The Experts below are selected from a list of 31974 Experts worldwide ranked by ideXlab platform
Naftaly Zieslin - One of the best experts on this subject based on the ideXlab platform.
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MECHANICAL STRENGTH AND ANATOMICAL STRUCTURE OF THE PeduncleS OF ROSE (ROSA × HYBRIDA) FLOWERS
Israel journal of botany, 2013Co-Authors: Eliezer Zamski, Fredy Starkman, Naftaly ZieslinAbstract:ABSTRACT The anatomical differences between the strong flower Peduncles of the rose cv. Mercedes and the weak Peduncles of cv. Nubia were investigated. More supporting cells with thicker cell walls were found in the xylem elements and phloem fibers of the cv. Mercedes Peduncles than in those of cv. Nubia. Secondary increment was observed in the proximal zone of the Peduncles of both cultivars. A complete ring of secondary thickening developed in the Peduncles of cv. Mercedes, whereas in cv. Nubia the ring was incomplete due to the lack of interfascicular cambium. These differences were correlated with the postharvest tendency to Peduncle bending of these two cultivars.
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Abscission of flower Peduncles in rose (Rosa × hybrida) plants
Scientia Horticulturae, 1993Co-Authors: Danuta M. Goszczynska, Naftaly ZieslinAbstract:Abstract Abscission of flower buds was not observed when plants or harvested flowers of rose cultivars ‘Nubia’ and ‘Celica’, grown for cut flowers were kept for 3 weeks at 22°C in the dark. However, all young buds of the miniature rose cultivar ‘Orange Meillandina’ abscised after 6 days of darkness. Removal of buds at early stages of development resulted in abscission of Peduncles left intact on the plant in all cultivars examined. Girdling of the stem combined with defoliation postponed the abscission of decapitated Peduncles of ‘Nubia’ in situ. The time to abscission of decapitated Peduncles in explants was similar to that on the plants in situ. Abscission of Peduncles, although delayed, was also present in non-decapitated explants of ‘Nubia’, ‘Celica’, and ‘Yellow Meillandina’ with young buds. In contrast, in the whole plant, darkness did not induce abscission in non-decapitated explants of ‘Orange Meillandina’. Abscission of decapitated Peduncles of ‘Nubia’ on the plant was postponed by application of either indoleacetic acid (IAA) or gibberellin (GA3), while only IAA applied to the distal end of the Peduncle inhibited Peduncle abscission in explants. The abscission of decapitated Peduncles in explants was promoted by abscisic acid (ABA) and in non-decapitated explants by application of 2,3,5-triiodobenzoic acid (TIBA) as a lanolin ring beneath the bud. The possible involvement of three components originated in flower buds, leaves or roots in the phenomenon of flower bud abscission in rose plants is discussed.
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The relationship between changes in lignification and the mechanical strength of rose flower Peduncles
Acta Botanica Neerlandica, 1993Co-Authors: B. Chabbert, Naftaly Zieslin, B. Monties, R. Ben-zakenAbstract:The resistance to bending of rose flower Peduncle is important to the post-harvest quality of rose flowers. The content and composition of lignin was determined in respectively strong and weak Peduncles of Rosa × hybrida cv. Mercedes and Nubia. Xylem tissues of the Peduncles of the stronger cv. Mercedes were more lignified than in the weaker cv. Nubia. However, phloem lignin content was increased only in the basal parts of the Peduncles of cv. Mercedes. Differences in the monomeric composition of lignins were apparent between cultivars. In both the phloem and xylem fractions, lignin in the Peduncles of cv. Mercedes was less condensed than in the weaker cultivar Nubia. Furthermore, lignin rich in syringyl monomeric units occurred in the distal parts of the strong Peduncles, accounting for the higher S/G ratio observed in the stronger Peduncles compared to the weaker ones
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Abscission of Flower Peduncles in Rose (Rosa × hybrida) Plants and Evolution of Ethylene
