Hernando Pactao Bacosa

Hernando Pactao Bacosa
Texas A&M University - Galveston | TAMUG

Doctor of Philosophy

About

52
Publications
9,668
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,297
Citations
Introduction

Publications

Publications (52)
Article
The emergence of the COVID-19 pandemic has caused worldwide health constraints. This study was conducted to establish a baseline monitoring survey to describe the distribution of PPE litters during the COVID-19 pandemic in the province of Palawan, Philippines. A total of 386 COVID-19-related PPE items were present in 83 % of coastal sampling sites...
Article
Full-text available
Over the past century, the demand for petroleum products has increased rapidly, leading to higher oil extraction, processing and transportation, which result in numerous oil spills in coastal-marine environments. As the spilled oil can negatively affect the coastal-marine ecosystems, its transport and fates captured a significant interest of the sc...
Article
Full-text available
Over the past century, the demand for petroleum products has increased rapidly, leading to higher oil extraction, processing and transportation, which result in numerous oil spills in coastal-marine environments. As the spilled oil can negatively affect the coastal-marine ecosystems, its transport and fates captured a significant interest of the sc...
Article
Full-text available
Despite the potentially huge contributions that coastal communities might make in marine resource management and sustainability, their participation in such efforts have only been recognized recently, particularly in Southeast Asia. Involving community perceptions can offer new insights for policy makers and resource managers and can elicit strong...
Article
Marine plastic litter pollution has become an emerging threat to the Philippines, especially in Palawan. This study was conducted to investigate the macroplastic litter and determine the clean-coast index (CCI) of the residential and non-residential sites on the coasts of Puerto Princesa, Palawan. Plastic litters were sampled from 21 coastal barang...
Article
Full-text available
The contamination of the environment by crude oil and its by-products, mainly composed of aliphatic and aromatic hydrocarbons, is a widespread problem. Biodegradation by bacteria is one of the processes responsible for the removal of these pollutants. This study was conducted to determine the abilities of Burkholderia sp. B5, Cupriavidus sp. B1, Ps...
Preprint
Full-text available
The contamination of the environment by crude oil and its by-products, which mainly composed of aliphatic and aromatic hydrocarbons, is a widespread problem. Biodegradation by bacteria is one of the processes responsible for the removal of these pollutants. This study was conducted to determine the abilities of Burkholderia sp. B5, Ralstonia sp. B1...
Article
During oil spills in the field or for laboratory incubation studies, different oil concentrations are often encountered or applied, yet how initial oil concentration affects biodegradation rates of hydrocarbons and the development of oil degraders remains unclear. We incubated seawater for 50 d with different oil concentrations (0, 50, 100, 200, 40...
Article
Full-text available
Marine snow was implicated in the transport of oil to the seafloor during the Deepwater Horizon oil spill, but the exact processes remain controversial. In this study, we investigated the concentrations and distributions of the 16 USEPA priority polycyclic aromatic hydrocarbons (PAHs) in marine snow aggregates collected during a mesocosm experiment...
Article
Full-text available
Hurricane Harvey was the wettest hurricane in US history bringing record rainfall and widespread flooding in Houston, TX. The resulting storm- and floodwaters largely emptied into the Galveston Bay. Surface water was collected from 10 stations during five cruises to investigate the concentrations and sources of 16 priority polycyclic aromatic hydro...
Article
This study aimed to determine the effectiveness of Morinda citrifolia (Noni) leaf extract as corrosion inhibitor for steel-reinforced concrete exposed to saline environment. Chloride ingress in concrete structures exposed to saline environment that leads to corrosion of steel reinforcement is prevalent in many countries including the Philippines. T...
Article
The association between phytoplankton blooms and oil spills is still controversial despite numerous studies. Surprisingly, to date, there have been no studies on the effect of bacterial communities (BCs) exposed to crude oil on phytoplankton growth, even though crude oil changes BCs, which can then affect phytoplankton growth and species compositio...
Article
