scholarly journals Downregulation of the microbial protein biosynthesis machinery in response to weeks, years, and decades of soil warming

2021 ◽  
Author(s):  
Andrea Söllinger ◽  
Joana Séneca ◽  
Mathilde Borg Dahl ◽  
Liabo L. Motleleng ◽  
Judith Prommer ◽  
...  
Keyword(s):  
Soil Microorganisms ◽  
Protein Biosynthesis ◽  
Reaction Rates ◽  
Climate Feedbacks ◽  
Soil Warming ◽  
Short Term ◽  
Metabolic Activities ◽  
Soil Climate ◽  
Substrate Concentrations

Abstract How soil microorganisms respond to global warming is key to infer future soil-climate feedbacks, yet poorly understood. Here we applied metatranscriptomics to investigate microbial physiological responses to medium- (8 years) and long-term (>50 years) subarctic grassland soil warming of +6 °C. Besides indications for a community-wide upregulation of central metabolisms and cell replication we observed a downregulation of the protein biosynthesis machinery in the warmed soils, coinciding with a lower microbial biomass, RNA, and soil substrate content. We conclude that permanently accelerated reaction rates at higher temperatures and reduced substrate concentrations results in a cellular reduction of ribosomes, the macromolecular complexes carrying out protein biosynthesis. Later efforts to test this, including a short-term warming experiment (6 weeks, +6 °C), further supported our conclusion. Downsizing the protein biosynthesis machinery facilitates liberation of energy and matter, allowing microorganisms to maintain high metabolic activities and cell division rates even after decades of warming.

scholarly journals Central metabolic responses of microorganisms to years and decades of soil warming

2021 ◽  
Author(s):  
Andrea Söllinger ◽  
Mathilde Borg Dahl ◽  
Joana Séneca ◽  
Judith Prommer ◽  
Erik Verbruggen ◽  
...  
Keyword(s):  
Energy Metabolism ◽  
Protein Biosynthesis ◽  
Reaction Rates ◽  
Soil Warming ◽  
Functional Richness ◽  
Common Response ◽  
Metabolic Activities ◽  
Induced Changes ◽  
Substrate Concentrations

Abstract Microbial physiological responses to long-term warming are poorly understood. Here we applied metatranscriptomics to investigate how microorganisms react to medium-term (8 years) and long-term (>5 decades) subarctic grassland soil warming of +6 °C. Decades, but not years, of warming induced changes in relative abundances of eukaryotic, prokaryotic, and viral transcripts and reduced functional richness. However, irrespective of the duration of warming, we observed a community-wide upregulation of central (carbon) metabolisms and cell replication in the warmed soils, whereas essential energy metabolism and protein biosynthesis complexes and pathways were downregulated. This coincided with a decrease of microbial biomass and lower soil substrate concentrations (e.g. dissolved organic carbon and phosphorus). We conclude that permanently accelerated reaction rates at higher temperatures facilitate a downregulation of energy metabolism and protein biosynthesis, potentially freeing energy and matter for substrate acquisition and growth. This resource allocation seems to be a common response in microorganisms and allows sustaining high metabolic activities and replication rates even after decades of soil warming.

Short-term response of soil microorganisms to biochar addition in a temperate agroecosystem under soil warming

2016 ◽  
Vol 233 ◽  
pp. 308-317 ◽  
Author(s):  
Chris Bamminger ◽  
Christian Poll ◽  
Christina Sixt ◽  
Petra Högy ◽  
Dominik Wüst ◽  
...  
Keyword(s):  
Soil Microorganisms ◽  
Soil Warming ◽  
Short Term ◽  
Term Response

scholarly journals Soil carbon loss in warmed subarctic grasslands is rapid and restricted to topsoil

2022 ◽  
Author(s):  
Niel Verbrigghe ◽  
Niki I. W. Leblans ◽  
Bjarni D. Sigurdsson ◽  
Sara Vicca ◽  
Chao Fang ◽  
...  
Keyword(s):  
Soil Carbon ◽  
Critical Role ◽  
Aggregate Size ◽  
Climate Feedbacks ◽  
Soil Warming ◽  
Soil C ◽  
Soc Stock ◽  
Mate System ◽  
Soc Stocks

