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  • 1
    Electronic Resource
    Electronic Resource
    Theoretical calculation of hydrogen molecule in silicon (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 3222-3225 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: First principle quantum chemical calculations have been performed on a hydrogen molecule in the silicon crystal using the cluster model of Si10H16. The ab initio molecular orbital theory and the density functional theory (DFT) calculations have been examined. In all calculations, the tetrahedral site is the most stable trapping site for the hydrogen molecule. The DFT calculations with generalized gradient approximation show that the bond length of H2 in the silicon crystal is comparable to that of gaseous H2. The calculated vibrational frequency of H2 in the silicon crystal agrees well with the experimental value obtained by Murakami et al. [Phys. Rev. Lett. 77, 3161 (1996)]. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475718
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  • 2
    Electronic Resource
    Electronic Resource
    The influence of some demographic and clinical variables on psychosomatic traits of patients requesting replacement removable partial dentures (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 25 (1998), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: SUMMARY The purpose of this study was to investigate the influence of some demographic and clinical variables on psychosomatic traits of the patients who visited the prosthodontic section of the Dental Hospital at Tokyo Medical and Dental University for replacement of their removable partial dentures (RPDs). Sixty-six patients with 50 maxillary and 44 mandibular RPDs completed the psychological measurements concerning their dentures using visual analogue scales (VAS). Female patients rated significantly lower satisfaction with the comfort of their dentures than males. Younger patients expressed less satisfaction with the aesthetics of their dentures than the older patients. The period of wearing the present denture significantly correlated with psychological measures of pain, comfort, and general satisfaction, suggesting that this clinical variable may be an important factor. There was no significant correlation between the patients’ general satisfaction with dentures and the retention/stability scores assessed by the examiner.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.1998.00264.x
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  • 3
    Electronic Resource
    Electronic Resource
    A simple technique for correction of complicated tibial deformity including rotational deformity (1998)
    Springer
    Archives of orthopaedic and trauma surgery 117 (1998), S. 259-261 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Although the simplest way to correct bone deformity is one-stage correction, the problem associated with that method is overstretching of the soft tissues, which limits the correction and leads to complications such as compartment syndrome or peripheral nerve palsy. If an adequate amount of tissue necessary for correction is formed in advance, the deformity can be corrected safely at one stage without overstretching of the tissues. A leg lengthening technique was employed to form the necessary tissues. After leg lengthening with an unilateral external fixator (Hifixator), deformities were corrected manually at one stage without anesthesia, and the corrected positions were again secured with the fixator. To correct rotational deformity, two sets of pins were inserted into the proximal bone fragment of the tibia at the time of the operation, and after lengthening the proximal pin clamp of the fixator was disconnected from one pin set and reconnected to the other set. We applied this method to four tibias of three patients without any complications. The tension of the tissues was monitored using a pressure sensor built into a Hifixator to prevent the tissues from overstretching. During and after the correction, the tension of the tissue was maintained at less than before the correction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004020050241
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  • 4
    Electronic Resource
    Electronic Resource
    Changes of callus diameter during axial loading and after fixator removal in leg lengthening (1998)
    Springer
    Archives of orthopaedic and trauma surgery 117 (1998), S. 464-467 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We retrospectively reviewed nine tibial lengthenings in seven achondroplastic patients. The callotasis method was used, and a unilateral type lengthener, either the Dynamic Axial Fixator (Orthofix, Italy; eight legs) or the High Functional Fixator (Matsumoto Co., Japan; one leg), was applied. The distracted length averaged 14.6 (range 10–18) cm. The minimum diameter of the callus was measured using a ruler on anteroposterior and lateral radiographs. The callus diameter ratio (%) was calculated as the callus diameter divided by the original diaphysis diameter. For periods during axial loading and after removal of the fixator in each patient, a single regression line was drawn on the callus diameter ratio data using the least squares method, and the diameter change rate (%/day) was evaluated by inclination of this line. The diameter change rates during axial loading were negative in six legs, but those after fixator removal were positive in all legs, and the latter were significantly greater than the former. The diameter change rates after fixator removal on the anteroposterior radiographs were negatively correlated with the callus diameter ratio at the time of fixator removal (r = 0.84, P = 0.0008). Simple axial loading may not be a sufficient mechanial environment for restoration of the physiological shape, and it is important to be aware that we cannot expect the callus diameter to increase by this means alone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004020050294
