Search Results - (Author, Cooperation:N. Martinez)
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1FIS Bildung LiteraturdatenbankMarín, N. Martínez [Verfasser] ; Solano, I. [Verfasser] ; Jiménez, E. Gómez [Verfasser]
Published 2001Staff ViewType of Medium: articlePublication Date: 2001Keywords: Forschungsmethode ; Vorstellung (Psy) ; Schüler ; Kraft (Phys) ; Forschungsentwicklung ; KonzeptIn: International journal of science education, Bd. 23 (2001) H. 7, S. 663-690, 0950-0693Language: English -
2Latest Papers from Table of Contents or Articles in PressPerez-Carmona, N., Martinez-Vicente, P., Farre, D., Gabaev, I., Messerle, M., Engel, P., Angulo, A.
The American Society for Microbiology (ASM)
Published 2018Staff ViewPublication Date: 2018-04-14Publisher: The American Society for Microbiology (ASM)Print ISSN: 0022-538XElectronic ISSN: 1098-5514Topics: MedicinePublished by: -
3Latest Papers from Table of Contents or Articles in PressR. N. Martinez ; P. C. Sereno ; O. A. Alcober ; C. E. Colombi ; P. R. Renne ; I. P. Montanez ; B. S. Currie
American Association for the Advancement of Science (AAAS)
Published 2011Staff ViewPublication Date: 2011-01-15Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Animals ; Argentina ; Biological Evolution ; Bone and Bones/anatomy & histology ; Dinosaurs/*anatomy & histology/*classification ; Extinction, Biological ; Femur/anatomy & histology ; *Fossils ; Phylogeny ; Skull/anatomy & histology ; Spine/anatomy & histologyPublished by: -
4Latest Papers from Table of Contents or Articles in PressF. Braga-Ribas ; B. Sicardy ; J. L. Ortiz ; C. Snodgrass ; F. Roques ; R. Vieira-Martins ; J. I. Camargo ; M. Assafin ; R. Duffard ; E. Jehin ; J. Pollock ; R. Leiva ; M. Emilio ; D. I. Machado ; C. Colazo ; E. Lellouch ; J. Skottfelt ; M. Gillon ; N. Ligier ; L. Maquet ; G. Benedetti-Rossi ; A. Ramos Gomes, Jr. ; P. Kervella ; H. Monteiro ; R. Sfair ; M. El Moutamid ; G. Tancredi ; J. Spagnotto ; A. Maury ; N. Morales ; R. Gil-Hutton ; S. Roland ; A. Ceretta ; S. H. Gu ; X. B. Wang ; K. Harpsoe ; M. Rabus ; J. Manfroid ; C. Opitom ; L. Vanzi ; L. Mehret ; L. Lorenzini ; E. M. Schneiter ; R. Melia ; J. Lecacheux ; F. Colas ; F. Vachier ; T. Widemann ; L. Almenares ; R. G. Sandness ; F. Char ; V. Perez ; P. Lemos ; N. Martinez ; U. G. Jorgensen ; M. Dominik ; F. Roig ; D. E. Reichart ; A. P. LaCluyze ; J. B. Haislip ; K. M. Ivarsen ; J. P. Moore ; N. R. Frank ; D. G. Lambas
Nature Publishing Group (NPG)
Published 2014Staff ViewPublication Date: 2014-03-29Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsPublished by: -
5Latest Papers from Table of Contents or Articles in PressO. Thaunat ; A. G. Granja ; P. Barral ; A. Filby ; B. Montaner ; L. Collinson ; N. Martinez-Martin ; N. E. Harwood ; A. Bruckbauer ; F. D. Batista
American Association for the Advancement of Science (AAAS)
Published 2012Staff ViewPublication Date: 2012-01-28Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Animals ; *Antigen Presentation ; Antigens/*analysis/*immunology ; B-Lymphocytes/cytology/*immunology ; Cell Division ; Cell Proliferation ; Cells, Cultured ; Coculture Techniques ; Computer Simulation ; Flow Cytometry ; *Lymphocyte Activation ; Mice ; Mice, Inbred C57BL ; Mice, Transgenic ; Models, Immunological ; Muramidase/analysis/immunology ; T-Lymphocytes/*immunologyPublished by: -
6Latest Papers from Table of Contents or Articles in Pressde Vries, E., Rincon, C. J., Tamayo Martinez, N., Rodriguez, N., Tiemeier, H., Mackenbach, J. P., Gomez-Restrepo, C., Guarnizo-Herreno, C. C.
BMJ Publishing
Published 2018Staff ViewPublication Date: 2018-06-08Publisher: BMJ PublishingElectronic ISSN: 2044-6055Topics: MedicineKeywords: Public health, Open access, EpidemiologyPublished by: -
7Latest Papers from Table of Contents or Articles in PressT. B. Shiell, D. G. McCulloch, D. R. McKenzie, M. R. Field, B. Haberl, R. Boehler, B. A. Cook, C. de Tomas, I. Suarez-Martinez, N. A. Marks, and J. E. Bradby
American Physical Society (APS)
Published 2018Staff ViewPublication Date: 2018-05-24Publisher: American Physical Society (APS)Print ISSN: 0031-9007Electronic ISSN: 1079-7114Topics: PhysicsKeywords: Condensed Matter: Structure, etc.Published by: -
8Articles: DFG German National LicensesBenedetti, M. ; Prado, D. ; Martinez, N.
[S.l.] : American Institute of Physics (AIP)
Published 1991Staff ViewISSN: 1089-7623Source: AIP Digital ArchiveTopics: PhysicsElectrical Engineering, Measurement and Control TechnologyNotes: A simple, all solid-state, circuit is described that produces a square wave with variable amplitude from 0 to 1000 V and a frequency of 120 kHz into a capacitive load. The device is of application to Stark modulation in microwave and gas radical e.s.r. spectroscopy. It has certain advantages over previous systems, being more compact, excluding supply short circuits, providing an output that is automatically real zero based and being continuously variable over the range 0–1000 V, thus avoiding the need for capacitive division.Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 1475-2743Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: GeosciencesAgriculture, Forestry, Horticulture, Fishery, Domestic Science, NutritionNotes: Abstract. Land application of organic wastes can result in the accumulation of available soil phosphorus (P) and in an increase risk of eutrophication of surface and shallow groundwaters. We conducted laboratory experiments to examine the effect of waste application on the concentration of dissolved reactive phosphorus (DRP) in 1:5 soil to 0.005 m CaCl2 suspensions. Ten organic wastes, of which eight were mature composts, were applied to a P-rich Calcaric Fluvisol at rates ranging from 0 to 10% of soil by weight, and the difference in DRP concentration between suspensions containing waste and the untreated control (ΔDRP) was measured over a period of 300 days. In half of the suspensions of each waste–soil combination, 80 mg P (as KH2PO4) kg−1 soil was applied at day 14. Values of ΔDRP were generally positive, but a significant number of negative values were also recorded for some wastes and application rates, particularly at later sampling times if inorganic P had been added. Regression analyses revealed that ΔDRP (i) increased with increasing soluble reactive P at all times and (ii) increased in the short term, but decreased in the long term with increasing water soluble organic carbon in the waste. The fact that ΔDRP was sometimes negative for some waste types suggests that application of organic waste to soil does not necessarily increase eutrophication risks caused by soil P losses.Type of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesMartinez, N. ; Jones, D. G. R. ; Gutfleisch, O. ; Lavielle, D. ; Peré, D. ; Harris, I. R.
