Results 31 to 40 of about 203,784 (224)
The Astrophysical Journal Letters, Volume 868, L12 (2018), 2018 We present an analytic model to estimate the total number of rocky or icy objects that could be captured by planetary systems within the Milky Way galaxy and result in panspermia should they harbor life. We estimate the capture rate of objects ejected from planetary systems over the entire phase space as well as time.
arxiv +1 more source
Soil health and sustainability: managing the biotic component of soil quality
Applied Soil Ecology, 2000 Soil health is the capacity of soil to function as a vital living system, within ecosystem and land-use boundaries, to sustain plant and animal productivity, maintain or enhance water and air quality, and promote plant and animal health. Anthropogenic reductions in soil health, and of individual components of soil quality, are a pressing ecological ...
Doran, John W., Zeiss, Michael R.
openaire +3 more sources
Arcopilus aureus : a valuable endophytic associate of hazelnut
Acta Agrobotanica, 2023 Endophytic fungi are increasingly being considered for their ecological role and effects on plant protection and nutrition. Their contribution in improving fitness can be particularly relevant in the case of semi-extensive tree crops, such as hazelnut ...
Beata Zimowska, Rosario Nicoletti
doaj +1 more source
Self-organized biodiversity in biotic resource systems [PDF]
arXiv, 2023 What determines biodiversity in nature is a prominent issue in ecology, especially in biotic resource systems that are typically devoid of cross-feeding. Here, we show that by incorporating pairwise encounters among consumer individuals within the same species, a multitude of consumer species can self-organize to coexist in a well-mixed system with one
arxiv
ROS generated from biotic stress: Effects on plants and alleviation by endophytic microbes
Frontiers in Plant Science, 2022 Aerobic living is thought to generate reactive oxygen species (ROS), which are an inevitable chemical component. They are produced exclusively in cellular compartments in aerobic metabolism involving significant energy transfer and are regarded as by ...
Pramod Kumar Sahu +10 more
doaj +1 more source
First detection of the pre-biotic molecule glycolonitrile (HOCH2CN) in the interstellar medium [PDF]
, 2019 Theories of a pre-RNA world suggest that glycolonitrile (HOCH$_2$CN) is a key species in the process of ribonucleotide assembly, which is considered as a molecular precursor of nucleic acids. In this Letter, we report the first detection of this pre-biotic molecule in the interstellar medium (ISM) by using ALMA data obtained at frequencies between 86.5$
arxiv +1 more source
A new method for faster and more accurate inference of species associations from big community data [PDF]
Methods in ecology and evolution (2013), 12(11), 2159-2173, 2020 1. Joint Species Distribution models (JSDMs) explain spatial variation in community composition by contributions of the environment, biotic associations, and possibly spatially structured residual covariance. They show great promise as a general analytical framework for community ecology and macroecology, but current JSDMs, even when approximated by ...
arxiv +1 more source
Frontiers in Environmental Science, 2022 Land use modification is a notable cause of biodiversity loss in streams. However, the impacts of anthropogenic forest conversion on β-diversity are difficult to forecast, especially in Afrotropical stream ecosystem, mainly because: 1) empirical research
Unique N. Keke +5 more
doaj +1 more source
Hydro-chemical study of the evolution of interstellar pre-biotic molecules during the collapse of molecular clouds [PDF]
2012RAA....12....3M, 2012 One of the stumbling blocks for studying the evolution of interstellar molecules is the lack of adequate knowledge of the rate co-efficients of various reactions which take place in the Interstellar medium and molecular clouds. Some of the theoretical models of rate coefficients do exist in the literature for computing abundances of the complex pre ...
arxiv +1 more source
Brazilian Journal of Oceanography, 2015 This paper aims to test the suitability of some biotic indices for their application in Southeast Caspian Sea. For this purpose, the ecological quality of the Gomishan lagoon was assessed using three biotic indices (AMBI, BENTIX, BOPA) during summer and ...
Nabee Basatnia +3 more
doaj +1 more source