Zone Diameter Research Articles

The efficacy of orthokeratology lenses with smaller back optic zone diameter in myopia control. A meta-analysis.

This study was conducted to determine whether orthokeratology (OK) lenses with a smaller back optic zone diameter (BOZD) could exhibit stronger myopia control effects. A meta-analysis was registered in PROSPERO (CRD42023408184). A comprehensive systematic database search was conducted, encompassing PubMed, Cochrane Library, EMBASE, MEDLINE, Web of Science, Ovid, CNKI and CBM, to identify relevant studies up to 25 March 2023. The primary inclusion criteria for this meta-analysis were studies that investigated the myopia control effect of OK lenses with a small optical treatment area (≤5 mm). To assess the quality of the retrieved articles, two researchers evaluated them using the Cochrane bias risk assessment criteria. The primary outcome measures were the changes in axial length (AL) and refractive error, using the weighted mean differences (WMD) and 95% confidence intervals (CI) to assess differences between small and traditional back optical treatment zone groups in terms of these outcomes. The analysis encompassed five eligible studies, with a 1 year duration. The average difference in AL between the groups was 0.12 mm (WMD = -0.12, 95% CI [-0.16, -0.09], p < 0.00001). Likewise, the average difference in refractive error between the two groups was 0.44 D (WMD = 0.44, 95% CI [0.30, 0.57], p < 0.00001). None of the studies reported severe adverse events. Current evidence suggests that OK lenses with smaller back optical treatment zone are more effective in preventing myopia progression than traditional lenses. However, a longer-term evaluation is warranted.

Capability lignin from Acacia crassicarpa black liquor as an environmentally benign antibacterial agent to produce antibacterial and hydrophobic textiles

Recently, the growing health awareness of society on the utilization of fabrics has led to an increasing demand for natural-based antibacterial textiles. Lignin, a generous polyphenol compound in nature, is capable of preventing bacterial growth; in particular, it dwells bacteria closely together on human skin, such as Staphylococcus epidermidis, Bacillus subtilis, Propionibacterium acnes, and Staphylococcus aureus. However, the antibacterial properties of lignin are limited by factors such as the lignin concentration, source, and type of bacteria. This study aimed to evaluate the potency of lignin as an antibacterial agent for textiles. Moreover, the thermal properties and wettability of the textile after lignin coating were also investigated. This study showed that lignin isolation methods significantly contributed to the inhibition of bacterial growth in the clear zone diameter. In addition, the lignin structure, lignin concentration, and type of bacteria had notably different antibacterial effects. SEM images showed that lignin was successfully coated on the fiber, and the antibacterial textile was successfully fabricated with clear zones in the range of 0.1–0.5 cm against four different bacteria. Lignin did not significantly improve the thermal stability of the textile, as proven by the TGA results. After the HDTMS coating by dispersion method, the wettability of the lignin-textile improved to that of the hydrophobic material, with a contact angle greater than 119.05° with excellent antibacterial properties (clear zone of 0.1–0.43 cm).

Ethnomedical Study of Traditional Medicinal Plants for Cough and Tuberculosis (TB) of the Helong Tribe on Semau Island, Kupang Regency, East Nusa Tenggara

