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An Ultrastructural Investigation On The Origin Of Murine Langerhans Cells, Stanley Powell Tompkins

Master's Theses

The mammalian epidermis has been described as consisting of three different cell populations: keratinocytes, pigment cells, and Langerhans cells. Ultrastructural investigations of mamalian skin within the last decade have resulted in criteria whereby these cell types can be differentiated upon electron microscopic examination.

The present study was undertaken to investigate the occurrence of epidermal Langerhans cells in both neural crest-free and normal PET mouse skin, and to present evidence for a possible origin of the epidermal Langerhans cells of murine skin.

Digitaria Adscendens And D. Sanguinalis (Gramineae) In Arkansas, Albert Robinson Jr.

Journal of the Arkansas Academy of Science

No abstract provided.

Inhabition Of Stapylococcus Pyogenes Var. Aureus With Ethanol-Extracted Precipitates Of Cephalobus Sp. (Nematoda: Cephalobidae), Rollin H. Heinzerling

Dissertations and Theses @ UNI

The purpose of this investigation was to make a preliminary biochemical study of the inhibition by an extract of the nematode Cephalobus and to test the inhibitive effect of the extract on the growth of Staphylococcus pyogenes var. aureus . Emphasis was placed upon the con - centration of inhibition-producing precipitates and correlating them with growth of S. aureus. Also investigated was the molting phenomenon of nematodes and its relation to inhibition-producing precipitates . Precipitates from ethanol extraction of the nematode of various days growth were tested for inhibition of S. aureus. Nematode-ethanol- precipitates which were eight , fifteen, twenty-one, …

Estimating Surface Area Of Soybean Root Systems, John B. Carlson

Journal of the Minnesota Academy of Science

A procedure for estimating the total root length, root surface, and root hair surface is described for greenhouse-grown soybeans. Data are presented on the extent of the root systems of 3-week and 14-week old soybeans. The possibility of correlating data from greenhouse-grown soybeans with that of field-grown soybeans as a method to make some predictions on extent of the root systems of field-grown soybeans is suggested.

Plants For Classroom Use, Elizabeth Wagner Reed

Journal of the Minnesota Academy of Science

The importance of having living plants in the classroom is emphasized. Ways of coping with environmental problems of classroom heal and dryness are outlined, including the making of terraria. Varieties of plants found suitable for the classroom and laboratory are described.

Propagation Of Pike In Multi-Purpose Lake Management, Oliver M. Jarvenpa, Warren Kirsch

Journal of the Minnesota Academy of Science

Methods for rearing, harvesting, and management use of pike (Esox lucius L) in Minnesota are described, especially as related to multiple use of shallow water areas. Principal emphasis is placed on the method of removing fingerling and yearling pike in winter from shallow lakes. Such lakes often raise wild rice and also are utilized by waterfowl. The pike, spawned naturally in these lakes, are harvested by pumping aerated water through fish traps when oxygen levels in the lake become low. Pumping is most effective when oxygen levels in the lake fall below 2 parts per million but is higher in …

Mayfly Cholinesterase: Solubilization And Partial Purification, Burton C. Lidgerding, Donald J. Kraft

Journal of the Minnesota Academy of Science

A method hos been developed for the solubilization of cholinesterase from whole mayflies (Hexagenia bilineata, Soy). Solubilization is enhanced through the use of: (1) protamine sulfate, (2) sephadex, (3) sodium taurocholate, and (4) ammonium sulfate-sodium bicarbonate treatments. Partial purification of the enzyme is also reported. Fractions representing a final activity of 246 units and a purification factor of 17.79 are presented.

