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Objectives: Cysteinyl leukotrienes have been implicated in the pathogenesis of adenotonsillar hypertrophy in children with obstructive sleep apnea (OSA). This study aimed to quantify the expression of cysteinyl leukotriene receptors (CysLT1, CysLT2) by tonsillar lymphocyte subpopulations from children with OSA and to make comparisons to lymphocyte subpopulations from control subjects with recurrent tonsillitis (RT). Methods: Tonsillar tissue from children with OSA or RT was studied for CysLT1 and CysLT2 expression by RT-PCR, flow cytometry (FC), and immunofluorescence. Results: Ten children with OSA and 10 control subjects were recruited. In OSA participants, CysLT1+ fraction of small-size CD19+ B-lymphocytes was similar to the CysLT1+ CD3+ T-lymphocytes fraction (FC: 36.5 [16.5-55.4] vs. 14 [2.8-22.1]) (p>0.05) and higher than the CysLT1+ moderate/large-size CD19+ B-lymphocytes fraction (6.6 [1.5-14.4]) (p

The population characteristics of Parapandalus narval are related to depth. Sex ratio (females/males and females) decreases with depth, while female size increases. Dry weight of equal sized individuals decreases with depth. For the 23 and 80 + 140 m females, the relative dry weight reduction was estimated to 10·3% and 16·0% compared to that of the 5 m females, respectively. Males (80-220 m) exhibited the greatest reduction of 19·9%. It is suggested that the depth zonation exhibited by the P. narval population is related to habitat differences along the depth range sampled and has to do with the exploitation of the available food resources by different sex and/or size groups. © 1989.