منابع مشابه
Nuclear sizes and ground states
1 Nuclear dimensions 2 Nuclear size may be probed with scattering experiments, such as Rutherford's bombardment of a gold foil with alpha-particles which established the nuclear model of the atom, or electron scattering. Bombarding particles must have de Broglie wavelengths (given by p = h= ̧) smaller than the nuclear size of a few fm to actually probe the nuclear structure; this requires p ̧ 10¡...
متن کاملNuclear Sizes and the Isotope Shift
Darwin-Foldy nuclear-size corrections in electronic atoms and nuclear radii are discussed from the nuclear-physics perspective. Interpretation of precise isotope-shift measurements is formalism dependent, and care must be exercised in interpreting these results and those obtained from relativistic electron scattering from nuclei. We strongly advocate that the entire nuclear-charge operator be u...
متن کاملEffective population sizes and temporal stability of genetic structure in Rana pipiens, the northern leopard frog.
Although studies of population genetic structure are very common, whether genetic structure is stable over time has been assessed for very few taxa. The question of stability over time is particularly interesting for frogs because it is not clear to what extent frogs exist in dynamic metapopulations with frequent extinction and recolonization, or in stable patches at equilibrium between drift a...
متن کاملLA - UR - 97 - 2330 Nuclear Sizes and the Isotope Shift
Darwin-Foldy nuclear-size corrections in electronic atoms and nuclear radii are discussed from the nuclear-physics perspective. Interpretation of precise isotope-shift measurements is formalism dependent, and care must be exercised in interpreting these results and those obtained from relativistic electron scattering from nuclei. We strongly advocate that the entire nuclear-charge operator be u...
متن کاملCytoplasmic and nuclear Fos protein forms regulate resumption of spermatogenesis in the frog, Rana esculenta.
The role of Fos proteins in the regulation of germ cell progression during spermatogenesis has been studied in the frog, Rana esculenta. A peculiarity of this animal model is the finding of Fos in cytoplasmic compartment of primary spermatogonia during the resting period of the annual reproductive cycle. Interestingly, Fos is localized in the nuclear compartment when spermatogenesis resumes. Us...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 1959
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1538901