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A Secured Iran? Iran' s Independent Active Deterrence Strategy
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作者 He Jingjie 《Contemporary International Relations》 2017年第5期131-149,共19页
Until now the Islamic Republic of Iran's adoption of an independent active deterrence strategy,a strategy based on threat assessment and self-assessment,has overall been a success.The sole exception involved Iraq ... Until now the Islamic Republic of Iran's adoption of an independent active deterrence strategy,a strategy based on threat assessment and self-assessment,has overall been a success.The sole exception involved Iraq in 1980 and was due to Iran's initial vulnerability following the revolution.As Saudi Arabia maneuvers with influence from US President Donald Trump,and given that Iran is unlikely to withdraw its military nuclear program under the existing security environment,the US and Israel ought to strengthen their nuclear deterrence capabilities against Iran.They need to issue clear,open,official retaliation commitments under a hypothetical nuclear scenario and bolster them with corresponding military and diplomatic capability. 展开更多
关键词 Iran security concept deterrence nuclear program
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Wildlife Deterrence from Hazards Using High Brightness Ultraviolet Light
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作者 Donald J. Ronning 《Journal of Chemistry and Chemical Engineering》 2016年第3期109-119,共11页
The purpose of this study was to examine the behavioral impact of varying LED (light emitting diode) spectral emissions on avian species. A novel oculo-neuro-motor response to monochromatic LEDs has been identified.... The purpose of this study was to examine the behavioral impact of varying LED (light emitting diode) spectral emissions on avian species. A novel oculo-neuro-motor response to monochromatic LEDs has been identified. LED colored light of sufficient intensity matched to the short-wavelength cones of avian species can efficiently diminish overall visual perception leading to an augmented behavioral response. The study method involved monitoring the change in behavioral response after exposure to high brightness monochromatic LED light to wild Osprey (Pandion haliaetus) foraging and nesting in their natural environment. Our results demonstrated a statistically significant change in foraging behaviors with wild Osprey (p = 0.005) and in nesting behavior as a result of exposure to high brightness monochromatic LED light. An augmented behavioral responses was observed which is believed to be analogous to human reaction to solar glare and glint. The neuroimaging mechanism of avian species is discussed. This novel augmented behavioral response provides a new technique of studying the neuroscience of temporal and spatial light stimulus. A non-lethal deterrence technique involving the augmented behavioral response could mitigate mortality and morbidity of avian-human conflict in areas such as airports, airplane bird strikes, and wind turbines. 展开更多
关键词 Avian vision ultraviolet LED non-lethal deterrence solar glare solar glint.
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U.S.Deterrence and Coercive Diplomacy and China's Coping Strategy
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作者 Zhang Wenzong 《Contemporary International Relations》 2017年第1期29-49,共21页
Deterrence and coercion are two kinds of strategies,the latter being more aggressive than the former.The U.S.Asia-Pacific Rebalancing strategy is an important diplomatic legacy of Obama's administration.For the is... Deterrence and coercion are two kinds of strategies,the latter being more aggressive than the former.The U.S.Asia-Pacific Rebalancing strategy is an important diplomatic legacy of Obama's administration.For the issues involving the Diaoyu Islands,the South China Sea,cyber security,DPRK's nuclear program,and Iran's nuclear program,the U.S.has carried out military deterrence and non-force coercion against China.But generally,these are low-level coercive measures and distinct from the severe economic sanction and diplomatic isolation imposed by the U.S.on Russia,Syria,DPRK and Iran in recent years.Concerning issues where the U.S.and China hold distinct views,there would be less strategic leeway for the two countries.If the U.S.is to strengthen deterrence and coercion towards China,China can respond more actively and effectively,but it will be more difficult to build a new model of China-U.S.major-country relationship. 展开更多
关键词 U.S Asia-Pacific Rebalancing Strategy deterrence coercion
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Is It About Time to Rethink American Extended Deterrence?
