Navigation Links
Osmosis is not driven by water dilution
Date:4/4/2013

imited to liquids," he says. "But it works just fine for gases, too."

(2) "Another misconception that osmosis requires an attractive force," he says. "It doesn't. When water fills the bag of sugar, it's not because the sugar is pulling the water in. That's not part of the explanation."

(3) "A misconception is that osmosis always happens down a concentration gradient," he says. "When you dissolve something in water, the water doesn't necessarily get more diluted. Depending on the substance, it can get more concentrated."

(4) "Anther misconception is that you don't need to invoke a force to explain why the water flows into the bag. It's thought that, like diffusion, it's a spontaneous process," he says. "But, in fact, there is a force. It's complicated how it happens, but it turns out that the membrane or the bag, in the familiar lab demonstration exerts a force that pushes the water in."

"These misconceptions are surprisingly robust," says Kramer. "Nearly all have been discussed by other authors during the long history of osmotic research, and yet they continue to find believers in each generation of professionals. While authors in physics and biophysics have generally settled on the correct understanding of osmosis, these ideas have not penetrated into the fields of chemistry and biology. It's very surprising that, in 60 years, no physicist talked to a chemist long enough to figure this out."


'/>"/>

Contact: Eric Kramer
ekramer@simons-rock.edu
413-528-7476
Dick Jones Communications
Source:Eurekalert

Page: 1 2

Related biology news :

1. Global Surgical Devices Market Growth Driven by Improving Standards of Living and Longer Life Expectancies, Research Shows
2. Global warming has driven Europes mountain plants to migrate 2.7 meters upwards in 7 years
3. Medical device, health professionals attend first national conference on value-driven engineering
4. The academic jungle: Ecosystem model reveals why women are driven out of science
5. Fluctuating environment may have driven human evolution
6. Saber-toothed cats in California were not driven to extinction by lack of food
7. Photovoltaics beat biofuels at converting suns energy to miles driven
8. Ozone treated water v. lethal microbial material
9. Unexpected crustacean diversity discovered in northern freshwater ecosystems
10. New methods for better purification of wastewater
11. Costs for changing pollution criteria in Florida waters likely to exceed EPA estimates
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/30/2014)... Lewis Carroll,s Through the Looking Glass, collaborators from ... Singapore improved a 35-year-old ecology model to better ... of years. , The new model, called a ... Queen Effect," an evolutionary hypothesis introduced by Lee ... organisms must constantly increase their fitness (or ability ...
(Date:7/30/2014)... (ACS) announced today that David L. Kaplan, Ph.D., will ... & Engineering as editor-in-chief. With the first issue ... will feature high-quality research in the rapidly burgeoning field ... materials that interact with living or biological systems. , ... tremendous growth in the field of biomaterials over the ...
(Date:7/30/2014)... Everybody knows the shortest distance between two points is ... that sperm have been taking the familiar axiom to ... usually thought to be intense, with each racing for ... in some species, sperm form cooperative groups that allow ... , A new study, conducted by Heidi Fisher, ...
Breaking Biology News(10 mins):Classic Lewis Carroll character inspires new ecological model 2Classic Lewis Carroll character inspires new ecological model 3ACS Biomaterials Science & Engineering: Brand-new journal launches in 2015, names editor 2When cooperation counts 2When cooperation counts 3
... imagines moving a limb, cells in the part of ... trying to make the immobile limb work again. Despite ... between brain and muscle, the region where the signals ... years, neuroscientists and neuroengineers working in prosthetics have begun ...
... a common goal: making the invisible visible. Yet artistically ... careers. A new four-year, $1.2 million program led by ... and physics of color into a series of summer ... art-interested students to enter careers in science. , ...
... Notre Dame researcher Robert Nerenberg can tell you many ... including their significant carbon footprint, energy demands and chemical ... drastically improve the energy efficiency of wastewater treatment. He ... promising new line of research that has the capability ...
Cached Biology News:A better thought-controlled computer cursor 2A better thought-controlled computer cursor 3A better thought-controlled computer cursor 4A better thought-controlled computer cursor 5New programs draws young artists into science 2Notre Dame research could improve sustainability and cost effectiveness of wastewater treatment 2
(Date:7/31/2014)... July 31, 2014  Smith & Nephew (LSE:SN, ... technology business, today announced its entry into the ... Lesser Toe Repair System. Comprised of three separate ... metatarsophalangeal (MTP) ligament repair and reconstruction, a metatarsal ... proximal Inter-phalanges (PIP) fusion, also known as hammer ...
(Date:7/31/2014)... 31, 2014 Although RNA-Sequencing is ... first transcriptome-wide analyses appearing around 2008, RNA-Sequencing has ... RNA measurement. In the last several years, assays ... work with smaller input amounts, process degraded RNA, ... samples). On the bioinformatics side, there have been ...
(Date:7/31/2014)... 2014 Boston’s Adult Stem Cell Technology ... innovative adult stem cell biotechnologies. Currently the company ... three additional patent applications currently under examination by the ... address two of the most vexing problems in adult ... stem cells are difficult to identify; and they have ...
(Date:7/30/2014)... 30, 2014  Decision Resources Group finds that ... in the United States ... penetration will be the level of savings achievable ... expected lower cost to patients. Payers plan to ... their pricing expectations in order to encourage physician ...
Breaking Biology Technology:Smith & Nephew scores a HAT-TRICK with its entry into the high-growth hammer toe repair market 2Smith & Nephew scores a HAT-TRICK with its entry into the high-growth hammer toe repair market 3Smith & Nephew scores a HAT-TRICK with its entry into the high-growth hammer toe repair market 4The Evolution of RNA-Sequencing, Upcoming Live Webinar August 22 hosted by Xtalks 2The Adult Stem Cell Technology Center, LLC Launches A Marketing Campaign To License Adult Stem Cell Biotechnologies 2The Adult Stem Cell Technology Center, LLC Launches A Marketing Campaign To License Adult Stem Cell Biotechnologies 3Surveyed U.S. Payers Expect Cost Savings to MCOs and Patients to be the Strongest Drivers of Biosimilar Uptake 2Surveyed U.S. Payers Expect Cost Savings to MCOs and Patients to be the Strongest Drivers of Biosimilar Uptake 3
... in Quality Operations and Medical Affairs, NEW YORK, ... today announced that Lou DeBergalis has joined the,Company as ... MD, will join the Company later this month in ... and Dr. Grossman will,report directly to Michael S. Weiss, ...
... ourselves against bacterial foes is to hide their food, ... by Vanderbilt University investigators has now discovered that a ... of staph bacteria by sopping up manganese and zinc. ... the notion that binding metals to starve bacteria ...
... Distribution ... Partnership, ST. ... with Atlas Antibodies to,distribute Prestige Antibodies(TM) -- developed by the Human ... of 1800 antibodies, the library is expected to grow by,several thousand ...
Cached Biology Technology:Keryx Biopharmaceuticals Announces Additions to Management Team 2Keryx Biopharmaceuticals Announces Additions to Management Team 3Keryx Biopharmaceuticals Announces Additions to Management Team 4Immune system protein starves 'staph' bacteria 2Immune system protein starves 'staph' bacteria 3Sigma-Aldrich Announces New Prestige Antibodies(TM) Line for Proteomics and Cell Biology Researchers 2Sigma-Aldrich Announces New Prestige Antibodies(TM) Line for Proteomics and Cell Biology Researchers 3
Experion Pro260 chips are the microfluidic chips used to perform protein analysis with the Experion automated electrophoresis system. Each chip has the capacity to run 10 protein samples. Supplied as...
... discovery system miniaturizes, integrates and automates ... LabChip technology, the LabChip 3000 performs ... flow fashion. LabChip assays are separations-based, ... what is achievable in homogenous, well-based ...
... range are part of your production or ... particle size is important to you. You ... the component populations in your sample every ... uses Photon Correlation Spectroscopy (PCS) , which ...
... Fermentation System to achieve high experimental ... maximum information output 4 up ... with small-scale requirements provides users with ... E.coli, Pichia pastoris, yeast, fungi or ...
Biology Products: