Higher Killing Rate Research Articles

Pd nanocubes supported on the porous V2CTx nanosheets with enhanced nanozyme activity and photothermal property for antibacterial application

Rational design and controllable construction of supported nanostructures with excellent antibacterial property remain a great challenge. Recently, transition metal carbides/nitrides/carbonitrides (MXenes) have attracted much interest in many fields due to their large specific surface areas and good photothermal property. Herein, a simple yet effective surface engineering strategy based on the tuning of MXene surface chemistry is presented, which allows in-situ controlled growth of the Pd nanocubes on the V2CTx nanosheets. Briefly, the exfoliated V2CTx nanosheets by HF are annealed, which changes the composition of surface terminations while creating the mesoporous structures. The annealing largely affects the exposure and oxidation states of the adjacent V atoms and allows the controllable growth of Pd nanocubes. Interestingly, the obtained Pd@V2CTx nanocomposites show enhanced peroxidase-/oxidase-like activities and intrinsic photothermal effect in the near infra-red (NIR) region due to the strong metal-support interaction. Furthermore, the combined nanocatalytic-photothermal treatment by their versatilities remarkably improves the antibacterial efficacy, giving a high killing rate (above 98 % for both Escherichia coli and Staphylococcus aureus). This work provides a new avenue to develop the supported metal nanostructures based on MXenes for antibacterial application.

ELIMINATION OF BIOFILM PRODUCED BY ESCHERICHIA COLI AFTER EXPOSURE TO STRONTIUM SR90 AND CESIUM CS137 RADIOACTIVE SOURCE IN DIFFERENT DOSES

Objective:. The purpose of this research in order to remove biofilm produced from E. coli with different radioactive sources.Study design: Case–control in analytical and cross-sectional in descriptive study design. Backgrounds: The bacterium E. coli which is pathogenic to the urinary tract, depends on a wide number of virulence determinants, as it is the most important bacterium responsible for urinary tract infections. Radiation is power in the appearance of undulations or spout of mote. There are several types of radiance overall concerning us. Alpha dissolution occurs while the mote throw of the nucleus that constitute of two no and two P+. Beta dissolution a no is convert a P+ and an e- is released of the nucleus. Gamma dissolution happen through residuum power in the nucleus next alpha or beta dissolution or subsequent no catch (a kind of atomic response) in a nuclear reactor. Methodology: Study populations and bacterial isolates with diagnosing E. coli from catheter and several diseases from patients in Baghdad hospitals in 2023/ 2024. Expose the bacteria to radiance released of Sr90 and CS137 radioactive sources in various doses with screening biofilm production before and after exposure to radiation. Results: The results show that there is a high killing rate of E. coli during exposure to Cesium-90 and Cesium-137 radioactive sources. As well as loss of biofilm production at different doses. Conclusion: Firstly, the impact of radiance of various radioactive sources occasion the homicide of E. coli. Secondly, the impact of radiance released of radioactive sources in various doses is analogous in homicide of E. coli.

Biomimetic spray coating for fruit preservation based on UiO-1 67 metal–organic framework nanozyme

The application of edible coatings for preparing composite antibacterial spray coatings for fruit preservation by incorporating antibacterial nanoparticles has gained increasing attention. Chitosan (CS) is a natural polysaccharide used as an edible coating to preserve fruit; it has properties such as reducing water loss, enhancing appearance, and improving mechanical properties. By combining it with antibacterial material, it can reduce fruit microorganisms. Cerium (Ce) has excellent antibacterial activity combined with the advantages of safety and low cost. Therefore, this study proposes a biocatalytic spray coating for fruit preservation using a CS composite metal–organic framework (CS@Ce-MOF) with strawberry as a model fruit. CS@Ce-MOFs are superior to Ce-MOFs in the aqueous stability of their chemical structure, inoxidizability, antibacterial duration, and validity. The well-characterized CS@Ce-MOF was verified to simultaneously mimic good oxidase- and apyrase-like activities. CS@Ce-MOF biocatalytic spray coating demonstrated excellent antibacterial properties against two common foodborne pathogens: Escherichia coli and the Gram-positive bacterium Staphylococcus aureus, with high killing rates of up to 94.5%. This is due to the unique structure of the CS@Ce-MOF composite, which presents a large surface area for contact with pathogens and enhances the catalytic activity of the incorporated cerium oxide nanoparticles, leading to efficient sterilization. Furthermore, the scavenging rate of DPPH and ABTS free radicals is more than 80%, indicating that CS@Ce-MOF has excellent antioxidant properties. Moreover, CS@Ce-MOF minimized the weight loss and firmness of strawberries and bananas over 7 days of ambient storage. The use of such a biocatalytic spray coating has enormous potential for preserving the quality and safety of fresh produce, reducing food waste, and promoting sustainable agricultural practices.

Abstract 22: Development and characterization of human tumor specific cytotoxic lymphocytes for preclinical drug development

Abstract Heterogeneity within a tumor allows it to better adapt to changing conditions and can have therefore a negative impact on a patient’s prognosis, response to treatment and overall health. Breast cancer is a highly heterogeneous disease caused by distinct genetic mutations in mammary epithelial cells, resulting in significantly different forms of the disease and a need for highly personalized treatment schemes for patients. Hence, it is important to develop and improve (immuno)therapies for breast cancer patients. Adoptive T-cell therapy with autologous CD8+ cytotoxic T cell lymphocytes (CTL) is a promising method that has already shown promising effects in melanoma patients. Unfortunately, there is almost no information about the use in breast cancer patients. We developed an in vitro protocol to generate tumor-specific CTLs by priming on HER2+ breast cancer cell lines JIMT-1 and SKBR-3. Subsequently, these primed CTLs were tested in 2D and 3D immune cell killing assays in a life cell imaging device in combination with an endpoint viability assay. The activity was compared with unspecific CD8+T cells activated by phytohemagglutinin (PHA) or αCD2/αCD3/αCD28, HER2-peptide specific T cells and HER2-CAR T cells serving as a positive control. We investigated the feasibility to freeze CTLs for use in subsequent studies and validated the relevance of HER2 as the main druggable target in the tumor lines using an siRNA approach. The CTLs were most effective on JIMT-1 in a 3D setting, whereas the SKBR-3 CTLs displayed similar activity in 2D and in 3D. The respective CTLs were tumor line specific, as SKBR-3 CTLs did not kill efficiently the JIMT-1 cells and vice versa. The same CTLs displayed the same efficacy pattern after thawing but less pronounced. Thus, within one experimental set-up it is recommended to use either one. The Her2 knockdown in the target cells reduced the killing activity of the CTLs slightly. However, this effect was not statistically significant proving the importance of CTLs as treatment option as well as neoantigens as targets in drug development. In summary, the CTLs proved to capture the respective tumor heterogeneity showing high killing rates in both SK-BR3 and JIMT-1 being more active than HER2-peptide specific T cells. The availability of CTLs in a preclinical setting facilitates screening approaches for combinational studies. Beyond that they can serve as starting material to develop cancer vaccines and identify highly immunogenic neoantigens. Citation Format: Ina Rohleff, Lea Gröne, Kanstantsin Lashuk, Julia B. Schueler. Development and characterization of human tumor specific cytotoxic lymphocytes for preclinical drug development [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 1 (Regular Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(6_Suppl):Abstract nr 22.

Breathable, durable, flexible, and battery-free full action response electronic textiles toward simply achieving the function of human skin

Recently, the advantages of electronic textiles (e-textiles) for electronic skin have attracted great attention. As epidermal electronic products, they need to possess characteristics such as portability, comfortable to wear, durability, and easy to manufacture. However, in practical application scenarios, wearable electronics need to make trade-offs between various functions. Here, we propose a lightweight and breathable multi-functional electronic skin based on the idea of e-textiles, which employs an approach using nanogenerators (NGs), a simple electrospinning and three-dimensional printing (3D-print) process to fabricate a scalable, porous, and triboelectric-conductive-piezoelectric (T-C-P) multilayer structure-based electronic skin (e-skin) called TPSA. The piezoelectric-triboelectric hybrid nanogenerator exhibits remarkable electrical behavior due to its unique coupling enhancement effect. TPSA achieves excellent generating capacity (output of up to 105 kV/m2, 1.87 mA/m2, 29.4 mW/m2 in single-electrode working mode), enables full-scale human motion detection, achieves EMI shielding performance of 46.9 dB, possesses a high killing rate of Escherichia coli up to 99%, and exhibits good air permeability up to 35.453 cm3/(m2 *d*Pa). This electronic skin can perform some of the functions of the skin, quickly and without power monitoring of physiological signals and joint movements throughout the body, while ensuring comfort and protection. This work provides a strategy for easy access to versatile e-skins with excellent utility.

To Check Efficacy of Different Disinfectants by Kelsey Sykes Method

The incidence of hospital and community acquired infections has globally increased worldwide. The concentration of the disinfectants is important to give its higher efficacy against pathogens or microorganisms. Microorganisms are part of or environment cause major or severe diseases to reduce the risk of these diseases we generally clean surrounding by using cleaning agents like soaps, antiseptics or disinfectants. So to check weather these disinfectants are performs there work against specific bacteria or microorganism we performed this test to check the effectiveness of disinfectants against specific microorganism and fungus. Five bacterial types that are frequently acquired in hospitals from which two are gram positive organism, two are gram negative organism and single strain of fungus ‘(Pseudomonas aeruginossa, Klebsiella pneumoniae, Staphylococcus aureus (MRSA), Acinetobacter baumannii, Candida tropicalis) (clinical isolates) were examined for their susceptibility against 3 commonly used disinfectants hospitals Chlorine releasing agent, Quaternary ammonium compound and Aldehyde free disinfectant). The turbidity in the nutrient broth and the growth in culture media showed that all three disinfectants had lowered the microbial growth of every clinical strain. In general, the reference strains have lower growth and turbidity than the clinical strains. When combined, our results demonstrated that every product we examined had a high disinfection killing rate against microorganisms from various sources, indicating the excellent caliber of these goods. In response to rising disinfectant usage, hand sanitizer production has expanded to keep up with demand. Normal flora or microorganisms are part of our body in everyday life in which some are necessary some are unnecessary and can cause major or severe diseases to avoid from these diseases we generally clean our self and surrounding by using cleaning agents like soaps, antiseptics or disinfectants. So, to check weather these sterilizing agents are performed their work against specific bacteria or microorganism we performed this test to check the effectiveness of disinfectants against specific microorganism and fungus.

In Vitro Eradication of Planktonic, Saliva and Biofilm Bacteria Using Lingonberry Extract as a Photosensitizer for Visible Light Plus Water-Filtered Infrared-A Irradiation