Full-text available
Hurricane Harvey (category four storm) made landfall along the coast of Texas (United States) and then stalled out over Texas and Louisiana, releasing 1.29 × 1011 m3 of precipitation over 5 days. This caused extensive flooding that elevated freshwater river discharge and land runoff into Galveston Bay and eventually into the Gulf of Mexico. The flo...
Article
Extracellular polymeric substances (EPS) released from marine microbial cells is a major response to stress. Most previous studies focus on the quantity of EPS released from microbes; however, the critical characteristic of EPS composition receive much less attention. Considering the complex nature and diversity of microbes in the marine system als...
Article
Microbially secreted exopolymeric substances (EPS), rich in polysaccharides and proteins, make up an important part of natural organic matter in the ocean, especially marine snow. While the attention in the oceanographic literature is focused more on the role of polysaccharides and less of proteins in EPS functions, the role of proteins, especially...
Article
The diatom genus Pseudo-nitzschia is a common component of phytoplankton communities in the Gulf of Mexico and is potentially toxic as some species produce the potent neurotoxin domoic acid. The impact of oil and chemical dispersants on Pseudo-nitzschia spp. and domoic acid production have not yet been studied; preliminary findings from a mesocosm...
Article
Diatoms secrete a significant amount of polysaccharides, which can serve as a critical organic carbon source for bacteria. The 2010 Deepwater Horizon oil spill exposed the Gulf of Mexico to substantial amounts of oil that also impacted the phytoplankton community. Increased production of exopolymeric substances was observed after this oil spill. Po...
Article
Full-text available
Sinking marine oil snow was found to be a major mechanism in the transport of spilled oil from the surface to the deep sea following the Deepwater Horizon (DwH) oil spill. Marine snow formation is primarily facilitated by extracellular polymeric substances (EPS), which are mainly composed of proteins and carbohydrates secreted by microorganisms. Wh...
Data
Image of isolate W14 under the scanning electron microscope (SEM) with its EPS produced by exposure to WAF. (PDF)
Data
Lipase activity in WAF, CEWAF and Corexit after 4 d of incubation with the bacterial isolates. The values are ratios relative to Controls. (PDF)
Data
Concentration of n-alkanes in control and bottles inoculated with bacterial isolates after 4 d of incubation. Error bars represent the standard deviation of three replicates. (PDF)
Data
Alkaline phosphatase activity in WAF, CEWAF and Corexit after 4 d of incubation with the bacterial isolates. The values are ratios relative to Controls. (PDF)
Data
Concentration of PAHs in control and bottles inoculated with bacterial isolates after 4 d of incubation. Error bars represent the standard deviation of three replicates. (PDF)
Article
Full-text available
Field data from the first several days after an oil spill is rare but crucial for our understanding of a spill’s impact on marine microbiota given their short generation times. Field data collected within days of the Texas City “Y” oil spill showed that exposure to crude oil can rapidly imbalance populations of marine microbiota, which leads to the...
Article
In response to the Deepwater Horizon oil spill, critical research has tracked the changes in petroleum hydrocarbons with environmental weathering. There are limitations, however, whereby single analytical techniques cannot always identify the wide breadth of petroleum and petroleum-derived compounds. We explore the analytical capabilities of ramped...
Article
The Deepwater Horizon (DWH) blowout resulted in the deposition to the seafloor of up to 4.9% of 200 million gallons of oil released into the Gulf of Mexico. The petroleum hydrocarbon concentrations near the wellhead were high immediately after the spill, but returned to background levels a few years after the spill. Microbial communities in the sea...
Article
During the Deepwater Horizon oil spill, a large amount of marine oil snow (MOS) was formed in surface waters of the Gulf of Mexico (GOM) that eventually settled to the bottom. MOS consists of a microbially colonized matrix of extracellular polymeric substances (EPS), to which cells, and both ionic (e.g., trace nutrients, Ca²⁺) and non-ionic (e.g.,...
Chapter
The Deepwater Horizon Oil Spill (DWH) is recognized as the worst oil spill in the U.S. history and resulted to the release of more than 4.9 million barrels of Macondo crude oil into the Gulf of Mexico. From the depth of 1500. m, oil was deposited to the seafloor, formed a plume in the deep water, ascended to the surface, and contaminated the coasta...
