The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Marcel Dicke - One of the best experts on this subject based on the ideXlab platform.
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relationship between the ability to penetrate complex webs of tetranychus spider mites and the ability of Thread Cutting behavior in phytoseiid predatory mites
Biological Control, 2010Co-Authors: Takeshi Shimoda, Hidenari Kishimoto, Junji Takabayashi, Hiroshi Amano, Marcel DickeAbstract:Predatory mites, that are important natural enemies of Tetranychus spider mites, are less hindered by complex webs of the spider mites than are other predatory mites that are natural enemies of other pest herbivores. This can be partly explained by their chaetotaxy, a morphological protection against the webs. However, it has up to now been unclear whether the ability to penetrate complex webs is related to the ability of Thread-Cutting behavior to reduce the effects of the webs. The two predatory mites Neo-seiulus cucumeris and Typhlodromus vulgaris, that are natural enemies of other pest herbivores, were often entrapped by the sticky silken Threads while moving within the complex web produced by the two-spotted spider mites Tetranychus urticae. Once captured, their movements and foraging activities were hindered until their escape from entrapment. In contrast, N. womersleyi and Phytoseiulus persimilis, that are important natural enemies of Tetranychus mites, were significantly less frequently entrapped by the web and for shorter periods. Furthermore, N. womersleyi and P. persimilis cut significantly more silken Threads within the web than did N. cucumeris and T. vulgaris. The different behavioral activities exhibited by N. cucumeris and N. womersleyi could not be explained by their rearing conditions (i.e., past experience with complex webs). These results supported the hypothesis and might offer an ecological indicator for distinguishing potential important natural enemies of Tetranychus mites from less useful types. (c) 2010 Elsevier Inc. All rights reserved.
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relationship between the ability to penetrate complex webs of tetranychus spider mites and the ability of Thread Cutting behavior in phytoseiid predatory mites
Biological Control, 2010Co-Authors: Takeshi Shimoda, Hidenari Kishimoto, Junji Takabayashi, Hiroshi Amano, Marcel DickeAbstract:Abstract Predatory mites, that are important natural enemies of Tetranychus spider mites, are less hindered by complex webs of the spider mites than are other predatory mites that are natural enemies of other pest herbivores. This can be partly explained by their chaetotaxy, a morphological protection against the webs. However, it has up to now been unclear whether the ability to penetrate complex webs is related to the ability of Thread-Cutting behavior to reduce the effects of the webs. The two predatory mites Neoseiulus cucumeris and Typhlodromus vulgaris, that are natural enemies of other pest herbivores, were often entrapped by the sticky silken Threads while moving within the complex web produced by the two-spotted spider mites Tetranychus urticae. Once captured, their movements and foraging activities were hindered until their escape from entrapment. In contrast, N. womersleyi and Phytoseiulus persimilis, that are important natural enemies of Tetranychus mites, were significantly less frequently entrapped by the web and for shorter periods. Furthermore, N. womersleyi and P. persimilis cut significantly more silken Threads within the web than did N. cucumeris and T. vulgaris. The different behavioral activities exhibited by N. cucumeris and N. womersleyi could not be explained by their rearing conditions (i.e., past experience with complex webs). These results supported the hypothesis and might offer an ecological indicator for distinguishing potential important natural enemies of Tetranychus mites from less useful types.
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comparison of Thread Cutting behavior in three specialist predatory mites to cope with complex webs of tetranychus spider mites
Experimental and Applied Acarology, 2009Co-Authors: Takeshi Shimoda, Hidenari Kishimoto, Junji Takabayashi, Hiroshi Amano, Marcel DickeAbstract:Anti-predator defenses provided by complex webs of Tetranychus mites can severely impede the performance of generalist predatory mites, whereas this may not be true for specialist predatory mites. Although some specialist predatory mites have developed morphological protection to reduce the adverse effects of complex webs, little is known about their behavioral abilities to cope with the webs. In this study, we compared Thread-Cutting behavior of three specialist predatory mites, Phytoseiulus persimilis, Neoseiuluswomersleyi and N. californicus, exhibited inside the complex web of T. urticae. No major difference was observed among them in the basic pattern of this behavior, using chelicerae and palps, and in the number of silken Threads severed while moving inside the web. These results and observations suggest that each predator species cut many sticky silken Threads to move inside the complex web without suffering from serious obstruction.