The Helong people in Kupang Regency, NTT Province, have experienced being exposed to cough and tuberculosis (TB). Therefore, it is believed that this community has also long since developed their local knowledge and traditional ways to prevent and treat the disease. In general, this study aims to analyze and find the concept of the Helong Tribe community and ethnomedical practices for the prevention and treatment of cough and tuberculosis (TB). This research is a medical anthropology research using a qualitative research method with an ethnographic approach, which is supported by laboratory research and literature studies. Field research was carried out on Semau Island, NTT Province, involving traditional medicine. The results of the research conducted in the form of interviews with traditional medicine practitioners in the Helong tribe obtained as many as 31 plants used in treatment, and there were 3 plants used to treat cough, including hemorrhagic cough/tuberculosis, namely plants: white banyan (Ficus benjamina L), mesocarp palm fruit (Borassus flabellifer L.) and white flower (Clerodendrum costatum R.Br). The three plants that are suspected to have the ability to treat cough and cough up blood carried out preliminary tests of antibacterial activity against bacteria that generally cause stones, namely Staphylococcus aureus bacteria. The results obtained for ethanol extract of white banyan leaves (Ficus benjamina L) with a concentration of 25% b/v with a diameter of 16.53 mm, 50% b/v with a diameter of 16.33 mm, and 75% b/v with a diameter of 16.56 mm. Mesocarp ethanol extract of palm fruit (Borassus flabellifer L.) At a concentration of 25% b/v with an inhibitory zone diameter of 11.60 mm, a concentration of 50% b/v with an inhibitory zone diameter of 12.30 mm, a concentration of 75% b/v with an inhibitory zone diameter of 13.40 mm, for white flowers (Clerodendrum costatum R.Br) at a concentration of 25%b/v with an inhibitory zone diameter of 9.41 mm, a concentration of 50% b/v of 10.36 mm and a concentration of 75% b/v of 11.24 mm. This means that the three plants have antibacterial activity against Staphylococcus aureus bacteria. Furthermore, for the antibacterial activity test against Mycobacterium tuberculosis bacteria for white banyan plants (Ficus benjamina L.), mesocarp of palm fruit (Borassus flabellifer L.), and white flowers (Clerodendrum costatum R.Br) by the MODS (Microscopically Observed Drug Susceptibility) method, it was obtained that the three plants at concentrations of 250 ppm, 500 ppm, and 1000 ppm were only seen to have the growth of Micobacterium tuberculosis bacteria in the second week. Passive control with INH observation until week IV did not see any bacterial growth, while for negative control in the first week, the growth of Mycobacterium tuberculosis bacteria was seen. It can be concluded that a concentration greater than 1000 ppm is needed for the three plants to inhibit the growth of Mycobacterium tuberculosis bacteria.

Phytochemical analysis and antimicrobial activity of coconut husk extract on various solvents

Coconut is known as the “wonder food” and is regarded as perfect diet because it contains almost all essential nutrients needed by the human body. Coconut husk is a by-product of the coconut that known contains phytochemical compounds and antimicrobial activities. This study aims to determine the phytochemical characteristics and the antimicrobial activity of coconut husk extracts. Completely Randomized Design was used in this study and the effect of coconut husk and the different solvent type were investigated. These are selected Five different solvents, they are polar solvent and non-polar i.e. Acetone, Ethanol, Methanol, Chloroform and Petroleum ether. The phytochemicals characteristic and antimicrobial activity of coconut husk extract were determined. The results of this study indicated that coconut husk extract containing Carbohydrates, Reducing sugar, Sugar, Proteins, Tannins, Saponin, Flavonoids, Steroids. and terpenoids. The coconut husk extracts showed antimicrobial activity against Streptococcus cocci and E. coli and the microbes isolated from soil. The coconut husk extracted with Acetone show the highest antimicrobial activity. The highest antimicrobial activity against Streptococcus cocci bacteria with inhibition zone diameter of 10 mm, and the coconut husk extract with Ethanol show the lowest inhibition antimicrobial activity these are 04 mm against E. coli. The extract was observed to be more effective against Streptococcus cocci. Presence of tannins and other phenolic compound ds may responsible for antimicrobial activity.

Natural Inhibitory Treatment of Fungi-Induced Deterioration of Carbonate and Cellulosic Ancient Monuments: Isolation, Identification and Simulation of Biogenic Deterioration.

Fungi play a significant role in the deterioration of various types of monuments. Therefore, the protection of ancient monuments from fungal attacks is an important goal that must attract the attention of researchers worldwide. A total of 69 fungal isolates were recovered from 22 deteriorated objects compromising paper, textiles, wood, and stone in the National Museum of Egyptian Civilization (NMEC) storeroom, Cairo, Egypt. The isolates were identified as 12 different species categorized into three different genera, namely, Aspergillus (9 species), Penicillium (2 species) and Trichoderma (1 species). Among them, Aspergillus fumigatus was the most prevalent species. Three essential oils were assessed for antifungal activity and compared with the antifungal effects of five synthetic microcides to identify a natural inhibitory treatment. Thyme oil and sodium azide were found to be the most active growth inhibitors, with minimum inhibitory concentrations (MICs) of 625 and 100 ppm, with inhibition zone diameters of 19.0 ± 0.70 - 23.76 ± 1.15 and 13.30 ± 0.35 - 19.66 ± 0.54 mm, respectively. An in vitro simulation of the biodeterioration process was conducted using spores of the A. fumigatus strain NMEC-PSTW.1 on model cubes made of paper, textile, wood, and stone materials. The changes in the characteristics of the artificially deteriorated materials were analyzed using environmental scanning electron microscopy/energy dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy. The results revealed changes in the morphology, physical properties, and chemical composition induced by A. fumigatus NMEC-PSTW.1. Overall, thyme oil is recommended as a natural inhibitor to protect carbonate and cellulosic monuments in NMEC against fungal attack.