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作者 Nursin Atesoglu GUNEY 《International Relations and Diplomacy》 2014年第1期55-65,共11页
In today's complex web of relations due to the end of the confrontation between the East and West, nuclear materials, technologies, know-how, and scientists have been diffused to states and non-state actors that act ... In today's complex web of relations due to the end of the confrontation between the East and West, nuclear materials, technologies, know-how, and scientists have been diffused to states and non-state actors that act irrationally most of the time. The precedent example of nuclear North Korea has given rise to new concerns like whether the low levels of military casualties stemming from nuclear or near-nuclear capable countries will damage the credibility of US/North Atlantic Treaty Organization (NATO) extended deterrence. The ambiguity about how the future of the Iranian Geneva interim agreement will be finalized certainly feeds such kinds of concerns among Tehran's neighbors. Till now, both Turkey and South Korea have directly felt and lived through similar kinds of threats. It is true that, during the Cold War years, these two countries have enjoyed the benefit of American assured nuclear security guarantee. However, the current US/NATO extended deterrence due to the mentioned newly arising threats of our times has fallen short of stopping the skirmishes that are occurring at low levels of confrontation. That is why this paper will try to analyze and compare South Korean and Turkish cases so as to comprehend whether there is a necessity to re-think extended deterrence mechanisms that are differently dispatched to meet Ankara's and Seoul's peculiar security needs. 展开更多
关键词 extended deterrence Weapon of mass destruction ANKARA SEOUL Iran South Korea low levels of skirmishes
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Feeding Deterrence of Common Spices against <i>Helicoverpa armigera</i>Larvae 被引量:1
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作者 Weizheng Li Jingjing Hu +3 位作者 Jing Yang Guohui Yuan Xianru Guo Meihao Luo 《Advances in Bioscience and Biotechnology》 2014年第13期1025-1031,共7页
Edible spices with strong smells or heavy tastes may be a promising resource of feeding deterrents. We compared the feeding deterrence of the ethanol extracts of 21 common spices against the larvae of a generalist pes... Edible spices with strong smells or heavy tastes may be a promising resource of feeding deterrents. We compared the feeding deterrence of the ethanol extracts of 21 common spices against the larvae of a generalist pest species, Helicoverpa armigera, using a multiple-choice leaf disc bioassay. The results show that Zanthoxylum bungeanum extract (as a reference) always evoked significant feeding deterrence, while Piper nigrum (both black pepper and white pepper), Piper longum, and Angelica dahurica evoked the strongest and equivalent feeding deterrence. The potent feeding deterrent activity of Piper species may be a common characteristic at genus level. 展开更多
关键词 HELICOVERPA ARMIGERA Spice Feeding DETERRENT PIPER
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Understanding the deterrence effect of punishment for marine information security policies non-compliance
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作者 Xiaolong Wang Changlin Wang +1 位作者 Tianyu Yi Wenli Li 《Journal of Ocean Engineering and Science》 SCIE 2024年第1期9-12,共4页
In the organizational setting of marine engineering,a significant number of information security incidents have been arised from the employees’failure to comply with the information security policies(ISPs).This may b... In the organizational setting of marine engineering,a significant number of information security incidents have been arised from the employees’failure to comply with the information security policies(ISPs).This may be treated as a principal-agent problem with moral hazard between the employer and the employee for the practical compliance effort of an employee is not observable without high cost-.On the other hand,according to the deterrence theory,the employer and the employee are inherently self-interested beings.It is worth examining to what extent the employee is self-interested in the marine ISPs compliance context.Moreover,it is important to clarify the proper degree of severity of punishment in terms of the deterrent effect.In this study,a marine ISPs compliance game model has been proposed to evaluate the deterrence effect of punishment on the non-compliance behavior of employee individuals.It is found that in a non-punishment contract,the employee will decline to comply with the marine ISPs;but in a punishment contract,appropriate punishment will lead her to select the marine ISPs compliance effort level expected by the employer,and cause no potential backfire effect. 展开更多
关键词 deterrence mechanism Marine engineering Information security policies Non-compliance behavior Principal-agent model with moral hazard Punishment
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Supplementary Deterrence and "Commutation upon Compensation"
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《Social Sciences in China》 2010年第4期5-19,共15页
Utilizing the analytical framework of law and economics on deterrence and taking into account the two basic justifications for criminal penalties based on the arguments of "insolvency" and "insufficient deterrence,... Utilizing the analytical framework of law and economics on deterrence and taking into account the two basic justifications for criminal penalties based on the arguments of "insolvency" and "insufficient deterrence," this article discusses, in light of institutional efficiency, the feasibility, advantages and potential problems of "commutation upon compensation." The article also discusses some traditional jurisprudential issues including remedial justice, retribution and equity. 展开更多
关键词 efficiency of deterrence INSOLVENCY insufficient deterrence supplementary deterrence
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Price-Matching Guarantees and Entry Deterrence under Incomplete Information 被引量:1
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作者 Liping Zhang 《Frontiers of Economics in China-Selected Publications from Chinese Universities》 2012年第2期246-262,共17页
Abstract This paper studies price-matching guarantees in a market where entrant does not have perfect information about incumbent's cost. The low-cost incumbent can adopt price-matching guarantees as a signal to dist... Abstract This paper studies price-matching guarantees in a market where entrant does not have perfect information about incumbent's cost. The low-cost incumbent can adopt price-matching guarantees as a signal to distinguish itself from the high-cost type and thus effectively deter entry. On the other hand, the high-cost incumbent can successfully fool the potential entrant under certain conditions. Compared with the equilibriums in situations where the option of offering a price guarantee is not available, the use of this instrument either makes it easier for the low-cost incumbent to signal its cost, or expands the range of parameters over which the high-cost incumbent is able to deter entry successfully. 展开更多
关键词 matching price guarantee entry deterrence
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Toxic and Antifeedant Effects of Different Pesticidal Plant Extracts against Beet Armyworm (Spodoptera exigua)
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作者 Muhammad Asad Rashad Rasool Khan +6 位作者 Ahmed B.Aljuboory Muhammad Haroon URashid Uttam Kumar Inzamam Ul Haq Aqsa Hafeez Ahmed Noureldeen Khadiga Alharbi 《Phyton-International Journal of Experimental Botany》 SCIE 2023年第4期1161-1172,共12页
The beet armyworm(BAW),Spodoptera exigua(Lepidoptera:Noctuidae)is a highly destructive pest of vegetables and field crops.Management of beet armyworm primarily relies on synthetic pesticides,which is threatening the b... The beet armyworm(BAW),Spodoptera exigua(Lepidoptera:Noctuidae)is a highly destructive pest of vegetables and field crops.Management of beet armyworm primarily relies on synthetic pesticides,which is threatening the beneficial community and environment.Most importantly,the BAW developed resistance to synthetic pesticides with making it difficult to manage.Therefore,alternative and environment-friendly pest management tactics are urgently required.The use of pesticidal plant extracts provides an effective way for a sustainable pest management program.To evaluate the use of pesticidal plant extracts against BAW,we selected six plant species(Lantana camara,Aloe vera,Azadirachta indica,Cymbopogon citratus,Nicotiana tabacum,and Ocimum basilicum)for initial screening experiment.Four out of six plant species such as A.indica,N.tabacum,C.citratus and O.basilicum showed promising mortality of more than 50%.Therefore,we selected these four plant extracts for the subsequent experiments.Through contact bioassay,A.indica showed high mortality 66.63%,followed by the N.tabacum 53.33%,at 10%w/v concentration.Similarly,N.tabacum showed the highest mortality rate,66%at 10%w/v concentration,followed by the A.indica 46%through feeding bioassay.Furthermore,the feeding deterrence assay showed that C.citratus had a high antifeedant index(−50)followed by A.indica(−39),and N.tabacum(−28).In living plant assay,the N.tabacum extract showed a low mean damage score 3.6 on living cotton plant followed by C.citratus 4.5 and A.indica 5.5.Hence,extracts of three plant species provided promising results against the BAW,which can minimize the use of synthetic chemicals,particularly for small landholding farmers.Further studies are also required to evaluate the effects of these plant extract against BAW on cotton plants under field conditions to optimize the further use. 展开更多
关键词 Bioassay methods feeding deterrence botanical pesticide pest management sustainable agriculture
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Multi-scale simulation of diffusion behavior of deterrent in propellant 被引量:1
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作者 Pan Huang Zekai Zhang +5 位作者 Yuxin Chen Changwei Liu Yong Zhang Cheng Lian Yajun Ding Honglai Liu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第2期29-35,共7页
Concentration distribution of the deterrent in single-base propellant during the process of firing plays an important role in the ballistic properties of gun propellant in weapons. However, the diffusion coefficient c... Concentration distribution of the deterrent in single-base propellant during the process of firing plays an important role in the ballistic properties of gun propellant in weapons. However, the diffusion coefficient calculated by molecular dynamics(MD) simulation is 6 orders of magnitude larger than the experimental values. Meanwhile, few simple and comprehensive theoretical models can explain the phenomenon and accurately predict the concentration distribution of the propellant. Herein, an onion model combining with MD simulation and finite element method of diffusion in propellants is introduced to bridge the gap between the experiments and simulations, and correctly predict the concentration distribution of deterrent. Furthermore, a new time scale is found to characterize the diffusion process. Finally, the time-and position-depended concentration distributions of dibutyl phthalate in nitrocellulose are measured by Raman spectroscopy to verify the correctness of the onion model. This work not only provides guidance for the design of the deterrent, but could be also extended to the diffusion of small molecules in polymer with different crystallinity. 展开更多
关键词 Multi-scale simulation DIFFUSION DETERRENT PROPELLANT Onion model Molecular dynamics simulation
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Effect of Ficus benghalensis Latex Based Combinatorial Formulations on Various Bio-Molecules in Indian White Termite Odontotermes obesus
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作者 Abhishek Kumar Tripathi Ravi Kant Upadhyay 《Journal of Biosciences and Medicines》 2023年第4期82-102,共21页
In present investigation, various bioassays were conducted to evaluate the alteration in levels of certain biomolecules, such as glycogen, protein, amino acid, DNA, RNA and lipids. For this purpose, worker termites we... In present investigation, various bioassays were conducted to evaluate the alteration in levels of certain biomolecules, such as glycogen, protein, amino acid, DNA, RNA and lipids. For this purpose, worker termites were treated with sub-lethal dose 40% and 80% of 24 hrs LD<sub>50</sub> values and observations were taken at 4 hrs interval up to 24 hrs. Crude latex and its combinatorial mixtures, like S-MLT-A, B-MLT-A, C-MLT-A, CU-MLT-A, AQ-MLT significantly altered level of bio-molecules in Odontotermes obesus. This effect was found time and dose dependent. Reduction or increase in biomolecules was calculated by using corresponding control. Maximum decrease in glycogen level was observed at 16 h when termites were treated with 80% of LD<sub>50</sub> of Ficus benghalensis aqueous extract i.e. 56.88% at 16 h of treatment. A similar dose caused very slight decrease in lipid contents at 4 h of treatment but it was found further significantly (p > 0.05) decreased in other successive treatments. 40% and 80% of LD<sub>50</sub> of C-MLT-B mixture caused significant (p > 0.05) decrease in DNA and RNA level at 16 h treatment. The level of DNA and RNA level was recorded 83.90%, 90.18% and 85.42% and 74.05% respectively. Similarly, total proteins were also found to be decreased with 40% and 80% of LD<sub>50</sub> of C-MLT-B mixture i.e. 71.47% and 66.45% respectively. All these alterations found in levels of various bio-molecules confirm the action of latex ingredients on worker termites that was antifeedant or deterrent types. These ingredients can be used to control not only termites but also other phytophagous insects in a sustainable and eco-friendly way. 展开更多
关键词 Ficus benghalensis Odontotermes obesus LATEXES Antifeedant or Deterrent Termiticides
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Chinese Customers' WTP for Legal Digital Music Downloading
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作者 Tingting XIANG Jun KE Xinyu CHEN 《Asian Agricultural Research》 2016年第5期33-39,45,共8页
This study is to examine the effects of some significant factors on consumers' willingness to pay( WTP) for digital music via the moderating variables of music affinity and the deterrence effect of the legislation... This study is to examine the effects of some significant factors on consumers' willingness to pay( WTP) for digital music via the moderating variables of music affinity and the deterrence effect of the legislation. Based on 517 Chinese respondents with access to digital music,using the multiple liner regression model,this study indicates that free ideology,perceived benefits of free downloading,perceived benefits of paid downloading,subjective norm,habit strength have direct influence on WTP,and music affinity and the deterrence effect of the legislation have moderating effects. This study contributes theoretically to research on Chinese consumers' WTP for digital music and offers practical recommendations for the digital music charging system setup. 展开更多
关键词 WTP Free IDEOLOGY deterrence effect of legislation Perceived benefits of free or PAID downloading HABIT strength Subjective norm
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The Complicated Security Dilemma and Armament Trends in the Middle East: The Order and Change Predicaments
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作者 Davoud Gharayagh-Zandi 《International Relations and Diplomacy》 2021年第11期490-499,共10页
The security dilemma is a common problem faced with the states in the ongoing anarchic international system.It does matter in the Middle East like the other ones and also has its impact on the arms races in the region... The security dilemma is a common problem faced with the states in the ongoing anarchic international system.It does matter in the Middle East like the other ones and also has its impact on the arms races in the region too.Meanwhile there are some characters named as the order and change predicaments such as the colonial background,weak infrastructure of state construction,and the identity politics embedded in the region that do convert the current complex security dilemma into a complicated one.Not only does it have effect on the regional order,the arm race and disarmament,and also offense/defense paradox,but also does it get on the violent bandwagon in the region.Synergies of the both dilemmas did lead the region into the domestic environment change alongside of regional disorder too.Non-neutral involving the trans-regional powers into the(in)security situation in the region not only did not mitigate the situation but also volatile it too.In conclusion the paper does strive to introduce three phrased manners for transition of the complicated security dilemma. 展开更多
关键词 complicated security dilemma Middle East ARMAMENT order and change predicament balance of power deterrence.
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Study on the analysis method on ballistic performance of deterred propellant with large web size in large caliber artillery 被引量:3
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作者 Yu-wei Wang Wen-fang Zhu +1 位作者 Jia-wei Di Xiao-hong Hu 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2018年第5期522-526,共5页
As for the characteristics of combustibility of deterrent propellant with large web size which is used in large-caliber gun and interior ballistic performance, the combustion characteristics of deterrent propellant ar... As for the characteristics of combustibility of deterrent propellant with large web size which is used in large-caliber gun and interior ballistic performance, the combustion characteristics of deterrent propellant are obtained by using closed-bomb experiments. The combustion law of deterrent propellant and the classic interior ballistic model of composite charge are given. By simulation and analysis the results of the artillery firing test, the burning rate variation law and the interior ballistics simulation parameters of propellant A are determined, and the burning rate relationship between propellant A and propellant B obtained from closed-bomb, then the ballistic performance of propellant B is predicted. The results show that the predicted results are in good agreement with the experimental results. The study shows that the burning rate law of deterrent propellant with large web size can be obtained by closed-bomb experiment. Using the method provided in this paper can accurately predict the interior ballistic performance and provide an important basis for improving the accuracy of interior ballistic calculation. 展开更多
