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138 results for “resorption”
Hubbard Brook Nitrogen Oligotrophication (HBNO): Foliar resorption, leaf mass per area, and leaf chemistry of sugar maple and American beech, 2020-2022
We quantified nitrogen (N) resorption of the two dominant tree species of northern hardwood forests along an elevation gradient using 14 sites at Hubbard Brook Experimental Forest, NH. For these calculations, we also quantified the leaf mass per area for both species, sugar maple and American beech. The original data before averaging for combining with chemistry data is available in an earlier revision of this dataset. Foliar N of sugar maple increased, and N resorption proficiency (NRP) decreased with increasing elevation. In contrast, foliar N and NRP of American beech did not vary significantly with elevation, suggesting that the mechanisms driving patterns of N resorption were distinct between these co-occurring species. While both species exhibited strong correlations between resorption efficiency of C and N, resorption of both elements was much greater for beech than maple. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Orthodontically Induced External Apical Root Resorption with genetic and non-genetic factors
<p>Orthodontically Induced External Apical Root Resorption (OIEARR) dataset with genetic and non-genetic factors from a sample of 195 patients previously submitted to orthodontic treatment. Methodology for patient selection is described in published related works as well as materials and methods. Percentage of OIEARR were assessed in maxillary teeth: the four incisors and the two canines. Ten clinical and treatment variables were recorded: gender, age, treatment duration, premolar extractions, skeletal pattern, Hyrax appliance, functional appliance, overjet, anterior open bite and tongue thrust. Single nucleotide polymorphisms (SNPs) of six genes : rs114363 from <em>IL1B</em>; rs3102735 from <em>TNFRSF11B</em>, encoding OPG; rs1059703 from <em>I</em><em>RAK1</em>; rs315952 from <em>IL1RN</em>; rs1805034 from <em>TNFRSF11A</em>, encoding RANK; rs1718119 from <em>P2RX7</em>.</p>
Macroscale Variation in Red Maple (Acer rubrum) Foliar Carbon, Nitrogen, and Nitrogen Resorption
Project Description The primary goal of this project was to investigate intraspecific variation of foliar nitrogen resorption for Acer rubrum (red maple). In particular, we are interested in examining whether foliar nutrient resorption is related to climatic factors such as mean annual temperature and/or precipitation. The approach used to collect green and fallen leaf samples was through a community science project where participants sent leaves to our lab at Boston University for analysis. In the spring/summer of 2019 plant and naturalist organizations throughout the range of red maple in the United States were contacted to request information about this project be sent to their members regarding the collection of red maple leaves for the study. Interested parties were prompted to complete a google form that included basic contact information. Each participant was then sent a sampling kit which included gloves, sampling protocols, and data sheets. For each set of leaves collected from a single tree they were assigned the following identification “tasper-###” where the numbers were uniquely assigned. Green and fallen leaves were assigned different “tasper-###” numbers. Within a single identification (e.g., tasper-120) each leaf was individually assigned a letter a-n, where n corresponds to the letter of how many leaves were sent from that tree. For most samples a-j was obtained because we asked participants to collect 10 leaves. Individual leaves were scanned for area analysis using a flatbed scanner at 300 dpi and weighed. For C&N analysis each leaf blade from a set of green or fallen leaves from a single tree was hole-punched and the samples were combined yielding one C and N concentration per tree for both each green and fallen leaves. Punches were ground and homogenized to a powder using a mortar and pestle. Approximately 3 mg of dried sample was analyzed for C and N concentration using a NC2500 elemental analyzer (CE Elantech, Lakewood, NJ, USA). NIST Apple Le
Figure 2. Green and senescence N in Foliar resorption of nitrogen and phosphorus in Alcea apterocarpa (Malvaceae) in different habitats types
Figure 2. Green and senescence N:P ratio of A. apterocarpa in different habitat types. Means followed by the same letter are not significantly different at the 0.05 level using Tukey's HSD test.
Figure 1 in Foliar resorption of nitrogen and phosphorus in Alcea apterocarpa (Malvaceae) in different habitats types
Figure 1. Resorption proficiency and efficiency levels of A. apterocarpa according to all patterns. Habitat abbreviations are H1: riverbank, H2: meadow and H3: forest clearing. Minor letters followed by the same letter are not significantly different at the 0.05 level using Tukey's HSD test.
