The aim of the present study was to evaluate the antifungal activity of fatty acids against phytopathogenic fungi. Two pot experiments were conducted by mixing palmitic and oleic acids in the soil in which poor plant growth was observed. In addition, the antifungal activities of nine fatty acids (butyric acid, caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, oleic acid, and linoleic acid) against four phytopathogenic fungi: Alternaria solani, Colletotrichum lagenarium, Fusarium oxysporum f. sp. Cucumerinum, and Fusarium oxysporum f. sp. lycopersici, were assessed by measuring mycelial growth and spore germination via Petri dish assay. The results of the pot experiments showed that the mixture of palmitic and oleic acids enhanced the growth of the seedlings of continuous-tomato and continuous-cucumber. Except for oleic acid, in the Petri dish assay, the fatty acids tested were observed to inhibit the mycelial growth of one or more tested fungi. In addition to the suppression of mycelial growth, butyric acid, caproic acid, caprylic acid, capric acid, lauric acid, and palmitic acid showed an inhibitory effect against spore germination and the extent of inhibition varied with both the type of fatty acids, and the fungi. In particular, capric acid displayed strong inhibitory effect against C. lagenarium on the mycelial growth and spore germination. The saturated fatty acids, i.e. palmitic acids, showed stronger antifungal activity than the unsaturated fatty acids, i.e. oleic acid. It suggests that fatty acids might be applicable to exploring for alternative approaches to integrated control of phytopathogens.
In tone languages, the identity of a word depends on its tone pattern as well as its phonetic structure. The primary cue to tone identity is the fundamental frequency (F0) contour. Two experiments explore spoken word recognition how listeners perceive Mandarin monosyllables in which all or part of the F0 information has been neutralized. In Experiment 1, tone languages supposedly critical portions of the tonal pattern were neutralized with signal processing techniques, yet identification of the tonal pattern remained quite good. In Experiment 2, even more drastic removal of tonal information was tested, using stimuli whispered by Mandarin speakers, or signal processed to remove the pitch cues. Again, performance was surprisingly good, showing that listeners can use secondary cues when the primary cue is unavailable. Moreover, a comparison of tone perception of naturally whispered monosyllables and the signal processed ones suggests that Mandarin speakers promote the utility of secondary cues when they know that the primary cue will be unavailable. The flexible use of cues to tone in Mandarin is similar to the flexibility that has been found in the production and perception of cues to phonetic identity in Western languages.
BackgroundA national health literacy scale was developed in China in 2012, though no studies have validated it. In this investigation, we assessed the reliability, construct validity, and measurement invariance of that scale.MethodsA population-based sample of 3731 participants in Hunan Province was used to validate the Chinese Resident Health Literacy Scale based on item response theory and classical test theory (including split-half coefficient, Cronbach’s alpha, and confirmatory factor analysis). Measurement invariance was examined by differential item functioning.ResultsThe overall Cronbach’s alpha of the scale was 0.95 and Spearman-Brown coefficient 0.94. Confirmatory factor analysis showed that the test measured a unidimensional construct with three highly correlated factors. Highest discrimination was found among participants with limited to moderate health literacy. In all, 64 items were selected from the original scale based on factor loading, Pearson’s correlation coefficient, and discrimination and difficulty parameters in item response theory. Measurement invariance was significant but slight. According to the two-level linear model, health literacy was associated with education level, occupation, and income.ConclusionsThe 2012 national health literacy scale was validated, and 64 items were selected based on classical test theory and item response theory. The revised version of the scale has strong psychometric properties with minor measurement invariance.
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