0000000000424023
AUTHOR
A. Villanueva
Papillary squamous cell carcinoma of the oropharynx.
A case of papillary squamous cell carcinoma of the oropharynx is reported. The lesion was located in the base of the tongue and grossly presented a characteristic finger-like pattern of growth. The clinicopathological profile of the neoplasm is presented and the differential diagnosis with other exophytic squamous cell carcinomas is discussed.
Application de la topologie moléculaire à la prédiction de la viscosité liquide des composés organiques
Nous avons applique la topologie moleculaire a la recherche d'un modele mathematique capable de predire la viscosite liquide d'un large groupe de composes organiques contenant C, H, O, N, S et des halogenes. Les descripteurs topologiques utilises pour cette etude des relations quantitatives structure-propiete, R.Q.S.P., sont les indices de connectivite de Kier et Hall -jusqu'a l'ordre quatre- ainsi que les indices atomiques electrotopologiques. La qualite de l'equation de regression multilineaire obtenue (aussi dite « fonction de connectivite») a ete evaluee par une etude de validation croisee. Tous les composes excepte le 1,1,2-trichlorotrifluorethane s'ajustent au modele propose.
Evaluation of reverse transcription and polymerase chain reaction (RT/PCR) for the detection of rotaviruses: applications of the assay.
Summary Our aim was to evaluate the reverse transcription and polymerase chain reaction (RT/PCR) technique for the detection of rotavirus shedding by infected children as a routine diagnostic procedure, in comparison to the enzyme-linked immunosorbent assay (ELISA), electron microscopy (EM) and polyacrylamide gel etectrophoresis (PAGE) of rotavirus double stranded RNA. Two-hundred and twenty stool specimens were collected from infants and young children with diarrhoea, and 10–20% faecal suspensions were made. Several methods of rotavirus dsRNA extraction were assayed. Electrophoretic analysis of viral RNA was carried out on 10% polyacrylamide gols followed by silver staining. RT/PCR was per…