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Related Concept Videos

PD Controller: Design01:26

PD Controller: Design

638
In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
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Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

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Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
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Increased Body Temperature01:25

Increased Body Temperature

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A body temperature above  38°C  (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in...
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Increased pulse rate01:17

Increased pulse rate

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Tachycardia is a condition marked by an abnormally fast or irregular heart rate, surpassing the typical resting rate. In adults, tachycardia is characterized by a pulse rate ranging from 100 to 180 beats per minute. The increased heart rate can result in inadequate blood flow to various body parts, ultimately diminishing the oxygen supply to organs and tissues.
Many factors can elevate the risk of developing tachycardia. These include advanced age, a family history of arrhythmias, and an...
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Molecules and Compounds02:38

Molecules and Compounds

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Atoms and Molecules
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Frequency-Domain Interpretation of PD Control01:24

Frequency-Domain Interpretation of PD Control

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Proportional-Derivative (PD) controllers are widely used in fan control systems to improve stability and performance. A fan control system can be effectively represented using a Bode plot to illustrate the impact of a PD controller through its transfer function. The Bode plot visually conveys how PD control modifies the fan's response across various frequencies, providing a frequency domain interpretation of the controller's behavior.
The proportional control gain, combined with the...
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Related Experiment Video

Updated: Jan 27, 2026

Sequential Extraction of Soluble and Insoluble Alpha-Synuclein from Parkinsonian Brains
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Plasma alpha-synuclein detected by single molecule array is increased in PD.

Adeline S L Ng1, Yi Jayne Tan1, Zhonghao Lu1

  • 1Department of Neurology National Neuroscience Institute Tan Tock Seng Hospital 11 Jalan Tan Tock Seng Singapore 308433 Singapore.

Annals of Clinical and Translational Neurology
|March 27, 2019
PubMed
Summary

Ultrasensitive measurement of plasma alpha-synuclein (a key Parkinson's disease protein) can distinguish Parkinson's disease (PD) patients from controls and indicates cognitive decline in PD.

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Area of Science:

  • Neuroscience
  • Biomarker Discovery
  • Clinical Diagnostics

Background:

  • Alpha-synuclein is a protein implicated in Parkinson's disease (PD) pathogenesis.
  • Accurate and sensitive detection of alpha-synuclein in biological fluids is crucial for PD diagnosis and monitoring.

Purpose of the Study:

  • To evaluate the utility of ultrasensitive single molecule technology for measuring plasma alpha-synuclein levels.
  • To determine if plasma alpha-synuclein levels can differentiate PD patients from healthy controls.
  • To investigate the correlation between plasma alpha-synuclein levels and clinical parameters in PD.

Main Methods:

  • Plasma samples were collected from 221 subjects (170 PD patients, 51 controls).
  • Ultrasensitive single molecule technology was employed to quantify plasma alpha-synuclein concentrations.
  • Statistical analyses were performed to compare levels between groups and correlate with clinical data (H&Y stage, UPDRS motor scores, MMSE).

Main Results:

  • Plasma alpha-synuclein levels were significantly elevated in PD patients compared to controls (P=0.037).
  • Higher alpha-synuclein levels were observed in PD patients with poorer cognitive function (MMSE ≤ 25) compared to controls (Bonferroni corrected P=0.047).
  • No significant correlation was found between alpha-synuclein levels and H&Y stage or UPDRS motor scores in PD patients.

Conclusions:

  • Ultrasensitive measurement of plasma alpha-synuclein effectively discriminates PD from controls.
  • Plasma alpha-synuclein levels correlate with cognitive severity in Parkinson's disease.
  • These findings suggest potential utility of this assay as a biomarker, warranting further validation.