Chemonucleolysis in the herniated L3-L4 disk HOFSTRA, L; VAN WOERDEN, H. H; DEUTMAN, R
Clinical orthopaedics and related research,
08/1991, Letnik:
269, Številka:
269
Journal Article
Recenzirano
In a continuous series of 770 patients with a herniated disk treated by chemonucleolysis, 16 patients had herniation of the L3-L4 disk (2.1%). There were no complications, and none of these 16 ...patients had open surgery after the initial treatment. A follow-up study was performed after 39 months (range, six to 80 months) in 15 patients. Three patients were for the most part satisfied and 12 patients were fully satisfied with the result of treatment. Residual pain was minor in most patients. Roentgenographic signs of increased disk degeneration were seen in six patients, and reexpansion of the disk to some degree was noted in four patients. Chemonucleolysis is effective for treatment of the herniated L3-L4 disk.
Q fever outbreak in industrial setting van Woerden, Hugo C; Mason, Brendan W; Nehaul, Lika K ...
Emerging infectious diseases,
07/2004, Letnik:
10, Številka:
7
Journal Article
Recenzirano
Odprti dostop
An outbreak of Q fever occurred in South Wales, United Kingdom, from July 15 through September 30, 2002. To investigate the outbreak a cohort and nested case-control study of persons who had worked ...at a cardboard manufacturing plant was conducted. The cohort included 282 employees and subcontractors, of whom 253 (90%) provided blood samples and 214 (76%) completed questionnaires. Ninety-five cases of acute Q fever were identified. The epidemic curve and other data suggested an outbreak source likely occurred August 5-9, 2002. Employees in the factory's offices were at greatest risk for infection (odds ratio 3.46; 95% confidence interval 1.38-9.06). The offices were undergoing renovation work around the time of likely exposure and contained straw board that had repeatedly been drilled. The outbreak may have been caused by aerosolization of Coxiella burnetii spore-like forms during drilling into contaminated straw board.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, ODKLJ, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Results of the mapping of the blue gas-rich S0 galaxy NGC 5102 in the 21-cm H I line with a spatial resolution of 34 x 37 arcsec (delta(alpha) x Delta(delta)) and a velocity resolution of 12 km/s are ...presented. The H I distribution has a pronounced central depression of 1.9 kpc radius, and most of the H I is concentrated in a 3.6 kpc wide ring with an average radius of 3.7 kpc, assuming a distance of 4 Mpc for NGC 5102. The maximum azimuthally averaged H I surface density in the ring is 1.4 solar mass/sq pc, comparable to that found in other S0 galaxies. The HI velocity field is quite regular, showing no evidence for large-scale deviations from circular rotation, and the H I is found to rotate in the plane of the stellar disk. Both the H I mass/blue luminosity ratio and the radial H I distribution are similar to those in early-type spirals. The H I may be an old disk or it may have been acquired through capture of a gas-rich smaller galaxy. The recent starburst in the nuclear region, which gave the galaxy its blue color, may have been caused by partial radial collapse of the gas disk, or by infall of a gas-rich dwarf galaxy.
We present optical absorption spectroscopy of the Ca II K and H lines along the sight line to the quasar PKS 0837 – 120, which lies in the direction of a high-velocity cloud (HVC) detected in H I ...21-cm emission at ${V}_\text{LSR}=+105 \,\text{km} \,\text{s}^{-1}$. Our data show Ca II absorption due to the HVC as well as a lower velocity interstellar component. This is the fifth case in which optical absorption lines due to heavy dements in an HVC have been reported. We also give results of additional radio observations of the HVC. The column density ratio N(Ca II)/N(H I) for the HVC is $\sim 1.6 \times {10}^{-7}$, with an uncertainty of approximately a factor of 2. This calcium abundance is approximately one tenth the solar ratio of Ca/H, and higher than the level of Ca II found in the other detections of this species in an HVC. Thus the gas in the HVC towards PKS 0837–120 has undergone considerable heavy element enrichment and little depletion of Ca on to grains. These facts might suggest an origin for the HVC such as the sweeping up of interstellar material by a supernova explosion; however, they would also be consistent with other origins such as a galactic fountain, infall of intergalactic gas, shreds of a warped disc, or tidal debris from the Magellanic Clouds.
