No abstract

Methicillin-resistant Staphylococcus aureus (MRSA) is an S. aureus strain that has developed resistance against ß-lactam antibiotics, resulting in a scarcity of a potent cure for treating Staphylococcus infections. In this study, the anti-MRSA and antioxidant activity of the Indonesian mangrove species Sonneratia caseolaris, Avicennia marina, Rhizophora mucronata, and Rhizophora apiculata were studied. Disk diffusion, DPPH, a brine shrimp lethality test, and total phenolic and flavonoid assays were conducted. Results showed that among the tested mangroves, ethanol solvent-based S. caseolaris leaves extract had the highest antioxidant and anti-MRSA activities. An antioxidant activity assay showed comparable activity when compared to ascorbic acid, with an IC50 value of 4.2499 ± 3.0506 ppm and 5.2456 ± 0.5937 ppm, respectively, classifying the extract as a super-antioxidant. Moreover, S. caseolaris leaves extract showed the highest content of strongly associated antioxidative and antibacterial polyphenols, with 12.4% consisting of nontoxic flavonoids with the minimum inhibitory concentration of the ethanol-based S. caseolaris leaves extract being approximately 5000 ppm. LC-MS/MS results showed that phenolic compounds such as azelaic acid and aspirin were found, as well as flavonoid glucosides such as isovitexin and quercitrin. This strongly suggested that these compounds greatly contributed to antibacterial and antioxidant activity. Further research is needed to elucidate the interaction of the main compounds in S. caseolaris leaves extract in order to confirm their potential either as single or two or more compounds that synergistically function as a nontoxic antioxidant and antibacterial against MRSA.

C. botulinum adalah salah satu bakteri paling patogen karena dapat menghasilkan botulinum neurotoxin (BoNT) yang mematikan. Terdapat 3 jenis botulisme, yaitu botulisme keracunan makanan, botulisme inhalasi, dan botulisme luka. Meskipun kejadian botulisme jarang, namun harus diwaspadai karena cukup fatal. Sebagian besar kasus botulisme pada manusia disebabkan oleh makanan kaleng yang dipersiapkan di rumah. Isolasi dan identifikasi C. botulinum dapat dilakukan dengan pemeriksaan pewarnaan Gram, kultur, dan identifikasi, sedangkan deteksi toksin dapat menggunakan metode mouse lethality assay, non-lethal mouse assay, dan metode imunologi. Pendekatan molekuler dilakukan melalui uji polymerase chain reaction (PCR) untuk deteksi jenis toksin. Pencegahan botulisme dilakukan dengan teknik penanganan makanan yang tepat. Pemanasan yang memadai dapat membunuh spora bakteri, selain itu segera mengonsumsi makanan yang telah dimasak dapat mencegah C. botulinum bertumbuh. C. botulinum is one of the most pathogenic bacteria because it can produce deadly botulinum neutotoxin (BoNT). There are 3 types of botulism: botulism poisoning, inhalation botulism, and wound botulism. Although the incidence of botulism is rare, the impact is quite fatal. Most cases of botulism in human are caused by canned food prepared at home. Isolation and identification of C. botulinum can be done by Gram staining, culture, and identification, while the detection of toxins can use the mouse lethality assay, non-lethal mouse assay, and immunological methods. Molecular approach can be done through polymerase chain reaction (PCR) examination to detect the toxin type. Prevention can be applied with proper food handling techniques. Adequate heating can kill bacterial spores, and direct consumption can prevent proliferation of C. botulinum.

This research is a part of a multidisciplinary research in the Angke River. The aim of this research is to study the river '

MRSA is Staphylococcus aureus bacteria  that is resistant to methicillin and certain antibiotics. These organisms live as commensal bacteria that are transmitted in communities and health facilities which cause various health problems. Patients who develop antibiotic resistance have a worse clinical condition and many lead to death. The purpose of this study was to compare MSSA and MRSA against fluoroquinolone group and vancomycin antibiotics.  Specimens derived from various clinical samples sent to microbiology laboratories FMUI for the period 2018-2019. Gram staining and culture is carried out according to the procedure of each colony that grows on the medium. Followed by identification using the automatic machine Vitek 2®. A total 62 isolates, 58 were MSSA and the others were MRSA (6.45%).  MSSA patients  are in the age range 1 -  >50 years, dominant in men while MRSA is in the age range 16 – 30 and  >50 years, dominant in women. The sensitivity of the fluoroquinolone group and vancomycin  of antibiotics to MSSA was 100% whereas for MRSA  it was 50 %  to fluoroquinolone group and 100% to vancomycin. Vancomycin can be the antibiotic of choice for the management of infections by MRSA bacteria.