Takeshi Shimoda - One of the best experts on this subject based on the ideXlab platform.
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relationship between the ability to penetrate complex webs of tetranychus spider mites and the ability of Thread Cutting behavior in phytoseiid predatory mites
Biological Control, 2010Co-Authors: Takeshi Shimoda, Hidenari Kishimoto, Junji Takabayashi, Hiroshi Amano, Marcel DickeAbstract:Predatory mites, that are important natural enemies of Tetranychus spider mites, are less hindered by complex webs of the spider mites than are other predatory mites that are natural enemies of other pest herbivores. This can be partly explained by their chaetotaxy, a morphological protection against the webs. However, it has up to now been unclear whether the ability to penetrate complex webs is related to the ability of Thread-Cutting behavior to reduce the effects of the webs. The two predatory mites Neo-seiulus cucumeris and Typhlodromus vulgaris, that are natural enemies of other pest herbivores, were often entrapped by the sticky silken Threads while moving within the complex web produced by the two-spotted spider mites Tetranychus urticae. Once captured, their movements and foraging activities were hindered until their escape from entrapment. In contrast, N. womersleyi and Phytoseiulus persimilis, that are important natural enemies of Tetranychus mites, were significantly less frequently entrapped by the web and for shorter periods. Furthermore, N. womersleyi and P. persimilis cut significantly more silken Threads within the web than did N. cucumeris and T. vulgaris. The different behavioral activities exhibited by N. cucumeris and N. womersleyi could not be explained by their rearing conditions (i.e., past experience with complex webs). These results supported the hypothesis and might offer an ecological indicator for distinguishing potential important natural enemies of Tetranychus mites from less useful types. (c) 2010 Elsevier Inc. All rights reserved.
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relationship between the ability to penetrate complex webs of tetranychus spider mites and the ability of Thread Cutting behavior in phytoseiid predatory mites
Biological Control, 2010Co-Authors: Takeshi Shimoda, Hidenari Kishimoto, Junji Takabayashi, Hiroshi Amano, Marcel DickeAbstract:Abstract Predatory mites, that are important natural enemies of Tetranychus spider mites, are less hindered by complex webs of the spider mites than are other predatory mites that are natural enemies of other pest herbivores. This can be partly explained by their chaetotaxy, a morphological protection against the webs. However, it has up to now been unclear whether the ability to penetrate complex webs is related to the ability of Thread-Cutting behavior to reduce the effects of the webs. The two predatory mites Neoseiulus cucumeris and Typhlodromus vulgaris, that are natural enemies of other pest herbivores, were often entrapped by the sticky silken Threads while moving within the complex web produced by the two-spotted spider mites Tetranychus urticae. Once captured, their movements and foraging activities were hindered until their escape from entrapment. In contrast, N. womersleyi and Phytoseiulus persimilis, that are important natural enemies of Tetranychus mites, were significantly less frequently entrapped by the web and for shorter periods. Furthermore, N. womersleyi and P. persimilis cut significantly more silken Threads within the web than did N. cucumeris and T. vulgaris. The different behavioral activities exhibited by N. cucumeris and N. womersleyi could not be explained by their rearing conditions (i.e., past experience with complex webs). These results supported the hypothesis and might offer an ecological indicator for distinguishing potential important natural enemies of Tetranychus mites from less useful types.
