7 research outputs found
Upper bound of second Hankel determinant for subclass of close-to-convex functions / Muhammad Fazrul Azmi... [et al.]
No full textGeometric function theory is an extraordinary area of complex analysis. This area of
study is more often associated with geometric properties of analytic function such as
extremal properties, radius properties, representation theorem and coefficient bound.
Many researchers raised the interest in studying properties in different classes that have
been introduced. In this research, we focus on defining new subclasses of analytic
functions, L(a,<5,t,s) afterwards determining the upper bound of second Hankel
determinant for the selected class of function
Prevalence of Potentially Pathogenic Bacteria in Rodent Populations Near Natural Water Bodies From Sarawak
No full textThe gut microbiota of rodents forms a dynamic ecosystem within the gastrointestinal tract, actively contributing to the host’s physiological processes. The gut microbiome composition of wild rodents in particular could be influenced by external environmental factors. However, the specific determinants within the environments that directly affect the gut environment of wild rodents remain uncertain. One such influential factor could be natural water bodies, where bacterial communities can exploit the readily available organic matter for growth and circulate with the surrounding rodent populations. Additionally, rodents are known to be natural reservoirs of pathogenic bacteria due to their synanthropic nature and can transmit them through various pathways. Hence, this study aims to characterise the gut microbiome of wild rodents near natural water bodies and to identify pathogenic bacteria within the gut environment. To achieve these objectives, sampling was conducted across forested areas throughout Sarawak. Faecal samples of wild rodents were collected from a total of five sampling sites located near human settlements, accompanied by water quality sampling of natural water bodies across these localities. Nanopore sequencing was performed on the extracted faecal DNA for the characterisation of the gut microbiome of 16 wild rodent individuals belonging to six different species. A total of 1052 bacterial genera were detected, contributing to the gut microbiota of rodents at varying compositions and abundances. The most prominent bacterial families include Lachnospiracea, Lactobacillaceae and Oscillospiraceae, belonging to the phylum Bacillota. They could be considered members of the core rodent gut microbiome due to their high prevalence across various rodent individuals. Also, potentially pathogenic bacteria were detected, and they represent 11% of the total overall abundance. 51 potentially pathogenic bacterial genera, comprising of 774 species, that can cause zoonotic diseases were detected from all sampling
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sites, notably from the genera Clostridium, Klebsiella and Helicobacter. Additionally, while water quality parameters did not exhibit a significant association with the alpha diversity of the gut microbiome or the abundance of pathogenic bacteria, the genus Enterococcus displayed a positive correlation with biochemical oxygen demand. Overall, the characterisation of the gut microbiome of wild rodents across different localities revealed distinct variations. The site-specific bacterial species detected in this study highlights the potential environmental influences on the gut microbiota. This includes the detection of pathogenic bacteria that could potentially transmit to nearby human settlements, implying considerable health concerns
Five newly recorded species of bat (Mammalia, Chiroptera) from&nbsp;the UNESCO World Heritage Niah National Park, Sarawak, Malaysia,&nbsp;with an updated checklist of bats in the park
No full textFive species of bat&mdash;Myotis gomantongensis Francis &amp; Hill, 1998, Murina suilla (Temminck, 1840), Kerivoula intermedia Hill &amp; Francis, 1984, Phoniscus jagorii (Peters, 1866), and Miniopterus magnater Sanborn, 1931&mdash;are newly recorded from Niah National Park, Sarawak, Malaysia. We also present an updated checklist of bat species compiled from seven sampling efforts conducted between 1958 and 2025. A total of 43 bat species from nine families have been recorded to date in the park. This species list serves as a baseline for bat conservation in this UNESCO World Heritage Site
The Gut Microbiomes of Wild Rodents within Forested Environments in Sarawak, Borneo
No full textThe gut microbiota of rodents is shaped by highly diverse bacterial communities. Within the gut environment,
there are core gut bacteria that are responsible for facilitating essential bodily processes while maintaining the
