منابع مشابه
Sex Chromosomes: Evolution of the Weird and Wonderful
New findings in the platypus and Drosophila pseudoobscura illustrate, yet again, that the sex chromosomes seem never to stop evolving. Degeneration processes lead to a continual loss of genes and gene activity on the Y chromosome, and complete loss of Y-linked genes is possible if autosomal genes take over control of male fertility - though addition of new material to the sex chromosomes may st...
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Introduction. Unlike most of the seminars this term, my talk does not contain anything new, or even any of my own work. I chose the topic of octonions as I thought it would be a topic that few people knew about, but after I’ve been here a few months I find that there are several experts in the subject here. As far as I can tell, they tend to use real (or complex) octonions as a way of studying ...
متن کاملAutomorphisms of Wonderful Varieties
Let G be a complex semisimple linear algebraic group, and X a wonderful G-variety. We determine the connected automorphism group Aut(X) and we calculate Luna’s invariants of X under its action.
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W ith the increased dependence on networks and the near ubiquitous availability of the Internet, there is a new paradigm in place for the proliferation of spyware, viruses, and other malware. In fact, much attention has been given to spyware in popular literature with reports from multiple sources indicating that spyware has perhaps reached 90% home user PCs [2]. There is reason to believe this...
متن کاملWonderful Mira.
Since being named 'wonderful' in the seventeenth century for its peculiar brightness variability, Mira A has been the subject of extensive research and become the prototype for a whole class of 'Mira' variable stars. The primary star in a binary system, Mira A is reaching the end of its life and currently undergoing an extended period of enhanced mass loss. Recent observations have revealed a s...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1906
ISSN: 0036-8733
DOI: 10.1038/scientificamerican12081906-428