Navigation Links
When every photon counts
Date:4/20/2009

rts are termed euchromatin and typically located in the nuclear interior. In contrast, a major part of the ,non-active' more compacted DNA regions, termed heterochromatin, are located in the nuclear periphery. This nuclear architecture is present in nearly all higher organisms since the last 500 million years.

"The arrangement is so universal that one can call it the ,conventional architecture' of the cell nucleus", says Boris Joffe at the Biocenter of the Ludwig Maximilians University (LMU) Munich. "Hence we were very surprised to find marked differences in this architecture - and that they depend on an animal's lifestyle". An interdisciplinary team of researchers at the LMU, the Max Planck Institute for Brain Research in Frankfurt and the Cavendish Laboratory in Cambridge could show that in nocturnal mammals the chromatin arrangement in the rod nuclei is inverted: Here the heterochromatin is lumped in the nuclear interior whereas the less compacted euchromatin with the active DNA regions forms a peripheral shell.

This unusual nuclear architecture is explained by the requirements of vision. In humans and all other vertebrates, the light has to traverse the entire retina to reach the light-sensitive outer segments of the photoreceptors. "And here nocturnal animals face a dilemma. They need lots of rods to detect the little available light - but that makes their retinas thicker, so that more light is lost by scatter and diffusion before it reaches the photoreceptor outer segments", explains Leo Peichl at the Max Planck Institute for Brain Research.

Evolution solved the problem by using a physical property of heterochromatin: Because of its denser packing it has a higher optical refraction index than euchromatin. This has no effect when the heterochromatin lies in the periphery of the nucleus. However when it is lumped in the nuclear core, the heterochromatin acts as a minute collecting lens. As the rod nuclei are arranged in columns, sever
'/>"/>

