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Solar-cycle variation of the daily foF2 and M(3000)F2 (1998)

Kouris, S. S. ; Bradley, P. A. ; Dominici, P.

Springer

Annales geophysicae 16 (1998), S. 1039-1042

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ISSN: 0992-7689

Keywords: Electromagnetics (Guided waves) ; Ionosphere (Ionospheric disturbances) ; Radio Science (Radio wave propagation)

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Abstract Daily values of the ionospheric characteristics foF2 and M(3000)F2 for a given hour and month are correlated with the corresponding daily values of sunspot number using measured data collected at seven European locations. The significance of applying different-order polynomials is considered and the times are confirmed when the higher-order terms are important. Mean correlation coefficients for combined data sets over all hours, months and stations are determined, together with the standard errors of estimates. Comparisons are made with corresponding figures for monthly median values derived from the same data sets.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s00585-998-1039-0

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Preliminary X-ray analysis of a new crystal form of recombinant pig kidney DOPA decarboxylase (1999)

Malashkevich, V. N. ; Burkhard, P. ; Dominici, P. ; [et al.]

Copenhagen : International Union of Crystallography (IUCr)

Acta crystallographica 55 (1999), S. 568-570

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ISSN: 1399-0047

Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Topics: Chemistry and Pharmacology , Geosciences , Physics

Notes: DOPA decarboxylase is responsible for the synthesis of the key neurotransmitters dopamine and serotonin via decarboxylation of L-3,4-dihydroxyphenylalanine (L-DOPA) and L-5-hydroxytryptophan, respectively. The crystals of recombinant DOPA decarboxylase differ from those previously reported for the enzyme purified from pig kidney. They belong to space group P622 with unit-cell dimensions a = b = 302.6, c = 178.1 Å. Both the self-rotation function and the good diffraction quality of these crystals (2.5 Å on a synchrotron source) suggest that there should be at least three protein dimers in the asymmetric unit. Diffraction data sets have been collected for the native enzyme and a heavy-atom derivative.