• Tobin Elgaard opublikował 1 rok, 3 miesiące temu

    An electrochemical immunosensor for the accurate detection of cat neutrophil gelatinase-associated lipocalin (NGAL) in urine samples based on an electrode with a monolayer of gold nanoparticles (AuNPs) was proposed in this study. To fabricate the sensing electrode, a nickel mold with concave micron hemisphere array was prepared and then used to transfer the micron hemispherical structure onto a polyethylene terephthalate (PET) film using the hot embossing technique. A gold thin film was sputtered onto the micron hemispherical structure array, after which 1,6-hexanedithol and AuNPs were uniformly deposited on the PET membrane to form a sensing electrode. The NGAL concentrations were measured by electrochemical impedance spectroscopy after attaching the anti-NGAL. Results revealed that the proposed sensing scheme exhibited a wide dynamic detection range from 1 to 100 ng/mL, which is far enough to distinguish the healthy (NGAL concentration less then 10 ng/mL) from the damaged kidney. A low limit of detection and high sensitivity of 0.47 ng/mL and 10261.8 Ω ng-1mL, respectively, were also measured. After performing real sample detection using urine samples from cats collected at a veterinary hospital, the results confirmed that the proposed NGAL detection approach in this research could accurately detect the concentration of NGAL in cat urine samples.Glial fibrillary acidic protein (GFAP) is a member of the intermediate filament family of proteins with increased levels in serum and cerebrospinal fluid of patients with Alzheimer disease (AD) and other neurodegenerative diseases (NDs), such as vascular dementia (VD). This work describes the first magnetic microbeads (MBs)-based electrochemical immunoplatform for GFAP determination. The platform design comprises a sandwich immunoassay implemented on the MBs surface and amperometric transduction at single-use screen-printed carbon electrodes (SPCEs). Micro-sized carboxylic acid magnetic particles (COOH-MBs) were modified with a specific capture antibody (CAb) to selectively link the target protein, which was sandwiched with a biotinylated detector antibody (btn-DAb) further conjugated with a streptavidin-peroxidase (Strep-HRP) conjugate. Amperometric transduction was performed at SPCEs upon capturing the magnetic bioconjugates on their surface and through the hydrogen peroxide/hydroquinone (H2O2/HQ) system. The immunoplatform achieved a limit of detection of 67 pg mL-1 for the amperometric detection of standards and selectivity compatible with clinical applicability to assist in minimally invasive NDs diagnosis and prognosis. The MBs-based immunoplatform was applied with good results to determine the endogenous content of GFAP in protein brain extracts without matrix effect and using just 6.25 ng of sample per determination. Furthermore, the developed methodology was capable of differentiating between healthy subjects and patients diagnosed with VD and AD in only 2 h, providing accurate results in line with those obtained by an ELISA kit that used the same immunoreagents.Clostridioides difficile infection is one of the leading causes of antibiotic-associated infectious diarrhea, and is associated with increased incidence and severity worldwide. While antibiotics have traditionally been used for prophylaxis and treatment of C. difficile infection, elevated antibiotic resistance has promoted the development and spread of C. difficile infection. Since the current standard-of-care antibiotics are ineffective for treating infections, there is an urgent need for novel antibacterial drugs or strategies to target C. difficile infection. C. difficile virulence and vital physiological functions are considered to be ideal targets. Thus, several promising lead compounds have been identified through screening both synthetic and natural product libraries. The goal of this review is to provide an update of the current scientific knowledge of C. difficile infection, focusing on small molecule inhibitors, which can effectively inhibit C. difficile by suppressing virulence or destroying vital physiological structures.The most widely known studies of rhythmic limb coordination showed that frequency strongly affects the stability of some coordinations (e.g. 180° relative phase) but not others (e.g. 0°). The coupling of such rhythmic limb movements was then shown to be perceptual. Frequency affected the stability of perceptual information. We now investigated whether frequency would impact the pickup of information for learning a novel bimanual coordination pattern (e.g. 90°) and the ability to sustain the coordination at various frequencies. Twenty participants were recruited and assessed on their performance of bimanual coordination at 0°, 180°, and 90° at five scanning frequencies before and after training at 90°, during which they were assigned to practice with either a high (2.5 Hz) or low (0.5 Hz) frequency until attaining proficiency. The results showed that learning was frequency specific. The best post-training performance occurred at the trained frequency. Although the coordination could be acquired through high frequency training, it was at the cost of a greater amount of training and most surprisingly, did not yield improved performance at lower frequencies that are normally thought to be easier. The findings suggest that movement frequency may determine whether visual or kinesthetic information is used for learning and control of bimanual coordination.We present a novel artificial cognitive mapping system using generative deep neural networks, called variational autoencoder/generative adversarial network (VAE/GAN), which can map input images to latent vectors and generate temporal sequences internally. The results show that the distance of the