Clinical and Microbiological Evaluation of Diode Laser and Systemic Doxycycline as an Additive to Scaling and Root Planing for Stage II and Stage III Periodontitis Patients.

AIM: To assess and contrast the effectiveness of systemic doxycycline and diode laser as supplements to scaling and root planing (SRP) in terms of clinical and microbiological parameters. MATERIALS AND METHODS: A total of 33 patients diagnosed with periodontitis stages II and III were included and randomized into group A (SRP + diode laser), group B (SRP + doxycycline), and group C (SRP alone). Selected sites were assessed for clinical and microbial parameters-plaque index (PI), gingival index (GI), pocket probing depth (PPD), relative attachment level (RAL), and colony-forming units (CFUs). Every clinical parameter was noted at baseline and after three months. The arithmetic mean, followed by the standard deviation, was calculated for the required assessment intervals. Analysis of variance (ANOVA) was used to compare all parameters between groups, and if the results of the ANOVA test were significant, post hoc analysis was performed. For intragroup comparison, student t-tests were performed. RESULTS: The clinical parameters significantly improved within three months for all groups. In terms of relative attachment level, a statistically significant difference (P < 0.001) was obtained at the three-month interval compared to the baseline value, with the most statistically significant difference seen in group A (3.36±0.50 to 0.64±0.50), followed by group B (3.18±0.40 to 2.18±0.40). The mean pocket probing depth observed at three months, compared to the baseline value, showed a statistically significant difference (P < 0.001) in group A (5.91±0.70 to 2.18±0.40) compared to group B (6.18±0.75 to 4.36±0.50), followed by group C (5.82±0.75 to 5.27±0.64). CONCLUSION: The use of diode laser-assisted pocket disinfection and systemic doxycycline, in addition to scaling and root planing, has proven to be efficient for treating periodontal pockets.

Outcome of Malnourished Children Admitted in the Nutritional Rehabilitation Home.

BACKGROUND: Globally, the burden of malnutrition, especially undernutrition, as well as the consequences of malnutrition is of the rise which is especially of significant concern for underdeveloped countries. Countries like Nepal are also facing a similar problem of malnutrition. In Madhesh province, among the under 5 children the incidence of chronic malnutrition is 29.3%. Our aim is to assess the malnourishment in the children of Madhesh province in Nepal. METHODS: This cross-sectional quantitative study was carried out among 409 malnourished children who were admitted from July 17, 2018 to July 16, 2022 at NRH in Gajendra Narayan Singh Hospital. Collected data were fed into Microsoft-excel and analyzed using SPSS software, version-2016. As data were normally distributed, frequency, percentage, mean and standard deviation were calculated for descriptive analysis. To find out the association of categorical variables, the Chi-square test or Fisher's Exact test was used where appropriate. P-value <0.05 was significant. RESULTS: Out of 409 malnourished cases, 145 cases were SAM (SD<-3) and 264 cases were MAM (-2 to -3SD) at the time of admission. The mean increment in the weight was 1.14±0.44  kg.  The average length of stay was 19.82±8.73 days. There is a significant difference (p<0.001) in the length of stay among the SAM and MAM cases of our study and a difference in the increment of weight in comparison to mean weight gain (1.14±0.44  kg) with respect to the length of stay of the malnourished child who stayed for more than 28 days and less. CONCLUSIONS: There is significant weight gain in malnourished children after management at the Nutritional Rehabilitation Center.

Exploring the associative learning capabilities of the segmented attractor network for lifelong learning.

This work explores the process of adapting the segmented attractor network to a lifelong learning setting. Taking inspirations from Hopfield networks and content-addressable memory, the segmented attractor network is a powerful tool for associative memory applications. The network's performance as an associative memory is analyzed using multiple metrics. In addition to the network's general hit rate, its capability to recall unique memories and their frequency is also evaluated with respect to time. Finally, additional learning techniques are implemented to enhance the network's recall capacity in the application of lifelong learning. These learning techniques are based on human cognitive functions such as memory consolidation, prediction, and forgetting.

A deep learning approach for lower back-pain risk prediction during manual lifting.

Occupationally-induced back pain is a leading cause of reduced productivity in industry. Detecting when a worker is lifting incorrectly and at increased risk of back injury presents significant possible benefits. These include increased quality of life for the worker due to lower rates of back injury and fewer workers' compensation claims and missed time for the employer. However, recognizing lifting risk provides a challenge due to typically small datasets and subtle underlying features in accelerometer and gyroscope data. A novel method to classify a lifting dataset using a 2D convolutional neural network (CNN) and no manual feature extraction is proposed in this paper; the dataset consisted of 10 subjects lifting at various relative distances from the body with 720 total trials. The proposed deep CNN displayed greater accuracy (90.6%) compared to an alternative CNN and multilayer perceptron (MLP). A deep CNN could be adapted to classify many other activities that traditionally pose greater challenges in industrial environments due to their size and complexity.

