Size and mortality rates of Glossina pallidipes in the semi-arid zone of southwestern Kenya

Seasonal changes in the mean size of tsetse, Glossina pallidipes Austen, as indicated by wing vein length, were monitored during 1983-86 at Nguruman, southwestern Kenya. Changes in size of nulliparous females and wing fray category 1 males were shown to be correlated with the relative humidity 2 months before they were captured. Soil temperature when flies were in the pupal stage had much less effect. Size dependent mortality was demonstrated, with the mean size of flies emerging from pupae significantly less than that of field-caught flies. This mortality must occur at emergence, since there was no evidence of size-dependent mortality once the flies became available to the trap. Size was correlated with density-independent mortality acting on the parent population 2 months previously. It might therefore be possible to use size as an index of the intensity of such mortality. This could be useful when assessing the level of additional mortality required to suppress tsetse populations.     

Nuclear DNA sequences from late Pleistocene megafauna

We report the retrieval and characterization of multi- and single-copy nuclear DNA sequences from Alaskan and Siberian mammoths (Mammuthus primigenius). In addition, a nuclear copy of a mitochondrial gene was recovered. Furthermore, a 13,000-year-old ground sloth and a 33,000- year-old cave bear yielded multicopy nuclear DNA sequences. Thus, multicopy and single-copy genes can be analyzed from Pleistocene faunal remains. The results also show that under some circumstances, nucleotide sequence differences between alleles found within one individual can be distinguished from DNA sequence variation caused by postmortem DNA damage. The nuclear sequences retrieved from the mammoths suggest that mammoths were more similar to Asian elephants than to African elephants.      

Comparaison de la réponse métabolique du petit prématuré alimenté parentéralement,puis au lait maternel de prématurité.

The nitrogen retention and plasma amino acid concentration were determined in eight preterm infants (mean birth weight 970 +/- 130 g; mean gestational age 28 +/- 1 weeks) receiving successively total parenteral nutrition and their own mother''s milk. The nitrogen retention during both regimens was comparable to the fetal accretion rate. Plasma amino acid concentrations were lower during the enteral phase of the study than during parenteral nutrition. The metabolic response of small preterm infants is related to the quality of amino acids as well as to the route of intake.     

Association between median episiotomy and severe perineal lacerations in primiparous women

OBJECTIVE: To evaluate the association between median episiotomy and severe (third- and fourth-degree) perineal lacerations in primiparous women. DESIGN: Retrospective cohort study. SETTING: University-affiliated hospital providing secondary obstetric care in Quebec City. PATIENTS: A total of 6522 primiparous women who gave birth vaginally to a single live baby in cephalic position between 1985 and 1993. OUTCOME MEASURE: Incidence of third- and fourth-degree perineal lacerations. RESULTS: Median episiotomy was performed in 4390 women (67.3%). A total of 1002 women (15.4%) had a third- or fourth-degree laceration. The frequency of severe perineal lacerations was 20.6% with episiotomy and 4.5% without episiotomy (relative risk [RR] 4.58, 95% confidence interval [CI] 3.74-5.62). This association persisted after adjustment by stratified analysis for type of delivery and birth weight (RR 3.03, 95% CI 2.52-3.63) and by logistic regression for type of delivery, birth weight, epidural analgesia, shoulder dystocia, baby''s head circumference, experience of the physician and year of delivery (odds ratio 3.58, 95% CI 2.84-4.50). CONCLUSION: Median episiotomy is strongly associated with third- and fourth-degree perineal lacerations in primiparous women. Reducing the use of this procedure could decrease the occurrence of severe perineal tears.