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comparison of Thread Cutting behavior in three specialist predatory mites to cope with complex webs of tetranychus spider mites
Experimental and Applied Acarology, 2009Co-Authors: Takeshi Shimoda, Hidenari Kishimoto, Junji Takabayashi, Hiroshi Amano, Marcel DickeAbstract:Anti-predator defenses provided by complex webs of Tetranychus mites can severely impede the performance of generalist predatory mites, whereas this may not be true for specialist predatory mites. Although some specialist predatory mites have developed morphological protection to reduce the adverse effects of complex webs, little is known about their behavioral abilities to cope with the webs. In this study, we compared Thread-Cutting behavior of three specialist predatory mites, Phytoseiulus persimilis, Neoseiuluswomersleyi and N. californicus, exhibited inside the complex web of T. urticae. No major difference was observed among them in the basic pattern of this behavior, using chelicerae and palps, and in the number of silken Threads severed while moving inside the web. These results and observations suggest that each predator species cut many sticky silken Threads to move inside the complex web without suffering from serious obstruction.
G Benga - One of the best experts on this subject based on the ideXlab platform.
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application of ultra thin fluorine content lubricating films to reduce tool workpiece adhesive interaction during Thread Cutting operations
International Journal of Machine Tools & Manufacture, 2007Co-Authors: S C Veldhuis, G K Dosbaeva, G BengaAbstract:Abstract This paper considers the application of lubricious fluorine-organic-based surface-active substances such as perfluorpolyether (PFPE) films for Thread-Cutting operations. The coefficient of friction of samples prepared both with and without the lubricating film was studied over a range of temperatures from 20 to 550 °C, to test the potential for this film to reduce tool/workpiece adhesive interaction. An 18% reduction in the coefficient of friction was observed at temperatures as high as 400–450 °C for this film. This temperature is within the typical range of Thread-tapping operations. To explore this potential application further, the PFPE films were applied on the surface of Thread-Cutting taps made of high-speed steel. Cutting tool life was also investigated for regular, spiral point, and spiral tap designs, both with and without the PFPE films. The surface morphology of the worn-Cutting tools was studied using an SEM and the shape as well as the micro-structure of the chips was also investigated in detail. Overall it was shown that the application of the PFPE film improved the Cutting tool life by a factor of two, decreased the average Cutting torque by 8% and produced tightly curled chips.
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Application of ultra-thin fluorine-content lubricating films to reduce tool/workpiece adhesive interaction during Thread-Cutting operations
International Journal of Machine Tools & Manufacture, 2007Co-Authors: S C Veldhuis, G K Dosbaeva, G BengaAbstract:Abstract This paper considers the application of lubricious fluorine-organic-based surface-active substances such as perfluorpolyether (PFPE) films for Thread-Cutting operations. The coefficient of friction of samples prepared both with and without the lubricating film was studied over a range of temperatures from 20 to 550 °C, to test the potential for this film to reduce tool/workpiece adhesive interaction. An 18% reduction in the coefficient of friction was observed at temperatures as high as 400–450 °C for this film. This temperature is within the typical range of Thread-tapping operations. To explore this potential application further, the PFPE films were applied on the surface of Thread-Cutting taps made of high-speed steel. Cutting tool life was also investigated for regular, spiral point, and spiral tap designs, both with and without the PFPE films. The surface morphology of the worn-Cutting tools was studied using an SEM and the shape as well as the micro-structure of the chips was also investigated in detail. Overall it was shown that the application of the PFPE film improved the Cutting tool life by a factor of two, decreased the average Cutting torque by 8% and produced tightly curled chips.
Junji Takabayashi - One of the best experts on this subject based on the ideXlab platform.
