Hierarchical growth of nickel oxyhydroxide on bacterial cellulose hydrogel: role of water channels in hydrogel to form hierarchical structure

2020 ◽  
Vol 15 (2) ◽  
Author(s):  
Zahid Hanif ◽  
Mohd Farhan Siddiqui ◽  
Sung Jea Park
Keyword(s):  
Bacterial Cellulose ◽  
Hierarchical Structure ◽  
Water Channels ◽  
Cellulose Hydrogel ◽  
Nickel Oxyhydroxide

Water transport across mammalian cell membranes

1996 ◽  
Vol 270 (1) ◽  
pp. C12-C30 ◽  
Author(s):  
A. S. Verkman ◽  
A. N. van Hoek ◽  
T. Ma ◽  
A. Frigeri ◽  
W. R. Skach ◽  
...  
Keyword(s):  
Water Transport ◽  
Cell Membranes ◽  
Water Channel ◽  
Water Channels ◽  
Channel Structure ◽  
Level Information ◽  
Selective Channel ◽  
Transcriptional Units ◽  
Measurement Strategies

This review summarizes recent progress in water-transporting mechanisms across cell membranes. Modern biophysical concepts of water transport and new measurement strategies are evaluated. A family of water-transporting proteins (water channels, aquaporins) has been identified, consisting of small hydrophobic proteins expressed widely in epithelial and nonepithelial tissues. The functional properties, genetics, and cellular distributions of these proteins are summarized. The majority of molecular-level information about water-transporting mechanisms comes from studies on CHIP28, a 28-kDa glycoprotein that forms tetramers in membranes; each monomer contains six putative helical domains surrounding a central aqueous pathway and functions independently as a water-selective channel. Only mutations in the vasopressin-sensitive water channel have been shown to cause human disease (non-X-linked congenital nephrogenic diabetes insipidus); the physiological significance of other water channels remains unproven. One mercurial-insensitive water channel has been identified, which has the unique feature of multiple overlapping transcriptional units. Systems for expression of water channel proteins are described, including Xenopus oocytes, mammalian and insect cells, and bacteria. Further work should be directed at elucidation of the role of water channels in normal physiology and disease, molecular analysis of regulatory mechanisms, and water channel structure determination at atomic resolution.

The Expanding Role of Bacterial Cellulose in Addressing Environmental Challenges

2021 ◽  
pp. 145-175
Author(s):  
Ajmal Shahzad ◽  
Sehrish Manan ◽  
Jawad Ali ◽  
Mazhar Ul-Islam ◽  
Muhammad Wajid Ullah ◽  
...  
Keyword(s):  
Bacterial Cellulose ◽  
Environmental Challenges

scholarly journals Introduction of the distributed registry technology into the company’s management system

2018 ◽  
Vol 212 ◽  
pp. 09013
Author(s):  
Nikolay Mrochkovsky
Keyword(s):  
Transaction Costs ◽  
Hierarchical Structure ◽  
Management System ◽  
Smart Contracts ◽  
Organization And Management ◽  
Commercial Organization ◽  
P2p Technology

The technology of the distributed registry creates new opportunities for changing the management system, which are discussed in the article. The use of the blockchain allows building a decentralized autonomous commercial organization on a network basis. With the help of p2p technology, it is possible to radically reorganize the structure of organization and management, and reduce the management and transaction costs inherent in the traditional hierarchical structure of the firm. The analysis of the steps by means of which real enterprises can be transferred to the blockchain is provided, and the role of smart contracts is analyzed.

Mechanical modification of bacterial cellulose hydrogel under biaxial cyclic tension

2020 ◽  
Vol 142 ◽  
pp. 103272 ◽  
Author(s):  
Xing Gao ◽  
Emrah Sözümert ◽  
Zhijun Shi ◽  
Guang Yang ◽  
Vadim V. Silberschmidt
Keyword(s):  
Bacterial Cellulose ◽  
Cyclic Tension ◽  
Cellulose Hydrogel

Production with a High Yield of Bacterial Cellulose Nanocrystals by Enzymatic Hydrolysis

2019 ◽  
Vol 19 (03) ◽  
pp. 1950015
Author(s):  
Ricardo Brandes ◽  
Leticia de Souza ◽  
Claudimir Carminatti ◽  
Derce Recouvreux
Keyword(s):  
Enzymatic Hydrolysis ◽  
Bacterial Cellulose ◽  
Cellulose Nanocrystals ◽  
Primary Objective ◽  
High Yield ◽  
Low Density ◽  
Enzymatic Method ◽  
Citrate Buffer ◽  
Cellulose Hydrogel ◽  
Time Required

Bacterial cellulose nanocrystals are highly crystalline structures with nanoscopic scale dimensions that have received increased attention in the nanocomposites area. Its properties, such as large surface area, low density, mechanical strength and ease of modification, are attractive to the preparation many kinds of nanomaterials applied multifunctional in various fields. Besides, the cellulose nanocrystals are from abundant and renewable sources that are biodegradable. An altemative method is to obtain bacterial cellulose nanocrystal by enzymatic hydrolysis because it is, less expensive, it does not use chemicals and it requires much less energy. In this sense, the primary objective of this study was to produce bacterial cellulose using glycerol as a carbon source and isolate nanocrystals from bacterial cellulose using the enzymatic hydrolysis. This study also investigated the yield of nanocrystals depending on the weight of the bacterial cellulose hydrogel, keeping constant some enzymes. The study shows us that the enzymatic method has the best performance when using cellulose hydrogel 2[Formula: see text]g to 40[Formula: see text][Formula: see text]L cellulase enzyme (endoglucanase) and 1[Formula: see text]mL of citrate buffer. Also, it was observed that the yield of nanocrystals decrease with increasing time required for the hydrolysis.

scholarly journals Bayesian survival analysis of batsmen in Test cricket

2017 ◽  
Vol 13 (1) ◽  
Author(s):  
Oliver George Stevenson ◽  
Brendon J. Brewer
Keyword(s):  
Survival Analysis ◽  
New Zealand ◽  
Hierarchical Structure ◽  
Analysis Method ◽  
Selection Policy ◽  
Team Selection ◽  
The Hierarchical Structure ◽  
Two Stages ◽  
Practical Implications

AbstractCricketing knowledge tells us batting is more difficult early in a player’s innings but becomes easier as a player familiarizes themselves with the conditions. In this paper, we develop a Bayesian survival analysis method to predict the Test Match batting abilities for international cricketers. The model is applied in two stages, firstly to individual players, allowing us to quantify players’ initial and equilibrium batting abilities, and the rate of transition between the two. This is followed by implementing the model using a hierarchical structure, providing us with more general inference concerning a selected group of opening batsmen from New Zealand. The results indicate most players begin their innings playing with between only a quarter and half of their potential batting ability. Using the hierarchical structure we are able to make predictions for the batting abilities of the next opening batsman to debut for New Zealand. Additionally, we compare and identify players who excel in the role of opening the batting, which has practical implications in terms of batting order and team selection policy.

Protective role of aquaporin-4 water channels after contusion spinal cord injury

2010 ◽  
pp. NA-NA ◽  
Author(s):  
Atsushi Kimura ◽  
Mike Hsu ◽  
Marcus Seldin ◽  
Alan S. Verkman ◽  
Helen E. Scharfman ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Water Channels ◽  
Protective Role ◽  
Aquaporin 4 ◽  
Cord Injury
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