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  • 5
    Electronic Resource
    Electronic Resource
    Aspiration of intraspinal synovial cyst: recurrence after temporal improvement (1998)
    Springer
    Archives of orthopaedic and trauma surgery 118 (1998), S. 103-105 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Intraspinal synovial cyst primarily occurs in the lumbar spine and may cause back pain and compression nerve disturbance. Percutaneous aspiration has been recommended as an alternative to surgery in three cases. We report on two patients who improved after aspiration of gelatinous material and steroid injection but whose cyst recurred within a short period of time. There are reportedly two types of synovial cyst: One contains serosanguinous fluid and the other gelatinous fluid. These two types are indistinguishable on computed tomography or magnetic resonance imaging. The results of all patients whose aspirated material was gelantinous were unsuccessful, including our cases. Thus, the outcome may depend on the pathology of the cyst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004020050323
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  • 6
    Electronic Resource
    Electronic Resource
    Risk factors of myelopathy at the atlantoaxial level in spondyloepiphyseal dysplasia congenita (1998)
    Springer
    Archives of orthopaedic and trauma surgery 117 (1998), S. 468-470 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Spondyloepiphyseal dysplasia congenita (SEDC) can be accompanied by hypoplasia of the odontoid and/or lax ligaments which may lead to spinal cord compression. Since an early diagnosis of myelopathy is essential for rational treatment, identification of the high-risk factors is imperative. Sixteen patients were retrospectively reviewed, 10 male and 6 female, and their average age at the time of examination was 18 (range 3–37) years. Myelopathy was seen in 6 individuals. Five were associated with atlantoaxial subluxation, and the critical value of space available for the spinal cord at the level of the atlas was 10 mm or less. Their height was less than –7SD of average Japanese of the same age, and all were associated with severe coxa vara. Although SEDC itself is a risk factor, marked short stature of less than –7SD and severe coxa vara are particularly high-risk factors for cord compression at the level of the atlas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004020050295
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  • 7
    Electronic Resource
    Electronic Resource
    Callus formation in the humerus compared with the femur and tibia during limb lengthening (1998)
    Springer
    Archives of orthopaedic and trauma surgery 117 (1998), S. 262-264 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We investigated whether the callus formation in the humerus during the distraction period of limb lengthening proceeds at a higher rate than that in the femur and tibia. Ten achondroplastic patients underwent 3 bilateral humerus, 3 bilateral femur and 4 bilateral tibia lengthenings. To reduce the confounding effect of bone size, we used bone mineral apparent density (BMAD) to compare the three groups; this is a volumetric bone mineral density measurement. BMAD in the distracted callus space was evaluated at 8 weeks after the start of distraction using dual-energy X-ray absorptiometry (mean ± SD; g/cm3): in the humerus (0.24 ± 0.08) it was significantly higher than in the tibia (0.10 ± 0.02), while there was no difference between the humerus and femur (0.35 ± 0.11). We conclude that the callus formation in the humerus during the distraction period of limb lengthening proceeded at a significantly faster rate than in the tibia, but there was no significant difference between the humerus and femur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004020050242
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  • 8
    Electronic Resource
    Electronic Resource
    Drug susceptibility of PCA in WBB6F1-W/Wv mice (1998)
    Springer
    Cellular and molecular life sciences 54 (1998), S. 456-460 
    Details
    ISSN: 1420-9071
