Publications by authors named "Song Wei-Wei"

Cyanthillium cinereum, which belongs to the family of Asteraceae, is an annual or perennial herbaceous plant with significant medicinal uses for treating colds and fever. During September to November of 2020, C. cinereum showing symptoms of witches'-broom were found in economic forests distributed in Ding'an, Hainan Province of China, with 20% incidence.

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Post-hepatectomy liver failure (PHLF) is a potentially life-threatening complication following liver resection. Hepatocellular carcinoma (HCC) often occurs in patients with chronic liver disease, which increases the risk of PHLF. This study aimed to investigate the ability of the combination of liver function and fibrosis markers (ALBI score and FIB-4 index) to predict PHLF in patients with HCC.

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  • Praxelis clematidea is an invasive herbaceous plant found in Hainan Province, China, exhibiting severe witches'-broom symptoms indicative of a phytoplasma infection.
  • Researchers collected and analyzed samples from symptomatic and asymptomatic plants, confirming that the symptomatic plants tested positive for phytoplasma using direct PCR amplification of specific gene sequences.
  • The gene sequences obtained were identical and closely related to strains linked to major plant diseases, with a 100% identity match to specific 'Candidatus Phytoplasma asteris' strains, and were deposited in Genbank for further study.
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Phytoplasmas are phloem-limited plant pathogenic prokaryotes which can not be cultured in vitro. The pathogens could cause various plant symptoms such as witches'-broom, virescence, and leaf yellows. Ipomoea obscura is a valuable plant species belonging to the family Convolvulaceae, mainly used as a traditional Chinese medicine used to treat diseases such as dehydration and diuresis.

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Chinaberry (Melia azedarach), belonging to the family of Meliaceae, is an ornamental tree distributes across southern of China. In the autumn of 2021, In an area of 400 acres located in Wanning city of Hainan Province, a tropical island in China, with coordinates of 110°28'42.72″E, 19°2'9.

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  • Alocasia macrorrhiza, a significant landscape and medicinal plant in China, showed 40% symptomatic incidence of yellowing and wilting leaves on Hainan Island in 2022.
  • Symptoms were linked to a phytoplasma pathogen, leading researchers to collect samples for DNA analysis.
  • Through PCR amplification and sequencing, the associated phytoplasma was classified as Alocasia macrorrhiza yellows (AmY) with identical sequences, confirming its identity in GenBank.
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  • Palm is a key cash crop in Hainan Island, China, but is severely impacted by palm yellow leaf (AcYL) disease caused by phytoplasmas.
  • The study identified AcYL phytoplasmas as related to 'Phytoplasma malaysianum' from the 16SrXXXII-D subgroup, demonstrating 100% genetic similarity among the strains.
  • A new subgroup, 16SrXXXII-F, was proposed based on genetic analysis, which could help in understanding and managing the spread of AcYL disease in palm plants.
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  • Manganese ion (Mn(II)) in natural waters enhances the oxidation of various compounds like bisphenol A (BPA) when combined with iron species (Fe(VI)), achieving higher oxidation rates compared to using Fe(VI) alone.
  • At specific molar ratios of Mn(II) to Fe(VI), different reactive species of iron and manganese play distinct roles in the oxidation process, particularly increasing the effectiveness of BPA degradation.
  • Further analysis showed that as the ratio of Mn(II) to Fe(VI) increased, the contribution of reactive manganese species (Mn(VII) and Mn(III)) to the oxidation of BPA became more significant, indicating a shift in the oxidation mechanism.
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  • Researchers explored the effects of transcranial magnetic stimulation (TMS) combined with citalopram on patients with post-stroke depression (PSD).
  • In a study of 100 patients divided into two groups, the TMS group showed significantly reduced depression scores and improved cognitive performance compared to the control group receiving only citalopram.
  • The findings suggest that combining TMS with citalopram provides enhanced treatment for PSD without a notable increase in side effects.
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Coconut lethal yellowing (LY) diseases caused by phytoplasmas are devastating diseases for coconut cultivation and seriously threaten the coconut industry around world. The phytoplasmas associated with the LY diseases belonged to six 16Sr groups containing 16SrI, 16SrIV, 16SrXI, 16SrXIV, 16SrXXII, and 16SrXXXII with comparatively higher variable levels. Conserved regions of the 16S rRNA genes of LY phytoplasmas belonging to the six 16Sr groups were obtained in the study.

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  • The study identified and characterized pathogens linked to Huanglongbing symptoms in citrus crops on Hainan Island, focusing on phytoplasma and Liberibacter asiaticus.
  • Detection methods included analyzing gene fragments specific to these pathogens, revealing mixed infections and specific subgroups of phytoplasmas present in diseased plants.
  • This research marks the first report of 16SrII-V and 16SrXXXII-D subgroup phytoplasmas infecting citrus in China, as well as instances of co-infection with Liberibacter asiaticus.
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Carica papaya Linn, belonging to the Caricaceae family, is an economic and medicinal plant, which is widely cultivated in tropical and subtropical countries (Soib et al., 2020). Beginning in 2021, abnormal symptoms of Carica papaya exhibiting leaf yellow, crinkle and leaflet were found in Wanning city of Hainan Province, China.

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Gas/particle (G/P) partitioning is an important behavior for the atmospheric transport of polycyclic aromatic hydrocarbons (PAHs). In this study, paired daytime and nighttime air samples were collected for one year in order to study the diurnal and nocturnal variations of concentration and G/P partitioning of PAHs. Higher PAHs concentrations in total phase were observed in nighttime.

