Metal-organic frameworks as selective or chiral oxidation catalysts

Since the discovery of Metal Organic Frameworks (MOFs) in the early 1990s, the amount of new structures has grown exponentially. A MOF typically consists of inorganic nodes that are connected by organic linkers to form crystalline, highly porous structures. MOFs have attracted a lot of attention lately, as the versatile design of such materials holds promises of interesting applications in various fields. In this review, we will focus on the use of MOFs as heterogeneous oxidation catalysts. MOFs are very promising candidates to replace homogeneous catalysts by sustainable and stable heterogeneous catalysts. The catalytic active function can be either the active metal sites of the MOF itself or can be introduced as an extra functionality in the linker, a dopant or a "ship-in-a-bottle" complex. As the pore size, pore shape, and functionality of MOFs can be designed in numerous ways, shape selectivity, and even chiral selectivity can be created. In this article, we will present an overview on the state of the art of the use of MOFs as a heterogeneous catalyst in liquid phase oxidation reactions

Non-degradative ubiquitination in Smad-dependent TGF-β signaling

Transforming growth factor-β (TGF-β) signaling is tightly regulated at the level of post-translational modification to transmit quantitative difference in ligand concentration into proportional transcriptional output. Ubiquitination is one such modification with several E3 ubiquitin ligases implicated in TGF-β signaling in marking crucial pathway components for proteasomal degradation. However, ubiquitination, particularly in the mono- or oligo-ubiquitin modifying form, is also known to regulate incorporation of substrate proteins into signaling complexes that involved in DNA repair, kinase activation, and endocytosis. This review focuses on recent advances in understanding the role of such non-degradative ubiquitination in TGF-β signaling

Error Analysis of Virtual Element Methods for the Time-dependent Poisson-Nernst-Planck Equations

We discuss and analyze the virtual element method on general polygonal meshes for the time-dependent Poisson-Nernst-Planck equations, which are a nonlinear coupled system widely used in semiconductors and ion channels. The spatial discretization is based on the elliptic projection and the $L^2$ projection operator, and for the temporal discretization, the backward Euler scheme is employed. After presenting the semi and fully discrete schemes, we derive the a priori error estimates in the $L^2$ and $H^1$ norms. Finally, a numerical experiment verifies the theoretical convergence results

Exploring the Retargeting Strategy of Telepresence

Retargeting is based on the “Rule of Seven”, which is an old theory coined by Dr. Jeffrey Lant and states that a customer must to be touched 7 times before becoming aware of a product or service and take action. Thus, it is critical to increase consumer touch points through Retargeting to drive potential sales. Therefore, this study strives to explore the remarketing strategies of virtual reality (VR) retargeting campaigns in accordance with telepresence theory for the tourism industry. VR telepresence is proposed as a formative second-order construct driven by reality judgement, internal/external correspondence, and attention/abortion. We further found that consumers’ experiences with VR retargeting campaigns were classified as either positive or negative effects on their sense of immersion to enhance consumer purchase intention. Finally, it hopes to provide more insights on VR design strategies of experiential marketing for the tourism industry. Based on a survey by Statista (2017), 96% of internet users in the U.S. would leave an online shopping website without making a purchase, suggesting that very few people would actually buy something during their first visit to a site, even if they have the intention to do so. Another study by OmniVirt (2018), based on over 700 million ads served, found that in a promotional campaign that was displayed 700 million times, 85% of internet users are willing to finish watching a 360-degree video, compared to 58% for its 2D video counterpart. In order to produce advertisements that attract a wider audience and boost sales, more and more brands are turning to immersive experiences. Compared to traditional ad campaigns featuring similar elements and positioning, immersive advertising can lead to higher click through rates, which in turn increases brand awareness (Parikh, 2019). With a view to enhancing consumers’ experience with retargeting marketing campaigns, the present study addresses how precision and immersive experiential marketing targeted at potential customers can increase their motivation to purchase. Based on Marvin Minsky’s (1980) theory of telepresence, three virtual reality (VR) scenarios featuring life-like images and audios are designed and stimulated by a computing device in a high-fidelity stereoscopic virtual 3D space, creating an immersive user experience. Through this immersive virtual experience (Lanier, 1988), the author examines consumers’ emotional states evoked by the virtual environment, which serves as the basis for further discussion on the effectiveness of VR retargeting travel ads. Research methods employed in this study to measure participants’ positive and negative emotions include administering a written questionnaire and monitoring their brainwave activities. In sum, the main objective of the present study is to explore the impacts of telepresence as well as the quality of retargeting on consumer purchase behavior. The expected contributions of this study are threefold: (1) addressing the quality of retargeting advertising (which has yet to be thoroughly explored in the past) in order to formulate a better understanding of the interaction between advertising quality and consumer behavior; (2) incorporating telepresence as part of consumer experience has a positive impact on retargeting advertising, encouraging potential buyers to take action; and (3) brain wave analysis can offer insights into participant’ positive and negative emotions, which improves the validity of this study. In conclusion, this study strives to explore the remarketing strategies of virtual reality (VR) retargeting campaigns in accordance with telepresence theory for the tourism industry. The practical findings of the present study can serve as a reference for digital marketers in setting the optimal advertising strategies to elicit the desire to purchase from prospective customers

POM@MOF hybrids : synthesis and applications

The hybrid materials that are created by supporting or incorporating polyoxometalates (POMs) into/onto metal–organic frameworks (MOFs) have a unique set of properties. They combine the strong acidity, oxygen-rich surface, and redox capability of POMs, while overcoming their drawbacks, such as difficult handling, a low surface area, and a high solubility. MOFs are ideal hosts because of their high surface area, long-range ordered structure, and high tunability in terms of the pore size and channels. In some cases, MOFs add an extra dimension to the functionality of hybrids. This review summarizes the recent developments in the field of POM@MOF hybrids. The most common applied synthesis strategies are discussed, together with major applications, such as their use in catalysis (organocatalysis, electrocatalysis, and photocatalysis). The more than 100 papers on this topic have been systematically summarized in a handy table, which covers almost all of the work conducted in this field up to now