Physical Properties Research Articles

Contamination with Proteus and Staphylococcus spp. Effect on Physical Properties of Sheep Semen

Contamination with Proteus and Staphylococcus spp. Effect on Physical Properties of Sheep Semen

A Classroom Intervention of Enhancing Namibian Preservice Science Teachers’ Conceptual Understanding of Properties of Waves Through Mnemonics

This quantitative classroom intervention study investigated the effectiveness of using mnemonics to enhance preservice teachers’ conceptual understanding of the topic of wave properties in physics. The study involved a sample of 30 final-year undergraduate preservice teachers enrolled in the Bachelor of Education Honours, Senior Primary with specializations in Natural Science and Health Education at Dorado Campus of The International University of Management in Namibia. The primary objective was to assess the impact of a targeted mnemonic-based instructional intervention on their ability to comprehend and apply key physics concepts related to wave properties. Initially, participants’ baseline understanding of these concepts was evaluated through pre-intervention assessments, which provided a measure of their existing knowledge. A structured mnemonic-based teaching intervention was then implemented over a specified period, designed to facilitate improved understanding of wave properties. Following the intervention, post-assessment evaluations were conducted to compare and measure changes in the participants’ conceptual understanding of the subject matter. This comparative analysis aimed to identify any significant improvements resulting from the mnemonic-based instruction. The findings indicated that there were notable improvements in the participants’ conceptual grasp of wave properties after the mnemonic-based intervention. Additionally, the study collected and analyzed participants’ feedback regarding the use of mnemonics, offering insights into their perceptions of the technique’s effectiveness as a pedagogical tool for learning complex scientific concepts. This research contributes to the broader field of physics concepts by providing evidence-based strategies to enhance the preparation of preservice teachers, particularly in physics education. Ultimately, the results of this study have the potential to inform and improve teaching practices, fostering more effective and engaging educational experiences in future science classrooms.

Synthesis and Polymerization of Poly Acryl Imide and One of Their Derivatives Then Curing the Product with Alkyl Halide

The present work involved four steps: First step include reaction of acrylamide ,N-?-Methylen-bis(acryl amide) and N-tert Butyl acryl amide with poly acryloyl chloride in the presence of triethyl amine (Et3N) as catalyst, the second step include homopolymerization of all products of the first step by using benzoyl peroxide(BPO) as initiator in (80-90)Co in the presence of Nitrogen gas(N2). In the third step the poly acrylimide which prepare in second step was convert into potassium salt by using alcoholic potassium hydroxide solution. Fourth step include Alkylation of the prepared polymeric salts in third step by react it with different alkyl halides(benzyl chloride, allylbromide , methyl iodide) by using DMF as solvent for(10-12) hours. Structure Confirmation of all prepared polymers were proved using FT-IR, 1H-NMR and C13-NMR spectroscopy for some polymers. Other physical properties including softening and melting points of the polymers were also measured.

Magnetosomes as Potential Nanocarriers for Cancer Treatment.

Magnetotactic bacteria (MTBs) and their organelles, magnetosomes, are intriguing options that might fulfill the criteria of using bacterial magnetosomes (BMs). The ferromagnetic crystals contained in BMs can condition the magnetotaxis of MTBs, which is common in water storage facilities. This review provides an overview of the feasibility of using MTBs and BMs as nanocarriers in cancer treatment. More evidence suggests that MTBs and BMs can be used as natural nanocarriers for conventional anticancer medicines, antibodies, vaccine DNA, and siRNA. In addition to improving the stability of chemotherapeutics, their usage as transporters opens the possibilities for the targeted delivery of single ligands or combinations of ligands to malignant tumors. Magnetosome magnetite crystals are different from chemically made magnetite nanoparticles (NPs) because they are strong single-magnetic domains that stay magnetized even at room temperature. They also have a narrow size range and a uniform crystal morphology. These chemical and physical properties are essential for their usage in biotechnology and nanomedicine. Bioremediation, cell separation, DNA or antigen regeneration, therapeutic agents, enzyme immobilization, magnetic hyperthermia, and contrast enhancement of magnetic resonance are just a few examples of the many uses for magnetite-producing MTB, magnetite magnetosomes, and magnetosome magnetite crystals. From 2004 to 2022, data mining of the Scopus and Web of Science databases showed that most research using magnetite from MTB was carried out for biological reasons, such as in magnetic hyperthermia and drug delivery.

