نتایج جستجو برای: silk suture

تعداد نتایج: 21085  

Journal: :Microbial Cell Factories 2004
Thomas Scheibel

Since thousands of years humans have utilized insect silks for their own benefit and comfort. The most famous example is the use of reeled silkworm silk from Bombyx mori to produce textiles. In contrast, despite the more promising properties of their silk, spiders have not been domesticated for large-scale or even industrial applications, since farming the spiders is not commercially viable due...

Journal: :Nature materials 2003
Nathan Becker Emin Oroudjev Stephanie Mutz Jason P Cleveland Paul K Hansma Cheryl Y Hayashi Dmitrii E Makarov Helen G Hansma

Spider capture silk is a natural material that outperforms almost any synthetic material in its combination of strength and elasticity. The structure of this remarkable material is still largely unknown, because spider-silk proteins have not been crystallized. Capture silk is the sticky spiral in the webs of orb-weaving spiders. Here we are investigating specifically the capture spiral threads ...

Hamidimanesh, Taqi , Ja’fari Dehkordi , Nāhid ,

The Safavid kings had a fairly influential role in Iran’s cultural, economic and social prosperity after a long era of turmoil and recession. The art of weaving silk fabrics is one of the examples that grew up in light of the attention and support of the Safavid officials. During the Achaemenid era, Iranians were aware of the mystery of silkworm and silk threads that came from China to Iran. Su...

Emerging line research showed that silk nanoparticles (NPs) have toxicity on the fibroblastand Huvec cells without any toxicity recognized mechanisms. Recently, it suggested peripheralarterial disease confounds almost eight million Americans. Also, due to the main effect offibroblast in a production of extracellular matrix (ECM), adhesive molecules, glycoproteinsand various cytokines, it decide...

Journal: :The Journal of experimental biology 2010
Cecilia Boutry Todd Alan Blackledge

Spider silk is a promising biomaterial with impressive performance. However, some spider silks also 'supercontract' when exposed to water, shrinking by up to ∼50% in length. Supercontraction may provide a critical mechanism to tailor silk properties, both for future synthetic silk production and by the spiders themselves. Several hypotheses are proposed for the mechanism and function of superco...

2016
Anna Tarakanova

Among a myriad of spider web geometries, the orb web presents a fascinating, exquisite example in architecture and evolution. Its structural component, the silk protein, is an exemplary natural material because its superior properties stem intrinsically from the synergistic cooperativity of hierarchically-organized components, rather than from the particular properties of the building blocks th...

Journal: :Nature chemical biology 2015
Anna Rising Jan Johansson

Spider silk is strong and extensible but still biodegradable and well tolerated when implanted, making it the ultimate biomaterial. Shortcomings that arise in replicating spider silk are due to the use of recombinant spider silk proteins (spidroins) that lack native domains, the use of denaturing conditions under purification and spinning and the fact that the understanding of how spiders contr...

Journal: :Nature communications 2012
Vasav Sahni Jared Harris Todd A Blackledge Ali Dhinojwala

Spiders' cobwebs ensnare both walking and flying prey. While the scaffolding silk can entangle flying insects, gumfoot silk threads pull walking prey off the ground and into the web. Therefore, scaffolding silk needs to withstand the impact of the prey, whereas gumfoot silk needs to easily detach from the substrate when contacted by prey. Here we show that spiders accomplish these divergent dem...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2009
Todd A Blackledge Nikolaj Scharff Jonathan A Coddington Tamas Szüts John W Wenzel Cheryl Y Hayashi Ingi Agnarsson

The evolutionary diversification of spiders is attributed to spectacular innovations in silk. Spiders are unique in synthesizing many different kinds of silk, and using silk for a variety of ecological functions throughout their lives, particularly to make prey-catching webs. Here, we construct a broad higher-level phylogeny of spiders combining molecular data with traditional morphological and...

Journal: :acta medica iranica 0
m. akhlaghi b. valizadeh j. gharedaghi

the identity of dead is an essential part of post-mortem examination. the identification of unknown human remnants begins with the creation of an anthropological profile, which includes sex, biological age, stature and individualizing features. the estimation of age at death is based on the bodily biological changes that occur throughout life. closure of spheno occipital synchondrosis is one of...

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