Betekenis van:
frond

Voorbeeldzinnen

1. total frond area;
2. Chlorosis: is the yellowing of frond tissue.
3. Frond number is the primary measurement variable.
4. In this method frond number, frond area, fresh weight and dry weight are measurement variables.
5. Total frond area: The total frond area of all colonies may be determined by image analysis.
6. The desired toxicity parameters are therefore four ECx values for each inhibition level x calculated: ErCx (frond number); ErCx (total frond area, dry weight, or fresh weight); EyCx (frond number); and EyCx (total frond area, dry weight, or fresh weight).
7. Necrosis: is dead (i.e. white or water-soaked) frond tissue.
8. Toxicity estimates should be based on frond number and on one additional measurement variable (total frond area, dry weight or fresh weight), because some substances may affect other measurement variables much more than the frond number.
9. For this method, growth rates and yield are response variables derived from measurement variables like frond number, frond area, fresh weight or dry weight.
10. Measurement variables: are any type of variables which are measured to express the test endpoint using one ore more different response variables. In this method frond number, frond area, fresh weight and dry weight are measurement variables.
11. Effects on yield are determined on the basis of two measurement variables, frond number and one other measurement variable (total frond area, dry weight or fresh weight) present in each test vessel at the start and end of the test.
12. Monoculture: is a culture with one plant species. Necrosis: is dead (i.e. white or water-soaked) frond tissue.
13. Estimates of the ECx (e.g. EC50) should be based upon both average specific growth rate (ErCx) and yield (EyCx), each of which should in turn be based upon frond number and one additional measurement variable (total frond area, dry weight, or fresh weight). This is because there are test substances that impact frond number and other measurement variables differently.
14. Biomass: is the dry weight of living matter present in a population. In this test, surrogates for biomass, such as frond counts or frond area, are typically measured and the use of the term ‘biomass’ thus refers to these surrogate measures as well.
15. Average specific growth rate: this response variable is calculated on the basis of changes in the logarithms of frond numbers, and in addition, on the basis of changes in the logarithms of another measurement parameter (total frond area, dry weight or fresh weight) over time (expressed per day) in the controls and each treatment group.