Embryogenesis, Histology, And Organology Of The Ovary Of Brevoortia Patronus, Ralph M. Combs

Gulf and Caribbean Research

One hundred ninety-one large scale menhaden, Brevoortia patronus, ranging in age from larvae to sexually mature females were used in this study. Collections were made in the littoral and shallow off shore waters of the Gulf of Mexico from Dauphin Island, Alabama, westward to West Bay, Louisiana, at intervals throughout a five year period. Using standard paraffin techniques a number of staining methods were employed. Cytological and histological accounts are presented of the tissue elements of the gonads beginning with inception in the larvae, sexual differentiation to the sexes, and the cyclic changes associated with oogenesis and spawning in …

Pasture Seed Production In Western Australia, B J. Quinlivan

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

Pasture seed production in Western Australia is an industry with a somewhat turbulent past. Booms and slumps have been the rule rather than the exception.

However, during the past few years there has been some degree of "stability"—if not in price, at least in terms of total production.

How Important Are Wild Oats?, J G. Paterson

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

WILD OATS tend to grow best on heavy, fertile land. They can be a particular problem in wheat crops where soils of this type predominate.

Trials have shown that wild oat competition is more important in a high yielding wheat crop than it is in a low yielding one. The extent of this competition is described in this article.

Dormancy And Life Span Of Saffron Thistle Seeds, B J. Quinlivan, J. R. Pierce

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

RESEARCH in the Geraldton area has indicated that seeds of the saffron thistle (Carthamus lanatus) spread their germination over some seven years but most germinate in the first two years.

Factors influencing the rate of germination and the survival of seeds are the depth of burial and the presence of termites in the soil.

Superphosphate For Wheatbelt Pastures : Rates Of Application, Walter Jacob Cox

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

BECAUSE Western Australian soils are low in phosphorus, frequent applications of superphosphate are required for both crop and pasture production. The recommended rates are determined from the results of field experiments that test different quantities of super and measure the extra yield.

This article discusses the recommended rates of superphosphate in relation to soil type and superphosphate history. Methods of application and time of topdressing are also discussed.

Poison Plants Of Western Australia : The Toxic Species Of The Genera Gastrolobium And Oxylobium : Champion Bay Poison (G. Oxylobioides Benth.), Sandplain Poison (G. Microcarpum Meissn.), Cluster Poison (G. Bennettsianum C.A. Gardn.), Hutt River Poison (G. Propinquum C.A. Gardn.), Gilbernine Poison (G. Rotundifolium Meissn.), T E H Aplin

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

THIS article deals with five species of the genus Gastrolobium. The plants look rather similar so in the past have often been confused. They occur over a considerable area of the agricultural region of Western Australia.

Poison Plants Of Western Australia : The Toxic Species Of The Genera Gastrolobium And Oxylobium : Net-Leaf Poison (O. Racemosum (Turcz.) C.A. Gardn.), Brother-Brother (O. Tetragonophyllum E. Pritzel), Rigid-Leaf Poison (O. Rigidum C.A. Gardn.), Slender Poison (O. Heterophyllum (Turcz.) Benth.), Round-Leaf Poison (G. Pycnostachyum Benth.), T E H Aplin

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

THIS article deals with five toxic species, all of which are found in the Eyre district of the South-Western region of Western Australia.

Twelfth Random Sample Laying Test : 1968-69 : Cages, Department Of Agriculture, Western Australia

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

TWELFTH RANDOM SAMPLE LAYING TEST, 1968-69 - CAGES

POULTRY RESEARCH STATION, WEMBLEY

FOURTH PROGRESSIVE REPORT TO 1st JUNE, 1969 Average age of birds 308 days or 44 weeks.

On Temperature And Heat Flow In Tree Stems, Lee Pierce Herrington

Yale School of the Environment Bulletin Series

No abstract provided.

Subject Index For Physiological Aspects Of Crop Yield

Department of Agronomy and Horticulture: Faculty Publications

Subject Index
8 pages
Anatomy [to] Yield, requirement

Feeding Behavior And Analysis Of Regurgitated Food Collected From The Cattle Egret Bubulcus Ibis And The Little Blue Heron Florida Caerulea, Earl L. Hanebrink, Gene Denton

Journal of the Arkansas Academy of Science

No abstract provided.

