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Nitrous oxide in oxygen (N₂O/O₂) inhalation sedation is used less commonly by Singapore dentists than their counterparts in the United Kingdom and the United States. Using this technique, trained dentists often perform the dual roles of a sedationist and an operating dentist. This paper describes the mechanism of action of N₂O and highlights the modern gas delivery system commonly used in dentistry. The built-in safety features of this unique system helps to ensure that patient-specific therapeutic dosages are effectively and safely administered by dentists. Existing evidence for adverse events and the safety profile of the N₂O/O₂ inhalation sedation is discussed. Finally, recommendations of equipment, training and techniques for safe N₂O/O₂ inhalation sedation are provided.

The surface electrochemical response of the Co^II/Co^I redox process of tetraaminophthalocyaninatocobalt(II) (Co^IITAPc) adsorbed on a graphite electrode, was studied in the pH range of 2–13. In aqueous solution, the Co^IITAPc adsorbed graphite electrode displays very strong electrocatalytic activity toward N₂O reduction to N₂, a process which was examined by cyclic and rotating disk electrode voltammetries. The possible application of this Co^IITAPc modified electrode in N₂O analysis was explored.

In this paper, we study single and double ionizations of N₂O in a short elliptically polarized 800 nm laser pulse using the COLTRIMS technique. The molecular-frame photoelectron angular distribution and the ion sum-momentum distribution of single and double ionizations of N₂O molecules are reported for the single ionization dissociative channel NO${}^{+}$ + N and the double ionization dissociative channel NO${}^{+}$ + N${}^{+}$. The ionizations of multiple orbitals for the two studied dissociative channels were identified via studying the orientation dependent ionization rates for their KERs. The results show that the shape of the ionizing orbitals governs the single and double ionization processes of N₂O.

The emissions of nitric oxide and carbon monoxide from internal combustion engines generate a large impact on the environment and on people's health. Catalytic reduction of these species using platinum group metals has already shown significant potential for emissions control. Since catalysts often use carbon monoxide to reduce nitric oxide in these devices, accurate models of their interaction are required to advance catalyst simulations in order to meet increasingly stringent emissions regulations. As a result, this paper reviews the literature of the NO–CO reaction over platinum in order to develop more precise detailed and global reaction mechanisms for use in exhaust after-treatment modeling activities. Moreover, it is found that the reaction between NO and CO over platinum yields carbon dioxide and nitrogen as main products and nitrous oxide as an important side product. Hence, this paper additionally describes the mechanism for nitrous oxide production in advance of greenhouse gas regulations.

Although agricultural production contributed about 10% of all greenhouse gas emissions in the United States in 2019, existing agricultural practices are capable of making the sector carbon neutral. Whether American agriculture will ultimately achieve carbon neutrality is ultimately a question of political will, not a scientific one. Given the right policy environment, farms and ranches will be able to cut their emissions and use their land to sequester carbon, while becoming more climate resilient, productive, and profitable…