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piRNA - Piwi-interacting RNAs02:57

piRNA - Piwi-interacting RNAs

PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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[Research progress on piosphere].

Hong Yu1, Bo Wu

  • 1Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China. jgsyuhong@sohu.com

Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|May 14, 2010
PubMed
Summary
This summary is machine-generated.

Livestock grazing creates a piosphere, a degraded grassland zone around water points. Understanding these zones helps manage arid and semiarid grazing lands sustainably.

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Area of Science:

  • Ecology
  • Environmental Science
  • Rangeland Management

Context:

  • Livestock congregates near water sources in arid and semiarid grasslands.
  • Intensive grazing and trampling lead to radial ecosystem degradation around water points, forming a piosphere.
  • The piosphere exhibits concentric zones: 'sacrificial' core, transitional, and peripheral, with vegetation and soil changes along this gradient.

Purpose:

  • To provide a comprehensive overview of the piosphere concept, research approaches, and progress.
  • To highlight the piosphere's utility in studying grazing impacts on vegetation and soil.
  • To inform effective management and sustainable resource utilization in degrading grassland areas.

Summary:

  • The piosphere concept describes radial grassland degradation around water points due to livestock grazing.
  • It is divided into three zones (core, transitional, peripheral) with distinct ecological responses.
  • This gradient provides a model for understanding grazing impacts and developing conservation strategies.

Impact:

  • Facilitates research on grazing impact patterns and soil-vegetation dynamics.
  • Informs sustainable natural resource management in degraded arid and semiarid regions.
  • Supports the conservation and efficient utilization of grassland ecosystems.