Thesis (Ph. D.)--Ohio State University, 2005. / Title from first page of PDF file. Document formatted into pages; contains xv, 107 p.; also includes graphics (some col.) Includes bibliographical references (p. 97-107). Available online via OhioLINK's ETD Center

Thesis (M.S.)--Marshall University, 2008. / Title from document title page. Includes abstract. Document formatted into pages: contains vii, 96 p. : col. ill. Includes bibliographical references.

Thesis (M.Sc.)-Marshall University, 2008. / Title from document title page. Includes abstract. Document formatted into pages: contains 54p. Includes bibliographical references (p. 48-50).

Thesis--University of Michigan. / Caption title. From Proceedings of the Iowa Academy of Science, v. 51, 1944. "Literature cited": p. 434-435.

This study was conducted to determine the influence of age and culture on the fear of snakes. Five age groups, consisting of 20 White and 20 Xhosa subjects each, were tested. In addition to a behavioural and a GSR measure of fear, questionnaires were applied to determine the extent of the subjects' personal and vicarious aversive experiences of snakes and attitudes towards snakes. The behavioural measure showed a significant decrease in the fear of snakes between the 9 - 11 year and the 14 - 16 year White groups, while, for the Xhosa subjects, the fear of snakes increased significantly between the age groups 14 - 16 years and 18 - 20 years. The GSR measure showed a consistent level in the fear of snakes for White subjects. For the Xhosa subjects the mean GSR score for the 18 - 20 year .group was considerably higher than the means for the other age groups. The intensity of the fear of snakes for White and Xhosa subjects of the same age was remarkably similar. Xhosa subjects had significantly more negative attitudes towards snakes than white subjects. This finding was explained in terms of Whites having had greater opportunities to obtain factual information about snakes. No significant relationships were found between (a) the measures of the extent of the subjects' aversive experiences of snakes; (b) the degree of negative attitudes towards snakes; and the measures of the fear of snakes. On the basis of these measures, the etiology of the fear of snakes cannot be explained in terms of aversive experiences with snakes per se. The striking similarity of responses to a live snake by subjects from two widely different cultures suggests caution in an over-hasty dismissal of the theory of an innate fear of snakes.

No description available.

Thesis (Ph. D.)--Lehigh University, 2003. / Includes vita. Includes bibliographical references (leaves 147-160).

Thesis (Ph.D.) - Carleton University, 2002. / Includes bibliographical references (p. 172-190). Also available in electronic format on the Internet.

Thesis (M.S.)--Missouri State University, 2008. / "August 2008" Includes bibliographical references (leaves 23-27). Also available online.

School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, 2017 / Snakes have often been proposed as ideal model organisms for studying digestive physiology. This is due to their easily–measureable and extreme changes in their digestive tracts in response to feeding, when compared to other vertebrates. Some species display extreme physiology regulation in response to feeding, a system known as digestive down-regulation. This regulation allows them to down-regulate their digestive tracts during their long fasting periods, which allows them to save energy. In response to feeding, they up-regulate their digestive tracts to a functional level, resulting in a significant increase in the size of the digestive organs during digestion. These changes have been found to be most noticeable in certain ambush foraging snakes. In contrast, actively foraging snakes appear to not display as extreme changes in response to feeding and keep their digestive tracts in a constant state of readiness. However it is not known if this pattern exists in all species and previous methods of classifying the digestive physiology have proven to be expensive, difficult and time consuming. My study aimed to investigate if museum specimens could be used as a cheap and quick method of classifying the characteristics of the digestive physiology within a species. I measured the dimensions of several organs from museum specimens from 13 species of southern African snakes, as well as recorded the relative size of the meal and month of capture. I compared measurements between postprandial and fasting individuals from each species as well as between individuals from each species with the same feeding state to assess whether they were able to down-regulate their digestive systems when not digesting. While the different foraging strategies appeared to be linked to differences in organ morphology, the presence of down-regulation was not clear-cut. No significant differences in organ size between feeding states were found within each species, and very few significant differences were found between species. Few correlations with organ size to meal size or seasonality were found. This suggests that the museum specimens are not suitable for determining digestive physiology in snakes, probably due to the poor quality of the specimens. I therefore recommend the use of freshly obtained samples as a suitable comparison rather than the use of museum specimens. / MT2017