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1

Effects of irrigation and nitrogen management on the growth and nitrogen concentration of paddy soil and rice plants

100%
Guan W., Zhao X., Li Y.
Polish Journal of Environmental Studies
|
2020
|
tom 29
|
nr 6
2

Carbon stocks of coastal wetland ecosystems on Hainan Island, China

100%
Gao T., Ding D., Guan W., Liao B.
Polish Journal of Environmental Studies
|
2018
|
tom 27
|
nr 3
Coastal wetland ecosystems have a great capacity to store carbon (C), and the condition has a significant influence on carbon emissions and segregation. This study aims to estimate carbon stocks in both vegetation and soil of coastal wetland ecosystems, and to compare the C stocks of different ecosystems and soil layers. This study classified coastal wetland ecosystems into six types, and C stocks were quantified through the measurement of vegetation biomass and soil C. The C stocks of estuaries, muddy beaches, coastal saltwater lakes, mangroves, deltas, and seagrass beds were 210.73, 243.00, 167.41, 426.57, 185.88, and 297.85 MgC ha⁻¹, respectively. Mangroves were found to be the most carbon-rich ecosystem. The total organic C content (TOC) of soil decreased with soil depth and was the highest in the top 0-20 cm layer. The total C storage of coastal wetland ecosystems in Hainan Island was 56.51×10⁵ Mg of C. These estimates show that there is an urgent requirement to protect coastal wetland ecosystems.
3

Naturally occurring aesculetin coumarin exerts antiproliferative effects in gastric cancer cells mediated via apoptotic cell death, cell cycle arrest and targeting PI3K/AKT/M-TOR signalling pathway

100%
Zhang J., Feng M., Guan W.
Acta Biochimica Polonica
|
2021
|
tom 68
|
nr 1
4

Water conservation and nitrogen loading reduction effects with controlled and mid-gathering irrigation in a paddy field

88%
Li Y., Shao X., Sheng Z., Guan W., Xiao M.
Polish Journal of Environmental Studies
|
2016
|
tom 25
|
nr 3
Rice is a widely cultivated crop in China and needs a large quantity of water during its entire growth period. Many water-saving irrigation techniques have been developed and widely applied to conserve water in paddy fields in recent years. A controlled and mid-gathering irrigation (CMI) regime is one of them, of which the main feature is to maximize the use of rainwater different from the others. The objective of this study was to assess and verify the water conservation and nitrogen pollution reduction effects of CMI in comparison with a conventional irrigation (CVI) regime. Results showed that the CMI method had potential for water conservation by reducing total irrigation amount and irrigation frequency and making better utilization of rainwater during the rice growth stage. By making use of irrigation water more efficiently, CMI showed higher irrigation water use efficiency and rainfall use efficiency. CMI can also reduce nitrogen pollution emitted to the water system by reducing the pollutant discharge rather than the pollutant concentration during a storm event. However, the irrigation regime’s effect on pollutant loading reduction was not as significant as fertilizer according to experiment results. Thus, the controlled and mid-gathering irrigation regime was favorable for water conservation and reducing emissions of non-point source pollution.
5

Nitrogen-decreasing and yield-increasing effects of combined applications of organic and inorganic fertilizers under controlled irrigation in a paddy field

76%
Li Y., Shao X., Guan W., Ren L., Liu J., Wang J., Wu Q.
Polish Journal of Environmental Studies
|
2016
|
tom 25
|
nr 2
Inadequate fertilization may result in water pollution and nutrient leaching, especially in paddy fi elds. It is expected that the combination of organic and inorganic fertilizers reduces water pollution in addition to crop yield improvement. In this study, combined fertilization with organic and inorganic fertilizers was tested under controlled irrigation conditions. With the addition of organic fertilizer, the pH of paddy soil could be maintained in a rather neutral environment, and the soil organic matter concentration could increase – especially under a controlled irrigation regime. Hydrolyzed nitrogen was noticed in the fertilized plots with an increasing trend compared to unfertilized plots. However, available phosphorus concentration decreased in all treatments after rice harvest. During the drainage process, the ammonium nitrogen was the main form of nitrogen loss. Organic fertilizer application signifi cantly improved productive panicles and thus increased paddy yield. We concluded that with the combination of organic-inorganic fertilizer application and controlled irrigation, the pollutants can be removed to some extent and the rice yield can be increased signifi cantly, which is favorable for environmental protection and yield promotion.
6

Betaine improves polymer-grade D-lactic acid production by Sporolactobacillus inulinus using ammonia as green neutralizer