Journal of Plant Physiology, 1993Co-Authors: Danuta M. Goszczynska, Naftaly ZieslinAbstract:Summary Ethylene evolution from decapitated rose ( Rosa × hybrida cv. Nubia) Peduncles in planta and explants showed a climacteric pattern typical of abscising plant organs. The rate of ethylene evolution from nondecapitated explants was higher than that from decapitated ones and was the highest from separated flower buds. Local application of IAA at the site of bud removal postponed abscission of decapitated Peduncles by 10 days in comparison with decapitated Peduncles without IAA. The inhibition of abscission with IAA was accompanied by an earlier and higher rise in ethylene evolution and by yellowing of the Peduncles; basal application of STS (silver thiosulphate) postponed the abscission of decapitated Peduncles for a period longer than 6 weeks without any visible symptoms of senescence and was also associated with increased evolution of ethylene. Application of 1-aminocyclopropane-1-carboxylic acid (ACC) stimulated evolution of ethylene and promoted abscission of non-decapitated and decapitated Peduncles, as well as of Peduncles treated with IAA, but did not affect the STS-imposed inhibition of Peduncle abscission. An extremely high rise in ethylene was measured without affecting abscission when STS and IAA treatments were combined. The role of auxin in context of the concept of «tissue sensitivity» to ethylene is discussed. A possible existence of two separate ethylene systems, one involved in regulation of flower bud development and the second in regulation of flower bud and leaf absiccion, is discussed.
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Effects of applied auxin, gibberellin and cytokinin on the activity of peroxidases in the Peduncles of rose flowers
Plant Growth Regulation, 1992Co-Authors: Naftaly Zieslin, Rachel Ben-zakenAbstract:The activity of peroxidases in the proximal part of the flower Peduncle of rose cv. Nubia was promoted by exogenous application of auxin but not by gibberellin or cytokinin. In cv. Mercedes the activity was promoted also by gibberellin and cytokinin. In the distal parts of the Peduncles of both cultivars, peroxidase activity was not affected by any of the applied growth regulators. In young flowers of cv. Nubia the protein content of the penduncles was affected only by cytokinin, and in aged flowers only by auxin, while in “Mercedes” Peduncles the content of protein was not affected by any of the applied growth regulators. The specific activity of peroxidases was promoted by auxin in Peduncles of Nubia and by both auxin and cytokinin in Peduncles of “Mercedes” flowers.
Toshihiko Kinoshita - One of the best experts on this subject based on the ideXlab platform.
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neural disorganization in the superior cerebellar Peduncle and cognitive abnormality in patients with schizophrenia a diffusion tensor imaging study
Progress in Neuro-psychopharmacology & Biological Psychiatry, 2006Co-Authors: Gaku Okugawa, Kenji Nobuhara, Tomohisa Minami, Katsunori Takase, Tatsuya Sugimoto, Yukiko Saito, Masafumi Yoshimura, Toshihiko KinoshitaAbstract:Disconnection in the frontal-thalamic-cerebellar circuit is thought to be associated with cognitive abnormality in patients with schizophrenia. The superior cerebellar Peduncle is involved in neural connectivity in the circuit. Because diffusion tensor imaging (DTI) can detect neural disconnection, we investigated whether there was neural disruption in the superior cerebellar Peduncle in patients with schizophrenia. DTI was performed in 21 schizophrenic subjects and 21 age- and sex-matched healthy subjects. Cognitive cluster scores were attained by using the Positive and Negative Syndrome Scale (PANSS). Schizophrenic subjects had significantly lower fractional anisotropy (FA) in the right and left superior cerebellar Peduncles than healthy subjects. Higher FA in the left superior cerebellar Peduncle was associated with worse cognitive function in patients with schizophrenia. These findings suggest that there is neural disruption in the superior cerebellar Peduncle in patients with schizophrenia, which may be involved in the cognitive abnormalities found in schizophrenia.
