scholarly journals Nanostructural Organization of Naturally Occurring Composites—Part II: Silica-Chitin-Based Biocomposites

2008 ◽  
Vol 2008 ◽  
pp. 1-8 ◽  
Author(s):  
Hermann Ehrlich ◽  
Dorte Janussen ◽  
Paul Simon ◽  
Vasily V. Bazhenov ◽  
Nikolay P. Shapkin ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Physicochemical Properties ◽  
Detailed Analysis ◽  
Alkali Treatment ◽  
Structural Similarity ◽  
Practical Application ◽  
Glass Sponge ◽  
Naturally Occurring ◽  
Glass Sponges ◽  
Nanostructural Organization

Investigations of the micro- and nanostructures and chemical composition of the sponge skeletons as examples for natural structural biocomposites are of fundamental scientific relevance. Recently, we show that some demosponges (Verongula gigantea, Aplysinasp.) and glass sponges (Farrea occa, Euplectella aspergillum) possess chitin as a component of their skeletons. The main practical approach we used for chitin isolation was based on alkali treatment of corresponding external layers of spicules sponge material with the aim of obtaining alkali-resistant compounds for detailed analysis. Here, we present a detailed study of the structural and physicochemical properties of spicules of the glass spongeRossella fibulata. The structural similarity of chitin derived from this sponge to invertebrate alpha chitin has been confirmed by us unambiguously using physicochemical and biochemical methods. This is the first report of a silica-chitin composite biomaterial found inRossella species. Finally, the present work includes a discussion related to strategies for the practical application of silica-chitin-based composites as biomaterials.

scholarly journals Nanostructural Organization of Naturally Occurring Composites—Part I: Silica-Collagen-Based Biocomposites

2008 ◽  
Vol 2008 ◽  
pp. 1-8 ◽  
Author(s):  
Hermann Ehrlich ◽  
Sascha Heinemann ◽  
Christiane Heinemann ◽  
Paul Simon ◽  
Vasily V. Bazhenov ◽  
...  
Keyword(s):  
Structural Similarity ◽  
Biochemical Properties ◽  
Fibrillar Collagen ◽  
Biomimetic Materials ◽  
Glass Sponge ◽  
Practical Applications ◽  
Naturally Occurring ◽  
Glass Sponges ◽  
Biochemical Compositions ◽  
Nanostructural Organization

Glass sponges, as examples of natural biocomposites, inspire investigations aiming at both a better understanding of biomineralization mechanisms and novel developments in the synthesis of nanostructured biomimetic materials. Different representatives of marine glass sponges of the class Hexactinellida (Porifera) are remarkable because of their highly flexible basal anchoring spicules. Therefore, investigations of the biochemical compositions and the micro- and nanostructure of the spicules as examples of naturally structured biomaterials are of fundamental scientific relevance. Here we present a detailed study of the structural and biochemical properties of the basal spicules of the marine glass spongeMonorhaphis chuni. The results show unambiguously that in this glass sponge a fibrillar protein of collagenous nature is the template for the silica mineralization in all silica-containing structural layers of the spicule. The structural similarity and homology of collagens derived fromM. chunispicules to other sponge and vertebrate collagens have been confirmed by us using FTIR, amino acid analysis and mass spectrometric sequencing techniques. We suggest that nanomorphology of silica formed on proteinous structures could be determined as an example of biodirected epitaxial nanodistribution of amorphous silica phase on oriented fibrillar collagen templates. Finally, the present work includes a discussion relating to silica-collagen-based hybrid materials for practical applications as biomaterials.

Biological and Synthetic Self-Cleaning Surfaces

MRS Bulletin ◽  
2008 ◽  
Vol 33 (8) ◽  
pp. 742-746 ◽  
Author(s):  
Jan Genzer ◽  
Abraham Marmur
Keyword(s):  
Chemical Composition ◽  
Physicochemical Properties ◽  
Case Studies ◽  
Surface Chemical ◽  
Surface Chemical Composition ◽  
Naturally Occurring ◽  
Self Cleaning ◽  
Special Case

AbstractIn this contribution, we briefly discuss how various physicochemical properties of surfaces affect the wettability and self-cleaning character of both naturally occurring and synthetic surfaces. Using a few selected examples from nature, we discuss the superhydrophobic effect and antifouling character of such surfaces and how these properties are associated with variations in surface chemical composition and topography. We also review a few special case studies aimed at adopting these biomimetic schemes to design and fabricate functional self-cleaning surfaces.

Referring to past actions in caregiver–child interaction in Japanese

2019 ◽  
Vol 3 (1-2) ◽  
pp. 92-118 ◽  
Author(s):  
Tomoyo Takagi
Keyword(s):  
Young Child ◽  
Detailed Analysis ◽  
Major Part ◽  
Analytic Approach ◽  
Naturally Occurring ◽  
Child Interaction ◽  
Past Experiences

In naturally occurring everyday caregiver–child interaction, a major part of what is hearable as storytelling or an incipient form of it is talk about participants’ (mostly children’s) past experiences. Adopting a conversation-analytic approach, this study attempts to show how explicit references to children’s past actions formulated in the form of [(X) did (Y)], where X is the young child interacting with the caregiver, can engender opportunities for participants to develop telling activities. Through the detailed analysis of talk and embodied features of telling sequences in each case, the analysis will reveal how the [(X) did (Y)]-format utterance is utilized for co-constructing the telling, and what social and interactional consequences are accomplished through the telling occasioned by such reference.

scholarly journals Changes of Physicochemical Properties of Starch Syrups Recommended for Winter Feeding of Honeybees during Storage

Agriculture ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 374
Author(s):  
Teresa Szczęsna ◽  
Ewa Waś ◽  
Piotr Semkiw ◽  
Piotr Skubida ◽  
Katarzyna Jaśkiewicz ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Physicochemical Properties ◽  
Physicochemical Parameters ◽  
Storage Temperature ◽  
Storage Conditions ◽  
Different Temperatures ◽  
And Storage ◽  
Bee Colonies ◽  
Temperature Time ◽  
Winter Feeding

The aim of this study was to determine the influence of storage temperature and time on physicochemical parameters of starch syrups recommended for the winter feeding of bee colonies. The studies included commercially available three starch syrups and an inverted saccharose syrup that were stored at different temperatures: ca. 20 °C, 10–14 °C, and ca. 4 °C. Physicochemical parameters of fresh syrups (immediately after purchase) and syrups after 3, 6, 9, 12, 15, 18, 21, and 24 months of storage at the abovementioned temperatures were measured. It was observed that the rate of unfavorable changes in chemical composition of starch syrups and the inverted saccharose syrup, mainly the changes in the 5-hydroxymethylfurfural (HMF) content, depended on the type of a syrup and storage conditions (temperature, time). Properties of tested starch syrups intended for winter feeding of bees stored at ca. 20 °C maintained unchanged for up to 6 months, whereas the same syrups stored at lower temperatures (10–14 °C) maintained unchanged physicochemical parameters for about 12 months. In higher temperatures, the HMF content increased. To date, the influence of this compound on bees has not been thoroughly investigated.

scholarly journals Non-invasive sensing for food reassurance

The Analyst ◽  
2016 ◽  
Vol 141 (5) ◽  
pp. 1587-1610 ◽  
Author(s):  
Zou Xiaobo ◽  
Huang Xiaowei ◽  
Malcolm Povey
Keyword(s):  
Chemical Composition ◽  
Physicochemical Properties ◽  
Food Quality ◽  
Physical Principle ◽  
Quality Traits ◽  
X Ray ◽  
Main Food ◽  
Non Invasive ◽  
Wide Range ◽  
Nutritional Characteristics

The main food quality traits of interest using non-invasive sensing techniques are sensory characteristics, chemical composition, physicochemical properties, health-protecting properties, nutritional characteristics and safety. A wide range of non-invasive sensing techniques, from optical, acoustical, electrical, to nuclear magnetic, X-ray, biosensor, microwave and terahertz, are organized according to physical principle.

Sb-V-Ox catalysts—Role of chemical composition of MCM-41 supports in physicochemical properties

2009 ◽  
Vol 142 (3-4) ◽  
pp. 175-180 ◽  
Author(s):  
H. Golinska ◽  
P. Decyk ◽  
M. Ziolek ◽  
J. Kujawa ◽  
E. Filipek
Keyword(s):  
Chemical Composition ◽  
Physicochemical Properties ◽  
Mcm 41
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