[S.l.] : American Institute of Physics (AIP)
Published 1994Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: A high-resolution scanning electron microscope was used to study the microstructural changes occurring during the desorption and recombination stages in a cast Nd14Fe79B7 alloy HDDR processed at 780 °C. Phase identification was based on backscattered electron contrast. In the early stages of desorption, the disproportionated structure in the matrix coarsens to produce a mixture of Nd-rich (NdH2 and/or Nd) and Fe-rich (αFe and/or Fe2B) clusters. At the center of the specimen, regions of recombined multicrystalline Nd2Fe14B phase are observed associated with Nd- and Fe-rich clusters. When desorption of hydrogen is almost complete, the microstructure consists of a Nd2Fe14B matrix with a few remaining Nd- and Fe-rich clusters. The subsequent completion of recombination results in a multigrained Nd2Fe14B structure, some grains being separated by Nd-rich material. The magnetic properties of the Nd14Fe79B7 alloy have been measured at significant stages during the desorption/recombination process at 600 °C, the stages being deduced from electrical resistivity measurements. Initially, the material is noncoercive with a high magnetization at 1100 kA/m, reflecting the high proportion of αFe in the sample. As recombination proceeds, the magnetization drops and the coercivity increases as the fine-grained Nd2Fe14B develops and the αFe disappears.Type of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesLopez-Martinez, N ; Gonzalez-Gutierrez, J ; De Prado, R
Oxford UK : Blackwell Science Ltd
Published 2001Staff ViewISSN: 1365-3180Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, NutritionNotes: Field resistance of Echinochloa spp. to propanil has been previously reported in Costa Rica, Colombia and Arkansas (USA). In this study, the mechanism of resistance was investigated in three resistant (R) and three susceptible (S) biotypes. The shoot fresh weight reduction in pot-grown plants from a post-emergence spray of propanil at 2.44 kg a.i. ha−1 on biotypes R/S from Costa Rica, Colombia and Arkansas was 35/98%, 25/79% and 20/82% respectively. In vitro chlorophyll fluorescence data from leaf tissue incubated in propanil showed that photosynthesis was inhibited in all biotypes, indicating that the propanil-binding site and enzyme were not altered. After transfer to herbicide-free solution, photosynthesis recovered only in resistant biotypes, indicating that the mechanism of resistance was caused by enhanced metabolism of the herbicide. Simultaneous treatment with fenitrothion, an aryl acylamidase inhibitor, prevented the recovery of photosynthesis in leaf tissue in two resistant biotypes. In contrast, the cytochrome P450 mono-oxygenase inhibitor, 1-aminobenzotriazole, did not prevent recovery from propanil in leaf tissue. Application of 14C-propanil to the second leaf of intact Echinochloa plants showed that c. 90% of the radioactivity remained in the treated leaf for up to 72 h after application. No major differences in translocation between R and S biotype plants were found. TLC analysis of tissue extracts from the treated leaves showed substantially less radioactivity associated with propanil, present after 72 h in rice or in the three R biotypes, compared with S biotypes.Type of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesStaff View
ISSN: 0082-5638Topics: ArchaeologyNotes: La Cueva del Nacimiento (Pontones): Un yacimiento neolítico en la Sierra del SeguraURL: -
13Articles: DFG German National LicensesSanz, J. L. ; Moratalla, J. J. ; Díaz-Molina, M. ; López-Martínez, N. ; Kälin, O. ; Vianey-Liaud, M.
[s.l.] : Nature Publishing Group
Published 1995Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] SIR - Beach deposits of the Arenisca de Aren Formation1 (southern Pyrenees, Maastrichtian, Upper Cretaceous) are rich in dinosaur eggs and bones, distributed over an area of about 15 km2 along the northern flank of the Tremp syncline (Fig. 1). At one locality (Bastus, Lleida) ...Type of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesStaff View
ISSN: 0022-328XSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyType of Medium: Electronic ResourceURL: -
15Articles: DFG German National LicensesStaff View
ISSN: 0040-4039Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyType of Medium: Electronic ResourceURL: -
16Articles: DFG German National LicensesStaff View
ISSN: 1572-8730Source: Springer Online Journal Archives 1860-2000Topics: MathematicsPhilosophyNotes: Abstract The Priestley duality for Wajsberg algebras is developed. The Wajsberg space is a De Morgan space endowed with a family of functions that are obtained in rather natural way. As a first application of this duality, a theorem about unicity of the structure is given.Type of Medium: Electronic ResourceURL: -
