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  • 1
    Digitale Medien
    Digitale Medien
    Large magnetic-field-induced strains in Ni2MnGa single crystals (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 1966-1968 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Strains of nearly 0.2% have been induced along [001] in unstressed crystals of Ni2MnGa with magnetic fields of 8 kOe applied at 265 K. These stains are associated with the superelastic motion of twin boundaries in the martensitic phase that is stable below about 274 K. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.117637
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  • 2
    Digitale Medien
    Digitale Medien
    Field-induced strain under load in Ni–Mn–Ga magnetic shape memory materials : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 7297-7299 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Single-crystal Ni2MnGa shows a nearly 0.2% strain under a magnetic field of 8 kOe at −8 °C. Polycrystalline samples have been prepared near stoichiometry to study the composition dependence of the magnetic and elastic properties. A narrow band of compositions has been found having a range of Curie and martensitic transformation temperatures, Tc and T0, extending to above room temperature. The compressive stress–strain characteristics in variable transverse field were studied in samples selected to have T0 just below room temperature. Stress-induced martensite was observed as expected and the magnetic field was applied under fixed load for various stresses. A transverse field of 3200 Oe caused the sample to strain under load doing work that increased up to 1.3 J/kg with increasing volume fraction of stress-induced martensite. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.367758
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  • 3
    Digitale Medien
    Digitale Medien
    Magnetic-field-induced strain in Ni2MnGa shape-memory alloy (abstract) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5416-5416 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Rare-earth/transition-metal alloys can exhibit magnetostrictive strains of order 0.17% in modest fields. Larger strains are of interest for many actuator applications. Certain alloys that undergo martensitic transformations exhibit a shape–memory effect that can yield strains up to 20% upon heating the deformed martensitic phase and they can show superelasticity upon application of a small stress. These methods of activation can be a disadvantage for many applications; magnetic activation of a shape–memory effect is desired. Several magnetic shape–memory alloys exist, among them intermetallics based on Ni2MnGa, which are the subject of this work. These materials experience a 6.6% c-axis contraction on cooling through the martensitic transition temperature, which is near 273 K; this strain is accommodated by formation of an ensemble of strained twin crystals separated by twin boundaries. Strains of several percent could be produced magnetically if the twin boundaries could be moved under application of a magnetic field. We report observations of strains of nearly 0.2% induced along [001] in unstressed crystals of Ni2MnGa with magnetic fields of 8 kOe applied at 265 K (Fig. 1). (This strain is an order of magnitude larger than the magnetostrictive strain we measure in the parent Heusler phase at 283 K.) Our data suggest that these giant strains are associated with the superelastic motion of twin boundaries in the martensitic phase, which is stable below about 274 K; the strength of the measured anisotropy energy density, MSHa/2 is comparable to the elastic energy density, eσ/2, needed for superelastic twin boundary motion.1 The strains we observe are equivalent to those achieved in terfenol-D and represent only a small fraction of the strain available if the twin variants of the martensitic phase can be oriented prior to application of a field. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.364556
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  • 4
    Digitale Medien
    Digitale Medien
    Heterogeneity in cDNA clones encoding rice glutelin
    Amsterdam : Elsevier
    FEBS Letters 222 (1987), S. 135-138 
    Details
    ISSN: 0014-5793
    Schlagwort(e): (Rice) ; Amino acid sequence ; Glutelin ; Nucleotide sequence ; cDNA clone
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(87)80206-5
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  • 5
    Digitale Medien
    Digitale Medien
    The preparation and characterization of RuTe"2 single crystals
    Amsterdam : Elsevier
    Journal of Crystal Growth 135 (1994), S. 224-228 
    Details
    ISSN: 0022-0248
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-0248(94)90744-7
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  • 6
    Digitale Medien
    Digitale Medien
    Allopurinol blocks shock-wave-induced rises in cytosolic calcium levels in MDCK cells (1997)
    Springer
