Cytotox ic T-cel ls were derived from the per i toneal cavity of a C 5 7 B L / 6 mouse immunized with B A L B / c sarcoma Meth A and from the sp leens of B A L B / c x C 5 7 B L / 6 F1 (hereaf ter cal led CB6F1) mice immunized with B A L B / c leukemia R L ~ I . The cel ls were cu l tured in inter leukin 2 and c loned by limiting di lut ion, and their speci f ic i ty was determined by d i rect ...

I used a host-visitor modeling framework to examine the interaction between the treehopper Publilia conca6a and ants in the genus Formica. In particular, I tested the functional relationship between ant tending, the spatial distribution of treehoppers, and treehopper density. The per-capita density of ants at each host plant was a decreasing function of treehopper density, distance from the ant...

Strong effects of predator chemical cues on prey are common in aquatic and marine ecosystems, but are thought to be rare in terrestrial systems and specifically for arthropods. For ants, herbivores are hypothesized to eavesdrop on ant chemical communication and thereby avoid predation or confrontation. Here I tested the effect of ant chemical cues on herbivore choice and herbivory. Using Margar...

A method has been described whereby tuberculin P P D is linked to formalinized erythrocytes by a coupling agent, tetrazotized benzidine (1). These antigen-coated erythrocytes are agglutinated by ant ibody to PPD. I t was observed that P P D could inhibit the hemagglutination more effectively than could polysaccharide I. I t appears, therefore, tha t the ant ibody concerned is directed toward th...

Ant-Q is an algorithm belonging to the class of ant colony based methods, that is, of combinatorial optimization methods in which a set of simple agents, called ants, cooperate to find good solutions to combinatorial optimization problems. The main focus of this article is on the experimental study of the sensitivity of the Ant-Q algorithm to its parameters and on the investigation of synergist...

Audio, animations and video belong to a class of data known as delay sensitive because they are sensitive to delays in presentation to the users. Also, because of huge data in such items, disk is an important device in managing them. In order to have an acceptable presentation, disk requests deadlines must be met, and a real-time scheduling approach should be used to guarantee the timing requir...

T h e cell surface F9 ant igens are def ined by the 129/Sv an t i -F9 serum (1), a syngeneic an t i se rum raised agains t i r r ad ia t ed cells of the mur ine F9 e m b r y o n a l ca rc inoma (E.C.) 1 line (2). T h r o u g h c o m p l e m e n t m e d i a t e d cytotoxic i ty or indirect immunof luorescence (IF) tests, the F9 ant igens a p p e a r to be cell surface ant igens character is t ic...

Ant-Q is an algorithm belonging to the class of ant colony based methods, that is, of combinatorial optimization methods in which a set of simple agents, called ants, cooperate to find good solutions to combinatorial optimization problems. The main focus of this article is on the experimental study of the sensitivity of the Ant-Q algorithm to its parameters and on the investigation of synergist...