Identification of a Novel Antibiotic from Myxobacterium Stigmatella Eracta WXNXJ-B and Evaluation of its Antitumor Effects I n - vitro.

This work was to isolate and identify the bioactive secondary metabolite which was produced by myxobacterium Stigmatella eracta WXNXJ-B, and to evaluate its antitumor and apoptosis-inducing effects. The results showed that one novel compound (molecular formula C29H25NO3) was isolated, purified by Sephadex LH-20 column chromatography and preparative RP-HPLC, and identified as 5-(6-benzyl-quinolin-3-ylmethyl)-6- phenyl-3,7-dioxa- bicycle [4.1.

Analysis of volatile compounds of Antrodia camphorata in submerged culture using headspace solid-phase microextraction.

In this work a headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography-mass spectrometry (GC-MS) and GC-olfactometry (GC-O) was developed to evaluate the profile of the volatile compounds that contribute to the aroma of Antrodia camphorata in submerged culture. For this purpose, the HS-SPME sampling method for the volatile compounds of A. camphorata in submerged culture was optimised by a D-optimal design.

Further studies on the hepatoprotective effect of Antrodia camphorata in submerged culture on ethanol-induced acute liver injury in rats.

To further understand the hepatoprotective activity of Antrodia camphorata in living systems and the possible mechanisms of this protection, the effects of fractions from A. camphorata in submerged culture on the liver and its antioxidative system in acute ethanol intoxicated rats were investigated. The results showed that the ethanolic extract (Fr-I) of A.

[Ozonation of odorous organic compounds in eutrophic water].

Ozonation was applied to investigate the removal efficiency of 6 odorous organic compounds in eutrophic water from Taihu Lake (Wuxi). The results showed that the ozonation process could be described by first order kinetic model and the overall kinetic rates of the odorous compounds were determined by their chemical characteristic and structure, which could be ranked: beta-Ionone (3.3 x 10(-3) s(-1)) > beta-Cyclocitral (2.

Paclitaxel production using co-culture of Taxus suspension cells and paclitaxel-producing endophytic fungi in a co-bioreactor.

The co-culture of the suspension cells of Taxus chinensis var. mairei and its endophytic fungi, Fusarium mairei, in a 20-L co-bioreactor was successfully established for paclitaxel production. The co-bioreactor consists of two-unit tanks (10 L each) with a repairable separate membrane in the center, culturing Taxus suspension cells in one tank and growing fungi in another.

Interactions of Taxol-producing endophytic fungus with its host (Taxus spp.) during Taxol accumulation.

Endophytic fungi (Fusarium mairei) culture broth (EFCB) was added to cell suspension cultures of Taxus cuspidata. After 5 days, cultures of T. cuspidata given 4 ml of EFCB produced a maximal yield of 6.

[Rapid determination of volatile flavor compounds in soy sauce using head space solid-phase microextraction and gas chromatography-mass spectrometry].

A rapid and simple method was developed for the determination of volatile flavor compounds (VFCs) in soy sauce by head space solid-phase microextraction (HS-SPME) coupled to capillary gas chromatography-mass spectrometry (GC-MS). Five types of SPME fibers, including 85 microm PA, 100 microm PDMS, 75 microm CAR/PDMS, 65 microm PDMS/DVB, 50 microm DVB/CAR/PDMS were investigated. Three parameters for HS-SPME in terms of adsorption time, salt concentration, and extraction temperature were optimized.

Study on the structure-activity relationships of phoxalone and induction of apoptosis in H446 tumor cells.

A novel macrolide with dioxa and double ring pentadecanone, named as phoxalone, isolated from the culture broth of a myxobacterium Sorangium cellulosum WXNXJ-C, was well investigated. The chemical structure of Phoxalone was elucidated by spectroscopic analysis including UV, IR, (1)H NMR, MALDI-TOF-MS, and LC/MS spectra. The results of cytotoxic bioactivities on human non-small lung cancer H446, in vitro, showed that not only did phoxalone express higher antitumor bioactivity than many antitumor drugs, but it also displayed less cytotoxicity to normal human liver L02 cell lines (IC(50), 286 microg mL(-1)).

A myxobacterium strain Sorangium cellulosum AHB125 producing epothilone B and other anticancer substances.

A myxobacterium strain AHB125 belonging to genus Sorangium cellulosum was isolated from Anhui area in China and identified with morphological analysis by electron microscopy and phase contrast microscope according to Bergey's manual of systematic bacteriology (8th Ed.). Its high-antitumor bioactivity metabolites was evaluated by bioassay-directed screening technique with B16 tumor cell line etc.

Phoxalone, a novel macrolide from Sorangium cellulosum: structure identification and its anti-tumor bioactivity in vitro.

A novel macrolide, isolated from the myxobacteria Sorangium cellulosum WXNXJ-C, was identified as 1,7,12,13-tetrahydroxy-14-methoxy-8,10-dimethyl-6-phenyl-5,15-dioxa-bicyclo[9.3.1]pentadecan-4-one, "Phoxalone".

Protective effects of mycelia of Antrodia camphorata and Armillariella tabescens in submerged culture against ethanol-induced hepatic toxicity in rats.

The hepatoprotective effects of the mycelia of Antrodia camphorata and Armillariella tabescens were evaluated in vivo using acute ethanol-intoxicated rats as an experimental model. Animals were orally treated with Antrodia camphorata (0.5 or 1.