Memristive device based learning for navigation in robots.

Biomimetic robots have gained attention recently for various applications ranging from resource hunting to search and rescue operations during disasters. Biological species are known to intuitively learn from the environment, gather and process data, and make appropriate decisions. Such sophisticated computing capabilities in robots are difficult to achieve, especially if done in real-time with ultra-low energy consumption. Here, we present a novel memristive device based learning architecture for robots. Two terminal memristive devices with resistive switching of oxide layer are modeled in a crossbar array to develop a neuromorphic platform that can impart active real-time learning capabilities in a robot. This approach is validated by navigating a robot vehicle in an unknown environment with randomly placed obstacles. Further, the proposed scheme is compared with reinforcement learning based algorithms using local and global knowledge of the environment. The simulation as well as experimental results corroborate the validity and potential of the proposed learning scheme for robots. The results also show that our learning scheme approaches an optimal solution for some environment layouts in robot navigation.

Novel synaptic memory device for neuromorphic computing.

This report discusses the electrical characteristics of two-terminal synaptic memory devices capable of demonstrating an analog change in conductance in response to the varying amplitude and pulse-width of the applied signal. The devices are based on Mn doped HfO2 material. The mechanism behind reconfiguration was studied and a unified model is presented to explain the underlying device physics. The model was then utilized to show the application of these devices in speech recognition. A comparison between a 20 nm × 20 nm sized synaptic memory device with that of a state-of-the-art VLSI SRAM synapse showed ~10× reduction in area and >10(6) times reduction in the power consumption per learning cycle.

Erythrocyte membrane transporters during human ageing: modulatory role of tea catechins.

Ageing is associated with many physiological and cellular changes, many of which are due to alterations in the plasma membrane. The functions of membrane transporter proteins are crucial for the maintenance of ionic homeostasis between the extra- and intracellular environments. The aim of the present study was to determine the status of erythrocyte membrane transporters, specifically Ca(2+) -ATPases, Na(+) /K(+) -ATPases and the Na(+) /H(+) exchanger (NHE), during ageing in humans. Furthermore, because tea catechins have been reported to possess strong anti-oxidant potential, the study was extended to evaluate the effect of (-)-epicatechin (EC), (-)-epicatechin-3-gallate (ECG), (-)-epigallocatechin (EGC) and (-)-epigallocatechin-3-gallate (EGCG) on these transporters as a function of human age. The study was performed on 97 normal healthy subjects (62 men, 35 women; 16-80 years old). To investigate the effects of tea catechins, subjects were divided into three groups: young (<40 years old; n = 34); middle-aged (40-60 years old; n = 32); and old (>60 years old; n = 31). Erythrocyte ghosts/cell suspension from each group were incubated with ECG, EGCG, EGC and EC (10 µmol/L) for 30 min at 37°C prior to assay. Ageing significantly increased NHE activity and decreased Ca(2+) -ATPase activity. There were no significant changes in Na(+) /K(+) -ATPase activity during the ageing process. (-)-Epigallocatechin-3-gallate, EGC, ECG and EC effectively mitigated the changes in membrane transporter activity in erythrocytes from all age groups; however, the effect was more pronounced in the old age group. We hypothesize that impairment in -bound transporters may be one of the possible mechanisms underlying the pathological events during ageing. A higher intake of catechin-rich food may provide some protection against age-dependent diseases.

Carbonyl formation in erythrocyte membrane proteins during aging in humans.

BACKGROUND: Studies have shown that oxidative stress increases with increasing human age. Protein carbonyl accumulation is an indicator of oxidative damage to proteins during aging in cells and tissues. The present study is focused on the relationship between human age and protein oxidation in erythrocyte membranes in a healthy Indian population. MATERIALS AND METHODS: The sample included healthy human subjects (n = 49) between the ages of 17 to 80 years. Their blood was collected and assayed spectrophotometrically for oxidative protein damage in terms of protein carbonyls and plasma antioxidant capacity in terms of FRAP. RESULTS: Protein carbonyl content was found to increase in an age-related pattern indicating an increase in oxidative protein damage in older subjects (p <0.0001, r = 0.8269). There was also a significant negative correlation between protein oxidation and plasma antioxidant capacity measured in terms of ferric reducing antioxidant potential (FRAP) values (p<0.0001; r = -0.8695). CONCLUSION: Our results substantiate the occurrence of oxidative stress during human aging. Elevated erythrocyte membrane carbonyl levels found with increasing age in this study may be viewed as a biomarker for aging.

Strategies for the discovery of anti-aging compounds.