health of the host rodents. Currently, research on the gut microbiota of wild rodents in Borneo remains limited,
especially those encompassing the potential influence of environmental factors. Through the Next-Generation
Sequencing (NGS) performed using Oxford Nanopore Technologies, a total of 1052 bacterial genera were detected
from 16 rodent individuals of six rodent species. These bacteria were found to be prevalent in the gut microbiota
of wild rodents in forested regions. Several bacterial families of importance belonging to the phylum Bacillota
were identified, including Lachnospiraceae (18%), Lactobacillaceae (20%) and Oscillospiraceae (19%). They were
found to have a high relative abundance when compared with other bacterial families. The diversity of gut
microbes among individual rodents showed no significant differences. However, the gut microbiome composition
of wild rodents appears to have been influenced by the host species and their life stages. The outcome of this study
allows for a better understanding of the prevailing core microbiome members shared across multiple wild rodent
individuals within forested areas
NON-VOLANT SMALL MAMMALS
No full textBorneo is home to at least 87 species of non-volant small mammals, and is represented by at least seven families: Muridae, Soricidae, Erinacidae, Tupaiidae, Sciuridae, Hystricidae and Ptiloceridae. The primary forests of Bako National Park has a rich non-volant small mammal
fauna. However, as past studies on mammals were focused on bats, flying lemurs and primates, a substantial gap exists in our knowledge of the small terrestrial mammals of the Park
The Gut Microbiomes of Wild Rodents within Forested Environments in Sarawak, Borneo: Rodent Gut Microbiomes in Sarawak Forests
No full textThe gut microbiota of rodents is shaped by highly diverse bacterial communities. Within the gut environment, there are core gut bacteria that are responsible for facilitating essential bodily processes while maintaining the health of the host rodents. Currently, research on the gut microbiota of wild rodents in Borneo remains limited, especially those encompassing the potential influence of environmental factors. Through the Next-Generation Sequencing (NGS) performed using Oxford Nanopore Technologies, a total of 1052 bacterial genera were detected from 16 rodent individuals of six rodent species. These bacteria were found to be prevalent in the gut microbiota of wild rodents in forested regions. Several bacterial families of importance belonging to the phylum Bacillota were identified, including Lachnospiraceae (18%), Lactobacillaceae (20%) and Oscillospiraceae (19%). They were found to have a high relative abundance when compared with other bacterial families. The diversity of gut microbes among individual rodents showed no significant differences. However, the gut microbiome composition of wild rodents appears to have been influenced by the host species and their life stages. The outcome of this study allows for a better understanding of the prevailing core microbiome members shared across multiple wild rodent individuals within forested areas
Metagenomic insights into host-specific gastroenteritis bacteria in forest rodents of Sarawak, Borneo: implications for one health surveillance of rodent-borne pathogens
No full textAbstract Rodents are known to act as reservoirs for zoonotic diseases due to their widespread distribution and synanthropic nature. Among these, foodborne pathogens capable of causing gastroenteritis in humans are of particular concern, as rodents can facilitate their transmission through contamination of food sources. Forest-dwelling rodents may harbour bacterial taxa native to their habitat, posing a risk of zoonotic spillover to nearby human settlements. This risk is further heightened by the growing prevalence of ecotourism activities, particularly in tropical countries like Malaysia. In this study, rodent trapping was conducted in selected forested areas adjacent to human settlements across Sarawak. Nanopore sequencing of the full-length 16 S rRNA gene was conducted on faecal DNA from 46 rodent individuals representing seven different species (Maxomys surifer, M. tajuddinii, M. whiteheadi, Niviventer cremoriventer, Rattus tanezumi, R. tiomanicus and Sundamys muelleri). A total of ten bacterial species associated with gastroenteritis were successfully detected. Notable findings in this study include Campylobacter, Salmonella and Shigella species, which are known to cause bacterial gastroenteritis in humans. Also, the presence of certain bacterial taxa in specific rodent genera suggests potential host specificity of foodborne pathogens. This study highlights the potential public health risks caused by rodent-borne bacterial transmission and the importance of monitoring forest rodents as potential reservoirs of zoonotic pathogens
