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Polymer Electrolyte Membrane Fuel Cells (PEMFCs) operating in Dead-Ended Anode (DEA) mode present a promising alternative to traditional flow-through systems by simplifying design and reducing costs. However, their efficiency and durability are challenged by transient phenomena such as water accumulation, nitrogen buildup, and carbon corrosion throughout operation. This review investigates the dynamic behavior of DEA PEMFCs under dynamic operating states, aiming to improve their efficiency. By analyzing purge cycle optimization and transient response characteristics, we identify strategies to mitigate hydrogen loss, maintain voltage stability, and extend stack lifetime. The key findings indicate that precise purge scheduling and effective water management are critical for optimizing performance, with dynamic models providing insights into time-dependent processes. This study underscores the potential of DEA PEMFCs for high-efficiency applications provided transient effects are effectively managed.

The torsional deformation behavior of an elastic bar with a circular cross-section was investigated by applying invariant dyadic analysis, where the small finite displacement functions advocated by Saint-Venant (1855) were fully employed. It was found that the previously overlooked circumferential shear force field generated by pure torsion on the side walls of a bar produces an unusual torque term induced by the skew-symmetric part of the deformation tensor and exhibits quadratic length dependence along the z-axis of the bar. The adaptation of this torque term for a helical conformation of α-peptides creates moments acting on the circular cross-sections and is directed along the surface normal of circular cross-sections, which coincides with the tangent vector of the helix. The projection of this torque along the z-axis of the helix varies quadratically with the azimuthal angle. The radial component of the unusual torque, which also lies along the principal normal vector of the helix, starts to perform a precession motion by tracking a spiral orbit around the z-axis, whereas its apex angle decreases asymptotically with the azimuthal angle and finally reaches a finite value depending on the height of the helix along the z-axis. The ordinary torque terms, which are also deduced from the self- and anti-self-conjugate parts of the deformation tensor, have magnitudes half that of the full torque term reported in the literature. The present results were applied to the helical conformation of α-peptides designated by {3.611} to show that the mechanical stability of strained open-ended helical conformations can be successfully achieved by spontaneous readjustments of the surface and bulk Helmholtz free energies under isothermal isochoric conditions. It has been demonstrated that the main contribution to the mechanical stability of α-peptide 3.611 cannot come alone from the electrostatic dipole-dipole interaction potential of the anti-align excess dipole pairs but also from the surface Helmholtz free energy, which is characterized by a binding free energy of -15.5 eV/molecule (-32.56 Kcal/mole) for an alpha-peptide composed of 11 amino acid residues with a critical arc length of approximately 10 nm, assuming that the shear modulus is G = 1GPa and the surface Helmholtz specific free energy density is fs = 800 erg/cm2. This result was in excellent agreement with the experimental observations of the AH-1 conformation of (Glu)n Cys at pH 8. The present theory indicates that only two excess permanent anti-align dipole pairs for one α-Helical peptide molecule is requirement to stabilize the whole secondary structure of the protein that is exposed to heavy torsional deformation during the folding processes which amounts to 7.75 eV/molecule stored electrostatic energy compared to the interfacial Helmholtz free energy of -23.25 eV/molecule, which is exposed to hydrophobic environments.

Introduction: The medial collateral ligament (MCL), a primary stabilizer against valgus forces, often requires surgical intervention in severe injuries, especially when associated with anterior cruciate ligament (ACL) tears. However, MCL repair or reconstruction is typically reserved for patients who continue to experience persistent valgus instability after nonoperative management has failed. The use of synthetic and biological implants is increasingly popular to augment these procedures, providing both biomechanical reinforcement and promoting natural healing. BioBrace, a biocomposite of collagen and bioabsorbable microfilaments, provides structural support and enhances tissue healing. This article explores the surgical treatment of high-grade medial collateral ligament (MCL) injuries of the knee using BioBrace augmentation through a case series.Methods: Cohort of patients who underwent MCL repair surgery with a bioinductive membrane augmentation (BioBrace) between December 2023 and February 2024. This article presents surgical techniques, indications, and clinical outcomes from a case series, highlighting the benefits of BioBrace augmentation in improving stability and functional recovery. Results: A total of 4 patients underwent MCL repair surgery with BioBrace. Results show that patients experienced reduced instability, faster rehabilitation, and favorable outcomes without significant postoperative complications. Conclusion: This method offers a promising alternative for patients with complex knee injuries, especially athletes, by facilitating early rehabilitation and improving joint stability. Further research is recommended to evaluate long-term efficacy and optimize the surgical approach.

Introduction: Sophisticated technological advancements for the identification of people are readily available in developed countries.  Meanwhile, relatively less expensive algorithms in physical anthropometry could be employed for such identification purposes. Although such evaluations have been done in some countries, due to interpopulation variations, such relations should be ethnic-and sex-specific.  Aim: Therefore, the present study sought to assess the relationship between the long bones of the upper and lower limbs among two ethnic groups in Ghana for stature estimation. Methodology: Using a purposive non-random sampling technique, participants made up of 140 Asantes and 102 Ewes aged 20 to 25 years were recruited after an ethical approval was obtained from the Committee on Human Research, Publication and Ethics, KNUST.  Results: For the same sex, there was no statistically significant difference between Asantes and Ewes concerning height. The most useful parameters for stature estimation among the Asante males were left fibular and tibial lengths, with those of the females being left ulnar, fibular, and radial lengths.  However, for the Ewe males, the most significant parameters for height estimation were right fibular and humeral lengths, whereas for the Ewe females, being right tibial and humeral lengths.  Conclusion: Findings of the study are useful for the identification of humans with dismembered body parts involved in various disasters, such as automobile accidents.  The database and formulae derived would be useful for stature estimation needed in biological profiling and other assessments of bedridden patients.