Contact: Dr. Leo Peichl
peichl@mpih-frankfurt.mpg.de
49-699-676-9348
Max-Planck-Gesellschaft
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Best way to treat malaria: Avoid using same drug for everyone, scientists say
2. MSU biofilms research helps set standards for everyday products
3. Tracking influenzas every movement
4. Everythings coming up corals
5. Not just for the monkeys: New publication shows evolution is everywhere
6. 1 person out of every 1,000 has synaesthesia, in which an individual can smell a sound
7. Photonic crystal biosensors detect protein-DNA interactions
8. The photonic beetle
9. Research at Argonnes Advanced Photon Source reveals structure and behavior of collagen
10. Ecologists say metabolism accounts for why natural selection favors only some species
11. Eltrombopag effective for hepatitis C patients with low blood-platelet counts
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
When every photon counts
(Date:4/23/2014)... million Food Standards Agency (FSA) project to map the ... , Norovirus outbreaks can rapidly affect large numbers ... strawberries infected 11,000 people in Germany, but there are ... cause infection and which foods are the most likely ... produce data that will help the FSA to develop ...
(Date:4/22/2014)... Coral Gables, Fla. (April 21, 2014) -- There are ... out their feathers and spread their colorful tails; satin ... them with blue and shiny objects; and European bitterling ... Each species has evolved a unique method to communicate ... "Signaling can have profound fitness ...
(Date:4/22/2014)... FL, April 22, 2014 Scientists from the Florida ... a protein complex that plays a critical but previously ... The study, which showed a novel role for a ... in the journal eLife , a publisher supported ... Society and the Wellcome Trust. , "This is a ...
Breaking Biology News(10 mins):Best practices in communication for the animal world 2Best practices in communication for the animal world 3Scientists identify critical new protein complex involved in learning and memory 2
... that it will launch a major long-term project to ... The project is made possible by a $10 million ... of Los Angeles-based Tennenbaum Capital Partners and philanthropist. The ... the ocean,s coastal ecosystems over a long period of ...
... University of Illinois cell and developmental Biology professor Fei ... study how myeloids, a type of blood stem cell, ... defense against infections and tissue damage. This approach offers ... myeloid differentiation, and may improve our ability to treat ...
... DCOctober 25, 2012Biomedical and health research and development (R&D) ... billion or 3% between FY10 and FY11 according to ... represents the first drop in overall spending since Research!America ... follows an uptick in research funding attributed to the ...
Cached Biology News:Smithsonian launches global marine biodiversity project with $10 million donation 2Smithsonian launches global marine biodiversity project with $10 million donation 3A new technique to study how myeloids become white blood cells 2US investment in biomedical and health research on downward trend 2
(Date:1/14/2014)... Carahsoft and CDS Federal Services have ... at 2pm EST (11am PST), “Natural Language Processing: Converting ... how technology can turn raw, heterogeneous data into actionable ... The online webinar will last approximately one hour. , ...
(Date:1/14/2014)... AUSTIN, Texas , Jan. 14, 2014 ... analyze and research medicinal plants and therapeutic derivatives ... industry, health professionals, and researchers about the challenges ... (Logo: http://photos.prnewswire.com/prnh/20100430/DC95601LOGO ) The ...
(Date:1/14/2014)... January 14, 2014 Global Record ... innovative information technology solutions for patients, physicians, the ... stakeholders, announced today the signing of a three-year ... and Drug Administration (FDA). This initiative is ...
(Date:1/14/2014)... Altadena, CA (PRWEB) January 14, 2014 ... Angeles County), California, and Montreal, Canada, has big ideas ... and non-fiction. The press's goals are to produce high-quality, ... e-books to support local businesses. , The first ...
Breaking Biology Technology:Webcast - Natural Language Processing: Converting Raw Data into Actionable Knowledge – Hosted by Carahsoft and CDS Federal Services 2World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 2World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 3World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 4World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 5World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 6World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 7World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 8Global Record Systems Announces Research Collaboration Agreement with FDA to Create a Novel “Big Data” Paradigm for Collection of Patient Safety and Outcomes Information 2Bitingduck Press Looks Forward to 2014 With Multimedia E-books 2
... The review process being used by the Food and Drug ... fails to weigh the full effects of the fish,s widespread ... this week,s Science . The salmon, whose genome ... the first genetically modified animal approved for human consumption in ...
... FRAMINGHAM, Mass. and SYDNEY, Nov. 18, 2010 HeartWare ... a leading innovator of less invasive, miniaturized circulatory support ... failure, today announced that CEO Doug Godshall is scheduled ... Piper Jaffray Health Care Conference on Tuesday, November 30, ...
... Patients with Relapsed or Refractory Solid Tumors ... ... (typeof(lpUnit)==,undefined,) var lpUnit=,PRN,; --> ... = ,; var first_result; // Results are keyed by longUrl, so we need to grab the first one. for ...
Cached Biology Technology:FDA review on transgenic salmon too narrow 2FDA review on transgenic salmon too narrow 3HeartWare to Present at the 22nd Annual Piper Jaffray Health Care Conference 2Oncothyreon Reports Positive Data from Phase 1 Clinical Trial of PI3-Kinase Inhibitor PX-866 in Patients with Relapsed or Refractory Solid Tumors 2Oncothyreon Reports Positive Data from Phase 1 Clinical Trial of PI3-Kinase Inhibitor PX-866 in Patients with Relapsed or Refractory Solid Tumors 3Oncothyreon Reports Positive Data from Phase 1 Clinical Trial of PI3-Kinase Inhibitor PX-866 in Patients with Relapsed or Refractory Solid Tumors 4Oncothyreon Reports Positive Data from Phase 1 Clinical Trial of PI3-Kinase Inhibitor PX-866 in Patients with Relapsed or Refractory Solid Tumors 5Oncothyreon Reports Positive Data from Phase 1 Clinical Trial of PI3-Kinase Inhibitor PX-866 in Patients with Relapsed or Refractory Solid Tumors 6Oncothyreon Reports Positive Data from Phase 1 Clinical Trial of PI3-Kinase Inhibitor PX-866 in Patients with Relapsed or Refractory Solid Tumors 7Oncothyreon Reports Positive Data from Phase 1 Clinical Trial of PI3-Kinase Inhibitor PX-866 in Patients with Relapsed or Refractory Solid Tumors 8Oncothyreon Reports Positive Data from Phase 1 Clinical Trial of PI3-Kinase Inhibitor PX-866 in Patients with Relapsed or Refractory Solid Tumors 9Oncothyreon Reports Positive Data from Phase 1 Clinical Trial of PI3-Kinase Inhibitor PX-866 in Patients with Relapsed or Refractory Solid Tumors 10
Quartz-Halogen, 100 W, High Intensity...
... Normal;heading 1;heading 2;Many ... and experimental situations ... standard transfection and ... systems. ViraPower Lentiviral ...
The product contains 10 ml Dynabeads Epoxy (4.5 m). Supplied at 4 x 10 8 beads/ml...
...
Biology Products: