Limimaricola litoreus sp. nov., isolated from intertidal sand of the Yellow Sea.

A novel species of the genus Limimaricola, designated ASW11-118T, was isolated from an intertidal sand sample of the Yellow Sea, PR China. Growth of strain ASW11-118T occurred at 10-40 °C (optimum, 28 °C), pH 5.5-8.5 (optimum, pH 7.5) and with 0.5-8.0 % (w/v) NaCl (optimum, 1.5%). Strain ASW11-118T has the highest 16S rRNA gene sequence similarity to Limimaricola cinnabarinus LL-001T (98.8%) and 98.6 % to Limimaricola hongkongensis DSM 17492T. Phylogenetic analysis based on genomic sequences indicated that strain ASW11-118T belongs to the genus Limimaricola. The genome size of strain ASW11-118T was 3.8 Mb and DNA G+C content was 67.8 mol%. The average nucleotide identity and digital DNA-DNA hybridization values between strain ASW11-118T and other members of the genus Limimaricola were below 86.6 and 31.3 %, respectively. The predominant respiratory quinone was ubiquinone-10. The predominant cellular fatty acid was C18 : 1 ω7c. The major polar lipids were phosphatidylglycerol, diphosphatidylglycerol, phosphatidylcholine and one unknown aminolipid. On the basis of the data presented, strain ASW11-118T is considered to represent a novel species of the genus Limimaricola, for which the name Limimaricola litoreus sp. nov. is proposed. The type strain is ASW11-118T (=MCCC 1K05581T=KCTC 82494T).

Celeribacter litoreus sp. nov., isolated from intertidal sediment.

A Gram-negative, aerobic, non-flagellated and rod-shaped bacterium, strain ASW11-22T, was isolated from an intertidal sediment collected from a coastal area of Qingdao, PR China. The strain grew at 15-40 °C (optimum, 37 °C), at pH 6.0-9.0 (optimum, pH 7.0) and with 0.5-10 % (w/v) NaCl (optimum, 1.0 %). It hydrolysed gelatin and aesculin but did not reduce nitrate to nitrite. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain ASW11-22T belonged to the genus Celeribacter, showing the highest sequence similarity to the type strains of Celeribacter halophilus MCCC 1A06432T (98.20 %) and Celeribacter ethanolicus NH195T (97.84 %). The genomic DNA G+C content was 59.1 mol%. The major cellular fatty acid (>10 %) of the strain was summed feature 8 (C18 : 1 ω7c and/or C18 : 1 ω6c) and its main polar lipids were phosphatidylglycerol and one unidentified aminolipid. The sole respiratory quinone of strain ASW11-22T was ubiquinone-10. On the basis of the polyphasic evidence presented in this paper, strain ASW11-22T represents a novel Celeribacter species, for which the name Celeribacter litoreus sp. nov. is proposed. The type strain is ASW11-22T (=KCTC 82495T=MCCC 1K05584T).

Single longitudinal mode GaAs-based quantum dot laser with refractive index perturbation.

We report on the design, fabrication, and characterization of single longitudinal mode InAs/GaAs quantum dot lasers emitting at the 1.3 µm communication band. The influence of simply etched surface high-order gratings in the ridge of the Fabry-Perot lasers has been studied. A 35th-order surface grating is fabricated by standard photolithography to introduce the refractive index perturbation, which leads to the reduced mirror loss at the desired wavelength and thus realizing single longitudinal mode lasing. Stable single-mode operations are maintained at the injection current range of 45-100 mA with a side-mode suppression ratio up to 33 dB.

Cytotoxic and anti-inflammatory activities of phenanthrenes from the medullae of Juncus effusus L.

Bioactivity guided phytochemical investigation of the ethanol extract of the medullae of Juncus effusus resulted in the isolation of two new phenanthrenes, 8-hydroxymethyl-2-hydroxyl-1-methyl-5-vinyl-9,10-dihydrophenanthrene (1), and 5-(1-methoxyethyl)-1-methyl-phenanthren-2,7-diol (2) together with 15 known phenanthrenoids (3-17). The chemical structures of 1 and 2 were established by a combination of spectroscopic techniques. Compounds 1-15 and 17 were evaluated for their cytotoxic activities against five human cancer cell lines (SHSY-5Y, SMMC-7721, HepG-2, Hela and MCF-7) by CCK-8 assay, and their anti-inflammatory activities were also evaluated by inhibition on NO production in LPS-activated murine macrophage RAW 264.7 cells.

[Chemical constituents from Phellinus igniarius and their anti-tumor activity in vitro].

Eleven compounds were isolated and purified from Phellinus igniarius by column chromatography on silica gel, Sephedax LH-20, RP-8, MCI and preparative TLC. Their structures were identified as 3α-hydroxyfriedel-2-one (1), 3-hydroxyfriedel-3-en-2-one (2), ergosta-4, 6, 8 (14), 22-tetraen-3-one (3), ergosterol peroxide (4), uracil (5), uridine (6), 4-(3, 4-dihydroxyphenyl)-3-butene-2-one (7), protocatechualdehyde (8), inotilone (9), inoscavinA (10) and phellibaumin E (11), respectively, on the basis of NMR and MS data analysis. Among them, compounds 1, 2, 5, and 6 were firstly obtained from this genus. In vitro cytotoxic activity of compounds 1-11 was screened by Cell Titer-GLo Reagent, on 41 human tumor cell strains and 2 hamster normal cell strains via high-throughput screening. Compounds 2-4 exhibit significant cytotoxic activity against NOMO-1 and SKM-1 acute myeloid leukemia cell lines, and compounds 2 and 3 showed good selectivity to NOMO-1 with IC50 values of 0.795 5, 1.828 µmol•L-1and SKM-1 with IC50 values of higher than 10 µmol•L-1. Compound 7 showed remarkable antitumor activities against H526 Human lung cancer cell line, DU145 prostate cancer cell line and HEL erythroleukemia cell line with IC50 values of 0.533 4, 1.885, 1.057 µmol•L⁻¹, respectively. Other compounds had no or weak antitumor effect. In addition, all compounds had no significant effect on hamster normal cell lines CHL and CHO with IC50 values of higher than 10 µmol•L⁻¹, which showed that all compounds had no toxic effect on normal cells.

Four new phenanthrenoid dimers from Juncus effusus L. with cytotoxic and anti-inflammatory activities.

Four new phenanthrenoid dimers, effususins A-D (1-4), were isolated from an ethanolic extract of the medullae of Juncus effuses (Juncaceae). Their structures were elucidated by 1D and 2D NMR spectroscopic analysis and mass spectrometry. Compounds 1-4 was in vitro evaluated for their cytotoxic activities by CCK-8 assay against five human cancer cell lines (SHSY-5Y, SMMC-7721, HepG2, Hela, and MCF-7) and their inhibitory effects on NO production in lipopolysaccharide-activated murine macrophage RAW264.7 cells. Effususin B exhibited moderate to strong cytotoxic activities against the tested cancer cell lines and moderate anti-inflammatory activity.