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Hormonal Control Of Reproductive Activity In The Ewe, J. F. Wagner

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

There are many advantages which result from synchronizing the estrous period in a ewe flock. In situations where the ewes are not hand bred to the ram, the synchronization of estrus makes the application of artificial insemination (AI) techniques more efficient. Detection of estrus usually is more reliable in a synchronized flock. Only 3 to 4 days are needed to detect estrus in 90 percent of a synchronized flock, whereas 16 to 18 days are normally required. This allows the AI technician to plan the number of breedings and have semen available. When hormones are given in the feed, an …

The Effect Of Temperature On Algal Growth, E. Warren Potter

Masters Theses

No abstract provided.

Front Matter, Vol. 5 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 5 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

The Osteology And Myology Of The Head And Thorax Regions Of The Obesus Group Of The Genus Sauromalus Dumeril (Iguanidae), David F. Avery, Wilmer W. Tanner

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Lantana Montevidensis Briq., John W. Chapman

Specimens by Name

No abstract provided.

End Matter, Vol. 4 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 4 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 5 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 5 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Orthoptera Of The Nevada Test Site, Andrew H. Barnum

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Arthropod Associates Of Plants At The Nevada Test Site, Dorald M. Allred, D Elden Beck

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Presettlement Vegetation And Vegetational Change In Three Valleys In Central Utah, Earl M. Christensen, Hyrum B. Johnson

Brigham Young University Science Bulletin, Biological Series

Historical information, survey records, and relict vegetation were used as sources of data for determining the nature of the presettlement vegetation of Pavant, Round, and Juab Valleys in central Utah. The foothills were covered with bunch grasses (principally Agropyron spicatum and Poa secunda), scattered junipers (Juniperus utahensis), and sagebrush (Artemisia tridentate). Western wheatgrass (Agropyron smithii) was common on level areas within the foothills. Below the foothill region on the more gentle slopes and benchlands there was a broad belt dominated by bunch grasses. The grassy area intergraded into a zone dominated by northern …

Front Matter, Vol. 5 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Plants Of Arches National Monument, Bertrand F. Harrison, Stanley L. Welsh, Glen Moore

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 4 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 5 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 4 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Phytotoxic Substances From Soil Microorganisms And Crop Residues, T.M. Mccalla, F.A. Haskins

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The role of organic matter in the growth of plants has been a subject of much investigation and controversy since the sixteenth century. During the early era, decomposition of plant residues and green and animal manures provided a primary source of minerals for plant growth. In addition, beneficial effects on soil structure and water-holding capacity were attribute to the presence of organic matter. With the development of agricultural chemistry culminating in the work of Liebig in the nineteenth century, it was discovered that plants could make satisfactory growth in the absence of added organic matter if suitable kinds and amounts …

A Study On The Biochemistry Of Riboflavin In Higher Plants As Influenced By Iron, Dayna L. Stocks

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Riboflavin, 6,7-dimethyl-9-(D-1'-ribityl) isoalloxazine, has been studied extensively by workers in many fields of interest. Because of its almost universal occurrence in plants and its requirement by most animals as a vitamin, it is of interest to both the botanist and the zoologist. It is also of interest to the photochemist and its photo chemistry is currently being studied by several groups (27, 35, 47, 49). In addition riboflavin has been implicated in the photo inactivation of indole-acetic acid (16) and 2,4-D (20). It is also thought to be involved in the processes of bioluminescence (33, 48) and phototropism (17). At …

Culture And O-Hydroxycinnamic Acid Content Of Excised Melilotus Roots, Larry G. Williams, Francis A. Haskins, Herman J. Gorz

Department of Agronomy and Horticulture: Faculty Publications

Excised roots of biennial sweetclover were successfully cultured through repeated transfers on a modified White's medium solidified with agar. Roots also grew well in shaker-agitated liquid cultures over the pH range 4.5 to 7.0. Exposure of the cultures to bright illumination resulted in submaximal growth. No net synthesis of o-hydroxycinnamic acid was observed in the cultured roots.

Effect Of Fluoride On The Respiration Of Leaves From Higher Plants, Ming-Ho Yu

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Studies concerning the effects of fluoride on the metabolism of both animals and plants have been of interest to many workers. In plants, it has been known that fluoride will inhibit the growth, that it will induce chlorosis as an evidence of visible injury, and that necrosis will eventually result. The economic importance associated with fluoride damage has been widely recognized, and, as a consequence, fluoride has become a major problem of air pollution.

Influence Of Sodium And Calcium Chlorides In The Nutrient Solution On Secretions Of Salt Glands Of Tamarix Species, Don L. Chadwick

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Salt glands are an adaptation for living in saline habitats possessed by several species of plants. In the family of Plumbaginaceae at least three mangrove genera, Aegialitis, Aegiceras, and Avicennia, possess salt glands according to Scholander (1962). Salt glands of the small ornamental shrubs, Statice gmelini, and Limonium latifoluim of the same family, were studied by Ruhland (1915) and Arisz (1955). Spartina townsendii of the Graminaceae and Tamarix petandra, Tamarix hispida, and Tamarix aphylla of the Tamaricaceae families also have the glands.

Studies Of The Incorporation Of 5-Fluorouracil Into Tobacco Mosaic Viral Rna By Cell-Free Synthesing Systems Isolated From Infected Tobacco Plants, Helen Lu-Sheng Wang

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Research on biosynthesis of tobacco mosaic virus (TMV) ribonucleic acid in vitro has been reported by a number of laboratories (8, 16, 17). Bonner et al. postulated that ribonucleic acid could be synthesized from nucleotides by chromatin extracted from nuclei of pea seedlings (5, 14, 22). The evidence from in vitro synthesis of viral RNA suggested that an enzyme, RNA polymerase, links the four nucleotides (ATP, UTP, CTP, GTP) with viral RNA present as a primer and magnesium ions participating as a catalyst (7, 8).

Morphology, Fertility, And Cytology Of Diploid And Colchicine-Induced Tetraploid Fairway Crested Wheatgrass, William Tai

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Fairway crested wheatgrass, which is identified taxonomically as Agropyron cristatum (L.) Gaertn. (45), A. cristatiforme (38), or A. pectiniforme Roem. and Schult (22), is an economically important range grass belonging to the "crested wheatgrass complex" (24, 38). The crested wheatgrass complex includes diploid, 2n = 14, tetraploid, 2n = 28, and hexaploid, 2n = 42, forms (1, 11, 22). The variety Fairway and Fairway-like derivatives are the only known diploid members of the species complex (24, 38). Meiotic chromosome behavior of Fairway diploids appears to be typical of other diploid species; however, the number of plants examined …

Front Matter, Vol. 4 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 4 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Annotated Checklist Of The Plants Of Mesa Verde, Colorado, Stanley L. Welsh, James A. Erdman

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

A Taxonomic Study Of The Genus Galium In Minnesota, John E. Seaholm

Journal of the Minnesota Academy of Science

Galium is quite a commonplace, cosmopolitan genus in Minnesota. Most naturalists are familiar with one or more species such as the Northern Bedstraw, G. boreale, and Goosegrass, G. aparine. However, it may come as a surprise to many to learn that there are a total of eleven species and two varieties of Galium found growing within the boundaries of the state.

Because of the difficulties met with in trying to tell the species apart, it was realized soon after this study was initiated that a need existed for a clarification of their taxonomy as it related to the state flora. …

Insect Pests Of Cotton In The Ord River Irrigation Area, K T. Richards

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

COTTON is grown in the Ord Valley of north Western Australia, mainly as an annual, irrigated crop during the hot summer months of the "wet season".

It is usually planted in November-December and harvested March-May.

This period of growth corresponds closely to that of maximum insect activity.