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JOURNAL ARTICLE
Fuzhong Xiong, Tianjiao Dai, Yuhan Zheng, Donghui Wen, Qilin Li
Quorum sensing (QS)-based manipulations emerge as a promising solution for biofilm reactors to overcome challenges from inefficient biofilm formation and lengthy start-ups. However, the ecological mechanisms underlying how QS regulates microbial behaviors and community assembly remain elusive. Herein, by introducing different levels of N-acyl-homoserine lactones, we manipulated the strength of QS during the start-up of moving bed biofilm reactors and compared the dynamics of bacterial communities. We found that enhanced QS elevated the fitness of fast-growing bacteria with high ribosomal RNA operon (rrn) copy numbers in their genomes in both the sludge and biofilm communities...
April 30, 2024: Water Research
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JOURNAL ARTICLE
Shivani Balasaheb Patil, Sargun Tushar Basrani, Sayali Ashok Chougule, Tanjila Chandsaheb Gavandi, Sankunny Mohan Karuppayil, Ashwini Khanderao Jadhav
The prevalence of Candida albicans infection has increased during the past few years, which contributes to the need for new, effective treatments due to the increasing concerns regarding antifungal drug toxicity and multidrug resistance. Butyl isothiocyanate (butylITC) is a glucosinolate derivative, and has shown a significant antifungal effect contrary to Candida albicans. Additionally, how butylITC affects the virulence traits of C. albicans and molecular mode of actions are not well known. Present study shows that at 17...
May 10, 2024: Archives of Microbiology
#3
JOURNAL ARTICLE
Jian Wang, Yutong Guo, Wenju Lu, Xinyue Liu, Jingfeng Zhang, Jihong Sun, Guihong Chai
Pseudomonas aeruginosa (PA), a predominant pathogen in lung infections, poses significant challenges due to its biofilm formation, which is the primary cause of chronic and recalcitrant pulmonary infections. Bacteria within these biofilms exhibit heightened resistance to antibiotics compared to their planktonic counterparts, and their secreted toxins exacerbate lung infections. Diverging from traditional antibacterial therapy for biofilm eradication, this study introduces a novel dry powder inhalation containing muco-inert ciprofloxacin and colistin co-encapsulated liposomes (Cipro-Col-Lips) prepared using ultrasonic spray freeze drying (USFD) technique...
May 7, 2024: International Journal of Pharmaceutics
#4
JOURNAL ARTICLE
Tore Mo-Bjørkelund, Sanna Majaneva, Glaucia Moreira Fragoso, Geir Johnsen, Martin Ludvigsen
Expanding spatial presentation from two-dimensional profile transects to three-dimensional ocean mapping is key for a better understanding of ocean processes. Phytoplankton distributions can be highly patchy and the accurate identification of these patches with the context, variability, and uncertainty of measurements on relevant scales is difficult to achieve. Traditional sampling methods, such as plankton nets, water samplers and in-situ vertical sensors, provide a snapshot and often miss the fine-scale horizontal and temporal variability...
2024: PloS One
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JOURNAL ARTICLE
Clarissa Karthäuser, Paul D Fucile, Amy E Maas, Leocadio Blanco-Bercial, Hannah Gossner, Daniel P Lowenstein, Yuuki J Niimi, Benjamin A S Van Mooy, Joan M Bernhard, Ken O Buesseler, Stefan M Sievert
Sinking or floating is the natural state of planktonic organisms and particles in the ocean. Simulating these conditions is critical when making measurements, such as respirometry, because they allow the natural exchange of substrates and products between sinking particles and water flowing around them and prevent organisms that are accustomed to motion from changing their metabolism. We developed a rotating incubator, the RotoBOD (named after its capability to rotate and determine biological oxygen demand, BOD), that uniquely enables automated oxygen measurements in small volumes while keeping the samples in their natural state of suspension...
