Bacterial Growth Research Articles

Kandungan Fitokimia Daun Asam Jawa dan Potensinya sebagai Bioagen Antibakteri untuk Pengobatan Alami

Indonesia is known as a country that is abundant in various biological riches and their potential as medicines, so a review of natural antidiarrheal treatment methods using tamarind leaves was carried out. Diarrhea is a digestive disorder with a high prevalence rate, especially in developing countries. Diarrhea is a digestive system disorder characterized by stomach cramps, a liquid stool consistency, and an increase in the frequency of defecation more than 3 times in 24 hours. The research method used is to use literature review through online publications based on the Web, ResearchGate, Google Scholar and Scopus. The research sample used in this literature review was 22 articles. The research results show that the phytochemical content of tamarind consists of tannins, flavonoids, saponins, alkaloids, phenols and triterpenoids. The results of the analysis in the literature review show that tamarind leaves are an alternative natural treatment and are effective in inhibiting the growth of bacteria, for example the Escherichia coli bacteria that causes diarrhea.

Effect of Retort Processing on the Microbiological, Sensory Evaluation and Physicochemical properties of the Ready-To-Eat Grilled Beef

Retort processing is a method of preserving food by heating it in hermetically sealed containers like cans, glass jars and retortable pouches. Objective: The objective of this paper is to look at the effect of retort processing on grilled beef in retort pouches for microbiological, physicochemical, and sensory quality.  Materials and Methods: Ready-to-eat (RTE) grilled beef was thermally processed at different Fo values (sterilization unit) of 8, 10 and 12 at the temperature of 121 °C. Before the thermal process, beef was marinated and grilled at 200 °C, for 20 min. The filled and sealed pouches were then subjected to retort processing for optimizing the Fo value at process temperature. Grilled beef without a retort process is subjected to a control sample. The effect of different Fo values on the microbiological (total plate count, yeast& mould, Ecoli, coliform. Salmonella and staph aureus) sensory evaluation and physicochemical properties were evaluated. Results: Results on the microbial analysis showed that there is no growth of bacteria for all Fo values tested. The sensory evaluation scored the highest for the product processed at 121 °C, Fo 12 for overall acceptance attributes. For moisture analysis, as the Fo value increases the moisture content decreases. Retort processed grilled beef had significantly lower L*, a* and b* values as the Fo value increases. Conclusion: It is concluded that grilled beef product retorted to Fo 12, 121 °C, had acceptable microbiological limits, highest score of organoleptic evaluation and acceptable physicochemical characteristics.

Furosemide Derails Human Lysozyme Fibrillation by Interacting with Aggregation Hot Spots: A Biophysical Comprehension.

Kidney-associated human lysozyme amyloidosis leads to renal impairments;thus, patients are often prescribed furosemide. Based on this fact, the effect of furosemide on induced human lysozyme fibrillation, in vitro, is evaluated by spectroscopic, calorimetric, computational, and cellular-based assays/methods. Results show that furosemide increases the lag phase and decreases the apparent rate of aggregation of human lysozyme, thereby decelerating the nucleation phase and amyloid fibril formation, as confirmed by the decrease in the level of Thioflavin-T fluorescence. Fewer entities of hydrodynamic radii of ∼171 nm instead of amyloid fibrils (∼412 nm) are detected in human lysozyme in the presence of furosemide by dynamic light scattering. Moreover, furosemide decreases the extent of conversion of the α/β structure of human lysozyme into a predominant β-sheet. The isothermal titration calorimetry established that furosemide forms a complex with human lysozyme, which was also confirmed through fluorescence quenching and computational studies. Also, human lysozyme lytic activity is inhibited competitively by furosemide due to the involvement of amino acid residues of the active site in catalysis, as well as complex formation. Conclusively, furosemide interacts with Gln58, Ile59, Asn60, Ala108, and Trp109 of aggregation-prone regions 2 and 4 of human lysozyme, thereby masking its sites of aggregation and generating only lower-order entities that are less toxic to red blood cells than the fibrils. Thus, furosemide slows the progression of amyloid fibrillation in human lysozyme.