Antimicrobial photodynamic treatment (aPDT) with visible light plus water-filtered infrared-A irradiation (VIS-wIRA) and natural single- or multi-component photosensitizers (PSs) was shown to have potent antimicrobial activity. The aim of this study was to obtain information on the antimicrobial effects of aPDT-VIS-wIRA with lingonberry extract (LE) against bacteria that play a role in oral health. Planktonic bacterial cultures of the Gram-positive E. faecalis T9, S. mutans DSM20523, S. oralis ATCC 35037 and S. sobrinus PSM 203513, the Gram-negative N. oralis 14F2 FG-15-7B, F. nucleatum ATCC 25586, and V. parvula DSM, the anaerobic F. nucleatum ATCC 25586 and V. parvula DSM 2008, and the total mixed bacteria from pooled saliva and supra- and subgingival plaques of volunteers were all treated and compared. aPDT-VIS-wIRA with LE as PS significantly (p < 0.008) reduced the growth of all tested Gram-positive, Gram-negative, as well as aerobic and anaerobic bacterial strains, whereas without irradiation no reductions were seen (p < 0.0001). NaCl, with or without irradiation, was ineffective. After treatment with CHX 0.2%, the highest killing rate (100%) was observed, and no bacteria (0 log10 CFU) were cultivable. The method also significantly reduced all of the bacteria present in saliva and in the gingival biofilms. Three-dimensional visualization of viable and non-viable microorganisms revealed that LE penetrated deeper into the cell wall layers than CHX 0.2%. LE was an appropriate PS for eradicating microorganisms with VIS-wIRA, either in their planktonic form or in saliva and gingival plaque biofilms. These results encourage further investigation in order to determine which LE compounds contribute to the photosensitizing effect and to evaluate the size of the effect on maintaining oral health.

Effect of Aspergillus flavus filtrate on different stages of Callosobruchus maculatus (Fabricius.) (Chrysomelidae: Coleoptera) on Broad beans

An experiment was conducted to use A.flavus filtrate in treating different stages of C.maculatus (eggs, larvae, pupae) after diluting it with sterile distilled water at concentrations 30%, 50%, 70% directly to calculate the killing rates after (1, 3, 5) days After treatment, the best results of egg inhibition were in the fifth day, with rates reaching 36.9, 53.7 and 83.87% respectively, and the best results of killing larvae were in the 3rd, 5th, and 5th day, respectively, with rates reaching 50.33, 80.47and 93.93% respectively, and the best results were Killing of the pupa in the 5th, 5th, and 5th day respectively, with rates that reached 63.50, 86.93and 96.97% respectively, and the best results of killing for adults were in the 3rd, 5th, and5th days respectively, with rates that reached 43.73, 90.83, and 93.93% respectively. The best results of killing were in the 1th, 3th, and 5th day respectively on adults of C. maculatus via the indirect method, as the highest killing rates were at the concentration of 70% and reached 56.83, 60.36 and 67.1% respectively, The best results were on the amount of laying eggs from an adult C. maculatus and by direct and indirect spraying on females. The results showed that the lowest rate of laying eggs for one female after three days of mating was zero eggs/female with a concentration of 70% compared to the indirect method which reached to 24.13 eggs/female.

Antimalarial Agents Targeting Plasmodium falciparum Carbonic Anhydrase: Towards Artesunate Hybrid Compounds with Dual Mechanism of Action.

Malaria continues to be a major public health challenge worldwide and, as part of the global effort toward malaria eradication, plasmodium carbonic anhydrases (CAs) have recently been proposed as potential targets for malaria treatment. In this study, a series of eight hybrid compounds combining the Artesunate core with a sulfonamide moiety were synthesized and evaluated for their inhibition potency against the widely expressed human (h) CAs I, II and the isoform from P. falciparum (PfCA). All derivatives demonstrated high inhibition potency against PfCA, achieving a KI value in the sub-nanomolar range (0.35 nM). Two Compounds showed a selectivity index of 4.1 and 3.1, respectively, against this protozoan isoform compared to hCA II. Three Derivatives showed no cytotoxic effects on human gingival fibroblasts at 50 μM with a high killing rate against both P. falciparum and P. knowlesi strains with IC50 in the sub-nanomolar range, providing a wide therapeutic window. Our findings suggest that these compounds may serve as promising leads for developing new antimalarial drugs and warrant further investigation, including activity against antimalarial-resistant strains, mode of action studies, and in vivo efficacy assessment in preclinical mouse models of malaria.