[Inhibitory effect of weikangfu recipe on growth of mouse S180 tumor and its apoptotic induction].

Objective: To study the growth inhibition of Weikangfu recipe on S180 tumor and its apoptotic induction.

Method: S180-bearing mice were orally administrated with different dosages of Weikangfu recipe, and the growth inhibition was evaluated; apoptotic cells induced were detected by flow cytometry and DNA agarose gel electrophoresis.

Result: Weikangfu recipe showed significant inhibition on the growth of S180 tumor in a dose-dependent manner, compared with the control group.

Decolorization of a dye industry effluent by Aspergillus fumigatus XC6.

The strain Aspergillus fumigatus XC6 isolated from mildewing rice straw was evaluated for its ability to decolorize a dye industry effluent. The strain was capable of decolorizing dyes effluent over a pH range 3.0-8.

[Studies on active substance of anticancer effect in Polygonum cuspidatum].

Objective: To supply the scientific basis of research and development of the medicinal value of Polygonum cuspidatum.

Methods: One composition was isolated from the roots of Polygonum cuspidatum by cytotoxicity based fractionation and identified by HPLC-MS, UV scanning and IR. The inhibition and morphology of L-02, Hep G2, SHZ-888, MCF-7, MCF-7/ADM cells growth caused by this composition was determined by MTT assay and HE dyeing.

Preparation of a chemically sulfated polysaccharide derived from Grifola frondosa and its potential biological activities.

This report describes the preparation, characterization and potential biological activities of a chemically sulfated polysaccharide (S-GAP-P), which was derived from water-insoluble polysaccharide of Grifola frondosa mycelia. S-GAP-P was determined to be a glucan sulfate with the average molecular weight of 28 kDa and the sulfur content of 16.4%.

Determination of ochratoxin A by polyclonal antibodies based sensitive time-resolved fluoroimmunoassay.

Using indirect competitive time-resolved fluoroimmunoassay (TRFIA), a rapid, highly selective and extremely sensitive method has been established for the determination of ochratoxin A (OA). Tests can be performed in a 96-well microplate using the toxin-specific polyclonal antibodies, obtained from rabbits immunized with ochratoxin A-keyhole limpet's hemocyanin (OA-KLH). In indirect TRFIA format, ochratoxin A-bovine serum albumin conjugate (OA-BSA) is coated onto the microtitre plate and incubated with standard toxin (samples) and anti-OA antibody.

Analysis of the resveratrol-binding protein using phage-displayed random peptide library.

Resveratrol, a plant polyphenol, is found in significant amounts in the skin of grapes and in some traditional herbs. It is reported to exert different biological activities, such as inhibiting lipid peroxidation, scavenging free radicals, inhibiting platelet aggregation, and anticancer activity. In order to screen the resveratrol-binding proteins, we synthesized biotinylated resveratrol, purified by liquid chromatography and immobilized it into streptavidin-coated microplate wells.

Antitumor and immunomodulatory effects of weikangfu granule compound in tumor-bearing mice.

Background: Weikangfu granule compound (WKC) is a drug preparation based on a clinical prescription drug, Weikangfu-tang, which has been found to have therapeutic effects on gastric cancer. WKC comprises 7 components, including polysaccharides, saponin, flavonoids, and essential oil.

Objective: The purpose of this study was to assess the antitumor and immunomodulatory effects of WKC in a tumor-bearing rodent model.

Responses of antioxidant enzyme and photosynthesis in rape seedling to the combined stresses of acid rain and ultraviolet-B radiation.

Effects of the simulated acid rain (AR) and ultraviolet-B (UV-B, 280-320 nm) radiation with a single or two ways simultaneously (AR + UV-B) on the antioxidant enzyme and photosynthesis of the rape seedlings were investigated by the hydroponic culture. The results of static experiment indicated that the tolerance of rape seedling to single stress (AR or UV-B) is stronger than that to dual stresses (AR + UV-B). Furthermore, the dual stresses had additive effect on catalase activity, and a synergistic effect on MDA content, net photosynthesis rate, water use efficiency as well as intercellular CO2 concentration.

Effects of cerium on growth and physiological mechanism in plants under enhanced ultraviolet-B radiation.

Effect of cerium (Ce3+) on the growth, photosynthesis and antioxidant enzyme system in rape seedlings (Brassica juncea L.) exposed to two levels of UV-B radiation (T1: 0.15 W/m2 and T2: 0.

[Identification and mode of action of a xylanase A purified from the culture filtrate of Bacillus pumilus WL-11].

Microbial xylanases have received a great deal of attention in the last two decades for their potential applications in food, paper making and animal feed industries. Bacillus pumilus WL-11 was identified as a producer of alkane xylanase free of cellulase after screening soil samples of paper-making factories. The xylanase A (XylA) was purified to homogeneity from the culture filtrate of Bacillus pumilus WL-11 by (NH4) 2SO4 precipitation, CM-Sephadex and Sephadex G-75 chromatographies.

Characterization and gene cloning of a novel beta-mannanase from alkaliphilic Bacillus sp. N16-5.

An alkaline beta-mannanase was purified to homogeneity from a culture broth of alkaliphilic Bacillus sp. N16-5. The enzyme had optimum activity at pH 9.