Co-fermentation exploiting glucose and xylose utilizing thermotolerant S. cerevisiae of highly lignified biomass for biofuel production: Statistical optimization and kinetic models

The present study assesses the potential of co-fermentation for the enhanced production of biofuels from a highly lignified biomass, Viz., Pomegranate Peel (PP) and Mosambi Peel (PP). The simultaneous saccharification and co-fermentation (SScF) on brewer's yeast Saccharomyces cerevisiae and modified strain S. cerevisiae XUSE were used for the ethanol production using RSM. The Box-Behnken design (BBD) model was used to execute 15 runs with independent factors of initial pH (5.5, 6.5, 7.5), yeast concentration (4%, 5% and 6%v/v), and co-culture yeast concentration (4%, 5% and 6%v/v). The highest bioethanol production was achieved by PP (35.460 ± 0.32 g/L) and MP (25.630 ± 0.40 g/L) on optimal variables of pH 6.5, with yeast concentration (5% v/v) and co-culture yeast concentration (5% v/v) for 120 hrs duration. Furthermore, the kinetic of logistic and modified Gompertz model analyzed the lag phase of PP and MP was 7.9 and 7.15 h, for which maximum bioethanol production (EtOH max-Pm) reported for PP (38.62 g/L) and MP (29.21 g/L), respectively. The study infers that SScF has great potential for producing high-titer ethanol commercially and supports waste-to-energy strategies.

Comparative transcriptomic profiling of the two-stage response of rice to Xanthomonas oryzae pv. oryzicola interaction with two different pathogenic strains.

Two-tiered plant immune responses involve cross-talk among defense-responsive (DR) genes involved in pathogen-associated molecular pattern (PAMP)-triggered immunity (PTI), effector-triggered immunity (ETI) and effector-triggered susceptibility (ETS). Bacterial leaf streak (BLS), caused by Xanthomonas oryzae pv. oryzicola (Xoc) is an important bacterial disease that causes serious threats to rice yield and quality. Transcriptomic profiling provides an effective approach for the comprehensive and large-scale detection of DR genes that participate in the interactions between rice and Xoc. In this study, we used RNA-seq to analyze the differentially expressed genes (DEGs) in susceptible rice after inoculation with two naturally pathogenic Xoc strains, a hypervirulent strain, HGA4, and a relatively hypovirulent strain, RS105. First, bacterial growth curve and biomass quantification revealed that differential growth occurred beginning at 1day post inoculation (dpi) and became more significant at 3 dpi. Additionally, we analyzed the DEGs at 12h and 3 days post inoculation with two strains, representing the DR genes involved in the PTI and ETI/ETS responses, respectively. Gene Ontology (GO) functional and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analyses were performed on the common DEGs, which included 4380 upregulated and 4019 downregulated genes and 930 upregulated and 1383 downregulated genes identified for the two strains at 12h post inoculation (hpi) and 3 dpi, respectively. Compared to those at 12 hpi, at 3 dpi the number of common DEGs decreased, while the degree of differential expression was intensified. In addition, more disease-related GO pathways were enriched, and more transcription activator-like effector (TALE) putative target genes were upregulated in plants inoculated with HGA4 than in those inoculated with RS105 at 3 dpi. Then, four DRs were randomly selected for the BLS resistance assay. We found that CDP3.10, LOC_Os11g03820, and OsDSR2 positively regulated rice resistance to Xoc, while OsSPX3 negatively regulated rice resistance. By using an enrichment method for RNA-seq, we identified a group of DEGs related to the two stages of response to the Xoc strain, which included four functionally identified DR genes.

