The Experts below are selected from a list of 969 Experts worldwide ranked by ideXlab platform
Mehmet Bayindir - One of the best experts on this subject based on the ideXlab platform.
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biomimicry of multifunctional nanostructures in the neck feathers of mallard anas platyrhynchos l Drakes
Scientific Reports, 2015Co-Authors: Tural Khudiyev, Tamer Dogan, Mehmet BayindirAbstract:Biomimicry of multifunctional nanostructures in the neck feathers of mallard ( Anas platyrhynchos L.) Drakes
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Biomimicry of multifunctional nanostructures in the neck feathers of mallard (Anas platyrhynchos L.) Drakes
Scientific Reports, 2014Co-Authors: Tural Khudiyev, Tamer Dogan, Mehmet BayindirAbstract:Biological systems serve as fundamental sources of inspiration for the development of artificially colored devices and their investigation provides a great number of photonic design opportunities. While several successful biomimetic designs have been detailed in the literature, conventional fabrication techniques nonetheless remain inferior to their natural counterparts in complexity, ease of production and material economy. Here, we investigate the iridescent neck feathers of Anas platyrhynchos Drakes, show that they feature an unusual arrangement of two-dimensional (2D) photonic crystals and further exhibit a superhydrophobic surface and mimic this multifunctional structure using a nanostructure composite fabricated by a recently developed top-down iterative size reduction method, which avoids the above-mentioned fabrication challenges, provides macroscale control and enhances hydrophobicity through the surface structure. Our 2D solid core photonic crystal fibres strongly resemble drake neck plumage in structure and fully polymeric material composition and can be produced in wide array of colors by minor alterations during the size reduction process.
Gregory S Fraley - One of the best experts on this subject based on the ideXlab platform.
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low light intensity in pekin duck breeder barns has a greater impact on the fertility of Drakes than hens
Poultry Science, 2018Co-Authors: L. Porter, H Potter, E Alenciks, S M Fraley, A. Porter, Gregory S FraleyAbstract:The Pekin duck is an excellent model for the study of seasonal reproduction. To more completely understand the lighting requirements for maximal fertility in duck breeder houses, we housed adult (45 week old) Drakes and hens in the Hope College aviary as 5 Drakes and 25 hens. Light conditions in each floor pen were normalized based upon quantal energy and divided into the following categories: (1) to simulate summer, 14.5 h 65 lux with 9.5 h 1 lux; (2) to simulate winter, 8 h 65 lux with 16 h 1 lux; (3) winter augmented, 8 h 65 lux with 16 h at 15 lux. The experiment was repeated with rotation of light treatments among 3 pens until a final N = 6 was obtained. Daily, total number of eggs laid was tallied, and a daily average of eggs laid was calculated throughout the study. Weekly, eggs were weighed and the perivitilline membrane was assayed for the number of sperm holes as an indirect measure of drake fertility. As expected, winter conditions caused a reduction in the percent of eggs laid and a reduction in the number of fertilized eggs compared to the summer light conditions. The augmented winter light conditions prevented the loss in the percent eggs laid and fertilized eggs. Surprisingly, even after 4 wk of the study, the winter conditions did not cause a complete loss of fertility in the Pekin ducks. At the end of the study, no differences in the relative expression in brain deep brain photoreceptors or gonadotropin inhibitory hormone mRNAs were observed among any light treatment. Although a minimum (1 lux) of light can support some fertility, our findings suggest commercial Pekin duck barns may benefit from increasing the augmented light to 15 lux to maintain optimal fertility during winter months. Furthermore, our data suggest that Drakes may be more sensitive to environmental light conditions than hens.
