scholarly journals Toward controlled geometric structure and surface property heterogeneities of TiO2 for lipase immobilization

2021 ◽  
Author(s):  
Wenfeng Zhou ◽  
Xiaohong Zhou ◽  
Wei Zhuang ◽  
Rijia Lin ◽  
Ye Zhao ◽  
...  
Keyword(s):  
Surface Property ◽  
Geometric Structure ◽  
Lipase Immobilization

scholarly journals Toward controlled geometric structure and surface property heterogeneities of TiO2 for lipase immobilization

2020 ◽  
Author(s):  
Wenfeng Zhou ◽  
Xiaohong Zhou ◽  
Wei Zhuang ◽  
Rijia Lin ◽  
Ye Zhao ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Pore Size ◽  
Surface Properties ◽  
Geometric Structure ◽  
Immobilized Enzyme ◽  
Immobilized Lipase ◽  
Immobilized Enzymes ◽  
Relative Activity ◽  
Lipase Immobilization ◽  
Enzyme Molecules

Immobilized enzymes as biocatalysts are expected to solve issues of pollution and economic inefficiency in industrial catalysis. In order to obtain an immobilized enzyme with high activity and stability, the design of substrate geometric structure and surface properties is desirable. Here, TiO2 with controlled pore size and surface properties was designed and synthesized for lipase immobilization, resulting in an efficient biocatalyst. The activity of TiO2 immobilized lipase is improved with the increasing pore size of TiO2 from 10 to 100 nm. Compared to geometric structure impact, regulation of surface properties plays a greater role on the immobilization of lipase on TiO2. Among them, the relative activity of ethenyl triethoxy silane (ETS) modified TiO2 immobilized lipase is as high as 365.85 % over the pristine lipase. This research provides experimental evidence for studying the adsorption of enzyme molecules on the supports under the synergistic effect of geometric structure and surface properties.

The geometric structure and optical response of gaseous endohedral magnesium-fullerenes

2003 ◽  
Vol 50 (15-17) ◽  
pp. 2691-2704 ◽  
Author(s):  
M. Aichinger ◽  
S. A. Chin ◽  
E. Krotscheck ◽  
H. A. Schuessler
Keyword(s):  
Geometric Structure ◽  
Optical Response

Effect of Template Surface Property on Crystal Orientation of Syndiotactic Polystyrene in Nano Template

2012 ◽  
Vol 29 (12) ◽  
pp. 1406
Author(s):  
Meng LI ◽  
Hui WU ◽  
Yan HUANG ◽  
Zhaohui SU
Keyword(s):  
Surface Property ◽  
Crystal Orientation ◽  
Syndiotactic Polystyrene

scholarly journals Neutral signature gauged supergravity solutions

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
J. Gutowski ◽  
W. A. Sabra
Keyword(s):  
Cosmological Constant ◽  
Geometric Structure ◽  
Base Space ◽  
Killing Spinor ◽  
Positive Cosmological Constant ◽  
3 Dimensional

Abstract We classify all supersymmetric solutions of minimal D = 4 gauged supergravity with (2) signature and a positive cosmological constant which admit exactly one Killing spinor. This classification produces a geometric structure which is more general than that found for previous classifications of N = 2 supersymmetric solutions of this theory. We illustrate how the N = 2 solutions which consist of a fibration over a 3-dimensional Lorentzian Gauduchon-Tod base space can be written in terms of this more generic geometric structure.

Effect of charge transfer on the geometric structure of a C70monolayer on the surface of Ag(111)

2012 ◽  
Vol 85 (20) ◽  
Author(s):  
Peng Wang ◽  
Han-Jie Zhang ◽  
Yan-Jun Li ◽  
Chun-Qi Sheng ◽  
Ying Shen ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Geometric Structure

scholarly journals General methods of convergence and summability

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Francisco Javier García-Pacheco ◽  
Ramazan Kama ◽  
María del Carmen Listán-García
Keyword(s):  
Geometric Structure ◽  
Banach Limit ◽  
Limit Operator ◽  
Finite Dimensional ◽  
Free Ultrafilter ◽  
General Method

