Top 10 Eartharxiv Papers Today in Life Sciences


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#1. PERCENTAGE OF TOTAL PLANT MONOCOTS AND DICOTS IN SERDANG MENANG VILLAGE, SIRAH PULAU PADANG SUB-DISTRICT, OGAN KOMERING ILIR DISTRICT
Ari Sugiarto
Dicotyledonous plant is a plant that has the characteristic that transporter tissue files are in a loop, while monocot plants are plants that have the characteristic that the tissue transporter beam spread. Morphological differences between plants dicots and monocots can be seen from the roots, stems, leaves and flowers. Dicotyledonous plants rooted riding, rod cambium, pinnate leaves and flower jewelry section consisting of 2, 4, 5 or multiples thereof. Monocot fibrous roots, stems not cambium, leaves curved, parallel, flower jewelry section consists of 3 or multiples thereof. The research was conducted on Sunday, May 15, 2016, in the Serdang Menang village, Sirah Pulau Padang, Ogan Komering Ilir. Tools and materials used are stationery and notepads. Number of dicotyledonous plants located in the village of Serdang Menang totaling 94 species, while the monocot plants totaling 30 species were found. Total comparison 75, 8% (plants dikotil) and 24, 2% (plants monocots).
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Authors: 1
Total Words: 1346
Unqiue Words: 524

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#2. Inventory of Butterflies in Serdang Menang Village, Sirah Pulau Padang Sub-district, Ogan Komering Ilir District
Ari Sugiarto
Serdang Menang Village is one of villages in Sirah Pulau Padang Sub-district, Ogan Komering Ilir District has a variety of ecosystems, ranging from river ecosystems, rice fields, plantations, and settlements which of course also have a diversity of species in it. The diversity of ecosystem types also affects the presence of butterflies. Need to do an inventory of butterflies in Serdang Menang Village, Sirah Pulau Padang Sub-district, Ogan Komering Ilir District to find out what butterfly species are there. This research was carried out in Serdang Menang Village, Sirah Pulau Padang Sub-district, Ogan Komering Ilir District in October 2018. The sampling of butterflies using roaming methods. Sampling is done using insecting net. Butterfly species identification is done by matching samples with photos of butterflies that have been identified. The results showed that there were 10 species of butterflies from 4 familes, namely Carterocephalus palaemon from Family Hesperiidae, Euchrysops cnejus from Lycaenidae Family, Danaus melanippus,...
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Authors: 1
Total Words: 1283
Unqiue Words: 477

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#3. An ecologically based approach to terrestrial primary production
Grayson Badgley, Leander D. L. Anderegg, Joseph A. Berry, Christopher B. Field
Terrestrial gross primary production (GPP) is both the largest and most uncertain flux within the global carbon cycle. Much of this uncertainty results from the fact that GPP is onerous to measure and is only reliably monitored at roughly 100 canopy-scale sites scattered across the globe. Sparsity of consistent GPP observations at the site-level translates into significant uncertainties in our understanding of the magnitude and spatial distribution of GPP at the global scale. We present a new, ecologically based approach for estimating GPP that takes advantage of the tendency for plants to capture only the amount of sunlight they are capable of efficiently using. Our approach uses a new remote sensing product that is sensitive to both the amount of light captured by plants and the efficiency with which plants use light for photosynthesis. The product is highly accurate in reproducing site-based GPP estimates, yet allows for simple calculation using data available globally for more than three decades. By precisely measuring the...
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Repository: nirv-global
User: badgley
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Subscribers: 1
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Authors: 4
Total Words: 9851
Unqiue Words: 3887