Application of Prebiotics and Probiotics to Improve Oral and Dental Health by Inhibiting Streptococcus mutans

Background: The most common method to combat microorganisms that cause tooth decay is the use of antibiotics. However, despite the benefits of antibiotics, their use has significant disadvantages, such as the increased resistance of microorganisms to these chemicals. Objectives: A promising and safer alternative is the use of probiotics and prebiotics, which can reduce or inhibit the growth of disease-causing oral microorganisms. Streptococcus salivarius is one such probiotic, while inulin and nisin are the prebiotics commonly recommended for this purpose. Methods: Several assays, including agar bilayer interference, agar well penetration, and microdilution, were used to assess the antibacterial activities of S. salivarius K12 and S. salivarius M18 probiotics, as well as those of the prebiotics nisin and inulin. Additionally, bile salt and low pH tolerance assessments were conducted for the probiotics, and the synthesis of bacteriocins by the probiotics was verified using proteolytic and enzymatic activity assays. Results: The minimum inhibitory concentration (MIC) assay revealed that Streptococcus mutans growth was inhibited by S. salivarius K12 and S. salivarius M18 at a concentration of 75%, and by nisin and inulin at 200 IU/mL. In the well penetration assay, S. salivarius K12 exhibited significantly better results compared to S. salivarius M18. Nisin had significantly greater inhibitory effects on S. mutans compared to inulin. A combination of all four components (S. salivarius K12, S. salivarius M18, nisin, and inulin) resulted in maximum antibacterial activity, indicating a synergistic effect. Based on the agar bilayer assay and the growth inhibition zone diameters, nisin showed the highest antibacterial activity against S. mutans, followed by S. salivarius K12, inulin, and S. salivarius M18. Enzymatic digestion and proteolytic activity assays confirmed the synthesis of bacteriocins by S. salivarius K12 and S. salivarius M18. Both probiotics demonstrated bile salt tolerance at a concentration of 0.3% and surviving rates of 36% and 33%, respectively, at pH 2. Conclusions: The most important finding of the current study is the synergistic effect between the highlighted prebiotics and probiotics, which may offer a novel and effective combination for preventing tooth decay.

Strategically engineered multifunctional graphene oxide hybrid nanomaterials for efficient catalytic degradation and emerging contaminants treatment

The use of functional textiles is growing in all fields of science and technology. Surface functionalization is mainly used to impart conventional textiles with new functionalities and improved performances. In the present study, a cobalt ferrite nanoparticle/graphene oxide (CoFe2O4/GO) coated polyethylene terephthalate (PET) fabric with excellent catalytic and antibacterial properties, has been successfully developed. The PET-coated CoFe2O4/GO samples, ranging from 1 % to 5 % wt. were obtained using a simple dip-coating method in CoFeO/GO solution (1 mg/mL), and were investigated through several physiochemical characterization techniques. CoFe2O4/GO and PET fabric have been shown to establish an interfacial connection by Fourier transform infrared spectroscopy (FTIR). X-ray diffraction (XRD) results showed that CoFe2O4/GO coating did not affect the PET crystallinity and that CoFe2O4/GO hybrid was incorporated in the PET samples, which was proved as well by the morphological study through Scanning electron microscopy (SEM). Furthermore, thermogravimetric characterisation (TGA) verified that the coating does not change or impair the quality of the fibre and that the PET@CoFe2O4/GO as made is thermally stable. Tensile strength tests demonstrated that coated fabrics exhibited outstanding mechanical properties in comparison with pristine PET. Moreover, the coated PET@CoFe2O4/GO fabric was used as a model catalytic system for peroxymonosulfate (PMS) activation in the rhodamine B (RhB) degradation reaction. Total Organic Carbon (TOC) measurements showed that TOC removal reached 89.82 % in only 12 min reaction. The results confirmed that the coated fabrics exhibited high catalytic performances, good stability and reusability in consecutive degradation experiments with a degradation rate over 60 % even after 7 degradation cycles; Moreover, it is easily and simply separated from the mixture, by removing the textile sample from the aqueous solution. It is worth mentioning that the PET@CoFe2O4/GO fabrics showed outstanding antibacterial activity against both Staphylococcus aureus (Gram-positive) and Escherichia coli (Gram-negative) bacteria with an inhibition diameter zone of up to 13 mm for PET@CoFe2O4/GO (5 %). Overall, these findings are of great importance as they permit the development of a novel multifunctional textile fabric, combining anti-bacterial activity, catalytic performance and mechanical properties. The study provides a textile-based catalyst with improved catalytic performance, re-usability in consecutive degradation reactions and easy catalyst separation compared to traditional supports. Thus, a huge potential application in several fields such as medicine, heterogeneous catalysis, and wastewater treatment.

