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This is thick skin in Mallory stain🔬
We can see the enormous thickness of the stratum corneum and abundant stratum lucidum (red)
In blue we see the dermis of the skin, joined to the epidermis by interdermal ridges and papillae.
In white we have the hypodermis, an abundant mass of adipose tissue
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2324-El beso es el contacto de dos epidermis y la fusión de dos fantasías.
a little wip for a project thats --- due tomorrow? ehhhh it'll be fine
Other specialized epidermal cells, such as lithocysts, bulliform cells, silica cells, and cork cells (Figure 19.9), are found only in certain groups of plants and are not studied as well.
"Plant Physiology and Development" int'l 6e - Taiz, L., Zeiger, E., Møller, I.M., Murphy, A.
The majority of plant species (including most ferns and dicots, as well as many monocots) exhibit Type I root hair development, in which every root epidermal cell can potentially differentiate into a root hair (Figure 18.35A). (...) In Type II plants, which include the primitive vascular plants Lycopodium, Selaginella and Equisetum, the basal angiosperm family Nymphaeceae (water lilies), and some monocots, root hairs arise from the smaller cell produced by an asymmetric cell division in the root meristem (Figure 18.35B). (...) In Arabidopsis, for example, the root epidermis consists of alternating files of cells that are either atrichoblasts or trichoblasts (Figure 18.35C). (...) Each root hair cells has a long, fingerlike extension that usually grows from the basal end of the epidermal cell (see Figure 18.35).
"Plant Physiology and Development" int'l 6e - Taiz, L., Zeiger, E., Møller, I.M., Murphy, A.
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Randomly Selected Botanical Terms: Prickles
Randomly Selected Botanical Terms: Prickles
Let’s start by getting something out of the way: roses have prickles, not thorns. However, just like peanuts aren’t actually nuts and tomatoes are actually fruits, our colloquial terms for things don’t always match up with botanical terminology. This doesn’t mean that we should be pedants about things and go spoiling a friendly dinner party with our “well, actually…” corrections. If you hear…
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Officially a licensed aesthetician!
Just entered week two of laser class. 😊
Patchy Signal
A skin condition characterised by scaly red patches, psoriasis is an autoimmune disorder linked to dysfunctional immune signalling, causing inflammation and accelerating cell division in the outermost layer of skin, the epidermis. Treatments targeting a shared feature of signalling proteins interleukin-12 (IL-12) and interleukin-23 (IL-23) can alleviate symptoms, but later drugs affecting only IL-23 proved even more effective, prompting questions about the role of IL-12. By selectively deleting the receptor for IL-12 in epidermal skin cells, keratinocytes, in mice, researchers showed that IL-12 actually protects against psoriasis. In the skin samples above, dividing keratinocytes in the epidermis (left of the white line), are highlighted in red; cells possessing the IL-12 receptor (left panel) are dividing less than those lacking it (right), suggesting that IL-12 acts to reduce cell proliferation. Future therapies should therefore concentrate on IL-23, a result with potential implications for other conditions treated by blocking both proteins.
Written by Emmanuelle Briolat
Image from work by Pascale Zwicky and colleagues, University of Zurich
Institute of Experimental Immunology, University of Zurich, Zurich, Switzerland
Image copyright held by the original authors
Research published in Science Immunology, October 2021
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