Abstract. Global warming may lead to carbon transfers from soils to the atmosphere, yet this positive feedback to the cli- mate system remains highly uncertain, especially in subsoils (Ilyina and Friedlingstein, 2016; Shi et al., 2018). Using natural geothermal soil warming gradients of up to +6.4 °C in subarctic grasslands (Sigurdsson et al., 2016), we show that soil organic carbon (SOC) stocks decline strongly and linearly with warming (−2.8 ton ha−1 °C−1). Comparison of SOC stock changes following medium-term (5 and 10 years) and long-term (> 50 years) warming revealed that all SOC loss occurred within the first five years of warming, after which continued warming no longer reduced SOC stocks. This rapid equilibration of SOC observed in Andosol suggests a critical role for ecosystem adaptations to warming and could imply short-lived soil carbon-climate feedbacks. Our data further revealed that the soil C loss occurred in all aggregate size fractions, and that SOC losses only occurred in topsoil (0–10 cm). SOC stocks in subsoil (10–30 cm), where plant roots were absent, remained unaltered, even after > 50 years of warming. The observed depth-dependent warming responses indicate that explicit vertical resolution is a prerequisite for global models to accurately project future SOC stocks for this soil type and should be investigated for soils with other mineralogies.

scholarly journals Introduction of an adsorption process into a surface water treatment system and its effect on disinfectant use

2019 ◽  
Vol 19 (5) ◽  
pp. 1354-1362
Author(s):  
Małgorzata Wolska ◽  
Halina Urbańska-Kozłowska ◽  
Marek Mołczan
Keyword(s):  
Water Treatment ◽  
Surface Water ◽  
Reaction Rates ◽  
Treatment System ◽  
Water Tank ◽  
Organic Substances ◽  
Short Term ◽  
Surface Water Treatment ◽  
Time Period

Abstract The study was conducted in a full-scale water treatment facility where surface water is treated. The analysis of required disinfectant dosage changes and disinfectant usage was conducted in a time period starting 6 months before introducing adsorption on granular activated carbon (GAC) into the treatment system, and continuing for 6 months after adsorption introduction. During the analyzed time period, both chlorine and chlorine dioxide were used. They were dosed separately and rapidly mixed into a pipeline before the clean water tank. Both short-term and long-term disinfectant consumption was studied. This is due to the different reaction rates of the disinfecting agents used. Introducing GAC adsorption contributed significantly to limiting organic substances in water undergoing disinfection, which resulted in average reductions of 51% for both disinfectants. During the first month after introducing adsorption only a small increase in disinfectant demand was found, connected with an increase in 22 °C cultivated bacteria count in water to be disinfected. The increase in organic substances removal achieved by the use of adsorption did not result in a reduction of analyzed trihalomethanes (THM), whose concentrations were low for both cases and amounted to 2.1–7.9 μg/dm3 and 1.6–5.2 μg/dm3 with and without adsorption respectively.

scholarly journals Alaskan carbon-climate feedbacks will be weaker than inferred from short-term experiments

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Nicholas J. Bouskill ◽  
William J. Riley ◽  
Qing Zhu ◽  
Zelalem A. Mekonnen ◽  
Robert F. Grant
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Carbon Cycle ◽  
Field Experiments ◽  
Ecosystem Model ◽  
Climate Feedbacks ◽  
Short Term ◽  
Ecosystem Carbon ◽  
Tightly Coupled

AbstractClimate warming is occurring fastest at high latitudes. Based on short-term field experiments, this warming is projected to stimulate soil organic matter decomposition, and promote a positive feedback to climate change. We show here that the tightly coupled, nonlinear nature of high-latitude ecosystems implies that short-term (<10 year) warming experiments produce emergent ecosystem carbon stock temperature sensitivities inconsistent with emergent multi-decadal responses. We first demonstrate that a well-tested mechanistic ecosystem model accurately represents observed carbon cycle and active layer depth responses to short-term summer warming in four diverse Alaskan sites. We then show that short-term warming manipulations do not capture the non-linear, long-term dynamics of vegetation, and thereby soil organic matter, that occur in response to thermal, hydrological, and nutrient transformations belowground. Our results demonstrate significant spatial heterogeneity in multi-decadal Arctic carbon cycle trajectories and argue for more mechanistic models to improve predictive capabilities.

scholarly journals Phenological responses of Icelandic subarctic grasslands to short-term and long-term natural soil warming

2017 ◽  
Vol 23 (11) ◽  
pp. 4932-4945 ◽  
Author(s):  
Niki I. W. Leblans ◽  
Bjarni D. Sigurdsson ◽  
Sara Vicca ◽  
Yongshuo Fu ◽  
Josep Penuelas ◽  
...  
Keyword(s):  
Natural Soil ◽  
Soil Warming ◽  
Short Term

Conceptual short-term memory (CSTM) supports core claims of Christiansen and Chater

2016 ◽  
Vol 39 ◽  
Author(s):  
Mary C. Potter
Keyword(s):  
Working Memory ◽  
Rapid Serial Visual Presentation ◽  
Language Comprehension ◽  
Short Term Memory ◽  
Visual Presentation ◽  
Long Term Memory ◽  
Short Term ◽  
Term Memory ◽  
Use Of Knowledge

AbstractRapid serial visual presentation (RSVP) of words or pictured scenes provides evidence for a large-capacity conceptual short-term memory (CSTM) that momentarily provides rich associated material from long-term memory, permitting rapid chunking (Potter 1993; 2009; 2012). In perception of scenes as well as language comprehension, we make use of knowledge that briefly exceeds the supposed limits of working memory.