Article
Ongoing bioremediation research seeks to promote naturally occurring microbial polycyclic aromatic hydrocarbon (PAH) degradation during and after oil spill events. However, complex relationships among functionally different microbial groups, nutrients and PAHs remain unconstrained. We conducted a surface water survey and corresponding nutrient amen...
Article
Full-text available
Understanding bacterial community dynamics as a result of an oil spill is important for predicting the fate of oil released to the environment and developing bioremediation strategies in the Gulf of Mexico. In this study, we aimed to elucidate the roles of temperature, water chemistry (nutrients), and initial bacterial community in selecting oil de...
Article
In order to characterize the state of oil spill research and describe how the field has changed since its inception in the 1960s and since the Deepwater Horizon spill in 2010, we examined approximately 10% of oil spill literature (1255 of over 11,000 publications) published from 1968 to 2015. We find that, despite its episodic nature, oil spill res...
Article
Full-text available
Significance and impact of the study: In the environment, oil spills have the capacity to modify phytoplankton communities, with important consequences on the food web and the carbon cycle. We are just beginning to understand the oil resistance of phytoplankton species, making it difficult to predict community response. In this study we highlighte...
Article
We modeled the transport of oil, source-fingerprinted 44 tarball samples from Galveston Island (GV) and Mustang Island (MT), and determined the hydrocarbon and bacterial community composition of these tarballs following the 2014 Texas City “Y” Oil Spill (TCY). Transport modeling indicated that the tarballs arrived in MT before the samples were coll...
Article
Full-text available
Following the Deepwater Horizon (DWH) spill in 2010, an enormous amount of oil was observed in the deep and surface waters of the northern Gulf of Mexico. Surface waters are characterized by intense sunlight and high temperature during summer. While the oil-degrading bacterial communities in the deep-sea plume have been widely investigated, the eff...
Research
Full-text available
Bacterial community dynamics during the preferential degradation of aromatic hydrocarbons by a microbial consortium
Article
Full-text available
Mangroves constitute valuable coastal resources that are vulnerable to oil pollution. One of the major processes to remove oil from contaminated mangrove sediment is microbial degradation. A study on heavy oil- and hydrocarbon-degrading bacterial consortia from mangrove sediments in Okinawa, Japan was performed to evaluate their capacity to biodegr...
Article
The aims of this study were to identify the bacteria responsible for the rapid degradation of aromatic hydrocarbons, and to determine the roles of bacterial species in the microbial consortium. The population changes of the four major bacterial groups, namely Burkholderia spp., Achromobacter spp./Alcaligenes spp., Cupriavidus spp., and Rhodanobacte...
Article
In this study, the abilities of two microbial consortia (Y and F) to degrade aliphatic–aromatic hydrocarbon mixtures were investigated. Y consortium preferentially degraded the aromatic hydrocarbon fractions in kerosene, while F consortium preferentially degraded the aliphatic hydrocarbon fractions. Degradation experiments were performed under aero...
Article
Numerous studies on the biodegradation of petroleum products using total petroleum hydrocarbons (TPH) have been carried out; however, the biodegradation of equivalent carbon number (EC) based hydrocarbon fractions in mineral oil has attracted little attention. This study investigated the ability of a microbial consortium to degrade the EC fractions...
Article
This paper describes about microbial diversity in an iron oxidation tank of an AMD treatment plant established at an abandoned sulphur mine in Japan. Since the mining operation was stopped, this mine has produced strong acidic mine drainage, pH 1.8, including a high concentration of ferrous iron, 301mg/L, and the flow rate was about 4m3/min. In 200...

Questions

Question (1)
Question
I am using vapor deposition for amino-silanization by APTES (3-aminopropyltriethoxysilane). I have noticed in literature that the 99.5% purity APTES is used as received for vapor deposition in silicon wafers under N2 in desiccator. However, when Argon is used, APTES is distilled first prior to vapor deposition. is it really necessary to distill APTES for vapor deposition under N2 or Argon? Any help is appreciated.

Projects

Project (1)