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#4. Inferring drivers of changing land surface phenology from Landsat time series
Cornelius Senf, Tobias Krueger
Phenology is an important ecosystem property, and monitoring and modeling of phenology is particularly important for understanding climate change impacts on vegetated ecosystems. However, in-situ measurements are frequently confined to a few specific observation sites and species, and are thus limited for fully understanding the drivers of changing phenology at broader scales. Moderate resolution remote sensing time series from the Landsat archive can help overcome this limitation by delivering a consistent estimate of land surface phenology over the past 30 years. Yet, methods for inferring the drivers of variation in land surface phenology from these data remain scarce. We here present a new model for inferring drivers of changing land surface phenology from Landsat time series. We demonstrate our model using a case study comprising broadleaved and coniferous forests and estimating the effects of pre-season temperature and winter-chilling on inter-annual variation in the start of season. We identified significant effects of...
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Code and data of a manuscript on inferring phenological drivers from landsat time series

Repository: phenoBayes_drivers
User: corneliussenf
Language: R
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Authors: 2
Total Words: 5654
Unqiue Words: 2216

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#5. Marine and freshwater micropearls: Biomineralization producing strontium-rich amorphous calcium carbonate inclusions is widespread in the genus Tetraselmis (Chlorophyta)
Agathe Martignier, Montserrat Filella, Michael Melkonian, Kilian Pollok, Michael Bensimon, François Barja, Falko Langenhorst, Jean-Michel Jaquet, Daniel Ariztegui
The genus Tetraselmis (Chlorophyta) includes more than 30 species of unicellular micro-algae that have been widely studied since the description of the first species in 1878. Tetraselmis cordiformis (presumably the only freshwater species of the genus) was discovered recently to form intracellular mineral inclusions, called micropearls, which had been previously overlooked. These non-skeletal intracellular inclusions of hydrated amorphous calcium carbonates (ACC) were first described in Lake Geneva (Switzerland) and are the result of a novel biomineralization process. The present study shows that many Tetraselmis species share this biomineralization capacity: 10 species out of the 12 tested contained micropearls, including T. chui, T.convolutae, T.levis, T. subcordiformis, T. suecica and T. tetrathele. Our results indicate that micropearls are not randomly distributed inside the Tetraselmis cells, but are located preferentially under the plasma membrane and seem to form a definite pattern, which differs between species. In...
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Authors: 9
Total Words: 9057
Unqiue Words: 3228

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#6. To be or not to be: Prospects for rice self-sufficiency in China
Nanyan Deng, Patricio Grassini, Haishun Yang, Jianliang Huang, Kenneth Cassman, Shaobing Peng
China produces 28% of global rice supply and is currently self-sufficient despite a massive rural to urban demographic transition that drives intense competition for land and water resources. At issue is whether to remain self-sufficient, which depends on the potential to raise yields on existing rice land. Here we report the first high-resolution spatial analysis of rice production potential in China and evaluate scenarios to 2030. We find that China is likely to remain self-sufficient in rice assuming current yield and consumption trajectories and no reduction in production area. Focusing research and development on rice systems and regions with the largest potential to close yield gaps, as identified in this study, provides greatest opportunity to remain self-sufficient, even with reduced rice area.
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Authors: 6
Total Words: 9470
Unqiue Words: 3231

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#7. Radiolysis via radioactivity is not responsible for rapid methane oxidation in subterranean air
Arndt Schimmelmann, Angel Fernandez Cortes, Soledad Cuezva, Thomas Streil, Jay T. Lennon
Atmospheric methane is rapidly lost when it enters humid subterranean critical and vadose zones (e.g., air in soils and caves). Because methane is a source of carbon and energy, it can be consumed by methanotrophic methane-oxidizing bacteria. As an additional subterranean sink, it has been hypothesized that methane is oxidized by natural radioactivity-induced radiolysis that produces energetic ions and radicals, which then trigger abiotic oxidation and consumption of methane within a few hours. Using controlled laboratory experiments, we tested whether radiolysis could rapidly oxidize methane in sealed air with different relative humidities while being exposed to elevated levels of radiation (more than 535 kBq m-3) from radon isotopes 222Rn and 220Rn (i.e., thoron). We found no evidence that radiolysis contributed to methane oxidation. In contrast, we observed the rapid loss of methane when moist soil was added to the same apparatus in the absence of elevated radon abundance. Together, our findings are consistent with the view...
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Authors: 5
Total Words: 8113
Unqiue Words: 3097