关键词 DETERRENT PROPELLANT Interior BALLISTIC CLOSED-BOMB BURNING rate law
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Toxicity of several botanical essential oils and their combinations against females of Aedes albopictus(Skuse) and Anopheles minimus(Theobald): Oviposition deterrent, ovicidal and adulticidal efficacies 被引量:3
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作者 Nuttavich Cotchakaew Mayura Soonwera 《Asian Pacific Journal of Tropical Biomedicine》 SCIE CAS 2019年第1期29-39,共11页
Objective: To investigate the efficacies of 12 essential oil(EO) formulations from three Zingiberaceae plants(Alpinia galanga, Curcuma zedoaria, and Zingiber cassumunar) individually and in combination with an augment... Objective: To investigate the efficacies of 12 essential oil(EO) formulations from three Zingiberaceae plants(Alpinia galanga, Curcuma zedoaria, and Zingiber cassumunar) individually and in combination with an augmenting Eucalyptus globulus(E. globulus) EO against females of Aedes albopictus(Ae. albopictus) and Anopheles minimus(An. minimus). Methods: These formulations were evaluated for their ovicidal, oviposition deterrent and adulticidal activities against Ae. albopictus and An. minimus by a topical method, a double-choice method and a WHO susceptibility test, respectively. Results: It was found that all formulations of Zingiberaceae plants EOs augmented with E. globulus EO were more effective in oviposition deterrent, ovicidal, and adulticidal activities against the two mosquito species than all of the formulations used without E. globulus EO. Their oviposition deterrent, ovicidal and adulticidal activities were equivalent to those of 10% w/v cypermethrin. In contrast, 70% v/v ethyl alcohol as a control alone was not effective at all. The highest synergistic effect in effective repellency against Ae. albopictus was achieved by 5% Alpinia galanga EO + 5% E. globulus EO and against An. minimus was 5% Zingiber cassumunar EO + 5% E. globulus EO. Moreover, the highest synergistic effects in ovicidal activities against Ae. albopictus and An. minimus were achieved by 10% Zingiber cassumunar EO + 10% E. globulus EO and 5% Curcuma zedoaria EO + 5% E. globulus EO, respectively. For the adulticidal activities, the highest synergistic effect against two mosquitoes was achieved by 5% Curcuma zedoaria EO + 5% E. globulus EO. Conclusions: These results suggest that Zingiberaceae plant EOs augmented with E. globulus EO have a high potential to be developed into oviposition deterrent, ovicidal, and adulticidal agents for controlling populations of Ae. albopictus and An. minimus. 展开更多
关键词 AEDES ALBOPICTUS Anopheles minimus Plant essential oil OVICIDE OVIPOSITION DETERRENT Adulticide
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The Control Efficiency of Plant Alcohol Extracts on the Laboratory Populations of Myzus persicae(Sulzer)and Lipaphis erysimi (Kaltenbach) 被引量:8
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作者 ZHOU Qiong, LIANG Guang-wen ,ZENG Ling and SHEN Shu-ping(Department of Biology, Xiangtan Normal University, Xiangtan 411201 , P. R. China Laboratory of Insect Ecology , South China Arigcultural University ,Guangzhou 510642 , P. R. China) 《Agricultural Sciences in China》 CAS CSCD 2002年第11期1199-1203,共5页
The effects of semiochemicals extracted from 63 species of plants, on peach aphid (Myzus per-sicae) and mustard aphid (Lipaphis erysimi), were studied in laboratory. The deterrent rate, reproduction deterrent index an... The effects of semiochemicals extracted from 63 species of plants, on peach aphid (Myzus per-sicae) and mustard aphid (Lipaphis erysimi), were studied in laboratory. The deterrent rate, reproduction deterrent index and the interferential index of population control (IIPC) was used to evaluate the efficiency of semiochemicals on population control of the two target aphids. The results showed that the extracts of 34 species of common plants have noticeable effect on both aphid populations, especially, Xanthium sibiricum Petr. Et Widd. and Syngonium podophyllum Schott. These plant extracts could be used to construct the plant pro-tectant to protect crops. 展开更多