AbstractThis paper is on general methods of convergence and summability. We first present the general method of convergence described by free filters of $\mathbb{N} $ N and study the space of convergence associated with the filter. We notice that $c(X)$ c ( X ) is always a space of convergence associated with a filter (the Frechet filter); that if X is finite dimensional, then $\ell _{\infty }(X)$ ℓ ∞ ( X ) is a space of convergence associated with any free ultrafilter of $\mathbb{N} $ N ; and that if X is not complete, then $\ell _{\infty }(X)$ ℓ ∞ ( X ) is never the space of convergence associated with any free filter of $\mathbb{N} $ N . Afterwards, we define a new general method of convergence inspired by the Banach limit convergence, that is, described through operators of norm 1 which are an extension of the limit operator. We prove that $\ell _{\infty }(X)$ ℓ ∞ ( X ) is always a space of convergence through a certain class of such operators; that if X is reflexive and 1-injective, then $c(X)$ c ( X ) is a space of convergence through a certain class of such operators; and that if X is not complete, then $c(X)$ c ( X ) is never the space of convergence through any class of such operators. In the meantime, we study the geometric structure of the set $\mathcal{HB}(\lim ):= \{T\in \mathcal{B} (\ell _{\infty }(X),X): T|_{c(X)}= \lim \text{ and }\|T\|=1\}$ HB ( lim ) : = { T ∈ B ( ℓ ∞ ( X ) , X ) : T | c ( X ) = lim  and  ∥ T ∥ = 1 } and prove that $\mathcal{HB}(\lim )$ HB ( lim ) is a face of $\mathsf{B} _{\mathcal{L}_{X}^{0}}$ B L X 0 if X has the Bade property, where $\mathcal{L}_{X}^{0}:= \{ T\in \mathcal{B} (\ell _{\infty }(X),X): c_{0}(X) \subseteq \ker (T) \} $ L X 0 : = { T ∈ B ( ℓ ∞ ( X ) , X ) : c 0 ( X ) ⊆ ker ( T ) } . Finally, we study the multipliers associated with series for the above methods of convergence.

scholarly journals Lipase Immobilization in Mesoporous Silica Nanoparticles for Biofuel Production

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 629
Author(s):  
Aniello Costantini ◽  
Valeria Califano
Keyword(s):  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Mechanical Stability ◽  
Mesoporous Silica Nanoparticles ◽  
Physiological Role ◽  
Biodiesel Production ◽  
Biofuel Production ◽  
Hydroxyl Groups ◽  
Lipase Immobilization ◽  
Wide Range

Lipases are ubiquitous enzymes whose physiological role is the hydrolysis of triacylglycerol into fatty acids. They are the most studied and industrially interesting enzymes, thanks to their versatility to promote a plethora of reactions on a wide range of substrates. In fact, depending on the reaction conditions, they can also catalyze synthesis reactions, such as esterification, acidolysis and transesterification. The latter is particularly important for biodiesel production. Biodiesel can be produced from animal fats or vegetable oils and is considered as a biodegradable, non-toxic and renewable energy source. The use of lipases as industrial catalysts is subordinated to their immobilization on insoluble supports, to allow multiple uses and use in continuous processes, but also to stabilize the enzyme, intrinsically prone to denaturation with consequent loss of activity. Among the materials that can be used for lipase immobilization, mesoporous silica nanoparticles represent a good choice due to the combination of thermal and mechanical stability with controlled textural characteristics. Moreover, the presence of abundant surface hydroxyl groups allows for easy chemical surface functionalization. This latter aspect has the main importance since lipases have a high affinity with hydrophobic supports. The objective of this work is to provide an overview of the recent progress of lipase immobilization in mesoporous silica nanoparticles with a focus on biodiesel production.

High torsion sensitivity sensor based on LPFG with unique geometric structure

2020 ◽  
pp. 1-1
Author(s):  
Chupeng Lu ◽  
Xiren Jin ◽  
Shengjia Wang ◽  
Zihang Xiang ◽  
Cuiting Sun ◽  
...  
Keyword(s):  
Geometric Structure
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