Phytochemical Analysis and Antimicrobial Potential of Parthenium hysterophorous and Lantana camara.

Parthenium hysterophorous and Lantana camara are notable for their significant phytochemical and antimicrobial properties. Advancements in phytochemical research have led to the development of novel formulations and products derived from P. hysterophorus and L. camara. For instance, patent extracts from these plants have been utilized in the formulation of pharmaceutical drugs, herbal supplements, cosmeceuticals, and agricultural products. P. hysterophorous, commonly known as Santa Maria feverfew or Congress grass, contains various bioactive compounds like terpenoids, flavonoids, phenolics, and alkaloids.These compounds are the key to its medicinal properties, particularly its antimicrobial activity. On the other hand, L. camara, often referred to as wild sage, is rich in phytochemicals such as terpenoids, flavonoids, and alkaloid glycosides. P. hysterophorous and L. camara plants selected and checking their antimicrobial activity by agar well diffusion method. In our study, we found that the leaf extract of P. hysterophorous exhibited the most potent antibacterial activity against E. coli. P. hysterophorous exhibited the most potent antifungal activity against A. niger and T. viride, with a diameter of inhibition zone measuring 12 mm, followed by A. flavus and A. parasiticus. In case of L. camara, the inhibitory zone ranging from 14 to 18 mm was detected against S. abony, P. aeruginosa, E. coli, and K. pneumonia. The leaf extract of the maximum zone of inhibition in case of L. camara was shown by A. flavus (12mm). The present study suggests that these two weeds could be useful in the development of bactericides and fungicides.

Genomic Insights into Pediococcus pentosaceus ENM104: A Probiotic with Potential Antimicrobial and Cholesterol-Reducing Properties.

Pediococcus pentosaceus, which often occurs in fermented foods, is characterized by numerous positive effects on the human health, such as the presence of possible probiotic abilities, the reduction of cholesterol levels, satisfactory antimicrobial activity, and certain therapeutic functions. This study was conducted with the goal of describing the genomic content of Pediococcus pentosaceus ENM104, a strain known for its inhibitory effects against pathogenic bacteria and its remarkable probiotic potential, including the induction of significant reductions in cholesterol levels and the production of γ-aminobutyric acid (GABA). The P. pentosaceus ENM104 chromosome is circular. The chromosome is 1,734,928 bp with a GC content of 37.2%. P. pentosaceus also harbors a circular plasmid, pENM104, that is 71,811 bp with a GC content of 38.1%. Functional annotations identified numerous genes associated with probiotic traits, including those involved in stress adaptation (e.g., heat stress: htpX, dnaK, and dnaJ), bile tolerance (e.g., ppaC), vitamin biosynthesis (e.g., ribU, ribZ, ribF, and btuD), immunomodulation (e.g., dltA, dltC, and dltD), and bacteriocin production (e.g., pedA). Notably, genes responsible for lowering cholesterol levels (bile salt hydrolase, bsh) and GABA synthesis (glutamate/GABA antiporter, gadC) were also identified. The in vitro assay results using cell-free supernatants of P. pentosaceus ENM104 revealed antibacterial activity against carbapenem-resistant bacteria, such as Pseudomonas aeruginosa, Klebsiella pneumoniae, and Acinetobacter baumannii, and the inhibition zone diameter increased progressively over time. This comprehensive study provides valuable insights into the molecular characteristics of P. pentosaceus ENM104, emphasizing its potential as a probiotic. Its notable cholesterol-lowering, GABA-producing, and antimicrobial capabilities suggest promising applications in the pharmaceutical and food industries. Future research should focus on further exploring these functional properties and assessing the strain's efficacy in clinical settings.

