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Electrical current is defined as the rate at which charge flows. When there is a large current present, such as that used to run a refrigerator, a large amount of charge moves through the wire in a small amount of time. If the current is small, such as that used to operate a handheld calculator, a small amount of charge moves through the circuit over a long period of time. The SI unit for current is the ampere (A), named for the French physicist André-Marie Ampère (1775–1836).
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The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...
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Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
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In parallel electrical connections, resistors are linked between the same pair of nodes, creating an equal voltage across each resistor. Kirchhoff's current law is applied to these connections, establishing that the sum of currents through these resistors equals the source current. Utilizing Ohm's law, the source current is determined as the product of the source voltage and the sum of the reciprocals of individual resistances. This relationship simplifies the process of finding the current...
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Inducing Polyp Bail-out in Coral Colonies to Obtain Individualized Micropropagates for Laboratory Experimental Use
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Current strategies for malignant pedunculated colorectal polyps.

Adriana Ciocalteu1, Dan Ionut Gheonea2, Adrian Saftoiu2

  • 1Department of Gastroenterology, Research Center of Gastroenterology and Hepatology, University of Medicine and Pharmacy of Craiova, Craiova 200349, Romania. adriana_ciocalteu@yahoo.com.

World Journal of Gastrointestinal Oncology
|January 1, 2019
PubMed
Summary

Diagnosing malignant pedunculated colorectal polyps is challenging, despite advances in imaging. This review critically examines recent literature on their diagnosis and management to improve early detection and patient outcomes.

Keywords:
Advanced adenomaColorectal cancerColorectal surgeryDepth of invasionEarly colorectal cancerEarly colorectal carcinomaMalignant colorectal polypPedunculated colorectal polypsPolypectomyPolypoid early colon cancer

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Area of Science:

  • Gastroenterology
  • Oncology
  • Surgical Pathology

Background:

  • Colorectal cancer incidence is rising, with many cases detected at advanced stages.
  • Early detection and accurate staging are crucial for effective treatment and improved outcomes.
  • Diagnosing early-stage malignant pedunculated colorectal polyps remains a significant clinical challenge.

Purpose of the Study:

  • To critically review recent literature on the diagnosis and management of malignant pedunculated colorectal polyps.
  • To highlight the distinct features and challenges associated with these lesions compared to non-pedunculated variants.
  • To provide insights into optimal diagnostic and therapeutic strategies for pedunculated colorectal polyps with malignant potential.

Main Methods:

  • Comprehensive literature search of recent studies on colorectal polyp malignancy.
  • Critical analysis of diagnostic criteria and imaging features.
  • Review of surgical and endoscopic resection techniques and outcomes.
  • Synthesis of data focusing on pedunculated versus non-pedunculated lesions.

Main Results:

  • Limited data exists specifically on the management of pedunculated cancer precursors.
  • Accurate differentiation between benign and malignant pedunculated polyps requires careful evaluation.
  • Complete resection techniques are essential for curative intent and favorable long-term prognosis.

Conclusions:

  • Early and accurate diagnosis of malignant pedunculated colorectal polyps is critical.
  • Further research is needed to refine diagnostic tools and management strategies for these specific lesions.
  • Improved understanding will enhance treatment efficacy and patient survival rates.