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immunolesion of melanopsin neurons causes gonadal regression in pekin Drakes anas platyrhynchos domesticus
General and Comparative Endocrinology, 2018Co-Authors: H Potter, E Alenciks, K Frazier, A. Porter, Gregory S FraleyAbstract:Abstract Several light sensitive receptors have been described in the avian brain that are thought to regulate the reproductive axis independently from the eyes and pineal gland. Recently, our lab has described the presence of three of these photoneuroendocrine systems in the Pekin duck: opsin, opsin 5, & melanopsin. We set out to test the hypothesis that melanopsin receptive neurons are necessary to maintain seasonal reproductive status along with growth and development in the Pekin drake. To accomplish these goals we first investigated 50-week-old Pekin Drakes that were housed in the aviary at Hope College under long day length (18 h lights on) conditions in floor pens. To specifically lesion melanopsin-receptive neurons, 3 μl of an anti-melanopsin-saporin conjugate (MSAP, 100 ng/ul) was injected into the lateral ventricle (n = 10). Control Drakes were injected with 3 μl of equimolar unconjugated anti-melanopsin and saporin (SAP, n = 10). Reproductive behaviors were analyzed weekly in a test pen with adult hens and MSAP Drakes showed a significant (p
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immunolesion of melanopsin neurons causes gonadal regression in pekin Drakes anas platyrhynchos domesticus
General and Comparative Endocrinology, 2018Co-Authors: H Potter, E Alenciks, K Frazier, A. Porter, Gregory S FraleyAbstract:Several light sensitive receptors have been described in the avian brain that are thought to regulate the reproductive axis independently from the eyes and pineal gland. Recently, our lab has described the presence of three of these photoneuroendocrine systems in the Pekin duck: opsin, opsin 5, & melanopsin. We set out to test the hypothesis that melanopsin receptive neurons are necessary to maintain seasonal reproductive status along with growth and development in the Pekin drake. To accomplish these goals we first investigated 50-week-old Pekin Drakes that were housed in the aviary at Hope College under long day length (18h lights on) conditions in floor pens. To specifically lesion melanopsin-receptive neurons, 3μl of an anti-melanopsin-saporin conjugate (MSAP, 100ng/ul) was injected into the lateral ventricle (n=10). Control Drakes were injected with 3μl of equimolar unconjugated anti-melanopsin and saporin (SAP, n=10). Reproductive behaviors were analyzed weekly in a test pen with adult hens and MSAP Drakes showed a significant (p<0.01) reduction in reproductive behaviors after week 2. After 5weeks, Drakes were euthanized and body weights were measured, and brains, pituitaries, and testes collected and stored for analyses. Mature MSAP-treated Drakes had significantly (p<0.001) reduced relative teste weights compared to SAP controls. qRT-PCR analyses of hypothalamus showed a significant reduction (p<0.001) in GnRH and melanopsin mRNA levels, but not opsin 5, vertebrate ancient opsin, or opsin 2 (rhodopsin). Immunocytochemical analyses showed a significant reduction (p<0.01) in tyrosine hydroxylase-immunoreactivity in the PMM. These data suggest that although blue light alone is not able to maintain testicular function, the blue-light sensitive melanopsin activity is critical to maintain gonadal function.
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expression of deep brain photoreceptors in the pekin drake a possible role in the maintenance of testicular function
Poultry Science, 2017Co-Authors: R Haas, E Alenciks, Simone Meddle, Gregory S FraleyAbstract:ABSTRACT Several putative deep brain photoreceptors (DBPs) have been identified, such as melanopsin, opsin 5, and vertebrate ancient opsin. The aim of this study was to elucidate the role of DBPs in gonadal regulation in the Pekin drake. As previously reported, we observed opsin-like immunoreactivity (-ir) in the lateral septum (LS), melanopsin-ir in the premammillary nucleus (PMM), and opsin 5-ir in the periventricular organ. To determine the sensitivity of the DBPs to specific wavelengths of light, Drakes were given an acute exposure to red, blue, or white light. Blue light stimulated an increase (P
Tural Khudiyev - One of the best experts on this subject based on the ideXlab platform.
