ABSTRACT
Aims@#Symbiotic bee fungus associated with the stingless bee larval food has been revealed to play a major role in performing a mutual relationship with the host. The fungus is believed capable to produce crucial nutrients that are required for larval pupation. However, detailed information on the fungus identification isolated from the larval food of our native Indo-Malaya stingless bee, Heterotrigona itama (Hymenoptera: Apidae), is poorly understood. Hence, this study was conducted to determine the effect of fungus isolated from the stingless bee larval food on the survival of H. itama larvae and identify the isolated fungus using both morphological and molecular analyses.@*Methodology and results@#Elisa plates designed with F-bottom type were used as artificial brood cells in a controlled condition. The eggs transferred to Elisa plates were kept in the incubator with 75%-100% humidity and 25 ± 2.5 °C of temperature. This study carried out in three different treatments: (1) microbes-free larval food, (2) fresh larval food and (3) microbes-free larval food with fungus supplement. Results showed that the survival of H. itama larvae depends on the presence of beneficial fungus with the highest survival rate (Treatment 2 = 85.71%). The absence of the beneficial fungus in the fluid food of H. itama showed the lowest survival rate (Treatment 1 = 37.14%). Microscopy analysis showed that the fungus had various forms, including unconjugated asci, round-shaped ascospore and pseudohyphae. The molecular characterisation of the isolated fungi was performed using 23S rRNA gene sequencing using universal primers ITS1 and ITS4. DNA barcoding of three isolated fungi confirmed all isolated fungi matched Panus lecomtei (Basidiomycetes; Poriales; Polyporaceae) with 99.70% of similarity.@*Conclusion, significance and impact of study@#This study provides information on the importance of whitish fungus in appearance that existed in the brood cell, which is proposed to be the crucial component of in-vitro stingless bee queen rearing protocol.
ABSTRACT
Aims@#The contact lens (CL) has become one of the most convenience refractive devices used in vision correction, occupational and in cosmetics purposes. Despite the convenience of CL usage, poor hygiene might cause eye infections due to microbial contamination. In this work, a random collection of used CL cases among Universiti Malaysia Terengganu (UMT) students had shown the emergence of antibiotic-resistant bacteria towards commonly used antibiotics to treat eye infections.@*Methodology and results@#The study was carried out from 28 CL cases samples with the duration of one to three months of use. Bacteria that were successfully isolated from the CL cases were then exposed to the commonly prescribed antibiotics followed by identification through the partial 16S rDNA sequencing. Our finding exhibited that the rate of contamination is over 50% where 32 bacteria were isolated, with 20 (62.5%) of the isolates were Gram-positive bacteria. Approximately 31% of the isolated bacteria are resistant and intermediate resistant to the commonly used antibiotics to treat eye infection, especially erythromycin and chloramphenicol. The isolated bacteria were genotypic identified as Bacillus cereus, B. anthracis, Acinetobacter variabilis, Klebsiella pneumoniae, and Serratia marcescens. These bacteria are known as a common cause for microbial keratitis, except for A. variabilis, where the association of this bacteria in causing microbial keratitis is relatively rare.@*Conclusion, significance and impact of study@#This study highlights the emergence of antibiotic-resistant bacteria that can cause severe eye infections among CL wearer. The high percentage of contamination (>50%) found from the isolates reflected on the lack of hygiene practice on the CL handling. Thus, it is crucial to perceive this study as microbial contamination will lead to more serious eye infection disease such as conjunctivitis and keratitis.
Subject(s)
Drug Resistance, Bacterial , Contact LensesABSTRACT
Honey has been extensively researched on their chemical and biological properties. It’s revealed the ability and capability of honey in treating or preventing many diseases. As people concerned, a safer approach using natural based product is critically needed and honey as one of the potential agent to be consider. Therefore, the information on its biological activities has to be clarify to make society understand the benefit of honey especially Gelam honey.