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[目的]探索黄粉虫抗菌肽的生物学性质。[方法]通过菌液注射对黄粉虫幼虫进行抗菌肽的诱导,对其热敏感性、反复冻融的稳定性、抑菌活性的适宜pH值及部分抑菌谱进行测定,并对黄粉虫血淋巴抗菌肽进行了初步的分离纯化。[结果]黄粉虫抗菌肽热稳定性好,反复冻融对其活性影响不大,显示出一定的抗酸碱性能,在pH为5时抑菌效果最佳,对测试的6种动物病原细菌均有不同程度的抑制作用,特别是对猪致病性大肠杆菌和猪链球菌,具有较强的抑菌活性。经SephadexG-25凝胶过滤柱层析分离得到3个活性峰,表明黄粉幼虫血淋巴中有多个抗菌活性组分。[结论]该研究为黄粉虫抗菌肽的利用奠定了理论基础。 相似文献
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在饲料中添加不同量的硫酸锌喂养黄粉虫(Tenebrio molitor L.)幼虫,测定幼虫的锌含量和体重变化,计算黄粉虫幼虫的特定生长率和幼虫对锌的生物积累系数,分析黄粉虫幼虫对锌的富集作用.结果表明,在硫酸锌含量为100 mg·kg-1时,幼虫体内锌含量最高,干物质含量最高,对锌的积累系数最高,幼虫增重明显优于不添加硫酸锌的对照组;硫酸锌含量过高,幼虫的生长受到抑制. 相似文献
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福桔果皮精油对黄粉虫成虫的驱避作用和种群抑制作用 总被引:1,自引:0,他引:1
用水蒸汽蒸馏法提取福桔果皮精油后采用气相色谱质谱联用法分析出其主要成分是α-柠檬烯。采用滤纸药膜法和饲料拌药法分别研究了福桔果皮精油对黄粉虫成虫的驱避作用和种群抑制作用,研究结果表明:桔果皮精油对黄粉虫成虫有明显的驱避作用和种群抑制作用,驱避作用和种群抑制作用随着剂量的增加而加强。 相似文献
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为探讨亚硒酸钠对黄粉虫幼虫血淋巴谷胱甘肽过氧化物酶(GSH—PX)活性的影响,将黄粉虫的中龄幼虫随机分成6组,饲喂含不同浓度的亚硒酸钠饲料。采用DTNB比色法测定GSH—PX活性。结果显示,饲喂含亚硒酸钠的饲料后黄粉虫幼虫血淋巴GSH—PX活力都明显上升:饲喂同一浓度的亚硒酸钠,幼虫血淋巴GSH—PX活力均比对照组高,只有加硒浓度为20mg/kg.80mg/kg在第16d时,黄粉虫血淋巴GSH—PX活力随着饲喂时间的延长而显著上升;饲喂不同浓度的亚硒酸钠,在硒浓度为5mg/kg、10mg/kg时,黄粉虫血淋巴GSH-PX活力随亚硒酸钠浓度的增加显著上升,在硒浓度为20mg/kg时开始下降。 相似文献
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Xuegui Wang Qiang Hao Yiqu Chen Surong Jiang Qunfang Yang Qing Li 《Journal of insect science (Online)》2015,15(1)
The major chemical components of four essential oils (EOs) extracted from dry leaves of Citrus limonum, Cymbopogon citratus, Litsea cubeba, and Muristica fragrans were analyzed with gas chromatograph-mass spectrometer and their fumigant, contact, and repellent activities against 10th instar and adults of Tenebrio molitor were also assayed. The results indicated that the major constituents of C. limonum and Cy. citrates were D-limonene (38.22%) and 3,7-dimethyl-6-octenal (26.21%), while which of L. cubeba and M. fragrans were (E)-3, 7-dimethyl-2, 6-octadienal (49.78%) and (E)-cinnamaldehyde (79.31%), respectively. Contact activities of L. cubeba and C. limonum with LC50 values of 21.2 and 13.9 µg/cm2 at 48 h and repellence activities (>89.0% repellence indexes) (P < 0.05) at 12 h on 10th instar were better than those of the other two EOs. Nevertheless, the fumigation activities of L. cubeba on 10th instar and adults (LC50 = 2.7, 3.7 μl/liter) were stronger than those of C. limonum (LC50 = 10.9, 12.0 μl/liter) at 96 h and significant (not overlapping confidence intervals). The EOs of L. cubeba and C. limonum have clearly elongated the growth and development of larvae, egg, and slightly shorten pupae and adults of T. molitor compared with the control. The mainly active ingredients of L. cubeba and C. limonum, including D-limonene and β-pinene, were demonstrated to coinhibit the actives of AChE and enhance the toxicities on 10th instar of T. molitor. These results indicate that the EOs of L. cubeba and C. limonum could have great potential as botanical insecticides against T. molitor. 相似文献
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The ω-atracotoxin-Ar1b toxin(ω-ACTX-Ar1b)is one of the arthropod-selective peptide neurotoxins from the venom of Australian funnel-web spider Atrax robustus.The gene of Ar1b was synthesized and cloned into pET-32a(+)vector to allow expression of Ar1b as a fusion protein with thioredoxin and the His-tag(rTrx-Ar1b)in E.coli BL21(DE3).The optimal condition for inducing the expression of rTrx-Ar1b was 1.0 mmol L-1 IPTG for 6 h at 28℃.The fusion protein rTrx-Ar1b was expressed in soluble form and was purified effectively by His Trap HP affinity column and rpHLPC and a final yield of purified rTrx-Ar1b was 95 mg from 1000 mL E.coli culture.The LD50 values for Mythimna separate and Tenebrio molitor were 111.66 and 11.04 μg g-1 determined by injection of the purified rTrx-Ar1b.The results indicated that the recombinant Ar1b protein was successfully expressed in E.coli and it was high toxicity against tested insects. 相似文献