Fungal Bioremediation of the β-Lactam Antibiotic Ampicillin under Laccase-Induced Conditions

Due to widespread overuse, pharmaceutical compounds, such as antibiotics, are becoming increasingly prevalent in greater concentrations in aquatic ecosystems. In this study, we investigated the capacity of the white-rot fungus, Coriolopsis gallica (a high-laccase-producing fungus), to biodegrade ampicillin under different cultivation conditions. The biodegradation of the antibiotic was confirmed using high-performance liquid chromatography, and its antibacterial activity was evaluated using the bacterial growth inhibition agar well diffusion method, with Escherichia coli as an ampicillin-sensitive test strain. C. gallica successfully eliminated ampicillin (50 mg L−1) after 6 days of incubation in a liquid medium. The best results were achieved with a 9-day-old fungal culture, which treated a high concentration (500 mg L−1) of ampicillin within 3 days. This higher antibiotic removal rate was concomitant with the maximum laccase production in the culture supernatant. Meanwhile, four consecutive doses of 500 mg L−1 of ampicillin were removed by the same fungal culture within 24 days. After that, the fungus failed to remove the antibiotic. The measurement of the ligninolytic enzyme activity showed that C. gallica laccase might participate in the bioremediation of ampicillin.

Antibacterial, Phytochemical and Toxicological Activities of Garcinia kola Extracts against Multidrug Resistant Clinical Bacteria

Objective: The rise in multiple antibiotic resistant microorganisms has led to a decline in the efficacy of many antibiotics, prompting the investigation of alternative solutions such as medicinal plants. To tackle this concerning issue, this study was undertaken to evaluate the phytochemical composition, antibacterial activity, and toxicological characteristics of Garcinia kola extracts against multidrug-resistant bacteria commonly found in clinical settings. Material-Method: The cold maceration technique was employed to extract the root and leaf of Garcinia kola using water and methanol. The extracts were then subjected to phytochemical screening. To evaluate the extracts' potential to inhibit bacterial growth, five multidrug-resistant isolates were utilized in this study. Agar well assay was used to determine the zones of inhibition. The Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) were determined using the broth macro dilution technique. Additionally, Brine shrimp lethality assay was conducted to determine the lethal concentration (LC50) of the extracts. The extracts were also combined for synergism. Results: The investigation found that the root extract in methanol had the highest yield at 25.58%. All four extracts contained ten out of the fourteen tested phytochemicals. The methanol leaf and root extracts exhibited the highest and lowest inhibition zones of 20mm and 9mm against Staphylococcus aureus, respectively. The MIC values ranged from 250 to 600 mg/ml, indicating broad-spectrum antibacterial activity. The cytotoxicity test showed a range of 33.03 to 126.3µg/mL for the aqueous and methanol extracts. Conclusion: Although Garcinia kola shows potential as a source of antibacterial compounds, caution should be exercised due to its toxic effects.

Новий метаболіт Myrothecium cinctum 910 трихотеценової природи та його біологічні властивості