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biomimicry of multifunctional nanostructures in the neck feathers of mallard anas platyrhynchos l Drakes
Scientific Reports, 2015Co-Authors: Tural Khudiyev, Tamer Dogan, Mehmet BayindirAbstract:Biomimicry of multifunctional nanostructures in the neck feathers of mallard ( Anas platyrhynchos L.) Drakes
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Biomimicry of multifunctional nanostructures in the neck feathers of mallard (Anas platyrhynchos L.) Drakes
Scientific Reports, 2014Co-Authors: Tural Khudiyev, Tamer Dogan, Mehmet BayindirAbstract:Biological systems serve as fundamental sources of inspiration for the development of artificially colored devices and their investigation provides a great number of photonic design opportunities. While several successful biomimetic designs have been detailed in the literature, conventional fabrication techniques nonetheless remain inferior to their natural counterparts in complexity, ease of production and material economy. Here, we investigate the iridescent neck feathers of Anas platyrhynchos Drakes, show that they feature an unusual arrangement of two-dimensional (2D) photonic crystals and further exhibit a superhydrophobic surface and mimic this multifunctional structure using a nanostructure composite fabricated by a recently developed top-down iterative size reduction method, which avoids the above-mentioned fabrication challenges, provides macroscale control and enhances hydrophobicity through the surface structure. Our 2D solid core photonic crystal fibres strongly resemble drake neck plumage in structure and fully polymeric material composition and can be produced in wide array of colors by minor alterations during the size reduction process.
H Potter - One of the best experts on this subject based on the ideXlab platform.
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low light intensity in pekin duck breeder barns has a greater impact on the fertility of Drakes than hens
Poultry Science, 2018Co-Authors: L. Porter, H Potter, E Alenciks, S M Fraley, A. Porter, Gregory S FraleyAbstract:The Pekin duck is an excellent model for the study of seasonal reproduction. To more completely understand the lighting requirements for maximal fertility in duck breeder houses, we housed adult (45 week old) Drakes and hens in the Hope College aviary as 5 Drakes and 25 hens. Light conditions in each floor pen were normalized based upon quantal energy and divided into the following categories: (1) to simulate summer, 14.5 h 65 lux with 9.5 h 1 lux; (2) to simulate winter, 8 h 65 lux with 16 h 1 lux; (3) winter augmented, 8 h 65 lux with 16 h at 15 lux. The experiment was repeated with rotation of light treatments among 3 pens until a final N = 6 was obtained. Daily, total number of eggs laid was tallied, and a daily average of eggs laid was calculated throughout the study. Weekly, eggs were weighed and the perivitilline membrane was assayed for the number of sperm holes as an indirect measure of drake fertility. As expected, winter conditions caused a reduction in the percent of eggs laid and a reduction in the number of fertilized eggs compared to the summer light conditions. The augmented winter light conditions prevented the loss in the percent eggs laid and fertilized eggs. Surprisingly, even after 4 wk of the study, the winter conditions did not cause a complete loss of fertility in the Pekin ducks. At the end of the study, no differences in the relative expression in brain deep brain photoreceptors or gonadotropin inhibitory hormone mRNAs were observed among any light treatment. Although a minimum (1 lux) of light can support some fertility, our findings suggest commercial Pekin duck barns may benefit from increasing the augmented light to 15 lux to maintain optimal fertility during winter months. Furthermore, our data suggest that Drakes may be more sensitive to environmental light conditions than hens.