A plant leaf-mimicking film with tailored photodynamic antibacterial behavior for efficient preservation of perishable products

This work unveiled a novel biomimic visible light-harvesting film (NHC-Cur-CS) with exceptional photodynamic bactericidal activity to address the microbial spoilage of perishable products. This film was designed through a demand-oriented tailoring process that involved the integration of curcumin-loaded nitrogen-rich hollow/porous carbon fillers (NHC-Cur) and the skillful selection of chitosan (CS) matrix. The NHC-Cur-CS film boasts an impressive array of antibacterial features, including high killing rates (≥ 99.27%) and short processing times (20 min) upon visible light stimulation. The NHC-Cur-CS film has demonstrated commendable preservation performance, extending the shelf-life of citrus by up to 2.2 times. These desirable outcomes stem from the innovative designs: (i) the formation of Z-type heterojunction and hollow/porous structure bestow NHC-Cur with superior photodynamic activity, and (ii) the meticulous matching of NHC-Cur with CS mitigates the shortcomings of both materials in antibacterial process. These remarkable features highlight the potential of NHC-Cur-CS film for safeguarding perishable products effectively.

High killing rate of nematode and promotion of rice growth by synthetic volatiles from Bacillus strains due to enhanced oxidative stress response.

The plant parasitic nematode Aphelenchoides besseyi is a major pest that poses serious threats to different vegetables and crop plants. In the present study, volatiles isolated from Bacillus spp. were utilized as green biocontrol agents to overcome nematodes. In in vitro experiment, Bacillus spp. GBSC56, SYST2, and FZB42 showed the strongest nematicidal activity with killing rates of 80.78%, 75.69%, and 60.45%, respectively, as compared with control. The selected synthetic volatile organic compounds (VOCs), namely albuterol, benzaldehyde (BDH), 1,2-benzisothiazol-3(2H)-one (1,2-HIT), dimethyl disulfide (DMDS), 2-undecanone (2-UD), and 1,3-propanediole (1,3-PD), exhibited strong nematicidal activity, with A. besseyi killing rate of 85.58%, 82.65%, 81.75%, 80.36%, 84.45%, and 82.36%, respectively, at 400 μg/mL. Microscopic analysis proved that the rapid mortality was due to the production of reactive oxygen species (ROS). Molecular docking attributed this ROS production to the nematicidal effect of synthetic VOCs on NADH DEHYDROGENASE SUBUNIT 2, which is known to play a critical role in the suppression of ROS in nematode models. In a greenhouse experiment, the Bacillus strains GBSC56, SYST2, and FZB42 and their synthetic VOCs significantly improved the physiological parameters in terms of growth promotion traits. In addition, selected genes related to growth promotion and defense genes showed a significant upregulation of their expression in rice seedlings treated with those synthetic VOCs. Overall, these findings revealed that the selected Bacillus strains and their synthetic VOCs possess high potential against A. besseyi. Moreover, this study also sheds new light on the mechanisms by which specific Bacillus nematicidal VOCs influence important genes involved in rice plant growth promotion and could effectively be used to suppress plant parasitic nematodes.

Antibacterial Effectiveness of Chitosan Solution on Streptococcus Mutans

Dental caries is a localized destruction on teeth by organic acid produced by carbohydrate fermentation of cariogenic bacteria. Streptococcus mutans is a Gram-positive bacterium, a facultative anaerobe species often found in human oral cavity and is a significant contributor to dental caries. Chitosan is the collective name of a group of partially or fully deacetylated chitin. Because of its unique biological properties, including biodegradability and nontoxicity, a lot of applications have been found for chitosan, on its own or combined with other polymers. Chitosan has a wide spectrum of activity and high killing rate against Gram positive and Gram-negative bacteria, while having low toxicity against mammal cell. In this research a Kirby-Bauer test is done on Streptococcus mutans using 1%, 1.5%, and 2% chitosan solution as treatment group and aquades as control group. Average of each group is calculated and significancy is determined using statistical calculation. The resulting data is analyzed using Kruskal-Wallis and Post-hoc Tukey HSD and is shown there to be a significant difference between each treatment groups. The biggest zone of inhibition is seen on the 2% chitosan solution group. 2% chitosan solution has higher antibacterial effectiveness on Streptococcus mutans than 1% and 1.5% chitosan solution.