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Diffusion tensor imaging study of the middle cerebellar Peduncles in patients with schizophrenia
Cerebellum (London England), 2005Co-Authors: Gaku Okugawa, Kenji Nobuhara, Tatsuya Sugimoto, Toshihiko KinoshitaAbstract:Recent evidence from neuroimaging studies suggests that neural dysfunction is involved in the pathophysiology of schizophrenia. Diffusion tensor imaging (DTI) is a technique that has the potential to detect subtle disruptions of neural connectivity. Fractional anisotropy (FA), which is measured by DTI, is a measure of the directionality of diffusion anisotropy. Decrease in FA indicates abnormalities of white matter due to increased water diffusion accompanied by an increase in extracellular space. In the literature, previous studies reported that patients with schizophrenia showed widespread lower FA in the white matter. These findings suggest that patients with schizophrenia have microstructural lesions in the cerebral white matter. We used DTI to determine whether neural connectivity was disturbed in the middle cerebellar Peduncles in schizophrenic subjects. We found a significant FA reduction in the middle cerebellar Peduncle in patients with schizophrenia. Therefore, neural disconnectivity between the cerebellum and cerebrum was considered present in patients with schizophrenia and may be involved in the pathology of schizophrenia. This review provides current findings regarding DTI study on the cerebellar Peduncle in patients with schizophrenia.
Athole H. Marshall - One of the best experts on this subject based on the ideXlab platform.
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Peduncle characteristics, inflorescence survival and reproductive growth of white clover (Trifolium repens L.)
Grass and Forage Science, 1995Co-Authors: Athole H. MarshallAbstract:Field experiments were carried out in four harvest years to compare the Peduncle characteristics and reproductive growth of the small-leaved white clover (Trifolium repens L.) cv. AberDale, selected for long and strong Peduncles, with other varieties bred in the Institute of Grassland and Environmental Research (IGER). The Peduncles of cv. AberDale were of larger diameter and had a greater fresh and dry weight than those of other varieties. There were also differences in structure as the Peduncles of cv. AberDale had more pronounced ridges and furrows than those of cv, Menna. Inflorescences of cv. AberDale and other varieties were tagged when in full bloom throughout the flowering period in each of the four harvest years. Generally, more inflorescences of cv. AberDale remained intact until harvest, particularly from the early tagging dates. Although there were seasonal differences, at harvest in each of the 4 years, cv. AberDale had more inflorescences and seeds per floret and a greater potential seed yield than the other varieties. The basis of Peduncle strength and effect on reproductive growth is discussed, and the implications for improving the seed yield potential of white clover varieties is considered.
Tristan Perez - One of the best experts on this subject based on the ideXlab platform.
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Peduncle detection of sweet pepper for autonomous crop harvesting combined color and 3 d information
International Conference on Robotics and Automation, 2017Co-Authors: Christopher Lehnert, Andrew English, Chris Mccool, Feras Dayoub, Ben Upcroft, Tristan PerezAbstract:This paper presents a 3D visual detection method for the challenging task of detecting Peduncles of sweet peppers (Capsicum annuum) in the field. Cutting the Peduncle cleanly is one of the most difficult stages of the harvesting process, where the Peduncle is the part of the crop that attaches it to the main stem of the plant. Accurate Peduncle detection in 3D space is therefore a vital step in reliable autonomous harvesting of sweet peppers, as this can lead to precise cutting while avoiding damage to the surrounding plant. This paper makes use of both colour and geometry information acquired from an RGB-D sensor and utilises a supervised-learning approach for the Peduncle detection task. The performance of the proposed method is demonstrated and evaluated using qualitative and quantitative results (the Area-Under-the-Curve (AUC) of the detection precision-recall curve). We are able to achieve an AUC of 0.71 for Peduncle detection on field-grown sweet peppers. We release a set of manually annotated 3D sweet pepper and Peduncle images to assist the research community in performing further research on this topic.