May 8, 2024: Environmental Science & Technology
#6
JOURNAL ARTICLE
Louise Dahl Hultqvist, Jens Bo Andersen, Carl Martin Nilsson, Charlotte Uldahl Jansen, Morten Rybtke, Tim Holm Jakobsen, Thomas Eiland Nielsen, Klaus Qvortrup, Claus Moser, Michael Graz, Katrine Qvortrup, Tim Tolker-Nielsen, Michael Givskov
Persistent urinary tract infections (UTIs) in hospitalized patients constitute an important medical problem. It is estimated that 75% of nosocomial UTIs are associated with urinary tract catheters with P. aeruginosa being a species that forms biofilms on these catheters. These infections are highly resistant to standard-of-care antibiotics, and the effects of the host immune defenses, which allows for development of persistent infections. With antibiotics losing their efficacy, new treatment options against resilient infections, such as catheter-associated urinary tract infections (CAUTIs), are critically needed...
May 8, 2024: Antimicrobial Agents and Chemotherapy
#7
JOURNAL ARTICLE
Kyra E Groover, Justin R Randall, Bryan W Davies
Antimicrobial peptides (AMPs) are presented as potential scaffolds for antibiotic development due to their desirable qualities including broad-spectrum activity, rapid action, and general lack of susceptibility to current resistance mechanisms. However, they often lose antibacterial activity under physiological conditions and/or display mammalian cell toxicity, which limits their potential use. Identification of AMPs that overcome these barriers will help develop rules for how this antibacterial class can be developed to treat infection...
May 7, 2024: ACS Infectious Diseases
#8
JOURNAL ARTICLE
Natsumi Hookabe, Rei Ueshima, Toru Miura
BACKGROUND: Various morphological adaptations are associated with symbiotic relationships between organisms. One such adaptation is seen in the nemertean genus Malacobdella. All species in the genus are commensals of molluscan hosts, attaching to the surface of host mantles with a terminal sucker. Malacobdella possesses several unique characteristics within the order Monostilifera, exhibiting the terminal sucker and the absence of eyes and apical/cerebral organs, which are related to their adaptation to a commensal lifestyle...
May 6, 2024: Frontiers in Zoology
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JOURNAL ARTICLE
Noha Nafee, Dina M Gaber, Alaa Abouelfetouh, Mustafa Alseqely, Martin Empting, Marc Schneider
INTRODUCTION: Cystic fibrosis (CF) is associated with pulmonary Pseudomonas aeruginosa infections persistent to antibiotics. METHODS: To eradicate pseudomonal biofilms, solid lipid nanoparticles (SLNs) loaded with quorum-sensing-inhibitor (QSI, disrupting bacterial crosstalk), coated with chitosan (CS, improving internalization) and immobilized with alginate lyase (AL, destroying alginate biofilms) were developed. RESULTS: SLNs (140-205 nm) showed prolonged release of QSI with no sign of acute toxicity to A549 and Calu-3 cells...
2024: International Journal of Nanomedicine
#10
JOURNAL ARTICLE
Linda Huijboom, Parisa Rashtchi, Marcel Tempelaars, Sjef Boeren, Erik van der Linden, Mehdi Habibi, Tjakko Abee
Lactiplantibacillus plantarum is a Gram-positive non-motile bacterium capable of producing biofilms that contribute to the colonization of surfaces in a range of different environments. In this study, we compared two strains, WCFS1 and CIP104448, in their ability to produce biofilms in static and dynamic (flow) environments using an in-house designed flow setup. This flow setup enables us to impose a non-uniform flow velocity profile across the well. Biofilm formation occurred at the bottom of the well for both strains, under static and flow conditions, where in the latter condition, CIP104448 also showed increased biofilm formation at the walls of the well in line with the higher hydrophobicity of the cells and the increased initial attachment efficacy compared to WCFS1...
June 2024: Biofilm
#11
JOURNAL ARTICLE
Huatao Yuan, Ling Li, Yujie Wang, Senjie Lin
Harmful algal bloom (HAB) is a rapidly expanding marine ecological hazard. Although numerous studies have been carried out about the ecological impact and the ecological mechanism of HAB outbreaks, few studies have comprehensively addressed the shifts of species composition, metabolic activity level, driving factors and community assembly mechanisms of microeukaryotic plankton in the course of the bloom event. To fill the gap of research, we conducted 18S ribosomal DNA and RNA sequencing during the initiation, development, sustenance and decline stages of a Scrippsiella acuminata (S...
