Search results: Found 5

Listing 1 - 5 of 5
Sort by
Plant Extracts in Skin Care Products

Authors: ---
ISBN: 9783038971603 9783038971610 Year: Pages: 144 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Biology
Added to DOAB on : 2018-09-10 11:33:13
License:

Loading...
Export citation

Choose an application

Abstract

Currently, in the cosmetic industry, there is an increasing interest in natural extracts, particularly plant extracts. The inclusion of antioxidants in topical formulations may contribute to minimize skin oxidative stress, which has been associated with aging. Many herbal agents used in cosmetics have been selected by a process of ‘trial and error’ and, thus, are used on the basis of experience rather than of experimental investigation. Nevertheless, there is now a growing scientific evidence that plants possess a vast and complex arsenal of active ingredients able not only to calm or smooth but also to actively restore, heal, and protect the human skin. In addition, plant extracts may contain compounds with antimicrobial or other beneficial properties, influencing the formulation of natural and non-chemical cosmetic products. The public trend towards natural and sustainable products is ongoing. Although the term “plant extract” inherently purports their beneficial and benign properties, these products could have adverse reactions in individuals. Therefore, it is essential to ensure quality and safety of these extracts in cosmetic products before embarking on the more arduous task of ensuring efficacy.

Modelling the human cardiac fluid mechanics. 2nd ed

Author:
ISBN: 3866440871 Year: Pages: 39 p. DOI: 10.5445/KSP/1000005151 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:58
License:

Loading...
Export citation

Choose an application

Abstract

In the second edition of the article a virtual heart modelsimulating the flow in the active left human ventricle andatrium is presented. Because in vivo myocardium data is notavailable, the movement of the active ventricle and its atriumis given by three-dimensional, time-dependent invivo image dataof a nuclear spin MRI tomograph. The passive part of the virtualheart model consists of a model aorta and of two-dimensionallymodelled heart valves. As the flow is actively driven by theventricle and atrium, a coupling off low and structure isnecessary to take into account the deviation of the aorta andthe closing and opening of the heart valves. This coupling isreplaced by the movement given by MRI tomograph and ultrasonicDoppler echocardiography, since we focus on the flow simulationin the left pumping ventricle. The flow simulation is performedby a validated commercial software package that uses the finitevolume method. The flow resistance of the circulation throughthe body is taken into account with a simplified circulationmodel. The article shows how the virtual heart model can be usedto predict flow losses and flow structures due to pathologicalventricle contraction defects. It provides as an example theflow simulation of an unhealthy human ventricle with ananeurysm. The flow structure and flow losses are consideredbefore and after surgery.

Modelling the human cardiac fluid mechanics

Author:
ISBN: 3937300821 Year: Pages: 49 p. DOI: 10.5445/KSP/1000003551 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:58
License:

Loading...
Export citation

Choose an application

Abstract

We present a virtual heart model simulating the flow in the left human ventricle and in the aorta. Because of the lack of in vivo structure data of the human ventricle, the active ventricle movement is given by a time-dependent ventricle model that is derived from in vivo image data of a nuclear spin MRT tomograph of a healthy human heart. The passive part of the virtual heart model consists of a model aorta and vena cava, and of heart valves. As the movement is due to the flow in the inactive region of the heart, a coupling of flow and structure is necessary in the model to take into account the deviation of the aorta and the closing and opening of the heart valves. The flow calculation is performed with a finite volume method, while the structure of the aorta is calculated using the finite element method. The flow resistance of the time simulation in the body is taken into account with a circulation model. In the outlook of the article, we show how the virtual heart model can be used to predict flow losses due to pathological ventricle contraction defects in an unhealthy human heart.

Numerical efficiency calibration of in vivo measurement systems : Monte Carlo simulations of in vivo measurement scenarios for the detection of incorporated radionuclides, including validation, analysis of efficiency-sensitive parameters and customized anthropomorphic voxel models

Author:
ISBN: 9783866445093 Year: Pages: X, 237 p. DOI: 10.5445/KSP/1000017470 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:01
License:

Loading...
Export citation

Choose an application

Abstract

Monte Carlo radiation transport codes were used with virtual models of in vivo measurement equipment. Software was coded to handle memory intensive anthropomorphic voxel models for simulation of measurement scenarios. Tools, methods and models have been validated. Various parameters have been investigated for their sensitivity. Methods based on image registration techniques have been developed to transform existing human models to match with an individual test person.

Impact of Bioactive Peptides on Human Health

Author:
ISBN: 9783038976202 / 9783038976219 Year: Pages: 212 DOI: 10.3390/books978-3-03897-621-9 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Chemical Technology --- Nutrition and Food Sciences
Added to DOAB on : 2019-02-19 09:06:48
License:

Loading...
Export citation

Choose an application

Abstract

Food-derived bioactive peptides or dietary peptides are increasingly becoming recognized as major food compounds for human health promotion, which prevent the occurrence of chronic diseases through their impacts on the gastrointestinal, cardiovascular, immune, and nervous systems. Further bioactive peptide discoveries are essential for maintaining human health and commercial development in the area of functional foods and nutraceuticals. This Special Issue covers a wide range of research topics specifically on food-derived bioactive proteins and peptides including the in-vitro and in-vivo evaluation of biological activities, bio-accessibility, intestinal absorption, bioavailability, the effect on chronic diseases, and the modulation of human nutrition.

Listing 1 - 5 of 5
Sort by
Narrow your search

Publisher

KIT Scientific Publishing (3)

MDPI - Multidisciplinary Digital Publishing Institute (2)


License

CC by-nc-nd (5)


Language

english (5)


Year
From To Submit

2019 (1)

2018 (1)

2010 (1)

2006 (1)

2005 (1)