793 research outputs found
A spontaneous strangulated transomental hernia: Prospective and retrospective multi-detector computed tomography findings.
No full textScintimammography with technetium-99m tetrofosmin in the diagnosis of breast cancer and lymph node metastases
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Full and ideal mixing behavior between Zr-Wd (K2ZrSi3O9) and Ti-Wd (K2TiSi3O9): evidences from mineral chemistry, X-ray diffraction pattern and Raman spectrum
No full textA series of wadeite solid solutions (Wd(ss)) along the join K2ZrSi3O9 (Zr-wadeite, Zr-Wd)-K2TiSi3O9 (Ti-wadeite, Ti-Wd) was synthesized at 2 GPa and 1,200-1,400 A degrees C for 24 h with a piston-cylinder apparatus. The chemical composition data demonstrated that Ti and Zr readily substitute for each other, and a full series of Wd(ss) exists between the Zr-Wd and Ti-Wd end-members at the P-T conditions of our synthesizing experiments. The volume-composition relationship at ambient P-T conditions did not show any significant deviation from the Vegard's law, indicating a nearly ideal mixing between the Zr-Wd and Ti-Wd. All the Raman peaks observed at ambient P-T conditions were linearly correlated with the composition, suggesting an almost full structural relaxation for the Wd(ss). These findings suggest that the complete mixing behavior along the join K2ZrSi3O9-K2TiSi3O9, as demonstrated by our high-P experiments, may extend to a much wider range of P-T conditions. Consequently, the coexistence of the Zr-Wd and Ti-Wd in the lamproites from the Leucite Hills, Wyoming, may be due to a chemical composition change of the magma rather than a crystal structural limit.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000350310900006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Materials Science, MultidisciplinaryMineralogySCI(E)[email protected]
Effect of Biochar and Wood Distillate Application on Vegeto-Productive Performances of Strawberry Plants (cv. Charlotte) Under Controlled Conditions
No full textStrawberry [Fragaria × ananassa (Weston) Rozier] cultivation is increasingly shifting toward soilless systems due to soilborne disease pressures and sustainability concerns. Peat, the traditional substrate of choice, faces ecological and economic challenges, driving the search for alternative materials. Biochar, a carbon-rich byproduct of biomass pyrolysis, offers benefits such as enhanced water retention and nutrient dynamics, while wood distillate (WD), a secondary pyrolysis product, functions as a biostimulant promoting plant growth and stress resilience. This study evaluated the effects of biochar (0, 2% and 4% wt/wt) and WD (0, 2.5 mL/L, 5 mL/L and 10 mL/L on the substrate and 3 mL on the leaves) on soilless strawberry cultivation. Biochar had minimal impact during early growth but improved plant height, root length, and leaf area at harvest, particularly at higher concentrations, while at lowest doses, fruit yield and most quality parameters were unaffected, with slight improvements in colour and soluble solids. WD treatments, especially at 2.5 and 5 mL/L, enhanced several morphological and physiological traits. While neither amendment significantly increased yield or bioactive compound accumulation, both demonstrated potential to improve plant vigour and fruit quality. These findings support the use of biochar and WD as sustainable inputs in resource-efficient, climate-resilient strawberry production systems
Resting state cortical EEG rhythms in Alzheimer's disease: toward EEG markers for clinical applications: a review
No full textThe human brain contains an intricate network of about 100 billion neurons. Aging of the brain is characterized by a combination of synaptic pruning, loss of cortico-cortical connections, and neuronal apoptosis that provoke an age-dependent decline of cognitive functions. Neural/synaptic redundancy and plastic remodeling of brain networking, also secondary to mental and physical training, promote maintenance of brain activity and cognitive status in healthy elderly subjects for everyday life. However, age is the main risk factor for neurodegenerative disorders such as Alzheimer's disease (AD) that impact on cognition. Growing evidence supports the idea that AD targets specific and functionally connected neuronal networks and that oscillatory electromagnetic brain activity might be a hallmark of the disease. In this line, digital electroencephalography (EEG) allows noninvasive analysis of cortical neuronal synchronization, as revealed by resting state brain rhythms. This review provides an overview