Wyniki wyszukiwania

1

Effectiveness of Korean pine (Pinus koraiensis) seed dispersal by small rodents in fragmented and primary forests

100%

Yang Y., Yi X.

Polish Journal of Ecology

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2011

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tom 59

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nr 2

The effectiveness of dispersers on seeds of Korean pine (Pinus koraiensis Siebold et Zuccarini) was investigated in three fragmented stands and one primary stand. The proportion of Korean pine trees was less than 7% in the fragmented stands but more than 90% in primary stand. Five estimates related seed dispersal (proportion of removed seeds, scatter-hoarded seeds, cache dynamics, dispersal distance and microhabitat) were assessed to see the effect of forest fragmentation on the probability of seed dispersal of Korean pine seeds. Our results indicated fast seed harvest of Korean pine by small rodents at the seed stations and no difference among the four stands. Scatter-hoarding rodents were potentially important in promoting natural regeneration of Korean pine as revealed by high proportion of seed removal (up to 50%), short seed lifetime from the seed release locations and lower proportion of seeds remained on the ground surface. Although a proportion of seeds were scatter-hoarded in fragmented stands, no seedling successfully established due to heavy predation. Dispersal distances were strongly left-skewed in fragmented stands, indicating that fragmentation is likely to be disadvantageous for longer distance dispersal. The effective dispersal was suffered from a very heavy cost as accompanied by a great portion of seed predation and lower level of scatter-hoarded seeds. Failing to see seedling establishment in fragmented stands rather than in primary stand indicated that fragmentation and deforestation have negative effects on dispersal behavior and consequently seed destination. Artificial tree plantation and pinecone protection are highly recommended for Korean pine regeneration.

2

Electrochemical properties and pollution remediation mechanism of P-MFC anode under cadmium stress

100%

Yang Y., Shen Q.

Polish Journal of Environmental Studies

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2019

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tom 28

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nr 5

To explore the remediation feasibility of heavy metal pollution in wetland soil using a plant-microbial fuel cell (P-MFC) and the corresponding mechanism, a P-MFC system was constructed with in situ simulations of real wetland environment. By using Typhalatifolia L. as the trial plant, the electrochemical properties of the anode under different cadmium (Cd) concentrations are analyzed by cyclic voltammetry and electrochemical impedance, and the microbial community structure is determined by high-throughput sequencing. The maximum P-MFC output voltage of 546.65 mV and Cd accumulation of 36.461 mg/kg at the Typhalatifolia L. roots are revealed. Cd stress could not only decrease the output voltage and anodic electrochemical activity of the P-MFC system but also affect the accumulation ability of Typhalatifolia L. and the internal resistance and microbial community structure of P-MFC. We find it feasible to apply P-MFC to large-scale heavy metal remediation in wetland soil, but it is critical to consider the tolerance range of pollution stress to achieve the best balance between energy output and environmental restoration.

3

Scatterhoarding of Manchurian walnut Juglans mandshurica by small mammals: response to seed familiarity and seed size

100%

Yi X., Yang Y.

Acta Theriologica

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2011

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tom 56

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nr 2

Dispersal patterns can be affected by seed familiarity and seed traits, including size, mass, and nutritional value, but these factors have not been intensively studied in the context of seed dispersal processes. Our aim was to study how small rodents respond to seed size and seed familiarity in their pattern of Manchurian walnut (Juglans mandshurica) seeds in two different habitats in temperate forests of northeast China. Our results demonstrated that Apodemus penisulae acts as the most important disperser for Manchurian walnut seeds. Inexperienced small rodents did not reject seeds of the Manchurian walnut and show similar seed removal rates as compared with experienced rodents. Both experienced and naïve rodents actively participated in seed scatterhoarding of Manchurian walnut seeds. Consecutive survey showed that seeds with large size/mass were removed faster than those with small size/mass, indicating a preference for large seeds. However, small seeds scatter-hoarded by small rodents were transported farther than large ones, failing to support the traditional optimization models for various tree species. Small seeds of Manchurian walnut in caches were less likely to be recovered than large ones and showed greater cache survival rates, indicating that small seeds would be more advantageous for regeneration than large seeds in small rodent-dominated forests.

4

Lycocerus strictipennis sp. nov. from Yunnan, China, the second species in the Michiakii species-group of Lycocerus Gorham (Coleoptera: Cantharidae)

100%

Yang Y., Yang X.

