BIOLOGIA
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2023
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IF 1.5
Guo Yu,Guo Xian-Guo,Song Wen-Yu,Lv Yan,Yin Peng-Wu,Jin Dao-Chao
Chiggers are a group of ectoparasites and they are the vector of scrub typhus. Although the Ryukyu mouse ( Mus caroli ) is a common species of rodent in some outdoor habitats, few studies are about the mouse itself and its ectoparasites. To date, there has been no specific report on chiggers of M. caroli . Based on the field investigation in southwest China from 2001 to 2019, this paper reported the infestation and distribution of chiggers on M. caroli for the first time. Among the 91 sites investigated, 263 Ryukyu mice were captured at 18 sites, and 678 chiggers were collected from the mice. The collected chiggers were identified to be one family, two subfamilies, six genera, and 16 species with relatively low species diversity. The overall infestation prevalence ( P M ), mean abundance ( MA ), and mean intensity ( MI ) were P M = 27.38%, MA = 2.58 chiggers/per mouse, and MI = 9.42 chiggers/per mouse respectively. The dominant chigger species are Walchia ewingi and W. micropelta with a total constituent ratio of C r = 94.10% (638/678), and they were of aggregated distribution among different individuals of the host M. caroli . The distribution of two dominant chigger species seemed to be mutually independent with the association coefficient V ≈ 0 ( p < 0.001). The infestation ( P M , MA , and MI ) of M. caroli with chiggers greatly fluctuated in different geographical landscapes, altitudes, and latitudes with an obvious environmental heterogeneity. The male and adult M. caroli harbored much more chigger mites with significantly higher infestations ( P M , MA and MI ) than the female and juvenile mice. The theoretical curve of species abundance distribution of the chigger mite community on M. caroli was fitted by Preston lognormal distribution model with fitting goodness R 2 = 0.77. Based on the iChao 1 formula, the expected total number of chigger species on the mice was estimated to be 24 species.
研究领域:
医学昆虫学
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寄生虫学
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生态学
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DOI
高影响因子
JOURNAL OF ECONOMIC ENTOMOLOGY
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2014
·Vol. 107
·期 3
·1233-1238
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IF 1.605
Zhang Ruimin,He Shiyu,Chen Jiahua
The oriental fruit fly, Bactrocera dorsalis (Hendel), is a globally important economic insect pest that has evolved resistance to various types of insecticides. Cyantraniliprole (DuPont Cyazypyr) is a new anthranilic diamide insecticide registered to control lepidopteran and sucking insects. The susceptibility of field-collected populations of B. dorsalis to cyantraniliprole was assessed via a diet incorporation bioassay in adults. Based on the obtained LC50 values (ranging from 3.29 to 15.83 μg/g), all the testing populations, including ZZ (Fujian province), HH (Yunnan province), JM (Guangdong province), SY (Hainan province), HZ (Zhejiang province), YL (Guangxi province), SH (Shanghai), WH (Hubei province), and CS (Hunan province), were susceptible to cyantraniliprole, with the samples of WH (Hubei province) being the most tolerant (by 4.80-fold). Two (SY, Hainan province; CS, Hunan province) of the nine field-collected populations of B. dorsalis showed a similar susceptibility to cyantraniliprole, while the remaining populations displayed narrow variations in tolerance compared with the laboratory strain. Synergist assays were performed to determine the potential detoxification mechanisms. Piperonyl butoxide showed significant synergism effects in lab, CS, and resistant strain. S,S,S-tributylphorotrithioate and diethyl maleate also showed obvious synergism effects in resistant strain. A 19.44-fold increase in resistance to cyantraniliprole was observed after 14 generations of selection in the laboratory. The present work clarifies the baseline susceptibility and primary mechanisms of B. dorsalis to cyantraniliprole in the south China and established a cyantraniliprole-resistant strain as well. A sound resistance management strategy is also discussed in relation to the risk of susceptibility.
