total rate constant is determined by absence (presence) of bound vibrational levels of the hydrogen-third ...


The Alfred C. Glassell, Jr.—University Of Miami Argosy Expedition To Ecuador, Donald P. De Sylva Jan 1972

The Alfred C. Glassell, Jr.—University Of Miami Argosy Expedition To Ecuador, Donald P. De Sylva

Studies in Tropical Oceanography

No abstract provided.


Long Term Rotation Trials, I C. Rowland Jan 1972

Long Term Rotation Trials, I C. Rowland

Experimental Summaries - Plant Research

LONG TERM ROTATION TRIALS The results shown are the yield of grain harvested from crops grown under various rotations of pasture ley. W56H, 66M29, 67N4, 67BA6, 68E5, 68SG5, 69GE20


Availability Of Native And Added Potassium In Some Iowa Soils , Arturo Suarez-Hernandez Jan 1972

Availability Of Native And Added Potassium In Some Iowa Soils , Arturo Suarez-Hernandez

Retrospective Theses and Dissertations

No abstract provided.


Critical Nitrogen Level Of Two Populus Clones: Growth, Nitrate Reductase And Allometric Response , Gary Frank Dykstra Jan 1972

Critical Nitrogen Level Of Two Populus Clones: Growth, Nitrate Reductase And Allometric Response , Gary Frank Dykstra

Retrospective Theses and Dissertations

No abstract provided.


Porosity And Iron Relationships In Loessial Prairie Soils Of Southern Iowa , Harlan Lee Mckim Jan 1972

Porosity And Iron Relationships In Loessial Prairie Soils Of Southern Iowa , Harlan Lee Mckim

Retrospective Theses and Dissertations

No abstract provided.


Artificial Structures And Microclimate In Relation To Pheasant Nesting , Kenneth Robert Russell Jan 1972

Artificial Structures And Microclimate In Relation To Pheasant Nesting , Kenneth Robert Russell

Retrospective Theses and Dissertations

No abstract provided.


Frost Injury To Cereals In W.A, M W. Perry, A. G. P. Brown Jan 1972

Frost Injury To Cereals In W.A, M W. Perry, A. G. P. Brown

Journal of the Department of Agriculture, Western Australia, Series 4

Late spring frosts commonly reduce yields and affect the quality of grain in wheat crops, especially in the southern, eastern and north-eastern districts. The damage is usually localised on individual farms, but is sometimes widespread.

Barley, and oats to a lesser extent, are also affected. Average losses of wheat in Western Australia have been estimated at 3 to 5 per cent, per year, or about 2 million bushels on current production figures.