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#8. A Sensitivity Analysis Study of the SPITFIRE Fire Model
Jose Gomez-Dans
This MS describes a sensitivity analysis of the SPITFIRE fire model coupled to the Lund-Potsdam-Jena (LPJ) dynamic global vegetation model (DGVM). The study aims to investigate the parameters that control how the fire model calculates burnt area across different ecosystems. In different fire systems, different parameters are found to have higher sensitivity to burnt area, but in general, parameters controlling rate of spread and ignitions.
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Pepucho666: Sensitivity analysis of the LPJ-SPITIRE fire model preprint @EarthArXiv https://t.co/3b8KpsTsK1
EarthArXiv: RT @Pepucho666: Sensitivity analysis of the LPJ-SPITIRE fire model preprint @EarthArXiv https://t.co/3b8KpsTsK1
mdekauwe82: RT @Pepucho666: Sensitivity analysis of the LPJ-SPITIRE fire model preprint @EarthArXiv https://t.co/3b8KpsTsK1
jamesbrennan: RT @Pepucho666: Sensitivity analysis of the LPJ-SPITIRE fire model preprint @EarthArXiv https://t.co/3b8KpsTsK1
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Authors: 1
Total Words: 13282
Unqiue Words: 3753

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#9. TIMS analysis of neodymium isotopes in human tooth enamel using 1013 Ω amplifiers
Esther Plomp, Isabella von Holstein, Janne Koornneef, Richard Smeets, Laura Font, Jacques Baart, Tim Forouzanfar, Gareth Davies
Human provenance studies employing isotope analysis are essential in archaeological and forensic sciences but current applications provide limited spatial resolution. This study reports on the potential of neodymium isotope composition (143Nd/144Nd) to improve human provenancing capabilities. Human tissues contain very low (<0.1 ppm) neodymium concentrations, such that previous composition analysis was not possible. Additionally, Nd composition analysis in human enamel is hindered by Ca in the sample matrix. A modified Nd chromatographic separation technique is reported here, which removes large Ca quantities and accommodates large sample sizes (300-1000 mg). Verification of the modified chromatographic procedure was achieved using an internal synthetic tooth standard. These advancements allow for high precision Nd isotope composition analysis on ~500 mg of tooth enamel, or >100 pg of Nd, by thermal ionization mass spectrometry (TIMS) using 1013 Ω resistors. Neodymium concentrations in enamel from third molars of modern...
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Authors: 8
Total Words: 7486
Unqiue Words: 2757

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#10. Simulated environmental photo- and auto-oxidation of ambrein
Steven John Rowland, Paul Andrew Sutton, Dominic Payne
We conducted experiments in which ambrein in seawater (~1666 mg L-1) containing a photosensitiser, forms of which are found naturally in ambergris (5, 10, 15, 20-tetraphenyl-21H, 23H-porphine copper (II); 1% of ambrein w/w), was exposed to simulated natural sunlight for experimental periods of up to 6 h (approximately equivalent to 48 h natural exposure, Florida midday, mid-summer sunlight). Dark controls were treated in the same manner, without exposure to light. After 6 h exposure to light, total reaction products detectable by gas chromatography-mass spectrometry of solvent extracts, comprised about 1% by mass of the initial ambrein. However, unaccounted-for mass losses of ambrein were much greater than this (~50%), even in the dark, suggesting major losses of volatile products and/or non-recovery of some oxidation products by extraction. Photo-oxidation products included ambroxan, γ-dihydroionone, a tricyclic enol ether and possibly a related lactone. All of these have been reported previously in photoexposures of ambrein...
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Total Words: 5325
Unqiue Words: 1890

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