Abstract. Salamun, Susetyo RD, Nafidiastri FA, Zain RA, Sari RP, Geraldi A, Fatimah, Ni’matuzahroh. 2022. Potential biocontrol agent of indigenous Bacillus sp. EG6.4: Molecular identification, larvicidal toxicity, and mechanism of actions Biodiversitas 23: 5431-5438. This research was carried out for molecular identification, as well as the determination and mechanism of action of larvicidal toxicity of Bacillus sp. EG6.4 isolated from breeding sites of Aedes aegypti from Gresik, East Java, Indonesia. Bacillus sp. EG6.4 was a Gram-positive endospore-forming bacteria. Molecular species identification using 16S rRNA gene sequencing showed that isolate had 97.89% similarity with Bacillus mojavensis. The isolate showed larvicidal toxicity against A. aegypti larvae. The lethal concentration 50% (LC50) values ??at 24 and 48hours exposure were 8.99±1.01 ×107 cells/mL and 8.43±1.01 ×107 cells/mL, respectively, while lethal time 50% (LT50) value was 11.9±1.1 hours. Production of chitinolytic enzymes or biosurfactants, chitinolytic and hemolytic assays were conducted to determine the larvicidal mechanism. As a result, Bacillus sp. EG6.4 showed hemolytic, but not chitinolytic activity, indicating its potency to produce biosurfactants. Transmission Electron Microscopy (TEM) result showed that isolate had oval-shaped endospores located subterminal with massive-shape parasporal inclusions. The detection of srfA-D gene showed that isolate produced surfactin biosynthesis thioesterase. Thus, Bacillus sp. EG6.4 produced biosurfactant that potentially to be developed as a biocontrol agent for disease vectors and plant pathogens.
This research aims to find Indonesian local isolates of Phosphate Solubilizing Bacteria (PSB) originated from Tuban Mangrove Center. The composited soil samples was taken by purposive sampling method. The isolation technique was done by serial dilution on pikovskaya media (10−1-10−8 CFU/g soils ). Bacteria was show clear zones around colonies indicated to solubilize phosphate. The potential bacteria were identified by morphological, physiological and molecular (16SrRNA gene). A total of 19 isolates were shown phosphate solubilizing. One isolate was namely 4a has highest phosphate solubilization index (2.36 ± 0.07mm) with similarity 97.28% belong to Kleibsiella variicola based on 16S rRNA gene analysis.
Abstract. Nafidiastri FA, Susetyo RD, Nurhariyati T, Supriyanto A, Geraldi A, Ni’matuzahroh, Fatimah, Salamun. 2021. Biosurfactant activity of indigenous Bacillus sp. ES4.3 isolated from endemic breeding sites of dengue hemorrhagic fever vector in Surabaya, East Java, Indonesia. Biodiversitas 22: 5375-5381. Bacillus spp. have shown the ability to results a variety of commercial bioactive compounds such as proteins, peptides, and lipopeptides (LPs). Some of the LPs produced by Bacillus spp. are surfactin, iturin, and fengicin. This study aimed to determine the name of the indigenous Bacillus sp. ES4.3, the biosynthesis surfactin gene, and the potential activity for biosurfactant produced by entomopathogenic Bacillus sp. ES4.3 isolated from endemic breeding sites of ??Dengue Hemorrhagic Fever Vector in Surabaya, East Java, Indonesia. Genomic DNA of Bacillus sp. ES4.3 was detected by isolating the DNA and visualizing it by electrophoresis. Furthermore, the 16S rRNA gene was amplified by the Polymerase Chain Reaction (PCR) method. The resulting nucleotide sequences were analyzed to find the relationship between Bacillus sp ES4.3 with another bacteria using MEGA version 6 software. Detection of biosynthesis surfactin gene was carried out by PCR method using srfAD primers. Analysis of the homology level of the surfactin gene was performed using the NCBI BLASTn and BLASTp genetic analysis program. The indigenous Bacillus sp. ES4.3 had 97.66% closeness to the species Bacillus velezensis FZB42 and the surfactin gene showed a 100% ID with the surfactin biosynthesis thioesterase SrfA-D gene on the Bacillus amyloliquefaciens group. The biosurfactant activity was indicated by the formation of clear zones, emulsions, and a decrease in surface tension in the values ??of 21.38 mN/m from the NB medium control and 33.74 mN/m from the distilled water control. The ability of B. velezensis ES4.3 to hemolyzed and reduce surface tension indicated the presence of biosurfactant that can disrupt stability and damage the midgut of Aedes aegypti. Thus, B. velezensis ES4.3 has the potential to be developed as a biocontrol in disease vectors.
