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  • American Association for the Advancement of Science (AAAS)
  • 2005-2009  (7)
  • 1920-1924
  • 1
    Publication Date: 2008-05-24
    Description: Materials are typically ductile at higher temperatures and become brittle at lower temperatures. In contrast to the typical ductile-to-brittle transition behavior of body-centered cubic (bcc) steels, we observed an inverse temperature dependence of toughness in an ultrahigh-strength bcc steel with an ultrafine elongated ferrite grain structure that was processed by a thermomechanical treatment without the addition of a large amount of an alloying element. The enhanced toughness is attributed to a delamination that was a result of crack branching on the aligned {100} cleavage planes in the bundles of the ultrafine elongated ferrite grains strengthened by nanometer-sized carbides. In the temperature range from 60 degrees to -60 degrees C, the yield strength was greater, leading to the enhancement of the toughness.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kimura, Yuuji -- Inoue, Tadanobu -- Yin, Fuxing -- Tsuzaki, Kaneaki -- New York, N.Y. -- Science. 2008 May 23;320(5879):1057-60. doi: 10.1126/science.1156084.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan. kimura.yuuji@nims.go.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18497294" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2005-11-29
    Description: The estimation of the reward an action will yield is critical in decision-making. To elucidate the role of the basal ganglia in this process, we recorded striatal neurons of monkeys who chose between left and right handle turns, based on the estimated reward probabilities of the actions. During a delay period before the choices, the activity of more than one-third of striatal projection neurons was selective to the values of one of the two actions. Fewer neurons were tuned to relative values or action choice. These results suggest representation of action values in the striatum, which can guide action selection in the basal ganglia circuit.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Samejima, Kazuyuki -- Ueda, Yasumasa -- Doya, Kenji -- Kimura, Minoru -- New York, N.Y. -- Science. 2005 Nov 25;310(5752):1337-40.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Computational Neurobiology, ATR Computational Neuroscience Laboratories, 619-0288 Kyoto, Japan. samejima@lab.tamagawa.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16311337" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Brain Mapping ; Caudate Nucleus/*physiology ; *Choice Behavior ; Corpus Striatum/*physiology ; Female ; Macaca ; Male ; Neurons/*physiology ; Probability ; Putamen/*physiology ; Regression Analysis ; Reinforcement (Psychology) ; *Reward
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2005-06-18
    Description: Activity in several areas of the human brain and the monkey brain increases when a subject anticipates events associated with a reward, implicating a role for bias of decision and action. However, in real life, events do not always appear as expected, and we must choose an undesirable action. More than half of the neurons in the monkey centromedian (CM) thalamus were selectively activated when a small-reward action was required but a large-reward option was anticipated. Electrical stimulation of the CM after a large-reward action request substituted a brisk performance with a sluggish performance. These results suggest involvement of the CM in a mechanism complementary to decision and action bias.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Minamimoto, Takafumi -- Hori, Yukiko -- Kimura, Minoru -- New York, N.Y. -- Science. 2005 Jun 17;308(5729):1798-801.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15961671" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Behavior, Animal ; Decision Making ; Electric Stimulation ; Electrophysiology ; Macaca ; Neurons/*physiology ; Probability ; Reaction Time ; *Reward ; Task Performance and Analysis ; Thalamic Nuclei/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 2006-09-16