研究领域:
昆虫学
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害虫管理
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农业科学
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Rui Hou,Qianyi Huang,Yunfeng Pan,Lang Lin,Shan Liu,Hengxiang Li,Xiangrong Xu
The increasing discharge and ubiquitous occurrence of novel brominated flame retardants (NBFRs) in aquatic environments have initiated intense global concerns; however, little information is available regarding their structure-related trophodynamics in marine food webs. In this study, a tropical marine food web including 29 species (18 fish and 11 invertebrate species) was collected from coral reef waters of the Xisha Islands, the South China Sea, for an analysis of 11 representative NBFRs. The mean ∑NBFR concentrations generally increased in the following sequence: sea cucumbers (0.330 ng/g lw) < crabs (0.380 ng/g lw) < shells (2.10 ng/g lw) < herbivorous fishes (2.30 ng/g lw) < carnivorous fishes (4.13 ng/g lw), with decabromodiphenyl ethane (DBDPE) and hexabromobenzene (HBB) as the predominant components. Trophic magnification was observed for all of the investigated NBFRs, with trophic magnification factors (TMFs) ranging from 1.53 (tetrabromobisphenol A bis(dibromopropyl ether)) to 5.32 (HBB). Significant negative correlations were also found between the TMFs and the tested in vitro transformation clearance rates (CLin vitro) for the target NBFRs except for bis(2-ethylhexyl)-3,4,5,6-tetrabromo-phthalate (TBPH) (p < 0.05). Multiple linear regression analysis confirmed that the transformation rate is a more powerful predictor for TMFs than the hydrophobicity of NBFRs in this marine food web.
研究领域:
生态学
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环境科学
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DOI
PubMed
高影响因子
COLLOID AND POLYMER SCIENCE
·
2025
·
IF 2.3
Zhang Wenlong,Zhang Qi,Xia Tianbao,Ji Qiuhan,Liu Jiefan,Liu Xingwen,Wang Lan,Wang Longyao
A viscoelastic surfactant ( VES ) clean fracturing fluid is an excellent alternative to polymer-based fracturing fluids for fracturing low-permeability reservoirs. However, the existing VES either has poor salt resistance or involve complicated preparation steps. Herein, a cationic Gemini VES with high salt tolerance, named neopentanediol di-(erucamide propyl ammonium bromide) ( NEPB ), was synthesized through a one-step reaction to simplify the process, using erucamide propyl dimethylamine and pentaerythritol dibromide dissolved in DMF . The double hydroxyl groups on the spacer imparts NEPB superior salt tolerance to the Gemini VES with a single hydroxyl ( JS-(OH)-JS ). Salinity-sensitive evaluation experiments consisting of salinity cloud point, DLS , and fluorescent probe tests; rheological experiments including apparent viscosity, viscoelasticity, and heat and shear resistance measurement; and comprehensive tests of fracturing fluids such as proppant suspending, gel-breaking, and core damage rate were carried out to study the performance of NEPB used in a fracturing fluid. The apparent viscosity of 3 wt% NEPB solution rises to the peak value at the NaCl concentration of 5 wt%, much higher than that of the JS-(OH)-JS solution. Oscillatory measurements exhibit that the NEPB solution with the peak apparent viscosity exhibits superior viscoelasticity to the JS-(OH)-JS solution, and the relaxation time and the plateau of the storage moduli are 17.69 s and 53.71 Pa. And the NEPB VES fracturing fluids prepared by the simulated seawater of the South China Sea, with NaSal added, exhibits best heat and shear resistance, and the remain viscosity is above 40 mPa·s. Settling velocity proppant in the NEPB VES fracturing fluid with NaSal added is 1.22 mm/s. Ethylene glycol butyl ether exhibits a superior gel-breaking performance to crude oil, and the insoluble residues of the ethylene glycol butyl ether gel-breaking fluids are all below 3 mg/L. The development of NEPB not only simplifies the preparation course of VES but also improve the salt tolerance of cationic Gemini VES , which is meaningful to the development of low-permeability oil and gas reservoirs offshore. Graphical