Annales Zoologici

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2011

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tom 61

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nr 4

A second species of michiakii species-group of Lycocerus Gorham is described, L. strictipennis sp. nov. (CHINA, Yunnan), and provided with illustrations of aedeagus. L. michiakii Okushima et Brancucci, 2008 is recorded from China for the first time. Habitus photos of both species are presented.

5

Life cycle CO2 emission estimation of CCS-EOR system using different CO2 sources

81%

Jiang Y., Lei Y., Yang Y., Wang F.

Polish Journal of Environmental Studies

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2018

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tom 27

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nr 6

Balancing sustained economic growth with energy security and environmental and climate change constraints is a common but difficult challenge. China, as the largest energy consumer in the world – 90% of which is fossil fuel-based – faces the enormous task of transforming its energy mix to low-emissions. CO₂ has been successfully injected for the purposes of both carbon capture and storage (CCS) and enhanced oil recovery (EOR). This study employs life cycle assessment to quantify the CO₂ emissions from the CCS-EOR system to analyze net CO₂ emissions. This system includes carbon capture, transportation, EOR, downstream, and consumption. Our model analyzes life cycle CO₂ emissions from plants of integrated gasification combined cycle (IGCC) with CCS, pulverized coal plants (PC) with CCS, and oxy-fuel plants with CCS while we use technologies of fractionation, refrigeration, Ryan-Holmes, and membrance in the process of EOR. Total CO₂ emissions are 114.69-121.50 Mt CO₂e, 222.95-236.19 Mt CO₂e, and 49.09-51.96 Mt CO₂e from IGCC, PC, and oxy-fuel plants, respectively, based on IGCC with 426 MW, PC with 600 MW, and oxy-fuel with 200 MW in China. Emissions from the combustion of refined petroleum fuel is the most of total emissions – from 66.21% to 71.35%, emissions from EOR are 14.27-19.32%, emissions from downstream are 8.47-9.13%, emissions from capture are 4.12-5.09%, and emissions from transportation are 0.47-1.61%. Based on these results, CCS-EOR (where CO₂ is sourced from IGCC, PC and oxy-fuel plants) provides one potential means for producing electricity and oil to meet growing energy demand and reducing CO₂ emissions to abate global warming.

6

Mutual influence of energy consumption and foreign direct investment on haze pollution in China: a spatial econometric approach

81%

Tang D., Xu H., Yang Y.

Polish Journal of Environmental Studies

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2018

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tom 27

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nr 4

Based on the data of annual average values of PM₁₀ concentrations in China, this study empirically investigates the spatial autocorrelation of haze pollution in China and the mutual influence of energy consumption and foreign direct investment on haze pollution in China from 2004 to 2014 using the spatial econometric method. Moran’s I values are all above 0 during the 10 years, which indicates that haze pollution in China exists with significant spatial autocorrelation. Then the spatial econometric model estimation results show that energy consumption has a significant and positive effect on haze pollution in China while foreign direct investment has a significant and negative effect on haze pollution. Meanwhile, the regression coefficient of mutual variable of energy consumption and foreign direct investment is 0.063 at the 5% level, which suggests that foreign direct investment plays an important role in regulating the relationship between energy consumption and haze pollution, namely that the aggravation effect of energy consumption on haze pollution will increase with the increase of foreign direct investment. Finally, we provide some policy guidance for controlling haze pollution in China.

7

Advanced treatment of coal chemical industry wastewater by electro-catalysis with Gd-doped Ti/SnO2 anode

81%

Hou B., Deng R., Zhuang H., Yang Y.

Polish Journal of Environmental Studies

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2017

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tom 26

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nr 3

The preparation of a Gd-doped Ti/SnO₂ anode using the sol-gel method was employed in electrolysis as an advanced treatment of coal chemical industry wastewater. The optimal Gd-doped content and sintering temperature were 2% and 750ºC. The electro-catalytic performance was enhanced after doping with an adequate amount of Gd. The doped Gd accelerated the generation rate and content of hydroxyl radicals in the electrolysis process. Gd was mixed into the SnO₂ lattice by means of displacement to refine the SnO₂ crystalline grain. The diminution of grain size supplied more active sites on the electrode surface. The reaction of TOC degradation was between pseudo zero-order and first-order kinetics, and was more inclined to pseudo first-order kinetics. The performance and the stability test demonstrated that the prepared Ti/Gd-SnO₂ anode was competent and that electrolysis with the anode could serve as a technically feasible method with potential application for the advanced treatment of coal chemical industry wastewater.