NGC 1023, one of the few gas-rich lenticular galaxies known to date, has been observed with the Westerbork Synthesis Radio Telescope. The hydrogen, amounting to $1.5 \times 10^9 M_\odot$, has ...remarkable density distribution and kinematics, suggesting probably an intergalactic origin and recent arrival. The presence of an H I cloud in the region to the north-east of NGC 1023, reported by Hart, Davies & Johnson (1980), is confirmed but it seems to be part of the H I complex associated with NGC 1023, rather than an isolated intergalactic cloud. The structure of H I around NGC 1023 appears irregular and clumpy. One of the densest H I clumps is associated with the small optical companion visible near the eastern edge of NGC 1023. The gas kinematics are quite complex; overall rotation is in evidence, but the presence over a large area of double-peaked velocity profiles indicates that at least part of the gas surrounding NGC 1023 must have systematic non-circular motions of order 100 km s−1. The observed H I density distribution and kinematics are reminiscent of the tails and bridges found in interacting multiple systems of galaxies, and may have originated, in a similar way, from an encounter of NGC 1023 with one or more late-type hydrogen-rich systems. In this picture the latter would be tidally disrupted and would eventually merge with NGC 1023. In addition to the Eastern companion, two other dwarf-like systems have been detected in H I in the neighbourhood of NGC 1023, one 19 arcmin to the north and the other 10 arcmin to the south.
A study of the Type II-P supernova 2003gd in M74 Hendry, M. A.; Smartt, S. J.; Maund, J. R. ...
Monthly notices of the Royal Astronomical Society,
05/2005, Letnik:
359, Številka:
3
Journal Article
The spindle-like galaxies UGC 7576 and II Zw 73 Schechter, Paul L.; Sancisi, R.; van Woerden, Hugo ...
Monthly notices of the Royal Astronomical Society,
05/1984, Letnik:
208, Številka:
1
Journal Article
Recenzirano
Odprti dostop
We have mapped the spindle-like galaxies UGC 7576 and II Zw 73 in the 21-cm line of neutral hydrogen. In both systems the projected H I distribution coincides almost perfectly with the projected ...light distribution of the outer optical component. The velocity fields in both objects support the identification of the outer components as differentially rotating annuli seen edge-on. The hydrogen mass – optical luminosity ratios in these components are exceptionally large. The annuli exhibit little or no evidence of differential precession, yet the time-scales for this process (granting reasonable assumptions about the shapes of the gravitational potentials) are relatively short. The annuli therefore appear to have formed in the relatively recent past.
CT myelographic data in 80 patients with clinical evidence of nerve-root involvement or long tract signs attributed to degenerative disorders of the cervical spine were classed into five diagnostic ...groups, and their clinical significance was assessed. Unilateral flattening of the cord by a spondylotic mass or bulging disk in a normally wide canal (group 1) was considered nonspecific because nerve-root signs were nearly as often contralateral as unilateral to the radiologic findings, and none of the patients had long tract signs. As a rule, conventional myelography showed only minor root-sleeve deformity. Concentric compression of the cord in a narrow (stenotic) canal (group 2) proved to produce long tract signs only after the cross-sectional area of the cord had been reduced by about 30% to a value of about 60 mm
2
or less. In most cases, nerve-root swelling (group 3) coincided with the side of nerve-root symptoms. A 100% correlation was found between the side of disk herniation with occlusion of the corresponding foramen (group 4) and the side of nerve-root symptoms. In 24 patients, cord and nerve roots showed no abnormalities (group 5). If stenosis of the spinal canal, nerve root swelling, and disk herniation are considered specific CT myelographic signs in nerve-root symptomatology, a specific diagnosis could be made in about 40% of the cases.
Three systems are described for chest radiograph scoring in cystic fibrosis patients: the Shwachman-Kulczycki, the Chrispin-Norman and the Brasfield method. Sixty chest radiographs of 39 patients of ...different ages have been independently scored by two radiologists according to the three methods. No statistical differences between the methods could be demonstrated. The Chrispin-Norman method is recommended as the best choice because differences in scoring appeared better interpretable. A significant increase in precision could be achieved by combining the scores of the three methods.
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