    Keywords: Key words. PAF; PCA; WBB6F1-W/Wv; anti-mouse granulocyte antibody.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Our previous study revealed that passive cutaneous anaphylaxis (PCA) can be produced in congenitally mast cell-deficient WBB6F1-W/Wv (abbreviated as W/Wv) mice on sensitization with undiluted or slightly diluted allogeneic and xenogeneic antisera but not on sensitization with allogeneic monoclonal immunoglobulin (Ig)E and IgG1 antibodies regardless of the antibody concentration [1]. In view of these findings, the present study was conducted to characterize PCA in this strain from its drug susceptibilities using mast cell-bearing WBB6F1-+/+ (abbreviated as +/+) and B6D2F1 mice as references. PCA in W/Wv mice mediated by a low dilution (1  4) of hyperimmune serum to bovine serum albumin of the B6D2F1 mouse origin was markedly suppressed by CV-6209, an antagonist of platelet-activating factor (PAF), but not by antihistamines such as cyproheptadine and oxatomide. In contrast, PCA in +/+ and B6D2F1 mice mediated by a high dilution (1  128) of the anti-serum (virtually by IgG1 antibody) was nearly completely suppressed by antihistamines but not by CV-6209. A remarkable difference between PCA in W/Wv and reference mice was also observed in the susceptibility to monoclonal anti mouse granulocyte (Gr-1) antibody PCA in W/Wv mice was potently suppressed by the 1- to 3-day pretreatment with this antibody but that in references was not at all. Putting these present results together with the previous finding that anti-granulocyte antibody greatly reduces circulatory Gr-1+ leukocytes, 1 to 3 days after the treatment [2], it is highly probable that PCA in W/Wv mice mediated by some antibody isotypes other than IgE and IgG1 is produced by PAF mainly released from Gr-1+ cells, while IgG1 antibody-mediated PCA in mast cell-bearing reference mice is evoked by histamine derived from mast cells. PCA homologous to that in W/Wv mice could also be produced in the reference mice on sensitization with undiluted or slightly diluted antiserum, when generalized blueing due to excess IgG1 antibody was removed by the oxatomide treatment be fore the antigen challenge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000180050173
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  • 9
    Electronic Resource
    Electronic Resource
    Radiation-Induced Brain Tumours: Potential Late Complications of Radiation Therapy for Brain Tumours (1998)
    Springer
    Acta neurochirurgica 140 (1998), S. 763-770 
    Details
    ISSN: 0942-0940
    Keywords: Keywords: Cranial radiation therapy; radiation-induced tumour; radionecrosis; diagnosis; treatment.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary  The development of neoplasms subsequent to therapeutic cranial irradiation is a rare but serious and potentially fatal complication. In this study, we retrospectively reviewed the clinical and pathological aspects of 11 patients who underwent cranial irradiation (range, 24–110 cGy) to treat their primary disease and thereafter developed secondary tumours within a span of 13 years. All tumours arose within the previous radiation fields, and satisfied the widely used criteria for the definition of radiation-induced neoplasms. There was no sex predominance (M: 5, F: 6) and the patients tended to be young at irradiation (1.3–42 years; median age: 22 years). The median latency period before the detection of the secondary tumour was 14.5 years (range: 6.5–24 years). Meningiomas developed in 5 patients, sarcomas in 4, and malignant gliomas in 2. A pre-operative diagnosis of a secondary tumour was correctly obtained in 10 patients based on the neuro-imaging as well as nuclear medicine findings. All patients underwent a surgical removal of the secondary tumour, 3 underwent additional chemotherapy, and one received stereotactic secondary irradiation therapy. During a median of 2 years of follow-up review after the diagnosis of a secondary tumour, 3 patients died related to the secondary tumours (2 sarcomas, 1 glioblastoma), one died of a recurrent primary glioma, while the remaining 7 have been alive for from 10 months to 12 years after being treated for the secondary tumours (median: 3 years). Based on these data, the clinicopathological characteristics and possible role of treatment for secondary tumours are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007010050177
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  • 10
    Electronic Resource
    Electronic Resource
    Sonographic detection of haemodynamic changes in a case of vertebrobasilar insufficiency (1998)
    Springer
    Neuroradiology 40 (1998), S. 164-166 
    Details
    ISSN: 1432-1920
    Keywords: Key words Vertebrobasilar insufficiency ; Compression ; arterial ; Ultrasonography ; Surgical decompression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We present a diagnostically challenging case of vertebrobasilar insufficiency caused by head rotation. The patient was a 58-year-old man complaining of dizziness and faintness with head rotation to the left. Vertebral arteriography with the head turned to the left revealed mechanical compression of the right vertebral artery at the occipitoatlantal joints and an occluded left vertebral artery. Duplex sonography demonstrated disappearance of the end-diastolic flow signal in the right vertebral artery on head rotation, paralleling the appearance of symptoms. Decompression of the vertebral artery by transversectomy of the atlas and hemilaminectomy of the axis completely relieved the symptoms and the Doppler flow signal pattern of the vertebral artery returned to normal: End-diastolic flow in the right vertebral artery did not disappear even when the head was rotated to the left.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050560
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