    Description: We demonstrated that ultraviolet Raman spectroscopy is an effective technique to measure the transition temperature (Tc) in ferroelectric ultrathin films and superlattices. We showed that one-unit-cell-thick BaTiO3 layers in BaTiO3/SrTiO3 superlattices are not only ferroelectric (with Tc as high as 250 kelvin) but also polarize the quantum paraelectric SrTiO3 layers adjacent to them. Tc was tuned by approximately 500 kelvin by varying the thicknesses of the BaTiO3 and SrTiO3 layers, revealing the essential roles of electrical and mechanical boundary conditions for nanoscale ferroelectricity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tenne, D A -- Bruchhausen, A -- Lanzillotti-Kimura, N D -- Fainstein, A -- Katiyar, R S -- Cantarero, A -- Soukiassian, A -- Vaithyanathan, V -- Haeni, J H -- Tian, W -- Schlom, D G -- Choi, K J -- Kim, D M -- Eom, C B -- Sun, H P -- Pan, X Q -- Li, Y L -- Chen, L Q -- Jia, Q X -- Nakhmanson, S M -- Rabe, K M -- Xi, X X -- New York, N.Y. -- Science. 2006 Sep 15;313(5793):1614-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Pennsylvania State University, University Park, PA 16802, USA. dmitritenne@boisestate.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16973874" target="_blank"〉PubMed〈/a〉
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
    Publication Date: 2006-07-29
    Description: Volcanism on Earth is known to occur in three tectonic settings: divergent plate boundaries (such as mid-ocean ridges), convergent plate boundaries (such as island arcs), and hot spots. We report volcanism on the 135 million-year-old Pacific Plate not belonging to any of these categories. Small alkalic volcanoes form from small percent melts and originate in the asthenosphere, as implied by their trace element geochemistry and noble gas isotopic compositions. We propose that these small volcanoes erupt along lithospheric fractures in response to plate flexure during subduction. Minor extents of asthenospheric melting and the volcanoes' tectonic alignment and age progression in the direction opposite to that of plate motion provide evidence for the presence of a small percent melt in the asthenosphere.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hirano, Naoto -- Takahashi, Eiichi -- Yamamoto, Junji -- Abe, Natsue -- Ingle, Stephanie P -- Kaneoka, Ichiro -- Hirata, Takafumi -- Kimura, Jun-Ichi -- Ishii, Teruaki -- Ogawa, Yujiro -- Machida, Shiki -- Suyehiro, Kiyoshi -- New York, N.Y. -- Science. 2006 Sep 8;313(5792):1426-8. Epub 2006 Jul 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan. nhirano@ucsd.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16873612" target="_blank"〉PubMed〈/a〉
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
    Publication Date: 2008-04-12
    Description: Temperature is an unavoidable environmental cue that affects the metabolism and behavior of any creature on Earth, yet how animals perceive temperature is poorly understood. The nematode Caenorhabditis elegans "memorizes" temperatures, and this stored information modifies its subsequent migration along a temperature gradient. We show that the olfactory neuron designated AWC senses temperature. Calcium imaging revealed that AWC responds to temperature changes and that response thresholds differ depending on the temperature to which the animal was previously exposed. In the mutant with impaired heterotrimeric guanine nucleotide-binding protein (G protein)-mediated signaling, AWC was hyperresponsive to temperature, whereas the AIY interneuron (which is postsynaptic to AWC) was hyporesponsive to temperature. Thus, temperature sensation exhibits a robust influence on a neural circuit controlling a memory-regulated behavior.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kuhara, Atsushi -- Okumura, Masatoshi -- Kimata, Tsubasa -- Tanizawa, Yoshinori -- Takano, Ryo -- Kimura, Koutarou D -- Inada, Hitoshi -- Matsumoto, Kunihiro -- Mori, Ikue -- New York, N.Y. -- Science. 2008 May 9;320(5877):803-7. doi: 10.1126/science.1148922. Epub 2008 Apr 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Group of Molecular Neurobiology, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18403676" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Caenorhabditis elegans/*physiology ; Caenorhabditis elegans Proteins/genetics/physiology ; Calcium/metabolism ; GTP-Binding Protein Regulators/genetics/physiology ; GTP-Binding Proteins/genetics/metabolism ; Olfactory Pathways/physiology ; Olfactory Receptor Neurons/*physiology ; Signal Transduction ; Thermosensing/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
