Experimental justification for prompt neutralization of traumatic action of thermal exo- and endogenous damage factors (morphological features)

Objective: morphological substantiation of efficiency of prompt neutralization of traumatic action of exogenous and endogenous damage factors in burn injuries in experimental conditions. After simulating the burns on 60 rats, the traumatic hyperthermic damage factors in the main group were immediately neutralized by a gauze napkin soaked in water. Depending on its duration, the animals were divided into subgroups. Such applications were not performed on the control group. The study involved histological examination of tissues. Animals of the main groups had the presence of histologically confirmed skin appendages with a formed scar of connective tissue without signs of inflammation. In animals of the control group there were no skin appendages, which indicates a deeper thermal damage to tissues and the impossibility of self-epithelialization of wounds. These results confirm the importance and necessity of prompt neutralization of the traumatic effect of damage factors as the main elements of burn depth formation.

COSMETOLOGICAL ANATOMICAL PATTERNS OF ROSACEA (DEMONSTRATION MATERIALS OF STUDENTS-SCIENTISTS)

The subject of research – anatomical patterns of rosacea. The aim of the work is to analyze the involvement of structural and functional units of the female body in the formation of cosmetic anatomical patterns of rosacea on the basis of demonstration materials selected by students in distance learning. Local tides in women with heat and redness of the facial skin in rosacea are closely associated with a violation of the functional state of innervation in this area of blood vessels, skin appendages, as well as central disorders of sensory perception.Key words: rosacea-tides, facial innervation, thalamus.

Histopathological Study of Epithelial, Melanocytic And Adnexal Tumors Of Skin- A Retrospective Study In A Tertiary Care Centre

Background and objectives: To classify and identify various skin tumors and study their variations according to age and sex. The most common predisposing factors being fair skin, sun exposure, chemical exposure, HPV infection in the setting of immunosuppression. Methods: This was an observational study carried out in the Department of Pathology at private Medical College of coastal Andhra from July 2018 to June 2020. Result: The present study included histopathological study of 71 cases of tumors of skin and its adnexae over a period of two years. Out of the 71 tumors, 43 were diagnosed as benign and 28 as malignant tumors of skin constituting 61% and 39% respectively. The ratio of benign to malignant tumors was 1:0.63. Among the 43 benign tumors 20 (46.5%) were tumors of skin appendages, 15 (34.9%) were tumors of epidermis, 8 (18.6%) were of melanocytic origin. Among the 28 malignant tumors 25 (89.3%) were tumors of epidermis, 2 (7.1%) were melanocytic tumors and 1 (3.6%) was tumor of skin appendages. Among the malignant epidermal tumors squamous cell carcinoma was the most common constituting 42.9% (12 cases). Conclusion: The present study concludes that benign tumors are most common when compared to malignant tumors of skin. Among the malignant tumors, Squamous cell carcinoma falls as the most common variety of skin followed by Basal cell carcinoma and verrucous carcinoma. Among the benign tumors, tumors of epidermal origin are most frequent followed by tumors of sweat gland and adnexal-hair follicle origin.

Pattern of skin diseases among patients attending Hawassa university comprehensive specialized hospital, Hawassa, Ethiopia

<p><strong>Background</strong>: Spectrum of skin diseases varies from region to region due to several factors such as genetics, socioeconomic and environmental. This study aimed to determine the pattern of various skin disorders appearing in the dermatology department of a tertiary care hospital.</p><p><strong>Methods</strong>: All patients attending the dermatology clinic of the Hawassa university comprehensive specialized hospital, from January 2017 to December 2018 were included in this retrospective analysis. The medical records of the patients were obtained from registry books. </p><p><strong>Results: </strong>A total of 7727 patients attended the dermatology clinic of HUCSH. Out of these samples, 18.1% of patients repeatedly came to the hospital for a follow up visit related to their diseases, while 81.9% were enrolled as new cases.</p><p>There were more males (51.9%) than females. More than three quarter of the cases were aged above 16 years while less than a quarter were children below 16 years. Eczema was diagnose in 2734 (35.4%), being the most common cause for attendance, followed by infectious disease (23.3%) and disease of the skin appendages (12.1%).</p><p class="abstract"><strong>Conclusions</strong>: Eczema was the most common skin disease seen in our study, followed by infectious disease and disease of the skin appendages. Concerted effort need to be made to control these conditions and training of the primary health care providers and education of General Practitioners in Dermatology must emphasize these common conditions, with the aim of improving primary health care and alleviating the burden of hospital care.</p>

Neoptile feathers contribute to outline concealment of precocial chicks

Camouflage is a widespread strategy to increase survival. The cryptic plumage colouration of precocial chicks improves camouflage often through disruptive colouration. Here, we examine whether and how fringed neoptile feathers conceal the outline of chicks. We first conducted a digital experiment to test two potential mechanisms for outline concealment through appendages: (1) reduction of edge intensity and (2) luminance transition. Local Edge Intensity Analysis showed that appendages decreased edge intensity whereas a mean luminance comparison revealed that the appendages created an intermediate transition zone to conceal the object’s outline. For edge intensity, the outline diffusion was strongest for a vision system with low spatial acuity, which is characteristic of many mammalian chick predators. We then analysed photographs of young snowy plover (Charadrius nivosus) chicks to examine whether feathers increase outline concealment in a natural setting. Consistent with better camouflage, the outline of digitally cropped chicks with protruding feathers showed lower edge intensities than the outline of chicks without those feathers. However, the observed mean luminance changes did not indicate better concealment. Taken together, our results suggest that thin skin appendages such as neoptile feathers improve camouflage. As skin appendages are widespread, this mechanism may apply to many organisms.

3D bioprinting for skin tissue engineering: Current status and perspectives

Skin and skin appendages are vulnerable to injury, requiring rapidly reliable regeneration methods. In recent years, 3D bioprinting has shown potential for wound repair and regeneration. 3D bioprinting can be customized for skin shape with cells and other materials distributed precisely, achieving rapid and reliable production of bionic skin substitutes, therefore, meeting clinical and industrial requirements. Additionally, it has excellent performance with high resolution, flexibility, reproducibility, and high throughput, showing great potential for the fabrication of tissue-engineered skin. This review introduces the common techniques of 3D bioprinting and their application in skin tissue engineering, focusing on the latest research progress in skin appendages (hair follicles and sweat glands) and vascularization, and summarizes current challenges and future development of 3D skin printing.