研究领域:
石油工程
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化学工程
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2014
·
IF 2.045
Shurui Xu,Shuanshi Fan,Yanhong Wang,Xuemei Lang
We first measured the hydrate equilibrium of two real gases from the South China Sea in the pressure range of 1.85 MPa to 9.32 MPa. Then, three kinetic hydrate inhibitors (poly(N-vinyl) pyrrolidone, Inhibex501, and synthesized KHI-HY4) were tested from 275.15 K to 283.15 K and the pressure range from 2 MPa to10 MPa in the case of two real gases under 11.6 K to 14.0 K subcooling. The results show that the maximum subcooling temperature of three hydrate inhibitors increased with the increase of the pressure for the real gases, and hydrate formation induction time increased more than 1.5 times with the inhibitor concentration decreasing for HY4 or Inhibex501 for the real gases at a certain subcooling range. It was believed that each inhibitor has its optimal subcooling for usage in real gas. When the subcooling reached the optimal value, remarkable inhibitory performance could be displayed.
研究领域:
化学工程
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能源科学
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产品关联
DOI
高影响因子
Exposure and Health
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2025
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IF 4.6
Guo Jiaqi,Hu Zifan,Sun Weiyang,Li Jia,Huang Xinyi,Zhou Xianghong,Zhang Zilong,Jin Yuming,Huang Weichao,Luo Chunying,Harada Koji,Qiu Shi,Zou Xiaoli
Per- and polyfluoroalkyl substances (PFAS), as endocrine disruptors, may increase the risk of prostate cancer by interfering with the endocrine system, however, current population-based evidence is still limited, and there are relative few types of PFAS involved. This study aims to investigate the association between exposure to 18 kinds of PFAS and the incidence of prostate cancer in southwest China. In the case–control study, plasma samples from 97 PCa patients and 111 controls without a family history were analyzed using UPLC-MS/MS. The association between PFAS concentrations and prostate cancer was analyzed using Mann–Whitney U tests and Bayesian logistic regression. The detection limits of the proposed UPLC-MS/MS method ranged from 0.00070 to 0.30 ng/mL. The detection rate of most PFAS is greater than 75%, except for Perfluorodecanesulfonic acid (PFDS), Perfluorohexanoic acid (PFHxA), Perfluorohexadecanoic acid (PFHxDA), Perfluorooctadecanoic acid (PFODA), Perfluoropentanoic acid (PFPeA), Perfluorotetradecanoic acid (PFTeDA). Mann–Whitney U test results showed that differences in Perfluorobutanoic acid (PFBA), Perfluorohexanesulfonic acid (PFHxS), Perfluoroheptanesulfonic acid (PFHpS), Perfluorooctanesulfonic acid (PFOS), and Perfluoroundecanoic acid (PFUnDA) between the two groups were statistically significant, suggesting that exposure to these compounds may be associated with prostate cancer occurrence. Bayesian analysis showed no significant correlation for several PFAS, but Perfluorooctanoic acid (PFOA) [OR 2 ≥4.02 = 2.86, 95% CI 2 (1.64, 6.28)], Perfluorononanoic acid (PFNA) [OR 2 ≥1.61 = 3.82, 95% CI 2 (1.22, 16.08)], and PFUnDA [OR 2 ≥0.462 = 7.14, 95% CI 2 (1.12, 68.7)] demonstrated a positive correlation in high-concentration groups. Conversely, PFOS showed a negative correlation after adjustment [OR 2 ≥3.71 = 0.97, 95% CI 2 (0.87, 0.99)]. These results suggest a potential link between PFAS exposure and prostate cancer in the Chinese population, warranting further research.
研究领域:
环境科学
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医学
·
流行病学
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产品关联
DOI
高影响因子
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