Magnetic porphyrin-based metal organic gel for rapid RhB removal and enhanced antibacterial activity by heterogeneous Photo-Fenton reaction under visible light.

Nanomaterials with visible light-driven catalytic ability are beneficial in controlling environmental pollutants. Porphyrin-based metal organic gel (MOG) was herein synthesized in one step and magnetic metal organic gel (MMOG) was successfully prepared via in-situ reaction of MOG and Fe3O4. This MMOG was developed as a novel visible light assisted Fenton-like catalyst. The catalytic experiments showed the high photo-Fenton activity of MMOG in the degradation of Rhodamine B (RhB) in the presence of visible light and H2O2 with a RhB degradation efficiency of 94.2% within 40min. Notably, the obtained MMOG can kill E. coli and S. aureus with high killing rate (>99.999%) under visible light. Importantly, the MMOG can be recovered simply by an external magnetic field due to the unique magnetic property. This easily synthesized MMOG with photo-Fenton activity under visible light and magnetic property makes MOG based on the photo-Fenton reaction a prospective material for the environmental and biomedical applications.

Prey defence phenotype mediates multiple-predator effects in tri-trophic food webs.

The emphasis on mechanisms governing the interaction among predators (e.g. cooperation, competition or intraguild predation) has driven the understanding of multiple-predator effects on prey survival and dynamics. However, overwhelming evidence shows that prey can adaptively respond to predators, exhibiting multiple defensive phenotypes to cope with predation. Nevertheless, there is still a relatively scarce theory connecting the emergence of prey defences in complex multi-predator scenarios and their ecological consequences. Using a mathematical approach, we evaluated the prevalence of defended prey phenotypes as a function of predator-induced mortality in a two-predator system, and how prey and phenotype dynamics affect trophic cascades. We also evaluated such responses when prey manifests a general defence against both predators (i.e. risk reducing) or a specialized defence against one predator at the expense of defence against the other predator (i.e. risk trade-off), and when such phenotypes induce fitness and foraging costs. We showed that the emergence of defended phenotypes under multiple predators depends on predator-induced mortality rates, the magnitude of phenotype costs and the effect of the defensive phenotype on the performance of all predators. Risk-reducing phenotypes enhance prioritized responses to predators with high killing rates, but prioritized responses are diminished when prey manifest risk trade-off phenotypes. Finally, we showed that resource abundance across the predation gradient directly depends on the prevalence of certain prey phenotypes and their effect on foraging costs. Ultimately, our results depict the implications of prey defences on prey and basal resources abundance in a multiple predators' environment, highlighting the role of the identity of defensive strategies in mediating the strength and nature of trophic cascades, via consumptive or non-consumptive effects.

A Small-Molecule Inhibitor of the Anthranilyl-CoA Synthetase PqsA for the Treatment of Multidrug-Resistant Pseudomonas aeruginosa.

