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Qin Z.,South China Agricultural University | Qin Z.,Guangxi Sugarcane Research Institute | Wu J.,South China Agricultural University | Qiu B.-L.,South China Agricultural University | And 2 more authors.
Crop Protection | Year: 2011

The effects of four host plants (Agave sisalana, Ag. americana var. marginata, Ananas comosus Baili and An. comosus Smooth Cayenne) on the biology of the mealybug Dysmicoccus neobrevipes Beardsley were studied in the laboratory at 26 ± 1 °C, 75-90% RH and 14:10 (L:D) photoperiod. The development, survivorship, longevity, reproduction and life table parameters of D. neobrevipes differed among the host plants. The shortest developmental period (from the first instar nymph to adult) was recorded on An. comosus Smooth Cayenne (22.4 days for females and 21.3 days for males), whereas the longest was recorded on An. comosus Baili (25.6 days for females and 24.7 days for males). The highest survivorship was found on An. comosus Baili (98% for both females and males) and the lowest was on Ag. americana var. marginata (39.6% for females and 50% for males). Meanwhile the sex ratio and fecundity were highest and the pre-lay period was shortest on Ag. sisalana. The longest longevity of females was 62.5 days on An. comosus Baili, whereas the other host plants did not differ significantly with grand mean longevities of 51.0 days for females, while the longest and shortest longevities of males were 4.6 days and 2.3 days on Ag. americana var. marginata and Ag. sisalana, respectively. Values for net reproductive rate, intrinsic rate of increase and finite rate of increase were highest on Ag. sisalana, whereas the mean generation time was shortest on An. comosus Smooth Cayenne. The results indicated that Ag. sisalana is the most suitable host for D. neobrevipes among the four tested plants. When reared on Ag. sisalana, D. neobrevipes had a short developmental period (females 22.7 days and males 23.8 days), high reproduction (418 nymphs/female) and a high intrinsic rate of increase (0.106). Results of this study indicated that host plant can largely influence the population dynamics of D. neobrevipes, and our findings are useful in understanding the roles of host plants in integrated management of this pest, including exploitation of these host plants in push-pull control. © 2011 Elsevier Ltd. Source

Wang L.,GuangxiUniversity | Liu X.,GuangxiUniversity | Weng M.,Guangxi Sugarcane Research Institute | Li Z.,GuangxiUniversity | And 2 more authors.
Advanced Materials Research | Year: 2012

Sugarcane bagasses were used as raw materials to produce the hemicelluloses, and the effects of temperature, alkali consumption, time and liquid to solid ratio on the extraction yield of hemicelluloses were investigated. Through the analysis of the response surface method, results were concluded that the best extraction process conditions were as follows: NaOH concentration 10.60%, extraction time 4.34 h, solid-liquid ratio 1:40.59, actual extraction rate is 31.486%, corresponding to the model prediction 31.4447% basically. © (2012) Trans Tech Publications, Switzerland. Source

Huang R.,Guangxi Academy of Agricultural science | Huang R.,Guangxi University | Fang F.,Guangxi Sugarcane Research Institute | Zhuang F.,Guangxi University | And 3 more authors.
Acta Horticulturae | Year: 2010

Seed yield of bitter gourd (Momordica charantia L.) is influenced by many factors. This study was conducted to explain hybrid seed yield variation induced by either environmental conditions or cultivation practices. The parental seeds were sown five times with a 15-days interval from February 22 to April 22; plant spacing was 100×30 cm, 100×40 cm and 100×50 cm; fruits per plant were kept as 3-fruit, 6-fruit and no limited. Plant density was the controlling factor of seed yield; higher plant density produced remarkably higher seed yield than those with low density. Sowing date had significant effects on seed yield, the highest seed yield (551.42 g plot-1) was obtained when seeds were sown on March 23, which was 155.44% higher than the lowest seed yield produced by sowing on April 22 (215.87 g plot-1). Seed yield per plot were closely correlated to fruit yield per plot (r=0.9428) and plant number per plot (r=0.6072). Although no variation on germination percentage among seeds harvested in different harvest phase were observed, the 1-15 d harvested seeds shown significantly greater in 1000-seed weight than those harvested in the 16-45 d period of the harvest phase. These results suggest the optimum sowing date (late February to late March), plant density (30,000-35,000 plants ha-1) and fruit set per plant (3 fruits) for seed production of bitter gourd in spring season. Moreover, seed harvest should be scheduled in the early harvest stage to achieve large seed size. Source

Ya Y.,China Ministry of Agriculture Nanning | Ya Y.,Guangxi Sugarcane Research Institute | Mo L.,China Ministry of Agriculture Nanning | Mo L.,Guangxi Sugarcane Research Institute | And 14 more authors.
Colloids and Surfaces B: Biointerfaces | Year: 2012

Mesoporous silica (MS) and amino-functionalized mesoporous silica (NH 2-FMS) were prepared and characterized using the techniques of transmission electron microscopy (TEM) and nitrogen adsorption-desorption. Voltammetry was used to investigate the electrochemical behavior of capsaicin at the amino-functionalized mesoporous silica, which was modified through carbon paste electrode (NH 2-FMS/CPE). NH 2-FMS/CPE showed better performance for the electrochemical oxidation of capsaicin, when compared with bare carbon paste electrode (CPE) and mesoporous silica modified carbon paste electrode (MS/CPE). We optimized the experimental conditions influencing the determination of capsaicin. Under optimal conditions, the oxidation peak current was proportional to capsaicin concentration in the range of 0.040-0.40μmolL -1and 0.40-4.0μmolL -1, when the detection limit was 0.020μmolL -1 (S/N=3). The above method was successfully applied to determine capsaicin in hot pepper samples, yielding satisfactory results. The spiked recoveries were in the range of 93.1-100.7%. © 2012 Elsevier B.V.. Source

Wang L.,Guangxi University | Liu X.,Guangxi University | Weng M.,Guangxi Sugarcane Research Institute | Wu F.,Guangxi University | And 2 more authors.
Advanced Materials Research | Year: 2013

Extracion of hemicelluloses from sugarcane bagasse under microwave radiation was studied in this paper. The effects of liquid to solid ratio (V (water): m (stover)), alkali consumption (m(NaOH): m (stover)), time, microwave power, and temperature on the extraction yield of hemicelluloses were investigated. The optimal parameters were: liquid to solid ratio of 25, alkali consumption of 2.0, time of 20 min, and microwave power of 1200 W. The obtained hemicelluloses was qualitatively analyzed by gas chromatography, and results showed that prepared hemicelluloses is a kind of xylan hemicelluloses, mainly consisting of simple sugars like D-xylose, D- arabinose, L- arabinose, D- galacturonic acid, D-galactose and D-mannose. © (2013) Trans Tech Publications, Switzerland. Source

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