Last edited by Fenrikinos

Monday, August 10, 2020 | History

2 edition of **Mathematical modelling of human skin as a membrane in tension.** found in the catalog.

Mathematical modelling of human skin as a membrane in tension.

Ding-fook Sun

- 359 Want to read
- 20 Currently reading

Published
**1988**
in Bradford
.

Written in English

**Edition Notes**

Ph.D. thesis. Typescript.

Series | Theses |

ID Numbers | |
---|---|

Open Library | OL13861638M |

A variety of mathematical models describing dermal absorption during various types of exposures are available (Roberts et al., ), and choosing an appropriate model structure can be difficult. Because skin is a membrane, membrane models of the skin appear more realistic (Scheuplein, ) but can be. et al. model [34], in terms of the ability to fit to data of arsenic retention and methylation in human hepato-cytes. This comparison aims to highlight the advantages of developing biologically relevant TK models based on data acquired from human cells. Further comparison of these two models in terms of their estimated parameter.

causes skin thinning, necrosis, sloughing, and trauma through excessive tissue tension and co mpromised vascularization (Lo Giudice and Gosain, ). While it is virtually impossible to measure tissue tension in the living skin in vivo, mathematical modeling provides a . Introduction to the Human Body 10thEdition Binder Ready Versionoffers a balanced introduction to the human body, especially developed to meet the needs of the one-semester AP course. It provides an effective blend of stunning art and clearly written text to illuminate the complexities of the human body. Class-tested pedagogy is woven into the narrative and illustrations to ensure that students.

Hemodynamics or haemodynamics are the dynamics of blood circulatory system is controlled by homeostatic mechanisms, just as hydraulic circuits are controlled by control haemodynamic response continuously monitors and adjusts to conditions in the body and its environment. Thus, haemodynamics explains the physical laws that govern the flow of blood in the blood vessels. Mathematical models and simulations. Using mathematical models, the mechanics of the membrane cortex structures has been simulated. Using a worm-like-chain model with surface and bending energy, the force-displancement relations for the spectrin network of RBCs have been described (Discher, Boal et al.,; Dubus and Fournier,).

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In developing the model of the human skin as an elastic membrane, it is necessary to know how much tension exists naturally on the human body. That there is tension can be easily demonstrated by cutting a square of skin out of the human body.

It will shrink to a shape whose dimensions are usually per cent less than the dimensions of the Cited by: By means of a mathematical modeling resting on the fluid dynamical aspects of the technique, we describe the hemodynamic enhancements with respects to the classical surgical method.

The burgeoning interest in membrane research reflects the central role played by membranes in physiological processes, together with the fact that most of the important membrane transport problems remain unsolved.

These unsolved problems are frequently based on complex molecular interactions which are poorly by: For these reasons, mathematical models became a focus of interest.

In fact, mathematical models are a non-invasive procedure capable to present different levels of complexity, allowing to couple human skin structure, distinct cell types, different growth factors, ECM composition and by: Human Skin as an Elastic Membrane, SIAM Review, 15, No.

1, (). A Mathematical Model of the Human Skin as a Thin Elastic Membrane, Biomechanics Symposium edited by Y. Fung and J. Brighton, American Society of Mechanical Engineers, (). Today, many models, based on the Fick's law, 60 were established to mimic and predict the transdermal drug delivery process (e.g.

to predict the flux of drugs through the skin, 44 to optimize the. The wrinkling criteria are based on the natural contraction of a membrane in simple tension. Both the natural contraction and the modified elastic potential are defined in closed form.

The model has been implemented in a finite element code and the numerical solution validated using study cases with analytical solution. In this project we present two mathematical models for the human tympanic mem-brane. The eardrum can be viewed as an example of the vibrating drum problem.

In the ﬂrst model, we treat the tympanic membrane as a rectangular region. In the second model the tympanic membrane is considered as a disk. Both models use a wave equations. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

Although there have been many studies on the application of functional particles to cells, the basic mechanism of penetration across a biological membrane is still poorly understood. Here we used a model membrane system to demonstrate that lateral membrane tension drives particle penetration across a lipid bilayer.

Membrane tension couples front and rear 2D model of lamellipodial motility •Disassembly sets a ‘clock’ that determines front-to-rear distance. •Membrane tension mechanically couples protrusion at the front and retraction at the rear.

Local force balance between actin network and membrane tension. skin permeation methodology was relatively robust, not all variables were con-trolled.

They attributed the observed variation to human variability in dermal absorp-tion and the skin source. In this chapter we discuss some of the more important aspects of in vitro skin penetration and permeation measurements, we point out some factors that could.

Methods: A mathematical model of the mechanical behaviour of a taught elastic membrane is used to obtain a set of parameters intrinsic to the skin, such as Young's modulus (E) and the initial stress (σ 0), which reflect the stiffness and the natural tension of the skin, respectively.

We also calculated an index of non‐elasticity of the skin. There are many studies on certain skin cell specifications and their contribution to wound healing.

In this review, we provide an overview of dermal cell heterogeneity and their participation in skin repair, scar formation, and in the composition of skin substitutes. The papillary, reticular, and hair follicle associated fibroblasts differ not only topographically, but also functionally.

Human. A brief review of the current status of mathematical cochlear models will clarify the scope of the model proposed here. For a theoretician studying cochlear mechanics, the most important observations of von Bekesy [2] are listed below: (a) The basilar membrane has neither longitudinal nor transverse tension in the resting state (see also [3]).

Epidermal equivalents prepared with passaged keratinocytes are typically 10–20 μm thick, whereas intact human epidermis is up to μm thick. Our established mathematical model of.

predictive mathematical model describing the relationship between an in vitro property of an oral dosage form (usually rate or extent of drug dissolution or release) & a relevant in vivo response (ex. plasma drug concentration or amount of drug absorbed) To reduce surface tension of stomach fluid, human or animal skin or other membranes.

In this paper, a model of nociceptor transduction in skin thermal pain is developed in order to build direct relationship between stimuli and neural response, which incorporates a skin thermomechanical model for the calculation of temperature, damage and thermal stress at the location of nociceptor and a revised Hodgkin–Huxley form model for.

is a path for water and ions in plant roots through cell walls and aqueous spaces external to plasma membranes of cells. (as opposed to a mathematical model) means that the population may. fluctuate about carrying capacity. Engineering of human dominated environments so that they also serve as habitat for wild species; Subjects.

These microscopic structures can form a sheet that envelopes the outside of a biological cell in much the same way that human skin serves as the body's barrier to the outside environment.

Skin membrane can be examined at various levels of complexity. In mathematical treatments of temperature distribution in dermal layers, the membrane can be regarded as a physical and physiological barrier with complex structure.

Schematic diagram of temperature distribution model in the layers of dermal parts of human body is as shown in Figure 2.To create the mathematical model, consider what each of those terms will look like. Note that cell density is nand the chemical concentration is c. The rst term of (1) which models the cell migration is modeled by Dr2n.

Dis a di usion constant and r2 is the Laplacian operator commonly used to model di usion and cell migration. Hybrid cellular automata model. We consider three key cell types, melanocytes, keratinocytes, and fibroblasts.

These cells are defined as points on a two-dimensional grid that represents a cross-section (6 mm × mm, × 62 cells, cell diameter: 20μm) of human skin (Figure 1 – 2).Each grid point may be occupied by up to five microenvironmental variables, epidermal growth .