Elucidation of the Role of Lipids in Late Endosomes on the Aggregation of Insulin.

Abrupt aggregation of misfolded proteins is the underlying molecular cause of numerous pathologies including diabetes type 2 and injection amyloidosis. Although the exact cause of this process is unclear, a growing body of evidence suggests that protein aggregation is linked to a high protein concentration and the presence of lipid membranes. Endosomes are cell organelles that often possess high concentrations of proteins due to their uptake from the extracellular space. However, the role of endosomes in amyloid pathologies remains unclear. In this study, we used a set of biophysical methods to determine the role of bis(monoacylglycero)phosphate (BMP), the major lipid constituent of late endosomes on the aggregation properties of insulin. We found that both saturated and unsaturated BMP accelerated protein aggregation. However, very little if any changes in the secondary structure of insulin fibrils grown in the presence of BMP were observed. Therefore, no changes in the toxicity of these aggregates compared to the fibrils formed in the lipid-free environment were observed. We also found that the toxicity of insulin oligomers formed in the presence of a 77:23 mol/mol ratio of BMP/PC, which represents the lipid composition of late endosomes, was slightly higher than the toxicity of insulin oligomers formed in the lipid-free environment. However, the toxicity of mature insulin fibrils formed in the presence of BMP/PC mixture was found to be lower or similar to the toxicity of insulin fibrils formed in the lipid-free environment. These results suggest that late endosomes are unlikely to be the source of highly toxic protein aggregates if amyloid proteins aggregate in them.

Non-invasive identification of combined salinity stress and stalk rot disease caused by Colletotrichum graminicola in maize using Raman spectroscopy.

Food security is an emerging problem that is faced by our civilization. There are millions of people around the world suffering from various kinds of malnutrition. The number of people that starve will only increase considering the continuous growth of the world's population. The problem of food security can be addressed by timely detection and identification biotic and abiotic stresses in plants that drastically reduce the crop yield. A growing body of evidence suggests that Raman spectroscopy (RS), an emerging analytical technique, can be used for the confirmatory and non-invasive diagnostics of plant stresses. However, it remains unclear whether RS can efficiently disentangle biotic and abiotic stresses, as well as detect both of them simultaneously in plants. In this work, we modeled a stalk rot disease in corn by inoculating the plant stalks with Colletotrichum graminicola. In parallel, we subjected plants to salt stress, as well as challenging plants with both stalk rot disease and salinity stress simultaneously. After the stresses were introduced, Raman spectra were collected from the stalks to reveal stress-specific changes in the plant biochemistry. We found that RS was able to differentiate between stalk rot disease and salinity stresses with 100% accuracy, as well as predict presence of both of those stresses in plants on early and late stages. These results demonstrate that RS is a robust and reliable approach that can be used for confirmatory, non-destructive and label-free diagnostics of biotic and abiotic stresses in plants.

A checklist of spiders of Nepal (Arachnida; Araneae).

Spiders (order Araneae) have a worldwide distribution. As of June 17, 2022, the World spider catalog, Version 23.0, enlists 50,188 species of spiders from throughout the world. Except for the open sea and air, spiders live in every ecological environment. They prefer densely vegetated environments and are the world's seventh most diverse group of creatures in terms of species diversity. The checklist of spiders of south Asia mentions 222 spider species from Nepal, grouped into 23 families. However, the official database of the Nepalese government only lists 175 species of Nepalese spiders. This checklist is a vital update to the diversity of the spider fauna of Nepal. The goal is to compile a thorough list of all the spiders found in Nepal. We have enlisted 386 different spider species from Nepal, belonging to 135 different genera and 34 different families, after reviewing previous scientific publications, computer databases of the Nepalese government, and the World spider catalog, Version 23.0. It adds a total of 211 new spiders to Nepal's biodiversity database. Linyphiidae and Salticidae spiders dominate accounting for 27.46 percent and 17.36 percent of total species, respectively, on the checklist. Corrections to previous misidentifications are also included in this checklist, as well as taxonomy revisions. Synonymous species are sorted out to avoid recurrence. The trends in Nepalese spider discovery and dispersion have also been studied.

Rapid detection of pesticide in milk, cereal and cereal based food and fruit juices using paper strip-based sensor.

The study was aimed to validate paper strip sensors for the detection of pesticide residues in milk, cereal-based food, and fruit juices in comparison with GC-MS/MS under field conditions. The detection limit of pesticide using rapid paper strip sensor for organophosphate, carbamate, organochlorine, fungicide, and herbicide group ranges from 1 to 10, 1-50, 250-500, 1-50, and 1 ppb, respectively in milk and milk product, cereal-based food and fruit juices. Among 125 samples of milk samples collected from the market 33 milk samples comprising 31 raw milk and 2 pasteurized milk found positive for pesticide using the strip-based sensor. In cereal based food and fruit juice samples, 6 cereal flours and 4 fruit juices were found positive for pesticide residues. The pesticide positive samples were further evaluated quantitatively using GC-MS/MS wherein 7 samples comprised of raw milk, pasteurized milk, rice flour, wheat flour, maize flour, apple juice, and pomegranate juice have shown the presence of chlorpyrifos, chlorpyrifos-methyl, α-endosulfan, ß-endosulfan DDD and DDT at trace level as well as at above MRL level. It is envisaged that the developed paper strip sensor can be a potential tool in the rapid and cost-effective screening of a large number of food samples for pesticide residues.

Quantitative analysis of Sudan dye adulteration in paprika powder using FTIR spectroscopy.

