Publications by authors named "Xian Jun Jiang"

Six new compounds, including two depsidones garciculendepsidones A and B (1 and 2), one prenylated xanthone garciculenxanthone (3) and three dimeric xanthones bigarciculenxanthones A-C (4-6), were isolated from the twigs and leaves of Garcinia esculenta Y. H. Li.

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Two new guaiane-type sesquiterpenes, wenyujinolides A () and B (), were isolated from the ethanol extract of , together with 10 known compounds. Their structures were established by extensive spectroscopic methods (IR, ESIMS, HRESIMS, ECD, 1D and 2D NMR) and comparison of their NMR data with literatures. Compounds and were evaluated for the inhibition of NO production in LPS induced RAW 264.

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To clarify the effect of pH on the structure and functional traits of soil microbial communities in purple soils, three purple upland soils developed from the same parent material that differed in pH were selected as the research objects, and metagenomic shotgun sequencing was used to investigate the structure and functional traits of the microbial communities among different pH soils. The shotgun sequencing identified a total of 89 phyla, 222 classes, 527 orders, 1009 families, 2769 genera, and 14354 species in these soils. Regardless of the phylogenetic classification level, the microbial community structures of these three purple soils with different pHs were significantly different.

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Soil pH is recognized as an important environmental factor in determining the niche differentiation for ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA) communities. Species of comammox, a single microorganism capable of the complete oxidation of ammonia to nitrate, have recently been discovered. Metagenomic analysis and quantitative PCR showed that Comammox were found in a wide range of environments, including soil.

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Phytochemical investigation of Lycopodium cernuum L. afforded seven undescribed serratene triterpenoids named 3β, 21β-dihydroxyserra-14-en-24-oic acid-3β-(5'-hydroxybenzoate) (1), 3β, 21β, 24-trihydroxyserrat-14-en-3β-(5'-hydroxyl benzoate) (2), 3β, 14α, 15α, 21β-tetrahydroxyserratane-24-methyl ester (3), 3β, 14α, 21β-trihydroxyserratane-15α-(4'-methoxy-5'-hydroxybenzoate)-24-methyl ester (4), 3β, 14α, 21β-trihydroxyserratane-15α-(4'-methoxy-5'-hydroxybenzoate) (5), 3β-hydroxy-21β-acetate-16-oxoserrat-14-en-24-oic acid (6), 3β, 21β-dihydroxy-16α, 29-epoxyserrat-14-en-24-methyl ester (7), together with eleven known compounds (8-18), whose chemical structures were elucidated through spectroscopic analysis of HRESIMS, 1D NMR, 2D NMR and comparison between the literature. All compounds were evaluated for their α-glucosidase inhibitory activity for the first time.

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Nitrogen metabolism pathways mediated by microorganisms play an important role in maintaining the structure and functional stability of soil ecosystems. Clarifying the relationships between microbial communities and nitrogen metabolism pathways can expand our understanding of nitrogen metabolism pathways at a microscopic level. However, the horizontal gene transfer of microorganisms means that taxonomy-based methods cannot be easily applied.

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Background: This study assessed the reliability and validity of the modified Unified Classification System for femur fractures after hip arthroplasty.

Methods: Four hundred and two cases were evaluated by 6 observers, 3 experts and 3 trainee surgeons. Each observer read the radiographs on 2 separate occasions and classified each case as to its type.

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Increasing evidence suggests that ammonia oxidation in acidic soils is primarily catalyzed by ammonia-oxidizing archaea (AOA), while ammonia-oxidizing bacteria (AOB) drive ammonia oxidation in neutral and alkaline soils in which AOA overwhelmingly outnumber AOB. Therefore, neutral purple soil with a pH of 7.2 was selected to study the composition of the active ammoxidation microbial community with a stable isotope nucleic acid probe technique combined with cloning sequencing.

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Article Synopsis
  • Two new iboga-type indole alkaloids were identified from the twigs and leaves of the Tabernaemontana divaricata plant.
  • The newly discovered compounds are (3R)-7,19-di-epi-3-methoxytabernoxidine and (3R,19R)-19-hydroxy-3-(2-oxopropyl)voacangine.
  • Their structural identities were confirmed through various scientific methods, including spectroscopic techniques, X-ray diffraction, and circular dichroism analysis.
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Two hitherto unknown highly modified abietane diterpenoids, namely salviapritin A () and salviapritin B (), were isolated from the ethanol extract of , together with 17 known compounds. Their chemical structures were established by extensive spectroscopic methods (ESIMS, HRESIMS, 1D and 2D NMR) and by comparison of their NMR data with those of related analogues. Salviapritin A is the first example of a trinorabietane diterpenoid possessing an acenaphthylene skeleton from the genus.

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Five new polyphenolic derivatives, sepiumols A-E (1-5), were isolated from the root barks of Periploca sepium. Their structures were elucidated by interpretation of NMR spectroscopic and mass spectrometric data. Compounds 1, 3 and 5 were found to exhibit significant antifungal activity, particularly for 3 with the remarkable activity against Gibberella saubinetii and Alternaria longipes with MIC values of 1.

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Four hitherto unknown aristolane-type sesquiterpenes, including one novel 8,9-secoaristolane, namely secoaristolenedioic acid (1), two aristolone derivatives, namely 1α,2β-dihydroxyaristolone (2), 9-epidebilon (3), and one rare aristolane-chalcone hybrid, namely 3'-hydroxynardoaristolone A (4) were isolated from the ethanol extract of the roots and rhizomes of Nardostachys chinensis. Their structures were elucidated on the basis of extensive spectroscopic analysis. In addition, the structure of aristolanhydride, recently isolated from the same species, was corrected by reanalysis of the published NMR data.

