A retrovirus endogenous to guinea pig cells was earlier shown to be morphologically similar to type B and type D prototype retroviruses. Molecular hybridization techniques were used to show that guinea pig virus nucleotide sequences are endogenous to both domestic (Cavia porcellus) and indigenous (Cavia aperea) guinea pigs, but cannot be detected in the DNA of either other hystricomorph rodents...

The guinea pig sperm surface protein PH-20 has an essential function in sperm adhesion to the zona pellucida of guinea pig eggs. Fully effective contraception has been achieved by immunizing either male or female guinea pigs with purified guinea pig PH-20. Here we report the isolation of human and cynomolgus monkey PH-20 cDNAs as a key step toward testing the function of primate PH-20 and the c...

Guinea pig insulin exhibits an unusually high degree of divergence from the conserved insulins of other mammals. cDNA clones encoding guinea pig preproinsulin were isolated, and their nucleic acid sequences were determined. Comparisons of the nucleic acid sequence and its predicted amino acid sequence with sequences encoding insulins of other species revealed that the gene encoding guinea pig p...

1.1 We prove that: Over any field I of characteristic p > 0, there exists an infinite dimensional Lie algebra which is the join of two (p + l)-dimensional and nilpotent (of class exactly p) subideals. A result of Hartley ([2; p. 259, theorems 2 and 5]) states that over any field of characteristic zero, the join of a pair of finite dimensional (resp. finite dimensional and nilpotent) subideals i...

The papers in this volume of Frontiers all relate to 3D vision. What, then, is a paper about visual stability doing among them? I will argue that these topics are really two sides of the same coin: if we are not to be surprised by the changes in images that occur as we move (we see a stable world), we must have some sort of representation of the 3D environment that has given rise to those image...

A sensory evaluation study was performed at UC Davis to determine if taste differences could be detected among several English walnut (Juglans regia) cultivars. Differences were tested using the duo-trio method, in which 'Hartley' was compared to seven other cultivars. No differences were found when 'Hartley' was compared to 'Vina', 'Scharsch Franquette' and 'Mayette', however 'Chandler', 'Chic...

are potent carcinogens in several species of animals (33) but have induced no tumors in the guinea pig (1, 8, 22, 30). That this contrasting response might be reflected in the metabolism of these compounds has been the object of several studies. Meade and Ray (21) found more combined diazotizable and less free diazotizable material after an intraperitoneal injection of 2-fluorenamine than was o...

High titers of interferon were induced by the psittacosis agent in guinea pig leukocyte cultures. Optimal yields of interferon were produced from freshly prepared guinea pig leukocyte cultures containing 4 x 106 cells per ml inoculated with a psittacosis/cell multiplicity of 1.0 and incubated at 35 C for 24 hr. Leukocytes obtained from 2to 4-month-old guinea pigs produced 20 times more interfer...