Abstract. Salamun, Susetyo RD, Ni’matuzahroh, Fatimah, Geraldi A, Supriyanto A, Nurhariyati T, Nafidiastri FA, Nisa’ N, Endarto. 2023. Biosurfactant production of entomopathogenic Bacillus subtilis BK7.1, as potential biocontrol bacteria, isolated from Baluran National Park, East Java, Indonesia. Biodiversitas 24: 1785-1792. Biosurfactants as biocontrol agents have received much attention for pest control and disease vectors. The research aimed to identify the species and genetic relationship, hemolytic activity, detect coding genes, and trial production of biosurfactants on various substrates of entomopathogenic Bacillus sp. BK7.1 isolated from natural soil in Baluran National Park, East Java, Indonesia. Biosurfactant screening was carried out by testing hemolytic activity, surface tension, and emulsification activities, detecting coding genes of biosurfactant biosynthesis, and testing biosurfactant production in various substrates. The results of the molecular identification by amplifying the 16S rRNA gene using the Polymerase Chain Reaction (PCR) method for Bacillus sp. BK7.1 has a genetic similarity of 98.68% with B. subtilis subsp. inaquosorum strain BGSC 3A28. Screening showed positive hemolytic activity results, reduced surface tension, increased emulsification activities, and the production of biosurfactant in glucose, glycerol, and molasses substrates. The PCR results showed that Bacillus sp. BK7.1 had srfAA and srfAD genes encoding surfactin biosynthesis, giving it the potential to produce bioinsecticide compounds. Based on these studies, the indigenous entomopathogenic B. subtilis BK7.1 can be developed as environmentally friendly microbial bioinsecticides for pest control and disease vectors.
Background & Objective: Neuropathic pain (NP) is a pain due to a somatosensory lesion. NP leads to disruption of health, work, social relationships, hobbies, sleep, mood, and cognitive function. Up till now, the treatment of NP remains unsatisfactory. It makes many patients seek alternative therapies, including wet cupping therapy (WCT). We aimed to analyze the effects of WCT against NP in chronic constriction injury (CCI) in a rat model by assessing the increase in time withdrawal latency (TWL) and GABA-A receptors expression in the spinal cord. Methodology: We used CCI as one of the NP models in Rattus norvegicus species of rats and treated with WCT. We used 21 four months old male rats, divided into 3 groups (n = 7); P1 (sham CCI group), P2 (CCI group), and P3 (CCI plus WCT group). WCT was given two times every week for three weeks with 5 min of first cupping using −200 mmHg, and followed by ten punctures and then 5 min of second cupping using −200 mmHg. TWL assesment was conducted by using hotplate. Expresion of GABA-A receptor was evaluated with immunohistochemistry. Results: WCT significantly increased TWL with P = 0.0001 and decreased expresion of GABA-A receptors in the spinal cord of CCI rat model. Conclusion: This research concluded that wet cupping therapy could increase time withdrawal latency and decrease the expression of GABA-A receptors in the spinal cord in chronic constriction injury rat model. This result suggests a promising method in controlling neuropathic pain. However, further investigations are required to understand the mechanism. Abbreviations: CCI: Chronic Constriction Injury; CT: Cupping Therapy; DCT: Dry Cupping Therapy; NP: Neuropathic Pain; TWL: Time Withdrawal Latency; WCT: Wet Cupping Therapy; Key words: Chronic constriction injury; CCI rat model; GABA-A receptors; Neuropathic pain; Pain; Time withdrawal latency; TWL; Wet cupping therapy. Citation: Hidayati HB, Qurnianingsih E, Widjiati, Khaerunnisa S, Puspamaniar VA, Susetyo RD. Wet cupping therapy increases the time withdrawal latency (TWL) and decreases GABA-A receptor expression in the spinal cord in a rat model of neuropathic pain. Anaesth. pain intensive care 2022;27(1):97−103; DOI: 10.35975/apic.v27i1.2124 Received: July 05, 2022; Reviewed: July 08,2022; Accepted: December 12, 2022
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.