As adulteration of foodstuffs with Sudan dye, especially paprika- and chilli-containing products, has been reported with some frequency, this issue has become one focal point for addressing food safety. FTIR spectroscopy has been used extensively as an analytical method for quality control and safety determination for food products. Thus, the use of FTIR spectroscopy for rapid determination of Sudan dye in paprika powder was investigated in this study. A net analyte signal (NAS)-based methodology, named HLA/GO (hybrid linear analysis in the literature), was applied to FTIR spectral data to predict Sudan dye concentration. The calibration and validation sets were designed to evaluate the performance of the multivariate method. The obtained results had a high determination coefficient (R2) of 0.98 and low root mean square error (RMSE) of 0.026% for the calibration set, and an R2 of 0.97 and RMSE of 0.05% for the validation set. The model was further validated using a second validation set and through the figures of merit, such as sensitivity, selectivity, and limits of detection and quantification. The proposed technique of FTIR combined with HLA/GO is rapid, simple and low cost, making this approach advantageous when compared with the main alternative methods based on liquid chromatography (LC) techniques.

Global trends in use of long-acting reversible and permanent methods of contraception: Seeking a balance.

The global trend shows that the use of permanent contraception to prevent unintended pregnancy is high. Although the trend also shows a rise in the use of long-acting reversible methods, these are still underutilized despite having contraceptive as well as non-contraceptive benefits. Lack of knowledge among women, dependence on the provider for information, and provider bias for permanent contraception are cited as reasons for this reduced uptake. Training of healthcare providers and increased patient awareness about the effectiveness of long-acting reversible contraceptive methods will increase their uptake and help prevent unintended pregnancies.

Silibinin ameliorates LPS-induced memory deficits in experimental animals.

Neuroinflammation is considered as one of the predisposing factor in the etiology of several neurodegenerative disorders. Therefore, the objective of the present study was to evaluate the protective effect of silibinin (SIL) in the lipopolysaccharide (LPS)-induced neuroinflammatory model. The effect of SIL on memory function was also evaluated on normal rats without LPS administration. In the first experiment, male rats were divided into five groups. Except control group animals, all rats received bilateral intracerebroventricular injection of LPS (5 µg/5 µl) into lateral ventricles on the first day of the experimental schedule. Control rats received bilateral intracerebroventricular injection of artificial cerebrospinal fluid into lateral ventricles. SIL in doses of 50, 100 and 200 mg/kg, p.o. was administered 1h before LPS injection and continued for 7 days. On Day-7, SIL attenuated the LPS-induced long-term and working memory loss in elevated plus and Y-maze test respectively. Further, SIL dose-dependently attenuated LPS-induced decrease in acetylcholine level and increase in the acetylcholinestrase activity in hippocampus and pre-frontal cortex. SIL ameliorated LPS-induced decrease in the mitochondrial complex activity (I, IV and V) and integrity, increase in lipid peroxidation and decrease in the activity of superoxide dismutase in both the brain regions. SIL attenuated amyloidogenesis in the hippocampus, while it decreased the LPS-induced increase in the level of NFκB in the pre-frontal cortex. In another study, SIL dose-dependently, enhanced memory functions in the normal rats, indicating its nootropic activity. Hence, SIL could be a potential candidate in the management of neuroinflammation-related memory disorders.

Impact of structured counseling on the selection of hormonal contraceptive methods: results of a multi-centric, observational study in India.

OBJECTIVE: To determine the influence of "structured contraception counseling" on Indian women's selection of contraceptive methods. METHODS: Women (≥18 and ≤40 years) requesting contraception were enrolled at 36 sites. "Structured contraception counseling" was provided by a health care professional on the available contraceptive methods. Questionnaires on the women's pre- and post-counseling contraceptive choice, her perceptions, and the reasons behind her post-counseling decision were filled. RESULTS: Significant reductions were observed in the proportion of women who were indecisive (n = 260; 31.5 % pre-counseling vs. n = 30; 3.6 %, post-counseling [P < 0.001]) and women opting for non-hormonal method (24.6 % pre-counseling vs. 6.8 % post-counseling, [P < 0.001]). Of all the women counseled (n = 825), 89.6 % (739/825) of women chose a hormonal contraceptive method. There were significant difference (P < 0.001) in the women's choice of contraceptive in the pre- and post-counseling sessions, respectively (combined oral contraceptive: 30.8 vs. 40.7 %; vaginal ring: 1.8 vs. 14.1 %; progestogen only pills: 1.6 vs. 7.9 %; injectable-depot medroxyprogesterone acetate: 5.9 vs. 13.6 %; levonorgestrel-intrauterine system: 3.8 vs. 13.3 %). CONCLUSIONS: Structured contraception counseling using standardized protocol and aids resulted in a significant increase in the selection of modern contraceptive methods. Post-counseling majority of women opted for hormonal methods with an increase in selection of pills and newer alternatives.

High energy Compton scattering study of TiC and TiN.

We present the experimental Compton profiles of TiC and TiN using 661.65 keV γ-ray from 20 Ci (137)Cs source. To explain our experimental data on momentum densities, we have computed the theoretical profiles, energy bands and density of states using linear combination of atomic orbitals scheme within the framework of density functional theory. In addition the energy bands, density of states and Fermi surfaces using full potential linearised augmented plane wave method have also been computed. Energy bands and density of states obtained from both the theoretical models show metallic character of TiC and TiN. The anisotropies in Compton line shapes and the Fermi surface topology are discussed in term of energy bands.