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Related Concept Videos

Structure of Benzene: Kekulé Model01:07

Structure of Benzene: Kekulé Model

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In 1865, August Kekule suggested the structure of benzene according to the structural theory of organic chemistry based on the three assertions—formula of benzene is C6H6, all the hydrogens of benzene are equivalent, and each carbon must have four bonds due to its tetravalency.
He proposed that benzene has a cyclic structure of six carbon atoms attached to one hydrogen atom each, with three alternating pi bonds.
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Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

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According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
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Methods of Documentation V: CBE01:23

Methods of Documentation V: CBE

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Charting by Exception, or CBE, is a method of documentation used in healthcare, particularly in nursing, that focuses on documenting only significant or abnormal findings rather than recording every detail. This approach aims to streamline the documentation process, improve efficiency, and ensure that healthcare providers can quickly identify deviations from normalcy in patient assessments.
In CBE, healthcare professionals establish predefined standards of practice that define what constitutes...
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Bipolar Junction Transistor01:22

Bipolar Junction Transistor

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Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational...
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Configurations of BJT01:16

Configurations of BJT

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Bipolar Junction Transistors (BJTs) are categorized into various types based on their configurations, each with distinct characteristics and applications. The configurations are primarily differentiated by which terminal—base, emitter, or collector—is common to both the input and output circuits.
The common base configuration is noted for its high voltage gain, positioning it as an ideal choice for single-stage amplifier circuits, such as microphone pre-amplifiers. A notable...
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Characteristics of BJT01:17

Characteristics of BJT

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The Bipolar Junction Transistor (BJT), specifically in a common-emitter configuration, exhibits distinct current-voltage characteristics crucial for understanding its behavior in electronic circuits. These characteristics are established through experimental measurements of voltage and current relationships.
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Related Experiment Video

Updated: May 4, 2026

Immunohistochemical Staining of B7-H1 PD-L1 on Paraffin-embedded Slides of Pancreatic Adenocarcinoma Tissue
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Immunohistochemical Staining of B7-H1 PD-L1 on Paraffin-embedded Slides of Pancreatic Adenocarcinoma Tissue

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To be or not to be B7.

Xingxing Zang1, James P Allison

  • 1Immunology Program, Howard Hughes Medical Institute, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.

The Journal of Clinical Investigation
|October 4, 2006
PubMed
Summary

Vogt et al. reveal that VSIG4 (V-set and Ig domain-containing 4) inhibits T cell activation. This molecule also functions as CRIg, a receptor for complement fragments, adding complexity to T cell costimulation.

Area of Science:

  • Immunology
  • Molecular Biology
  • Complement System

Background:

  • Adaptive immune responses rely on T cell receptor (TCR) engagement and costimulatory signals.
  • The B7 family plays a crucial role in regulating T cell activation.
  • Understanding novel regulators of T cell costimulation is vital for immunology.

Purpose of the Study:

  • To investigate the role of V-set and Ig domain-containing 4 (VSIG4) in T cell activation.
  • To explore the dual functions of VSIG4, including its recently identified role as complement receptor 1g (CRIg).

Main Methods:

  • The study by Vogt et al. identifies VSIG4 as a T cell activation inhibitor.
  • Independent research established VSIG4 as CRIg, a receptor for complement component 3 fragments.

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Main Results:

  • VSIG4 functions as an inhibitor of T cell activation.
  • VSIG4 is also identified as CRIg, binding complement component 3 fragments.
  • The molecule exhibits dual functions, impacting both T cell costimulation and complement recognition.

Conclusions:

  • VSIG4 possesses dual roles as a T cell costimulatory regulator and a complement receptor.
  • These findings introduce new complexity to the understanding of T cell activation and immune responses.
  • Further research is warranted to elucidate the physiological implications of VSIG4's dual functions.