• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 108
  • 64
  • 17
  • 8
  • 5
  • 3
  • 2
  • 2
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 246
  • 66
  • 50
  • 50
  • 40
  • 26
  • 26
  • 24
  • 22
  • 20
  • 19
  • 19
  • 18
  • 17
  • 16
  • 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.
31

Rocky Mountain spotted fever

Rucker, William Colby. January 1912 (has links)
Thesis (M.S.)--University of Calif. 1912. / Reprint from the Public health reports, vol. XXVII, no. 36, Sept. 6, 1912. This paper originally appeared in the Military surgeon, vol. XXIX, no. 6, Dec. 1911, p. 631-657, under title, "The problem of Rocky Mountain spotted fever." As republished here the text and bibliography have been amended so as to cover the subject to the present time. cf. p. 3. Bibliography: p. 23-29.
32

Attractivity of plant volatiles and a semichemical-based bait to the western spotted cucumber beetle, Diabrotica undecimpunctata Mannerheim (Coleoptera: Chrysomelidae)

Hongtrakul, Tawatchai 02 December 1997 (has links)
The adult western spotted cucumber beetle (WSCB), Diabrotica undecimpunctata undecimpunctata Mannerheim is considered a major pest of snap beans grown for processing in Western Oregon. Control consists of 1 or 2 insecticide sprays prior to harvest. A commercial semiochemical-based insecticide bait, Adios TIC��, 1.3% carbaryl + 5% buffalo gourd root powder + 0.7% TIC mixture (1,2,4-trimethoxybenzene, indole, and trans-cinnamaldehyde, 1:1:1), was evaluated for the control of WSCB in commercial snap beans. Adios TIC�� did not result in improved WSCB control as reflected by number of beetles and pod damage. Twenty one plant volatile compounds were evaluated for their attractivity to WSCB in snap bean and squash fields by comparing the number of beetles caught on sticky traps in 1 to 3 day periods. The chemicals beta-ionone, benzyl alcohol, and indole consistently attracted significantly more beetles than unbaited traps. An equal part of these chemicals caught more WSCB than those baited with any of the two component mixture blends or even individual components. Captures of WSCB increased significantly as doses of the 1Bb mixture in trap increased. Baited traps placed inside and at the edge of alfalfa fields caught similar numbers of WSCB. More WSCB were caught on traps inside than outside fields. Traps baited with the 1Bb mixture placed at canopy level or at 10-15 cm above canopy caught equal numbers of WSCB. Traps below plant canopy caught fewer WSCB. Most WSCB were caught from 10:00 to 13:00 hrs and from 16:00 to 18:00 hrs. Fresh preparations of IBb were the most attractive to the beetle. The majority of WSCB attracted by the IBb mixture were males (���80%). Its individual components, indole and benzyl alcohol attracted mostly females (���73% and 70% respectively), beta-ionone attracted mostly males (���80%). / Graduation date: 1998
33

An ecological study of the spotted salamander, Ambystoma maculatum, and Jefferson salamander, A. jeffersonianum, in West Virginia

Myers, Seth J. January 2003 (has links)
Thesis (M.S.)--Marshall University, 2003. / Title from document title page. Document formatted into pages; contains viii, 111 p. including illustrations. Includes vita. Includes bibliographical references (p. 35-38).
34

EVOLUTIONARY RELATIONSHIPS OF THE TOADS OF THE BUFO PUNCTATUS GROUP

Ferguson, J. Homer January 1964 (has links)
No description available.
35

Sequential cattle and sheep grazing for Spotted Knapweed control

Henderson, Stacee Lyn. January 2008 (has links) (PDF)
Thesis (MS)--Montana State University--Bozeman, 2008. / Typescript. Chairperson, Graduate Committee: Rodney W. Kott Includes bibliographical references.
36

Restoration of spotted knapweed infested grasslands in Glacier National Park

Stringer, Lewis Tipton. January 2003 (has links) (PDF)
Thesis (M.S.)--Montana State University, 2003. / Title from PDF title page (viewed Jan. 6, 2005). Includes bibliographical references (p. 56-63).
37

Scent marking in a highly social mammalian species, the spotted hyena, Crocuta crocuta

Theis, Kevin Robert. January 2008 (has links)
Thesis (PH.D.)--Michigan State University. Zoology and Ecology, Evolutionary Biology and Behavior, 2008. / Title from PDF t.p. (viewed on Aug. 11, 2009) Includes bibliographical references (p. 156-178). Also issued in print.
38

Land cover at northern spotted owl nest and non-nest sites, east-central Coast Ranges, Oregon /

Perkins, John P. January 1900 (has links)
Thesis (M.S.)--Oregon State University, 2001. / Typescript (photocopy). Includes bibliographical references (leaves 71-76). Also available on the World Wide Web.
39

The Development of Synchronous Vocalizations and Behaviors in Juvenile Male Wild Atlantic Spotted Dolphins

Unknown Date (has links)
The ability of adult wild Atlantic spotted dolphins (Stenella frontalis) to synchronize vocalizations and behaviors has been found to be a key factor in overcoming much larger bottlenose dolphins during interspecies aggression (Cusick & Herzing, 2014). Furthermore, an adult baseline of behaviors and vocalizations during aggressive events containing synchrony has been established (Myers, Herzing, & Bjorklund, 2017). The present study examines juvenile aggression that contains bouts of synchrony to look at the development of this valuable skill. Differences of duration between adult and juvenile synchronous bouts, lag sequential analyses, frequencies of behavioral classes depending on the age class of the aggressor-recipient dynamic, differences in the frequencies of behavioral classes depending on the synchronous state and aggressorrecipient dynamic, and differences in behavioral classes exhibited by adults and juveniles during different synchronous states were analyzed. Adults, across group size, were able to maintain physical synchrony for a longer duration. Juveniles were often in loose synchronous groups before forming into a tight synchronous group as seen in adult synchrony. Vocal synchrony during adult aggression in terms of synchronized squawks were longer in duration than vocal synchrony during juvenile aggression. Juveniles used more pursuit behaviors during aggression, which indicates practice of a behavior that was found to be the most frequently used in interspecies aggression (Volker, 2016). Additionally, when adults were present in juvenile aggression, they used fewer aggressive behavioral classes demonstrating self-handicapping based on their opponent. This illustrates that there is a learning period for both vocal and physical synchrony for juvenile dolphins and that juvenile aggression, or play-fighting, is an important aspect of the development of these skills. This study is the first to describe juvenile synchrony in a population of wild Atlantic spotted dolphins. / Includes bibliography. / Dissertation (Ph.D.)--Florida Atlantic University, 2018. / FAU Electronic Theses and Dissertations Collection
40

No simple tradeoffs Centaurea plants from America are better competitors and defenders than plants from the native range /

Ridenour, Wendy L. January 2006 (has links)
Thesis (Ph. D.)--University of Montana, 2007. / Title from title screen. Description based on contents viewed Oct. 9, 2008. Includes bibliographical references.

Page generated in 0.0466 seconds