References of "1977"
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See detailEvolution of a low density H II region
Manfroid, Jean ULg

in Astronomy and Astrophysics (1977), 58

Abstract image available at: http://cdsads.u-strasbg.fr/abs/1977A&A....58..295M

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See detailLONNIE BROOKS Portrait/Interview
Sacré, Robert ULg

Article for general public (1977)

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See detailInteractions between beta-lactam antibiotics and isolated membranes of Streptococcus faecalis ATCC 9790
Coyette, Jacques; Ghuysen, Jean-Marie ULg; Binot, Françoise ULg et al

in European Journal of Biochemistry (1977), 75(1), 231-239

The DD-carboxypeptidase-exchange membrane-bound enzyme in Streptococcus faecalis ATCC 9790 reacts with beta-lactam antibiotics to form complexes with rather long half-lives. Depending upon the antibiotic ... [more ▼]

The DD-carboxypeptidase-exchange membrane-bound enzyme in Streptococcus faecalis ATCC 9790 reacts with beta-lactam antibiotics to form complexes with rather long half-lives. Depending upon the antibiotic, the second-order rate constants for complex formation range from 0.75-560 M-1 S-1 (at 37 degrees C and in water) and the first-order rate constants for complex breakdown range from 1.3 to 26 x 10(-5) s-1 (at 37 degrees C and in 5 mM phosphate buffer pH 7.5). There are about 30 pmol of DD-carboxypeptidase-exchange enzyme per mg of membrane protein. The degradation products arising from benzylpenicillin are phenylacetylglycine and probably N-formyl-D-penicillamine. Isolated membranes also contain other penicillin binding sites (about 70 pmol/mg membrane protein). That part of benzylpenicillin which reacts with at least some of these latter sites is slowly degraded into penicilloic acid. Normal functioning of the DD-carboxypeptidase-exchange membrane-bound enzyme is important, if not essential, for cell growth. With the beta-lactam antibiotics tested inhibition of cell growth is mainly related to the rates of formation of the inactive enzyme-antibiotic complexes. The relationship, however, is not a direct one probably due to the competitive effect exerted by the other penicillin binding sites. [less ▲]

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See detailThe exchange reaction of peptides R-D-alanyl-D-alanine with D-[14C]alanine to R-D-alanyl-D-[14C]alanine and D-alanine, catalysed by the membranes of Streptococcus faecalis ATCC 9790
Coyette, Jacques; Ghuysen, Jean-Marie ULg; Perkins, Harold R.

in European Journal of Biochemistry (1977), 75(1), 225-229

Under alkaline conditions, the membrane-bound DD-carboxypeptidase of Streptococcus faecalis ATCC 9790 catalyses exchange reactions in which the X-L-R3-D-Ala moiety of peptides of the type X-L-R3-D-Ala-D ... [more ▼]

Under alkaline conditions, the membrane-bound DD-carboxypeptidase of Streptococcus faecalis ATCC 9790 catalyses exchange reactions in which the X-L-R3-D-Ala moiety of peptides of the type X-L-R3-D-Ala-D-Ala is transferred to simple amino compounds such as D-alanine, glycine and glycyl-glycine. The enzyme system is unable, however, to catalyse complex reactions that would simulate the natural transpeptidation reaction. [less ▲]

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See detailPeriodicité d'etoiles Ap australes
Renson, Pierre ULg

in Information Bulletin on Variable Stars (1977), 1280

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See detailThe forbidden line spectrum in the edges of H II regions
Manfroid, Jean ULg

in Astrophysics & Space Science (1977), 48

It is shown analytically that the motion of exciting stars can affect the forbidden emission-line spectra of H II regions in an observable manner. A model is used which comprises a small solid angle of a ... [more ▼]

It is shown analytically that the motion of exciting stars can affect the forbidden emission-line spectra of H II regions in an observable manner. A model is used which comprises a small solid angle of a spherical nebula that is symmetric with respect to the direction of stellar motion and consists of a mixture of H, He, C, N, O, and Ne with ionization states up to He II, C III, N III, O III, and Ne III. Consideration is given to the case of a 36-solar-mass O5 star with an effective temperature of 43,000 K moving at a velocity of 10 km/s in a nebula having a density of 10 times the proton mass per cu cm. The results obtained indicate that: (1) the region where forbidden lines characteristic of ionization fronts are produced is broadened considerably at the trailing edge of the nebula; (2) the spectrum in this region is comparable to that of fossil H II regions; and (3) the ionization front at the leading edge is sharper, the temperature there is higher, and the forbidden-line spectrum is similar to that of young ionization fronts. [less ▲]

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See detailOn the Emission Spectrum of Orion
Manfroid, Jean ULg

in Astronomy and Astrophysics (1977), 57

Abstract image available at: http://cdsads.u-strasbg.fr/abs/1977A&A....57..303M

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See detailOrientation and structure of different components in the tail of comet West /1975n/
Surdej, Jean ULg; Surdej, Anna ULg

in Astronomy and Astrophysics (1977), 57

The orientation and structure of various components in the tail of comet West are studied from plates obtained March 4-11, 1976, with a 60-cm Schmidt telescope. A wavelike structure appears on March 10 ... [more ▼]