Production and Evaluation of Peanut Butter Prepared with Peanut Shells

Background:: Innovative application of processing is an emerging trend in food production. Objective:: The present study was conducted to produce peanut butter and evaluate the physical, chemical, and sensory properties of the product, to which the outer shells of peanuts were added in different proportions (5, 10, 15%) to reduce the calories of the product by reducing the fat content in the peanut butter as well as benefiting from the shells as a residue secondary to the peanut seeds. Methods:: The chemical composition of the prepared sample, along with bioactive determination Using HPLC, microbial testing, Aflatoxin content, and sensory evaluation, have been done for the prepared peanut butter using standard methods. Results:: The chemical composition of the peanut outer shell powder was characterized by the highest value of fiber (46.6%), followed by total carbohydrates and protein (23.25%, (12.54%) respectively. The produced peanut butter showed that the total carbohydrate resulted in the highest value (23.25%), followed by fat (42.21) and protein (28.12%). Substitution at 5, 10, and 15% peanut outer shell resulted in a non-significant difference concerning protein. At the same time, the lipid content showed a significant decrease compared to the control. A similar trend was found concerning total carbohydrate-to-fat content. Total fiber increased to 1.5 & 2.08, and 2.6 times as high as the content parallel to dietary fiber, while β-Carotene decreased significantly due to the substitution level. The substitution level decreased energy (cal) by about 203.58, 730.093, 562.86, 545.19, and 526.66, respectively, compared with the control. A slight increase was found in the mineral content due to the substitution, except for the calcium increases at 15%. DPPH and ABTS% increased in parallel with the substitution level, which was in line with total phenols and flavonoids. Flavonoid fraction resulted in nariagin (94.72 QE), the major flavonoid, followed by lutein (82.23 QE). Meanwhile, phenolic compounds were described with pyrogallol (68.31 GAE) (as the main compound, followed by chlorogenic (780.76 GAE). The fatty acid composition showed that oleic and linoleic were predominant in all treatments. Bacterial, yeast, and mold counts appeared after three months of storage (20 ± 2°C). Aflatoxin was not detectable in the sample of the peanut outer shells and peanut butter samples. Sensory characteristics showed approximately the same score for all treatments except that of 15% substitution, which resulted in a significant decrease in all parameters compared with the control. Conclusion:: This study reported that 5%, followed by 10% of peanut outer shells, were the most suitable levels for making peanut butter, improving the nutritional value by increasing the percentage of fiber and antioxidants in peanut shells, leading to better quality products and shelf life.

Studying the effect of irrigation water quality (fresh water, treated water and wastewater) on some soil physical and chemical proper-ties and the protein content in the paulownia leaves.

Samples of soil irrigated with three types of water: Fresh water (F), wastewater (W), fresh water and wastewater (F1W1, alternative irrigation) were collected at two depths (0-15 cm and 15-30 cm) for two consecutive years. The bulk density, true density, soil total porosity, electrical conductivity, pH, percentage of organic matter, and concentration of phosphorus and potassium were measured. In addition, the length and circumference of paulownia tree trunk were measured, and the protein content of dry and green leaves was estimated. The results showed the differences in the apparent density values, as wastewater irrigation decreases the apparent density and increased the soil total porosity. The results also indicated that there were significant differences in the soil PH between the three treatments, as treated water irrigation decreased the pH and insignificantly increased the soil electrical conductivity. However, there were significant differences when irrigating with wastewater, as the electrical conductivity and organic matter content increased in the soil irrigated with wastewater compared to soil irrigated with fresh water at two depths (0-15cm and 15-30cm). Moreover, the concentrations of phosphorus and potassium increased in the soil irrigated with wastewater and treated water compared to fresh water. Furthermore, there were significant differences in the height of paulownia tree and its trunk circumference when irrigating with treated water compared to wastewater and fresh water. As for the protein content in paulownia leaves, it was observed that there were significant differences when irrigating with wastewater compared to treated water and fresh water. There was high protein content in the dry and green leaves when irrigating with the three types of water, but the highest protein content was for wastewater irrigation.

