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Chen YJ, Fang CY, Huang YW, Hsu TF, Tang NT, Tsai HP, Lee RH, Lin SH, Hsuen HW, Lin KYA, Yang H. White Roman Goose Feather-Inspired Unidirectionally Inclined Conical Structure Arrays for Switchable Anisotropic Self-Cleaning. ACS APPLIED MATERIALS & INTERFACES 2024; 16:36840-36850. [PMID: 38954505 DOI: 10.1021/acsami.4c09082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
Abstract
White Roman goose (Anser anser domesticus) feathers, comprised of oriented conical barbules, are coated with gland-secreted preening oils to maintain a long-term nonwetting performance for surface swimming. The geese are accustomed to combing their plumages with flat bills in case they are contaminated with oleophilic substances, during which the amphiphilic saliva spread over the barbules greatly impairs their surface hydrophobicities and allows the trapped contaminants to be anisotropically self-cleaned by water flows. Particularly, the superhydrophobic behaviors of the goose feathers are recovered as well. Bioinspired by the switchable anisotropic self-cleaning functionality of white Roman geese, superhydrophobic unidirectionally inclined conical structures are engineered through the integration of a scalable colloidal self-assembly technology and a colloidal lithographic approach. The dependence of directional sliding properties on the shape, inclination angle, and size of conical structures is systematically investigated in this research. Moreover, their switchable anisotropic self-cleaning functionalities are demonstrated by Sudan blue II/water (0.01%) separation performances. The white Roman goose feather-inspired coatings undoubtedly offer a new concept for developing innovative applications that require directional transportation and the collection of liquids.
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Affiliation(s)
- You-Jie Chen
- Department of Chemical Engineering, National Chung Hsing University, Taichung 40227, Taiwan
| | - Cai-Yin Fang
- Department of Chemical Engineering, National Chung Hsing University, Taichung 40227, Taiwan
| | - Yun-Wen Huang
- Department of Chemical Engineering, National Chung Hsing University, Taichung 40227, Taiwan
| | - Ting-Fang Hsu
- Department of Chemical Engineering, National Chung Hsing University, Taichung 40227, Taiwan
| | - Nien-Ting Tang
- Department of Chemical Engineering, National Chung Hsing University, Taichung 40227, Taiwan
| | - Hui-Ping Tsai
- Department of Civil Engineering, National Chung Hsing University, 145 Xingda Road, Taichung 40227, Taiwan
| | - Rong-Ho Lee
- Department of Chemical Engineering, National Chung Hsing University, Taichung 40227, Taiwan
| | - Shin-Hua Lin
- Department of Chemical Engineering, National Chung Hsing University, Taichung 40227, Taiwan
| | - Hsiang-Wen Hsuen
- Department of Chemical Engineering, National Chung Hsing University, Taichung 40227, Taiwan
| | - Kun-Yi Andrew Lin
- Department of Environmental Engineering, National Chung Hsing University, Taichung 40227, Taiwan
- Institute of Analytical and Environmental Sciences, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - Hongta Yang
- Department of Chemical Engineering, National Chung Hsing University, Taichung 40227, Taiwan
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Bartels T, Berk J, Cramer K, Kanitz E, Otten W. Research Note: It's not just stress-fecal contamination of plumage may affect feather corticosterone concentration. Poult Sci 2021; 100:101494. [PMID: 34695634 PMCID: PMC8554247 DOI: 10.1016/j.psj.2021.101494] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 08/31/2021] [Accepted: 09/09/2021] [Indexed: 11/19/2022] Open
Abstract