76%
Lv G., Che C., Li L., Xu S., Guan W., Zhao B., Ju J.
Polish Journal of Microbiology
|
2017
|
tom 66
|
nr 2
The traditional CaCO₃-based fermentation process generates huge amount of insoluble waste. To solve this problem, we have developed an efficient and green D-lactic acid fermentation process by using ammonia as neutralizer. The 106.7 g/l of D-lactic acid production and 0.89 g/g of consumed sugar were obtained by Sporolactobacillus inulinus CASD with a high optical purity of 99.7% by adding 100 mg/l betaine in the simple batch fermentation. The addition of betaine was experimentally proven to protect cells at high concentration of ammonium ion, increase D-lactate dehydrogenase specific activity and thus promote the production of D-lactic acid.
7

Phylogenic analysis of Chinese Leishmania isolates based on small subunit ribosomal RNA (SSU rRNA) and 7 spliced leader RNA (7SL RNA)

76%
Guan W., Cao D.-P., Sun K., Xu J.-N., Zhang J.-R., Chen D.-L., Chen J.-P.
Acta Parasitologica
|
2012
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tom 57
|
nr 2
The leishmaniases are zoonotic diseases caused by protozoan parasites of the genus Leishmania. Leishmaniases are still endemic in China, especially in the west and northwest froniter regions. To revalue the preliminary phylogenetic results of Chinese Leishmania isolates, we amplified partial fragment of small subunit ribosomal RNA (SSU rRNA) and 7 spliced leader RNA (7SL RNA), then tested the phylogenetic relationships among Chinese Leishmania isolates and their relatives by analyzing SSU rRNA gene sequences and 7SL RNA gene sequences. 19 SSU RNA sequences and 9 7SL RNA sequences were obtained in our study, then analyzed with 42 SSU RNA sequences and 32 7SL RNA sequences retrieved from Genbank, respectively. In the Bayesian analysis of the SSU RNA gene, the isolate MHOM/CN/93/GS7 and the isolate IPHL/CN/77/XJ771 are members of Leishmania donovani complex, while the isolate MHOM/CN/84/JS1 clustered with Leishmania tropica. The other 11 Chinese Leishmania isolates (MHOM/CN/90/WC, MCAN/CN/90/SC11, MHOM/CN/80/XJ801, MHOM/CN/85/GS4, MHOM/CN/84/SD1, MCAN/CN/86/SC7, MHOM/CN/54/#3, MHOM/CN/83/GS2, MHOM/CN/90/SC10H2, MHOM/CN/89/GS6 and MHOM/CN/ 89/GS5) form an unclassified group, defined as Leishmania sp., and the most relative species to this group is L. tarentolae. In the Bayesian analysis of the 7SL RNA gene, 9 Chinese Leishmania isolates also formed an unclassified group with L. tarentolae, including canine isolate 10, MHOM/CN/85/GS4, MHOM/CN/84/SD1, MCAN/CN/86/SC7, MHOM/CN/54/#3, MHOM/ CN/83/GS2, MHOM/CN/90/SC10H2, MHOM/CN/89/GS6 and MHOM/CN/89/GS5. We concluded that: (1) Chinese Leishmania isolates are non-monophyly group; (2) an unclassified group may exist in China, and the most relative species to this group is L. tarentolae; (3) MHOM/CN/84/JS1, which was previously assigned as L. donovani, was most genetically related to L. tropica strain MHOM/SU/74/K27.
8

Impact of packaging materials on bruise damage in kiwifruit during free drop test

76%
Xia M., Zhao X., Wei X., Guan W., Wei X., Xu C., Mao L.
Acta Physiologiae Plantarum
|
2020
|
tom 42
|
nr 07
9

Variations of sediment archaea communities in different distribution areas of Bruguiera gymnoihiza Mangrove in Dongzhaigang, China

64%
Li W., Guan W., Chen H., Liao B., Hu J., Rui J., Peng C., Zhu D., He Y., Tian J.
Polish Journal of Environmental Studies
|
2019
|
tom 28
|
nr 5
Archaea communities widely exist in mangrove forest sediments, but their spatial variations among different distribution areas with salinity gradient in mangrove forest sediments is not well understood. This study used 16S rRNA Miseq sequence to investigate the sediment archaeal community structure and diversity of Bruguiera gymnoihiza mangrove forest in China along three different distribution areas. The results showed rich methanogen and ammonia-oxidizing archaea resources in the study site, with Methanobacterium, Methanothrix, Methanomassiliicoccus, Nitrosopumilus and Nitrososphaera (>1%) as the dominant genera. Mantel test and Redundancy analysis (RDA) results revealed that pH was the determinant for archaeal community structure in our study. The RDA result showed that the available K also contributed to archaeal community structure. There was a significant and positive relationship between pH and available P; in addition, the two values were significantly and negatively related to the observed OTU number. These results suggested that pH is the main determinant of the archaeal community structure and diversity in distribution areas of Bruguiera gymnoihiza in Dongzhaigang.
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