Studying the Effect of Material and Geometry on Perceptual Outdoor Illumination.

Understanding and modeling perceived properties of sky-dome illumination is an important but challenging problem due to the interplay of several factors such as the materials and geometries of the objects present in the scene being observed. Existing models of sky-dome illumination focus on the physical properties of the sky. However, these parametric models often do not align well with the properties perceived by a human observer. In this work, drawing inspiration from the Hosek-Wilkie sky-dome model, we investigate the perceptual properties of outdoor illumination. For this purpose, we perform a large-scale user study via crowdsourcing to collect a dataset of perceived illumination properties (scattering, glare, and brightness) for different combinations of geometries and materials under a variety of outdoor illuminations, totaling 5,000 distinct images. We perform a thorough statistical analysis of the collected data which reveals several interesting effects. For instance, our analysis shows that when there are objects in the scene made of rough materials, the perceived scattering of the sky increases. Furthermore, we utilize our extensive collection of images and their corresponding perceptual attributes to train a predictor. This predictor, when provided with a single image as input, generates an estimation of perceived illumination properties that align with human perceptual judgments. Accurately estimating perceived illumination properties can greatly enhance the overall quality of integrating virtual objects into real scene photographs. Consequently, we showcase various applications of our predictor. For instance, we demonstrate its utility as a luminance editing tool for showcasing virtual objects in outdoor scenes.

Investigation the Effect of Thermal Agent on Physical Properties of PVC-PVA Blended

في هذه الدراسة , الخصائص البصرية لبولي فنيل كلورايد (PVC) و بولي فنيل الكحول (PVA) واغشية الخلائط بولي فنيل الكحول – بولي فنيل كلورايد الثنائية بتراكيز مختلفة (PVA75% + PVC25%, PVA50% + PVC50%, and PVA25% + PVC 75%) قد تم فحصها بالنسبه لدرجات الحرارة مختلفة (25, 120, 140) درجة سليزية لمدة ساعه واحدة. لقد تم تحضير اغشية الخلائط لبولي فنيل الكحول – بولي فنيل كلورايد الثنائية باستخدام طريقة الصب. مطيافية الاشعة المرئية–فوق البنفسجية سوف تستخدم لتعيين الخصائص البصرية لهذه الاغشية في مدى اطوال الموجية (200-900) نانومتر مثل النفاذية و امتصاصية ومعامل امتصاص و فجوة الطاقة وكذلك تأثير درجة الحرارة على هذه المعاملات. النتائج التى تم الحصول عليها من الجزء العملي تشير بان الامتصاصية ومعامل الامتصاص لخلائط بولي فنيل الكحول – بولي فنيل كلورايد الثنائية سوف تزداد مع زيادة تركيز بولي فنيل الكحول. فجوة الطاقة لخلائط بولي فنيل الكحول – بولي فنيل كلورايد الثنائية بتراكيز مختلفة سوف تقل مع زيادة تركيز بولي فنيل الكحول. يتميزنسبة الخليط الثنائي PVA 75%+ PVC25% بخصائص بصرية مناسبة للغايه. امتصاصية و معامل امتصاص لخلائط بولي فنيل الكحول – بولي فنيل كلورايد الثنائية سوف تزداد مع زيادة درجة الحراره في حين فجوة الطاقة والنفاذية لخلائط بولي فنيل الكحول – بولي فنيل كلورايد الثنائيه سوف تقل مع زيادة درجة الحرارة. طبيعة الأنتقالات الالكترونية لخلائط بولي فنيل الكحول – بولي فنيل كلورايد الثنائية بتراكيز مختلفة قبل و بعد تعرض للدرجات الحرارة هي غير مباشرة. من النتائج العلمية التي تم الحصول عليها يمكن الاستنتاج ان الامتصاصية و معامل الامتصاص لخلائط بولي فنيل الكحول – بولي فنيل كلورايد الثنائية هي أفضل من البوليمرات بولي فنيل الكحول وبولي فنيل كلورايد النقية. الخصائص البصرية لأغشية الخلائط بولي فنيل الكحول – بولي فنيل كلورايد الثنائية سوف تتأثر بتعرض الى درجات الحرارة.

A Review on the Driving Forces in the Formation of Bioactive Molecules-Loaded Prolamin-Based Particles.

