Life Sciences Commons^™

Studies On Bucephalid Cercaria Including A New Species From The Dillon Beach Area, Donald Edward Giles

University of the Pacific Theses and Dissertations

The family Bucephalidae is unique in the class Trematoda by virtue of the mouth being situated near the mid-ventral portion of the body. Other characteristics of the family include: haptor near the anterior extremity; a simple, sac-like gut with pharynx and esophagus; genital pore ventral, just anterior to the posterior extremity; gonads posterior and vitellaria species live in the gut of marine and fresh-water fishes. The metacercariae are found encysted beneath the skin or in the nervous system of other fishes serving as second intermediate hosts. Sporocysts and cercariae have been recovered from a variety of lamellibranchs.

A generalized life …

Some Observations On Oral Protozoa Of Man, Howard Edwin Runion

University of the Pacific Theses and Dissertations

This investigation is based upon the occurrence of oral protozoans among 25 periodontalclasial patients in Stockton, California. It is concerned, in part, with the correlation of infections with age, sex and oral health of the host and, in part, with culture techniques. The specific cultivation of Trichomonas tenax was explored in an effort to employ an improved experimental medium.

Trichomonas tenax and Endamoeba gingivalis are the only protozoans known to occur commonly in the human mouth. Distribution is cosmopolitan and there are no known endemic areas. Incidence of these two protozoans, among periodontalclasial patients, has not been reported since the …

Ascidicolous Copepods Of Dillon Beach, California, David Horace Montgomery

University of the Pacific Theses and Dissertations

Work on the copepoda parasitizing anoidiens has been relatively extensive in Europe, loss so on the East Coast of the United States and negligible on the West Coast. of this work, a major portion has been concerned with the solitary ascidians, while the colonial or compound forms have been largely neglected. The apparent lack of interest in copepods parasitizing compound be attributed to the manliness of the animals, their associations with both Zooids and the colonial matrix which makes dissection difficult and the chaotic condition of their taxonomy.

Tannin Content Of English Walnuts : Thesis ..., Joseph G. Natoli

University of the Pacific Theses and Dissertations

Present methods for the production of leather from animal hides still depend from the most part on the use of natural tannin extracts. During the year, 1952, the amount of natural tannin extracts used by the leather industry was 560,452,119 pounds as compared to 35,793,000 pounds of synthetic tanning materials. It is not as yet possible to produce synthetic materials as economically as the natural extracts; the result being that there is still a very great demand for natural tannin extracts. The need for finding new domestic sources of tannins is apparent when the amounts of domestic and imported extracts …