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Background: Reconstruction of Myerson type III (defect size more than 5 cm) chronic Achilles tendon ruptures (CATRs) is a surgical challenge due to its large Achilles tendon defect. This study aims to describe our operative technique for Myerson type III CATR and its clinical outcomes.

Patients And Methods: From May 2012 to April 2015, we treated seven patients (6 males, 1 female) with Myerson type III CATR using semitendinosus tendon and gracilis tendon autograft.

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Background: This study assessed the surgical outcomes of Lisfranc injuries accompanied by multiple metatarsal fractures. Metatarsal fractures here refers to metatarsal head, neck, and shaft (including shaft fractures accompanied by fractures of the base) fractures, as well as mixed (i.e.

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The discovery of the complete ammonia-oxidizing microbes, Comammox , had fundamentally changed our perspective on traditional nitrification. The microbe also played a potentially under-appreciated role in the biogeochemical N cycle and provided a new dimension for the research of nitrification. To investigate the abundance of Comammox in different ecosystems was urgently needed.

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Background: The Unified Classification System (UCS) for Periprosthetic femoral fractures (PPFF) still has some limitations.

Methods: We retrieved 18 previous classifications for PPFF based on systematic review of the literature, and also retrospectively analyzed 402 cases with PPFF. 46 cases (11.

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Two new triterpenoids, 3--(4',5'-dihydroxybenzoyl)-lup-20(29)-en () and 3--(6'-desmethysyringyl)-13α-methyl-27-norolean-14-en-3-ol (), were isolated from the leaves and twigs of . Their structures were identified by extensive spectroscopic experiments (NMR and MS) and comparison with literature data. Compounds and exhibited the moderate inhibitory activity against , and Kleb with MIC values from 50 to 25 g/mL, and also displayed the weak activity selectively against tested bacteria strains with MIC values from 100 to 50 g/mL.

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A new pregnane steroid, named aspergillon A (), together with two known compounds, (22,24)-ergosta-5,7,22-trien-3-ol () and (22, 24)-ergosta-4,6,8(14),22-tetraen-3-one () were isolated from cultures of the tin mine tailings-associated fungus . The new structure and absolute configuration were determined with the help of extensive spectroscopic analyses and quantum chemical calculations of the electronic circular dichroism (ECD) spectra.

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Acidic forest peat soil in Xiaoxing'an Mountain was used to investigate the type and key drivers of nitrification by carrying out nitrification incubation after adding 10 mL·L CH and different amounts of (NH)SO(0, 1.2, 6.0 mmol N·kg).

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Six hitherto unknown prenylated 2-phenoxychromones, epimedonin G (1), 7-O-methylepimedonin G (2), and epimedonins H-K (3-6), and two new prenylflavonoids, epimedonin L (7) and 3″-O-desmethylspinorhamnoside (8), were isolated from an ethanol extract of the aerial parts of Epimedium brevicornum. Their structures were established on the basis of spectroscopic data interpretation. Compound 7 exhibited cytotoxic activity when evaluated against four human cancer cell lines (HL-60, A-549, MCF-7, and SW-480), with IC values of <10 μM.

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Article Synopsis
  • Four new isoflavonoids were discovered from different plant sources: three isoflavans and one prenylated isoflavone.
  • Their chemical structures were determined using detailed spectroscopic methods.
  • Compounds 1 and 4 showed minimal cytotoxic effects against five types of human cancer cells.
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Nitrification is the process of microbial oxidation of ammonia to nitrate, completed by the ammonia oxidizers (AOB and AOA) and nitrite oxidizing bacteria (NOB), sequentially. For a century, we have been learning and studying the established two-step process as the unique way for nitrification. According to the kinetic theory, there should be a one-step nitrification in the environment, that is, the whole process of nitrification (from NH to NO) was completed by one microorganism, but no study could give a direct proof for the existence of this microorganism.

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Four hitherto unknown prenylated coumarins, namely 6″-O-β-D-apiofuranosylapterin (1), 4'-O-isobutyroylpeguangxienin (2), 6-(3-methyl-2-oxobutyroyl)-7-methoxycoumarin (3), and 6-hydroxycoumurrayin (4), were isolated from the ethanol extract of Heracleum stenopterum, Peucedanum praeruptorum, Clausena lansium, and Murraya paniculata, respectively. Their chemical structures were established on the basis of extensive spectroscopic analysis. Compound 2 exhibited in vitro cytotoxic activity against five human cancer cell lines (HL-60, A-549, SMMC-7721, MCF-7, and SW-480) with IC values ranging from 15.

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Coastal wetlands contribute about 75% to the global oceanic CH emissions, thus play a vital role in global C cycles. In this paper, we provided a perspective on researches on metabolic, phylogenetic, and ecological diversity of the methanogenic archaea and the regulating environmental factors in coastal wetlands. Because of the presence of more favorable electron acceptors such as sulfate, methanogenesis via CO reduction and acetate fermentation are limited by availability of substrates, and hydrogenotrophic and acetotrophic methanogens generally express low relative abundance.

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Four hitherto unknown 6a,11b-dihydroxypterocarpans, namely pterocarpadiols A-D (1-4), were isolated from the ethanol extract of the twigs and leaves of Derris robusta. Their structures were elucidated on the basis of extensive spectroscopic analysis. Pterocarpadiols A-D are a kind of very rare 6a,11b-dihydroxypterocarpans, and their presence as markers may be helpful in chemotaxonomical classification.

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