Prolamin-based particles loaded with bioactive molecules have attracted widespread attention from scientists due to their novel properties in chemistry, physics, and biology. In the self-assembly process of biopolymer-based nanocapsules, noncovalent interactions are the main driving forces for reducing bulk materials to the nanoscale and controlling the release of bioactive molecules. This article reviews the types of interaction forces, binding strength, binding active sites, molecular orientation, and binding affinity that affect the release profile of bioactive molecules during the preparation of protein stabilizer particles. Different preparation formulations, the use of different biopolymers, the inherent nature of the loaded bioactive molecules, and external factors (including pH, biopolymer concentration, temperature, salt, ultrasonication, and atmospheric cold plasma treatment) lead to different types and strengths of intra- and intermolecular interactions. Strategies, such as pH, ultrasonication, and atmospheric cold plasma, to change the protein conformation are key to improving the binding strength between proteins and bioactive substances or stabilizers. This review provides some guidance for scientists and technicians dedicated to improving loading efficiency, delaying release, enhancing colloidal stability, and exploring the binding behavior among proteins, stabilizers, and bioactive molecules.

Custom Shoe Sole Design and Modeling Toward 3D Printing.

This study introduces a design procedure for improving an individual’s footwear comfort with body weight index and activity requirements by customized three-dimensional (3D)-printed shoe midsole lattice structure. This method guides the selection of customized 3D-printed fabrications incorporating both physical and geometrical properties that meet user demands. The analysis of the lattice effects on minimizing the stress on plantar pressure was performed by initially creating various shoe midsole lattice structures designed. An appropriate common 3D printable material was selected along with validating its viscoelastic properties using finite element analysis. The lattice structure designs were analyzed under various loading conditions to investigate the suitability of the method in fabricating a customized 3D-printed shoe midsole based on the individual’s specifications using a single material with minimum cost, time, and material use.

Collagen as Bioink for Bioprinting: A Comprehensive Review.

Biomaterials made using collagen are successfully used as a three-dimensional (3D) substrate for cell culture and considered to be promising scaffolds for creating artificial tissues. An important task that arises for engineering such materials is the simulation of physical and morphological properties of tissues, which must be restored or replaced. Modern additive technologies, including 3D bioprinting, can be applied to successfully solve this task. This review provides the latest evidence on advances of 3D bioprinting with collagen in the field of tissue engineering. It contains modern approaches for printing pure collagen bioinks consisting only of collagen and cells, as well as the obtained results from the use of pure collagen bioinks in different fields of tissue engineering.

Estimation of Physical and Electrical Properties of Various REBCO Tapes for Construction of Very-High-Field REBCO Magnet

Estimation of Physical and Electrical Properties of Various REBCO Tapes for Construction of Very-High-Field REBCO Magnet

Zinc Acetate in Organic Synthesis and Catalysis: A Review

Abstract: Among the many zinc salts that can be found, zinc acetate is one of the readily available, affordable, low-hazardous Lewis acids. It can be referred to as a multifunctional catalyst due to its unique physical and chemical properties, which show that they are effective in enabling a variety of synthetic transformations in both organic synthesis and catalysis. This review included noteworthy innovations that have been created during the past two and half decades using zinc acetate as a catalyst or reagent.

MPMNet: A Data-Driven MPM Framework for Dynamic Fluid-Solid Interaction.

High-accuracy, high-efficiency physics-based fluid-solid interaction is essential for reality modeling and computer animation in online games or real-time Virtual Reality (VR) systems. However, the large-scale simulation of incompressible fluid and its interaction with the surrounding solid environment is either time-consuming or suffering from the reduced time/space resolution due to the complicated iterative nature pertinent to numerical computations of involved Partial Differential Equations (PDEs). In recent years, we have witnessed significant growth in exploring a different, alternative data-driven approach to addressing some of the existing technical challenges in conventional model-centric graphics and animation methods. This article showcases some of our exploratory efforts in this direction. One technical concern of our research is to address the central key challenge of how to best construct the numerical solver effectively and how to best integrate spatiotemporal/dimensional neural networks with the available MPM's pressure solvers. In particular, we devise the MPMNet, a hybrid data-driven framework supporting the popular and powerful MPM, to combine the comprehensive properties of MPM in numerically handling physical behaviors ranging from fluid to deformable solids and the high efficiency of data-driven models. At the architectural level, our MPMNet comprises three primary components: A data processing module to describe the physical properties by way of the input fields; A deep neural network group to learn the spatiotemporal features; And an iterative refinement process to continue to reduce possible numerical errors. The goal of these special technical developments is to aim at involved numerical acceleration while preserving physical accuracy, realizing efficient and accurate fluid-solid interactions in a data-driven fashion. The extensive experimental results verify that our MPMNet can tremendously speed up the computation compared with the popular numerical methods as the complexity of interaction scenes increases while better retaining the numerical accuracy.