Fungi of the Myrothecium genus are well-known producers of macrocyclic trichothecenes, characterized by the acute toxic effect on warm-blooded organisms and fungicidal action against a wide range of fungi. At the same time, as established by us earlier, M. cinctum (current name Striaticonidium cinctum) 910 shows a wide spectrum of antibacterial activity: along with antifungal activity against mycelial, yeast-like and phytopathogenic test-cultures it strongly inhibited the growth of gram-positive test-strains and to lesser extend – the growth of gram-negative and phytopathogenic bacteria. This strain also revealed significant phytotoxic potential suppressing the growth of green algae Chlorella strains. The aim of the work was to isolate, to purify and to obtain in crystalline form the biological active metabolites of M. cinctum 910 and to study their physicochemical characteristics and biological activity. Methods. To obtain biologically active metabolites in the purified crystalline form, the extraction followed by separation by column chromatography and recrystallization was used; physicochemical methods and microbiological tests were used for characterization of their properties. Results. Three substances which showed the wide spectrum of biological activity to indicator test-cultures were obtained in crystalline form: preparation МС910 with high antibiotic activity and preparations from fractions 8/2 and 9 with high antifungal and phytotoxic activities. Taking into account the data of spectroscopy in the UV-range of spectrum, of spectrums of antibiotic activity and of qualitative reaction with 4-(4-nitrobenzyl)pyridine, it can be concluded that active fractions  8/2 and  9 contain macrocyclic trichothecenes whereas the metabolite МС910 (which is proved by data of IR-spectroscopy) belongs to simple trichothecenes – substances like to macrocyclic trichothecenes but without macrocyclic fragment in their structure. Conclusions. Antibiotic properties of M. cinctum 910 are due to the complex of biological active metabolites with different biological and physicochemical properties. In view on the biological activity of MC910, it can be argued that it has atypical for trichothecenes, including macrocyclc trichothecenes, antibacterial properties as well as it is non-toxic and does not reveal dermatocidal activity in studied concentrations. Therefore, we assume that MC910 is new, not described earlier metabolite of trichothecene nature, which needs further studies. At the same time, active metabolites from fractions 8/2 and 9 are represented by macrocyclic trichothecenes, which is also indicated by the spectra of their biological activity.

Short-Chain Carboxylates Facilitate the Counting of Yeasts in Sub-High Temperature Daqu.

Sub-high temperature Daqu, a traditional solid fermenting agent used in Chinese strong-aroma Baijiu production, is abundant in diverse microorganisms, including bacteria, yeasts, molds, and actinomycetes. Among these, yeasts are pivotal for ethanol production and flavor formation. However, counting yeasts in Daqu is challenging due to interference from molds and bacteria. Antibiotics are employed to inhibit bacterial growth, but there is no practical way to suppress molds without affecting the growth of yeasts. In this study, short-chain carboxylates (C1-C6) were added to the culture medium at various pH conditions to investigate their effects on the growth of molds and yeasts. The results demonstrated distinct inhibitory effects of the short-chain carboxylates, depending on both pH and concentration. Several tested short-chain carboxylates effectively suppressed mold growth on agar plates while leaving yeast growth unaffected. This suggests a simple and feasible method for enhancing the efficiency of yeast isolation and counting in Daqu. Such an approach is valuable for studying yeasts in diverse and complex habitats.

A novel integrated membrane bioreactor-stirred tank bioreactor system for simultaneous biodegradation of bisphenol A contaminated wastewater and biopolyol production: An approach towards circular bioeconomy

The present work examined the biodegradation of bisphenol A (BPA) under batch and continuous modes using hydrocarbonoclastic bacterium, Pseudomonas aeruginosa PR3. The strain showed great biodegradation potential under batch shake flask and stirred tank reactor. Bacterial growth was considerably inhibited at initial BPA concentrations > 50 mg/L. Further, membrane bioreactor (MBR) for BPA biodegradation was also evaluated under different inlet BPA concentration and hydraulic retention time (HRT) and the maximum BPA removal efficiency of 94.4 % was attained with an influent BPA concentration of 25 mg/L at 5 d of HRT. MBR also showed better performance under shock loading conditions. Identification of BPA biodegraded pathways was also performed using liquid chromatography-mass spectrometry, elucidating the different metabolites and end products formed. A subsequent enhancement in BPA removal efficieny was also observed owing to the microfiltration system of MBR that was applied to separate bacterial biomass from effluent. The maximum removal efficiency was further enhanced to 98.5 % under the same operational schedule. As the strain has the ability to produce extracellular diol synthase enzyme which transforms oleic acid into the biopolyol 7,10-dihydroxy-8(E)-octadecenoic acid, the effluent containing the enzymes was supplemented with 1 % (v/v) oleic acid under whole cell and cell-free approaches. Cell-free technique showed an enhanced bioconversion efficiency in comparison to the traditional whole cell approach. Further, the produced biopolyol was characterized using Fourier transform infrared spectroscopy, thermogravimetry, differential scanning calorimetry, and 1H nuclear magnetic resonance analyses and also depicted the antibacterial activity.