ABSTRACTOne of the challenges associated with the treatment of Pseudomonas aeruginosa infections is the high prevalence of multidrug resistance (MDR). Since conventional antibiotics are ineffective at treating such bacterial infections, innovative antibiotics acting upon novel targets or via mechanisms are urgently required. In this study, we identified a quorum sensing inhibitor (QSI), norharmane, that uniquely shows weak antibacterial activity but strongly inhibits pyocyanin production and biofilm formation of MDR P. aeruginosa. Biophysical experiments and molecular docking studies showed that norharmane competes with anthraniloyl-AMP for anthranilyl-CoA synthetase PqsA of P. aeruginosa at the ligand-binding pocket, which is not exploited by current inhibitors, thereby altering transcription regulatory activity. Moreover, norharmane exhibits synergy with polymyxin B. This synergism exhibits a high killing rate, low probability of resistance selection, and minimal cytotoxicity. Notably, norharmane can effectively boost polymyxin B activity against MDR P. aeruginosa-associated infections in animal models. Together, our findings provide novel insight critical to the design of improved PqsA inhibitors, and an effective combination strategy to overcome multiantibiotic bacterial resistance using conventional antibiotics and QSIs.IMPORTANCE Pseudomonas aeruginosa is a dominant hospital-acquired bacterial pathogen typically found in immunocompromised individuals. It is particularly dangerous for patients with chronic lung diseases and was identified as a serious threat for patients in the 2019 Antimicrobial Resistance Threats report (https://www.cdc.gov/drugresistance/biggest-threats.html). In this study, we used activity-based high-throughput screening to identify norharmane, a potent and selective inhibitor of P. aeruginosa PqsA, which is a well-conserved master quorum sensing (QS) regulator in multidrug resistant (MDR) P. aeruginosa. This compound competitively binds anthranilyl-CoA synthetase PqsA at the anthraniloyl-AMP binding domain, which has not been exploited by known inhibitors. Remarkably, norharmane can significantly block the production of the virulence factor, pyocyanin (87%), and biofilm formation (80%) in MDR P. aeruginosa. Furthermore, norharmane is capable of augmenting polymyxin B activity against MDR P. aeruginosa in cell cultures and animal models. Taken together, these results suggest that norharmane may be an effective adjuvant for combating multiantibiotic bacterial resistance.

Isolation of Entomopathogenic Lysinibacillus sphaericus from Sewage at Some Housing Complex in Mataram City and Evaluation of Its Toxicity Against Aedes aegypti Larvae in Laboratory

The aims of this study were to isolate Lysinibacillus sphaericus from sewage at some housing complex in Mataram city and evaluate its toxicity against third Aedes aegypti larvae. The bacteria collected from mud taken from diluted sewage and objected to heat shock procedure at 80ºC for 30 minutes. The microbiological culture was done using a Nutrient Agar solid medium and incubated at 30ºC for 72 hours. Bacterial characterization was done based on bacterial colony morphology, cell morphology, cell physiology, and cell biochemistry characteristics. Toxicity test on 3rd Aedes aegypti larvae was done for 24, 48, and 72 hours applying Nutrient Broth medium with various dilution. From this study total of 11 isolates of Lysinibacillus sphaericus were isolated, only three isolates showed a high killing rate against Ae. aegypti in 24-hour observation. They were isolate Bs9-2-3 (LC50 24-hour value was 1.75 x 104 cell/mL), isolate Bs9-1-5 (LC50 24-hour value was 6.23 x 104 cell/mL) and isolate Bs2-1-2 (LC50 24-hour value was 7.17 x 106 cell/mL). These local isolates of L. sphaericus had good potential to be developed for bacterial-based biopesticide/biolarvicide for battling Aedes mosquito larvae in the near future.

Dietary preference for Oryzaephilus surinamensis and the role of the microwave in the control of the larval and complete phase

The study conducted to find out the degree of nutritional preference for Oryzaephilus surinamensis , On three types of dates, which are brim, ascetic, and defecation, in addition to the role of micro-rays in controlling the larval and full phase of the Saw-grain beetle, As the results showed that the best type of dates is the ascetic seed, as the number of insect fed to it reached 121 adults and 30 larvae, while the lowest number of insects in the brim was 8 insects. As for the role of micro-rays, in which the insect was exposed to the larval and complete stage for 20, 40, 60 seconds, and the highest killing rate in larvae and adults was 100% at the exposure period of 60 seconds, while it was 80% at the exposure period of 20 seconds in the adults and 90% in the larvae.

In Vitro Anticancer Ability of Nano Fluorescent 111 In-MIL-68/PEG-FA on Hela Cells.