In-vitro Antimicrobial Activity of Mtad, Photoactivated Disinfection Along with Chlorohexidine on Enterococcus faecalis, Staphylococcus aureus and Candida albicans

This study evaluated the antimicrobial activity of five root canal irrigants against MTCC of Enterococcus faecalis, Staphylococcus aureus, Candida albicans, in-vitro study of the inhibitory activity of PAD in conventional Endodontic Treatment (CET) and also combination of CET with PAD (CHX+PAD). All of these microorganisms were incubated in the presence of an Endodontic irrigant. Agar diffusion tests were performed and colony counts were tested using paper point to evaluate the inhibitory effect of the irrigants. The mean diameters of the inhibition zones for C. albican were 21mm 3% Naocl, 19mm CHX, 0.7PAD, 22mm CHX+PAD, 20mm Fluconazole, 18mm Doxycycline. The zone diameters of the inhibition zones of Enterococcus faecalis were 17mm 0.5% Naocl, 18mm CHX, 12mmPAD, 35mm MTAD, and 19mm PAD+CHX. The Zone Diameter of the inhibition zones of Staphylococcus aureus were 18mmCHX, 12mm PAD, 19mm PAD+CHX, 25mm MTAD, and 19mm 3% NaoCl. Together High inhibitory effect was detected for PAD+CHX and MTAD on all three pathogens. Candida showed more inhibition to all irrigants followed by Staphylococcus aureus and Enterococcus faecalis.

Antibacterial Properties of Dandelion Extract-Based PVA/CTS/DAN/CuNP Composite Gel

Dandelion extract is a reducing agent, and CuSO4∙5H2O was used as a carrier to create copper nanoparticles (CuNPs). A novel polyvinyl alcohol–chitosan–dandelion–CuNP (PVA/CTS/DAN/CuNP) gel was acquired by cross-linking Polyvinyl alcohol (PVA) and chitosan (CTS) solution. Its structure was analyzed using Fourier transform infrared spectroscopy, Scanning electron microscopy, and X-ray diffraction. The PVA/CTS/DAN/CuNP gels manifested good stability, recycling ability, swelling properties, and biocompatibility. Using the agar diffusion method, the diameters of the inhibition zone of the composite gel against Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa could be over 21 mm. In conclusion, the PVA/CTS/DAN/CuNP composite gel had good antibacterial performance, which has a high potential for application in microbial contamination treatment and environmental protection.

Dioscorea hispida (Dennst.) Tuber: Unraveling The Phytochemical Basis for Anthelmintic and Antifungal effects

Tropical diseases are prevalent ailments that manifest in tropical and subtropical regions in 149 countries. Various microorganisms, including bacteria, fungi, and worms, are responsible for the onset of tropical diseases. This infectious disease is frequently observed in nations with lower economic resources. The tubers of Dioscorea hispida possess the capacity to demonstrate anthelmintic and antifungal characteristics as a result of the existence of secondary metabolites. The tuber of Dioscorea hispida will undergo extraction followed by liquid-liquid fractionation using n-hexane, ethyl acetate, and ethanol-water solvents. The antifungal activity of the extracts and fractions was evaluated in vitro against Candida albicans and Trichophyton mentagrophytes for antifungal activity, and the anthelmintic activity was evaluated in vitro against Pheretima posthuma during paralysis and death for anthelmintic activity The extract Dioscorea hispida (Dennst) tuber showed good anthelmintic and antifungal efficacy; The phytochemical component in the ethyl acetate fraction had the highest performance at a concentration of 30 g/L with paralysis time of 23.90±2.94 and death time of 34.20±2.31 for anthelmintic, in line with that the ethyl acetate fraction also has antifungal activity which is strong at a minimum inhibitory concentration of 5 g/L with an inhibition zone diameter of 11.00 ± 0.40. The ethyl acetate fraction contains several metabolites, including alkaloids, flavonoids, glycosides, and tannins, which exhibit notable effectiveness as anthelmintics and antifungals.