The feather corticosterone concentration (fCORT) is increasingly used to assess long-term stress in birds as this indicator provides the potential to retrospectively evaluate the adrenocortical activity of a bird during the growth period of a feather over several weeks in one sample. However, there is still a lack of knowledge concerning external factors which can potentially influence fCORT in birds. The aim of the present study was to determine whether fCORT in laying hens is affected by previous fecal contamination of the plumage. Fully grown primaries 5 (P5s) of laying hens (n = 40) were used for the study. To test the effects of fecal contamination on fCORT, freshly defecated droppings from laying hens were collected and mixed manually. In order to simulate practical and at the same time standardized contamination, the upper surface of the previously determined middle third of the right P5 of each hen then was evenly coated with the paste prepared from fresh feces. The treated feathers were stored for 24 h protected from light at room temperature under a film cover to prevent evaporation. Thereafter, the applied layer of excreta was removed manually. Contralateral P5s of the same individuals were stored under identical conditions and served as controls. Both treatment and control feathers were washed in an aqueous soap solution, rinsed several times in pure water and air-dried subsequently. After pulverization and methanolic extraction, fCORT was analyzed by ELISA. The mean fCORT of treatment P5s (reference ‘feather length’: 12.88 ± 3.16 pg/mm; reference ‘feather weight’: 7.81 pg/mg ± 1.86 pg/mg) were significantly higher (P < 0.001) than those of control P5s (reference ‘feather length’: 9.76 ± 2.42 pg/mm; reference ‘feather weight’: 5.93 ± 1.44 pg/mg). Our results show that previous contamination with excreta can increase fCORT, which was detectable even after a washing procedure prior to analysis. In conclusion, fecal contamination of feathers is a significant influencing factor that has to be considered when applying fCORT measurements.
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Affiliation(s)
- T Bartels
- Friedrich-Loeffler-Institut, Institute for Animal Welfare and Animal Husbandry, Celle, Germany.
| | - J Berk
- Friedrich-Loeffler-Institut, Institute for Animal Welfare and Animal Husbandry, Celle, Germany
| | - K Cramer
- University of Leipzig, Clinic for Birds and Reptiles, Leipzig, Germany
| | - E Kanitz
- Research Institute for Farm Animal Biology (FBN), Institute of Behavioural Physiology, Dummerstorf, Germany
| | - W Otten
- Research Institute for Farm Animal Biology (FBN), Institute of Behavioural Physiology, Dummerstorf, Germany
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Deniz I, Demir T, Oncel SS, Hames EE, Vardar-Sukan F. Effect of Agitation and Aeration on Keratinase Production in Bioreactors Using Bioprocess Engineering Aspects. Protein J 2021; 40:388-395. [PMID: 33754250 DOI: 10.1007/s10930-021-09978-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/13/2021] [Indexed: 12/19/2022]
Abstract
Streptomyces sp. 2M21 was evaluated for keratinase production in bioreactors using chicken feathers. Firstly, optimization of bioengineering parameters (agitation and aeration rates) using Response Surface Methodology was carried out in 2 L bioreactors. Optimized conditions identified by the modified quadratic model were verified as 150 rpm and 1 vvm experimentally corresponding to 351 U/ml of keratinase activity. Moreover, scaling up sequentially to 20 L bioreactors was implemented using constant impeller tip speed and constant mass transfer coefficient as key scale-up parameters. The keratinase activity in 5, 10 and 20 L bioreactors showed similar results with the one of shake flasks (412 U/ml) and 2 L bioreactors (351 U/ml)with respect to the keratinase activity values of 336, 385 and 344 U/ml, respectively. The results suggest keratinase production by evaluating chicken feathers in commercial level. Furthermore, this study has potential to contribute industrial scale production of keratinase by Streptomyces sp. 2M21 using the proposed bioreactor conditions.
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Affiliation(s)
- Irem Deniz
- Bioengineering Department, Faculty of Engineering, Manisa Celal Bayar University, 45140, Muradiye-Manisa, Turkey.
| | - Tugce Demir
- Department of Bioengineering, Graduate School of Natural and Applied Sciences, Ege University, 35100, Bornova-Izmir, Turkey
| | - Suphi S Oncel
- Bioengineering Department, Faculty of Engineering, Ege University, 35100, Bornova-Izmir, Turkey
| | - E Esin Hames
- Bioengineering Department, Faculty of Engineering, Ege University, 35100, Bornova-Izmir, Turkey
| | - Fazilet Vardar-Sukan
- SUNUM Nanotechnology Research and Application Center, Sabancı University, 34956, Tuzla-Istanbul, Turkey
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