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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Studies of natural products from Liriodendron tulipifera, Simmondsia californica and hardwood bark compost.

Wilton, John Howard January 1982 (has links)
No description available.
12

The impact of tuliptree scale feeding on its host, yellow-poplar /

Burns, Denver Peeper January 1967 (has links)
No description available.
13

Assessment of Genetic Variation of Acer rubrum L. and Liriodendron tulipifera L. Populations in Unmanaged Forests of the Southeast United States

Kovach, Katherine Elizabeth 30 March 2009 (has links)
Acer rubrum L. and Liriodendron tulipifera L. are prolific throughout their ranges in the Southeastern U.S. and also have increasingly important roles in forestry and wood products in this region. The relatively low density and intermediate strength of the wood makes them versatile for use in many different wood products. Exploring the genetic structure of these species could provide a foundation for further genetic and breeding exploration with these economically important trees. This study utilizes amplified fragment length polymorphism to determine the level of genetic diversity of these species in contrasting physiographic provinces. AFLP was performed using five primer combinations on samples collected from six unmanaged populations of each species in the Mountains and Coastal Plain of the Southeastern U.S. Wood density was determined using an X-ray densitometer. A. rubrum lacked strong genetic structure while L. tulipifera showed differentiation between physiographic provinces. Genetic diversity of A. rubrum was lower within the Mountain populations (He: 0.327) than the Coastal Plain populations (He: 0.365). The average wood density for A. rubrum is lower in the Mountains (539.00 kg/m^3) than in the Coastal Plain (575.43 kg/m^3). Genetic diversity of L. tulipifera was higher overall (He: 0.289) than within the Mountain populations (He: 0.281) or the Coastal Plain populations (He: 0.271). The average wood density for L. tulipifera is greater in the Mountains (445.45 kg/m^3) than in the Coastal Plain (441.67 kg/m^3). / Master of Science
14

The effects of fertilization and release on growth, physiology, nutrition, and sapwood quality of young yellow-poplar

Bollig, John Joseph 11 July 2009 (has links)
The effects of crop tree release and fertilization of young yellow-poplar on low and medium quality Southern Appalachian sites were compared. In June of 1989 96 individual 10 year-old yellow-poplar crop stems were treated in factorial combinations. The crop trees were either released, using a 4% triclopyr ester in kerosene basal spray. fertilized with 224, 291 and 243 kg/ha of N, P, and K; released and fertilized, or left untreated. These treatments were repeated in June of 1992. In 1992, treatments were slightly different. Crop trees were released mechanically, and only nitrogen was applied at 224 kg/ha. After five years, only release resulted in significant growth responses. Released trees responded positively to increased sunlight and horizontal space by increasing their uptake of nitrogen and iron - elements essential for photosynthesis. This led to an increase in foliage production, and presumably, an increase in total photosynthesis. Released trees reacted to the increased growing space by filling in the space created by release. Released trees increased both diameter and crown volume growth; unfortunately, they did so at the expense of height growth, which was decreased by crop tree release. Current stem wood volume, was therefore not increased. / Master of Science
15

Microbial ecology of freshly sawn yellow-poplar lumber (Liriodendron tulipifera L.) in two seasons

Mikluscak, Mark R. January 2002 (has links)
Thesis (M.S.)--West Virginia University, 2002. / Title from document title page. Document formatted into pages; contains xi, 138 p. : ill. (some col.). Includes abstract. Includes bibliographical references.
16

Inter- and intraspecific variation of stemflow production from Fagus grandifolia and Liriodendron tulipifera effects of bark microrelief & meteorological conditions /

Stan, John Toland van. January 2009 (has links)
Thesis (M.A.)--University of Delaware, 2008. / Principal faculty advisor: Delphis F. Levia, Dept. of Geography. Includes bibliographical references.
17

Alkaloidy dřeva druhu Liriodendron tulipifera L. a jejich aktivita vůči lidským cholinesterasam / Alkaloids from the wood of the species Liriodendron tulipifera L. and their activity against human cholinesterases

Hrušková, Magda January 2018 (has links)
Hrušková M.: Alkaloids from the wood of the species Liriodendron tulipifera L. and their activity against human cholinesterase. Diploma thesis, Charles University, Faculty of Pharmacy in Hradec Králové, Department of Pharmaceutical Botany, Hradec Králové, 2018. Key words: Liriodendron tulipifera, alkaloids, biological activity. The alkaloids from the wood of the species Liriodendron tulipifera L. were isolated and their inhibitory activity against acetylcholinesterase, butyrylcholinesterase and propyl oligopeptidase, which are enzymes involved in the pathophysiology of Alzheimer's disease (AD), was investigated. The search and testing of new substances, which are used in AD treatment, is very relevant, as this disease cannot be casually treated yet. An alkaloid extract of Liriodendron tulipifera L. wood was tested in a preliminary testing for inhibitory activity against human cholinesterase. Because of the promising results, it was chosen for an isolation and identification of possible effective alkaloids. The extract was carried out by column chromatography with a step gradient elution. A preparative TLC was used to isolate alkaloids. The identification of alkaloids was done by structural analyses (NMR and MS). Optically active substances were measured for their optical rotation. A modified...
18

Structural studies of natural products of Liriodendron tulipifera and Amphiachyris dracunculoides : I. Sesquiterpene lactones of Liriodendron tulipifera. II. Diterpene lactones of Amphiachyris dracunculoides /

Harraz, Fathalla Mohamed January 1984 (has links)
No description available.
19

Structural studies of selected secondary metabolites.

Fairchild, Edward Harold January 1976 (has links)
No description available.
20

Translocation of diquat in the tuliptree (Liriodendron tulipifera, L.)

Sproat, James M. 03 June 2011 (has links)
Foliar application of the phytotoxic herbicide diquat dibromide was made to twenty tuliptree seedlings actively growing under field conditions on October 6, 1973, at the Purdue Davis farm in Randolph County, Indiana. Herbicidal extraction was accomplished by two extraction procedures: Langlois, et. al., (1963), and a method described in the Pesticide Analytical Manual (9/1/67). Herbicidal application methods utilized two concentrations and three time periods for translocation to occur.Results from the herbicidal application to the tuliptree seedlings indicate that diquat dibromide is present in all parts of the seedling trees within a two hour time period, and that relative amounts of diquat per plant organ are time dependent.Ball State UniversityMuncie, IN 47306

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