AMB Express最新文献

{"title":"Optimized production and characterization of a thermostable cellulase from Streptomyces thermodiastaticus strain.","authors":"Mery S Waheeb, Walid F Elkhatib, Mahmoud A Yassien, Nadia A Hassouna","doi":"10.1186/s13568-024-01787-0","DOIUrl":"https://doi.org/10.1186/s13568-024-01787-0","url":null,"abstract":"<p><p>A high cellulase-producing bacterial isolate TS4 was recovered from an Egyptian soil sample and identified using 16S rRNA gene sequencing as Streptomyces thermodiastaticus. One-factor-at-a-time (OFAT) preliminary studies were carried out to determine the key factors affecting cellulase production by S. thermodiastaticus and their optimum ranges. The initial pH of the medium, carboxymethyl cellulose (CMC), tryptone, and NaCl concentrations were further optimized using a response surface Central Composite design. Fermentation under optimized variables of initial pH 6.0, presence of CMC, tryptone, and NaCl at concentrations of 2%, 0.03%, and 0.12%, respectively, resulted in 3.24 fold increase in cellulase productivity (2023 U/L) as compared to that under basal conditions (625 U/L). Cellulase production was also improved with a 4 Kilogray (KGy) dosage of gamma radiation. In comparison to the wild-type strain under basal circumstances, S. thermodiastaticus produced 5.1 fold more cellulase after a combination of model-based optimization and gamma radiation mutation. Cellulase was partially purified using ammonium sulfate precipitation followed by dialysis. The resulting cellulase was 1.74 times purified and its specific activity was 4.21 U/mg. The molecular weight of cellulase is 63 kDa as indicated by SDS-PAGE and zymogram. Its maximum activity was achieved at 60 °C and pH 5.0. In addition, it showed outstanding thermo-tolerance as it could retain its full activity after a 12-h incubation at 90 °C.</p>","PeriodicalId":7537,"journal":{"name":"AMB Express","volume":"14 1","pages":"129"},"PeriodicalIF":3.5,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142680383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Marine chitinase AfChi: green defense management against Colletotrichum gloeosporioides and anthracnose.","authors":"Rajesh K M, Keyur Raval, Ritu Raval","doi":"10.1186/s13568-024-01786-1","DOIUrl":"https://doi.org/10.1186/s13568-024-01786-1","url":null,"abstract":"<p><p>Anthracnose disease, caused by the Colletotrichum gloeosporioides species, affects vegetables, fruits, pulses, and cereals, leading to significant economic losses worldwide. Although many synthetic fungicides are used to control this pathogen, eco-friendly biological alternatives are gaining popularity. This study focuses on isolating and purifying chitinase ( Af Chi)from a marine bacterium and testing its antifungal efficacy against C. gloeosporioides spore germination by targeting the chitin in the fungal cell wall. The chitinase was purified from a marine bacterium A. faecalis from the Arabian Sea and had a molecular mass of 45 kDa and a specific activity of 84.6 U/mg. Af Chi worked best at 50 °C and pH 7.0 in Tris HCl buffer. Na⁺ ion was the highest cofactor, highlighting the halophilic nature of this chitinase. K⁺, Ca²⁺, Cu²⁺, Mg²⁺, Mn²⁺, and EDTA also increased activity, while Fe³⁺, Zn²⁺, Co²⁺, and Pb²⁺ decreased it. The K_m and V_max values were 1.87 µg/mL and 17.45 U/mL, respectively. Purified Af Chi at 10 mg/mL completely inhibited spore germination within 8 h and reduced the size of the spores.</p>","PeriodicalId":7537,"journal":{"name":"AMB Express","volume":"14 1","pages":"128"},"PeriodicalIF":3.5,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142680402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction: Improving carboxymethyl cellulose edible coating using ZnO nanoparticles from irradiated Alternaria tenuissima.","authors":"Mervat M Anwar, Sanaa S H Aly, Essam H Nasr, El-Sayed R El-Sayed","doi":"10.1186/s13568-024-01779-0","DOIUrl":"10.1186/s13568-024-01779-0","url":null,"abstract":"","PeriodicalId":7537,"journal":{"name":"AMB Express","volume":"14 1","pages":"127"},"PeriodicalIF":3.5,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11564461/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142611769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Antibiotics and lectin C for diarrhea control intervention in piglets and influences.","authors":"Hoang Dinh Trung, Ha Viet Hoang, Nguyen Thach Thong, Kenthalangsy Chitana, Dinh Thi Thu Hoai, Nguyen Quang Linh","doi":"10.1186/s13568-024-01775-4","DOIUrl":"10.1186/s13568-024-01775-4","url":null,"abstract":"<p><p>The study was conducted on 60 L of suckling piglets out of 775 piglets, of which 227 piglets had diarrhea litres of piglets, and out of 775 piglets, 227 piglets had diarrhoea syndrome. There were 3 interventions in separate trials as follows: 1 and 2 involved antibiotic use (Enrofloxacin and Gentamicin); Trial 3 used the supplement Lectin C (LvCLT3 and LvCLT4) for a treatment period of 3-7 days. Intervention results on 227 piglets with diarrhea showed the highest cure rate when supplemented with Lectin C, with no mortality rate, longer