Cohesion of Water Molecules


Related Posts:


Water transport in plants. Because of the properties of cohesion and adhesion, the tallest trees can transport water more than 100 m upward—approximately one-quarter the height of the Empire State Building in New York City.
Source: Urry, Lisa A.. Campbell Biology (p. 46). Pearson Education. Kindle Edition.

Cohesion of Water Molecules (Campbell Biology)

Water molecules stay close to each other as a result of hydrogen bonding. Although the arrangement of molecules in a sample of liquid water is constantly changing, at any given moment many of the molecules are linked by multiple hydrogen bonds. These linkages make water more structured than most other liquids. Collectively, the hydrogen bonds hold the substance together, a phenomenon called cohesion.

Cohesion due to hydrogen bonding contributes to the transport of water and dissolved nutrients against gravity in plants. Water from the roots reaches the leaves through a network of water-conducting cells. As water evaporates from a leaf, hydrogen bonds cause water molecules leaving the veins to tug on molecules farther down, and the upward pull is transmitted through the water-conducting cells all the way to the roots. Adhesion, the clinging of one substance to another, also plays a role. Adhesion of water by hydrogen bonds to the molecules of cell walls helps counter the downward pull of gravity.

Related to cohesion is surface tension, a measure of how difficult it is to stretch or break the surface of a liquid. At the interface between water and air is an ordered arrangement of water molecules, hydrogen-bonded to one another and to the water below, but not to the air above. This asymmetry gives water an unusually high surface tension, making it behave as though it were coated with an invisible film. You can observe the surface tension of water by slightly overfilling a drinking glass; the water will stand above the rim.

Source:

Urry, Lisa A.. Campbell Biology. Pearson Education. Kindle Edition. https://www.pearson.com/us/higher-education/series/Campbell-Biology-Series/2244849.html

Related Research

Research Article: Towards Ligand Docking Including Explicit Interface Water Molecules

Date Published: June 28, 2013 Publisher: Public Library of Science Author(s): Gordon Lemmon, Jens Meiler, Yaakov Koby Levy. http://doi.org/10.1371/journal.pone.0067536 Abstract: Small molecule docking predicts the interaction of a small molecule ligand with a protein at atomic-detail accuracy including position and conformation the ligand but also conformational changes of the protein upon ligand binding. While successful … Continue reading

Research Article: Interfacial water molecules at biological membranes: Structural features and role for lateral proton diffusion

Date Published: February 23, 2018 Publisher: Public Library of Science Author(s): Trung Hai Nguyen, Chao Zhang, Ewald Weichselbaum, Denis G. Knyazev, Peter Pohl, Paolo Carloni, Colin Johnson. http://doi.org/10.1371/journal.pone.0193454 Abstract: Proton transport at water/membrane interfaces plays a fundamental role for a myriad of bioenergetic processes. Here we have performed ab initio molecular dynamics simulations of proton … Continue reading

Research Article: Rapid and Accurate Prediction and Scoring of Water Molecules in Protein Binding Sites

Date Published: March 1, 2012 Publisher: Public Library of Science Author(s): Gregory A. Ross, Garrett M. Morris, Philip C. Biggin, Peter Csermely. http://doi.org/10.1371/journal.pone.0032036 Abstract: Water plays a critical role in ligand-protein interactions. However, it is still challenging to predict accurately not only where water molecules prefer to bind, but also which of those water molecules might … Continue reading

Research Article: Ubiquitous Water-Soluble Molecules in Aquatic Plant Exudates Determine Specific Insect Attraction

Date Published: October 8, 2008 Publisher: Public Library of Science Author(s): Julien Sérandour, Stéphane Reynaud, John Willison, Joëlle Patouraux, Thierry Gaude, Patrick Ravanel, Guy Lempérière, Muriel Raveton, Tom Pizzari. http://doi.org/10.1371/journal.pone.0003350 Abstract: Plants produce semio-chemicals that directly influence insect attraction and/or repulsion. Generally, this attraction is closely associated with herbivory and has been studied mainly under atmospheric … Continue reading

Research Article: Electromagnetic field in human sperm cryopreservation improves fertilizing potential of thawed sperm through physicochemical modification of water molecules in freezing medium

Date Published: September 5, 2019 Publisher: Public Library of Science Author(s): Dariush Gholami, Seyed Mahmood Ghaffari, Gholamhossein Riazi, Rouhollah Fathi, James Benson, Abdolhossein Shahverdi, Mohsen Sharafi, Stefan Schlatt. http://doi.org/10.1371/journal.pone.0221976 Abstract: Physicochemical properties of water molecules as the main compositions of the freezing media can be affected by the electromagnetic fled. The purpose of this study … Continue reading