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Related Concept Videos

Operon Model01:23

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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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Operons02:09

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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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Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).
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Repressible Operon: trp Operon01:21

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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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Overcurrent Relays01:26

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Overcurrent relays, crucial for circuit protection, are connected to the secondary current of a current transformer. There are two primary types of overcurrent relays: instantaneous and time-delay.
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Operational Amplifiers01:17

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The operational amplifier, often referred to as an op-amp, is a multifaceted building block of a circuit. This electronic component functions like a voltage-controlled voltage source and can also be used to create a voltage- or current-controlled current source. The design of an operational amplifier enables it to execute mathematical operations when external components like resistors and capacitors are linked to its terminals. An op-amp has the capacity to sum signals, amplify a signal,...
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Updated: Feb 23, 2026

Operation of a 25 KWth Calcium Looping Pilot-plant with High Oxygen Concentrations in the Calciner
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We are operating too much.

Nicola Maffulli1,2

  • 1Department of Musculoskeletal Disorders, University of Salerno School of Medicine, Surgery and Dentistry, Salerno, Italy. n.maffulli@qmul.ac.uk.

Journal of Orthopaedics and Traumatology : Official Journal of the Italian Society of Orthopaedics and Traumatology
|September 8, 2017
PubMed
Summary
This summary is machine-generated.

Orthopaedic and trauma surgeons are performing more operations despite evidence suggesting surgery isn't always superior to conservative care. Surgeons should reconsider surgical interventions for common ailments.

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Area of Science:

  • Orthopaedic Surgery
  • Trauma Surgery
  • Evidence-Based Medicine

Background:

  • Increasing superspecialisation in orthopaedics correlates with a rise in surgical procedures for trauma and orthopaedic conditions.
  • This trend contrasts with findings from high-quality studies (Level I evidence).

Discussion:

  • Level I studies, characterized by rigorous planning, execution, relevant outcomes, and sufficient follow-up, question the established belief in surgical superiority.
  • These studies suggest that conservative management or even supervised neglect may be as effective, or more so, than surgical intervention in many cases.

Key Insights:

  • High-quality research challenges the routine surgical approach in orthopaedics and trauma.
  • The effectiveness of surgical intervention over conservative methods is increasingly being questioned by robust evidence.

Outlook:

  • Orthopaedic and trauma surgeons should critically evaluate the necessity of surgical procedures.
  • A more judicious approach, considering non-operative alternatives, is advocated before proceeding with surgery.