IMPORTANCE OF THE FIELD: Life expectancy has increased across the globe and the number of aged people is increasing rapidly. With the rise in the average age of people, the prevalence of age related pathologies has also increased and thus the strategies to find anti-aging molecules assume significance. Anti-aging basically concerns the prevention or delaying the alterations taking place as a function of age which are manifested as age-associated illnesses. AREAS COVERED IN THIS REVIEW: This review covers anti-aging strategies involving supplementation of dietary antioxidants such as polyphenols, vitamins E and C, lipoic acid, acetyl carnitine, carnosine and cysteine along with the application of mammalian target of rapamycin inhibitors and plasma membrane redox system activators. It also presents the use of different hormone supplementation, for example, melatonin, dehydroepiandrosterone, growth hormone and sex hormones as a tool against aging. The use of caloric restriction and calorie restriction mimetics as an anti-aging intervention is also reviewed. WHAT THE READER WILL GAIN: The concept, use and efficacy of different anti-aging approaches. TAKE HOME MESSAGE: Despite a lot of research and sustained ongoing efforts, finding a viable anti-aging therapy which can extend the maximum human lifespan remains elusive. However, several interventions aimed towards a longer healthy life seem promising.

Activation of erythrocyte plasma membrane redox system provides a useful method to evaluate antioxidant potential of plant polyphenols.

Plant polyphenols are known to possess antioxidant activities. In recent years, there have been numerous reports confirming the efficacy of these compounds to improve plasma antioxidant capacity in humans. Current methods to evaluate the antioxidant potential of polyphenols are based on in vitro assay procedures (TEAC, ORAC, FRAP, DPPH). However, the antioxidant potential assessed by these methods does not correlate with the biological activity observed in vivo. Eukaryotic cells display a plasma membrane redox system (PMRS) that transfers electrons from intracellular substrates to extracellular electron acceptors. Here, we describe a method to evaluate the antioxidant potential of plant polyphenols based on their ability to enter the erythrocytes and donate electrons to PMRS. We also present results to show the potentiating effect of quercetin, EGCG, EC and catechin on erythrocyte PMRS activity.

Age-dependent decline in erythrocyte acetylcholinesterase activity: correlation with oxidative stress.

BACKGROUND: Oxidative stress hypothesis offers a mechanism for the aging process and its involvement in other pathologies such as diabetes and neurodegenerative diseases like Alzheimer. AChE activity in erythrocytes may be considered as a marker of central cholinergic status. The present study was undertaken to (i) determine the activity of erythrocyte AChE as a function of human process (ii) correlate AChE activity with oxidative stress during human aging. MATERIAL AND METHODS: Blood was collected from healthy subjects (n = 37) 22-82 years. Erythrocyte AChE activity, MDA and plasma antioxidant capacity in terms of FRAP was measured spectrophotometrically. RESULTS: There was a marked decrease in AChE activity with increasing age. The reduction in activity of AChE correlated well with increased lipid peroxidation and a decrease in FRAP values. CONCLUSION: Decreased antioxidant defense, and alteration in membrane rheology during aging process both may contribute towards decreased activity of AChE in erythrocyte membrane. This finding may help in explaining the neuronal complications taking place under conditions of oxidative stress, aging, and dementia.

Ascorbate recycling by erythrocytes during aging in humans.

Erythrocytes play a crucial role in recycling ascorbate in blood plasma. The erythrocyte ascorbate free radical (AFR) reductase is involved in the reduction of AFR to ascorbic acid (ASC) in the plasma. In the present study, we report an age-dependent increase in the activity of erythrocyte AFR reductase in humans that shows a significant positive correlation with the activity of plasma membrane redox system (PMRS). We explain the age-dependent increase in erythrocyte ASC recycling on the basis of a compensatory/protective mechanism that operates to maintain the ASC level in plasma and thereby minimize oxidative stress during aging.

Erythrocyte plasma membrane redox system in human aging.

Eukaryotic cells display a plasma membrane redox system (PMRS) that transfers electrons from intracellular substrates to extracellular electron acceptors. The physiologic importance of PMRS is still not fully understood. The authors have carried out studies to determine the activity of PMRS in human erythrocytes as a function of age and correlate the activity with total plasma antioxidant capacity in an effort to understand the role of PMRS in human aging. The study was carried out on 80 normal healthy subjects of both genders between the ages of 18 and 85 years. The activity of erythrocyte PMRS was estimated by following the reduction of ferricyanide. The total antioxidant capacity of the plasma was estimated in terms of Ferric Reducing Ability of Plasma (FRAP) values. A significant (p < 0.0001) positive correlation (r = 0.7797) is observed between PMRS activity of erythrocytes and human age. There is an age-dependent decrease in total plasma antioxidant capacity measured in terms of FRAP values. A highly significant correlation is observed between PMRS activity and plasma FRAP values. The authors hypothesize that the increased PMRS in erythrocytes during aging may be a protective mechanism of the system for efficient extracellular DHA reduction and ascorbate recycling under condition of increased oxidative stress.