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Biomedical subjects

Y Hennequin

Publications and source records attributed to Y Hennequin.

11 recordsLinked to original sources
PubMed2005

Miscibility of small colloidal spheres with large polymers in good solvent.

Nearly athermal colloid-polymer mixtures were studied in the "protein limit." A fluid-fluid transition was observed in mixtures of stearyl-alcohol-coated silica particles and large polystyrene coils in toluene. The ratios of the polymer radius of gyration to the particle radii were q=4.1 and q=5.2. The binodal curves and the critical points were determined. Turbidity measurements and analysis for one set of particles allowed the systems to be mapped onto hard sphere-polymer mixtures. A comparison with recent predictions for the miscibility of model mixtures shows that the experimental binodals lie between the two extreme results for ideal and interacting polymers. The critical colloid volume fraction is also found to decrease with increasing size ratios.

Journal Article↗
PubMed2002

[The intensive and non-intensive neonatal care department].

To be born very prematurely in 2002 is very different of to be born very prematurely in 1978: the progress of the fetal and perinatal care have, amongst others, decrease the mortality of the neonates with a birthweight below < 1,000 g from 61% to 12%. The technological progresses in artificial ventilation have led to a significant decrease in chronic lung disease down to 5% or less, and of cerebral complications (intraventricular hemorrhages, grade 3 and 4 and/or periventricular leucomalacia) down to 11% or less. The progress in surgery and anesthesiology have allowed us to operate the extremely low birthweight infants in the neonatal unit when needed. This has been possible thanks to a multidisciplinary team approach: many specialists working together from conception to birth and from birth to home try to offer the best to these sometimes very small human beings.

Belgium↗
PubMed1999

H(3)Si(37)Cl Revisited with High Resolution: The Ground State and the v(2) = 1; v(3) = 1, 2, and 3; v(5) = 1; v(6) = 1 and 2; and v(3) = v(6) = 1 States.

The infrared spectrum in the range 400-1600 cm(-1) of isotopically pure H(3)Si(37)Cl has been recorded at high resolution (2.4-6.6 x 10(-3) cm(-1)) and analyzed. Fifteen bands have been studied, namely the four fundamentals nu(3) (543.968 cm(-1)), nu(6) (663.738 cm(-1)), nu(2) (947.982 cm(-1)), and nu(5) (950.657 cm(-1)), the overtone bands 2nu(3), 2nu(0)(6), and 2nu(-/+2)(6), the combination band nu(3) + nu(6), and seven hot bands. Improved ground state constant parameters have been obtained, including all four sextic distortion constants. As for the J-independent parameters A(0), D(0)(K), and H(0)(K), they were determined mainly through the "loop method" involving nu(6), 2nu(-/+2)(6), and 2nu(-/+2)(6)-nu(+/-1)(6) and checked through the strong interactions between nu(2) and nu(5), producing some "forbidden lines." The nu(2)/nu(5) dyad was fitted with success using two different reduced Hamiltonians. Concerning nu(3) and nu(6), in spite of their relatively large separation, a Coriolis interaction could be evidenced. In both nu(2)/nu(5) and nu(3)/nu(6) interacting systems the sign of the interaction was found positive. As for the overtones, 2nu(3) was treated as isolated and 2nu(0)(6) and 2nu(-/+2)(6) as linked together by an l(2, 2) interaction. The data on the v(3) = v(6) = 1 levels were obtained mainly from the two hot bands nu(3) + nu(6) - nu(3) and nu(3) + nu(6) - nu(6), and marginally from the weak band nu(3) + nu(6), and also fitted as for an isolated level. A weak x,y-Coriolis interaction with level crossing between K/(kl - 1) = 21 and 22, and a local l(1, -2) resonance at K = 13/kl = -15 between 2nu(3) and nu(5) were furthermore detected. Copyright 1999 Academic Press.

Journal Article↗
PubMed1999

[Twins: interpretation of height-weight curves at birth].

Weight, head circumference and body length curves were established with the data at birth of 770 twins born alive in our hospital. Those curves were compared with the Gairdner-Pearson curves realized on a population of singleton newborns. The twin weight curve shows the expected fall down from 32 weeks of gestation. More than 50% of twins would have been qualified as small for dates on the Gairdner standard for singletons. The head circumference and the body length curves show few differences, except a late fall down, significant from 39 weeks. So the normal twin shows usually an "asymmetrical" hypotrophy if compared with a general newborn population standard. The general weight standards do not allow to assess the normality of a twin and to suspect other reasons of fetal growth restriction that could also be present. These considerations plead for the use of specific twin charts. Yet the evaluation of twins on the general standards has still a place to estimate the immediate and at long-term adverse outcomes of fetal growth restriction. The evaluation of twin measurements would not be completed without the assessment of the weight discordancy inside the twin couple, as a risk factor of morbidity and mortality.

Birth Weight↗
PubMed1985

Partial bronchial stenosis following inadvertent right bronchial intubation in a neonate.

This case reports difficulties encountered in weaning a premature infant with bronchopulmonary dysplasia from prolonged mechanical ventilation. On chest X-ray alternating atelectasis and hyperinflation of the right lung were observed. This resulted from a short episode of misplaced endotracheal tube that produced a traumatic bronchial stenosis. Treatment by prednisolone allowed the detubation.

Bronchi↗