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31.
Lj. Mihailović 《Cellular and molecular life sciences : CMLS》1959,15(3):119-120
Résumé Par la stimulation électrique adéquate des noyaux thalamiques intralaminaires (N. anterior, N. medialis dorsalis) chez les singes non anesthésiés portant les électrodes à demeure, il a été possible de contrôler le rythme des décharges cloniques de deux foyers corticaux indépendants, de synchroniser leur activité et de prolonger la séquence clonique des décharges dépassant sa durée intrinsèque. 相似文献
32.
Lj. Grlić 《Cellular and molecular life sciences : CMLS》1956,12(6):230-231
Résumé Les résultats des dosages parallèles d'acide ascorbique et de carotène dans les feuilles des espèces appartenant à 7 familles ont démontré une tendance à la stabilité de la proportion acide ascorbique/carotène chez les plantes apparentées. La stabilité de cette proportion chez les espèces d'une seule famille est plus marquée que celle de la teneur même des deux substances. Ce fait semble pouvoir confirmer l'idée d'une correlation étroite dans l'action des deux substances en question. 相似文献
33.
34.
Li Y Balédent V Yu G Barišić N Hradil K Mole RA Sidis Y Steffens P Zhao X Bourges P Greven M 《Nature》2010,468(7321):283-285
The elucidation of the pseudogap phenomenon of the high-transition-temperature (high-T(c)) copper oxides-a set of anomalous physical properties below the characteristic temperature T* and above T(c)-has been a major challenge in condensed matter physics for the past two decades. Following initial indications of broken time-reversal symmetry in photoemission experiments, recent polarized neutron diffraction work demonstrated the universal existence of an unusual magnetic order below T* (refs 3, 4). These findings have the profound implication that the pseudogap regime constitutes a genuine new phase of matter rather than a mere crossover phenomenon. They are furthermore consistent with a particular type of order involving circulating orbital currents, and with the notion that the phase diagram is controlled by a quantum critical point. Here we report inelastic neutron scattering results for HgBa(2)CuO(4+δ) that reveal a fundamental collective magnetic mode associated with the unusual order, and which further support this picture. The mode's intensity rises below the same temperature T* and its dispersion is weak, as expected for an Ising-like order parameter. Its energy of 52-56?meV renders it a new candidate for the hitherto unexplained ubiquitous electron-boson coupling features observed in spectroscopic studies. 相似文献
35.
Li Y Balédent V Barisić N Cho Y Fauqué B Sidis Y Yu G Zhao X Bourges P Greven M 《Nature》2008,455(7211):372-375
The pseudogap region of the phase diagram is an important unsolved puzzle in the field of high-transition-temperature (high-T(c)) superconductivity, characterized by anomalous physical properties. There are open questions about the number of distinct phases and the possible presence of a quantum-critical point underneath the superconducting dome. The picture has remained unclear because there has not been conclusive evidence for a new type of order. Neutron scattering measurements for YBa(2)Cu(3)O(6+delta) (YBCO) resulted in contradictory claims of no and weak magnetic order, and the interpretation of muon spin relaxation measurements on YBCO and of circularly polarized photoemission experiments on Bi(2)Sr(2)CaCu(2)O(8+delta)(refs 12, 13) has been controversial. Here we use polarized neutron diffraction to demonstrate for the model superconductor HgBa(2)CuO(4+delta) (Hg1201) that the characteristic temperature T* marks the onset of an unusual magnetic order. Together with recent results for YBCO, this observation constitutes a demonstration of the universal existence of such a state. The findings appear to rule out theories that regard T* as a crossover temperature rather than a phase transition temperature. Instead, they are consistent with a variant of previously proposed charge-current-loop order that involves apical oxygen orbitals, and with the notion that many of the unusual properties arise from the presence of a quantum-critical point. 相似文献
36.
P. J. Islip M. V. Bogunović-Batchelor 《Cellular and molecular life sciences : CMLS》1985,41(10):1353-1354
Summary The synthesis and antischistosome properties of 5-(hydroxyimino)-4-methoxy-2-(pivaloylimino)thiazolidine-3-acetamide (1) are described. The compound was prepared by reduction of the nitrothiazoline (2) with stannous chloride in methanol, and represents the first example of a reduced nitroheterocyclic compound showing potent schistosomicidal properties. The possible relationship of compounds such as1 to the as yet unidentified reduced active but toxic entities formed in vivo from nitroheterocyclics like metronidazole is discussed.Acknowledgments. The authors are grateful to Dr A. J. Everett and his staff for the physical chemistry measurements, and to Mr G. Dickerson for the antischistosome testing. 相似文献
37.
R. V. Živković B. B. Mršulja B. M. Djurčić 《Cellular and molecular life sciences : CMLS》1975,31(4):404-406
Résumé Le cervelet contient des quantités plus grandes d'ATP, d'ADP et de nucléotides totaux que le lobe frontal du cerveau ou la moelle cervicale. Ces différences ne sont pas trouvées avec l'AMP. Le contenu en glycogène, en glucose et en lactate est plus grand dans la moelle cervicale que dans le cervelet et dans le lobe frontal.
We wish to thank Dr.H. Rehkämper from Boehringer Mannheim GmbH, who kindly supplied us with all the enzymes, substrates and cofactors. 相似文献
We wish to thank Dr.H. Rehkämper from Boehringer Mannheim GmbH, who kindly supplied us with all the enzymes, substrates and cofactors. 相似文献
38.
O. Carević V. Šverko M. Boranić V. Prpić 《Cellular and molecular life sciences : CMLS》1974,30(3):241-242
Zusammenfassung Nachweis, dass Ftorafur, N1-(2-Furanidyl)-5-Fluorouracil das Überleben leukämischer Mäuse deutlich steigert und ausserdem als Lysosomen-Stabilisator wirken könnte, wobei die in vivo Stabilisierung der Lysosomen den antileukämischen Effekt dieses Zytostatikums unterstützen könnte. 相似文献
39.
P. N. Martinovitch D. Pavić N. Živković 《Cellular and molecular life sciences : CMLS》1980,36(2):204-205
Summary The parabiotic union of a b/b rat, suffering from a red blood cell anemia, with a normal partner will restore to normal the functioning of this type of blood cell. The effect of parabiotic union is evident for several weeks following the separation of the parabiotic partners. It would be logical to conclude that the normal partner supplies a factor absent in the anemic animal needed for normal functioning of the red cell. 相似文献
40.
Ž. Bradamante A. Pećina-Hrnčević I. Ciglar 《Cellular and molecular life sciences : CMLS》1980,36(10):1210-1211
Summary Scarce and randomly oriented oxytalan fibres are present in the connective tissue of dental pulp in both deciduous and permanent teeth.This investigation was supported by grant No.V-10/78 from the SIZ-V of S. R. Croatia. 相似文献