April 2024: Harmful Algae
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JOURNAL ARTICLE
Eva Pérez Blanco, Paulo Sérgio Salomon, Per Carlsson, Cathérine Legrand, Edna Granéli
In the North Sea, Tripos and Dinophysis are commonly occurring mixotrophic planktonic dinoflagellate genera. In order to understand their bloom dynamics, an occurring bloom dominated by T. furca and D. norvegica was followed for several days. High cell abundances of these species were located to estimate: in situ growth rates from cell cycle analyses, depth distributions, growth rates sustained by photosynthesis, and parasite infection prevalence in all T. furca, T. fusus, D. norvegica and D. acuminata. Cell abundances were over 10000 cells L-1 for T...
April 2024: Harmful Algae
#13
JOURNAL ARTICLE
Jared P Vigil, Matthew S Schuler
Anthropogenic activities such as the over-application of road deicers are causing an increase in the concentration of salts in historically fresh waters. Experimental and field investigations demonstrate that freshwater salinization disrupts ecosystem functions and services, causing the death of freshwater organisms and changes to nutrient conditions. Wetland habitats are one system negatively affected by salt pollution, including ephemeral wetlands (vernal pools) that fill with salt-polluted water after snowmelt...
May 2, 2024: Science of the Total Environment
#14
JOURNAL ARTICLE
Ahmed N Alabssawy, Mohammed Abu-Elghait, Ahmad M Azab, Hassan M M Khalaf-Allah, Abdelrahman S Ashry, Ahmed O M Ali, Abu-Bakr A A Sabra, Salem S Salem
Scientists know very little about the mechanisms underlying fish skin mucus, despite the fact that it is a component of the immune system. Fish skin mucus is an important component of defence against invasive infections. Recently, Fish skin and its mucus are gaining interest among immunologists. Characterization was done on the obtained silver nanoparticles Ag combined with Clarias gariepinus catfish epidermal mucus proteins (EMP-Ag-NPs) through UV-vis, FTIR, XRD, TEM, and SEM. Ag-NPs ranged in size from 4 to 20 nm, spherical in form and the angles were 38...
May 4, 2024: BMC Biotechnology
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JOURNAL ARTICLE
Guang Yang, Da-Yuan Wang, Jianwen Song, Yijin Ren, Yingli An, Henk J Busscher, Henny C van der Mei, Linqi Shi
Cascade-reaction containers generating reactive oxygen species (ROS) as an alternative for antibiotic-based strategies for bacterial infection control, require endogenous oxygen-sources and ROS-generation close to or preferably inside target bacteria. Here, this is achieved by cetyltrimethylammonium-chloride (CTAC) assisted in situ metabolic labeling and incorporation of mesoporous SiO2 -nanoparticles, dual-loaded with glucose-oxidase and Fe3 O4 -nanoparticles as cascade-reaction containers, inside bacterial cell walls...
May 1, 2024: Acta Biomaterialia
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JOURNAL ARTICLE
Al-Auqadi Rahma S, Mohamed W Alkhafaji, Ali I Al-Juboury, Alex Zumberge, Nasir Alarifi, Dan Jarvie, Giovanni Zanoni, Harry Rowe
The Ora Formation (late Devonian-early Carboniferous) is thought to be a potential source rocks for the Paleozoic petroleum system of Iraq. The source potential from the Ora Formation is evaluated for the first time ever in this study from western and northern Iraq which integrates data from organic geochemistry including Total Organic Carbon (TOC) analysis, HAWK pyrolysis, gas chromatography (GC), and gas chromatography mass spectrometry (GC-MS) and mineralogical X-ray diffraction and scanning electron microscopy...
