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Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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Pleural Effusion Overview
A pleural effusion is the abnormal collection of fluid between the parietal and visceral pleura layers of tissue that form the lining of the lungs and chest cavity. It can occur independently or due to surrounding parenchymal diseases, such as infection, malignancy, or inflammatory conditions.
Clinical Manifestations:
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Sputum studies are a critical part of diagnosing and treating numerous respiratory conditions. These studies involve obtaining sputum samples for analysis to identify pathogenic organisms and assess the presence of abnormal cells indicative of malignant conditions. This lesson will delve into three fundamental sputum studies: Gram Stain, Cytology, and Acid-fast Smear and Culture.
Gram Stain
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Schemas01:42

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A schema is a mental construct consisting of a cluster or collection of related concepts (Bartlett, 1932). There are many different types of schemata, and they all have one thing in common: schemata are a method of organizing information that allows the brain to work more efficiently. When a schema is activated, the brain makes immediate assumptions about the person or object being observed.
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Updated: Feb 5, 2026

Impression Cytology of the Lid Wiper Area
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Updates in Effusion Cytology.

Christin M Lepus1, Marina Vivero1

  • 1Department of Pathology, Brigham and Women's Hospital, 75 Francis Street, Boston, MA 02115, USA.

Surgical Pathology Clinics
|September 8, 2018
PubMed
Summary

Recent advances in pleural effusion cytology aid in diagnosing and managing pleural diseases. New techniques like immunohistochemistry and molecular testing improve accuracy for benign and malignant neoplasms.

Area of Science:

  • Cytopathology
  • Oncology
  • Thoracic Medicine

Background:

  • Effusion cytology is crucial for diagnosing benign and malignant diseases.
  • It guides tissue allocation for ancillary studies and biomarker testing.
  • Pleural neoplasms require accurate diagnosis and management strategies.

Purpose of the Study:

  • To summarize recent advances in pleural effusion cytology.
  • To highlight the practical application of diagnostic techniques.
  • To focus on the diagnosis and management of pleural neoplasms.

Main Methods:

  • Review of recent literature on pleural effusion cytology.
  • Focus on immunohistochemical markers.
  • Application of cytogenetic, flow cytometry, and molecular techniques.
Keywords:
CytologyEffusionImmunohistochemistryMesotheliomaMolecular

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Main Results:

  • Enhanced diagnostic capabilities for pleural effusions.
  • Improved accuracy in differentiating primary and secondary pleural neoplasms.
  • Integration of molecular and cytogenetic data in clinical practice.

Conclusions:

  • Recent advances significantly improve the diagnosis and management of pleural diseases.
  • Immunohistochemistry, cytogenetics, flow cytometry, and molecular techniques are vital tools.
  • These advancements support personalized therapeutic strategies for pleural neoplasms.