8

Pollution processes in chinese mining area from isotope evidence

81%

Meng Z., Yang Y., Qin Z.

Polish Journal of Environmental Studies

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2018

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tom 27

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nr 6

Hydrological and nitrate pollution processes are important parts of aquatic ecosystems. For this study we collected samples of river water, reservoir water, shallow groundwater, deep groundwater, and precipitation in the Fenhe River Basin. δD and δ¹⁸O were used to identify the hydrological process. δ¹⁵N-NO₃⁻ and δ¹⁸O-NO₃⁻ were used to identify the sources and pollution process of NO₃⁻. The results show that precipitation is the main source of water in the study area, and there is an obvious isotopic fractionation caused by evaporation. The reservoir water, river water, soil water, and shallow groundwater had a mutual recharge and discharge association. Deep groundwater is recharged by archaic groundwater and less affected by evaporation and human activity. NO₃⁻ is the main N species in the study area, nitrification is the main source of NO₃⁻, and denitrification is also found in some river branches. 46.2% of NO₃⁻-N concentrations exceeded the drinking water standard of China. NO₃⁻ Sources are mainly controlled by land use type. Nitrogen in precipitation and soil organic N are the major sources of NO₃⁻ in the upstream. The midstream area is mainly polluted by manure and sewage, while the downstream area is polluted by a mixture of soil organic N and fertilizers.

9

Study on striking ship with loading impact on the performance of the double hull oil tanker collision

81%

Wu W., Yang Y., Zhang J., Lu J.

Polish Maritime Research

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2018

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tom 25

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nr Special Issue S2

Due to the great danger of the collision of oil tankers, lots of research on the collision of oil tankers has been carried out. But, at present, the research on the collision of oil tankers mainly focuses on the loading condition of the struck ship, ignores the impact on the loading condition of the striking ship. However, during the actual oil tanker collision, the striking ship is generally in the state of loading. Therefore, it is necessary to carry out the analysis of the impact of the loading condition of the striking ship on the collision damage of the oil tanker. In this paper, the effect of striking ship with loading on the impact performance of the side structure during the collision of the cargo double hull oil tanker has been investigated. The ship collision model was established by using the finite element software ANSYS/LS-DYNA which is based on 7000 tons of double hull oil tankers. Based on the analysis of the collision force, impact of striking speed changes, impact of striking deep changes and structural energy absorption during the collision process, the influence of the striking ship with loading on the damage mechanism and the impact performance of the double shell oil ship side structure was expounded. The results show that the influence of the striking ship with loading can be great to the damage to side hull during the research of the collision performance of the oil tanker

10

Return period for urban rainwater drainage networks based on the lowest total social investment method: a case study in Tianjin, China

81%

Yang Y., Li M., Xiong M., Cao J.

Polish Journal of Environmental Studies

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2019

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tom 28

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nr 5

Waterlogging is related to rainfall intensity as well as drainage network design. In previous studies, rainfall intensity was dominantly considered, while the design return period with the lowest total social investment of drainage networks was generally neglected. In this study, Guangkai Street in Tianjin in northern China was selected as a case study to determine the optimal design return period of drainage networks. According to the drainage networks for different design return periods, the depth of waterlogging was simulated based on the FloodArea model under the conditions of the rainfall exceeding the design return period. Furthermore, traffic losses due to waterlogging were determined by using the traffic loss model. When the sum of traffic losses and drainage network investment is smallest (i.e., the lowest total social investment), the corresponding return period is considered as the optimal design return period of drainage networks. By comparing the simulated depths of waterlogging and observations of 17 waterlogging monitoring points, we found that the FloodArea model has efficient simulation in most areas. Accordingly, the FloodArea model was used to simulate the depths of waterlogging with different return periods in Guangkai Street. The results show that the total social investment, including traffic losses and initial investment of drainage networks, is the lowest with the return period of the drainage networks in the selected area being designed as 5 years. This suggests that the design return period of the drainage networks in Guangkai Street should be upgraded to 5 years. The approach in this study is based on high-precision simulation (1 m GIS data) and actual waterlogging depth to ensure the accuracy of simulation. The optimal design return period is calculated in combination with traffic losses and initial investment of drainage networks, providing reference for the design of drainage networks in specific areas.

