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Sand Dollar Larvae Use Cloning To 'Make Change,' Confound Predators
Sand Dollar Larvae Use Cloning To 'Make Change,' Confound Predators
Sand Dollar Larvae Use Cloning To 'Make Change,' Confound Predators
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Biologists find that sand dollar larvae created clones of themselves within 24 hours of being exposed to fish mucous, a cue that predators are near. The cloning process resulted in small new larvae and original larvae that were substantially smaller.
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Other Articles:
| • | Improving inter-observer variability in the evaluation of ultrasonographic features of polycystic ovaries |
| Background: We recently reported poor inter-observer agreement in identifying and quantifying individual ultrasonographic features of polycystic ovaries. Our objective was to determine the effect of a training workshop on reducing inter-observer variation in the ultrasonographic evaluation of polycystic ovaries. Methods: Transvaginal ultrasound recordings from thirty women with polycystic ovary syndrome (PCOS) were evaluated by three radiologists and three reproductive endocrinologists both before and after an ultrasound workshop. The following endpoints were assessed: 1) follicle number per ovary (FNPO), 2) follicle number per single cross-section (FNPS), 3) largest follicle diameter, 4) ovarian volume, 5) follicle distribution pattern and 6) presence of a corpus luteum (CL). Lin's concordance correlation coefficients (rho) and kappa statistics for multiple raters (kappa) were used to assess level of inter-observer agreement (>0.80 good, 0.60 - 0.80 moderate/fair, <0.60 poor). Results: Following the workshop, inter-observer agreement improved for the evaluation of FNPS (rho=0.70, delta rho=+0.11), largest follicle diameter (rho=0.77, delta rho=+0.10), ovarian volume (rho=0.84, delta rho=+0.12), follicle distribution pattern (kappa=0.80, delta kappa=+0.21) and presence of a CL (kappa=0.87, delta kappa=+0.05). No improvement was evident for FNPO (rho=0.54, delta rho=-0.01). Both radiologists and reproductive endocrinologists demonstrated improvement in scores (p<0.001). Conclusions: Reliability in evaluating ultrasonographic features of polycystic ovaries can be significantly improved following participation in a training workshop. If ultrasonographic evidence of polycystic ovaries is to be used as an objective measure in the diagnosis of PCOS, then standardized training modules should be implemented to unify the approach to evaluating polycystic ovarian morphology. | |
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| • | Management of hepatitis B virus |
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Hepatitis B is a common problem worldwide with serious sequelae. Despite the explosion of new agents, management has grown even more complicated. The treatment paradigm is evolving from limited therapy to lifelong viral suppression in several populations. This shift has been a direct result of not only well-tolerated oral medications, but also the increasing recognition that active viral replication leads to untoward events such as cirrhosis, liver failure and hepatocellular carcinoma. However, therapy is not without risk, which includes side effects, cost and drug resistance. Controversy surrounds several clinical questions, including which patients are eligible for therapy, which treatment is optimal and at what point may therapy be discontinued. This commentary will discuss these questions as well as the limitations of the literature used to support our current treatment recommendations. |
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| • | Slippery customer: A greener antiwear additive for engine oils |
| Titanium, a protean element with applications from pigments to aerospace alloys, could get a new role as an environmentally friendly additive for automotive oil, thanks to work by materials scientists from Afton Chemical Corporation (Richmond, Va.) and the National Institute of Standards and Technology (NIST). (2008-07-24) | |
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| • | ASGE issues guidelines on the role of endoscopy in the bariatric surgery patient |
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| • | Agriculture and Horticulture |
| TropHort provides historic and current articles in biology and in the applied life sciences agriculture and horticulture. While focussing on the horticulture of fruits and vegetables, it deals with related environmental topics including biodiversity and global warming. | |
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| • | Stereo Microscopes On Sale |
| Microscopes.com,Stereo Microscopes, ... Stereomicroscopes are used extensively throughout the many fields of microscopy. | |
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ScienceDaily: Cloning News
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- Copyright © 2008 Microsoft. All rights reserved. These XML results may not be used, reproduced or transmitted in any manner or for any purpose other than rendering Live Search results within an RSS aggregator for your personal, non-commercial use. Any other use of these results requires express written permission from Microsoft Corporation. By accessing this web page or using these results in any manner whatsoever, you agree to be bound by the foregoing restrictions. - version: v1.5 build A