关键词 Plant alcohol extracts Peach aphid [Myzus persicae(Sulzer)] Mustard aphid [Lipaphis erysimi (Kaltenbach)] Deterrent rate Interferential index of population control (IIPC)
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Adulticidal, larvicidal, pupicidal and oviposition deterrent activities of essential oil from Zanthoxylum limonella Alston(Rutaceae) against Aedes aegypti(L.) and Culex quinquefasciatus(Say) 被引量:2
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作者 Mayura Soonwera Siriporn Phasomkusolsil 《Asian Pacific Journal of Tropical Biomedicine》 SCIE CAS 2017年第11期967-978,共12页
Objective: To evaluate adulticidal, larvicidal and oviposition deterrent response of the essential oil from dried Zanthoxylum limonella(Z. limonella) fruit against Aedes aegypti(Ae. aegypti) and Culex quinquefasciatus... Objective: To evaluate adulticidal, larvicidal and oviposition deterrent response of the essential oil from dried Zanthoxylum limonella(Z. limonella) fruit against Aedes aegypti(Ae. aegypti) and Culex quinquefasciatus(Cx. quinquefasciatus).Methods: Z. limonella oil was tested by biological assays at 1%, 5% and 10% concentrations in ethanol. Adulticidal efficacy was tested against the 2–3 day old adult females. Larvicidal activity was tested against immature stage of mosquitoes. Oviposition deterrence of the oil was evaluated on gravid females.Results: The adult mortality was observed after 24 h with the LC50 of 6.0% for Ae.aegypti, and 5.7% for Cx. quinquefasciatus. Larvicidal bioassay was carried out with the 10% Z. limonella oil against immature stages of Ae. aegypti and Cx. quinquefasciatus,which caused 100% mortality after 12 h and 24 h. In the larvicidal experiment,Z. limonella showed effective result at 1%, 5% and 10% concentrations with the values of LT50 Ae. aegypti = 9.78, 5.61, 0.24 h for larvae and LT50= 64.08, 21.23 h for pupae;Cx. quinquefasciatus had LT50= 28.46, 20.25, 1.01 h for larvae and LT50= 67.52, 27.96,4.11 h for pupae, respectively. Oviposition deterrence of the oil was evaluated on gravid females. In the study, 10% Z. limonella showed 100% repellency for Ae. aegypti and99.53% for Cx. quinquefasciatus. Likewise, oviposition activity indexes of these oil concentrations were all negative values ranging from–0.89 to-1.00 for Ae. aegypti and–0.64 to–0.99 for Cx. quinquefasciatus. The oviposition activity indexes values revealed that Z. limonella oil has deterrent effect, and it caused a remarkable negative response resulting in very few eggs.Conclusions: This result indicates that Z. limonella oil can be used as an effective adulticide, larvicide and oviposition deterrent against Ae. aegypti and Cx. quinquefasciatus. 展开更多
关键词 Zanthoxylum limonella Aedes aepypti Culex quinquefasciatus Adulticide LARVICIDE Oviposition deterrent
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Protection effect of the anthraquinones, cassiatorin and aurantio-obtusin from seeds of Senna tora against cowpea weevil attack 被引量:1
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作者 Valentine Chi Mbatchou Rita Akosua Dickson +2 位作者 Isaac Kingsley Amponsah Abraham Yeboah Mensah Solomon Habtemariam 《Asian Pacific Journal of Tropical Biomedicine》 SCIE CAS 2018年第2期98-105,共8页
Objetive: To explore the potential insecticidal, ovipositor deterrent and antifeedant effects of ethyl acetate extract of the seeds of Senna tora(Syn. Cassia tora) against cowpea weevil(Callosobruchus maculatus).Metho... Objetive: To explore the potential insecticidal, ovipositor deterrent and antifeedant effects of ethyl acetate extract of the seeds of Senna tora(Syn. Cassia tora) against cowpea weevil(Callosobruchus maculatus).Method: The activities were evaluated using standard protocols.In these bioassays, the cowpea seeds were used directly as an insect feed. The activity of the extract and isolated compounds were tested at concentrations of 100, 200 and 300 μg/mL and compared to neem oil and cinnamaldehyde(as standard positive controls). Phytochemical analysis of the ethyl acetate extract was done through a number of chromatographic techniques and the structures of the isolated compounds were established through comprehensive spectroscopic analysis including 2 D-NMR and ESI-MS studies.Results: Fractionation of the active ethyl acetate extract resulted in the isolation of one known anthraquinone,aurantio-obtusin(1) and a novel compound that was named as cassiatorin(2). Compounds1 and 2 showed comparable insect antifeedant properties with the positive controls while their insecticidal and ovipositor deterrent effects were far superior to the standard controls.Conclusions: It is thus concluded that Senna tora extracts and the isolated compounds(1 and2) may be employed in the postharvest management of stored cowpea seeds and as other crop protectants. 展开更多
