Track topics on Twitter Track topics that are important to you
Microplastics are hardly biodegradable and thus accumulate rather than decompose in the environment. Due to sedimentation processes, meiobenthic fauna is exposed to microplastics. Within the meiofauna, nematodes are a very abundant taxon and occupy an important position in benthic food webs by connecting lower and higher trophic levels. However, the key determinants of the uptake of microplastics by freshwater nematodes are still unknown. To investigate the bioaccessibility of microplastics for nematodes, we performed single- and multi-species ingestion experiments in which the ability of seven nematode species (six bacterial and one fungal feeder), diverse in their buccal cavity morphology (1.3-10.5 μm), to ingest fluorescence-labelled polystyrene (PS) beads along with their natural diet was examined. Applied beads sizes (0.5, 1.0, 3.0 and 6.0 μm), exposure time (4, 24 and 72 h) and concentration (3 × 10 PS beads ml and 10 PS beads ml) were varied. Ingested beads were localized and quantified via fluorescence microscopy in the nematodes. In contrast to fungal-feeding nematode species with a stylet, bacterial-feeding species ingested 0.5- and 1.0-μm PS beads with up to 249 and 255 beads after 24 h, respectively. Microplastics ≥0.5 μm could only be ingested and transported into the gastrointestinal tract, if the buccal cavities were considerably (>1.3 times) larger than the beads. At concentrations of 10 PS beads ml ingestion rates were influenced by exposure time and PS bead concentration. In case of a known microplastic size distribution in the environment, predictions on the potential ingestion for nematode communities can be made based on the feeding type composition and the size of their buccal cavities.
This article was published in the following journal.
Name: Environmental pollution (Barking, Essex : 1987)
Ingestion of microplastics can impair nutrition of marine invertebrates. In a laboratory study, we tested whether microplastics affect ingestion rates and gastrointestinal enzyme activities in the mar...
Microplastics are ubiquitous in natural environments. Ingestion of microplastics has been described in marine organisms, whereby particles may enter the food chain.
The present study characterized the buccal cavity-emptying and gastric-emptying kinetics of orally disintegrating tablets (ODTs) in fasted humans using gamma scintigraphy. Indium-diethylenetriaminepen...
The impacts of microplastic particulates in benthic freshwater organisms have been largely unexplored despite abundant plastic accumulation in the sediments of these systems. We investigated the uptak...
Feeding is fundamental to any heterotroph organism; in its role to quell hunger it overrides most other motivational states. But feeding also literally opens the door to harmful risks, especially for ...
The purpose of this study is to determine if naso-jejunal feeding (feeding beyond the stomach) improves the efficacy of enteral feeding (feeding into the gut) in critically ill patients. ...
Tumors in the oral region occur more frequently in men over 40, but can affect people of both sexes and all ages, even children. The prevention of oral cancer acquires relevance in public ...
In this study, we want to see how feeding affects breathing in small premature babies. Using a special feeding tube in the stomach, we can measure how the diaphragm (a large breathing musc...
This is a randomized non-blinded comparison of dorsal vs. ventral approach for buccal mucosa graft urethroplasty in the bulbar urethra. Buccal mucosa graft is a common method of repairing ...
In the nutrition guideline (A.S.P.E.N guideline), there was no recommendation about the feeding type in enteral feeding of critically ill patients. Continuous feeding is the most popular f...
A superfamily of nematodes of the suborder CAMALLANINA. Its organisms possess a poorly developed buccal cavity and a rudimentary esophagus and intestine.
A strategy for purchasing health care in a manner which will obtain maximum value for the price for the purchasers of the health care and the recipients. The concept was developed primarily by Alain Enthoven of Stanford University and promulgated by the Jackson Hole Group. The strategy depends on sponsors for groups of the population to be insured. The sponsor, in some cases a health alliance, acts as an intermediary between the group and competing provider groups (accountable health plans). The competition is price-based among annual premiums for a defined, standardized benefit package. (From Slee and Slee, Health Care Reform Terms, 1993)
A suborder of protozoa characterized by peniculi, which are often situated deep in the buccal cavity, and by fusiform trichocysts.
An order of ciliate protozoa. Characteristics include a ventral oral area and a well-defined buccal cavity. It comprises three suborders: TETRAHYMENINA, Ophryoglenina, and PENICULINA.
A genus of parasitic nematodes that occurs in mammals including man. Infection in humans is either by larvae penetrating the skin or by ingestion of uncooked fish.
Food is any substance consumed to provide nutritional support for the body. It is usually of plant or animal origin, and contains essential nutrients, such as carbohydrates, fats, proteins, vitamins, or minerals. The substance is ingested by an organism ...