treatment time, and no reinfection rate. While the two antibiotic trials still had lower cure rates, mortality and reinfection rates were higher. After 05 days of recovery, piglets were tested for MCV, MCH, and MCHC, showing an apparent decrease in the group supplemented with Lectin C, while the two groups using antibiotics still had high rates, with a confidence level of P < 0.05; 0.01 and 0.001. Antibiotics treat piglets in their early stages, so there is a risk of immunodeficiency and low infection response. It is necessary to supplement substances derived from dietary supplements. Supplementing Lectin C increases resistance, enhances immune response, improves the effectiveness of treating diarrhoea syndrome in piglets, and ensures safe meat quality in the future. Lectin C supplementation will improve piglet health and breed quality efficiency. This heralds a promising future for the pig industry with improved meat quality and reduced environmental impact.</p>","PeriodicalId":7537,"journal":{"name":"AMB Express","volume":"14 1","pages":"126"},"PeriodicalIF":3.5,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11564646/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142611675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detection and molecular characterization of carbapenem-resistant gram-negative bacterial isolates.","authors":"Aliaa A Mustafa, Hala Abushady, Reda Roshdy, Sawsan Y Elateek, Ayman K El Essawy","doi":"10.1186/s13568-024-01780-7","DOIUrl":"10.1186/s13568-024-01780-7","url":null,"abstract":"<p><p>Antimicrobial-resistant bacteria (ARB) are responsible for increased mortality and morbidity. Therefore, this study focuses on evaluating traditional and molecular diagnostic tools of carbapenem-resistant gram-negative bacteria (CRGNB). In order to achieve this, 94 samples, from different patients' specimens, and surrounding environment, were collected from intensive care units (ICUs) at Ain Shams University Specialized Hospital and the National Cancer Institute, Cairo, Egypt. The swabs were cultured on appropriate media, including Chromogenic medium (HiCrome KPC Agar Base \"HIMEDI AM1831\"), and MacConkey-10 µg imipenem disc resulting in 136 isolates with different culture characteristics. Next, the selected isolates were subjected to VITEK 2 machine and 16SrRNA (16 S ribosomal RNA) sequencing. The sensitivity of HiCROME KPC agar for CRGNB detection was 99.3% and 94.7%, in reference to the MacConkey-disc and VITEK-2 methods, respectively. The HiCrome KPC agar assumptions for bacterial identification were not as consistent as those of VITEK 2 (with only 47.4% agreement) and 16SrRNA gene sequencing analysis. The approaches discussed in this study facilitate providing rapid diagnosis and treatment of CRGNB, which helps increase survival rates. HiCrome KPC agar is considered a relatively accurate and easy method that can be used in any laboratory. In addition, the selected strains were deposited in the gene bank with the accession numbers OR553657, OR553658, and OR553659. It is noteworthy that Genus Acinetobacter is the major CRGNB isolated from the patients and environmental surfaces in the hospitals. This highlights the importance of proper environmental and terminal cleaning procedures in healthcare facilities and applying control measures to ensure infection prevention.</p>","PeriodicalId":7537,"journal":{"name":"AMB Express","volume":"14 1","pages":"124"},"PeriodicalIF":3.5,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11561196/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142611774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isolation and assessment of highly sucrose-tolerant yeast strains for honey processing factory's effluent treatment.","authors":"Juan G Sánchez Novoa, Facundo G Domínguez, Hipólito Pajot, Laura I de Cabo, Juana María Navarro Llorens, Patricia L Marconi","doi":"10.1186/s13568-024-01771-8","DOIUrl":"10.1186/s13568-024-01771-8","url":null,"abstract":"<p><p>Wastewater from many food and beverage manufacturers is enriched in organic content, and it must therefore be treated before being discharged to comply with the strict environmental regulations to protect the final water quality. Concretely, the honey processing wastewater, that remains in holding tanks until is disposal, is a rich source of sugars and this high level of organic material will degrade the water quality if not treated properly provoking an imbalance in the ecosystem. There are different strategies for an adequate treatment of this wastewater effluent to obtain a sustainable usage. One of the techniques that is more cost-effective and environmental friendlier than chemical procedures used for water remediation, is the use of microorganisms (including algae, fungi, yeasts, or bacteria). Given that they are fast-growing, robust, and metabolically diverse, yeast strains are often used for wastewater treatment. In this work, we have studied the potential for bioremediation of non Saccharomyces yeast isolated from a honey processing wastewater generated by an Argentine exporting company. The inoculation of these yeast strains to the existing flora in the honey wastewater yielded a better improvement in the treatment yield. These results suggest that these strains display a promising role could for optimizing bioremediation strategies in industrial wastewater treatment processes.</p>","PeriodicalId":7537,"journal":{"name":"AMB Express","volume":"14 1","pages":"125"},"PeriodicalIF":3.5,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11561205/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142611779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Metabolomic profiling and 16 S rRNA metabarcoding of endophytes of two Aloe species revealed diverse metabolites.","authors":"Cynthia Marokane-Radebe, Adekunle Raimi, Stephen Amoo, Rasheed Adeleke","doi":"10.1186/s13568-024-01784-3","DOIUrl":"10.1186/s13568-024-01784-3","url":null,"abstract":"<p><p>Aloe species are often used interchangeably for medicinal and cosmeceutical applications, presenting a challenge to the biological efficacy consistency of some herbal preparations. Sustainable production of high-quality commonly used medicinal plants remains a limitation for commercialisation. Thus, this study investigated the potential for plant substitution by examining bacterial endophytes capable of producing similar host plant secondary metabolites. The metabolite profiles and endophytic bacterial communities of endangered Aloe lettyae were compared with those of Aloe longibracteata using nuclear magnetic resonance spectroscopy and 16 S rRNA gene sequencing. Only 15 metabolites were significantly different between A. lettyae and A. longibracteata based on metabolite concentrations. However, both plants' functionality and potential application remain comparable. Phytohormones, including indole-3-acetate and 5-hydroxyindole-3-acetate, were more concentrated in A. lettyae than A. longibracteata. Metabolites such as tyrosine, allantoin, and myo-inositol, with human health benefits, were annotated in both species. Aloe lettyae harboured a phylogenetically diverse bacteria community compared to A. longibracteata, with a higher richness of bacterial species, indicating a likelihood of diverse metabolic capabilities among the bacteria. Dominant endophytes, including Bacillus, Comamonas, and Pseudomonas, possess enzymes contributing to various metabolic pathways. The enzymes have the potential to impact the synthesis, or breakdown of plant metabolites, consequently influencing the overall metabolic composition of the host plant. Therefore, this study supports the interchangeability of A. lettyae and A. longibracteata due to their ability to produce similar metabolites, and although the Aloe species exhibit phylogenetically diverse endophytic communities, the feasibility of utilizing their endophytes as producers of secondary metabolites remains viable.</p>","PeriodicalId":7537,"journal":{"name":"AMB Express","volume":"14 1","pages":"122"},"PeriodicalIF":3.5,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11549271/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142611786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Clinical effects of anweiyang capsule and Pinellia decoction for eradication of Helicobacter pylori and healing of peptic ulcers.","authors":"Xiaoying Feng, Xin Zhao, Lanlan Cao, Ruixue Shang, Xinran Feng","doi":"10.1186/s13568-024-01783-4","DOIUrl":"10.1186/s13568-024-01783-4","url":null,"abstract":"<p><p>Peptic ulcers are a prevalent and often chronic condition within the digestive system, frequently prone to recurrence. This study aims to evaluate the clinical effects of Anweiyang capsule combined with Pinellia Heart-Draining Decoction on Helicobacter pylori eradication, ulcer healing rates, and improvement of Traditional Chinese Medicine (TCM) syndromes in patients with peptic ulcers. A total of 100 patients were randomly assigned to an observation group (n = 50), receiving the herbal combination, and a control group (n = 50), receiving standard Western medical treatment. The total effective rate was significantly (P < 0.05) higher in the observation group (96%) compared to the control group (80%). After 4 weeks of treatment, serum procalcitonin (PCT) and C-reactive protein (CRP) levels decreased, while prostaglandin E2 (PGE2) levels increased in both groups; however, the observation group exhibited better results (P < 0.05). The observation group achieved a H. pylori eradication rate of 94% and an ulcer healing rate of 82%, compared to 64% and 56% in the control group, respectively. Improvement in TCM syndrome scores was more significant in the observation group (P < 0.05). Moreover, the incidence of adverse reactions was significantly (P < 0.05) lower in the observation group (4%) compared to the control group (18%). In conclusion, Anweiyang capsule combined with Pinellia Heart-Draining Decoction significantly enhances the eradication rate of H. pylori and the ulcer healing rate without substantially increasing the risk of adverse reactions, demonstrating its safety and reliability for patients.</p>","PeriodicalId":7537,"journal":{"name":"AMB Express","volume":"14 1","pages":"123"},"PeriodicalIF":3.5,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11549269/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142611757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Compatibility and antimicrobial activity of silver nanoparticles synthesized using Lycopersicon esculentum peels.","authors":"Esraa Ali, Samah H Abu-Hussien, Esraa Hesham, Shimaa Ahmed, Habiba Mostafa, Ahmed Gamal, Salwa M El-Sayed, Bahaa Hemdan, Ashraf Bakry, Naglaa M Ebeed, Hesham Elhariry, Ahmed Galal, Basma T Abd-Elhalim","doi":"10.1186/s13568-024-01774-5","DOIUrl":"10.1186/s13568-024-01774-5","url":null,"abstract":"<p><p>Nanoparticles have gained worldwide attention as a new alternative to chemical control agents due to their special physiochemical properties. The current study focused on the environmentally friendly synthesis of silver nanoparticles (AgNPs) using Lycopersicon esculentum peel. In addition to studying the intrinsic cytotoxic effectiveness of Le-AgNPs contribute to their antibacterial, and antifungal activities and the effect of nanoparticles on the integrity of their morphological behavior. The initiative biosynthesis of L. esculentum silver nanoparticles (Le-AgNPs) was indicated by the color change of L. esculentum (Le) extract mixed with silver nitrate (AgNO₃) solution from faint pink to faint brown. UV-visible spectroscopy, Dynamic light scattering (DLS), Fourier-transform infrared spectroscopy, high-resolution transmission electron microscopy (HR-TEM), and X-ray diffraction techniques were used to characterize biosynthesized Le-AgNPs. Results of UV-visible spectroscopy recorded surface plasmon resonance at 310 nm for SPR of 2.5. The DLS results showed particles of 186 nm with a polydispersity index of 0.573. The FTIR spectrum indicated the existence of carboxyl, hydroxyl, phenolic, and amide functional groups. The HR-TEM analysis revealed quasi-spherical crystal particles of Le-AgNPs. Le-AgNPs had a negative zeta potential of - 68.44 mV, indicating high stability. Bacillus subtilis ATCC 6633 and Escherichia coli ATCC 8739 were the most susceptible pathogens to Le-AgNPs inhibition, with inhibition zone diameters (IZDs) of 4.0 and 0.92 cm, respectively. However, Listeria monocytogenes NC 013768 and Shigella sonnei DSM 5570 were the most resistant pathogens, with IZDs of 0.92 and 0.90 cm, respectively. Le-AgNPs demonstrated good inhibitory potential against pathogenic fungi, with IZDs of 3.0 and 0.92 cm against Alternaria solani ATCC 62102 and Candida albicans DSM 1386, respectively. The cytotoxicity effect was observed at a half-maximal inhibitory concentration (IC₅₀) of 200.53 μg/ml on human colon NCM460D normal cells.</p>","PeriodicalId":7537,"journal":{"name":"AMB Express","volume":"14 1","pages":"120"},"PeriodicalIF":3.5,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11538111/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142581438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Scaling up production of cephalosporin C by Acremonium chrysogenum W42-I in a fermenter using submerged fermentation.","authors":"Asmaa A Ibrahim, Ghadir S El-Housseiny, Khaled M Aboshanab, Ansgar Stratmann, Mahmoud A Yassien, Nadia A Hassouna","doi":"10.1186/s13568-024-01778-1","DOIUrl":"10.1186/s13568-024-01778-1","url":null,"abstract":"<p><p>Cephalosporins presently stand as the most extensively utilized antibiotic in clinical settings. Acremonium (A.) chrysogenum is the main strain used in the manufacturing of cephalosporin C (CPC), which offers distinct advantages, including a wide-ranging antibacterial spectrum and powerful antibacterial efficacy. Our study aimed to determine the optimal conditions for scaling up the production of CPC from A. chrysogenum W42-I starting with the optimized conditions on the shake flask level obtained from our previous study and utilizing the optimized media (CPC2). The results indicated that an inoculum size equivalent to 1% v/v, aeration at 1 vvm, and an agitation rate of 400 rpm, with controlled pH at 4, were the most favorable conditions for the CPC production using a laboratory fermentor (14 L). The concentration of generated CPC was assessed using two standard curves obtained from agar well diffusion and high-performance liquid chromatography (HPLC). These optimized conditions resulted in a production of 399.52 µg/mL showing a significant increase of approximately 3.4 folds when compared to the unoptimized fermentation run. In conclusion, our findings demonstrated a more favorable time course for CPC production in the fermentor compared to that in the shake flask. Notably, there was a two-fold increase in production within the first three days. Fortunately, the fermentor achieved a noteworthy increase in output, generating 1.598 gm of the CPC within 4 L.</p>","PeriodicalId":7537,"journal":{"name":"AMB Express","volume":"14 1","pages":"121"},"PeriodicalIF":3.5,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11538202/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142581439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}