关键词 Senna tora Cassia tora Cassiatorin AURANTIO-OBTUSIN Insecticidal Ovipositor deterrent ANTIFEEDANT Cowpea weevil
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Efficacies of four plant essential oils as larvicide, pupicide and oviposition deterrent agents against dengue fever mosquito, Aedes aegypti Linn.(Diptera: Culicidae) 被引量:1
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作者 Aksorn Chantawee Mayura Soonwera 《Asian Pacific Journal of Tropical Biomedicine》 SCIE CAS 2018年第4期217-225,共9页
Objective:To evaluate larvicidal,pupicidal and oviposition deterrent activities of four plant essential oils from Alpinia galanga(L.)Willd rhizome,Anethum graveolens L.(An.graveolens)fruit,Foeniculum vulgare Mill.frui... Objective:To evaluate larvicidal,pupicidal and oviposition deterrent activities of four plant essential oils from Alpinia galanga(L.)Willd rhizome,Anethum graveolens L.(An.graveolens)fruit,Foeniculum vulgare Mill.fruit,and Pimpinella anisum L.fruit against Aedes aegypti(Ae.aegypti).Methods:Four essential oils at 1%,5%and 10%concentrations were assessed for insecticidal activity against larvae and pupae of Ae.aegypti,following the procedure of a dipping method assay.Oviposition deterrent activity of four essential oils was evaluated on gravid female of Ae.aegypti by a dual-choice oviposition bioassay.Results:The results revealed that An.graveolens oil provided the strongest larvicidal activity against Ae.aegypti among four tested plant essential oils with the highest mortality rate of 100%and LC_(50)value of-0.3%.From the pupicidal experiment,An.graveolens also showed the highest toxicity against Ae.aegypti pupae with the highest mortality rate of 100%at 72 h and LC_(50)value of2.9%.In addition,10%An.graveolens had an oviposition deterrent effect against Ae.aegypti with effective repellency of 100%and an oviposition activity index of-1.0.Conclusions:An.graveolens oil has a good potential as a larvicidal,pupicidal and oviposition deterrent agent for controlling Ae.aegypti. 展开更多
关键词 Aedes aegypti Plant essential oils LARVICIDE Pupicide Oviposition deterrent
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The Influence of Phlorotannins and Bromophenols on the Feeding Behavior of Marine Herbivorous Gastropod <i>Turbo cornutus</i> 被引量:2
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作者 Toshiyuki Shibata Taiko Miyasaki +2 位作者 Hideo Miyake Reiji Tanaka Shigeo Kawaguchi 《American Journal of Plant Sciences》 2014年第3期387-392,共6页
The influence of phlorotannins and bromophenols on the feeding behavior of marine herbivores was determined using bioassay of Turbo cornutus. It was found that phloroglucinol and its oligomers isolated from the brown ... The influence of phlorotannins and bromophenols on the feeding behavior of marine herbivores was determined using bioassay of Turbo cornutus. It was found that phloroglucinol and its oligomers isolated from the brown alga Eisenia bicyclis (eckol, fucofuroeckol A, phlorofucofuroeckol A, dieckol, and 8,8’-bieckol) had a deterrent effect against feeding behavior of T. cornutus in the concentration of algal body, respectively. In the case of the examination of 0.1 mM concentration, although fucofuroeckol A and phlorofucofuroeckol A significantly reduced feeding by T. cornutus, phloroglucinol and 8,8’-bieckol did not show any significant influence on feeding behavior, and eckol and dieckol had stimulating activity. 2,4-Dibromophenol and 2,4,6-tribromophenol, which are major components of extracellular secretions from Eisenia and Ecklonia species, caused the death, the torpidity, and the decreased appetite of T. cornutus at the concentration of 0.1 mM. In addition, 2,4-dibromophenol had strong feeding deterrent activity at the concentration of 1 μM. These results indicate that phlorotannins and bromophenols act as chemical defense agents of brown algae against environmental stresses such as the herbivore attack. 展开更多
关键词 BROMOPHENOLS Brown Algae Chemical Defenses Feeding DETERRENT Eisenia bicyclis PHLOROTANNINS Plant-Herbivore Interactions Turban Shell Turbo cornutus
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