11

Spatial econometric analysis of the effect of government governance on regional emission reduction: evidence from China

81%

Yang Y., Niu G., Tang D., Zhu M.

Polish Journal of Environmental Studies

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2018

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tom 27

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nr 6

This paper analyzes the spatial distribution characteristics of carbon dioxide (CO₂) emissions in 30 Chinese provinces from 2002 to 2013, and systematically examines the relationship between government and CO₂ emissions from the level of regional legal regulation, the level of public expenditure, and corruption. Research results show that the global Moran’s I values of carbon emissions from 2002 to 2013 falls between 0.2 and 0.3, and spatial lag coefficient ρ stands at 0.2340, indicating that CO₂ emissions in the region increase by 0.234% for each additional 1% of CO₂ emissions in the adjacent areas, which means carbon emissions exist in a remarkable spatial autocorrelation and spatial clustering phenomenon. Then the empirical results find that the level of legal regulation and the level of regional corruption are significantly negatively correlated with regional CO₂ emissions, while the level of public expenditure is significantly positively correlated with regional CO₂ emissions. The results also demonstrate the inverted “U”-shaped relationship between economic income and CO₂ emissions. Based on empirical results, this paper provides beneficial policy recommendations for reducing carbon emissions.

12

Identification of microRNAs potentially involved in male sterility of Brassica campestris ssp. chinensis using microRNA array and quantitative RT-PCR assays

81%

Jiang J., Jiang J., Yang Y., Cao J.

Cellular and Molecular Biology Letters

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2013

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tom 18

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nr 3

microRNAs (miRNAs) are a class of newly identified, noncoding, small RNA molecules that negatively regulate gene expression. Many miRNAs are reportedly involved in plant growth, development and stress response processes. However, their roles in the sexual reproduction mechanisms in flowering plants remain unknown. Pollen development is an important process in the life cycle of a flowering plant, and it is closely related to the yield and quality of crop seeds. This study aimed to identify miRNAs involved in pollen development. A microarray assay was conducted using the known complementary sequences of plant miRNAs as probes on inflorescences of a sterile male line (Bcajh97-01A) and a fertile male line (Bcajh97-01B) of the Brassica campestris ssp. chinensis cv. ‘Aijiaohuang’ genic male sterility sister line system (Bcajh97-01A/B). The results showed that 44 miRNAs were differently expressed in the two lines. Of these, 15 had over 1.5-fold changes in their transcript levels, with 9 upregulated and 6 downregulated miRNAs in inflorescences of ‘Bcajh97-01A’ sterile line plants. We then focused on 3 of these 15 miRNAs (miR158, miR168 and miR172). Through computational methods, 13 family members were predicted for these 3 miRNAs and 22 genes were predicted to be their candidate target genes. By using 5’ modified RACE, 2 target genes of miR168 and 5 target genes of miR172 were identified. Then, qRT-PCR was applied to verify the existence and expression patterns of the 3 miRNAs in the flower buds at five developmental stages. The results were generally consistent with those of the microarray. Thus, this study may give a valuable clue for further exploring the miRNA group that may function during pollen development.

13

Multi-AUV distributed task allocation based on the differential evolution quantum bee colony optimization algorithm

81%

Li J., Zhang R. B., Yang Y.

Polish Maritime Research

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2017

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tom 24

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nr Special Issue S3

The multi-autonomous underwater vehicle (AUV) distributed task allocation model of a contract net, which introduces an equilibrium coefficient, has been established to solve the multi-AUV distributed task allocation problem. A differential evolution quantum artificial bee colony (DEQABC) optimization algorithm is proposed to solve the multi-AUV optimal task allocation scheme. The algorithm is based on the quantum artificial bee colony algorithm, and it takes advantage of the characteristics of the differential evolution algorithm. This algorithm can remember the individual optimal solution in the population evolution and internal information sharing in groups and obtain the optimal solution through competition and cooperation among individuals in a population. Finally, a simulation experiment was performed to evaluate the distributed task allocation performance of the differential evolution quantum bee colony optimization algorithm. The simulation results demonstrate that the DEQABC algorithm converges faster than the QABC and ABC algorithms in terms of both iterations and running time. The DEQABC algorithm can effectively improve AUV distributed multi-tasking performance

14

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Changes of surface energy partitioning caused by plastic mulch in a cotton field

81%

Ai Z., Yang Y., Wang Q., Qiu G.