of the studies on resting state eyes-closed EEG rhythms recorded in amnesic mild cognitive impairment (MCI) and AD subjects. Several studies support the idea that spectral markers of these EEG rhythms, such as power density, spectral coherence, and other quantitative features, differ among normal elderly, MCI, and AD subjects, at least at group level. Regarding the classification of these subjects at individual level, the most previous studies showed a moderate accuracy (70-80%) in the classification of EEG markers relative to normal and AD subjects. In conclusion, resting state EEG makers are promising for large-scale, low-cost, fully noninvasive screening of elderly subjects at risk of AD
Accretion onto WD 2226-210, the central star of the Helix Nebula
No full textThe central star of the Helix Nebula, WD 2226210 presents enigmatic hard X-ray emission and mid-IR excess. The latter has been attributed to a dusty disc or a cloud-like structure around WD 2226210 formed from material of Kuiper Belt-like or comet-like objects in highly eccentric orbits. We present here a detailed analysis of multi-epoch Chandra and XMM-Newton X-ray observations of WD 2226210, comparing these to previous Einstein and ROSAT data. The luminosity of the hard X-ray component of WD 2226210 has remained basically constant in the decade from 1992 to 2002, with very subtle evidence for variability in time-scales of hours. Under the assumption that the X-ray emission from WD 2226210 is due to accretion of material, an accretion rate of M yr is estimated. The origin of the material accreted by WD 2226210 is uncertain, and can be attributed to the disc-like structure around it or to a substellar donor companion. The accretion rate proposed for the continuous replenishment by bombardment of the mid-IR-emitting structure around WD 2226210 cannot match that required by the X-ray emission. © 2024 The Author(s).The authors thank comments and suggestions from an anonymous
referee that helped improving the presentation and discussion of our
results.
SE-D thanks support to CONACyT-Mexico for a student grant.
JAT acknowledges support from UNAM PAPIIT project IN102324.
MAG acknowledges financial support from grants CEX2021-
001131-S funded by MCIN/AEI/10.13039/501100011033 and
PID2022-142925NB-I00 from the Spanish Ministerio de Ciencia,
Innovacion´ y Universidades (MCIU) cofunded with FEDER funds.
RFM acknowledges support from the Programa de Becas posdoctorales of the Direccion´ General de Asuntos del Personal Academico ´ of
the Universidad Nacional Autonoma ´ de Mexico ´ (DGAPA, UNAM,
Mexico). Y-HC acknowledges the support of the grant NSTC112-
2112-M-001-065 from the National Science and Technology Council
of Taiwan. This work is based on observations obtained with XMM–
Newton, an European Science Agency (ESA) science mission with
instruments and contributions directly funded by ESA Member States
and NASA. This research has made use of data obtained from the
Chandra Data Archive and software provided by the Chandra X-ray
Center (CXC) in the application packages CIAO. This work has made
extensive use of NASA’s Astrophysics Data System.With funding from the Spanish government through the "Severo Ochoa Centre of Excellence" accreditation (CEX2021-001131-S).Peer reviewe
The prion-like protein doppel (Dpl) interacts with the human receptor for activated C-Kinase 1 (RACK1) Protein
No full textBACKGROUND: Doppel (Dpl) is a homologue of the prion protein (PrPC). In contrast to PrP(C), Dpl is dispensable for prion disease, but appears to have an essential function in male spermatogenesis. Recently, Dpl has been found to be aberrantly expressed in astrocytic and leukaemic tumor specimens, showing a peculiar cytosolic cellular localization. The aim of this study was to clarify some of the putative Dpl interacting proteins. MATERIALS AND METHODS: A yeast two hybrid system was employed and the results were verified by co-immunoprecipitation using transfected cells. RESULTS: Several potential Dpl-binding candidates were identified and, among them, the receptor for activated C-kinase (RACK1) protein was further investigated. RACK1 deletion mutants showed that some of its WD containing domains were directly involved in the binding with Dpl. Our data showed that Dpl interacts with RACK1 by means of its structured globular carboxyl-terminal region. CONCLUSION: This new Dpl interacting partner might suggest functional hypotheses about the role of this protein in an astrocytoma context where Dpl was found ectopically expressed
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