17Articles: DFG German National LicensesStaff View
ISSN: 1420-9071Keywords: Gorgonian ; antitumor agent ; cembranoid diterpene ; Pseudoplexaura porosaSource: Springer Online Journal Archives 1860-2000Topics: BiologyMedicineNotes: Abstract Two new cytotoxic antitumor diterpenoids of the cembrane class, named 14-deoxycrassin (3) and pseudoplexaurol (4), have been isolated from the Caribbean gorgonian octocoralPseudoplexaura porosa. The structure of lactone3, possessing the infrequently encountered α-methylene-δ-lactone ring, has been established from spectral and chemical data and that of alcohol4 has been established from spectral data.Type of Medium: Electronic ResourceURL: -
18Articles: DFG German National LicensesStaff View
ISSN: 1432-0789Keywords: Key words Pine barrens ; Litter ; Mycorrhizae ; Ericaceous shrub layer ; Community structureSource: Springer Online Journal Archives 1860-2000Topics: BiologyGeosciencesAgriculture, Forestry, Horticulture, Fishery, Domestic Science, NutritionNotes: Abstract We have identified the importance of ground layer ericaceous shrub density as a determinant of leaf litter patch size in upland oak/pine communities of the New Jersey pine barrens. Litter patch area is directly proportional to the number of ericaceous stems. This observation has been confirmed by experimentation where leaf litter patches accumulated under artificial stems for a period of 2 years. Leaf litter patches of different sizes contain differing proportions of leaf species. Large patches contain a significantly higher proportion of oak leaves than small patches. Difference in physical structure of large and small patches, due to leaf species composition and due to differential leaf chemistries, result in differences in soil characteristics and soil biota under the patches. Soil moisture and organic matter content of upper soil layers are greater under large litter patches than under small ones. We have preliminary evidence that these changes influence the community structure of ectomycorrhizae developing under patches of different sizes.Type of Medium: Electronic ResourceURL: -
19Articles: DFG German National LicensesStaff View
ISSN: 1573-4803Source: Springer Online Journal Archives 1860-2000Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision MechanicsNotes: Abstract A hydrogen treatment followed by calcination, has been developed in order to enhance the intrinsic coercivity of Sr-hexaferrite (SrFe12O19). Fully hydrogen-treated Sr-hexaferrite consists of a mixture of 73%, by weight, of αFe and 27% of Sr7Fe10O22 phases. Calcination of this material to reform the SrFe12O19 phase occurs in two stages. Between room temperature and 600°C, oxygen was absorbed resulting in a large increase in weight with the formation of a mixture of SrFeO3−x and Fe2O3(α and γ). During the second stage, the intermediate phases reacted to form SrFe12O19 at a temperature of between 700 and 800°C. A partial desorption of oxygen occurred until calcination reached completion at 1000°C. The magnetization at 1100 kA m−1 and the remanence were similar to those of the untreated material, but, because of a much refined grain size, the intrinsic coercivity was considerably larger, with values around 400 kA m−1. Grain growth occurs at temperatures 〉 1000°C, resulting in a decrease in the intrinsic coercivity.Type of Medium: Electronic ResourceURL: -
20Articles: DFG German National LicensesStaff View
ISSN: 1573-7055Keywords: Muridae ; skull ; dentition ; phylogenetic analysis ; mosaic evolutionSource: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Abstract The cranial morphology of the extinct murid genus Stephanomys, previously known only by dental remains, is described here on the basis of partial skulls of three species of Pliocene age. Important cranial characters of the genus are a robust rostrum, a high zygoma, a wide zygomatic arch, a narrow interorbit, a large orbit, and an optic foramen in the backward position. In addition to some dental characters, Stephanomys shares most of these cranial traits with the extinct Malpaisomys from the Canary Islands. Some of these traits may be linked to the development of large eyes and life in a rocky environment. The peculiar dental pattern of Stephanomys (stephanodonty) is also present in some recent murids (Oenomys and Thamnomys) having a different skull morphology. A comparison with nine other extant genera of murids verified the relationship among Malpaisomys, Stephanomys, and Acomys, supporting our previous conclusion. Phenetic and cladistic analyses of 17 cranial and 23 dental characters show that skull morphology is phylogenetically informative but highly convergent and incongruent with other partial evidence based on dental and biochemical characters. The combined analyses of skull and teeth illustrate a case of mosaic evolution in murids.Type of Medium: Electronic ResourceURL: