Botany Commons^™

Claytonia Virginica L., C. Ben White

Specimens by Name

No abstract provided.

Viola Sagittata Ait., Deon M. Nontelle

Specimens by Name

No abstract provided.

Lantana Horrida Sensu Moldenke, Non Kunth, James A. Sutherlin

Specimens by Name

No abstract provided.

Viola Pensylvanica Michx., Deon M. Nontelle

Specimens by Name

No abstract provided.

Viola Triloba Schwein., Loy R. Phillippe

Specimens by Name

No abstract provided.

Viola Pallens (Banks Ex Ging) Brainerd, Deon M. Nontelle

Specimens by Name

No abstract provided.

Viola Sororia Willd., Deon M. Nontelle

Specimens by Name

No abstract provided.

End Matter, Vol. 16 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 16 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

The Hyobranchium And Throat Myology Of The Adult Ambystomidae Of The United States And Northern Mexico, John E. Krogh, Wilmer W. Tanner

Brigham Young University Science Bulletin, Biological Series

The 16 species and subspecies of the Ambystomidae of the United States are placed into six groups according to their throat morphology as follows: The Dicamptodon group, the Rhyacotriton group, the A. Annulatum–A. cingulatum group, the A. gracile-A. jeffersonianum-A. mabeei-A. macrodactylum-A. maculatum group, the A. talpoideum group, the A. opacum-A. texanum group, and the A. rosaceum-A. t. tigrinum-A. t. melanostictum-A. t. nebulosum group. Dicamptodon appears to be the most primitive group and Rhyacotriton the most specialized. Based on the morphology of the throat region it is suggested that A. rosaceum be placed in the tiger salamander group as a subspecies …

Xanthium Strumarium L.: Extraction And Assay Of Floral Promotive Principles And Additional Investigations Into Inhibition Of Flowering, David D. Gibby

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

New techniques in extraction and assay of florigenic substances were tested. Initial response to the buffer-PVP extracts proved promising, but after several successful experiments, results could not be duplicated. Possible reasons for the failure are discussed.

A long-day inhibitory effect, demonstrated earlier by Gibby and Salisbury (25), was further investigated. Experiments with ¹⁴C-labled assimilates disproved the hypothesis that the inhibition is a result of assimilate translocation. Other experiments pointed to the probability of phytochrome involvement as well as protein synthesis as part of the inhibitory process. The nature of inhibition was ascribed to a localized inhibitory condition, probably a …

The Action Of Antibiotics And Antimetabolites On The Tobacco Mosaic Virus Infection Process In Bean Leaves, Virendra Nayyar

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The action of 28 antibiotics and antimetabolites at varying concentrations was studied in coincidence with the bioassay of tobacco mosaic virus on detached bean leaves by using an ultrasonic method of inoculation developed by Lamborn, Cochran and Chidester.¹ All tested chemicals were classified, in regard to the virus infection process, as inhibitory or stimulatory and their optimal concentrations in the inoculum were determined. Of the 28 antibiotics and antimetabolites studied, eight were found to stimulate while twenty inhibited TMV infection in bean leaves. From the results of these experiments, an attempt was made to characterize the nature of the …

An Isolation And Partial Purification Of A Small Tobacco Mosaic Virus Nucleoprotein Unit And A Study Of Its Polymerization By Carbodiimides, Alicia Bruna De Tosso

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A small tobacco mosaic virus nucleoprotein unit, thought to be the basic infectious unit of TMV, was isolated and purified from systemically-infected Turkish tobacco leaves. This small TMV particle was characterized by a doughnut shaped form as shown in the electron micrographs and by the induction of gray lesions when inoculated on Scotia bean leaves. Four carbodiimides, organic chemical condensing reagents, were compared for effectiveness in inducing polymerization of this starting material into longer rod-shaped viral particles. Dicyclohexyl carbodiimide, a wax-like solid, was found to be the most suitable reagent when used with an organic solvent such as ethanol in …

Effects Of Six Herbicides On Three Common Fresh Water Algae, Mridulika Virmani

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Six herbicides (diuron, karbutilate, propham, chloropropham, atrazine and simazine) were tested for their effects on Chlorocuccum hypnosporum, Chlorella pyrenoidosa and Anabaena sp. Experiments were conducted to determine minimum lethal dosages, algicidal versus algistatic concentrations and the uptake of ¹⁴CO₂ fixation by diuron containing cultures, as well as the uptake of radioactive diuron.

All three investigated species have shown a high degree of sensitivity to diuron at or below 1 ppm. Karbutilate was found to inhibit the growth of Chlorella pyrenoidosa and Anabaena sp. at lower concentrations than were required in the case of Chlorococcum hypnosporum.

Chloropropham …

A Taxonomic Study Of Single Spikelet Elymus Species Of Western United States, Earl R. Jensen Jr.

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Two single-spikelet species, including three varieties, of naturally occurring wild-ryes of the genus Elymus native to the Rocky Mountain and Intermountain West were investigated using morphological, anatomical, ecological, and cytogenetical methods to determine their biosystematic relationships.

One species, Elymus ambiguus Vasey and Scribn., was found to be a distinct species without any recognizable varieties. This species had been previously recognized with three varieties.

One taxon, Elymus salina (C. L. Hitchc.) E. Jensen, often considered a variety of Elymus ambiguus, was found to be a distinct species. It shared features with both Elymus ambiguus and Elymus salina but was sufficiently …

An Analysis Of The Taxonomic Status Of A New Taxon In The Genus Salsola, H. Lamont Arnold

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

An attempt was made to determine the taxonomic status of a Salsola taxon new to Utah but found quite extensively in parts of Nevada, and California. The disciplines of cytogenetics, morphology, anatomy, chemotaxonomy, and palynology were employed.

It is the consensus of some taxonomists that this new taxon, referred to as Salsola X and which has lax perianth tips, is a variant of the Salsola Salsola paulsenii Litv. or barbwire Russian thistle taxon. Accepted taxonomic authorities on the Cheopodiaceae, Aellen and Botschantzev, consider the erect, spinose perianth tips to be a morphological character used in delimiting S. paulsenii. If …

Inorganic Mercury Uptake And Mercury Tolerance Demonstrated By Several Species Of Algae, Daniel S. Filip

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The inhibition by low concentrations of inorganic mercury has been established for several species of freshwater algae, and a method has been developed to determine mercury levels in algal cells, having good precision at levels as low as one hundred parts per billion.

Rapid sorption of inorganic mercury by glassware was minimized by using heavy algal cultures and short term incubations. The rates and extent of mercury uptake by three species of freshwater green algae were delineated under laboratory conditions. Replicate mercury containing cultures yielded slightly different mercury concentrations upon analysis due to analytical errors and glass sorption. Therefore, percent …

The Relationship Between Matric Water And Related Physiological Properties, Hussain Ali Al-Saadi

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Matric water was measured as the water retained by plant material on a pressure membrane or ultra filter after equilibration under 20 bars nitrogen gas pressure and the removal of free water. At increasing pressures lesser amounts of water are held by matric or colloidal surface forces. Twenty bars pressure, supplied by cylinder nitrogen for 48 hours, was used in this study. Matric water was expressed as a percent of either (a) the dry weight or (b) the original water content. Plant material was oven dried, ground, and then saturated with water prior to the determination.

The matric water values …

Viola Sororia Willd., John E. Ebinger

Specimens by Name

No abstract provided.

Viola Pubescens Var. Eriocarpa (Schwein.) N.H.Russell, Loy R. Phillippe

Specimens by Name

No abstract provided.

Viola Rafinesquii Greene, John E. Ebinger

Specimens by Name

No abstract provided.

Viola Rafinesquii Greene, Loy R. Phillippe

Specimens by Name

No abstract provided.

Claytonia Virginica L., Loy R. Phillippe

Specimens by Name

No abstract provided.

Front Matter, Vol. 16 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Understory Characteristics Related To Site Quality For Aspen In Utah, James H. Warner, Kimball T. Harper

Brigham Young University Science Bulletin, Biological Series

An analysis has been made of the basic ecology of aspen forests of the mountainous areas of Utah and northern Arizona. Forty-nine study areas have been examined in respect to density, height and age of the tree cover, tree reproduction, and composition and biomass production of the understory. A graphic model of interspecific assocations among prevalent understory species has been prepared by a cluster-analysis procedure based on presence and absence of species in 1,225 small quadrats (0.25 m²) uniformly distributed among the 49 stands. The model separates species of relatively stable as opposed to rapidly seral aspen forests. …

End Matter, Vol. 16 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

The Effects Of Moist-Heat Treatments And Stratification On Germination Of Prairie Plant Seeds, John E. Stuurwold

Honors Theses

Germination of Silphium terebinthenaceum was enhanced by a post-stratification most-heat treatment at 80°C. Tested seeds of four other perennial herbs common to midwestern prairies (Andropogon scoparius, Sorghastrum nutans, Eryngium yuccifolium, and Solidago rigida) showed little adverse or beneficial effects of the heat treatment. Heat treatments alone had little effect on the seeds; the length of stratification periods necessary to effect maximal germination varied. The significance of these findings is examined in the light of related literature on grassland fire ecology.

Plant Succession In The Great Dismal Swamp Of Virginia, Susan Woodward Walker

Biological Sciences Theses & Dissertations

Vegetational composition and environmental parameters were analyzed. for 14 stands. Cluster diagrams based on index of similarity values illustrated interstand relationships. The Index of Fluctuation was developed for the analysis of intrastand dynamics. Based on the densities and numbers of species of trees and saplings within a stand, it indicated degree of compositional stability. It was concluded that present vegetation is divided into relatively distinct communities which have resulted, at least in part, from disturbance.

Claytonia Virginica L., Loy R. Phillippe

Specimens by Name

No abstract provided.

Parthenocissus Quinquefolia (L.) Planch., Roger T. Poole

Specimens by Name

No abstract provided.