Ultrastructural investigations of MDL 19,660-induced effects on the canine platelet and megakaryocyte

1990 ◽  
Vol 48 (3) ◽  
pp. 374-375
Author(s):  
D.E. Loudy ◽  
J. Sprinkle-Cavallo ◽  
J.T. Yarrington ◽  
F.Y. Thompson ◽  
J.P. Gibson
Keyword(s):  
Antidepressant Drug ◽  
Beagle Dogs ◽  
Long Term Effects ◽  
Short Term ◽  
Platelet Counts ◽  
Toxicological Studies ◽  
Induced Aggregation ◽  
Internal Architecture

Previous short term toxicological studies of one to two weeks duration have demonstrated that MDL 19,660 (5-(4-chlorophenyl)-2,4-dihydro-2,4-dimethyl-3Hl, 2,4-triazole-3-thione), an antidepressant drug, causes a dose-related thrombocytopenia in dogs. Platelet counts started to decline after two days of dosing with 30 mg/kg/day and continued to decrease to their lowest levels by 5-7 days. The loss in platelets was primarily of the small discoid subpopulation. In vitro studies have also indicated that MDL 19,660: does not spontaneously aggregate canine platelets and has moderate antiaggregating properties by inhibiting ADP-induced aggregation. The objectives of the present investigation of MDL 19,660 were to evaluate ultrastructurally long term effects on platelet internal architecture and changes in subpopulations of platelets and megakaryocytes.Nine male and nine female beagle dogs were divided equally into three groups and were administered orally 0, 15, or 30 mg/kg/day of MDL 19,660 for three months. Compared to a control platelet range of 353,000- 452,000/μl, a doserelated thrombocytopenia reached a maximum severity of an average of 135,000/μl for the 15 mg/kg/day dogs after two weeks and 81,000/μl for the 30 mg/kg/day dogs after one week.

Comparison of Auditory, Language, Memory, and Attention Abilities in Children With and Without Listening Difficulties

2020 ◽  
Vol 29 (4) ◽  
pp. 710-727
Author(s):  
Beula M. Magimairaj ◽  
Naveen K. Nagaraj ◽  
Alexander V. Sergeev ◽  
Natalie J. Benafield
Keyword(s):  
Auditory Processing ◽  
Short Term Memory ◽  
Group Differences ◽  
Long Term Memory ◽  
Short Term ◽  
Significant Group ◽  
Term Memory ◽  
Memory And Attention ◽  
Speed And Accuracy

Objectives School-age children with and without parent-reported listening difficulties (LiD) were compared on auditory processing, language, memory, and attention abilities. The objective was to extend what is known so far in the literature about children with LiD by using multiple measures and selective novel measures across the above areas. Design Twenty-six children who were reported by their parents as having LiD and 26 age-matched typically developing children completed clinical tests of auditory processing and multiple measures of language, attention, and memory. All children had normal-range pure-tone hearing thresholds bilaterally. Group differences were examined. Results In addition to significantly poorer speech-perception-in-noise scores, children with LiD had reduced speed and accuracy of word retrieval from long-term memory, poorer short-term memory, sentence recall, and inferencing ability. Statistically significant group differences were of moderate effect size; however, standard test scores of children with LiD were not clinically poor. No statistically significant group differences were observed in attention, working memory capacity, vocabulary, and nonverbal IQ. Conclusions Mild signal-to-noise ratio loss, as reflected by the group mean of children with LiD, supported the children's functional listening problems. In addition, children's relative weakness in select areas of language performance, short-term memory, and long-term memory lexical retrieval speed and accuracy added to previous research on evidence-based areas that need to be evaluated in children with LiD who almost always have heterogenous profiles. Importantly, the functional difficulties faced by children with LiD in relation to their test results indicated, to some extent, that commonly used assessments may not be adequately capturing the children's listening challenges. Supplemental Material https://doi.org/10.23641/asha.12808607

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