Evaluation of Physicochemical Changes in Hard-Boiled Eggs Stored at Different Temperatures.

Imaging human brown adipose tissue under room temperature conditions with 11C-MRB, a selective norepinephrine transporter PET ligand

The complete destruction of separate mixtures of 1.1 mM 4-chlorophenol (aqueous) and 0.61 mM pentachlorophenol (aqueous slurry) take place in the presence of 0.5 g of iron particles in 10 mL of 0.32 mM ethylenediaminetetraacetic acid (EDTA) under ambient air under room temperature conditions. Under this reaction condition, the time required to reach complete disappearance to the detection limit of GC-FID for each compound was 4 h for 4-chlorophenol and 70 h for pentachlorophenol. Electrospray ionization mass spectral (ESI-MS) analysis of the 4-chlorophenol reaction mixture after its complete disappearance indicated non-chlorinated, primarily low molecular weight products; however, Cl- from 4-chlorophenol was not detected due to adsorption onto the iron or its corrosion products. Radical trap and control experiments suggest that the mechanism for destruction initiates with dioxygen activation, leading to the formation of reactive oxygen species (ROS) and ultimately ring opening of the phenolic compounds. This is the first example of an abiotic system capable of the complete destruction of an organic pollutant under room temperature and pressure conditions through dioxygen activation chemistry.

Objective: The aim of this study was to determine the thermal effects of diode laser irradiation on titanium implants. Methods: An implant (3.5 × 11 mm) was placed into a bovine bone block. A three-wall intrabony defect was created to simulate peri-implant defect. Two thermocouples were secured to the apical and coronal surfaces to measure temperature changes (ΔT) during irradiation. The block was placed in a 37°C water bath and at room temperature (21°C). The defect was irradiated with different diode lasers (fiber 300 μm), while the coronal part of the implant was slightly emerging from the water. While the laser tip was positioned parallel to the implant, the defect was irradiated for 30 sec at 2 W in continuous and pulsed mode. Twenty laser irradiations were performed for each laser wavelength for assessment of ΔT. The linear mixed model was used for comparative statistics. Results: The 980 nm pulsed laser resulted in the highest ΔT (°C) at the coronal (22.45 ± 2.1/14.15 ± 0.13) and apical level (5.4 ± 0.56/3.56 ± 0.35) when this laser was used in both room temperature and water bath conditions, respectively. Similarly, highest ΔT (p < 0.0001) for the 810 nm was 14.3 ± 1.6/12.51 ± 0.63 and apical 3.42 ± 0.52/2.58 ± 0.25, for the 970 nm was 13 ± 1.4/9.93 ± 0.47 and apical 2.89 ± 0.19/2.01 ± 0.19 compared to the 940 nm laser coronally 10.1 ± 0.6/9.19 ± 0.35 and apically 1.67 ± 0.34/1.80 ± 0.17. The coronal part of the implant surpassed the critical threshold of 10°C when irradiated with each of the lasers in the room temperature conditions. Conclusions: Within the limitations of the study, the 940 nm laser seems to control better the risks of overheating during implant irradiation.

Bioink is a fundamental component of three-dimensional (3D) printing technology, exerting a direct influence on the overall quality, precision, and structural integrity of printed biological constructs. Among various factors influencing printing outcomes, printability is a key determinant for success, as it impacts the precision of printed structures, the consistency of filament formation, and the ability to maintain the correct shape throughout the printing process. The printability of bioink is influenced not only by its composition but also by external conditions, particularly the storage temperature. Therefore, evaluating the impact of storage temperature on bioink printability is essential. This paper presents the evaluation of the effects of three different storage temperature conditions on the printability of gelatin-alginate B-GA bioink over a period of 21 days. These conditions included freezing at -20 ± 1°C, refrigeration at 4 ± 1°C and storage at room temperature of 25 ± 2°C. The printability was assessed by examining various parameters, including the state of the bioink, the ability to form continuous filaments, the uniformity factor (U), the diffusion rate (Df) and the effectiveness of pore formation (Pr). The results showed that the printability of B-GA bioink remained stable during the first 14 days under all three tested storage conditions. However, after 21 days, a significant decline in printability was observed in the cases of freezing and room temperature conditions, proven by the decrease in Pr values of 0.8469 ± 0.0056 and 0.8630 ± 0.0074, respectively. In contrast, refrigeration at 4 ± 1°C allowed the B-GA bioink to retain its printability consistently throughout the entire 21-day period, with a Pr value of 0.908 ± 0.0227. Therefore, in the test, storing B-GA bioink at 4 ± 1°C was the most effective condition for preserving its printability over 21 days.