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relationship between the ability to penetrate complex webs of tetranychus spider mites and the ability of Thread Cutting behavior in phytoseiid predatory mites
Biological Control, 2010Co-Authors: Takeshi Shimoda, Hidenari Kishimoto, Junji Takabayashi, Hiroshi Amano, Marcel DickeAbstract:Predatory mites, that are important natural enemies of Tetranychus spider mites, are less hindered by complex webs of the spider mites than are other predatory mites that are natural enemies of other pest herbivores. This can be partly explained by their chaetotaxy, a morphological protection against the webs. However, it has up to now been unclear whether the ability to penetrate complex webs is related to the ability of Thread-Cutting behavior to reduce the effects of the webs. The two predatory mites Neo-seiulus cucumeris and Typhlodromus vulgaris, that are natural enemies of other pest herbivores, were often entrapped by the sticky silken Threads while moving within the complex web produced by the two-spotted spider mites Tetranychus urticae. Once captured, their movements and foraging activities were hindered until their escape from entrapment. In contrast, N. womersleyi and Phytoseiulus persimilis, that are important natural enemies of Tetranychus mites, were significantly less frequently entrapped by the web and for shorter periods. Furthermore, N. womersleyi and P. persimilis cut significantly more silken Threads within the web than did N. cucumeris and T. vulgaris. The different behavioral activities exhibited by N. cucumeris and N. womersleyi could not be explained by their rearing conditions (i.e., past experience with complex webs). These results supported the hypothesis and might offer an ecological indicator for distinguishing potential important natural enemies of Tetranychus mites from less useful types. (c) 2010 Elsevier Inc. All rights reserved.
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relationship between the ability to penetrate complex webs of tetranychus spider mites and the ability of Thread Cutting behavior in phytoseiid predatory mites
Biological Control, 2010Co-Authors: Takeshi Shimoda, Hidenari Kishimoto, Junji Takabayashi, Hiroshi Amano, Marcel DickeAbstract:Abstract Predatory mites, that are important natural enemies of Tetranychus spider mites, are less hindered by complex webs of the spider mites than are other predatory mites that are natural enemies of other pest herbivores. This can be partly explained by their chaetotaxy, a morphological protection against the webs. However, it has up to now been unclear whether the ability to penetrate complex webs is related to the ability of Thread-Cutting behavior to reduce the effects of the webs. The two predatory mites Neoseiulus cucumeris and Typhlodromus vulgaris, that are natural enemies of other pest herbivores, were often entrapped by the sticky silken Threads while moving within the complex web produced by the two-spotted spider mites Tetranychus urticae. Once captured, their movements and foraging activities were hindered until their escape from entrapment. In contrast, N. womersleyi and Phytoseiulus persimilis, that are important natural enemies of Tetranychus mites, were significantly less frequently entrapped by the web and for shorter periods. Furthermore, N. womersleyi and P. persimilis cut significantly more silken Threads within the web than did N. cucumeris and T. vulgaris. The different behavioral activities exhibited by N. cucumeris and N. womersleyi could not be explained by their rearing conditions (i.e., past experience with complex webs). These results supported the hypothesis and might offer an ecological indicator for distinguishing potential important natural enemies of Tetranychus mites from less useful types.
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comparison of Thread Cutting behavior in three specialist predatory mites to cope with complex webs of tetranychus spider mites
Experimental and Applied Acarology, 2009Co-Authors: Takeshi Shimoda, Hidenari Kishimoto, Junji Takabayashi, Hiroshi Amano, Marcel DickeAbstract:Anti-predator defenses provided by complex webs of Tetranychus mites can severely impede the performance of generalist predatory mites, whereas this may not be true for specialist predatory mites. Although some specialist predatory mites have developed morphological protection to reduce the adverse effects of complex webs, little is known about their behavioral abilities to cope with the webs. In this study, we compared Thread-Cutting behavior of three specialist predatory mites, Phytoseiulus persimilis, Neoseiuluswomersleyi and N. californicus, exhibited inside the complex web of T. urticae. No major difference was observed among them in the basic pattern of this behavior, using chelicerae and palps, and in the number of silken Threads severed while moving inside the web. These results and observations suggest that each predator species cut many sticky silken Threads to move inside the complex web without suffering from serious obstruction.
Hiroshi Amano - One of the best experts on this subject based on the ideXlab platform.