Electrophoretic Patterns Of Plasma Proteins And Hemoglobin Of The Pigeon Columba Liva Domestica, Lloyd D. Snow, Earl L. Hanebrink, Bob D. Johnson

Journal of the Arkansas Academy of Science

No abstract provided.

Spiders Collected From Mud-Dauber Nests In Clark County, Arkansas, Peggy Rae Dorris

Journal of the Arkansas Academy of Science

No abstract provided.

Survey Of The Helminth Parasites Of Selected Game Fishes Of Lake Fort Smith, Arkansas, David A. Becker, Walter C. Houghton

Journal of the Arkansas Academy of Science

No abstract provided.

Some Noteworthy Species Of The Arkansas Flora, Gary E. Tucker

Journal of the Arkansas Academy of Science

No abstract provided.

Freshwater Algae Of Arkansas, Richard L. Meyer

Journal of the Arkansas Academy of Science

No abstract provided.

Survey Of The Arkansas Campanulaceae (Including The Lobeliaceae), Edwin B. Smith

Journal of the Arkansas Academy of Science

This paper is a summary of the Campanulaceae of Arkansas, based on the material on file in the University of Arkansas herbarium. A key to the species is included, followed by an alphabetical listing by genus and species of the taxa in the Campanulaceae known to occur in the state. After each taxon, the following information is included in this order: blooming period (as indicated on our material), known distribution in general terms (NW-northwest, E-east, G-general, C- central, etc.), habitat, chromosome number (as reported in Darlington & Wylie, 1955; in the Index to Plant Chromosome Numbers, Vol. I.II, and Supplement; …

Study Of The Herbaceous, Vascular Plants From Selected Sites In Faulkner County, Arkansas, Sara Mills Barnett

Journal of the Arkansas Academy of Science

No abstract provided.

Dardanelle Reservoir Illinois Bayou Embayment Background Survey, Clarence B. Sinclair

Journal of the Arkansas Academy of Science

No abstract provided.

More Butterfat Per Acre At Denmark Research Station, Department Of Agriculture, Western Australia

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

STOCKING rates on dairy farms are generally too low and can be substantially increased, but unfortunately there is no satisfactory measurement to indicate the potential of a particular pasture or environment.

A trial carried out on Denmark Research Station in 1966-67, to obtain information on carrying capacity of a dryland kikuyu-subterranean clover pasture.

Metabolic Sinks, Harry Beevers

Department of Agronomy and Horticulture: Faculty Publications

The continued growth of higher green plants well supplied with water and inorganic nutrients depends primarily on (i) the accomplishment of photosynthesis in the leaves and (ii) the transport of organic compounds from the leaves to heterotrophic cells which constitute metabolic sinks.

Light Interception And Radiative Exchange In Crop Stands, John Monteith

Department of Agronomy and Horticulture: Faculty Publications

Crops grow and use water because they intercept radiation from the sun, the .sky, and the atmosphere. Diurnal changes of solar radiation dictate the diurnal course of photosynthesis and transpiration, and the vertical gradient of radiant flux in a canopy is a measure of the absorption of energy by foliage at different heights. Without exaggeration, the distribution of radiation within a plant community is the most important single element of microclimate.
Early ecological studies of radiation climate were mainly descriptive and were limited in scope by rather primitive instrumentation. A new quantitative approach to the subject was initiated by Monsi …

Physiological Significance Of Internal Water Relations To Crop Yield, R. O. Slatyer

Department of Agronomy and Horticulture: Faculty Publications

The overall effects of water deficits on crop yield are known to everybody. Moderate water deficiencies can result in stunting, distorted development, and much reduced crop yields, and prolonged drought can cause complete crop failure.
Despite these visible symptoms of deficiency, a clear and unambiguous statement as to the effect of deficits on crop yield is difficult to make, for a variety of reasons. Firstly, despite the importance of the phenomenon to agriculture in most of the food producing countries of the world, relatively little attention has been devoted to its water deficits. Secondly, and in part this is a …