منابع مشابه
On the gap between separating words and separating their reversals
A deterministic finite automaton (DFA) separates two strings w and x if it accepts w and rejects x. The minimum number of states required for a DFA to separate w and x is denoted by sep(w, x). The present paper shows that the difference ∣∣sep(w, x)− sep(w, xR)∣∣ is unbounded for a binary alphabet; here w stands for the mirror image of w. This solves an open problem stated in [Demaine, Eisenstat...
متن کاملPositioning the Golgi Apparatus
Ríos et al. (2004) report in this issue that the Golgi protein GMAP-210 is sufficient to confer pericentrosomal positioning and recruits gamma-tubulin and associated microtubule-nucleating ring complex proteins to Golgi membranes. The results raise the possibility that short microtubules emanate from the Golgi to mediate its organization and positioning.
متن کاملThe Golgi apparatus
At some point in their lives all cells need to grow and divide. In eukaryotic cells these processes require the delivery of new proteins and lipids from their site of synthesis in the endoplasmic reticulum (ER) to the cell surface. The Golgi apparatus, first visualised under the light microscope in 1898 by Camillo Golgi using a staining method he had developed to study neurons, lies on the rout...
متن کاملThe Mitotic Apparatus
Mitotic apparatuses (MA) isolated from metaphase sea urchin eggs in 12% hexylene glycol at pH 6.4 can be dissolved rapidly in 0.6 M KCl, and more than one-half of the total protein of the MA is soluble under these conditions. In the phase-contrast microscope, the fibrous structure of the MA can be seen to disintegrate in KCl solution, leaving only granular material which, in the electron micros...
متن کاملThe DAMA/LIBRA apparatus
The ≃ 250 kg highly radiopure NaI(Tl) DAMA/LIBRA apparatus, running at the Gran Sasso National Laboratory (LNGS) of the I.N.F.N., is described.
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ژورنال
عنوان ژورنال: Science
سال: 1896
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.3.76.857