The use of D-Optimal Mixture Design in the development of date stone and spirulina tablet formulation as a phycocyanin dietary supplement

The aim of this work is in the formulation of a dietary supplement, combining spirulina and date stone benefits. For this, a study was done on these two ingredients by determining their approximate composition and antioxidant potential. Following this, we used a statistical method to determine the appropriate proportions of ingredients to obtain a tablet with optimal physical properties. After setting these parameters, we analysed this tablet’s composition and effectiveness by evaluating its physicochemical properties, antioxidant potential, FTIR spectrum and studied the controlled release of phycocyanin. Our results revealed that the optimized formula showed high stability and richness in active compounds.

Transformer-Based Neural-Network Quantum State Method for Electronic Band Structures of Real Solids.

Recent advancements in neural networks have led to significant progress in addressing many-body electron correlations in small molecules and various physical models. In this work, we propose QiankunNet-Solid, which incorporates periodic boundary conditions into the neural network quantum state (NNQS) framework based on generative Transformer architecture along with a batched autoregressive sampling (BAS) method, enabling the effective ab initio calculation of real solid materials. The accuracy of this method is demonstrated in one-, two-, and three-dimensional periodic systems, with results comparable to those of full configuration interaction and coupled-cluster method, even in the strongly correlated regime. Furthermore, we compute the band structures and density of states for silicon crystal. The successful incorporation of periodic boundary conditions into the NNQS framework through QiankunNet-Solid opens up new possibilities for the accurate and efficient study of electronic structure properties in solid-state physics.

Quinoline Derivatives as Promising Scaffolds for Antitubercular Activity: A Comprehensive Review.

Heterocyclic compounds and their derivatives play a significant role in the design and development of novel quinoline drugs. Among the various pharmacologically active heterocyclic compounds, quinolines stand out as the most significant rings due to their broad pharmacological roles, specifically antitubercular activity, and their presence in plant-based compounds. Quinoline is also known as benzpyridine, benzopyridine, and 1-azanaphthalene. It has a benzene ring fused with a pyridine ring, and both rings share two carbon atoms. The importance of quinoline lies in its incorporation as a key component in various natural compounds found in medicinal plant families like Fumariaceae, Berberidaceae, Rutaceae, Papavaraceae, and others. This article is expected to have a significant impact on the advancement of effective antitubercular drugs. Through harnessing the potent activity of quinoline derivatives, the research aims to make valuable contributions to combating tuberculosis more efficiently and ultimately reducing the global burden of this infectious disease. Numerous nitrogen-containing heterocyclic compounds exhibit significant potential as antitubercular agents. These chemicals have fused aromatic nitrogen-heterocyclic nuclei that can change the number of electrons they have, which can change their chemical, physical, and biological properties. This versatility comes from their ability to bind with the receptors in multiple modes, a critical aspect of drug pharmacological screening. Among these compounds, quinoline stands out as it incorporates a stable fusion of a benzene ring with a pyridine nucleus. Quinolines have demonstrated a diverse range of pharmacological activities, including but not limited to anti-tubercular, anti-tumor, anticoagulant, anti-inflammatory, antioxidant, antiviral, antimalarial, anti-HIV, and antimicrobial effects. Some molecules, such as lone-paired nitrogen species, include pyrrole, pyrazole, and quinoline. These molecules contain nitrogen and take part in metabolic reactions with other molecules inside the cell. However, an excessive accumulation of reactive nitrogen species can lead to cytotoxicity, resulting in damage to essential biological macromolecules. Among these compounds, quinoline stands out as the oldest and most effective one, exhibiting a wide range of significant properties such as antitubercular, antimicrobial, anti-inflammatory, antioxidant, analgesic, and anticonvulsant activities. Notably, naturally occurring quinoline compounds, such as quinine, have proven to be potent antimalarial drugs. This review highlights quinoline derivatives' antitubercular potential, emphasizing recent research advancements. Utilizing IC50 values, the study emphasizes the efficacy of various quinoline substitutions, hybrids, and electron-withdrawing groups against MTB H37Rv. Continued research is essential for developing potent, low-toxicity quinoline derivatives to combat tuberculosis.

