Oakwood Laboratories (United States)

The newly discovered artificial photosynthesis process catalyzed by 2-phenyl indole (PI) and TiCl4 complexes, activated by visible light, produces long-chain oxygenated hydrocarbons up to C17. This process begins with the formation of α-carboxylic acid-ω-aldehyde compounds (C6 to C9), arising from a cascade of autocatalytic organotitanium complexes derived from (PI)2TiCl4. These complexes are formed via hydrolysis through ambient air humidity and the direct atmospheric capture (DAC) of CO2. Carbon chain growth utilizes system-generated formaldehyde as a feedstock. The initial C6 to C9 compounds can further couple into C12 to C17 derivatives through a radical mechanism initiated by hydroxyl radicals. A proposed mechanism explores the synergistic interaction between organotitanium catalysis and hydroxyl radicals. This development represents the only known heterogeneous catalytic system that autonomously captures CO2 and humidity from the atmosphere to subsequently produce long-chain oxygenated hydrocarbons using solar energy.

This chapter highlights new antitumor organotitanium complexes with a pendant biologically active diazo group, participating in bioorthogonal click reactions. Organotitanium complexes are expected to play a pivotal role in the worldwide effort to conquer cancer, due to the human body's high tolerance of the metal and titanium's ability to coordinate with biologically active and proven anticancer ligands. The overall mechanism of the cytotoxic action of organotitanium complexes extensively studied so far, like titanocene dichloride Cp2TiCl2, budotitane, titanocene Y, is incomplete in most cases and not well understood, unlike other metallodrugs, compare with cis-platin. Special emphasis is given to the stability of some newly proposed organotitanium complexes in the physiological aqueous environment, where they are expected to survive before reaching their cell-targeted application. A strategy to monitor the mode of cytotoxic action of candidate antitumor complexes is by tagging them with bioactive side chains like a diazo group, for in-cell site- specific labeling. In this paper we propose for the first time several methods for the preparation of potential antitumor organotitanium complexes with a pendant diazo group, aiming at better understanding their mode of cytotoxic action. In certain instances, Strain-Promoted Azide Cycloaddition (SPAAC) reactions may be employed for bio-imaging through fluorescence or other monitoring purposes. The possibility of engaging any of the three types of organotitanium complexes mentioned above, along with an expanded choice of small molecules, for insertion reactions into the active Ti-C o-bond, aiming at controlling the stability and aqueous solubility of the antitumor candidates, gives rise to a great number of possible effective cytotoxic complexes. A number of the complexes may participate in established “click” reactions of their pendant diazo group with other unsaturated synthons, nitriles, alkynes, alkenes, etc. Several of the established interactions of diazo groups in chemical biology, applied to a number of our complexes carrying the diazo group, may open up new avenues for our understanding of the mechanism of their cytotoxic action and efficacy.

The U.S. housing prices have increased continuously during 2020 and 2021. Although the U.S. economy has been affected by the Covid-19 pandemic greatly, the housing price shows an up-forward trend. This paper researches whether the increasing housing price is a sign of a housing bubble like the bubble in 2006. The research is based on the analysis of the U.S. macroeconomic factors and the historical data. This paper suggests that there is no bubble in the U.S. housing market although the housing price has been increased over the years. On the contrary, the increasing housing price shows the resilience of the U.S. real estate market, and the real estate market is still a strong support for the U.S. economy.

The method to predict the movement of stock market has appealed to scientists for decades. In this article, we use three different models to tackle that problem. In particular, we propose a Deep Neural Network (DNN) to predict the intraday direction of SP500 index and compare the DNN with two conventional machine learning models, i.e. linear regression, support vector machine. We demonstrate that DNN is able to predict SP500 index with relatively highest accuracy.

Abstract We model the ultraviolet spectra of the Seyfert 1 galaxy NGC 5548 obtained with the Hubble Space Telescope during the 6 month reverberation mapping campaign in 2014. Our model of the emission from NGC 5548 corrects for overlying absorption and deblends the individual emission lines. Using the modeled spectra, we measure the response to continuum variations for the deblended and absorption-corrected individual broad emission lines, the velocity-dependent profiles of Lyα and C iv, and the narrow and broad intrinsic absorption features. We find that the time lags for the corrected emission lines are comparable to those for the original data. The velocity-binned lag profiles of Lyα and C iv have a double-peaked structure indicative of a truncated Keplerian disk. The narrow absorption lines show a delayed response to continuum variations corresponding to recombination in gas with a density of ∼105 cm−3. The high-ionization narrow absorption lines decorrelate from continuum variations during the same period as the broad emission lines. Analyzing the response of these absorption lines during this period shows that the ionizing flux is diminished in strength relative to the far-ultraviolet continuum. The broad absorption lines associated with the X-ray obscurer decrease in strength during this same time interval. The appearance of X-ray obscuration in ∼2012 corresponds with an increase in the luminosity of NGC 5548 following an extended low state. We suggest that the obscurer is a disk wind triggered by the brightening of NGC 5548 following the decrease in size of the broad-line region during the preceding low-luminosity state.

Examines the concept of computational reproducibility. Reports on the development of software programming and addresses the challenges of managing software development and developing reliability software update and maintenance procedures.

The Internet of Things (IoT) integrates a variety of different devices that provide more information than can currently be easily handled. While there is much good there are also many problems in the IoT world and not all of the potential solutions can be used in the unique environment of the military. The tactical edge of the military is an even harsher environment with both constrained communications and resources but still having requirements to process data in real time for improved command decisions.

Software's lack of reproduction costs provides benefits to not just legitimate developers but also people who want to use software for criminal purposes. The software community must address this issue or risk disenfranchising the users on whom the software industry depends.