Screening and Characterization of Probiotics Isolated from Traditional Fermented Products of Ethnic-Minorities in Northwest China and Evaluation Replacing Antibiotics Breeding Effect in Broiler.

In this study, Lactobacillus fermentum DM7-6 (DM7-6), Lactobacillus plantarum DM9-7 (DM9-7), and Bacillus subtilis YF9-4 (YF9-4) were isolated from traditional fermented products. The survival rate of DM7-6, DM9-7, and YF9-4 in simulated intestinal gastric fluid reached 61.29%, 44.82%, and 55.26%, respectively. These strains had inhibition ability against common pathogens, and the inhibition zone diameters were more than 7 mm. Antioxidant tests showed these strains had good scavenging capacity for superoxide anion, hydroxyl radical and DPPH, and the total reduction capacity reached 65%. Then DM7-6, DM9-7 and YF9-4 were fed to broilers to study the effects on antioxidant capacity, immune response, biochemical indices, tissue morphology, and gut microbiota. 180 healthy broilers were allocated randomly into six experimental groups. SOD, GSH-Px, and T-AOC in broilers serum were detected, and the results showed probiotics significantly improve antioxidant capacity compared to CK group, while antibiotics showed the opposite result. Besides, IgA, IgM, IgG, TNF-α, and IL-2 indicated it could significantly improve immunity by adding probiotics in broilers diets. However, antibiotics reduced immunoglobulin levels and enhanced inflammation index. Biochemical indicators and tissue morphology showed probiotics had a protective effect on metabolic organs. Gut microbiota analysis proved antibiotics could significantly decrease microbial community diversity and increase the proportion of opportunistic pathogens, while probiotics could improve the diversity of gut microbiota and promote the colonization of beneficial microorganisms. In summary, probiotics DM7-6, DM9-7, and YF9-4 can improve the broiler's health by improving antioxidant capacity and immune function, regulating gut microbiota, and can be used as alternative probiotics for antibiotics-free breeding of broilers.

Microfluidic paper-based analytical device for measurement of pH using as sensor red cabbage anthocyanins and gum arabic

The objective of this study was to develop and validate a novel microfluidic paper-based analytical device (μPADpH) for determining the pH levels in foods. Anthocyanins from red cabbage aqueous extract (RCAE) were used as its analytical sensor. Whatman No. 1 filter paper was the most suitable for the device due to its porosity and fiber organization, which allows for maximum color intensity and minimal color heterogeneity of the RCAE in the detection zone of the μPADpH. To ensure the color stability of the RCAE for commercial use of the μPADpH, gum arabic was added. The geometric design of the μPADpH, including the channel length and separation zone diameter, was systematically optimized using colored food. The validation showed that the μPADpH did not differ from the pH meter when analyzing natural foods. However, certain additives in processed foods were found to increase the pH values.

Commercially available tests for determining cefiderocol susceptibility display variable performance in the Achromobacter genus

BackgroundCefiderocol is a siderophore-conjugated cephalosporin increasingly used in the management of Achromobacter infections. Testing for cefiderocol susceptibility is challenging with distinct recommendations depending on the pathogens.ObjectivesWe evaluated the performance of commercial tests for testing cefiderocol susceptibility in the Achromobacter genus and reviewed the literature.MethodsDiffusion (disks, MIC gradient test strips [MTS], Liofilchem) and broth microdilution (BMD) methods (ComASP™, Liofilchem; UMIC®, Bruker) were compared with the BMD reference method according to the EUCAST guidelines on 143 Achromobacter strains from 14 species with MIC50/90 of ≤ 0.015/0.5 mg/L. A literature search was conducted regardless of method or species.ResultsNone of the methods tested fulfilled an acceptable essential agreement (EA). MTS displayed the lowest EA (30.8%) after UMIC® (49%) and ComASP™ (76.9%). All methods achieved an acceptable bias, with MICs either underestimated using MTS (-1.3%) and ComASP™ (-14.2%) or overestimated with UMIC® (+ 9.1%). Inhibition zone diameters ranged from 6 to 38 mm (IZD50/90=33/30 mm). UMIC® and ComASP™ failed to categorize one or the two cefiderocol-resistant strains of this study as resistant unlike the diffusion-based methods. The literature review highlighted distinct performance of the available methods according to pathogens and testing conditions.ConclusionsThe use of MTS is discouraged for Achromobacter spp. Disk diffusion can be used to screen for susceptible strains by setting a threshold diameter of 30 mm. UMIC® and ComASP™ should not be used as the sole method but have to be systematically associated with disk diffusion to detect the yet rarely described cefiderocol-resistant Achromobacter sp. strains.

