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Related Concept Videos

Ecological Disturbance02:26

Ecological Disturbance

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An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.
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All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.
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Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
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Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...
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Megx.net: integrated database resource for marine ecological genomics.

Renzo Kottmann1, Ivalyo Kostadinov, Melissa Beth Duhaime

  • 1Microbial Genomics Group, Max Planck Institute for Marine Microbiology, D-28359 Bremen, Germany. rkottman@mpi-bremen

Nucleic Acids Research
|October 28, 2009
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Summary
This summary is machine-generated.

Megx.net offers an integrated database for microbial ecological genomics, providing access to georeferenced marker genes and environmental data. This updated portal enhances data analysis for microbial ecologists with new features and tools.

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Area of Science:

  • Microbial Ecology
  • Genomics
  • Bioinformatics

Background:

  • Microbial ecological genomics requires integrated access to diverse datasets.
  • Existing resources often lack comprehensive georeferenced and environmental data.

Purpose of the Study:

  • To present the updated megx.net portal, a comprehensive database for microbial ecological genomics.
  • To enhance data accessibility and analysis tools for researchers.

Main Methods:

  • Integrated database (MegDB) storing sequence and habitat data.
  • Global environmental data layers and georeferenced marker genes.
  • Interactive visualization tools (Genes Mapserver) and Web Services.

Main Results:

  • Access to hundreds of prokaryotic and phage genomes and metagenomes.
  • Over a million ribosomal RNA sequences.
  • Interactive world map visualization of data and environmental parameter calculations.

Conclusions:

  • The updated megx.net portal significantly enhances microbial ecological genomics research.
  • Freely accessible data and advanced tools facilitate new discoveries.