Reversibility of membrane performance and structure changes caused by extreme cold water temperature and elevated conditioning water temperature

This study investigated the influence of room temperature on the final prototype parts produced using the fused deposition modeling (FDM) technique. Real-time room temperature data was collected using a wireless sensor with a time series data collection method. A data-driven model called Long Short-Term Memory (LSTM) network was developed to predict room temperature. The model was trained using data from the wireless sensors collected during the experimental procedure, which involved printing prototype parts in different seasons of the year. The developed LSTM network demonstrated its capability to accurately predict temperature, enabling the detection of printing defects under various room temperature conditions. The study revealed that lower room temperatures had a more significant impact on the surface roughness of the printed parts compared to higher room temperatures. The effectiveness of the developed model was confirmed by comparing its results with the experimental data using Root Mean Square Error (RMSE). The developed LSTM model found an RMSE of 0.003993 for predicting cold room temperature data and an RMSE of 0.033993 for predicting hot temperature data. The developed LSTM model offers a valuable tool for detecting printing defects in different room temperature conditions. It provides users with information about the room temperature necessary for printing high-quality parts, thereby enhancing the printing process capability and minimizing defect issues in the printed parts.

The paper deals with the statistical study of the structural changes in the local labour market. It has been pointed out that one of the basic statistical study of the complex socio-economic systems, which is considered the local labour market are structural dynamic changes. It is caused by the structure which always has a certain mobility and ability to change under the influence of the internal and external factors. Therefore, in the study the analysis was carried out to identify the trends of local labour market functioning, as well as to assess the summary characteristics of the structural differences in the dynamics. It has been grounded that the functioning of the local labour market in the whole is characterized by certain structural and dynamic changes which can be estimated on the bases of measurements of total and current local labour market by using indicators of labour market statistics. The most common indicators include linear coefficient of absolute structural changes, the average coefficient of absolute structural changes, the average coefficient of relative structural changes, the integral coefficient of structural changes of Gateva, a general indicator of structural changes of Salai. Despite the complexity and diversity of the processes the most relevant study is that one that analyze the dynamics of economically active population number by gender, number of employed population by gender, number of vacancies by type of economic activity. The constant monitoring of indicators of labour market statistics makes it possible to optimize the activity of local governments involved in planning and monitoring the implementation of the decisions taken to promote employment, reduce unemployment, to balance and improve the effectiveness of management decisions

The long-wave infrared (LWIR) band holds critical value in applications such as industrial monitoring, biomedical imaging, and spectral analysis. However, frequency conversion for wavelengths above 5 μm, which covers the core LWIR spectral range, remains challenging due to the limited effective nonlinear coefficients of most optical crystals and severe absorption losses in the mid-infrared to LWIR region, restricting the efficiency of upconversion processes. Meanwhile, mainstream commercial mercury cadmium telluride (HgCdTe) detectors typically require cryogenic operation to achieve high signal-to-noise ratios (SNRs), coupled with high fabrication costs, which severely hinders their widespread deployment under room-temperature conditions. This paper presents a room-temperature LWIR detection device based on frequency upconversion technology, which enables high-sensitivity detection across a broad spectral range (7.5-9 μm) without the need for cooling. Experimental results demonstrate that the system achieves a minimum detectable energy at the fJ level under nanosecond-pulse operation, along with excellent wavelength stability and high responsivity. Compared with typical commercial HgCdTe detectors, the proposed device exhibits a sensitivity improvement of up to approximately 2.4 orders of magnitude at room temperature, significantly enhancing detection accuracy and signal-to-noise ratio for LWIR signals under room temperature conditions. This work provides an effective technical pathway toward the development of room-temperature, low-cost, and high-performance LWIR detection systems, showing promising potential for applications in real-time monitoring, portable sensing, and spectroscopic analysis.

Triazine formation in cyanate-based resin systems at room temperature conditions

Thermal comfort and self-reported productivity in an office with ceiling fans in the tropics

Modelling the transport phenomena and texture changes of chicken breast meat during the roasting in a convective oven

