53 research outputs found

    Serum Concentration of Myosin Light Chain I and Left Ventricular Shortening Fraction in Neonates

    Get PDF
    We compared the serum concentrations of myosin light chain I (MLC-I) and left ventricular shortening fraction (LVSF) measured by echocardiography of 13 normal neonates with those of 38 neonates with fetal distress, neonatal asphyxia, or cardiovascular/respiratory diseases not associated with structural abnormalities. The diseased group included 9 neonates with elevated MLC-I concentrations and 18 with low LVSF. Elevated MLC-I concentrations were frequently noted in neonates with transient myocardial ischemia and persistent pulmonary hypertension of the newborn, suggesting a high specificity of MLC-I elevation in these diseases. Although echocardiographically determined LVSF identifies the affected sections of the myocardium, it did not allow rating of the severity of the disorder. There was no correlation between MLC-I and LVSF probably due to therapeutic interventions and pulmonary hypertension. Our results suggest that MLC-I is a useful marker of neonatal myocardial diseases

    Operational Review of the First Wireline In Situ Stress Test in Scientific Ocean Drilling

    Get PDF
    Scientific ocean drilling’s first in situ stress measurement was made at Site C0009A during Integrated Ocean Drilling Program (IODP) Expedition 319 as part of Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) Stage 2. The Modular Formation Dynamics Tester (MDT, Schlumberger)wireline logging tool was deployed in riser Hole C0009A to measure in situ formation pore pressure, formation permeability (often reported as mobility=permeability/viscosity), and the least principal stress (S3) at several isolated depths (Saffer et al., 2009; Expedition 319 Scientists, 2010). The importance of in situ stress measurements is not only for scientific interests in active tectonic drilling, but also for geomechanical and well bore stability analyses. Certain in situ tools were not previously available for scientific ocean drilling due to the borehole diameter and open hole limits of riserless drilling. The riser-capable drillship, D/V Chikyu,now in service for IODP expeditions, allows all of the techniques available to estimate the magnitudes and orientations of 3-D stresses to be used. These techniques include downhole density logging for vertical stress, breakout and caliper log analyses for maximum horizontal stress, core-based anelastic strain recovery (ASR, used in the NanTroSEIZE expeditions in 2007–2008), and leak-off test (Lin et al., 2008) and minifrac/hydraulic fracturing (NanTroSEIZE Expedition319 in 2009). In this report, the whole operational planning process related to in situ measurements is reviewed, and lessons learned from Expedition 319 are summarized for efficient planning and testing in the future

    「ちきゅう」10年の成果

    No full text
    corecore