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Related Concept Videos

Basic Operations on Signals01:22

Basic Operations on Signals

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Basic signal operations include time reversal, time scaling, time shifting, and amplitude transformations. These operations are fundamental in signal processing and analysis.
Time Reversal mirrors a continuous-time signal about the vertical axis at t=0. This is achieved by substituting t with −t. For example, if a signal x(t) is considered, the time-reversed signal is x(−t). This operation can be graphically represented, showing the mirrored signal.
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Operant Conditioning Intervention01:24

Operant Conditioning Intervention

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Operant conditioning serves as a foundational principle in therapeutic interventions aimed at modifying maladaptive behaviors. Central to this approach is the notion that behaviors, both adaptive and maladaptive, are learned through reinforcement. By analyzing the environmental factors that reinforce problematic behaviors, clinicians can design interventions to weaken these reinforcements and replace maladaptive behaviors with healthier alternatives.
In operant conditioning, behaviors that are...
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Operons02:09

Operons

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Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by...
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Operant Conditioning01:21

Operant Conditioning

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Operant conditioning, a key concept in behavioral psychology, involves using reinforcement and punishment to alter the likelihood of a behavior being repeated. B.F. introduced this type of conditioning. Skinner focused on voluntary behaviors and the consequences that follow them, influencing whether these behaviors will be strengthened or diminished.
Reinforcement in operant conditioning can be positive or negative, both of which serve to increase the likelihood of a behavior. Positive...
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Operon Model01:23

Operon Model

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The operon model represents a fundamental mechanism of gene regulation in prokaryotes, enabling coordinated expression of genes involved in related metabolic or functional pathways. Operons consist of structural genes, a promoter, and an operator, with transcription regulated by repressors, activators, and small effector molecules.Structure and Function of OperonsAn operon is a cluster of structural genes transcribed together under the control of a single promoter. The promoter region...
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Repressible Operon: trp Operon01:21

Repressible Operon: trp Operon

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The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...
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Related Experiment Video

Updated: Dec 9, 2025

Rodent Brain Microinjection to Study Molecular Substrates of Motivated Behavior
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[Operate, cancel, postpone or select?]

J Klocker1, A Frech1, A Gratl1

  • 1Universitätsklinik für Gefäßchirurgie, Medizinische Universität Innsbruck, Anichstraße 35, 6020 Innsbruck, Österreich.

Gefasschirurgie : Zeitschrift Fur Vaskulare Und Endovaskulare Chirurgie : Organ Der Deutschen Und Der Osterreichischen Gesellschaft Fur Gefasschirurgie Unter Mitarbeit Der Schweizerischen Gesellschaft Fur Gefasschirurgie
|September 9, 2020
PubMed
Summary
This summary is machine-generated.

During the COVID-19 pandemic, Austrian vascular surgery centers halted or limited elective procedures. Emergency surgeries continued, but strategies for other cases varied, impacting patient care and potentially causing psychological distress.

Keywords:
Severe acute respiratory syndrome coronavirus 2Surgery cancellationSurgery triageSurveyVascular surgical procedures

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Area of Science:

  • Vascular Surgery
  • Epidemiology
  • Public Health

Context:

  • The COVID-19 pandemic significantly disrupted healthcare systems globally.
  • Austrian vascular surgery centers faced unprecedented challenges in patient management and surgical scheduling.

Purpose:

  • To survey Austrian vascular surgery centers regarding their response to the COVID-19 pandemic.
  • To understand the implications of pandemic-related measures on elective and emergency vascular procedures.

Summary:

  • A nationwide survey of 12 Austrian vascular surgery centers revealed that all encountered COVID-19 positive patients or staff.
  • Elective vascular procedures were universally stopped or limited, while emergency surgeries were maintained.
  • Management strategies for non-emergency cases like chronic ulcers and aneurysms were heterogeneous across centers.

Impact:

  • The pandemic led to heterogeneous management strategies and difficulties in assessing risks associated with delayed treatments.
  • Disruptions in vascular surgery care may have long-term health consequences and psychological effects on patients.
  • Further single and multicenter studies are needed to address non-uniform management strategies and their outcomes.