Entomophagy or consumption of insects has significantly increased worldwide, either for pleasure or to satisfy the food needs in developing countries. There are approximately 2,000 species of edible insects distributed in 120 countries. From these 2,000 species, about 540 are located in Mexico; one of the most consumed are the escamoles. Escamoles are larvae and pupae of the ant Liometopum apiculatum. Escamoles are nutritious because of their high content of protein, fat, carbohydrates and vitamin. However, during storage the quality of escamoles changes rapidly which affects the acceptability by the consumer. This loss of quality is probably a result of proteolytic activity of endogenous proteases. Therefore, the objectives of this study were to identify the classes of proteases in escamoles as well as to evaluate the effect of proteolytic activity on physicochemical and structural changes during storage. Proteases identification was conducted using specific inhibitors; structural changes, texture, and proteolytic activity were monitored at different days of storage. The highest proteolytic activities (P&lt;0.05) were observed at pH 8, 9 and 10 and at 37 and 50 °C. Proteases were mainly inhibited by iodoacetic acid and soybean trypsin inhibitor showing that cysteine and serine proteases were dominant. High proteolytic activity, significant (P&lt;0.05) reduction in texture and weight loss was observed during storage. The deterioration of escamoles was evident in analyses of images, where initial structure was lost during storage. These results indicate that different groups of proteases are associated with rapid deterioration of escamoles.

Irradiation of metal materials with low-energy ions is accompanied by the long-range effect, consisting in distinct texture and structure changes at the depth, exceeding, at least, by 104 times the thickness of the layer of ion retardation. In order to ascertain mechanisms of this effect, a layer-by-layer X-ray study was carried out as applied to ion-plasma treated cladding tubes of Zr- 1%Nb alloy for nuclear reactors. Impacts of pulse treatments with helium plasma by two different regimes and the ion energy of ~ 1 keV were compared. It was found, that only by minimal surface melting the ion-plasma treatment causes unpredictable bulk texture changes, consisting in arising of the axial texture component. The melted surface layer suppresses shock waves, associated with braking of ions and supposedly responsible for stimulation of dislocation processes at long distances from the surface.

Carbon nanotubes (CNTs) offer interesting applications in nanotechnology, biochemistry, biomedicine, catalysis, electronics, optoelectronics, electrochemistry, and sensor technologies. They could also be used as a filler for metallic nanoparticle composites prepared at elevated temperatures by sintering. In the present work the oxidized multiwall carbon nanotubes (ox‐MWCNTs) are investigated. The aim is their characterization after oxidation reaction, investigation of their temperature stability and the influence of temperature modification on the structural and chemical changes in the atomic bonding state during annealing. The ox‐MWCNTs are studied in the temperature range from RT (25 °C) to 150 °C by X‐ray photoelectron spectroscopy (XPS), X‐ray induced Auger electron spectroscopy (XAES), elastic peak electron spectroscopy (EPES), quadrupole mass spectroscopy (QMS), transmission electron microscopy (TEM), Fourier transform infra‐red spectroscopy (FTIR) methods. The FTIR and XPS results indicate the presence of water, carboxyl, hydroxyl, carbonyl, ester, and acid anhydride groups in the bulk and at the surface. Annealing decreases the oxygen content (from 12.4 to 9.8 at.%), accompanied by increasing amount of C sp2 groups (from 63 to 74%), indicating the reconstruction of C bonds. For the applied temperature range increasing content of water is observed, whereas decreasing content of other carbon–oxygen groups, i.e., carbonyl, carboxyl, hydroxyl, ester, and acid anhydride. This decrease undergoes with different rate. The QMS at 150 °C showing the largest contribution of CO2, indicates major desorption of oxygen groups from the edges of ox‐MWCNTs, whereas desorption of oxygen from the bridges visible as CO is minor. The surface structural changes in EPES spectra at the temperature of 150 °C confirm increasing surface imperfection. The proposed method of chemical oxidation also results in significant elimination of amorphous carbon and metallic residues from as prepared MWCNTs.magnified image The TEM image of ox‐MWCNTs.

In the present years, nanobiotechnology has to turn out to be an important division of research. Here, this work reported a novel Mikania micrantha leaf extract‐mediated silver nanoparticle (AgNP) under room temperature condition. The biosynthesised AgNPs were further characterised by various analysis techniques such as ultraviolet–visible spectrophotometer, Fourier transform infrared spectroscopy (FT‐IR), X‐ray diffraction (XRD) and transmission electron microscope (TEM) energy‐dispersive X‐ray spectroscopy. The formation of AgNPs was confirmed by XRD spectrum which displayed intense peaks corresponding to the (1 1 1), (2 0 0), (2 2 0) and (3 1 1) lattice planes of Ag. The plant extracts stirred with Ag nitrate solution gradually changes its colour from light yellow to dark brown. The biogenic AgNPs were mostly spherical in shape with varying sizes ranging from 5 to 20 nm, as evident by TEM analysis. FT‐IR spectra of the extract revealed the presence of amide I and amide II bonds of the proteins. The synthesised AgNPs showed excellent activity results against various Gram‐positive and Gram‐negative bacterial strains.