Hanh Kim Nguyen

Institute of oceanography, vast, vietnam · Marine ecology

To assess the impact of antibiotic use in aquaculture in Nha Trang bay, we conducted this study with the aim of assessing antibiotic resistance of opportunistic pathogenic bacteria isolated from water and sediment around shrimp/fish cages in the Nha Trang bay. 109 strains of Vibrio, Salmonella-Shigella and Aeromonas groups were isolated in the surr...

Microbial communities associated with invertebrates had been considered as a new source of bioactive compounds. The soft coral associated bacteria in Mot island, Nha Trang bay were isolated, extracted and assessed for antagonistic activity against human and coral pathogens, the strongly active strains were identified by 16S rRNA analysis. The soft...

The uptake rate of nitrate by leaves and roots was simultaneously investigated in the seagrass T. hemprichii collected from Lo river, Nha Trang. The principle of nutrient uptake of seagrass was based on the approaches of the Michaelis-Menten model. The laboratory experiments of nitrate uptake were done the ranges of ambient nitrate concentrations i...

Coral associated bacteria and their host are currently one of the interested issues for research and scientists worldwide. The densities of zooxanthellae and bacteria associated with three most prevalent species Acropora hyacinthus, Acropora muricata and Acropora robusta in Hang Rai, Ninh Thuan was evaluated over time by staining with SYBR Gold and...

The authors regret not adding following Acknowledgement < Acknowledgement This study was a collaboration between Stockholm University and the Institute of Oceanography, Nha Trang. It was partly supported by the project VAST06.02/16-17 leaded by Hanh Nguyen-Kim. >. The authors would like to apologise for any inconvenience caused.

In recent years, coral associated viruses could play primal role in protecting coral health, yet their ecological traits are poorly investigated. In this study, the abundance and life cycles (lysogeny and lytic) of viruses associated with contrasted coral health states (healthy and bleached) were studied and compared. In addition, the density of ba...

Drug resistance is now an issue of deep scientific concern all over the world as more antibiotic resistant bacteria have been detected in many regions and countries in recent years. Using of antibiotics for aquaculture is quite common in developing countries including Vietnam. This causes the spread of antibiotic resistant bacteria in the environme...

This paper is concerned with composition and antibacterial activities of ethyl acetate extracts from 3 species of Laurencia (Rhodophyta): Laurencia papillosa, Laurencia flexilis and Laurencia cartilaginea collected from the southern coasts of Vietnam. The results showed that ethyl acetate (EtOAc) extracts of these species displayed antibacterial ac...

Coral associated bacteria and their role for the host are currently one of the interested issues for research and scientists worldwide. Search of associated bacteria with some species of hard coral in Hang Rai, Ninh Thuan found that the strain VK2 was the most abundant culture from Acropora hyacinthus. This bacterium was implicated to further study...

Several papers have reported on the development of antibiotic resistance and implications for human medicine but fewer deal with environmental impacts of antibiotic use. Marine sea cage aquaculture in SE Asia is often established close to coral reef ecosystems. Large amounts of antibiotics are used in the cultivation of fish and lobster and hence r...

The periodic rise in seawater temperature is one of the main environmental determinants of coral bleaching. However, the direct incidence of these episodic thermal anomalies on coral-associated microbiota and their subsequent effects on coral health are still not completely understood. In this study, we investigated the dynamics of three main micro...

There is increasing suspicion that viral communities play a pivotal role in maintaining coral health, yet their main ecological traits still remain poorly characterized. In this study, we examined the seasonal distribution and reproduction pathways of viruses inhabiting the mucus of the scleractinians Fungia repanda and Acropora formosa collected i...

A recent hypothesis considers that many coral pathologies are the result of a sudden structural alteration of the epibiotic bacterial communities in response to environmental disturbances. However, the ecological mechanisms that lead to shifts in their composition are still unclear. In the ocean, viruses represent a major bactericidal agent but lit...

A recent hypothesis considers that many coral pathologies are the result of a sudden structural alteration of the epibiotic bacterial communities in response to environmental disturbances. However, the ecological mechanisms that lead to shifts in their composition are still unclear. In the ocean, viruses represent a major bactericidal agent but lit...

Viruses attract increasing interest from environmental microbiologists seeking to understand their function and role in coral health. However, little is known about their main ecological traits within the coral holobiont. In this study, a quantitative and qualitative characterization of viral and bacterial communities was conducted on the mucus of...

Community level physiological profile is a strong tool in bacteria research, especially in monitoring of waste water treatment or soil bacteria. This paper is one of few research using Biolog Eco Plates TM on natural marine waters to investigate functional diversity of bacteria community at different sites in Nhatrang Bay (Cai estuary, middle and m...

Effects of organic-waste loading from fish farming on benthic metabolism and nitrogen (N) cycling were studied in the tropical Nha Phu Estuary, Vietnam. The loading of fish excreta and feed waste enhanced benthic oxygen (O-2) uptake two times and total carbon dioxide (TCO2) release three times, compared with the reference station. NH4+ was the majo...