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Tu P, Zhang G, Cen Y, Huang B, Li J, Li Y, Deng L, Yuan H. Enhanced phosphate adsorption and desorption characteristics of MgO-modified biochars prepared via direct co-pyrolysis of MgO and raw materials. BIORESOUR BIOPROCESS 2023; 10:49. [PMID: 38647775 PMCID: PMC10991339 DOI: 10.1186/s40643-023-00670-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 07/28/2023] [Indexed: 04/25/2024] Open
Abstract
Biochar modified by metal ions-particularly Mg-is typically used for the effective recovery of phosphorous. In this study, MgO-modified biochars were synthesized via the direct co-pyrolysis of MgO and raw materials such as rice straw, corn straw, Camellia oleifera shells, and branches from garden waste, which were labeled as MRS, MCS, MOT, and MGW, respectively. The resulting phosphate (PO) adsorption capacities and potential adsorption mechanisms were analyzed. The PO adsorption capacities of the biochars were significantly improved after the modification with MgO: MRS (24.71 ± 0.32 mg/g) > MGW (23.55 ± 0.46 mg/g) > MOT (15.23 ± 0.19 mg/g) > MCS (14.12 ± 0.21 mg/g). PO adsorption on the modified biochars was controlled by physical adsorption, precipitation, and surface inner-sphere complexation processes, although no electrostatic attraction was observed. Furthermore, PO adsorbed on modified biochars could be released under acidic, alkaline, and neutral conditions. The desorption efficiency of MRS was modest, indicating its suitability as a slow-release fertilizer.
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Affiliation(s)
- Panfeng Tu
- Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, People's Republic of China
| | - Guanlin Zhang
- Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, People's Republic of China
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, China
| | - Yingyuan Cen
- Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, People's Republic of China
| | - Baoyuan Huang
- Institute of Biomass Engineering, South China Agricultural University, Guangzhou, 510642, People's Republic of China
| | - Juan Li
- Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, People's Republic of China
| | - Yongquan Li
- Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, People's Republic of China
| | - Lifang Deng
- Institute of Biomass Engineering, South China Agricultural University, Guangzhou, 510642, People's Republic of China.
| | - Haoran Yuan
- Institute of Biomass Engineering, South China Agricultural University, Guangzhou, 510642, People's Republic of China
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, China
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Co-Occurrence of L. monocytogenes with Other Bacterial Genera and Bacterial Diversity on Cleaned Conveyor Surfaces in a Swine Slaughterhouse. Microorganisms 2022; 10:microorganisms10030613. [PMID: 35336188 PMCID: PMC8948719 DOI: 10.3390/microorganisms10030613] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 03/04/2022] [Accepted: 03/09/2022] [Indexed: 11/25/2022] Open
Abstract
Bacterial pathogens, such as Listeria monocytogenes, can show resistance to disinfection and persistence on working surfaces, permitting them to survive and contaminate food products. Persistence—a complex phenomenon involving interactions between many bacteria within a biofilm—is modulated by in situ characteristics. This study aimed to describe, in silico, the microbiota identified in a swine slaughterhouse after sanitation procedures to better understand the presence of L. monocytogenes on these surfaces. Molecular tools for characterization of microbial communities were used to assess the relative contribution of different bacteria resulting from this phenomenon, and the 16S rRNA sequencing method was used on samples from meat conveyor belt surfaces collected on four sampling visits to study the co-occurrence between L. monocytogenes and other bacteria. From the background microbiota, a total of six genera were found to be negatively correlated with Listeria spp., suggesting Listeria growth inhibition, competition, or at least an absence of shared habitats. Based on these results, a complete scenario of interactions of Listeria with components of background microbiota was established. This work contributes to identifying avenues that could prevent the growth and persistence of L. monocytogenes on food-processing surfaces.
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Isolation and characterization of 1-palmitoyl-2-linoleoyl-sn-glycerol as a hormogonium-inducing factor (HIF) from the coralloid roots of Cycas revoluta (Cycadaceae). Sci Rep 2019; 9:4751. [PMID: 30894551 PMCID: PMC6426835 DOI: 10.1038/s41598-019-39647-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 01/29/2019] [Indexed: 11/27/2022] Open
Abstract
Coralloid roots are specialized tissues of cycads (Cycas revoluta) that are involved in symbioses with nitrogen-fixing Nostoc cyanobacteria. We found that a crude methanolic extract of coralloid roots induced differentiation of the filamentous cell aggregates of Nostoc species into motile hormogonia. Hence, the hormogonium-inducing factor (HIF) was chased using bioassay-based isolation, and the active principle was characterized as a mixture of diacylglycerols (DAGs), mainly composed of 1-palmitoyl-2-linoleoyl-sn-glycerol (1), 1-palmitoyl-2-oleoyl-sn-glycerol (2), 1-stearoyl-2-linolenoyl-sn-glycerol (3), and 1-stearoyl-2-linoleoyl-sn-glycerol (4). Enantioselectively synthesised compound 1 showed a clear HIF activity at 1 nmol (0.6 µg) disc−1 for the filamentous cells, whereas synthesised 2-linoleoyl-3-palmitoyl-sn-glycerol (1′) and 1-palmitoyl-2-linoleoyl-rac-glycerol (1/1′) were less active than 1. Conversely, synthesised 1-linoleoyl-2-palmitoyl-rac-glycerol (8/8′) which is an acyl positional isomer of compound 1 was inactive. In addition, neither 1-monoacylglycerols nor phospholipids structurally related to 1 showed HIF-like activities. As DAGs are protein kinase C (PKC) activators, 12-O-tetradecanoylphorbol-13-acetate (12), urushiol C15:3-Δ10,13,16 (13), and a skin irritant anacardic acid C15:1-Δ8 (14) were also examined for HIF-like activities toward the Nostoc cells. Neither 12 nor 13 showed HIF-like activities, whereas 14 showed an HIF-like activity at 1 nmol/disc. These findings appear to indicate that some DAGs act as hormogonium-inducing signal molecules for filamentous Nostoc cyanobacteria.
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Nishita M, Hirota K, Matsuyama H, Yumoto I. Development of media to accelerate the isolation of indigo-reducing bacteria, which are difficult to isolate using conventional media. World J Microbiol Biotechnol 2017; 33:133. [PMID: 28585166 DOI: 10.1007/s11274-017-2300-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 05/23/2017] [Indexed: 11/26/2022]
Abstract
Indigo-reducing bacteria perform natural fermentation in indigo fermentation fluid. Owing to the stochastic nature of the process, the constituent in indigo fermentation fluid differ depending on the prepared batch and fermentation period. To identify new indigo-reducing bacteria, isolation of the bacteria is indispensable. However, isolation of indigo-reducing bacteria is difficult because conventional media are often unsuitable to isolate these slow-growing bacteria that also exist in low numbers. Hydrolysates of polysaccharides and mixtures of plant base constituents are candidates to accelerate the isolation of indigo-reducing bacteria that cannot be isolated using conventional media. In this current study, wheat bran hydrolysate and composted indigo leaves (sukumo) were used as ingredients in the fermentation fluid in the selective medium for indigo-reducing bacteria in anaerobic culture. The results suggested that obligate and oxygen-non-metabolizing facultative anaerobes are difficult to isolate using conventional media, whereas oxygen-metabolizing facultative anaerobes, relatively rapid-growing and major bacterial strains are relatively easy to isolate. Media containing sukumo hydrolysate facilitated the isolation of novel species of Bacillus pseudofirmus-related strains, whereas media containing wheat bran hydrolysate facilitated the isolation of Amphibacillus spp. (including new species). Seven species (including two new species) of indigo-reducing bacteria were isolated using wheat bran hydrolysate-containing media, whereas six species (including three new species) of indigo-reducing bacteria were isolated using media containing both wheat bran and sukumo hydrolysates. These newly developed culture media will facilitate the isolation of unknown bacteria in indigo fermentation and in environments similar to indigo fermentation fluid.
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Affiliation(s)
- Masatoshi Nishita
- School of Biological Science and Engineering, Tokai University, Minamisawa, Minami-ku, Sapporo, 005-8601, Japan
- Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukisamu-Higashi, Toyohira-ku, Sapporo, 062-8517, Japan
| | - Kikue Hirota
- Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukisamu-Higashi, Toyohira-ku, Sapporo, 062-8517, Japan
| | - Hidetoshi Matsuyama
- School of Biological Science and Engineering, Tokai University, Minamisawa, Minami-ku, Sapporo, 005-8601, Japan
| | - Isao Yumoto
- Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukisamu-Higashi, Toyohira-ku, Sapporo, 062-8517, Japan.
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Ramos C, Pietri R, Lorenzo W, Roman E, Granell LB, Cadilla CL, López-Garriga J. Recombinant hemoglobin II from Lucina pectinata: a large-scale method for hemeprotein expression in E. coli. Protein J 2010; 29:143-51. [PMID: 20221789 PMCID: PMC2873899 DOI: 10.1007/s10930-010-9234-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Hemoglobin II from the clam L. pectinata is an O(2) reactive protein that remains oxygenated in the presence of other molecules. To determine the mechanism of ligand selection in this hemoglobin, rHbII was expressed in large quantities using an improved fermentation process. The highest protein yield was obtained by: transforming HbII into the BLi5 cells, inducing and supplementing the culture during the mid-log phase with 1 mM IPTG, 30 microg/mL hemin chloride and 1% glucose, and decreasing the temperature to 30 degrees C after induction. In addition, cell culture density was greatly enhanced by using glycerol, adding MgSO(4), supplementing the media with glucose after the glycerol was consumed and maintaining the dissolved oxygen at 35%. Under these conditions the maximum protein yield obtained was approximately 2,300 mg/L. The results indicate that rHbII is similar to the native protein. The protocol was validated with other hemoglobins, indicating that it can be extended to other hemeproteins.
