Results 291 to 300 of about 1,447,270 (322)

The Nucleus of the Atom

1983
Beginning in the 1890s, Lenard investigated the attenuation of electron beams passing through matter. This attenuation can have two causes: the electrons can lose their energy by exciting or ionising atoms, or they can be elastically scattered and so change their directions and leave the beam.
Hans Christoph Wolf, Hermann Haken
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Reversal of experimental parkinsonism by lesions of the subthalamic nucleus.

Science, 1990
Although it is known that Parkinson's disease results from a loss of dopaminergic neurons in the substantia nigra, the resulting alterations in activity in the basal ganglia responsible for parkinsonian motor deficits are still poorly characterized ...
H. Bergman, T. Wichmann, M. DeLong
semanticscholar   +1 more source

The nucleus

2010
Publisher Summary This chapter focuses on the nucleus of a cell, which is a large disklike, lobed, or spherical organelle of about 10 μm in diameter, the morphology of which depends on the activity of the cell. It contains the DNA of the cell and is surrounded by an envelope composed of two concentric membranes made up of lipids and proteins.
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Nucleus-nucleus collision as superposition of nucleon-nucleus collisions

Nuclear Physics B - Proceedings Supplements, 1999
Abstract Angular distributions of charged particles produced in 16O and 32S collisions with nuclear track emulsion were studied at momenta 4.5 and 200 A GeV/c. Comparison with the angular distributions of charged particles produced in proton-nucleus collisions at the same momentum allows to draw the conclusion, that the angular distributions in ...
S. K. Badyal, N. Saidkhanov, E. R. Ganssauge, S.Q. Feng, S. Lokanathan, Dong-Hai Zhang, Alexander Kovalenko, U. Henjes, T. P. Trofimova, L.Z. Yu, L. N. Svechnikova, G.M. Chen, I. Otterlund, K. El Chenawi, A. S. Gaitinov, Janka Vrlakova, K. B. Bhalla, D. C. Zhou, V. I. Bubnov, X.R. Wang, E. Stenlund, B. Singh, S. Garpman, M. I. Adamovich, Joakim Nystrand, I. S. Mittra, C.B. Yang, M. I. Tretyakova, R. J. Wilkes, G. I. Orlova, A.M. Tawfik, Z.B. Yin, L. K. Mangotra, W. Y. Qian, M. Tothova, E. S. Basova, S. P. Kharlamov, N. S. Lukicheva, V. G. Larionova, M. Karabova, N. K. Rao, D. Skelding, P. Y. Zheng, J. Grote, J. J. Lord, A.K. Musaeva, H.Q. Wang, K. Soderstrem, V. Kumar, N. P. Andreeva, L. P. Chernova, Anju Bhasin, U.I. Tuleeva, Rashmi Raniwala, Bo Jakobsson, Z. Q. Weng, Y.M. Qin, N. A. Salmanova, M.M. Chernyaysky, V. Bradnova, S. G. Gerassimov, R. Sethi, V. S. Bhatia, I. Manhas, S. I. Zhokhova, S. Vokal, V. V. Rusakova, Vivek K. Gupta, S.A. Krasnov, S.Z. Nasyrov, A.M. Seitimbetov, A. Gheata, Y. A. Alexandrov, K. G. Gulamov, S. K. Gupta, S. Dhamija, M. Gheata, T. Svensson, Madan M. Aggarwal, X. Cai, S. B. Luo, M. Roeper, V. Vashisht, L. S. Liu, E. K. Kanygina, Y.X. Li, D. Felea, N. G. Peresadko, I. Y. Chasnikov, V. S. Navotny, Y. Lu   +90 more
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Transplanted suprachiasmatic nucleus determines circadian period.

Science, 1990
The pacemaker role of the suprachiasmatic nucleus in a mammalian circadian system was tested by neural transplantation by using a mutant strain of hamster that shows a short circadian period.
M. Ralph, R. Foster, F. Davis, M. Menaker   +3 more
semanticscholar   +1 more source

On the nucleus structure and activity of comet 67P/Churyumov-Gerasimenko

Science, 2015
Images from the OSIRIS scientific imaging system onboard Rosetta show that the nucleus of 67P/Churyumov-Gerasimenko consists of two lobes connected by a short neck. The nucleus has a bulk density less than half that of water.
H. Sierks, C. Barbieri, P. Lamy, R. Rodrigo, D. Koschny, H. Rickman, H. Keller, J. Agarwal, M. A’Hearn, F. Angrilli, A. Auger, M. Barucci, J. Bertaux, I. Bertini, S. Besse, D. Bodewits, C. Capanna, G. Cremonese, V. Da Deppo, B. Davidsson, S. Debei, M. De Cecco, F. Ferri, S. Fornasier, M. Fulle, R. Gaskell, L. Giacomini, O. Groussin, P. Gutierrez-Marques, P. Gutiérrez, C. Güttler, N. Hoekzema, S. Hviid, W. Ip, L. Jorda, J. Knollenberg, G. Kovacs, J. Kramm, E. Kührt, M. Küppers, F. La Forgia, L. Lara, M. Lazzarin, C. Leyrat, J. L. Lopez Moreno, S. Magrin, S. Marchi, F. Marzari, M. Massironi, H. Michalik, R. Moissl, S. Mottola, G. Naletto, N. Oklay, M. Pajola, M. Pertile, F. Preusker, L. Sabau, F. Scholten, C. Snodgrass, N. Thomas, C. Tubiana, J. Vincent, K. Wenzel, M. Zaccariotto, M. Pätzold   +65 more
semanticscholar   +1 more source

Cholinergic innervation of cortex by the basal forebrain: Cytochemistry and cortical connections of the septal area, diagonal band nuclei, nucleus basalis (Substantia innominata), and hypothalamus in the rhesus monkey

The Journal of comparative neurology, 1983
The organization of projections from the cholinergic neurons of the basal forebrain to neocortex and associated structures was investigated in the rhesus monkey with the help of horseradish peroxidase transport, acetyl‐cholinesterase histochemistry, and ...
M. Mesulam, E. Mufson, A. Levey, B. Wainer   +3 more
semanticscholar   +1 more source

Inactivation of Hippocampus or Caudate Nucleus with Lidocaine Differentially Affects Expression of Place and Response Learning

Neurobiology of Learning and Memory, 1996
Involvement of the hippocampus and caudate nucleus in place and response learning was examined by functionally inactivating these brain regions bilaterally with infusions of lidocaine.
M. Packard, J. D. McGaugh
semanticscholar   +1 more source

Quark model for nucleus-nucleus collisions

Physical Review C, 1987
We present a simple quark model for nucleus-nucleus collisions which employs the Glauber multiple scattering theory. The model is first used to fit a quark-quark scattering amplitude to high energy nucleon-nucleon elastic scattering data. This amplitude is then used to calculate high energy \ensuremath{\alpha}p and \ensuremath{\alpha}\ensuremath{\alpha}
openaire   +2 more sources

Highly Relativistic Nucleus-Nucleus Collisions: The Central Rapidity Region

, 1983
The space-time evolution of the hadronic matter produced in the central rapidity region in extreme relativistic nucleus-nucleus collisions is described.
J. Bjorken
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