| 释义 |
proˈtectant, a. and n.
[irreg. f. prec. + -ant.]
A. adj.
a. = protective a. 1.
b. Protecting (esp. plants) against disease.
1670Conclave wherein Clement VIII was elected Pope 29 He would be his friend, and would always be graciously protectant of his Majesty. 1943Phytopathology XXXIII. 627 (heading) The slide⁓germination method of evaluating protectant fungicides. 1954Jrnl. Econ. Entomol. XLVII. 462 (heading) Protection of stored shelled corn with a protectant dust in Indiana. 1977Protecting World's Crops (Shell Internat. Petroleum Co.) 2 Protectant fungicides, if applied before the disease occurs, kill or inhibit the development of fungal spores or mycelia (strands of fungus) before they can damage plant tissues.
B. n. An agent that protects, esp. a plant against disease.
1935Jrnl. Pomol. & Hort. Sci. XIII. 262 The effects of the wetting agents..upon the biological activities of the protectant..have to be determined. 1940Phytopathology XXX. 2 Synthetic organic chemicals developed by the Crop Protection Institute were efficient, non-injurious seed protectants for combating damping-off in Lima beans. 1960New Scientist 4 Aug. 344/1 Removal of the dark green colouring matter present in crude preparations of pyrethrum markedly increased its stability in sunlight, and further improvement was achieved by the addition of..a number of antioxidants... The data suggest that these compounds act primarily as protectants for pyrethrin II and cinerin II, whereas the absence of ‘chlorophyll’ pigments enhances the stability of pyrethrin I and cinerin I. 1975Nature 22 May 329/1 It is clear that as a protectant, sclareol is highly specific for rust fungi. |