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  • Gas/particle (G/P) partitioning plays a crucial role in determining the environmental behavior of semi-volatile organic compounds (SVOCs), particularly polycyclic aromatic hydrocarbons (PAHs).
  • The study developed simple equations to predict the G/P partitioning quotient (K) of PAHs over a temperature range from -21 °C to 34 °C, validated against global monitoring data.
  • Identified deviations in previous models suggest the need for further research on the mechanisms influencing G/P partitioning of PAHs, highlighting the importance of including additional factors in future modeling efforts.
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  • - The study focuses on the increasing concern about human exposure to particulate novel brominated flame retardants (NBFRs) and the lack of reliable methods to determine their inhalation intake based on size distribution.
  • - Researchers developed a new equation to predict the gas/particle (G/P) partitioning behavior of NBFRs, analyzing concentrations from numerous samples to understand how these compounds behave in different particle sizes.
  • - The findings reveal that inhalation intake of particulate NBFRs can exceed that of gaseous forms under certain conditions, highlighting the significant influence of temperature and total suspended particle concentration on exposure risks.
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Melochia corchorifolia L. is a plant belonging to the family Sterculiaceae, extracts from this plant have been reported to inhibit melanogenesis (Yuan et al., 2020).

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Emilia sonchifolia is a medical plant belonging to the family of Asteraceae, mainly used as a traditional Chinese medicine with the function of anti-inflammatory, analgesic, antibacterial and so on. During October to November 2020, the plants showing abnormal symptoms including witches'-broom, internode shortening, leaf chlorosis and leaflet were found in Hainan province, a tropical island of China. The total DNA of the plant samples were extracted using 0.

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  • * It highlights that sludge contains a mix of high and low molecular weight PAHs, with an estimated release of over 100 kg of these compounds annually from the studied WWTPs.
  • * The study suggests that sewage sludge is a significant medium for environmental pollutant transfer, urging the need for increased attention to the presence and impact of PAHs and Me-PAHs.
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Polycyclic aromatic hydrocarbons (PAHs), 33 methylated PAHs (Me-PAHs), and 14 nitrated PAHs (NPAHs) were measured in wastewater treatment plants (WWTPs) to study the removal efficiency of these compounds through the WWTPs, as well as their source appointment and potential risk in the effluent. The concentrations of ∑PAHs, ∑Me-PAHs, and ∑NPAHs were 2.01-8.

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  • - Tephrosia purpurea, a medicinal plant with notable insecticidal properties, has been affected by a disease inducing symptoms like witches'-broom and leaf chlorosis, found to be prevalent in Hainan Province, China, with an incidence of about 60%.
  • - The disease is suspected to be caused by phytoplasma, a non-culturable prokaryotic pathogen that leads to significant economic and ecological challenges, especially in agriculture.
  • - Researchers extracted DNA from symptomatic and asymptomatic plants, successfully identifying specific gene sequences from the diseased samples, which were linked to a new strain of phytoplasma named Tephrosia purpurea witches'-broom (TpWB) that belongs to
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  • Waltheria indica L. is a medicinal plant from the Sterculiaceae family, used in China for treating rheumatism and pain, but it has recently shown signs of disease in Hainan province, with a 70% incidence affecting its growth.
  • The symptoms, including virescence and chlorosis, suggest infection by phytoplasma, a pathogen that cannot be cultured in vitro, leading to ecological and financial consequences.
  • DNA testing confirmed the presence of phytoplasma in symptomatic plants via PCR, identifying a new strain named Waltheria indica virescence (WiV), with high genetic similarity to other known phytoplasmas like the Onion yellows strain.
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Trema tomentosa (Roxb.) Hara belonging to Ulmaceae displayed abnormal symptoms including witches'-broom, internode shortening, leaf chlorosis and leaflet that affected seriously their growth causing financial loss and ecological damage in China. During August through September 2020, these plants with the symptoms were first found and collected in Dingan and Qinghai counties of Hainan province, China.

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The logarithm of gas/particle (G/P) partition quotient (logK) has been found to have a linear relationship with logK (octanol-air partition coefficient) with slope m and intercept b and logP (subcooled liquid vapor pressure) with slope m and intercept b. In the sister paper of the present work, analytical equations to predict the slope m and intercept b based on logK and predict the slope m and intercept b based on logP are developed using steady state theory. In this work, the equations are evaluated using world-wide monitoring data (262 pairs for m and b values and 292 pairs for m and b values produced from more than 10,000 monitiring data worldwide) for selected seven groups of semi-volatile organic compounds (SVOCs), including polybrominated diphenyl ethers (PBDEs), polychlorinated dibenzo-p-dioxins and polychorinated dibenzofurans (PCDD/Fs), polyclorinated biphenyl (PCBs), polycyclic aromatic hydrocarbons (PAHs), polychlorinated naphthalenes (PCNs), organochlorinated pesticides (OCPs), novel brominated flame retardants (NBFRs), and other selected halogenated flame retardants.

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Areca palm yellow leaf (AYL) disease caused by the 16SrI group phytoplasma is a serious threat to the development of the Areca palm industry in China. The 16S rRNA gene sequence was utilized to establish a rapid and efficient detection system efficient for the 16SrI-B subgroup AYL phytoplasma in China by loop-mediated isothermal amplification (LAMP). The results showed that two sets of LAMP detection primers, 16SrDNA-2 and 16SrDNA-3, were efficient for 16SrIB subgroup AYL phytoplasma in China, with positive results appearing under reaction conditions of 64oC for 40 min.

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Pericampylus glaucus is an important medicinal plant resource containing active components with potential antitumor activity in China (Zhao & Cui, 2009). During July through August 2020, plants displayed disease symptoms including "witches' broom", leaf chlorosis, leaflet and internode shortening that impacted their growth (Fig. 1).

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