Results 31 to 40 of about 80,172 (249)

Comparative Transcriptomics Reveals Distinct Gene Expressions of a Model Ciliated Protozoan Feeding on Bacteria-Free Medium, Digestible, and Digestion-Resistant Bacteria

Microorganisms, 2020
Bacterivory is an important ecological function of protists in natural ecosystems. However, there are diverse bacterial species resistant to protistan digestion, which reduces the carbon flow to higher trophic levels.
Songbao Zou, Qianqian Zhang, Jun Gong
doaj   +1 more source

Examination of the role of the microbial loop in regulating lake nutrient stoichiometry and phytoplankton dynamics [PDF]

Biogeosciences, 2014
The recycling of organic material through bacteria and microzooplankton to higher trophic levels, known as the "microbial loop", is an important process in aquatic ecosystems.
Y. Li, G. Gal, V. Makler-Pick, A. M. Waite, L. C. Bruce, M. R. Hipsey   +5 more
doaj   +1 more source

Morphological and molecular analyses of season-specific responses of freshwater ciliate communities to top-down and bottom-up experimental manipulations

mSystems
In aquatic microbial food webs, ciliates represent an important trophic link in the energy transfer from prokaryotes, algae, and heterotrophic nanoflagellates (HNFs) to higher trophic levels. However, the trophic role of abundant small ciliates (
Usman Asghar, Indranil Mukherjee, Bettina Sonntag, Caio César Pires de Paula, Vojtěch Kasalický, Paul-Adrian Bulzu, Anusha Priya Singh, Tanja Shabarova, Kasia Piwosz, Karel Šimek   +9 more
doaj   +1 more source

C and P in aquatic food chain: A review on C:P stoichiometry and PUFA regulation

Knowledge and Management of Aquatic Ecosystems, 2010
Carbon (C) and phosphorous (P) regulation in aquatic food chains are transferred from lower to upper trophic levels primarily as polyunsaturated fatty acids (PUFAs) and C:P stoichiometry. The majority of C is transferred through algal
Saikia S.K., Nandi S.
doaj   +1 more source

Effect of water chemistry on zooplanktonic and microbial communities across freshwater ecotones in different macrophyte-dominated shallow lakes

Journal of Limnology, 2015
Complex interactions between zooplankton and microbial food webs are vital to the ecosystem ecology of shallow lakes. However, little is known about how horizontal changes in environmental conditions may influence microbial and metazoan communities in ...
Tomasz Mieczan, Małgorzata Adamczuk, Monika Tarkowska-Kukuryk, Dorota Nawrot   +3 more
doaj   +1 more source

The role of the microbial loop in Antarctic pelagic ecosystems [PDF]

Polar Research, 1991
The Paradigm pelagic food web organization in Antarctic waters is undergoing fundamental revision evidence that large fractions of material and energy flow through the microbial food web. because of the unique Antarctic ecosystem conditions, the microbial food web performs some roles that are fundamentally different from those in oligotrophic temperate
FAROOQ AZAM, DAVID C. SMITH, JAMES T. HOLLIBAUGH   +2 more
openaire   +1 more source

Relative importance of nanoflagellate grazing and viral lysis for the mortality of heterotrophic bacteria and Synechococcus spp. in a high-latitude fjord (Adventfjorden, Svalbard) during the summer

Polar Research
Viral lysis and grazing play crucial but distinct roles in microbial community dynamics and carbon cycling. Yet, their relative influence on the abundance of heterotrophic bacterial and picophytoplankton populations, especially in Arctic fjords, remains ...
Madeline Olivia, Ruei-Feng Shiu, Patrichka Wei-Yi Chen, Chia-Mei Chang, Clara Natalie Annabel, Chuen-Fa Ni, Hwa Chien, Slawomir Jack Giletycz, An-Yi Tsai   +8 more
doaj   +1 more source

Predominant Non-additive Effects of Multiple Stressors on Autotroph C:N:P Ratios Propagate in Freshwater and Marine Food Webs

Frontiers in Microbiology, 2018
A continuing challenge for scientists is to understand how multiple interactive stressor factors affect biological interactions, and subsequently, ecosystems–in ways not easily predicted by single factor studies.
Manuel Villar-Argaiz, Juan M. Medina-Sánchez, Bopaiah A. Biddanda, Presentación Carrillo   +3 more
doaj   +1 more source

Role of polymetallic-nodule dependent fauna on carbon cycling in the eastern Clarion-Clipperton Fracture Zone (Pacific)

Frontiers in Marine Science, 2023
The abyssal seafloor in the Clarion-Clipperton Fracture Zone (CCZ) in the central Pacific is covered with large densities of polymetallic nodules, i.e., metal concretions containing iron, manganese, nickel, cobalt, and copper.
Tanja Stratmann, Tanja Stratmann
doaj   +1 more source

Structural insights into an engineered feruloyl esterase with improved MHET degrading properties

FEBS Letters, EarlyView.
A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa, Konstantinos Makryniotis, Theofani‐Iosifina Sousani, Evangelos Topakas, Vangelis Daskalakis, Maria Dimarogona   +5 more
wiley   +1 more source