Carazolol is a non-specific β-adrenargic reseptor blocking agent. It ıs structurally analogous to catecholamins, in that, when administered, it forms reversible bonds with β-adrenergic, however, induce adrenergic effects, and it inhibits the actions of the catecholamins in times of stres by saturing their sites of operation. The purpose of the research was to investigate the effects of carazolol on some serum enzymes, trace elements and cardiovascular status in sheep. Seven sheeps (age 6 months, 35 ± 10 kg) were used in this study. Carazolol administered by the intramuscular route at the dose of 0.01 mg/kg. Serum levels of urea, creatinin, ALT, AST, G-GT, LDH, T. protein, Ca, P, Mg, Cu, Fe, Zn, Se were investigated. Although all serum enzymes did not show any difference, serum Fe and Zn levels were decreased. Important results were obtained in electrocardiography (abnormal T wave and ST segment depression). These results suggest that carazolol may increase incidence rate of myocardiyal ischemia risk in sheeps and it investigated by new researches.

Aflatoxins, produced by Aspergillus spp., are strongly toxic and carcinogenic fungal secondary metabolites. Aflatoxin biosynthesis is a complex process and involves at least 30 genes clustered within an approximately 75 kB gene cluster. In this paper, we reviewed current status of the researches on the characterized structural genes involved in aflatoxin biosynthesis and their roles in aflatoxin-producing fungi, especially in A. flavus and A. parasiticus, which will improve our understanding of the mechanism of aflatoxin biosynthesis and regulation and provide reference for further study.

This study purposed to study the Preservative agents that are required to ensure that manufactured foods remain safe and unspoiled; work was conducted to evaluate the efficacy of essential oils from two eucalyptus species, Eucalyptus grandis and Eucalyptus crebra in food preservatives; to run this experiment flesh eucalyptus leaves collected from Ruhande Arboretum forest were submitted to hydrodistillation and yields(amount) of 0.38 and 0.34 % for Eucalyptus grandis and Eucalyptus crebra were obtained, respectively. Phaseolus vulgaris, Sorghum condatum, cooked Ipomoea batatas (sweet potatoes) and bread were the sample foods used to assess their preservative efficacy. Acanthoscelides obtectus and Stophilus oryzae were used as pests for Phaseolus vulgaris and Sorghum condatum respectively. For bread and cooked Ipomoea batatas, Rhizopus nigricans are used to assess the efficacy of these two essential oils to inhibit their growth; the obtained results revealed that those essential oils could act as insecticide in the storage of Phaseolus vulgaris and Sorghum condatum. Essential oil from Eucalyptus grandis protected these two foods against pests in the periods of 4 and 9 days, respectively while essential oil from Eucalyptus crebra protected them for the periods of 6 and 11days, respectively.

The misuse of topical corticosteroids for skin whitening has grown to be a serious public health issue, notably in South Asia, Africa, and the Middle East. Easy over-the-counter availability, social pressures, and strong cosmetic marketing have all contributed to its widespread use, commonly without medical supervision. This practice has been linked to a number of dermatological problems, including skin atrophy, pigmentary diseases, tinea incognito, and an alarming increase in antifungal resistance to first-line medications like terbinafine. This article examines the incidence of overuse, the underlying pathophysiology, and the dermatological and psychosocial repercussions. Prescription control, improved medical and pharmacy curriculum, digital literacy programs, and appropriate telemedicine utilization are all necessary for effective interventions. Steroid abuse is more than just a cosmetic issue; it is a developing dermatological and antimicrobial resistance hazard that requires immediate, concerted action.

Before discussing the crux of the matter, it is important to understand what “wild” signifies and the characteristics that define a wild animal. As contrasted to domesticated animals, a wild animal can be defined as an animal living freely in his natural habitat, independently of Man. These animals are only exposed to variations in the biological equilibrium, to the imperatives of their genetic program and live in a habitat that gives them the possibility of expressing it themselves. However, this definition is very narrow as there exist a number of species of wild animals that don’t live freely in their natural habitat. These animals are constrained by Man, who by creating a relationship of dependence, controls them and in turn becomes responsible for their sustenance. In such a situation, their habitat is no more their natural habitat but than which has been imposed on them by Man; such animals are said to be “held in captivity” or even “tamed”. In short, when talking about law and ethics related to wild animals, there are two things to be taken into account: wild animals that live in the wild and wild animals that live held in captivity by Man.

Excipients are fundamental components of galenic formulations, critically influencing the safety and efficacy of the final medicinal product. This is of paramount importance in neonatal and pediatric populations, where physiological immaturity results in significant differences in pharmacokinetics and pharmacodynamics compared to adults. This work provides a comprehensive overview of excipients and vehicles used in galenic preparations for these vulnerable groups. It highlights specific excipients known to be dangerous, detailing their mechanisms of toxicity, and suggests safer alternatives. The discussion covers formulations for oral solutions, suspensions, and topical dermatological use, including ready-to-use vehicles. The role of the prescribing physician and the verifying pharmacist is emphasized, underscoring the necessity of checking for efficacy, safety, incompatibilities, and microbiological compatibility. The results of a practical five-year local experience with an observational analysis are provided.Furthermore, innovative technologies such as 3D printing for pediatric dosage forms are discussed. The conclusion asserts that a rigorous, risk-based assessment of excipients is essential in neonatal and pediatric galenic practice to ensure patient safety.