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Affiliation(s)
- Cacimar Ramos
- Department of Chemistry, University of Puerto Rico, Mayagüez Campus, PO BOX 9019, Mayagüez, PR 00681-9019, USA
| | - Ruth Pietri
- Department of Chemistry, University of Puerto Rico, Mayagüez Campus, PO BOX 9019, Mayagüez, PR 00681-9019, USA
| | - Wilmarie Lorenzo
- Department of Chemistry, University of Puerto Rico, Mayagüez Campus, PO BOX 9019, Mayagüez, PR 00681-9019, USA
| | - Elddie Roman
- Department of Chemistry, University of Puerto Rico, Mayagüez Campus, PO BOX 9019, Mayagüez, PR 00681-9019, USA
| | - Laura B. Granell
- Department of Chemistry, University of Puerto Rico, Mayagüez Campus, PO BOX 9019, Mayagüez, PR 00681-9019, USA
| | - Carmen L. Cadilla
- Department of Biochemistry, School of Medicine, University of Puerto Rico, Medical Sciences Campus, PO BOX 365067, San Juan, PR 00936-5067, USA
| | - Juan López-Garriga
- Department of Chemistry, University of Puerto Rico, Mayagüez Campus, PO BOX 9019, Mayagüez, PR 00681-9019, USA
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PENGNOO A, HASHIDOKO Y, ONTHONG J, GIMSANGUAN S, SAE-ONG M, SHINANO T, WATANABE T, OSAKI M. Screening of phosphate-solubilizing microorganisms in rhizosphere and rhizoplane of adverse soil-adapting plants in Southern Thailand. TROPICS 2007. [DOI: 10.3759/tropics.16.1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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SITEPU IR, ARYANTO, OGITA N, OSAKI M, SANTOSO E, TAHARA S, HASHIDOKO Y. Screening of rhizobacteria from dipterocarp seedlings and saplings for the promotion of early growth of Shorea selanica seedlings. TROPICS 2007. [DOI: 10.3759/tropics.16.245] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Ogita N, Hashidoko Y, Limin SH, Tahara S. Linear 3-hydroxybutyrate tetramer (HB4) produced by Sphingomonas sp. is characterized as a growth promoting factor for some rhizomicrofloral composers. Biosci Biotechnol Biochem 2006; 70:2325-9. [PMID: 16960351 DOI: 10.1271/bbb.60299] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Sphingomonas spp. of alpha-proteobacteria often play a role in assisting the development of microfloral communities under adverse soil conditions. Using a Frateuria sp. as an indicator for bacterial growth assay, we investigated the bacterial growth-promoting factor in the culture fluids of Sphingomonas sp. EC-K085. This factor was successfully isolated and identified as linear (R,R,R,R)-3-hydroxybutyrate tetramer (HB4), having a hydroxy-end and a carboxy-end group. When 28 mug of HB4 was charged on a paper disc, impregnated Frateuria sp. cells in modified Winogradsky agar medium exhibited a promoted cell growth to form a clear colony emerging zone after a 2-day incubation.
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Affiliation(s)
- Noriko Ogita
- Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University, Sapporo, Japan
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Islam MT, Hashidoko Y, Deora A, Ito T, Tahara S. Suppression of damping-off disease in host plants by the rhizoplane bacterium Lysobacter sp. strain SB-K88 is linked to plant colonization and antibiosis against soilborne Peronosporomycetes. Appl Environ Microbiol 2005; 71:3786-96. [PMID: 16000790 PMCID: PMC1169021 DOI: 10.1128/aem.71.7.3786-3796.2005] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We previously demonstrated that xanthobaccin A from the rhizoplane bacterium Lysobacter sp. strain SB-K88 suppresses damping-off disease caused by Pythium sp. in sugar beet. In this study we focused on modes of Lysobacter sp. strain SB-K88 root colonization and antibiosis of the bacterium against Aphanomyces cochlioides, a pathogen of damping-off disease. Scanning electron microscopic analysis of 2-week-old sugar beet seedlings from seeds previously inoculated with SB-K88 revealed dense colonization on the root surfaces and a characteristic perpendicular pattern of Lysobacter colonization possibly generated via development of polar, brush-like fimbriae. In colonized regions a semitransparent film apparently enveloping the root and microcolonies were observed on the root surface. This Lysobacter strain also efficiently colonized the roots of several plants, including spinach, tomato, Arabidopsis thaliana, and Amaranthus gangeticus. Plants grown from both sugar beet and spinach seeds that were previously treated with Lysobacter sp. strain SB-K88 displayed significant resistance to the damping-off disease triggered by A. cochlioides. Interestingly, zoospores of A. cochlioides became immotile within 1 min after exposure to a SB-K88 cell suspension, a cell-free supernatant of SB-K88, or pure xanthobaccin A (MIC, 0.01 microg/ml). In all cases, lysis followed within 30 min in the presence of the inhibiting factor(s). Our data indicate that Lysobacter sp. strain SB-K88 has a direct inhibitory effect on A. cochlioides, suppressing damping-off disease. Furthermore, this inhibitory effect of Lysobacter sp. strain SB-K88 is likely due to a combination of antibiosis and characteristic biofilm formation at the rhizoplane of the host plant.
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Affiliation(s)
- Md Tofazzal Islam
- Laboratory of Ecological Chemistry, Graduate School of Agriculture, Hokkaido University, Kita-Ku, Sapporo 060-8589, Japan
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