Synthesis, antifungal activity and action mechanism of novel citral amide derivatives against Rhizoctonia solani.

Rice sheath blight caused by Rhizoctonia solani is a severe threat to the yield and quality of rice. Due to the unscientific abuse of common fungicides causing resistance and environmental issues, the development of new fungicides is necessary. In this study, we used citral as the lead compound, designed and synthesized a series of novel citral amide derivatives, and evaluated their antifungal activity and mode of action against R. solani. Bioassay results indicated that antifungal activities of most citral amide derivatives against R. solani were significantly improved compared to citral, with EC50 values ranging from 9.50-27.12 mg/L. Among them, compound d21 containing the N-(Pyridin-4-yl)carboxamide group exhibited in vitro and in vivo fungicidal activities, with curative effects at 500 mg/L as effectively as the commercial fungicide validamycin·bacillus. Furthermore, d21 prolonged lag phase of the growth curve of R. solani, reduced the amount of growth, and inhibited sclerotium germination and formation. Mechanistically, d21 deformed the mycelia, increased cell membrane permeability, and inhibited the activities of antioxidant and TCA-related enzymes. Metabolome analysis showed the abundance of some energy-related metabolites within R. solani increased, and simultaneously the antifungal substances secreted by itself reduced. Transcriptome analysis showed that most genes encoding ABC transporters and peroxisomes upregulated after the treatment of d21, and cell membrane destruction. This study indicates that novel citral amide derivatives possess antifungal activity against R. solani and are expected to develop an alternative option for chemical control of rice sheath blight. This article is protected by copyright. All rights reserved.

Characterization of Escherichia coli pathogenicity and drug resistance in yolk peritonitis

Yolk Peritonitis can lead to a rapid decline in egg production, which seriously affects the health of laying hens and the profitability of chicken farms. Escherichia coli (E. coli) is the most common cause of yolk peritonitis in laying hens. In this study, bacterial samples were collected from the ovaries and fallopian tubes of laying hens with suspected yolk peritonitis from a laying farm in Jiangsu Province, and their pathogenicity and drug resistance were investigated. Initially, morphological and biochemical detection methods were employed to isolate and identify the pathogenic bacteria. The results showed that a total of 16 strains of E. coli were isolated from laying hens with yolk peritonitis. Subsequently, the drug resistance and pathogenicity of a randomly selected E. coli strain were analyzed and predicted by genome sequencing technology, and the drug resistance of E. coli was verified by drug sensitivity test and PCR. Finally, the virulence was verified by infection experiment in mice. The study revealed that the egg-yolk peritonitis in laying hens was caused by E. coli infection, and the genome sequencing analysis revealed that the bacteria had multidrug resistance and high virulence. The drug susceptibility testing indicates that E. coli exhibited resistance to aminoglycosides, β-lactam, macrolides, fluoroquinolones, and sulfonamides. In this study, resistance genes including KdpE, aadA5, APH(3 ")-ID, APH(6)-ID, and TEM-1 were identified, and their expression levels varied across different stages of bacterial growth. The results of virulence analysis indicated a mortality rate of 50% in mice infected with E. coli at a concentration of 2.985 × 107 CFU/mL. E. coli infection resulted in damage to various tissues and organs in mice, with the intestinal tissue structure being the most severely affected. This study provides a reference for the study of drug resistance mechanisms in E. coli and provides valuable insights into the selection of drugs for the treatment of vitelline peritonitis.