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Peduncle Detection of Sweet Pepper for Autonomous Crop Harvesting—Combined Color and 3-D Information
IEEE Robotics and Automation Letters, 2017Co-Authors: Christopher Lehnert, Andrew English, Chris Mccool, Feras Dayoub, Ben Upcroft, Tristan PerezAbstract:This paper presents a 3D visual detection method for the challenging task of detecting Peduncles of sweet peppers (Capsicum annuum) in the field. Cutting the Peduncle cleanly is one of the most difficult stages of the harvesting process, where the Peduncle is the part of the crop that attaches it to the main stem of the plant. Accurate Peduncle detection in 3D space is therefore a vital step in reliable autonomous harvesting of sweet peppers, as this can lead to precise cutting while avoiding damage to the surrounding plant. This paper makes use of both colour and geometry information acquired from an RGB-D sensor and utilises a supervised-learning approach for the Peduncle detection task. The performance of the proposed method is demonstrated and evaluated using qualitative and quantitative results (the Area-Under-the-Curve (AUC) of the detection precision-recall curve). We are able to achieve an AUC of 0.71 for Peduncle detection on field-grown sweet peppers. We release a set of manually annotated 3D sweet pepper and Peduncle images to assist the research community in performing further research on this topic.
Gaku Okugawa - One of the best experts on this subject based on the ideXlab platform.
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neural disorganization in the superior cerebellar Peduncle and cognitive abnormality in patients with schizophrenia a diffusion tensor imaging study
Progress in Neuro-psychopharmacology & Biological Psychiatry, 2006Co-Authors: Gaku Okugawa, Kenji Nobuhara, Tomohisa Minami, Katsunori Takase, Tatsuya Sugimoto, Yukiko Saito, Masafumi Yoshimura, Toshihiko KinoshitaAbstract:Disconnection in the frontal-thalamic-cerebellar circuit is thought to be associated with cognitive abnormality in patients with schizophrenia. The superior cerebellar Peduncle is involved in neural connectivity in the circuit. Because diffusion tensor imaging (DTI) can detect neural disconnection, we investigated whether there was neural disruption in the superior cerebellar Peduncle in patients with schizophrenia. DTI was performed in 21 schizophrenic subjects and 21 age- and sex-matched healthy subjects. Cognitive cluster scores were attained by using the Positive and Negative Syndrome Scale (PANSS). Schizophrenic subjects had significantly lower fractional anisotropy (FA) in the right and left superior cerebellar Peduncles than healthy subjects. Higher FA in the left superior cerebellar Peduncle was associated with worse cognitive function in patients with schizophrenia. These findings suggest that there is neural disruption in the superior cerebellar Peduncle in patients with schizophrenia, which may be involved in the cognitive abnormalities found in schizophrenia.
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Diffusion tensor imaging study of the middle cerebellar Peduncles in patients with schizophrenia
Cerebellum (London England), 2005Co-Authors: Gaku Okugawa, Kenji Nobuhara, Tatsuya Sugimoto, Toshihiko KinoshitaAbstract:Recent evidence from neuroimaging studies suggests that neural dysfunction is involved in the pathophysiology of schizophrenia. Diffusion tensor imaging (DTI) is a technique that has the potential to detect subtle disruptions of neural connectivity. Fractional anisotropy (FA), which is measured by DTI, is a measure of the directionality of diffusion anisotropy. Decrease in FA indicates abnormalities of white matter due to increased water diffusion accompanied by an increase in extracellular space. In the literature, previous studies reported that patients with schizophrenia showed widespread lower FA in the white matter. These findings suggest that patients with schizophrenia have microstructural lesions in the cerebral white matter. We used DTI to determine whether neural connectivity was disturbed in the middle cerebellar Peduncles in schizophrenic subjects. We found a significant FA reduction in the middle cerebellar Peduncle in patients with schizophrenia. Therefore, neural disconnectivity between the cerebellum and cerebrum was considered present in patients with schizophrenia and may be involved in the pathology of schizophrenia. This review provides current findings regarding DTI study on the cerebellar Peduncle in patients with schizophrenia.
