6,022 research outputs found
Evidence of neuroaxonal degeneration in myofascial pain syndrome: a study a neuromuscular jitter by axonal microstimulation.
No full textWood smoke extract induces oxidative stress-mediated caspase-independent apoptosis in human lung endothelial cells: role of AIF and EndoG
No full textEffect of pericarp structure of Camptotheca acuminata fruit on the seed germination and storage.
No full textImprovements to bit line contact processing in trench DRAM
No full text[[abstract]]Ionized physical vapor deposition of titanium and titanium nitride contact metal was investigated to assess whether adding extra nitrogen into the chamber reduced contact current leakage and whether lowering the RF bias power would reduce ion bombardment. The results of multiple analyses confirm that plasma deposition with extra nitrogen can suppress the accumulation of Ti atoms and, therefore, the formation of TiSi(x), and that lowering the RF power can reduce the ratio of resputtering and decrease the thickness of the Ti layer. The two techniques can be effectively implemented in bit line contact processing to reduce current leakage while improving product performance and reliability. (C) 2011 American Vacuum Society. [DOI: 10.1116/1.3653967][[note]]SC
Seabed foraging by Antarctic krill: Implications for stock assessment, bentho-pelagic coupling, and the vertical transfer of iron
No full textA compilation of more than 30 studies shows that adult Antarctic krill (Euphausia superba) may frequent benthic habitats year-round, in shelf as well as oceanic waters and throughout their circumpolar range. Net and acoustic data from the Scotia Sea show that in summer 2-20% of the population reside at depths between 200 and 2000 m, and that large aggregations can form above the seabed. Local differences in the vertical distribution of krill indicate that reduced feeding success in surface waters, either due to predator encounter or food shortage, might initiate such deep migrations and results in benthic feeding. Fatty acid and microscopic analyses of stomach content confirm two different foraging habitats for Antarctic krill: the upper ocean, where fresh phytoplankton is the main food source, and deeper water or the seabed, where detritus and copepods are consumed. Krill caught in upper waters retain signals of benthic feeding, suggesting frequent and dynamic exchange between surface and seabed. Krill contained up to 260 nmol iron per stomach when returning from seabed feeding. About 5% of this iron is labile, i.e., potentially available to phytoplankton. Due to their large biomass, frequent benthic feeding, and acidic digestion of particulate iron, krill might facilitate an input of new iron to Southern Ocean surface waters. Deep migrations and foraging at the seabed are significant parts of krill ecology, and the vertical fluxes involved in this behavior are important for the coupling of benthic and pelagic food webs and their elemental repositories
Identification of an alkylhydroquinone from Rhus succedanea as an inhibitor of tyrosinase and melanogenesis
No full text
The abrupt climate change near 4,400 yr BP on the cultural transition in Yuchisi, China and its global linkage
No full textExtreme climatic events have profound impacts on human society. Here we present the results of a study of organic biomarkers within a sedimentary section at the archaeological site of Yuchisi, eastern China, in order to reconstruct climatic variability during the Dawenkou (5,050-4,400 yr BP) and Longshan (4,400-4,000 yr BP) cultures. At similar to 4,400 yr BP, within the cultural transition horizon, abrupt changes in biomarkers, such as the fatty acid ratio C-18:2/C-18:0, 2C(31)/(C-27 + C-29), n-C-18-ol and n-C-30-ol, indicate the occurrence of local climate changes over the course of a few decades. These changes occurred during the transition from the Holocene warm period to a subsequent cold period which lasted for the following 600 years. This climatic shift has been recorded at numerous sites worldwide, and it is likely to have been the main cause of the widespread collapse of many isolated cultures at that time. The palaeoclimatic and archaeological data from the Yuchisi sediments may provide new insights into the relationship between climate change and prehistoric cultural transitions
Holt-Oram syndrome with right lung agenesis caused by a de novo mutation in the TBX5 gene
No full textCryopreserved oocytes of infertile couples undergoing assisted reproductive technology could be an important source of oocyte donation: A clinical report of successful
No full text- …