Nitrogen resorption dynamics and slow-fast strategies in 137 Arabidopsis thaliana genotypes
<p>Leaf nitrogen resorption efficiency (R_efficiency, %) and the relative maximum resorption rate of nitrogen (R_rate_max_perN, mg d<sup>-1</sup> mg<sup>-1</sup>) were estimated together with the flowering time (FT, days after germination) and specific leaf area (SLA, m<sup>2</sup> kg<sup>-1</sup>) in 137 Arabidopsis thaliana accessions selected from the 1001 genomes project accession list. The dataset contains genotype means for every measured accession.</p>
Sclerostin blockade inhibits bone resorption through PDGF receptor signaling in osteoblast lineage cells
<p>While sclerostin-neutralizing antibodies (Scl-Ab) transiently stimulate bone formation by activating Wnt signaling in osteoblast lineage cells, they exert sustained inhibition of bone resorption, suggesting an alternate signaling pathway by which Scl-Ab control osteoclast activity. Since sclerostin can activate platelet-derived growth factor receptors (PDGFRs) in osteoblast lineage cells in vitro and PDGFR signaling in these cells induces bone resorption through M-CSF secretion, we hypothesized that the prolonged anti-catabolic effect of Scl-Ab could result from PDGFR inhibition. We show here that inhibition of PDGFR signaling in osteoblast lineage cells is sufficient and necessary to mediate prolonged Scl-Ab effect on M-CSF secretion and osteoclast activity in mice. Indeed, sclerostin co-activates PDGFRs independently of Wnt/β-catenin signaling inhibition, by forming a ternary complex with LRP6 and PDGFRs in pre-osteoblasts. In turn, Scl-Ab prevents sclerostin-mediated co-activation of PDGFR signaling and consequent M-CSF up-regulation in pre-osteoblast cultures, thereby inhibiting osteoclast activity in pre-osteoblast/osteoclast co-culture assays. These results provide a new potential mechanism explaining the dissociation between anabolic and anti-resorptive effects of long-term Scl-Ab.</p>
Figure 2 in Resorption of scales in Atlantic salmon (Salmo salar) during its anadromous migration: a quantitative study
Figure 2. - Variations of salmon scale ratios according to sex, sea age (grilse or spring salmon) and migration stage (ascending or spawning). A: RE1 ratio (total scale surface / fork length squared). B: RE2 ratio (anterior field surface / total scale surface). C: RE3 ratio (small radius / long radius of scale). SE = standard error.
Figure 5. - Scanning electron microscopy. A in Resorption of scales in Atlantic salmon (Salmo salar) during its anadromous migration: a quantitative study
Figure 5. - Scanning electron microscopy. A: View of a spawning male scale (F = focus); B: Detail of the anterior field of the same scale showing some Howship's lacunae (arrows), which are evidence for osteoclastic resorption.
Figure 1 in Resorption of scales in Atlantic salmon (Salmo salar) during its anadromous migration: a quantitative study
Figure 1. - Measurements taken on salmon scales. A: Scale of ascending spring salmon; B: Scale of spawning spring salmon. F: Focus; LR: long radius; SA: surface of the anterior field of the scale; SP: surface of the posterior field of the scale; SR: small radius.
Data from: Leaf functional traits predict timing of nutrient resorption and carbon depletion in deciduous subarctic plants
Open the record for dataset details and reuse information.
Nitrogen and Phosphorus resorption of thin-leaf alder growing in control, N-fertilized, and P-fertilized plots across a floodplain successional gradient.
This file includes data for leaf N and P concentrations, specific leaf weight, and N and P resorption for thin-leaf alder during the 2009 growing in control, N-fertilized, and P-fertilized stands in early-, mid- and late-successional stages along the Tanana River.
Ectomycorrhizal trees rely on nitrogen resorption less than arbuscular mycorrhizal trees globally
<p>Nitrogen (N) resorption is an important pathway of N conservation, contributing to a proportion of plant N requirement. However, whether the ratio of N resorption to N requirement would be affected by environmental factors, mycorrhizal types or atmospheric CO2 concentration remains unclear. Here, we conducted a meta-analysis on the impacts of environmental factors and mycorrhizal types on this ratio. We found this ratio in ectomycorrhizal (EM) trees decreased with mean annual precipitation (MAP), mean annual temperature (MAT), soil total N content (TN) and atmospheric CO2 concentration and was significantly lower than that in arbuscular mycorrhizal (AM) trees. An <i>in situ</i> 15N tracing experiment further confirmed this stronger reliance on N resorption for AM trees than EM trees. Our study suggests that AM and EM trees potentially have different strategies for alleviation of progressive N limitation, highlighting the necessity of incorporating plant mycorrhizal types into Earth System Models. </p>
Figure 4. Regression between senescence leaf N in Foliar resorption of nitrogen and phosphorus in Alcea apterocarpa (Malvaceae) in different habitats types
Figure 4. Regression between senescence leaf N/P ratio and RE and RP of A. apterocarpa.
