Xyloketal G,a Novel Metabolite from the Mangrove Fungus <Emphasis Type="Italic">Xylaria sp.</Emphasis> 2508

A novel metabolite 1, named xyloketal G, was isolated from cultures of marine derived mangrove fungus Xylaria sp. 2508. Its structure was elucidated by analysis of spectroscopic data.__________Published in Khimiya Prirodnykh Soedinenii, No. 1, pp. 22–23, January–February, 2005.     

3β-Methoxyolean-18-ene (miliacin) from the marine fungus Chaetomium olivaceum

A pentacyclic tritepenoid, 3-methoxyolean-18-ene (miliacin), was isolated for the first time from the marine fungus Chaetomium olivaceum. Its structure was determined on the basis of 2D NMR spectroscopy and X-ray diffraction data.     

三种蕨类植物根际土壤中的真菌

从三种濒危植物的根际土壤中分离鉴定了分离于１２个属的７８株真菌,其中,青霉属,镰孢属和假葡萄孢属真菌是三种蕨类植物根际土壤中的共有类群,三种植物根际土壤真菌的优势类群各自不同。     

Adsorption of H3PW12O40 by porous carbon materials

Adsorption of H₃PW₁₂O₄₀ from water and organic oxygen-containing solvents (AcOH, Me₂CO, MeOH) by carbon mesoporous materials, viz., Sibunit and catalytic filamentous carbons (CFC), was studied. The amount of irreversibly sorbed heteropolyacid is 50—100 mg g^–1 of support and decreases in the series of solvents: H₂O > Me₂CO > AcOH > MeOH. The adsorption capacity of CFC depends on the specific surface, total pore volume, and microstructure of the CFC fiber.     

An Abietane Diterpene and a Sterol from Fungus Phettinus igniarius

A new abietane diterpene 12-hydroxy-7-oxo-5, 8, 11, 13-tetraene-18, 6-abietanolide, together with a new natural sterol stigmasta-7, 22-diene-3β, 5α, 6α-triol have been isolated from the fruiting body of the fungus Phellinus igniarius. Their structures were elucidated by spectroscopic methods including 2D NMR techniques.     

Cytotoxic sesterterpenes, 6-epi-ophiobolin G and 6-epi-ophiobolin N, from marine derived fungus Emericella variecolor GF10

Two new sesterterpenes, 6-epi-ophiobolin G (1) and 6-epi-ophiobolin N (3), and six known ophiobolins were isolated from the extracts of the fungus, Emericella variecolor GF10, which was separated from marine sediment. The planar structures of the new compounds were deduced from analysis of the 2D NMR spectra, and the stereochemistry was determined by extensive examination of the NOESY spectrum. Additionally, the configuration of the C-6 proton in ophiobolin G (2) was revised from α to β, and the unsolved stereochemistry of ophiobolin H (4) was determined by its physicochemical evidence and the chemical correlation with ophiobolin K (8). Ophiobolin K (8) showed cytotoxic activity against various tumor cell lines, including adriamycin-resistant mouse leukemia cells (P388), with IC₅₀ of 0.27-0.65 μM.     

胞内聚合物在絮凝体与丝状菌污泥中的形成

研究了两种反应器 (间歇式反应器和连续流反应器 )在使用两种有机基质 (葡萄糖和乙酸钠 )的条件下 ,污泥膨胀发生及与胞内聚合物形成的关系 .得到结论 :丝状菌降解化学需氧量COD的速率和形成胞内有机聚合物的速率较慢 ,且整个过程几乎速率不变 ;胞内有机聚合物形成量比絮凝体污泥少 ;而絮凝体污泥有极为明显的初期COD快速降解与胞内有机聚合物快速形成阶段     

广西鹅膏属(Amanita Pers.)3种易混淆的食用菌与剧毒磨菇

介绍食用菌橙盖鹅膏白色变种Ａｍａｎｉｔａｃａｅｓａｒｅａ（Ｓｃｏｐ．ｅｘＦｒ．）Ｐｅｒｓ．ｅｘｓｃｈｗ．ｖａｒ．ａｌｂａＧｉｌｌ．）、剧毒磨菇春生鹅膏（Ａ．ｖｅｒｎａ（Ｂｕｌｌ，ｅｘＦｒ．）Ｐｅｒｓ．ｅｘＶｉｔｔ．）和鳞柄白鹅膏（Ａ．ｖｉｒｏｓａＬａｍ．ｅｘＳｅｅｒ．）的形态特征和特性．     

富硒鲍鱼菇的深层培养及其特性

报导在含有不同浓度无机硒的液体培养基中培养鲍鱼菇菌丝体，探讨其耐硒和富硒特性。结果表明：鲍鱼菇有较强的耐硒特性和很强的富硒能力，鲍鱼菇菌丝体硒含量随培养基质硒浓度的增加而增高，在培养基中添加硒量为５μｇ／ｍｌ时，富硒鲍鱼菇菌丝体含硒量可达２００μｇ／ｍｌ时，为对照的４０倍，硒回收率达３８．８％，其氨基酸及多糖含量均高于对照。     

一株纤维素分解菌的分离选育

以天然秸秆纤维素为碳源,从土壤、酒糟及牛粪中共分离到5株能分解纤维素的真菌菌株.分别对其进行了滤纸分解度、羧甲基纤维素酶活力(CM C ase)、滤纸糖化力(FPA)和天然纤维素酶活力的测定.结果表明:F-25菌株对滤纸的分解能力最强,不到12 h滤纸全成糊状;同时羧甲基纤维素酶活力、滤纸糖化力和天然纤维素酶活力也最高,分别为2.884(m g/mL).30 m in、0.36(m g/mL).h和2768(m g/mL).d.