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41.
Amino-acid sequence of slightly lysine-rich histone 总被引:16,自引:0,他引:16
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ZHANG Hongfu Eizo Nakamura ZHANG Jin Ishikawa Akira 《科学通报(英文版)》2006,51(15):1869-1876
Melt inclusions or glasses usually occur in spinel- facies peridotitic xenoliths entrained in the global ba- salts[1―4], and olivine phenocrysts and/or xenocrysts carried in the intermediate-mafic volcanic rocks (such as basalts, basaltic andesites and h… 相似文献
44.
H. Haraguchi H. Ishikawa S. Sakai B. -P. Ying I. Kubo 《Cellular and molecular life sciences : CMLS》1996,52(6):573-576
A diterpenoid, totarol (1), fromPodocarpus nagi was evaluated as an antioxidant. This diterpenoid inhibited autoxidation of linoleic acid. Mitochondrial and microsomal lipid peroxidation induced by Fe(III)-ADP/NADH or Fe(III)-ADP/NADPH were also inhibited. Nagilactone E (2), a norditerpene lactone isolated from the same source, had no antioxidative activity. Furthermore, totarol protected red cells against oxidative hemolysis. This diterpene was shown to be effective in protecting biological systems against oxidative stresses. 相似文献
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The STING pathway and regulation of innate immune signaling in response to DNA pathogens 总被引:1,自引:1,他引:0
The innate immune system has evolved a variety of sensing mechanisms to detect and counter microbial invasion. These include
the Toll-like receptor (TLR), cytoplasmic, nucleotide binding oligomerization domain (NOD)-like receptor and RIG-I-like helicase
(RLH) pathways. However, how the cell detects pathogen-associated DNA to trigger host defense, including the production of
interferon, remains to be fully clarified. Understanding these processes could have profound implications into how we understand
and treat a variety of microbial-related disease, including viral-associated cancers, as well as autoimmune disorders. Recently,
an endoplasmic reticulum-associated molecule referred to as STING (for stimulator of interferon genes) was isolated and shown
to be critical for regulating the production of IFN in response to cytoplasmic DNA. Here, we review recent discoveries relating
to the detection of foreign DNA, including the importance of the STING and inflammasome pathways and the triggering of innate
signaling processes. 相似文献
47.
M. Okuno T. Nakanishi Y. Shinomura T. Kiyohara H. Ishikawa S. Tarui 《Cellular and molecular life sciences : CMLS》1992,48(1):47-50
Peptide YY (PYY) is thought to possess paracrine and endocrine functions. The highest concentrations of this peptide are in the colonic mucosa. The effect of PYY on electrolyte and water transport in the rat colon was studied in vivo. Under urethane anesthesia, rat colonic loops were perfused at a constant rate with physiological buffer solution containing phenol red as a nonabsorbable volume marker, and net movements of water, sodium, chloride and potassium in the perfused colon were determined every 10 min. Intravenous administration of PYY produced a dose-dependent increase in the net absorption of sodium chloride and water, as well as a decrease in the net secretion of potassium. PYY inhibited the reduction in net absorption of sodium chloride and water evoked by vasoactive intestinal peptide (VIP), but did not affect the VIP-evoked increase in net potassium secretion.These findings suggest that PYY acts as an enhancer of sodium chloride and water absorption and as an antagonist to VIP-induced secretion in the colon. 相似文献
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Sulfur is an advantageous material as a promising next-generation positive electrode material for high-energy lithium batteries due to a high theoretical capacity of 1672 m A h g 1although its discharge potential is somewhat modest:ca.2 V vs Li/Lit.However,a sulfur positive electrode has some crucial problems for practical use,which are mainly attributed to the dissolution of its intermediate products in charge–discharge processes.In order to resolve the dissolution problem of lithium polysulfide,we attempted to synthesize a sulfur–microporous activated carbon(AC) composite positive electrode.Moreover,we have systematically researched the battery performance of sulfur–microporous AC positive electrode with variations of electrolytes as well as negative electrodes,and found its promising positive electrode performance for a nextgeneration rechargeable battery. 相似文献
50.
Understanding the transmission of sensory information at individual synaptic connections requires knowledge of the properties of presynaptic terminals and their patterns of firing evoked by sensory stimuli. Such information has been difficult to obtain because of the small size and inaccessibility of nerve terminals in the central nervous system. Here we show, by making direct patch-clamp recordings in vivo from cerebellar mossy fibre boutons-the primary source of synaptic input to the cerebellar cortex-that sensory stimulation can produce bursts of spikes in single boutons at very high instantaneous firing frequencies (more than 700 Hz). We show that the mossy fibre-granule cell synapse exhibits high-fidelity transmission at these frequencies, indicating that the rapid burst of excitatory postsynaptic currents underlying the sensory-evoked response of granule cells can be driven by such a presynaptic spike burst. We also demonstrate that a single mossy fibre can trigger action potential bursts in granule cells in vitro when driven with in vivo firing patterns. These findings suggest that the relay from mossy fibre to granule cell can act in a 'detonator' fashion, such that a single presynaptic afferent may be sufficient to transmit the sensory message. This endows the cerebellar mossy fibre system with remarkable sensitivity and high fidelity in the transmission of sensory information. 相似文献