Simultaneous sensing of strain and temperature based on the inline-MZI embedded point-shaped taper structure with low crosstalk.

An embedded spherical dot taper structure (EDT) based on the MZI principle is proposed in this paper, which is mainly fabricated by using two special arc discharges in the preparation process. The proposed structure involves two specialized arc discharge techniques. First, an oversaturated discharge fusion process creates a micro-arc spherical area on the fiber end face to form the first link type. Second, an unsaturated discharge-pulling taper fusion joint creates a local micro-extrusion operation on this micro-arc fiber end face to form the second link. The thermal stress from instantaneous discharge causes a reverse spherical expansion zone to form in the end face structure, similar to the micromachining of long-period fiber gratings that use local CO2 laser etching to create modulated zones. The study involves a mathematical and theoretical analysis of how geometric parameters in the spherical modulation zone impact the structure's characteristic spectrum. The research demonstrates the potential for this structure to function as a light-intensity modulated strain sensor device through both theoretical and experimental means. As per the experimental findings, the optimized structure displays a high level of strain sensing sensitivity at 0.03 dB/µÎµ and temperature sensing sensitivity of 73 pm/°C (20°C-75°C) and 169 pm/°C (75°C-120°C). Additionally, it possesses excellent cross-sensitivity at only ∼0.0015 µÎµ/°C. Therefore, this sensor presents a favorable option for strain and temperature synchronization sensing and monitoring components, and exhibits notable application prospects in precision engineering, which encompasses mechanical manufacturing, the power and electrical industry, healthcare domain, and certain specialized areas of small-scale precision engineering.

Identification and Quantification of the Main Psychoactive Ingredients of Cannabis in Urine Using Excitation-Eemission Matrix Fluorescence Coupled with Parallel Factor Analysis.

Cannabis is the most prevalent abused substance after alcohol, and its consumption severely harms human health and thus adversely impacts society. The identification and quantification of cannabis in urine play important roles in practical forensics. Excitation-emission matrix (EEM) fluorescence spectroscopy coupled with parallel factor (PARAFAC) analysis was developed to identify and quantify the four main ingredients of cannabis in urine samples. The main ingredients of cannabis including Δ-9-tetrahydrocannabinol (THC), cannabidiol, cannabinol, and tetrahydrocannabinolic acid (THC-COOH) exhibited diverse fluorescence characteristics, and the concentrations of these compounds depicted a positive linear relationship with the fluorescence intensity at the ng/mL level. The EEM/PARAFAC method adequately characterized and discriminated the four ingredients in calibration and prediction samples with a low root-mean-square error of prediction (RMSEP; 0.03-0.07 µg/mL) and limit of quantitation (LOQ; 0.26-0.71 µg/mL). The prediction results of the EEM/PARAFAC method well correlated with that of GC-MS with a low RMSEP range (0.01-0.05 µg/mL) and LOQ range (0.07-0.44 µg/mL) in urine samples. The EEM spectroscopic investigation coupled with the PARAFAC algorithm results in an organic, solvent-less, fast, reliable tool to perform accurate and rapid screening of cannabis abusers.

Association of retinopathy with risk of all-cause and specific-cause mortality in the National Health and Nutrition Examination Survey, 2005 to 2008.

Objective: This study aimed to elucidate the relationship between retinopathy status or severity and the all-cause and specific-cause mortality risk based on the updated National Health and Nutrition Examination Survey (NHANES) database and 2019 Public Access Link mortality file. Methods: In this prospective cohort study, a total of 6,797 participants aged over 40 years based on NHANES 2005-2008 were analyzed. The severity of retinopathy was classified into 4 grades-no retinopathy, mild non-proliferative retinopathy (NPR), moderate to severe NPR, and proliferative retinopathy (PR). Multiple covariate-adjusted Cox proportional hazards regression models and Fine and Gray competing risk regression models were used to assess the all-cause and cause-specific mortality risks, respectively. The propensity score matching (PSM) approach was also applied additionally to adequately balance between-group covariates to validate our findings. Results: A final total of 4,808 participants representing 18,282,772 United States (US) non-hospitalized participants were included for analysis, 50.27% were male (n = 2,417), 55.32% were non-hispanic white (n = 2,660), and mean [SE] age, 56.10 [0.40] years. After a median follow-up of 12.24 years (interquartile range, 11.16-13.49 years), 1,164 participants died of all-cause mortality, of which 941 (80.84%) died without retinopathy and 223 (19.16%) died with retinopathy at baseline. The presence of retinopathy was associated with increased all-cause mortality, cardiovascular disease (CVD), and diabetes mellitus (DM)-specific mortality, and the results remain consistent after PSM. Severity analysis showed that only mild NPR was associated with an increased all-cause mortality risk (hazard ratio (HR) = 2.01; 95% confidence interval (CI), 1.00-4.03), while increased CVD and DM-specific mortality risk were associated with all grades of retinopathy and were exponentially greater with increasing retinopathy severity, and the trend test was also significant (P for trend 0.004 and 0.04, respectively). Discussion: Our findings suggest that the diagnosis of retinopathy is an independent risk factor for all-cause mortality in people over 40 years old. Retinopathy grading is significantly associated with the survival risk of patients with CVD or DM, it can be a valuable predictor in the stratified management and risk warning of CVD or DM patients, as well as in the monitoring of systemic vasculopathy status.

Ozone Inhibits APP/Aß Production and Improves Cognition in an APP/PS1 Transgenic Mouse Model.

Alzheimer's disease (AD) is a progressive neurodegenerative disorder without effective treatment. Accumulating evidence demonstrates the production and deposition of amyloid-ß peptides (Aß) in the pathological mechanism of this disease. In our study, we investigated the effect of an ozone intraperitoneal injection on AD pathology in APP/PS1 transgenic mouse model. The male mice (5-months-old) received either ozone intraperitoneal injection (at 30 µg/ml or 50 µg/ml) or abdominocentesis administration daily for 25 days, and they were evaluated in the Morris water maze and the open field test for improvements in spatial learning-memory and working memory and anxious. Prefrontal cortex and hippocampus amyloid-ß precursor protein (APP), along with other relevant biomarkers for AD, were measured through ELISA, western blot and immunohistochemistry. Results showed that ozone ameliorated the behavioral and pathological deterioration of APP/PS1 transgenic mice, and reduced the level of APP, which supports the therapeutic potential of administration of ozone in APP/PS1 mice.

Identification of the PCA29 gene signature as a predictor in prostate cancer.

Prostate cancer (PCa) is the second leading cause of cancer death among men worldwide. About 70% of PCa patients were diagnosed at later stage, and metastasis has been observed. Additionally, the cure rate of PCa closely relies on the early diagnosis with biomarkers. The identification of biomarkers for diagnosis and prognosis is an urgent clinical issue for PCa. Here, we developed a novel scoring strategy, including cluster score (CS) and predicting score (PS), to identify 29 PCa genes (called PCa29) for early diagnostic biomarkers from two datasets in Gene Expression Omnibus. The result indicates that PCa29 can discriminate between normal and tumor tissues and are specific for prostate cancer. To validate PCa29, we found that 97% of PCa29 were consistently significant with these gene expressions in The Cancer Genome Atlas; furthermore, ∼ 70% of PCa29 are consensus to the protein expression in The Human Protein Atlas. Finally, we examined 10 genes in PCa29 on three PCa cell lines by real-time quantitative polymerase chain reaction. The experimental results show that the trend of the differential PCa29 expression is consistent with the analyzed results from our novel scoring method. We believe that our method is useful and PCa29 are potential biomarkers that provide the clues to develop targeting therapy for PCa.

Enhanced Pain Sensitivity with Systemic Ultrastructural Changes of the Nervous Systems after Cobra Venom Injection is Reversed by Electroacupuncture Treatment.