In past decades, nanoscale metal-organic frameworks (NMOFs) have drawn more and more attention in multimodal imaging and targeting therapy of various malignant cancers. Here, we proposed to dope 111 In into fluorescent In-based NMOFs (In-MIL-68-NH2 ), with an attempt to prepare a new nanomedicine with great anticancer potential. As a proof of concept, the obtained NMOF (In-MIL-68/PEG-FA) with targeting motifs is able to act as a fluorescent probe to achieve Hela cell imaging. Moreover, the Auger electron emitter 111 In built in corresponding radioactive NMOF (111 In-MIL-68/PEG-FA) can bring clear damage to cancer cells, leading to a high cell killing rate of 59.3 % within 48 h. In addition, the cell cycle presented a significant dose-dependent G2/M inhibiting mode, which indicates that 111 In-MIL-68/PEG-FA has the ability to facilitate the cancer cells to enter apoptotic program. This work demonstrated the potential of 111 In-labelled NMOFs in specific killings of cancer cells, providing a new approach to develop nanomedicines with theranostic function.

Beta Lactams Plus Daptomycin Combination Therapy for Infective Endocarditis: An Italian National Survey (BADAS).

Background: infective endocarditis (IE) remains a severe disease frequently encountered in clinical practice and often requiring interdisciplinary medical and surgical management. This national survey aims to describe the clinical prescribing habits of the use of daptomycin in the setting of IE and the possible role for combination therapy with beta-lactams. Methods: The study was a cross-sectional internet-based questionnaire survey on therapy with daptomycin. The questionnaire was designed with closed-ended questions and distributed using the SurveyMonkey® platform between October 2019 to December 2020. Results: 55 clinicians from twelve Italians regions joined the questionnaire. The survey reported use of daptomycin as first-line choice in 31.48% of cases and as the first-line anti-MRSA agent in 44.44%. The empiric use of daptomycin was stated in the high suspicion of MRSA rather than MSSA, enterococcal or streptococcal IE. The rationale of daptomycin for the empirical treatment of native and prosthetic valve IE was mostly the possibility of administering an aminoglycoside-sparing combination regimen, high bacterial killing rate and high clinical efficacy. Conclusions: In conclusion, in selected patients, daptomycin could be a feasible option for the treatment of infective endocarditis in line with data from the European registry of daptomycin.

Engineering a photosynthetic bacteria-incorporated hydrogel for infected wound healing

Treating wounds with multidrug-resistant bacterial infections remains a huge and arduous challenge. In this work, we prepared a “live-drug”-encapsulated hydrogel dressing for the treatment of multidrug-resistant bacterial infections and full-thickness skin incision repair. Our live dressing was comprised of photosynthetic bacteria (PSB) and extracellular matrix (ECM) gel with photothermal, antibacterial and antioxidant properties, as well as good cytocompatibility and blood compatibility. More interestingly, live PSB could be regarded as not only photothermal agents but also as anti-inflammatory agents to promote wound healing owing to their antioxidant metabolites. In vitro and in vivo studies showed that the PSB hydrogel not only had a high killing rate against methicillin-resistant Staphylococcus aureus (MRSA) but it also accelerated collagen deposition and granulation tissue formation by promoting cell proliferation and migration, which significantly promoted skin tissue regeneration and wound healing. We believe that the large-scale production of PSB Gel-based therapeutic dressings has the advantages of easy use and promising clinical applications. Statement of significanceRapid wound healing and the treatment of bacterial infections have always been the two biggest challenges in the field of wound care. We prepared a “live drug” dressing by encapsulating photosynthetic bacteria into an extracellular matrix hydrogel to sterilize the wound and promote wound healing.First, photosynthetic bacteria are not only a photothermal agent for photothermal wound sterilization, but also possess the anti-inflammatory capacity to enhance wound healing due to their antioxidant metabolites. Second, the extracellular matrix hydrogel is rich in a variety of growth factors and nutrients to promote cell migration and accelerate wound healing. Third, photosynthetic bacteria are not only green and non-toxic, but also can be obtained on a large scale, which facilitates manufacturing and clinical transformation.