Figure 3. Regression between green leaf N in Foliar resorption of nitrogen and phosphorus in Alcea apterocarpa (Malvaceae) in different habitats types
Figure 3. Regression between green leaf N/P ratio and RE and RP of A. apterocarpa.
Leaf enzyme plays a more important role in leaf nitrogen resorption efficiency than soil properties along an elevation gradient
<p>1. Nitrogen (N) resorption is a strategy for plant N conservation through which plants withdraw N from senescing leaves prior to litterfall and its underlying mechanisms are important for better understanding of N cycling. However, most current studies focused on the impacts of soil and leaf nutrients on leaf N resorption efficiency (NRE), and plant physiological regulation that is species-dependent is still unclear.</p> <p>2. Here, we conducted a field experiment to investigate the variations of leaf NRE along an altitudinal gradient in a temperate forest of Northeastern China.</p> <p>3. Results showed that leaf NRE of Q. mongolica and F. mandshurica increased with altitude, while leaf NRE of T. amurensis, A. mono and A. pseudosieboldianum exhibited an opposite trend, although the relationships were not significant for F. mandshurica and A. mono. The inconsistent responses of leaf NRE of different species to increasing altitude were primarily due to the effect of leaf Glutamate dehydrogenase (GDH), an enzyme responsible for N translocation. Leaf GDH activity in senescing leaves explained the variation of NRE more than soil and climate factors did, suggesting that different plant species had different physiological regulation strategies for their N conservation under similar environment.</p> <p>4. Synthesis. Our study highlights the role of leaf enzyme as a pivotal regulator of leaf NRE and helps us better understand and predict N cycling under climate change in forest ecosystems.</p>
Phenotypic plasticity contributes more to the variations in nutrient resorption than genetic differentiation in a grassland dominant
<p class="MsoNormal"><span>1. P</span><span>henotypic plasticity and genetic differentiation are the two important processes determining the leaf nutrient resorption among and within plant species, which is critical for understanding the adaptability of plants</span><span>.</span><span> However, relative contributions of <span>these two processes</span> have never been quantified at a large geographical scale. </span></p> <p class="MsoNormal"><span>2. Here, we investigated intraspecific variations in nutrient resorption among 14 <em>Stipa breviflora</em> populations along a latitude gradient in 2018 and 2019. Furthermore, we sow seeds from these populations in two common gardens at different latitudes, and</span><span> </span><span>examined the variations in nutrient resorption. </span></p> <p class="MsoNormal"><span>3. Our results showed that nitrogen and phosphorus resorption efficiency (NRE and PRE)<span> among </span><em>S. breviflora </em>populations<span> </span><span>in nature were positively related to latitude, while this trend disappeared in the common gardens. </span>The heritability of <span>NRE and PRE was 11.45 % and 16.78 %, respectively. These results suggested that</span> phenotypic plasticity contributed much more than genetic variation to nutrient resorption of <em>S. breviflora</em>.<span> </span>Moreover, <span>the structural equation modeling (SEM) suggested that latitude indirectly affected </span>nutrient resorption mainly by altering soil nutrients. With the increasing of latitude, soil nutrients decreased while nutrient resorption increased<span>. This suggested</span> <a name="_Hlk78556987"></a><span>the main process regulating nutrient resorption is negative feedback to soil nutrient availability. </span></span></p> <p class="MsoNormal"><span>4. </span><span>Our study provides new insights into the role of nutrient resorption in plant adaptations to geographic variations.</span></p>
THREE-DIMENSIONAL VOLUMETRIC EVALUATION OF ROOT RESORPTION IN MAXILLARY ANTERIORS FOLLOWING EN-MASSE RETRACTION WITH VARYING FORCE VECTORS - A RANDOMIZED CONTROL TRIAL
<p>To assess the severity of root resorption (RR) during retraction of maxillary anteriors with and without skeletal anchorage (three different force systems); and analyze it comprehensively using cone-beam computed tomography (CBCT) superimpositions.</p>
Evaluation of orthodontically induced external root resorption following orthodontic treatment using Cone Beam Computed Tomography (CBCT): a systematic review and meta-analysis
<p>Datasets for all analyses performed in the paper.</p>
Data for: Synergistic mechanisms of plant phosphorus (P) resorption and microbial P-limitation affecting soil P during grassland vegetation succession
<p>Data for: <strong>Synergistic mechanisms of plant phosphorus (P) resorption and microbial P-limitation affecting soil P during grassland vegetation succession</strong></p>
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