The morphogenesis of feathers
WebJul 2, 2024 · The rachises of extant feathers, composed of dense cortex and spongy internal medulla, are flexible and light, yet stiff enough to withstand the load required for flight, among other functions.... WebExperimental work on feathers, starting from the beginning of the twentieth century, was summarized in a chapter on skin morphogenesis by Sengel ( 3 ). On the basis of these …
The morphogenesis of feathers
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WebJan 16, 2024 · The morphogenesis for the flight feather, the most advanced type of feather, has been drastically modified from the beginning of feather morphogenesis, suggesting … WebAbstract The rachises of extant feathers, composed of dense cortex and spongy internal medulla, are flexible and light, ... Coupled with findings on extant feather morphogenesis, known fossil RDFs were categorized into three morphotypes based on their rachidial configurations. For each morphotype, potential developmental scenarios were depicted ...
WebA paper describing this work, “The Morphogenesis of Feathers,” au-thored by principal investigator and pathology professor Cheng-Ming Chuong and … Chickens at 2–3 weeks of age were anaesthetized with ketamine (50 mg per kg body mass). Primary remiges I to VII were used because of their large size, distinct morphology and identity. Normally, feathers will regenerate and grow out of the follicles at about 14 days after plucking. Regenerated … See more Specific pathogen-free, fertilized white leghorn chicken eggs were purchased from Charles River SPAFAS. The eggs were incubated at 38 … See more Paraffin sections (5 µm) were stained with haematoxylin and eosin or prepared for in situ hybridization following routine procedures26. Cryostat sections (10 µm) were stained with X … See more
WebJan 6, 2005 · The first evidence of feather morphogenesis early in embryogenesis is a nonproliferating, radially symmetrical ectodermal placode and subsequently a subjacent nonproliferating dermal condensation (Wessells, 1965; Sawyer, 1970 ). WebSep 10, 2016 · Feathers are corneous microramifications of variable complexity derived from the morphogenesis of barb ridges. Histological and ultrastructural analyses on developing and regenerating feathers clarify the three-dimensional organization of …
WebThe stages are induction, morphogenesis, differentiation and cycling. In the early stages, the message is simply ‘to make an appendage’ and appendage phenotypes may be interconverted. Source...
WebThe morphogenesis of feathers Mingke Yu, Ping Wu, Randall Widelitz, Cheng-Ming Chuong 2002 Nature v420 p308-312 In this article from the journal Nature, the authors examine the gene pathways that lead to the development of different feather types. fhwa form 1273WebHere, we use a developmental approach to analyse molecular mechanisms in feather-branching morphogenesis. We have used the replication-competent avian sarcoma retrovirus to deliver exogenous genes to regenerating flight feather follicles of chickens. deped memorandum 33 s. 2022WebCoupled with findings on extant feather morphogenesis, known fossil RDFs were categorized into three morphotypes based on their rachidial configurations. For each morphotype, potential developmental scenarios were depicted by referring to the rachidial development in chickens, and relative stiffness of each morphotype was estimated … deped memorandum 101 s. 2022WebNov 29, 2012 · Hair, feathers, and scales: An evolutionary tale Editor's Introduction The anatomical placode in reptile scale morphogenesis indicates shared ancestry among skin appendages in amniotes annotated by Alicia Graham, Reyhaneh Sharif Sanavi, Hamidreza Esmaeili, Shelby Lake Do skin features like hair, feathers, and scales share a common … deped memorandum 004 s 2022 pdfWebFeather forming steps include the formation of follicle structure , cyclic regeneration of feather stem cells , and branching morphogenesis . Furthermore, comparative genomic studies showed that the number of α- and β-keratin genes and β-keratin gene diversity were important for feather evolution and the adaptation of birds to diverse ... deped memorandum 34 s 2022WebDec 14, 2005 · Three criteria were used to map stem and progenitor cell activities in the feather follicles during the growth and moulting phases: long-term label retention for slow-cycling cells 9, 10, grafting ... fhwa form 1273 latest versionWebstudies on developing and regenerating feathers have mainly described the process of keratinization (Matulionis 1970; Kemp et al. 1974; Bowers & Brunbaugh 1978). In order to fill the gap in the knowledge of the ultrastructural features of feather morphogenesis (Maderson & Alibardi 2000), the cell composition and differentiation of feathers have fhwa form 1391 fillable