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1.
本文讨论了对带瘤小鼠注射香菇多糖、松口蘑多糖和羊脾RNA后,活体内有关组织中cAMP含量与抑瘤率之间的关系。 结果表明,上述活性物质不仅增强了机体免疫活性,同时亦促使机体内脾、瘤等组织的cAMP增高,此种增高,与抑瘤率成正相关。 相似文献
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In the evergreen Fagaceae forests of Japan, an ectomycorrhizal fungusTricholoma bakamatsutake forms shiros or developing mycelial blocks. To determine the physiological characteristics of the mycelial blocks, organic acids of the soil and major nutrient elements of the soil and roots were compared at three types of sites: presently colonized mycelial blocks, previously colonized sites behind the blocks, and uncolonized sites in front of the blocks. The upper part of the mycelial blocks showed the following features compared with the uncolonized site: lower pH (5.1), higher concentrations of oxalic and gluconic acids, lower content of total nitrogen, a similar amount of total carbon, reduced total and available phosphorus, higher content of total calcium and lower content of exchangeable calcium. These findings suggested that the activity of the fungus led to soil acidification by the organic acids, an increase in C/N ratio, depletion of phosphorus and accumulation of calcium. 相似文献
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Jie Zhao Xuejing Yin Zhihao Dong Siran Wang Junfeng Li Dong Dong Tao Shao 《Journal of applied microbiology》2022,132(3):1675-1686
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林芝地区松茸营养成分分析及松茸多糖的提取分离 总被引:4,自引:0,他引:4
以林芝地区5个样点采集的野生鲜松茸子实体为材料,对水分、粗蛋白、粗脂肪、粗纤维、粗多糖、氨基酸、灰分、VC及矿质元素的含量、有效成分进行测定,并以正交法确定了松茸多糖提取的最佳工艺条件。结果表明:各组分的平均质量分数分别为89.45%、12.02%、7.74%、7.84%、9.53%、8.67%、5.76%、0.5046 mg.g-1;矿质元素中K、P含量较高,平均24.063mg.g-1、5.278 mg.g-1,Zn含量高于其它常见食用菌子实体,平均0.5648 mg.g-1,Ca的含量偏低,平均0.4356 mg.g-1;同时含有甾体等有效成分。松茸多糖提取主次因素和最优工艺为乙醇体积分数85%、料水比为1:10、温度80℃、时间4 h,在此条件下粗多糖得率为8.98%。 相似文献
7.
5种珍稀食药用真菌活性提取物对果蝇寿命影响的研究 总被引:4,自引:0,他引:4
探讨了松茸、栎金钱菌、蜂窝菌、云芝、杏鲍菇活性提取物对果蝇寿命的影响,分别用这5种食药用真菌活性提取物各以5、20g/L的剂量加入培养基中培养果蝇,观察其对果蝇寿命的影响.结果表明,松茸、栎金钱菌、蜂窝菌、云芝、杏鲍菇的活性提取物能显著延长果蝇的平均寿命和半数死亡时间,其平均寿命延长率分别达23.96%、53.22%、23.09%、32.58%、20%.这提示松茸、栎金钱菌、蜂窝菌、云芝、杏鲍菇都具有良好的延寿效果. 相似文献
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Mizuho Kusuda Mitsuhiro Ueda Yasuhito Konishi Yoshihito Araki Katsuji Yamanaka Masami Nakazawa Kazutaka Miyatake Takao Terashita 《Mycoscience》2006,47(4):184-189
We investigated extracellular carbohydrase production in the medium of an ectomycorrhizal fungus, Tricholoma matsutake, to reveal its ability to utilize carbohydrates such as starch as a growth substrate and to survey the saprotrophic aspects.
We found β-glucosidase activity in the static culture filtrate of this fungus. The β-glucosidase was purified and characterized.
The purified enzyme was obtained from about 2.1 l static culture filtrate, with 9.0% recovery, and showed a single protein
band on SDS-PAGE. Molecular mass was about 160 kDa. The enzyme was most active around 60°C and pH 5.0, and stable over a pH
of 4.0–8.0 for 30 min at 37°C. The purified enzyme was activated by the presence of Ca2+ and Mn2+ ions (about 2–3 times that of the control). The enzyme readily hydrolyzed oligosaccharides having a β-1,4-glucosidic linkage
such as cellobiose and cellotriose. However, it did not hydrolyze polysaccharides such as avicel and CM-cellulose or oligosaccharides
having an α-glucosidic linkage. Moreover, cellotriose was hydrolyzed by the enzyme for various durations, and the resultant
products were analyzed by TLC. We concluded that the enzyme from T. matsutake seems to be a β-glucosidase because cellotriose with a β-1,4-glucosidic linkage decomposed to glucose during the enzyme reaction. 相似文献
9.
ANTHONY R. AMBROSE STEPHEN C. SILLETT & TODD E. DAWSON 《Plant, cell & environment》2009,32(7):743-757
We examined changes in branch hydraulic, leaf structure and gas exchange properties in coast redwood ( Sequoia sempervirens ) and giant sequoia ( Sequoiadendron giganteum ) trees of different sizes. Leaf-specific hydraulic conductivity ( k L ) increased with height in S. sempervirens but not in S. giganteum , while xylem cavitation resistance increased with height in both species. Despite hydraulic adjustments, leaf mass per unit area (LMA) and leaf carbon isotope ratios ( δ 13 C) increased, and maximum mass-based stomatal conductance ( g mass ) and photosynthesis ( A mass ) decreased with height in both species. As a result, both A mass and g mass were negatively correlated with branch hydraulic properties in S. sempervirens and uncorrelated in S. giganteum . In addition, A mass and g mass were negatively correlated with LMA in both species, which we attributed to the effects of decreasing leaf internal CO2 conductance ( g i ). Species-level differences in wood density, LMA and area-based gas exchange capacity constrained other structural and physiological properties, with S. sempervirens exhibiting increased branch water transport efficiency and S. giganteum exhibiting increased leaf-level water-use efficiency with increasing height. Our results reveal different adaptive strategies for the two redwoods that help them compensate for constraints associated with growing taller, and reflect contrasting environmental conditions each species faces in its native habitat. 相似文献
10.
松茸多糖抗辐射功能的初步研究 总被引:3,自引:0,他引:3
预防给予小鼠松茸多糖(PTM),测定小鼠在受到2 Gy X线照射后,脾和胸腺重量、T淋巴细胞转化能力、外周血中白细胞数和肝组织中SOD、CAT、GSH-Px活性及MDA含量的变化,结果显示PTM处理组小鼠的各项指标与辐射对照组比较均有显著性差别,提示PTM可促进机体自由基的清除,增加机体抗氧化能力,对辐射所致的免疫损伤有明显的保护作用。 相似文献