International Agrophysics

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2018

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tom 32

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nr 3

15

Morphological and molecular study of Neorhadinorhynchus nudus (Harada, 1938) (Acanthocephala: Cavisomidae) from Auxis thazard Lacepede (Perciformes: Scombridae) in the South China Sea

81%

Li L., Chen H.-X., Yang Y.

Acta Parasitologica

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2018

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tom 63

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nr 3

16

Transcriptome analysis using RNA-Seq revealed the effects of nitrogen form on major secondary metabolite biosynthesis in tea (Camellia sinensis) plants

81%

Yang Y., Wang F., Wan Q., Ruan J.

Acta Physiologiae Plantarum

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2018

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tom 40

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nr 07

17

Molecular phylogeny of Populus (Salicaceae, Salicales) with focus on inter- and intrasectional relationships

81%

Du S., Hu X., Yang Y., Wang Z.

Dendrobiology

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2022

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tom 88

18

FDI Inflows, market fragmentation and their impact on industrial environmental efficiency: an empirical study in China

81%

Zhou X., Sun X., Yang Y., Chen Y.

Polish Journal of Environmental Studies

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2020

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tom 29

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nr 4

19

Simulated ammonia nitrogen wastewater treated with spent mushroom compost in a laboratory bioreactor

81%

Yang Y., Liang W., Hu K.

Polish Journal of Environmental Studies

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2016

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tom 25

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nr 5

The simulated ammonia nitrogen wastewater was treated with spent mushroom compost (SMC) in a laboratory bioreactor (LBR), and shifts in microbial diversity in LBR were conducted by polymerase chain reaction and denaturing gradient gel electrophoresis (PCR-DGGE). We found that the removal efficiencies of NH4+-N and COD reached 73.4% and 61.7%, respectively, and that simultaneous nitrification and denitrification (SND) was observed during the process of NH4+-N removal. In addition, we observed that there were no obvious changes in microbial diversity shifts, and that the predominant four isolates were identified as Flavobacterium johnsoniae, Sphinbacterium multivorum, Comamonas sp., and Rhizobium sp., which functioned together and played a critical role in treating simulated ammonia nitrogen wastewater in LBR. Overall, SMC could provide both carbon sources and indigenous functional microorganisms for nitrogen removal, indicating that SMC has potential for wastewater treatment.

20

Descriptions of three new cantharid species related to themus (Themus) Senensis (Pic, 1922) (Coleoptera: Cantharidae)

81%

Yang Y., Su J., Kopetz A.

Annales Zoologici

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2014

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tom 64

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nr 4

Themus (T.) senensis (Pic, 1922) is redescribed and three new species related to it are described, T. (T.) senensomimus sp. nov. (China, Thailand), T. (T.) bilobatus sp. nov. (Laos, Vietnam) and T. (T.) dalatensis sp. nov. (Vietnam). Each species is provided with illustrations of aedeagus and abdominal sternite VIII of female. T. (T.) senensis is also presented with female genitalia and the new species with habitus of both sexes. A key and a distribution map of the above four species are presented.

Ograniczanie wyników

Effectiveness of Korean pine (Pinus koraiensis) seed dispersal by small rodents in fragmented and primary forests

Electrochemical properties and pollution remediation mechanism of P-MFC anode under cadmium stress

Scatterhoarding of Manchurian walnut Juglans mandshurica by small mammals: response to seed familiarity and seed size

Lycocerus strictipennis sp. nov. from Yunnan, China, the second species in the Michiakii species-group of Lycocerus Gorham (Coleoptera: Cantharidae)

Life cycle CO2 emission estimation of CCS-EOR system using different CO2 sources

Mutual influence of energy consumption and foreign direct investment on haze pollution in China: a spatial econometric approach

Advanced treatment of coal chemical industry wastewater by electro-catalysis with Gd-doped Ti/SnO2 anode

Pollution processes in chinese mining area from isotope evidence

Study on striking ship with loading impact on the performance of the double hull oil tanker collision

Return period for urban rainwater drainage networks based on the lowest total social investment method: a case study in Tianjin, China