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Related Concept Videos

Pulse01:16

Pulse

2.2K
When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical...
2.2K
Pulse01:05

Pulse

4.1K
The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls...
4.1K
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

1.8K
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
1.8K
Pulse Oximetry01:24

Pulse Oximetry

1.4K
Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
1.4K
Regulation of Pulse01:20

Regulation of Pulse

2.3K
Pulse regulation involves physiological mechanisms that ensure adequate blood flow throughout the body. The heartbeat, regulated by the autonomic nervous system, is influenced by hormonal balance, physical activity, and emotional state.
2.3K
Pulse rhythm01:30

Pulse rhythm

1.4K
Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
1.4K

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Related Experiment Video

Updated: Feb 5, 2026

High-Throughput Analysis of Non-Photochemical Quenching in Crops Using Pulse Amplitude Modulated Chlorophyll Fluorometry
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High-Throughput Analysis of Non-Photochemical Quenching in Crops Using Pulse Amplitude Modulated Chlorophyll Fluorometry

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Intensified Pulse Rotations Buildup Pea Rhizosphere Pathogens in Cereal and Pulse Based Cropping Systems.

Yining Niu1,2, Luke D Bainard1, William E May3

  • 1Swift Current Research and Development Centre, Agriculture and Agri-Food Canada, Swift Current, SK, Canada.

Frontiers in Microbiology
|September 8, 2018
PubMed
Summary

Increasing pulse frequency in crop rotations significantly alters soil fungal communities, favoring pathogens and reducing diversity. Diversified rotations enhance pea yield and minimize disease risk by managing rhizosphere fungi.

Keywords:
Olpidium virulentuscropping systemfield peahigh throughput sequencingpathotrophsrhizosphere fungal diversitysoil physicochemical properties

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Area of Science:

  • Agricultural Science
  • Soil Microbiology
  • Plant Pathology

Background:

  • Rhizosphere microbial communities are vital for crop production, with host plants shaping their composition.
  • Pulse crops are key to sustainable cropping systems, and their frequency is increasing in Canadian prairie rotations.
  • Understanding fungal community shifts in response to pulse frequency is crucial for optimizing crop production and soil health.

Purpose of the Study:

  • To determine how the frequency of pulses in crop rotation influences the fungal community in pea (Pisum sativum L.) rhizosphere.
  • To investigate the impact of different cropping systems on fungal community composition, evenness, and functional groups (pathotrophs).
  • To assess the relationship between cropping systems, soil physicochemical properties (especially pH), and fungal community structure.

Main Methods:

  • Six different 4-year crop rotation systems involving pea (P), lentil (L), canola (C), wheat (W), and oat (O) were established.
  • High-throughput sequencing was used to analyze the fungal communities in the pea rhizosphere at the flowering stage.
  • Soil physicochemical properties were measured, and their influence on fungal community shifts was statistically analyzed.

Main Results:

  • Cropping system significantly impacted rhizosphere fungal community composition, with rotation sequence having a greater effect than previous crops.
  • Intensified pulse rotations (e.g., WPLP) decreased fungal evenness and increased pathotroph abundance, notably Fusarium species.
  • Diversified rotations, including wheat, canola/lentil, and oat, resulted in higher pea grain yields compared to rotations with repeated crops.

Conclusions:

  • Increasing pulse frequency in rotations can lead to an increase in soil-borne pathogens and a decrease in fungal diversity.
  • Soil pH was identified as a primary driver of fungal community shifts in response to cropping systems.
  • Diversifying crop rotations is a viable strategy for managing rhizosphere fungal communities, minimizing disease risk, and improving crop productivity.