Synthesis, in vitro and in silico screening of novel ferrocenyl substituted cyclohexenone and indazole derivatives as effective antimycobacterial agents

In response to the escalating threat of mycobacterial infections, including extensively drug-resistant tuberculosis (XDR) and multidrug-resistant tuberculosis (MDR), we synthesized novel ferrocene incorporating cyclohexenone and indazole derivatives. The compounds were synthesized via multistep reaction approach starting from chalcone precursors and evaluated against Mycobacterium fortuitum. The MIC and MBC values were calculated by following CLSI guidelines, with a focus on their ability to inhibit bacterial growth and disrupt biofilm formation. All the test compounds showed potent in vitro antimycobacterial activity against M. fortuitum. The MIC values range from 3.907 µg/mL to 500 µg/mL, whereas the MBC values range from 15.625 µg/mL to >500 µg/mL. Among the synthesized compounds, compound 3b exhibited potent antimycobacterial activity compared with standard drug Amikacin used to treat multidrug-resistant tuberculosis. 3b demonstrated significant inhibition of bacterial growth and showed the capacity to effectively suppress biofilm formation and disrupt pre-existing biofilms. This molecule also displayed favourable ADMET profile and good oral bioavailability, besides showing potential interactions with the target enzyme as revealed by docking studies and validated by enzyme assay. Collectively, these studies position 3b as a potential lead molecule that could be further optimized to develop ferrocene incorporating indazole based antimycobacterial agents.

Evaluation of Antimicrobial Properties in Coatings for Operating Room Surfaces

This article highlights the crucial significance of upholding sterility in operating rooms (ORs) to minimize infection risks and uphold patient safety. Putting a spotlight on the pivotal role of antimicrobial coatings, the research delves into the examination of four frequently used coatings—polyurethane, acrylic, alkyd, and epoxy—across various surfaces within ORs. The study evaluates the antimicrobial properties of these coatings against 20 contaminant bacteria, uncovering diverse impacts on different strains. While these coatings may not inherently possess antimicrobial characteristics, formulations enriched with agents like 1,2-benzisothiazol-3(2H)-one (BIT) and 2-octyl-2H-isothiazol-3-one (OIT) demonstrate active resistance against bacterial growth. The results highlight the efficacy of acrylic and epoxy coatings, specifically in impeding bacterial proliferation. These findings affirm the practical utility of antimicrobial coatings in vital healthcare settings, providing valuable insights into their potential to elevate hygiene, safety, and efficiency in ORs. The study advocates for ongoing exploration of innovative coatings and antimicrobial agents, underscoring the importance of adhering to cleaning protocols and healthcare regulations for optimal effectiveness.

Harnessing the Potential of Extracellular Polymeric Substances in Enhancing ANAMMOX Processes: Mechanisms, Strategies, and Perspectives

Anaerobic ammonium oxidation (ANAMMOX) has emerged as a promising sustainable nitrogen removal technology that offers significant advantages over conventional nitrification–denitrification processes, such as reduced energy consumption, a 60% reduction in oxygen demand, and a 90% reduction in sludge production. However, the practical application of ANAMMOX is hindered by several challenges, including the slow growth of ANAMMOX bacteria, long start-up periods, and high sensitivity to environmental disturbances. Recent studies have highlighted the crucial role of extracellular polymeric substances (EPSs) in the formation, activity, and stability of ANAMMOX biofilms and granules. An EPS is a complex mixture of high-molecular-weight polymers secreted by microorganisms, mainly composed of polysaccharides, proteins, nucleic acids, and lipids. The diverse physicochemical properties and functional groups of EPSs enable them to serve as a structural scaffold, protective barrier, sorption site, electron shuttle, and nutrient source for ANAMMOX bacteria. This review aims to provide an overview of the latest research progress on harnessing the potential of EPSs to enhance the ANAMMOX process. The characteristics, compositions, and extraction methods of ANAMMOX-derived EPSs are summarized. The mechanisms of how EPSs facilitate the enrichment, immobilization, aggregation, and adaptation of ANAMMOX bacteria are elucidated. The strategies and effects of EPS supplementation on improving the performance and robustness of ANAMMOX reactors under various stresses are critically reviewed. The challenges and future perspectives of the EPS-mediated optimization of the ANAMMOX process are also discussed. This review sheds new light on exploiting EPSs as a renewable bioresource to develop more efficient and stable ANAMMOX applications for sustainable wastewater treatment.