Molecular Players at the Sorting Stations of Malaria Parasite 'Plasmodium falciparum'.

The apicomplexan pathogenic parasite 'Plasmodium falciparum' (Pf) is responsible for most of the malaria related mortality. It resides in and refurbishes the infected red blood cells (iRBCs) for its own survival and to suffice its metabolic needs. Remodeling of host erythrocytes involves alteration of physical and biochemical properties of the membrane and genesis of new parasite induced structures within the iRBCs. The generated structures include knobs and solute ion channels on the erythrocyte surface and specialized organelles i.e. Maurer's clefts (MCs) in the iRBC cytosol. The above processes are mediated by exporting a large repertoire of proteins to the host cell, most of which are transported via MCs, the sorting stations in parasitized erythrocytes. Information about MC biogenesis and the molecules involved in maintaining MC architecture remains incompletely elucidated. Here, we have compiled a list of experimentally known MC resident proteins, several of which have roles in maintaining its architecture and function. Our short review covers available data on the domain organization, orthologues, topology and specific roles of these proteins. We highlight the current knowledge gaps in our understanding of MCs as crucial organelles involved in parasite biology and disease pathogenesis.

Microphase Separation Produces Interfacial Environment within Diblock Biomolecular Condensates.

The phase separation of intrinsically disordered proteins is emerging as an important mechanism for cellular organization. However, efforts to connect protein sequences to the physical properties of condensates, i.e., the molecular grammar, are hampered by a lack of effective approaches for probing high-resolution structural details. Using a combination of multiscale simulations and fluorescence lifetime imaging microscopy experiments, we systematically explored a series of systems consisting of diblock elastin-like polypeptides (ELP). The simulations succeeded in reproducing the variation of condensate stability upon amino acid substitution and revealed different microenvironments within a single condensate, which we verified with environmentally sensitive fluorophores. The interspersion of hydrophilic and hydrophobic residues and a lack of secondary structure formation result in an interfacial environment, which explains both the strong correlation between ELP condensate stability and interfacial hydrophobicity scales, as well as the prevalence of protein-water hydrogen bonds. Our study uncovers new mechanisms for condensate stability and organization that may be broadly applicable.

The structural and optical properties of PVA/CMC copolymer cured by UV irradiation for different times

Poly(vinyl alcohol) (PVA)/carboxymethylcellulose (CMC) blend films with equal amounts (0.25 g) of both polymers were prepared through a simple and low-cost comparative casting method. Then, the PVA/CMC blend films were exposed to ultraviolet (UV) radiation for varied time intervals (1, 12, 26, 32, 40 and 48 h). The UV-irradiation effect on the physical properties of as-prepared films, including the structure, morphology, composite and optical properties (transmittance, absorbance and band gap (E g)), was examined. Field-emission scanning electron microscopy images showed that UV irradiation had a strong effect on the shape of PVA/CMC blend films. The X-ray diffraction patterns showed various crystalline qualities in the microstructure of as-synthesized samples. The Fourier transform infrared spectra showed that the UV-irradiation time and CMC film had a positive impact on the blend polymer structure since covalent connections were formed between CMC and PVA. Furthermore, the analysis results of optical inspections showed that the absorbance of the PVA/CMC films improved with an increment in irradiation time from 1 to 40 h. Important tuning of the E g values of blend films was realized. It showed a slight increase from 4.64 to 4.84 eV with increasing irradiation time from 1 to 40 h. The E g value (3.21 eV), however, displayed an inverted behavior due to an increased irradiation time of 48 h. This reduction could be ascribed to the creation of defects inside the blend band gap. Finally, the physical property modification of PVA/CMC blend film using UV irradiation made it an amazing contender in the optoelectronic field.