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Low-back pain affects 84% of the world's population. At present, no method of treatment can be considered as the method of choice. Acupuncture is effective, scientific, cost-effective, and free from major side-effects. Three illustrative cases, showing the beneficial effects of acupuncture are presented. VO-Ohpic Attention is drawn to the possible presence of underlying sacroiliac-joint dysfunction, which could masquerade as sciatica, hip pain, and/or groin pain.Background The ability to produce force is critical to several daily activities. Strategies to reduce delayed onsent muscle soreness (DOMS) and restore force-generating properties that occur in response to training and impair physical performance have been proposed. Acupuncture has been proposed to accelerate recovery and optimize muscle functioning. It was to determine the effects of acupuncture on DOMS and on the muscle force production capacity. Methods Thirty physically active volunteers (26.3 ± 3.1 years old, 1.70 ± 0.08 m, 66.5 ± 12.6 kg) were allocated in a control (CG; n = 10), placebo (PG; n = 10), and acupuncture (AG; n = 10) groups. The groups were subjected to an exercise protocol to induce DOMS and were assessed for muscle force, threshold, and rate of perceived pain and activation of the biceps brachialis muscle before (PRE) and 20 minutes after (POST) a single acupuncture session using a mixed model analysis. Results The threshold and rate of perceived pain were reduced in the AG (P  0.05). Conclusions Acupuncture may reduce discomfort and improve muscle activation but was not effective to promote force improvement and/or restore the force-generating properties. It may be speculated that muscle disruption may have played a role and did not allow participants to restore their muscular performance. Rebec Number; RBR-8bh5k7 (www.ensaiosclinicos.gov.br/rg/RBR-8bh5k7); Clinical Trial Registry (UTN No. U1111-1234-9553).Objective The world is experiencing challenging times caused by spread of the Coronavirus Disease 2019 (COVID-19), which is caused by infection with Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2). Hypertension and type 2 diabetes mellitus are the most prevalent comorbidities of COVID-19. This review discusses several studies that showed the effect of acupuncture on hypertension and type 2 diabetes mellitus, and that discussed the mechanism of acupuncture, points used, and treatment strategies. Method Literature was searched for studies published from 2016 to 2020 on how acupuncture affects hypertension and type 2 diabetes mellitus on the Google Scholar and PubMed databases using the keywords acupuncture, diabetes mellitus, and hypertension. Randomized clinical trials on human subjects, studies that measured systolic blood pressure (SBP) and diastolic blood pressure (DBP) as outcomes, and studies that measured plasma glucose level as the outcome were included. Studies that did not include clinical effects of acupuncture were excluded. Results Studies on hypertension (n = 2) and type 2 diabetes mellitus (n = 2) were found. These studies suggested that acupuncture might be able to reduce SBP and DBP, fasting plasma glucose level, oral glucose tolerance, and random blood glucose level. Conclusions Preliminary studies have suggested that acupuncture might reduce BP in hypertension and reduce blood sugar and insulin resistance in type 2 diabetes mellitus. More research is required to demonstrate if acupuncture is a useful adjunct for treating hypertension and type 2 diabetes mellitus as comorbidities of COVID-19.Anatase TiO2 nanoparticle aggregates were used as model systems for studying at different water activities the reactivity of electron centers at semiconductor surfaces. The investigated surface conditions evolve from a solid/vacuum interface to a solid/bulk electrolyte interface. Hydrogen-related electron centers were generated either chemically-upon sample exposure to atomic hydrogen at the semiconductor/gas interface-or electrochemically-upon bias-induced charge accumulation at the semiconductor/electrolyte interface. Based on their corresponding spectroscopic and electrochemical fingerprints, we investigated the reactivity of hydrogen-related electron centers as a function of the interfacial condition and at different levels of complexity, that is, (i) for dehydrated and (partially) dehydroxylated oxide surfaces, (ii) for oxide surfaces covered by a thin film of interfacial water, and (iii) for oxide surfaces in contact with a 0.1 M HClO4 aqueous solution. Visible (Vis) and infrared (IR) spectroscopy evidence a chemical equilibrium between hydrogen atoms in the gas phase and-following their dissociation-electron/proton centers in the oxide. The excess electrons are either localized forming (Vis-active) Ti3+ centers or delocalized as (IR-active) free conduction band electrons. The addition of molecular oxygen to chemically reduced anatase TiO2 nanoparticle aggregates leads to a quantitative quenching of Ti3+ centers, while a fraction of ∼10% of hydrogen-derived conduction band electrons remains in the oxide pointing to a persistent hydrogen doping of the semiconductor. Neither trapped electrons (i.e., Ti3+ centers) nor conduction band electrons react with water or its adsorption products at the oxide surface. However, the presence of an interfacial water layer does not impede the electron transfer to molecular oxygen. At the semiconductor/electrolyte interface, inactivity of trapped electrons with regard to water reduction and electron transfer to oxygen were evidenced by cyclic voltammetry.Understanding the adsorption and photoactivity of acetic acid and trimethyl acetic acid on TiO2 surfaces is important for improving the performance of photocatalysts and dye-sensitized solar cells. Here we present a structural study of adsorption on rutile TiO2(100)-1 × 1 and -1 × 3 using Scanning Tunnelling Microscopy and Density Functional Theory calculations. Exposure of both terminations to acetic acid gives rise to a ×2 periodicity in the [001] direction (i.e., along Ti rows), with a majority ordered c(2 × 2) phase in the case of the 1 × 1 termination. The DFT calculations suggest that the preference of c(2 × 2) over the 2 × 1 periodicity found for TiO2(110)-1 × 1 can be attributed to an increase in interadsorbate Coulomb repulsion. Exposure of TiO2(100)-1 × 1 and -1 × 3 to trimethyl acetic acid gives rise to largely disordered structures due to steric effects, with quasi-order occurring in small areas and near step edges where these effects are reduced.