BACKGROUND: Electroacupuncture (EA) has been proved to be effective in treating certain neuropathic pain conditions. The mechanisms of pain relief by EA are not fully understood. There have been sporadic reports of damage in the peripheral nervous system (PNS) and regions of the central nervous system (CNS) at the ultrastructural level following peripheral nerve injury. However, information about possible systemic changes in the PNS and CNS after nerve injury is scarce. OBJECTIVES: The goal of this study was to examine the ultrastructural changes of the nervous system induced by a local injection of cobra venom into the sciatic nerve and to compare the ultrastructural changes in rats with or without treatment with EA or pregabalin. STUDY DESIGN: An experimental study. SETTING: Department of Anesthesiology, Pain Medicine, and Critical Care Medicine, Aviation General Hospital of China Medical University. METHODS: In this study, using an established model of sciatic neuralgia induced by local injection of cobra venom into the sciatic nerve, we examined ultrastructural changes of the PNS and CNS and how they respond to EA and pregabalin treatment. EA and pregabalin were given daily from postoperative day (POD) 14 to 36. Based on previous works, the frequency of EA stimulation of the ST36 and GB34 acupoints was held to 2/100 Hz variable. Pain sensitivity in the sciatic neuralgia rats with and without treatments was assessed using the von Frey test. Ultrastructural alterations were examined bilaterally in the prefrontal cortex, hippocampus, medulla oblongata; and the cervical, thoracic, and lumbar spinal cords on PODs 14, 40, and 60. Ultrastructural examinations were also carried out on the bilateral sciatic nerves and dorsal root ganglion (DRG) at the cervical, thoracic and lumbar levels. In rats treated with EA or pregabalin, the ultrastructure was examined on PODs 40 and 60. RESULTS: Behavioral signs of pain and systemic ultrastructural changes including demyelination were observed at all levels of the PNS and CNS in rats with sciatic neuralgia. After intervention, the mechanical withdrawal thresholds of the EA group and pregabalin group were significantly higher than that of the cobra venom group (P < 0.05). Both EA and pregabalin treatments partially reversed increased cutaneous sensitivity to mechanical stimulation. However, only the EA treatment was able to repair the ultrastructural damages caused by cobra venom. LIMITATIONS: The results confirm that peripheral nerve injury led to the ultrastructural damage at different levels of the CNS as demonstrated with electron microscopy; however, we need to further verify this at both the molecular level and in light microscope level. Sciatic neuralgia induced by cobra venom is a chemical injury, and whether this exactly mimics a peripheral nerve mechanical injury is still unclear. CONCLUSIONS: Local cobra venom injection leads to systemic neurotoxicity. EA and pregabalin alleviate pain via different mechanisms. KEY WORDS: Sciatic neuralgia, cobra venom, demyelination, electroacupuncture, pregabalin, rat model.

The effect of ultrasound-guided percutaneous ozone injection around cervical dorsal root ganglion in zoster-associated pain: a retrospective study.

OBJECTIVE: This study was to evaluate the effectiveness of ultrasound-guided percutaneous ozone injections around the cervical dorsal root ganglions of zoster-associated pain (ZAP) patients. STUDY DESIGN: Retrospective comparative study. SETTINGS: The study was conducted at a pain center of a university hospital. PATIENTS AND METHODS: From June 2016 to July 2017, a total number of 30 patients with ZAP were treated with ultrasound-guided percutaneous ozone injection around the cervical dorsal root ganglion (DRG) at the injured nerve level (C2-C8). A volume of 3 mL ozone-oxygen mixture at a concentration of 30 µg/mL was injected into the area around the DRG. Patients were divided into two groups according to their disease duration: group A (at or <3 months) and group B (>3 months). The pain severity was assessed according to a visual analog scale, and imaging changes were evaluated by ultrasound. Patient improvements in pain and neurologic function were evaluated during a follow-up period from 1 to 3 months. RESULTS: The data showed that ozone injections reduced pain in patients with ZAP. However, the success rate of group A was higher than group B. After the injection, the von Frey data demonstrated decreases in both groups, but, there were no significant differences between the groups. Moreover, univariate logistic regression analysis and multivariate regression analysis showed a history of diabetes mellitus had a significant effect on the treatment results. CONCLUSIONS: Percutaneous ozone injection around the DRG might be a useful method for treatment-resistant cases of ZAP at the cervical level. Institutional Review Board (IRB) approval number: HK2017-1130.