SCPL acyltransferases catalyze the metabolism of chlorogenic acid during purple coneflower seed germination.

The metabolism of massively accumulated chlorogenic acid is crucial for the successful germination of purple coneflower (Echinacea purpurea (L.) Menoch). A serine carboxypeptidase-like (SCPL) acyltransferase (chicoric acid synthase, CAS) utilizes chlorogenic acid to produce chicoric acid during germination. However, it seems that the generation of chicoric acid lags behind the decrease in chlorogenic acid, suggesting an earlier route of chlorogenic acid metabolism. We discovered another chlorogenic acid metabolic product, 3,5-dicaffeoylquinic acid, which is produced before chicoric acid, filling the lag phase. Then, we identified two additional typical clade IA SCPL acyltransferases, named chlorogenic acid condensing enzymes (CCEs), that catalyze the biosynthesis of 3,5-dicaffeoylquinic acid from chlorogenic acid with different kinetic characteristics. Chlorogenic acid inhibits radicle elongation in a dose-dependent manner, explaining the potential biological role of SCPL acyltransferases-mediated continuous chlorogenic acid metabolism during germination. Both CCE1 and CCE2 are highly conserved among Echinacea species, supporting the observed metabolism of chlorogenic acid to 3,5-dicaffeoylquinic acid in two Echinacea species without chicoric acid accumulation. The discovery of SCPL acyltransferase involved in the biosynthesis of 3,5-dicaffeoylquinic acid suggests convergent evolution. Our research clarifies the metabolism strategy of chlorogenic acid in Echinacea species and provides more insight into plant metabolism.

Isolation and Identification Klebsiella pneumoniae and use as Microbial Source for Extract Enzyme Arginine Deiminase from Respiratory Infections in Sheep at Babylon City, Iraq

Isolation and Identification Klebsiella pneumoniae and use as Microbial Source for Extract Enzyme Arginine Deiminase from Respiratory Infections in Sheep at Babylon City, Iraq

Synthesis of Substituted Arylidene Hydrazinyl Trifluoromethyl Thiazole Derivatives and their Antibacterial Studies using different Genes Expression

AbstractCyclization of substituted thiosemicarbazones with 3‐bromo‐1,1,1‐trifluoroacetone affords new 2‐(arylidenehydrazinyl)‐4‐trifluoromethylthiazoles (3 a–m, 13 examples, 71–89 %). These compounds were synthesized in two steps and characterized using 1H‐, 13C‐NMR, FTIR spectroscopy, and HRMS. All of these compounds show potent activity against both Escherichia coli (E. coli) and Klebsiella pneumonia (K. pneumonia) bacterial strains. The compounds 2‐(2‐(1‐(4‐fluorophenyl)ethylidene)hydrazinyl)‐4(trifluoromethyl)thiazole (3 b), 2‐(2‐(2‐hydroxy‐3‐methylbenzylidene)hydrazinyl)‐4‐(trifluoromethyl)thiazole (3 c), and 2‐(2‐(3‐fluorobenzylidene)hydrazinyl)‐4‐(trifluoromethyl)thiazole (3 k) show optimal minimum inhibitory concentration (MIC) values of 16 μg/mL against E. coli and (32, 32, and 8 μg/ml) against K. pneumonia, respectively. Using a qRT‐PCR technique the gene expression of two different genes (FLU and mexB) was determined. Most of these compounds (3 a, d–j, l, m) exhibited downregulation of these genes for both types of bacteria, whereas the gene expressions were unaffected after treating 3 b, 3 c and 3 k. This means that although these compounds were able to inhibit bacterial growth, they did not target the FLU and mexB genes in both types of bacteria. These findings suggest further investigations for lead optimization could provide viable antibiotics due to their structural similarity with some commercially available antibiotics.