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relationship between the ability to penetrate complex webs of tetranychus spider mites and the ability of Thread Cutting behavior in phytoseiid predatory mites
Biological Control, 2010Co-Authors: Takeshi Shimoda, Hidenari Kishimoto, Junji Takabayashi, Hiroshi Amano, Marcel DickeAbstract:Predatory mites, that are important natural enemies of Tetranychus spider mites, are less hindered by complex webs of the spider mites than are other predatory mites that are natural enemies of other pest herbivores. This can be partly explained by their chaetotaxy, a morphological protection against the webs. However, it has up to now been unclear whether the ability to penetrate complex webs is related to the ability of Thread-Cutting behavior to reduce the effects of the webs. The two predatory mites Neo-seiulus cucumeris and Typhlodromus vulgaris, that are natural enemies of other pest herbivores, were often entrapped by the sticky silken Threads while moving within the complex web produced by the two-spotted spider mites Tetranychus urticae. Once captured, their movements and foraging activities were hindered until their escape from entrapment. In contrast, N. womersleyi and Phytoseiulus persimilis, that are important natural enemies of Tetranychus mites, were significantly less frequently entrapped by the web and for shorter periods. Furthermore, N. womersleyi and P. persimilis cut significantly more silken Threads within the web than did N. cucumeris and T. vulgaris. The different behavioral activities exhibited by N. cucumeris and N. womersleyi could not be explained by their rearing conditions (i.e., past experience with complex webs). These results supported the hypothesis and might offer an ecological indicator for distinguishing potential important natural enemies of Tetranychus mites from less useful types. (c) 2010 Elsevier Inc. All rights reserved.
-
relationship between the ability to penetrate complex webs of tetranychus spider mites and the ability of Thread Cutting behavior in phytoseiid predatory mites
Biological Control, 2010Co-Authors: Takeshi Shimoda, Hidenari Kishimoto, Junji Takabayashi, Hiroshi Amano, Marcel DickeAbstract:Abstract Predatory mites, that are important natural enemies of Tetranychus spider mites, are less hindered by complex webs of the spider mites than are other predatory mites that are natural enemies of other pest herbivores. This can be partly explained by their chaetotaxy, a morphological protection against the webs. However, it has up to now been unclear whether the ability to penetrate complex webs is related to the ability of Thread-Cutting behavior to reduce the effects of the webs. The two predatory mites Neoseiulus cucumeris and Typhlodromus vulgaris, that are natural enemies of other pest herbivores, were often entrapped by the sticky silken Threads while moving within the complex web produced by the two-spotted spider mites Tetranychus urticae. Once captured, their movements and foraging activities were hindered until their escape from entrapment. In contrast, N. womersleyi and Phytoseiulus persimilis, that are important natural enemies of Tetranychus mites, were significantly less frequently entrapped by the web and for shorter periods. Furthermore, N. womersleyi and P. persimilis cut significantly more silken Threads within the web than did N. cucumeris and T. vulgaris. The different behavioral activities exhibited by N. cucumeris and N. womersleyi could not be explained by their rearing conditions (i.e., past experience with complex webs). These results supported the hypothesis and might offer an ecological indicator for distinguishing potential important natural enemies of Tetranychus mites from less useful types.
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comparison of Thread Cutting behavior in three specialist predatory mites to cope with complex webs of tetranychus spider mites
Experimental and Applied Acarology, 2009Co-Authors: Takeshi Shimoda, Hidenari Kishimoto, Junji Takabayashi, Hiroshi Amano, Marcel DickeAbstract:Anti-predator defenses provided by complex webs of Tetranychus mites can severely impede the performance of generalist predatory mites, whereas this may not be true for specialist predatory mites. Although some specialist predatory mites have developed morphological protection to reduce the adverse effects of complex webs, little is known about their behavioral abilities to cope with the webs. In this study, we compared Thread-Cutting behavior of three specialist predatory mites, Phytoseiulus persimilis, Neoseiuluswomersleyi and N. californicus, exhibited inside the complex web of T. urticae. No major difference was observed among them in the basic pattern of this behavior, using chelicerae and palps, and in the number of silken Threads severed while moving inside the web. These results and observations suggest that each predator species cut many sticky silken Threads to move inside the complex web without suffering from serious obstruction.