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immunolesion of melanopsin neurons causes gonadal regression in pekin Drakes anas platyrhynchos domesticus
General and Comparative Endocrinology, 2018Co-Authors: H Potter, E Alenciks, K Frazier, A. Porter, Gregory S FraleyAbstract:Abstract Several light sensitive receptors have been described in the avian brain that are thought to regulate the reproductive axis independently from the eyes and pineal gland. Recently, our lab has described the presence of three of these photoneuroendocrine systems in the Pekin duck: opsin, opsin 5, & melanopsin. We set out to test the hypothesis that melanopsin receptive neurons are necessary to maintain seasonal reproductive status along with growth and development in the Pekin drake. To accomplish these goals we first investigated 50-week-old Pekin Drakes that were housed in the aviary at Hope College under long day length (18 h lights on) conditions in floor pens. To specifically lesion melanopsin-receptive neurons, 3 μl of an anti-melanopsin-saporin conjugate (MSAP, 100 ng/ul) was injected into the lateral ventricle (n = 10). Control Drakes were injected with 3 μl of equimolar unconjugated anti-melanopsin and saporin (SAP, n = 10). Reproductive behaviors were analyzed weekly in a test pen with adult hens and MSAP Drakes showed a significant (p
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immunolesion of melanopsin neurons causes gonadal regression in pekin Drakes anas platyrhynchos domesticus
General and Comparative Endocrinology, 2018Co-Authors: H Potter, E Alenciks, K Frazier, A. Porter, Gregory S FraleyAbstract:Several light sensitive receptors have been described in the avian brain that are thought to regulate the reproductive axis independently from the eyes and pineal gland. Recently, our lab has described the presence of three of these photoneuroendocrine systems in the Pekin duck: opsin, opsin 5, & melanopsin. We set out to test the hypothesis that melanopsin receptive neurons are necessary to maintain seasonal reproductive status along with growth and development in the Pekin drake. To accomplish these goals we first investigated 50-week-old Pekin Drakes that were housed in the aviary at Hope College under long day length (18h lights on) conditions in floor pens. To specifically lesion melanopsin-receptive neurons, 3μl of an anti-melanopsin-saporin conjugate (MSAP, 100ng/ul) was injected into the lateral ventricle (n=10). Control Drakes were injected with 3μl of equimolar unconjugated anti-melanopsin and saporin (SAP, n=10). Reproductive behaviors were analyzed weekly in a test pen with adult hens and MSAP Drakes showed a significant (p<0.01) reduction in reproductive behaviors after week 2. After 5weeks, Drakes were euthanized and body weights were measured, and brains, pituitaries, and testes collected and stored for analyses. Mature MSAP-treated Drakes had significantly (p<0.001) reduced relative teste weights compared to SAP controls. qRT-PCR analyses of hypothalamus showed a significant reduction (p<0.001) in GnRH and melanopsin mRNA levels, but not opsin 5, vertebrate ancient opsin, or opsin 2 (rhodopsin). Immunocytochemical analyses showed a significant reduction (p<0.01) in tyrosine hydroxylase-immunoreactivity in the PMM. These data suggest that although blue light alone is not able to maintain testicular function, the blue-light sensitive melanopsin activity is critical to maintain gonadal function.
Tamer Dogan - One of the best experts on this subject based on the ideXlab platform.
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biomimicry of multifunctional nanostructures in the neck feathers of mallard anas platyrhynchos l Drakes
Scientific Reports, 2015Co-Authors: Tural Khudiyev, Tamer Dogan, Mehmet BayindirAbstract:Biomimicry of multifunctional nanostructures in the neck feathers of mallard ( Anas platyrhynchos L.) Drakes
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Biomimicry of multifunctional nanostructures in the neck feathers of mallard (Anas platyrhynchos L.) Drakes
Scientific Reports, 2014Co-Authors: Tural Khudiyev, Tamer Dogan, Mehmet BayindirAbstract:Biological systems serve as fundamental sources of inspiration for the development of artificially colored devices and their investigation provides a great number of photonic design opportunities. While several successful biomimetic designs have been detailed in the literature, conventional fabrication techniques nonetheless remain inferior to their natural counterparts in complexity, ease of production and material economy. Here, we investigate the iridescent neck feathers of Anas platyrhynchos Drakes, show that they feature an unusual arrangement of two-dimensional (2D) photonic crystals and further exhibit a superhydrophobic surface and mimic this multifunctional structure using a nanostructure composite fabricated by a recently developed top-down iterative size reduction method, which avoids the above-mentioned fabrication challenges, provides macroscale control and enhances hydrophobicity through the surface structure. Our 2D solid core photonic crystal fibres strongly resemble drake neck plumage in structure and fully polymeric material composition and can be produced in wide array of colors by minor alterations during the size reduction process.