Ancient Indian Diet – A Balanced Diet for the Healthy Diversity of Gut Microbiota and Management of Asthma

Modernization, a stressful lifestyle, attachment to a Western diet, and the use of preserved and processed foods lead to a loss of homeostasis of intestinal microbial diversity. The use of refined flour and refined sugar, which lack of micro biota-accessible carbohydrates (MAC), means dietary fiber high salt consumption, and saturated fats in fried and packaged foods cause gut microbiota dysbiosis. Microbial dysbiosis caused by high fat, salt, and lack of fiber causes several metabolic diseases, including asthma. The objective of the study is to develop a hypothetic model that “Ancient Indian diet” which is inspired by thousands of years of Indian science, including Yoga, Ayurveda, and Naturopathy may maintain the diversity of the gut microbiota and may inhibits the asthmatic symptoms by enhancing the growth of antiasthmatic bacteria. A keyword search utilizing the phrases "western diet, beneficial microbiota, asthma, gut microbial dysbiosis, Ancient Indian diet" was conducted electronically search through the SCOPUS ,Science Direct ,PubMed, Web of Science, and PsycINFO databases. Search criteria are divided into two arms the first one includes different full-text research papers including how Indian diet altered gut microbial composition. The second one, we included the full text including how presence of certain gut microbiota can prevents the asthmatic attack. To find publications that met the eligibility requirements, the first and third authors separately reviewed each publication's title and abstract using the previously described inclusion criteria. We have included 124 research articles, which is published between 1989 to 2024. A plant-based ancient Indian diet increases the diversity of Bacteroidetes, Actinobacteria, Prevotella, Bifidobacterium, Lactobacillus, Ruminococcus, Roseburia, Lactobacillus, Lachnospira, Akkermansia and shows inhibitory effects against Clostridium, E. coli, Staphylococcus, Haemophilus, Moraxella and Neisseria. The ancient Indian diet a low-fat lacto-vegetarian diet maintains gut microbiota homeostasis, and suppresses the growth of pathogenic asthmatic bacteria and promotes the growth of beneficial asthmatic bacteria.

Interaction of Trypanosoma cruzi, Triatomines and the Microbiota of the Vectors—A Review

This review summarizes the interactions between Trypanosoma cruzi, the etiologic agent of Chagas disease, its vectors, triatomines, and the diverse intestinal microbiota of triatomines, which includes mutualistic symbionts, and highlights open questions. T. cruzi strains show great biological heterogeneity in their development and their interactions. Triatomines differ from other important vectors of diseases in their ontogeny and the enzymes used to digest blood. Many different bacteria colonize the intestinal tract of triatomines, but only Actinomycetales have been identified as mutualistic symbionts. Effects of the vector on T. cruzi are indicated by differences in the ability of T. cruzi to establish in the triatomines and in colonization peculiarities, i.e., proliferation mainly in the posterior midgut and rectum and preferential transformation into infectious metacyclic trypomastigotes in the rectum. In addition, certain forms of T. cruzi develop after feeding and during starvation of triatomines. Negative effects of T. cruzi on the triatomine vectors appear to be particularly evident when the triatomines are stressed and depend on the T. cruzi strain. Effects on the intestinal immunity of the triatomines are induced by ingested blood-stage trypomastigotes of T. cruzi and affect the populations of many non-symbiotic intestinal bacteria, but not all and not the mutualistic symbionts. After the knockdown of antimicrobial peptides, the number of non-symbiotic bacteria increases and the number of T. cruzi decreases. Presumably, in long-term infections, intestinal immunity is suppressed, which supports the growth of specific bacteria, depending on the strain of T. cruzi. These interactions may provide an approach to disrupt T. cruzi transmission.