Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

The Tree of Life - Bacteria, Archaea, Eukaryotes

The Tree of Life - Bacteria, Archaea, Eukaryotes

The “tree of life” describes the evolution of life and the evolutionary relationships between organisms. The root of the tree is the common ancestor to all life on Earth. All other species radiate from this point, much like the branches of a tree. The numerous tips of these branches on the tree of life represent every living, or extant, species. Extinct species, which are species that no longer exist, can be found towards the center of the tree. Currently, these organisms, both...

ABC Transporters: Exporter

ABC Transporters: Exporter

ATP-binding cassette or ABC transporter is the largest superfamily of integral membrane proteins. The transporters have transmembrane-binding domains (TMDs) and nucleotide-binding domains (NBDs). The TMDs are specific to their substrates, whereas the NBDs are similar to engines that complete ATP hydrolysis to complete the substrate transport. They can be full transporters consisting of two TMDs and NBDs, half transporters with one TMD and NBD, while some encoded with a single TMD or NBD are...

ABC Transporters: Importer

ABC Transporters: Importer

ATP-binding cassette or ABC transporters are a class of ATP-driven pumps that hydrolyze ATP to move solutes across the membrane. They can be grouped into importers and exporters. While exporters are present in all domains of life, importers exist only in bacteria and some plants.
In bacteria, based on the number of transmembrane helices and the chemical nature of their substrates, the ABC importers can be divided into three types:

Survival Tree

Survival Tree

Survival trees are a non-parametric method used in survival analysis to model the relationship between a set of covariates and the time until an event of interest occurs, often referred to as the "time-to-event" or "survival time." This method is particularly useful when dealing with censored data, where the event has not occurred for some individuals by the end of the study period, or when the exact time of the event is unknown.
Building a Survival Tree
Constructing a...

Phylogenetic Trees

Phylogenetic Trees

Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.

The Bronchial Tree

The Bronchial Tree

The human bronchi and bronchial tree play a crucial role in the respiratory system, facilitating the exchange of oxygen and carbon dioxide. Let's delve into the intricate structure and functions of these respiratory components.
The trachea, commonly known as the windpipe, is a tube that connects the larynx (voice box) to the bronchi. At a point called the carina, it bifurcates into two primary bronchi. The right primary bronchus is wider, shorter, and more vertical than the left primary...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

The bi-periodic Horadam sequence and some perturbed tridiagonal 2-Toeplitz matrices: A unified approach.

Heliyon·2022

Same author

On the constant coefficients of a certain recurrence relation: A simple proof.

Heliyon·2021

Same author

Comment on "Thermal transport in dimerized harmonic lattices: Exact solution, crossover behavior, and extended reservoirs".

Physical review. E·2019

Same author

The inverse Wiener polarity index problem for chemical trees.

PloS one·2018

Same author

Class of cooperative stochastic models: Exact and approximate solutions, simulations, and experiments using ionic self-assembly of nanoparticles.

Physical review. E·2016

Search research articles

Related Experiment Video

Updated: Feb 11, 2026

Transforming, Genome Editing and Phenotyping the Nitrogen-fixing Tropical Cannabaceae Tree Parasponia andersonii

Transforming, Genome Editing and Phenotyping the Nitrogen-fixing Tropical Cannabaceae Tree Parasponia andersonii

Published on: August 18, 2019

The minimal-ABC trees with B1-branches.

Darko Dimitrov¹, Zhibin Du², Carlos M da Fonseca³

¹Hochschule für Technik und Wirtschaft Berlin, Wilhelminenhofstraße 75A, D-12459 Berlin, Germany.

|April 19, 2018

Summary

The atom-bond connectivity (ABC) index characterizes molecular topology. This study shows minimal-ABC trees do not contain 4 or 3 B1-branches, advancing tree characterization.

More Related Videos

A Venturi Effect Can Help Cure Our Trees

A Venturi Effect Can Help Cure Our Trees

Published on: October 1, 2013

Technique for Studying Arthropod and Microbial Communities within Tree Tissues

Technique for Studying Arthropod and Microbial Communities within Tree Tissues

Published on: November 16, 2014

Related Experiment Videos

Last Updated: Feb 11, 2026

Transforming, Genome Editing and Phenotyping the Nitrogen-fixing Tropical Cannabaceae Tree Parasponia andersonii

Transforming, Genome Editing and Phenotyping the Nitrogen-fixing Tropical Cannabaceae Tree Parasponia andersonii

Published on: August 18, 2019

A Venturi Effect Can Help Cure Our Trees

A Venturi Effect Can Help Cure Our Trees

Published on: October 1, 2013

Technique for Studying Arthropod and Microbial Communities within Tree Tissues

Technique for Studying Arthropod and Microbial Communities within Tree Tissues

Published on: November 16, 2014

Area of Science:

Chemical graph theory
Mathematical chemistry
Molecular structure analysis

Background:

The atom-bond connectivity (ABC) index is a key molecular descriptor linking chemistry and graph theory.
It is widely applied in predicting bioactivity, chemical thermodynamics, and analyzing various chemical structures.
Characterizing trees with minimal ABC index remains an open problem with significant research interest.

Purpose of the Study:

To advance the characterization of trees with minimal atom-bond connectivity (ABC) index.
To investigate the structural properties of trees that minimize the ABC index.
To contribute to solving the open problem of minimal ABC index trees.

Main Methods:

Graph theory principles applied to molecular structures.
Analysis of tree structures and their topological indices.
Investigating the impact of specific graph features (B1-branches) on the ABC index.

Main Results:

Demonstrated that minimal-ABC trees cannot possess 4 B1-branches.
Proved that minimal-ABC trees cannot possess 3 B1-branches.
Initiated the analysis of minimal-ABC trees with 2 B1-branches.

Conclusions:

Significant progress made towards the full characterization of minimal-ABC trees.
Established constraints on the number of B1-branches in trees with the minimum ABC index.
Opens avenues for further research into the structural properties of extremal trees in chemical graph theory.