Influence of Volatile Degassing on Initial Flow Structure and Entrainment During Undersea Volcanic Fire Fountaining Eruptions

Release of dissolved volatiles during submarine fire fountaining eruptions can profoundly influence the buoyancy flux at the vent. Theoretical considerations indicate that in some cases buoyant magma can be erupted prior to fragmentation (~75% vesicle volume threshold). Laboratory simulations using immiscible fluids of contrasting density indicate that the structure of the source flow at the vent depends critically on the relative magnitudes of buoyancy and momentum fluxes as reflected in the Richardson number (Ri). Analogue laboratory experiments of buoyant discharges demonstrate a variety of complex flow structures with the potential for greatly enhanced entrainment of surrounding seawater. Such conditions are likely to favor a positive feedback between phreatomagmatic explosions and volatile degassing that will contribute to explosive volcanism. The value of the Richardson number for any set of eruption parameters (magma discharge rate and volatile content) will depend on water depth as a result of the extent to which the exsolved volatile components can expand

Crime and Punishment in Gold Country : A Historical Case-Study

Rural life, small town life, is not and has never been idyllic. It has always had its share of pathology, sometimes deep pathology. Small town life is not necessarily traditional life, close-knit family life, neighborly life. That kind of life certainly exists; but America was never a traditional society in that sense. Its small towns were full of strangers. The population of El Dorado County, small as it was, had been growing rapidly. Like America in general, El Dorado County had its share of anomie; rootless men (and women), without strong relationships: ships without anchors, driftwood on the sea of society. Most of the defendants had families, but (apparently) not successful families. Life was a steady downward slide. Some defendants, perhaps, would eventually be able to patch together a reasonably successful life. For some, their brush with the law might even have been at least mildly deterrent or therapeutic. Teaching a lesson is, after all, one of the goals of criminal justice. How often this happens is a question these files cannot answer. The chronicles revealed in the files of El Dorado County are on the whole chronicles of wasted lives, chronicles of chronic and dismal failure

Interleukin 1 production during accessory cell-dependent mitogenesis of T lymphocytes

We have studied the control and significance of IL-1 production in human leukocyte cultures during accessory cell-dependent, T lymphocyte mitogenesis using sensitive bioassays and immunolabeling techniques. In primary antigen-dependent systems like the MLR, IL-1 production was not detected in accessory cells (monocytes, dendritic cells) or T cells, suggesting that it is not an early product in these responses. However, monocytes could be induced to make IL-1 after interacting with sensitized antigen-specific T cells. Both alloreactive T cell clones or freshly prepared lymphoblasts induced IL-1 provided the monocytes carried the HLA-DR antigens to which the T cells were initially sensitized. Even in these circumstances, dendritic cells and B cells failed to make IL-1. The mechanism whereby activated T cells induce IL-1 in monocytes was explored. Supernatants from cocultures of monocytes and T cells or several recombinant cytokines induced little or no IL-1. A more potent antigen independent pathway of IL-1 induction was identified. IL-1 could be induced in third-party HLA-DR nonspecific monocytes in cocultures of alloreactive T cell clones or blasts and HLA-DRE-specific dendritic cells. The induction was factor independent since dendritic cells and T blasts placed in a chamber separate from third-party monocytes by a semipermeable membrane did not induce monocyte IL-1. These results suggest that a cell contact mechanism rather than an IL-1-inducing factor leads to IL-1 production. The role of IL-1 in T cell proliferation was tested with a polyclonal anti-IL-1 antibody. The antibody failed to block the proliferation of primary T cells, or alloreactive T cell clones and blasts stimulated with HLA-specific monocytes or dendritic cells, even though IL-1 in the medium was neutralized

Carbonate-Clastic Synthems of the Middle Beekmantown Group in the Central and Southern Champlain Valley

Guidebook for field trips in Vermont: New England Intercollegiate Geological Conference, 79th annual meeting, October 16, 17 and 18, 1987: Trips C-4. Irregular pagination