Imidazole‐Oxadiazole Hybrid as Potential Antimicrobial Agents: Design, Synthesis, Drug–Likeness, Pharmacophore and Molecular Docking Study

AbstractA new series of imidazole linked 1,3,4‐oxadizoles were designed and synthesized from 2‐butyl‐4‐chloro‐1H‐imidazole‐5‐carbaldehyde (1) as a starting material. The synthesized compounds were characterized by well–known spectroscopic techniques, i. e., IR, 1H NMR, 13C NMR, and mass spectrometry. Against Gram–positive bacteria S. aureus, compounds 8 e, 8 i, and 8 k showed the highest antibacterial activity with diameter zone values 25±0.44, 25±0.65, 22±0.91 mm respectively. Compounds 8 e, 8 g, and 8 i are active against Gram–negative bacteria E. coli with ZI of 26±0.58, 21±0.51, 26±0.71 mm. Interestingly, the molecules 8 a, and 8 h were more selective towards antifungal activity against F. oxysporum (ZI=21±0.11, 21±0.51 mm), compared to clotrimazole (19±0.13 mm). The docking study results of compound 8 d formed highly stable H‐bonding with Asp‐89, Asn‐145, Val‐88, Arg‐144 amino acids, which are plays a crucial role in ensuring efficient binding of the ligand in a crystal structure of S. aureus mutated in GyrB ATPase domain (PDB: 3U2K). The study of computer aided ADMET was also carried out, using SwissADME, ADMETlab2.0 to investigate the pharmacokinetic properties of the tested triazole compounds.

Preparation and Performance of Chitosan-gallic acid/Methacrylic Anhydride Composite Antibacterial Hydrogel

Firstly, chitosan-gallic acid derivative (GA-CS) was prepared by reacting chitosan (CS) with gallic acid (GA), which was combined with chitosan (CM) modified by methacrylic anhydride (MA) acylation as an antibacterial modifier, and the composite hydrogel was prepared by light curing. The mechanical properties, swelling rate, surface contact angle, water retention and micromorphology of the hydrogel were tested to explore the effect of GA-CS on the antibacterial effect of the composite hydrogel. The results showed that the compressive strength of the composite hydrogel was 225kPa, and with the addition of the antimicrobial monomer GA-CS, the antibacterial effect and water retention rate of the composite hydrogel increased. However, the surface contact angle with water increased compared with that without GA-CS, and the swelling rate decreased. When the mass ratio of GA-CS to CM was 2:98, the diameter of the inhibition zone increased from 9.85mm to 13.96mm of the pure chitosan sample, the surface contact angle with water was 17.6°, the swelling rate of the sample was 79.32% in 24 hours, and the water content of more than 50% could be maintained for about 7 hours.

Synthesis of Co(II), Mn(II), and Ni(II) complexes with 4-(4,6-bis(3,5-dimethyl-1H-pyrazol-1-yl)-1,3,5-triazin-2-yl)morpholine; X-ray structure, Hirshfeld, AIM, and biological studies

Three transition metal complexes of s-triazine ligand (MorphBPT) were synthesized, characterized, and their supramolecular structures are explored. Their structures are confirmed to be [Co(MorphBPT)2](ClO4)2 (1), [Mn(MorphBPT)2](ClO4)2 (2), and [Ni(MorphBPT)(H2O)3]Cl2·2H2O (3) using single crystal X-ray diffraction. In all cases, the MorphBPT is a tridentate N-chelator. Hence, the metal ions have hexa-coordination environment in all complexes. In the two homoleptic complexes 1 and 2, the O···H, C···H, and C···O contacts, in addition to some short N···O and H···H contacts detected only in 2, are the most important. For 3, the Cl···H, O···H, and C···H contacts are the most significant. Enrichment ratio was used to detect the atom pairs which have the highest probability to form non-covalent interactions. The nature of MN and MO coordination interactions is analyzed with the aid of AIM calculations. Also, the interactions with the ligand moieties lowers the charge of Co(II), Ni(II), and Mn(II) to 0.8411, 0.9332, and 0.8308 e, respectively. The three complexes 1, 2, and 3 exhibited antibacterial activity exceeds the reference drug gentamicin against P. vulgaris where the diameter of the inhibition zones (DIZs) are determined to be 28, 29, 27, and 25 mm, respectively. In addition, 1 and 2 have antifungal activity better (DIZ = 18 mm) and equal (DIZ = 17 mm) compared to ketoconazole against A. fumigatus, respectively. The Mn(II) complex 2 is the most active against MCF-7 (75.3 ± 3.1 μM) and A-549 (40.2 ± 2.7 μM) cancerous cell lines.