predicted image is reflected in the distance of the corresponding latent vector after training. This indicates that the latent space is self-organized to reflect the proximity structure of the dataset and may provide a mechanism through which many aspects of cognition are spatially represented. The present study allows the network to internally generate temporal sequences that are analogous to the hippocampal replay/pre-play ability, where VAE produces only near-accurate replays of past experiences, but by introducing GANs, the generated sequences are coupled with instability and novelty.Cellulase enzymes have wide range of industrial application, but high production cost and relatively low efficiency are the main issues, which are needed to resolve. Substrate is known as the main contributor which can bring down the production cost of these enzymes at large scale. Therefore, in the present study, corn cob (Cc) waste has been employed as a potential substrate to produce efficient and good amount of cellulase using the bacterial strain Bacillus subtilis. Under the influence of optimal parameters while using the optimum concentration of Cc (7.0 g), maximum 12 IU/gds FP, 97 IU/gds BGL and 129 IU/gds EG have been recorded. Additionally, crude enzyme showed maximum FP activity of 14 IU/gds using 1.0 g/L peptone employed as the optimum organic nitrogen source. The bacterial cellulase exhibits temperature tolerance ability at 55 °C, and retains its half-life activity for 5 h and pH tolerance at pH 7.0 up to 55% of the relative activity. The results recorded in the present study may have potential for the large-scale and low-cost bacterial cellulase production using cellulose rich substrate e.g. Cc waste that can be vital for numerous industrial applications.The present work was performed to study the enterobacteria involved in the ripening of the artisanal raw ewe’s milk PDO cheeses 'Torta del Casar’ and 'Queso de la Serena’ produced in Extremadura (Spain). These isolates were strain-typed, safety tested and characterized for some important technological properties. A total of 485 enterobacterial isolates were clustered by RAPD-PCR and subsequently identified by partial sequencing of the 16S rRNA gene. Among the 17 different species identified, Hafnia paralvei was the predominant species; H. alvei and Lelliottia amnigena were present to a lesser extent. Therefore, 55 Hafnia spp. strains, selected according to their genetic profile and dairy origin, were tested for the safe application. Overall, they were able to produce the biogenic amines putrescine and cadaverine under favourable conditions, presented α-haemolytic activity and did not produce cytolytic toxin active against HeLa cells or contain virulence genes. In addition, antibiotic susceptibility profiles showed that 17 Hafnia spp. strains were less resistant to the 33 antibiotics tested; subsequently, they were further technologically characterized. Although they showed differences, in general, they were well adapted to the stress conditions of cheese ripening. Among them, two strains, H. alvei 544 and 1142, are highlighted mainly due to their proteolytic activity at refrigeration temperatures and their low or null gas production. Although further studies are necessary before industrial application, these two strains are proposed for potential use as adjunct cultures to favour the homogeneity of these PDO cheeses, preserving their unique sensory characteristics.The inactivation of Escherichia coli O157H7 ATCC 35150 and methicillin-resistant S. aureus ATCC 33591 by a light emitting diode (LED) was investigated in the present study. Various wavelengths of LEDs (365, 385, and 405 nm) were used individually or combined with folic acid (LEDF), and inactivation curves were analyzed using the Weibull model to compare the bactericidal effects. Reduction levels of pathogens by combination treatment of LED and 100 μM folic acid were significantly higher than those by individual LED treatment for the wavelength used in this study. It was confirmed that the reactive oxygen species produced by folic acid degradation accelerated the bactericidal effect of LEDs. When applied in apple juice, the same trend was observed by 405 nm treatment, although the inactivation rates were higher than those of buffer due to the low pH of apple juice. Moreover, injured cells were not observed except 30 J/cm2 LED, LEDF and 36 J/cm2 LEDF treatments. Mode of inactivation by LEDF was suggested as DNA damage along with membrane damages. Moreover, it was validated that genes related to antimicrobial resistance would be mutated by LEDF treatment. Therefore, LEDF can be used effectively to control foodborne pathogens in apple juice.Human papillomaviruses (HPVs) constitute a number of double-stranded DNA viruses with propensity to cause infection in squamous epithelial cells. Certain types of these viruses have been found to cause human cancers through delivering their oncoproteins E6 and E7. Since not all of infected patients develop malignant lesions, other factors might affect HPV-associate carcinogenic processes. A number of investigations have shown interaction between HPV-encoded proteins and a number of non-coding RNAs, principally microRNAs (miRNAs) and long non-coding RNAs (lncRNAs). Such interactions have been found to influence pathogenesis of HPV-related cancers. miR-21, miR-9, miR-143, miR-214 and let-7 are among miRNAs that contribute in the pathogenesis of HPV-related lesions. HOTAIR, SNHG8, SOX2OT, SNHG12, GABPB1-AS1, SOX21-AS1, DINO, HOST2, CCDST, FAM83H-AS1, TMPOP2 and CCEPR are examples of lncRNAs that contribute in this process. In the current review, we provide an outline of investigations that reported the impact of these transcripts in HPV-related cancers.

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