Uncoupling nitrogen requirements for spring growth from root uptake in a young evergreen shrub (Rhododendron ferrugineum).

•   Internal cycling of nitrogen (N) was investigated in a subalpine field population of the evergreen shrub Rhododendron ferrugineum during spring growth. •   The foliar nitrogen of 5-yr-old-plants was directly labeled with N and subsequently traced to all plant compartments. In addition, N-ammonium uptake was estimated in glasshouse experiments.

Sensitization to the isothiazolinone biocide. Report of the Swiss Contact Dermatitis Research Group 1988-1990.

The rate of sensitization to isothiazolinones (Kathon CG) detected in Switzerland rose from 3.5% (out of 2,491 patients) in 1987 to 6.3% (out of 982 patients) in 1988 and 5.

Relationship between Merkel cells and nerve endings during embryogenesis in the mouse epidermis.

Close relationships between Merkel cells (MC) and nerve endings (NE) exist in the adult mouse. Because MC may serve as targets for the ingrowth of NE during embryogenesis, the purpose of the present study was to analyze the relationship between MC and NE during embryogenesis. Frozen tissue from whisker pads and backs of NMRI mouse embryos (12-17 d gestational age) were studied by double-labeling indirect immunofluorescence (IIF) with a cytokeratin monoclonal antibody that recognizes MC and with a neurofilament anti-serum.

Sodium hydroxide-induced subclinical irritation. A test for evaluating stratum corneum barrier function.

This report concerns the development of a short, simple, non-invasive test for assessing sensitivity to irritant dermatitis. Application of NaOH (0.005-2.