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火麻仁脂溶性成分的GC-MS分析   总被引:9,自引:0,他引:9  
张媛  王喆之 《西北植物学报》2006,26(9):1955-1958
采用索氏提取法提取火麻仁中脂溶性成分,进行甲酯化处理后用气相色谱-质谱联用技术分离和鉴定其组成和含量.共鉴定29种脂溶性成分,其中脂肪酸甲酯化产物占99.32%(其中饱和脂肪酸甲酯为12.36%,不饱和脂肪酸甲酯为86.96%),13种成分在火麻仁脂溶性成分的研究中未见报道.研究结果表明,火麻仁在食用、医疗保健等方面具有较大的应用潜力和开发前景.  相似文献
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目的通过分析汉麻织物、含纳米银锦纶纤维织物和无机银抗菌整理后棉布对红色毛癣菌、须癣毛癣菌生长的影响,探讨抗菌织物对皮肤癣菌的抑制作用。方法制备红色毛癣菌、须癣毛癣菌的菌悬液,分别接种于上述抗菌织物,并紧贴在PDA培养基表面培养,每12 h观察菌落形态及大小,根据菌落平均直径绘制生长曲线。结果三种抗菌织物上24 h内均未见菌落生长。①汉麻布样上,红色毛癣菌和须癣毛癣菌菌落直径分别在36-84 h、36-72 h时间区间内小于棉布组,差异有显著性(P〈0.05),之后与棉布组渐趋一致。②含纳米银锦纶织物上,在36-108 h内红色毛癣菌菌落直径小于棉布组,差异有显著性(P〈0.05),120 h时已无显著差异(P〉0.05),须癣毛癣菌在48 h后才开始生长,在60-108 h区间内菌落直径小于棉布对照(P〈0.05)。③无机银抗菌整理后棉布样上,红色毛癣菌和须癣毛癣菌分别在48 h和60 h后才开始生长,在120 h以内两种皮肤癣菌菌落直径均小于棉布组,差异有显著性(P〈0.05)。结论三种抗菌织物与棉布相比较,在一定时间区间内,均可显著抑制红色毛癣菌和须癣毛癣菌的生长,尤其是经无机银抗菌整理后棉布的抑菌更有效和持久。  相似文献
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麻类织物对须癣毛癣菌生长抑制作用的研究   总被引:1,自引:0,他引:1  
目的通过分析汉麻、亚麻和苎麻对须癣毛癣菌生长的影响,探讨麻类织物对浅部真菌的抑制作用。方法实验采用振荡法。将3种麻类织物分别与须癣毛癣菌混合培养,对照组为棉布组,3d后分别取培养液稀释5倍后涂布培养皿,计算各自的菌落数和抑菌率并进行统计分析。结果麻类织物组菌落数明显少于对照组棉布组(P<0.01),3种麻类织物对须癣毛癣菌的抑菌率均高于60%,但3种麻类织物的抑菌率之间无明显差异(P<0.01)。结论3种麻类织物均可显著抑制须癣毛癣菌的生长,麻类织物有可能用来预防由须癣毛癣菌引起的足癣、股癣等浅部真菌病。  相似文献
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Colletotrichum truncatum isolate NRRL 13737 (ARS patent culture No. 18434) is being evaluated for development as a mycoherbicide against the problematic weed Sesbania exaltata. Studies were conducted to determine whether selected phylloplane microorganisms, used as coinoculants, could increase the severity of disease incited by C. truncatum in S. exaltata. Hemp Sesbania seedlings were grown in a variety of soils and environments, sprayed with conidia of C. truncatum, and the formation of appressoria was examined on leaves using epifluorescence microscopy. From hemp sesbania plants that supported high levels of appressoria formation, over 200 phyllosphere microorganisms were isolated. Fifteen of 73 microbial isolates assayed stimulated appressoria formation in vitro on cellophane membranes. Five of 8 superior isolates from the in vitro assay also enhanced disease symptoms induced by C. truncatum on S. exaltata compared to seedlings treated with conidia only. Populations of three selected superior isolates remained high on leaves during plant exposure to dew. The superior isolates initiated no apparent symptoms and rarely decreased seedling growth parameters in the absence of C. truncatum. This is the first instance of utilizing phylloplane microorganisms to increase the level of disease incited by a mycoherbicide agent. Microbial facilitators may provide a means of improving the weed control efficacy of mycoherbicides.  相似文献
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This study investigates the change in chemical and crystalline structure of pulp samples during alkali sulfite process at different cooking temperatures and time, TAPPI and SCAN standard test methods and X-ray diffraction and FT-IR spectroscopy were used. It was shown that the crystalline structure of cellulose in hemp (Cannabis sativa L.) bast fibers was very strong and stable. Crystallinity of alkali sulfite pulp samples obtained from processing at 140 up to 180 °C increased, but then decreased at 200 °C. The crystallite size of cellulose in alkali sulfite pulp samples increased with cooking temperature. The crystalline allomorph of cellulose in alkali sulfite pulp samples obtained at 200 °C changed from monoclinic structure to triclinic structure. Crystalline structure of cellulose in alkali sulfite pulp samples was little affected by changing cooking time. It was concluded that cooking temperature during alkaline sulfite pulping process had more effect on carbohydrate components and crystalline structure of pulp samples than cooking time.  相似文献
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This paper concerns the morphology of hemp woody core cells, investigated by optical and scanning electron microscopy, and the chemical analysis of the hemp cells. Steam explosion was investigated as a pre-treatment step for woody hemp ‘chènevotte’, with the aim of optimizing the separation and delignification of woody fibres.

In this study, we report the results of five experiments performed on ‘chènevotte’ samples impregnated in acid solution (0.1% w/w H2SO4) and steamed at 200, 210, 220, 230 and 240°C for 180 s. The effect of process temperatures on the woody hemp core after acidic impregnation was followed by optical and scanning electron microscopy, by assessment of the chemical composition, and by evolution of the average degree of polymerization (DPv) values of the purified wood fibres.

We found that treatment at 200 and 210°C led to samples that were difficult to delignify because the destructuring and disintegration of lignocellulosic materials were insufficient. A temperature of the order of 220–230°C is required to obtain well-separated fibres. However, at a temperature of 240°C, degradation and fibre damage were noted.  相似文献

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