April 30, 2024: Heliyon
#17
JOURNAL ARTICLE
Freya C Womersley, Christoph A Rohner, Katya Abrantes, Pedro Afonso, Shin Arunrugstichai, Steffen S Bach, Shir Bar, Adi Barash, Peter Barnes, Adam Barnett, Ginevra Boldrocchi, Noemie Buffat, Tom Canon, Clara Canovas Perez, Metavee Chuangcharoendee, Jesse E M Cochran, Rafael de la Parra, Stella Diamant, William Driggers, Christine Dudgeon, Mark V Erdmann, Richard Fitzpatrick, Anna Flam, Jorge Fontes, Gemma Francis, Beatriz Eugenia Galvan, Rachel Graham, Sofia M Green, Jonathan R Green, Ya'ara Grosmark, Hector M Guzman, Royale S Hardenstine, Maria Harvey, Jessica Harvey-Carroll, Abdi Wunanto Hasan, Alex R Hearn, Jill M Hendon, Mochamad Iqbal Herwata Putra, Mahardika Rizqi Himawan, Eric Hoffmayer, Jason Holmberg, Hua Hsun Hsu, Mohammed Y Jaidah, Ashlee Jansen, Christy Judd, Baraka Kuguru, Emily Lester, Bruno C L Macena, Kirsty Magson, Rossana Maguiño, Mabel Manjaji-Matsumoto, Stacia Marcoux, Travis Marcoux, Jennifer McKinney, Mark Meekan, Alejandra Mendoza, Muhammad Moazzam, Emily Monacella, Brad Norman, Cameron Perry, Simon Pierce, Clare Prebble, Dení Ramírez Macías, Holly Raudino, Samantha Reynolds, David Robinson, David Rowat, Mudjekeewis D Santos, Jennifer Schmidt, Chad Scott, Sian Tian See, Abraham Sianipar, Conrad W Speed, Ismail Syakurachman, Julian A Tyne, Kelly Waples, Chloe Winn, Ranny R Yuneni, Irthisham Zareer, Gonzalo Araujo
The expansion of the world's merchant fleet poses a great threat to the ocean's biodiversity. Collisions between ships and marine megafauna can have population-level consequences for vulnerable species. The Endangered whale shark (Rhincodon typus), shares a circumglobal distribution with this expanding fleet and tracking of movement pathways has shown that large vessel collisions pose a major threat to the species. However, it is not yet known whether they are also at risk within aggregation sites, where up to 400 individuals can gather to feed on seasonal bursts of planktonic productivity...
April 30, 2024: Science of the Total Environment
#18
JOURNAL ARTICLE
Yaumel C Arias-Sosa, Gelaysi Moreno-Vega, Rubens M Lopes, José-Luis Valin-Rivera, Meylí Valin-Fernández, Edison Gonçalves, Jorge O Ricardo-Pérez
This work utilizes a Gabor Holographic Optical Scheme integrated with a microscope objective and a thin convex plane lens. This bi-telecentric lens system corrects spherical aberration from the objective, maintains consistent magnification across various reconstruction distances, and ensures a plane incidence on CMOS. Depending on the focal lengths of the objective and lens, the final image can be enlarged or reduced compared to the classic Gabor system, resulting in high-quality reconstructed phase images without spherical aberration...
May 15, 2024: Heliyon
#19
JOURNAL ARTICLE
Qiuyun Zhao, Yangyang Zhang, Xiuwen Li, Xiaodong Hu, Rui Huang, Jixiong Xu, Zilong Yin, Xinjie Gu, Yuncheng Xu, Jinbao Yin, Qing Zhou, Aimin Li, Peng Shi
Evaluating the health of river surface water is essential, as rivers support significant biological resources and serve as vital drinking water sources. While the Water Quality Index (WQI) is commonly employed to evaluate surface water quality, it fails to consider biodiversity and does not fully capture the ecological health of rivers. Here we show a comprehensive assessment of the ecological health of surface water in the lower Yangtze River (LYR), integrating chemical and biological metrics. According to traditional WQI metrics, the LYR's surface water generally meets China's Class II standards...
September 2024: Environ Sci Ecotechnol
#20
JOURNAL ARTICLE
Rashmi Pandey, Vicente Pinon, Mark Garren, Patrick Maffe, Arnab Mondal, Elizabeth J Brisbois, Hitesh Handa
Biomedical devices are vulnerable to infections and biofilm formation, leading to extended hospital stays, high expenditure, and increased mortality. Infections are clinically treated via the administration of systemic antibiotics, leading to the development of antibiotic resistance. A multimechanistic strategy is needed to design an effective biomaterial with broad-spectrum antibacterial potential. Recent approaches have investigated the fabrication of innately antimicrobial biomedical device surfaces in the hope of making the antibiotic treatment obsolete...
May 2, 2024: ACS Applied Materials & Interfaces
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