Marimo actuated rover systems

Background The potential to directly harness photosynthesis to make actuators, biosensors and bioprocessors has been previously demonstrated in the literature. Herein, this capability has been expanded to more advanced systems — Marimo Actuated Rover Systems (MARS) — which are capable of autonomous, solar powered, movement. Results We demonstrate this ability is both a practical and viable alternative to conventional mobile platforms for exploration and dynamic environmental monitoring. Prototypes have been successfully tested to measure their speed of travel and ability to automatically bypass obstacles. Further, MARS is electromagnetically silent, thus avoiding the background noise generated by conventional electro/mechanical platforms which reduces instrument sensitivity. The cost of MARS is significantly lower than platforms based on conventional technology. Conclusions An autonomous, low-cost, lightweight, compact size, photosynthetically powered rover is reported. The potential for further system enhancements are identified and under development.

Agricultural Greenhouses in São Tomé and Príncipe

Since 2016, STP has been funding the implementation of greenhouses, viewed as a viable way to guarantee, increase, and diversify production; supply the market; improve farmers' incomes; and mitigate climate change impacts. The greenhouses in selected districts were based on farmers' experiences in horticultural production, available agricultural area, and capacity of rural communities to organize themselves into small farmers' cooperatives. There are also private greenhouse initiatives. This chapter analyzed the current situation of the STP greenhouse project and its socioeconomic contribution to rural communities, proposing actions for its improvement, addressing climate changes and poverty reduction. Despite several weaknesses, mainly linked to lack of knowledge and mastery of technology, greenhouse production represents a viable alternative for horticulture development. Greenhouses, properly exploited, are a mechanism to mitigate climate change effects and ensure an increase in income and consequently reduce poverty and improve individual and collective living conditions.

La(III)-curcumin-functionalized gold nanocomposite as the red light-activable, mitochondria-targeting PDT agent

Red light-activable transition metal complexes have recently emerged as the viable alternative for photodynamic/photochemotherapeutic applications. Ideal photosensitizers or photochemotherapeutic agents are still an elusive goal. Here in, we have reported...

Engineering of Reductive Aminases for Asymmetric Synthesis of Enantiopure Rasagiline

Reductive aminases (RedAms) for the stereoselective amination of ketones represent an environmentally benign and economically viable alternative to transition metal–catalyzed asymmetric chemical synthesis. Here, we report two RedAms from Aspergillus calidoustus (AcRedAm) and bacteria (BaRedAm) with NADPH-dependent features. The enzymes can synthesize a set of secondary amines using a broad range of ketone and amine substrates with up to 97% conversion. To synthesize the pharmaceutical ingredient (R)-rasagiline, we engineered AcRedAm through rational design to obtain highly stereoselective mutants. The best mutant Q237A from AcRedAm could synthesize (R)-rasagiline with >99% enantiomeric excess with moderate conversion. The features of AcRedAm and BaRedAm highlight their potential for further study and expand the biocatalytic toolbox for industrial applications.

Prisoners of a Metaphor: Secularization as a Deicidal Epidemic

The article discusses the first reactions of many distinguished commentators to the impact that the CoViD-19 pandemic had on people’s religious life globally. Such across-the-board response is investigated against the background of Peter Sloterdijk’s exemplary reinterpretation of the religious vertical impulse in terms of anthropotechnics and is found defective. A more nuanced and ambivalent account of secularization is offered in the end as a viable alternative to the standard thesis of the disenchantment of the world.

Performance Analysis of Direct Torque Controllers in Five-Phase Electrical Drives

The industrial application of electric machines has grown in the last decades, thanks to the development of microprocessors and power converters, which have permitted their use as variable-speed drives. Although three-phase machines are the common trend, the interest of the research community has recently focused on machines with more than three phases, known as multiphase machines. The principal reason lies in the exploitation of their advantages in terms of reliability, i.e., post-fault operating capability. Additionally, multiphase machines provide a better current distribution among phases, and lower current harmonic production in the power converter, than conventional three-phase machines. However, multiphase drive applications require the development of complex controllers to regulate the torque (or speed) and flux of the machine. In this regard, direct torque controllers have appeared as a viable alternative due to their easy formulation and high flexibility to incorporate control objectives. However, these controllers face some peculiarities and limitations in their use that require attention. This work aims to tackle direct torque control as a viable alternative for the regulation of multiphase drives. Special attention will be paid to the development of the control technique and the expected benefits and limitations in the obtained results. Case examples based on symmetrical five-phase induction machines with distributed windings in the motoring mode of operation will be used to this end.

Celibacy or Marriage? Dilemmas for Buddhist Monks in Korea

Following the Confucian period of the Chosŏn era, which overshadowed Buddhists and confined them to the margins of society, at the beginning of Japanese colonial rule the possibility of monastic marriage typical of Japanese practice emerged as a viable alternative for Korean Buddhists in the early twentieth century. While the repressive memory of Japanese colonial heritage often appears in the relevant literature about clerical marriage today as the main reason for Korean Buddhists to get married, an analysis of contemporary documents presents us with a much more complex picture. Most notably among Korean intellectuals, one of the most significant personalities of the era, Manhae Han Young’un’s (1879−1944) systematically urged the reform of Korean Buddhism, Chosŏn Pulgyo yusinnon 朝鮮 佛 敎 維新 論 (Treatise on the Restoration of Korean Buddhism). In connection with the presentation and circumstances of the thirteenth point formulated to allow polemics and the practice of priestly marriage, we can see that his Confucian education, personality, and life play as important a part in his reasoning as the ideologies of the era, social Darwinism and modernism, and democracy. But primary sources revealing the daily lives and circumstances of the monks also show that thewillingness to marry was also greatly influenced by the new inheritance rules introduced in the Japanese colonial system.