    Publication Date: 2009-12-17
    Description: Asia harbors substantial cultural and linguistic diversity, but the geographic structure of genetic variation across the continent remains enigmatic. Here we report a large-scale survey of autosomal variation from a broad geographic sample of Asian human populations. Our results show that genetic ancestry is strongly correlated with linguistic affiliations as well as geography. Most populations show relatedness within ethnic/linguistic groups, despite prevalent gene flow among populations. More than 90% of East Asian (EA) haplotypes could be found in either Southeast Asian (SEA) or Central-South Asian (CSA) populations and show clinal structure with haplotype diversity decreasing from south to north. Furthermore, 50% of EA haplotypes were found in SEA only and 5% were found in CSA only, indicating that SEA was a major geographic source of EA populations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉HUGO Pan-Asian SNP Consortium -- Abdulla, Mahmood Ameen -- Ahmed, Ikhlak -- Assawamakin, Anunchai -- Bhak, Jong -- Brahmachari, Samir K -- Calacal, Gayvelline C -- Chaurasia, Amit -- Chen, Chien-Hsiun -- Chen, Jieming -- Chen, Yuan-Tsong -- Chu, Jiayou -- Cutiongco-de la Paz, Eva Maria C -- De Ungria, Maria Corazon A -- Delfin, Frederick C -- Edo, Juli -- Fuchareon, Suthat -- Ghang, Ho -- Gojobori, Takashi -- Han, Junsong -- Ho, Sheng-Feng -- Hoh, Boon Peng -- Huang, Wei -- Inoko, Hidetoshi -- Jha, Pankaj -- Jinam, Timothy A -- Jin, Li -- Jung, Jongsun -- Kangwanpong, Daoroong -- Kampuansai, Jatupol -- Kennedy, Giulia C -- Khurana, Preeti -- Kim, Hyung-Lae -- Kim, Kwangjoong -- Kim, Sangsoo -- Kim, Woo-Yeon -- Kimm, Kuchan -- Kimura, Ryosuke -- Koike, Tomohiro -- Kulawonganunchai, Supasak -- Kumar, Vikrant -- Lai, Poh San -- Lee, Jong-Young -- Lee, Sunghoon -- Liu, Edison T -- Majumder, Partha P -- Mandapati, Kiran Kumar -- Marzuki, Sangkot -- Mitchell, Wayne -- Mukerji, Mitali -- Naritomi, Kenji -- Ngamphiw, Chumpol -- Niikawa, Norio -- Nishida, Nao -- Oh, Bermseok -- Oh, Sangho -- Ohashi, Jun -- Oka, Akira -- Ong, Rick -- Padilla, Carmencita D -- Palittapongarnpim, Prasit -- Perdigon, Henry B -- Phipps, Maude Elvira -- Png, Eileen -- Sakaki, Yoshiyuki -- Salvador, Jazelyn M -- Sandraling, Yuliana -- Scaria, Vinod -- Seielstad, Mark -- Sidek, Mohd Ros -- Sinha, Amit -- Srikummool, Metawee -- Sudoyo, Herawati -- Sugano, Sumio -- Suryadi, Helena -- Suzuki, Yoshiyuki -- Tabbada, Kristina A -- Tan, Adrian -- Tokunaga, Katsushi -- Tongsima, Sissades -- Villamor, Lilian P -- Wang, Eric -- Wang, Ying -- Wang, Haifeng -- Wu, Jer-Yuarn -- Xiao, Huasheng -- Xu, Shuhua -- Yang, Jin Ok -- Shugart, Yin Yao -- Yoo, Hyang-Sook -- Yuan, Wentao -- Zhao, Guoping -- Zilfalil, Bin Alwi -- Indian Genome Variation Consortium -- New York, N.Y. -- Science. 2009 Dec 11;326(5959):1541-5. doi: 10.1126/science.1177074.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20007900" target="_blank"〉PubMed〈/a〉
    Keywords: Algorithms ; Asia ; Asian Continental Ancestry Group/*genetics/history ; Bayes Theorem ; Cluster Analysis ; *Emigration and Immigration/history ; Ethnic Groups/*genetics/history ; Gene Flow ; Genotype ; Geography ; *Haplotypes ; History, Ancient ; Humans ; Language ; Linguistics ; Oligonucleotide Array Sequence Analysis ; Phylogeny ; *Polymorphism, Single Nucleotide ; Principal Component Analysis
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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