Triple mode Cepheid masses

Unconventional composition structures are proposed to explain the periods of the triple mode Cepheid aC And. A strong Cepheid wind appears to enrich helium in the convection zones down to about 60,000 K or 70,000 K. Then some downward partial mixing occurs to the bottom of a layer with about 1-q = .0005 of the stellar mass. It was found that AC And was not unlike anomalous Cepheids. However, masses of betwen one and two solar masses are suggested and the population is more likely a type two

Receipt from N. T. Hodson to Ogden Goelet

https://digitalcommons.salve.edu/ochre-court/1141/thumbnail.jp

Letter from N. T. Hodson to Ogden Goelet

https://digitalcommons.salve.edu/ochre-court/1135/thumbnail.jp

Invoice from N.T. Hodson to Ogden Goelet, May 24 to June 8

https://digitalcommons.salve.edu/ochre-court/1147/thumbnail.jp

Invoice from N.T. Hodson to Ogden Goelet, June 1 to 3

https://digitalcommons.salve.edu/ochre-court/1155/thumbnail.jp

Invoice from N.T. Hodson to Ogden Goelet, May 24

https://digitalcommons.salve.edu/ochre-court/1154/thumbnail.jp

Letter from N.T. Hodson to John Yale

https://digitalcommons.salve.edu/ochre-court/1138/thumbnail.jp

Contract between N. T. Hodson and Ogden Goelet

https://digitalcommons.salve.edu/ochre-court/1145/thumbnail.jp

Crystallization of calcite from amorphous calcium carbonate: earthworms show the way

No abstract available

Copper Toxicity in Erwinia amylovora : An X-Ray Microanalytical Study

The effect of Cu2+ ions on the growth and elemental composition of the phytopathogenic bacterium Erwinia amylovora was investigated by in vitro culture in nutrient broth supplemented with CuSO4. No detectable inhibition in bacterial growth occurred with medium supplemented at 10-4M Cu (compared to control medium with no added Cu), but partial inhibition occurred at 10-3M Cu (limiting toxicity) and complete inhibition at 10-2M Cu. Under conditions of limiting toxicity, incubation in Cu2+ ions leads to a reduction in the general synthesis of cell materials and the formation of abnormally large cells with a small dry mass. X-ray analysis revealed the uptake of small levels of Cu2+ under these conditions, plus wide-ranging changes in other major elements present in the bacterial cells. These changes included a reduction in the level of K and increased levels of the divalent cations Ca and Fe. The results obtained are consistent with the toxic effect of Cu being mediated via its effect on the cell membrane, with internal elemental changes resulting from a perturbation of membrane permeability