A Comparative Evaluation of Antifungal and Physical Properties When Nanoparticles Are Incorporated Into the Tissue Conditioner: An In Vitro Study.

Objective The objective of this in vitrostudy was to comparatively evaluate the antifungaland physical properties of tissue conditioner incorporated with nanoparticles (NPs) of different types and concentrations. Materials and methods A total of 198 tissue conditioner samples were used in this study. The samples were categorized into a control group, namely, tissue conditioner without NPs (Group 1), and test groups, namely, tissue conditioner incorporated with zinc oxide (ZnO) NPs (Group 2) andmagnesium oxide (MgO) NPs (Group 3). The antifungal properties and surface roughness of the samples were evaluated. The groups were further subdivided into seven subgroups: control (without NPs), 5% ZnO NPs, 10% ZnO NPs, 15% ZnO NPs, 3% MgO NPs, 5% MgO NPs, and 7% MgO NPs by weight. Surface roughness was measured using an optical profilometer,and antifungal activity was measured in terms of the diameter of the inhibition zone (DIZ) using the well diffusion method over seven days. Results The result showed that the 5%ZnO NPs subgroup had the lowest mean surface roughness, whereas the 15% ZnO NPs subgroup had the highest antifungal activity. Increasing the concentration of NPsincreased the antifungal property, and there was a steady decrease in DIZ from day one to day seven in all test groups. Conclusion Our results showed that the incorporation of various concentrations of ZnO and MgO NPs into tissue conditioner samples positively affected their physical and antifungal properties. The highest antifungal activity was found in the 15% ZnO NPs subgroup, and the lowest surface roughness was found in the 5% ZnO NPs subgroup.

Biological and physicochemical characterization of carbonated hydroxyapatite-honeycomb-polyethylene oxide bone scaffold fabricated using the freeze-drying method

In this work, a carbonated hydroxyapatite/honeycomb/polyethylene oxide (CHA/HCB/PEO) scaffold was fabricated using the freeze-drying method. The CHA bioceramic component was synthesized from oyster shells using the precipitation method. HCB and PEO act as reinforcing materials that influence the physicochemical properties of the scaffold and as antibacterial agents on the scaffold. The CHA produced was B-type, confirmed by Fourier transform infrared (FTIR) and x-ray diffractometer (XRD) spectra of the CHA. FTIR analysis of the scaffold demonstrated the presence of functional group vibrations originating from PEO and HCB, affirming the successful application of the freeze-drying method, which preserved the polymer content within the scaffold during the evaporation process, thus facilitating pore formation. The XRD results show that a lower CHA concentration is associated with a smaller size of the scaffold crystallites, potentially inducing dislocations favorable for cellular proliferation. The porosity of the formed scaffold is in the ideal range of >60% with CHA concentration of 5 and 10 wt%. The size of the pores that formed on the scaffold was 3–69 μm, classifying them within the micropore category. The in vitro test results in the form of an antibacterial test revealed that the scaffold could inhibit S. aureus and E. coli bacteria. Notably, a scaffold consisting of 10 wt% of CHA had a larger zone of inhibition diameter, 10.083 ± 0.104 for S. aureus and 10.517 ± 0.247 mm for E. coli. The MTT assay and cell morphology MC3T3E1 results in the scaffold show that the CHA/HCB/PEO scaffold is non-cytotoxic and can facilitate cells to attach and proliferate. The cell viability of the scaffold was 96.23% at the concentration of 31.25 μg ml−1, and the IC50 value was at 16144 μg ml−1. Therefore, CHA/HCB/PEO composites can be an alternative material in scaffold fabrication for bone tissue engineering.