Proposed New Method for Separating Isotopes
RECENTLY1 a double mercury discharge vessel was used (Fig. 1), in which a large current running in the outer vessel irradiated the small current discharge in the inner vessel with 2537 Å resonance radiation. This irradiation caused the running voltage and electron temperature in the inner discharge to be reduced appreciably over the non-irradiated mode of operation. The explanation offered was that the neutral Hg atoms in the inner vessel absorbed the resonance radiation and entered the 63P1 state (see Fig. 2), and from this level the atom was ionized by electron impact. In addition the 63P0 and 63P2 metastable levels are populated from the 63P1 level by electron collisions and by cumulative absorption and radiative decay of higher levels. Because the radiation field is doing approximately half the ionization work, the electron temperature drops correspondingly.
The role of liver stromal cells in dendritic cells development in mice.
The inherent tolerogenicity of liver allografts may be due to tolerogenic dendritic cells (DC) therein. It is not clear whether the unique antigen-presenting function of liver DC is intrinsic or whether it is altered by microenvironmental factors in the liver. In the present study, we investigated the effect of hepatic stellate cells (HSC) on the development and function of DC propagated from bone marrow. DC exposed to HSC or HSC supernates expressed low CD11c, CD86, and major histocompatibility complex class II and elicited inferior allostimulatory function compared with conventional DC. These results suggested that soluble factor(s) secreted from HSC influence DC development.
New levels in the uranium spark spectrum (u ii)
Abstract On the basis of the known classification of the U II spectrum a systematical investigation has been made of several well known differences throughout the spectrum, in order to find the interconnection between the two groups of lines, already classified. Although we did not find the distance between the two lowest levels of the two groups, we succeeded in adding 17 levels to group A and 63 levels to group B. 392 lines have been added to the list of classified lines. So at present we know the classification of 743 lines in the U II spectrum, being 756 combinations between 8 odd and 24 even levels in group A and 16 odd and 115 even levels in group B . All levels and classified lines are given in this paper.