The orientation and structure of various components in the tail of comet West are studied from plates obtained March 4-11, 1976, with a 60-cm Schmidt telescope. A wavelike structure appears on March 10 and 11 in the type I tail. The mechanism for these waves is very probably excitation of surface waves in the ion tail due to Kelvin-Helmholtz instability at the interface between the comet plasma and the solar wind. According to this model, the measured wavelengths increase with distance from the comet head. The average wavelength of observed waves is 0.009 plus or - 0.002 AU. [less ▲]

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See detailRôle et Influence de Blind John Davis dans l'histoire du blues
Sacré, Robert ULg

Conference given outside the academic context (1977)

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See detailIonization fronts in RCW 107 (NGC 6164/5).
Danks, A. C.; Manfroid, Jean ULg

in Astronomy and Astrophysics (1977), 56

Abstract image available at: http://cdsads.u-strasbg.fr/abs/1977A&A....56..443D

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See detailPotassium effect on Na(+), K(+)-ATPase activity of cultured newborn rat astroblasts during differentiation.
Moonen, Gustave ULg; FRANCK, G.

in Neuroscience Letters (1977), 4(5), 263-7

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See detailMagnetic storm effects on the tropical ultraviolet airglow
Gérard, Jean-Claude ULg; Anderson, D. N.; Matsushita, S.

in Journal of Geophysical Research (1977), 82

Ogo 4 measurements of the UV equatorial airglow made during a period which included a major magnetic storm are analyzed and used as an indicator of wind direction and velocity as well as ExB drift ... [more ▼]

Ogo 4 measurements of the UV equatorial airglow made during a period which included a major magnetic storm are analyzed and used as an indicator of wind direction and velocity as well as ExB drift magnitude and phase. Some features of the airglow intensity and distribution are explained in terms of storm-induced changes in vertical drift velocity, neutral composition, or both. The observations are shown to be consistent with an eastward neutral wind that transports ionization from the Southern to the Northern Hemisphere while raising the F layer in the South and lowering it in the North. Theoretical modeling of the low-latitude F-region ionosphere indicates that an eastward wind with velocity approaching 300 m/s at 2100 LT can qualitatively produce the observed hemispheric asymmetries in airglow emission rates. [less ▲]

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See detailSustainability of Change in Education
de Landsheere, Gilbert ULg

Conference (1977, March)

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See detailHigh-latitude nitric oxide in the lower thermosphere
Gérard, Jean-Claude ULg; Barth, C. A.

in Journal of Geophysical Research (1977), 82

High-latitude observations of fluorescent nitric oxide gamma bands were made before and during a strong magnetic storm with the Ogo 4 ultraviolet spectrometer. Brightness measurements of the (1-0) gamma ... [more ▼]

High-latitude observations of fluorescent nitric oxide gamma bands were made before and during a strong magnetic storm with the Ogo 4 ultraviolet spectrometer. Brightness measurements of the (1-0) gamma band of nitric oxide indicate a slow buildup of NO during the disturbed period. The NO column density reaches a value as high as a factor of 8 greater than the midlatitude value and shows no correlation with the brightness of the instantaneous aurora. A time-dependent model calculation indicates that the ionization and dissociation of N2 by auroral electrons can increase the NO and N(4-S) densities. This increase is dependent on the intensity and duration of the auroral precipitation and on the branching ratio of N(2-D) production by dissociation of N2. A steady state is not reached for NO until 100,000 sec in an aurora characterized by an energy flux of 10 ergs per sq cm sec. Dissociation by the solar ultraviolet radiation competes with horizontal and vertical transport as a loss process for the nitric oxide produced by the aurora. A high NO(plus)/O2(plus) ratio is to be expected in the period following a strong auroral precipitation. [less ▲]

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See detailPhotometric observations of HD 50169.
Heck, A.; Maitzen, H. M.; Renson, Pierre ULg

in Astronomy and Astrophysics (1977), 54

Abstract image available at: http://adsabs.harvard.edu/abs/1977A&A....54..635H

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See detailLa période de HR 8861 = ET And
Renson, Pierre ULg

in Astronomy and Astrophysics (1977), 54

Abstract image available at: http://adsabs.harvard.edu/abs/1977A&A....54..277R

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See detailBiosynthèse de la paroi bactérienne
Tinelli, Regina; Ghuysen, Jean-Marie ULg

in Bulletin de l'Association des Anciens Elèves de l’Institut Pasteur [=Bulletin de l'AAEIP] (1977), 71

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See detailLes bureaux, un nouveau phénomène urbain ?
Donnay, Jean-Paul ULg

in G.E.O. (1977), (1), 43-50

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