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| 1 | Soil microorganisms alleviate the allelopathic effect of Eucalyptus grandis × E. urophylla leachates on Brassica chinensis显示文摘Soil microbes may be critical players in determining the allelopathic potential of some plants. Low levels of plant community biodiversity in Eucalyptus plantations have been attributed to the allelopathic potential of these tree species. The role of soil microbes in the allelopathic effect of leaf leachates of the hybrid tree Eucalyptus grandis×E.urophylla, was tested in Petri dish assays with Brassica chinensis as a receiver plant. Soils were collected from either a local garden(soil A) or a Eucalyptus plantation(soil B) and half of each soil was sterilized to remove microbes.These soils were then treated with E. grandis×E. urophylla leachates for 0–72 h. Seed germination of B. chinensis was significantly inhibited in soils treated with leaf leachates relative to untreated soils. The inhibitory effect of the leaf leachates was more pronounced in sterilized soils. Total phenolic content was obvious lower in nonsterile leachatetreated soils than in sterile soils. Biomass of B. chinensis was negatively correlated with the total phenolic content in soils.Our findings suggest that soil microbes can alleviate the allelopathic potential of Eucalyptus and thereby its negative impact on plant growth. | Fenglai Lu Lilang Zheng Yueyuan Chen Dianpeng Li Rensen Zeng Huashou Li | 2017 | Journal of Forestry Research2017，28，6： | 6 |
| 2 | Optical properties of estuarine dissolved organic matter isolated using cross-flow ultrafiltration显示文摘Dissolved organic matter(DOM) from freshwater, mid-salinity, and seawater endmember samples in the Jiulong River Estuary, China were fractionated using cross-flow ultrafiltration with a 10-kDa membrane. The colloidal organic matter(COM; 10 kDa–0.22 μm) retentate, low molecular weight(LMW) DOM(<10 kDa) permeate, and bulk samples were analyzed using absorption spectroscopy and three-dimensional fluorescence excitation-emission-matrix spectroscopy. The UV-visible spectra of COM were very similar to those obtained for permeate and bulk samples, decreasing monotonically with increasing wavelength. Most of the chromophoric DOM(CDOM, expressed as the absorption coefficient a355) occurred in the LMW fraction, while the percentage of CDOM in the colloidal fraction was substantially higher in the freshwater endmember(13.4% of the total) than in the seawater endmember(6.8%). The bulk CDOM showed a conservative mixing behavior in the estuary, while there was removal of the COM fraction and a concurrent addition of the permeate fraction in the mid-salinity sample, implying that part of the colloidal CDOM was transformed into LMW CDOM. Two humic-like components(C1: <250, 325/402 nm; and C2: 265, 360/458 nm) and one protein-like component(C3: 275/334 nm) were identified using parallel factor analysis. The contributions of the C1, C2, and C3 components of the COM fraction to the bulk sample were 2.5%–8.7%, 4.8%–12.6%, and 7.4%–14.7%, respectively, revealing that fluorescent DOM occurred mainly in the LMW fraction in the Jiulong River Estuary. The C1 and C2 components in the retentate and permeate samples showed conservative mixing behavior, but the intensity ratio of C2/C1 was higher in the retentate than in the permeate fractions for all salinity samples, showing that the humic component was more enriched in the COM than the fulvic component. The intensity ratio of C3/(C1+C2) was much higher in the retentate than in the permeate fraction for mid-salinity and seawater samples, revealing that the protein-like component was relatively more enriched in COM than the humic-like component. The contribution of the protein-like component(C3) to the total fluorescence in the retentate increased from 14% in the freshwater endmember to 72% for the seawater endmember samples, clearly indicating the variation of dominance by the humic-like component compared to the protein-like component during the estuarine mixing process of COM. | YI Yueyuan ZHENG Airong GUO Weidong YANG Liyang CHEN Ding | 2014 | Acta Oceanologica Sinica2014，33，4： | 6 |
| 3 | VirusMap:A visualization database for the influenza A virus显示文摘Influenza A virus,a highly virulent pathogen that has caused several pandemic events over the course of human history,still remains a major threat to human health at present.The most serious influenza pandemic in recorded history was the 1918 Spanish flu outbreak,which killed about 20-100 million people worldwide(Murray et al.,2006).Also,the H5N1 virus was known for its | Yubin Xie Xiaotong Luo Zhihao He Yueyuan Zheng Zhixiang Zuo Qi Zhao Yanyan Miao Jian Ren | 2017 | Journal of Genetics and Genomics2017，44，5： | 0 |
| 4 | Concentration Profiling of Fluorine in F-doped SnO_(2) Film显示文摘Depth profiles of fluorine in F-doped tin oxide(FTO)films prepared by atmospherical pressure chemical vapour deposition method have been studied by use of ^(19)F(p,αγ)^(16)O resonance nuclear reactions near 872.1 keV.A proper convolution method was used to get the real depth profiles of fluorine from the measured y-ray excitation curves.Secondary ion mass spectrometry in conjunction with Rutherford backscattering spectrometry analysis was used to determine the density of the FTO films.It was found that the density of the films is markedly different from an earlier reported value. | XU Bingzhang XIA Yueyuan TAN Chunyu CHEN Youpcng LI Shuying ZHENG Zongshuang JIANG Weilin | 1992 | Chinese Physics Letters1992，9，7： | 0 |
| 5 | Asponchimides A−E: new enantiomeric N-acetyldopamine trimers from Aspongopus chinensis显示文摘Five new racemic N-acetyldopamine (NADA) trimers, asponchimides A−E ( 1 − 5 ), were isolated from Aspongopus chinensis, a prominent traditional Chinese medicinal insect employed for alleviating pain, treating indigestion, and addressing kidney ailments. Compounds 1 − 5 were successfully resolved by chiral high-performance liquid chromatography (HPLC), yielding five pairs of enantiomers: (+)- and (−)-asponchimides A−E ( 1a / 1b − 5a / 5b ). Their structural identities were discerned by extensive spectroscopic analyses, including high-resolution mass spectrometry (HRMS), ultraviolet-visible (UV-Vis) spectroscopy, infrared (IR) spectroscopy, and nuclear magnetic resonance (NMR), and their absolute configurations were determined by electronic circular dichroism (ECD) calculations. Compounds 1 − 5 are pioneering instances of NADA trimers featuring a Δ7 double bond. When subjected to a series of bioassays, a majority of the compounds exhibited weak inhibitory activity against nitric oxide (NO) production in LPS-induced RAW 264.7 cells. | NIE Jinchun MEI Fang ZHENG Yueyuan WEN Qiuyi LI Zhenwei ZHANG Daidi LI Wei GUO Dean | 2023 | Chinese Journal of Natural Medicines2023，21，11： | 0 |
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