    Urological research 25 (1997), S. 427-432 
    Details
    ISSN: 1434-0879
    Schlagwort(e): MDCK cells ; Allopurinol ; Shock waves ; Lithotripsy ; Calcium signalling
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Allopurinol has been reported to ameliorate the side effects in patients following shock wave lithotripsy (SWL); however, the mechanism has not been studied. We have examined the protective effect of allopurinol on Madin-Darby canine kidney (MDCK) cells after shock wave exposure (SWE) by determining the release of aspartate aminotransferase (ASAT) and lactate dehydrogenase (LD), and the resting cytosolic Ca2+ concentration ([Ca2+]i). In SWE-treated cells, the release of ASAT and LD increased immediately, but largely transiently, by approximately 23% and 5-fold over control, respectively. Within 1–6 h after SWE there was a gradual rise in the resting [Ca2+]i of 16–137% above control. Allopurinol did not affect the transient enzyme release but blocked the long-term rises in the resting [Ca2+]i. The transient changes in [Ca2+]i evoked by two hormones, ATP and bradykinin, and a drug that releases Ca2+ from internal Ca2+ stores, thapsigargin, were only slightly affected in allopurinol-treated cells. We conclude that the protection conferred by allopurinol on patients treated with SWL might involve a direct protection of the kidney cells by maintaining a normal resting [Ca2+]i.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01268861
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  • 7
    Digitale Medien
    Digitale Medien
    Reduction of calcium excretion in the stone-forming kidney in unilateral ureteral obstruction (1991)
    Springer
    Urological research 19 (1991), S. 193-198 
    Details
    ISSN: 1434-0879
    Schlagwort(e): Urolthiasis ; Obstructive uropathy ; Percutaneous nephrostomy ; Hypercalciuria ; Creatinine clearance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Thirteen urolithiasis patients with unilateral obstructive uropathy were treated with percutaneous nephrostomy (PCN) either for urinary diversion, endopyelotomy, nephrolithtotmy or chemolysis. After percutaneous nephrostomy, the indvidual urine volume, creatinine clearance (Ccr), urinary absolute and fractional excretions of sodium, potassium, calcium, magnesium and inorganic phosphate were measured separately in timed urine collections from a pigtail catheter and from the urethra. The data showed that Ccr and the absolute urinary excretions of sodium, potassium, calcium, magnesium and inorganic phosphate were significantly lower in the PCN kidney immediately or 2 days after relief of obstruction. The ratio of total urinary calcium excretion to urinary creatinine excretion in the obstructed kidney was significantly greater than that in the contralateral kidney. The fractional excretions of calcium and magnesium increased as renal function decreased. The results showed that when the total Ccr is below normal, the apparent excretion of urinary calcium will be underestimated. However, when the total Ccr of patients is within normal range, hypercalciuria may be detected adequately and thus favors early implementation of an appropriate therapeutic strategy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00303749
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  • 8
    Digitale Medien
    Digitale Medien
    Computed tomography of spontaneous intracranial haemorrhage due to haemostatic disorders in children (1993)
    Springer
    Neuroradiology 35 (1993), S. 619-621 
    Details
    ISSN: 1432-1920
    Schlagwort(e): CT ; Intracranial haemorrhage ; Hypoprothrombinaemia ; Thrombocytopenia ; Haemophilia
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Intracranial haemorrhage is a serious problem in haemostatic disorders in children. Intracranial bleeding is sometimes more marked than suspected clinically. Computed tomography (CT) permits accurate, sensitive diagnosis of intracranial haemorrhage. We report 13 patients; 3 patients with hypoprothrombinaemia, 4 patients with thrombocytopenia or platelet dysfunction and 6 with haemophilia A, B or Von-Willebrand's disease. One patient with hypoprothrombinaemia had a subarachnoid hemorrhage (SAH), one a subdural haematoma (SDH) and the third a combination of SAH, SDH and intracerebral haematoma (ICH). One patient with thrombocytopenia or platelet dysfunction had a SDH, while the others had ICH. In the six patients with haemophilia A, B or Von-Willebrand's disease, there were four examples of ICH, five of SAH and six of SDH. A neurosurgical procedure was performed in only one patient. Three children died of serious intracranial complications with uncal herniation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00588410
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  • 9
    Digitale Medien
    Digitale Medien
    Solitary maxillary central incisor and congenital nasal pyriform aperture stenosis (1997)
    Springer
    European journal of pediatrics 157 (1997), S. 39-44 
    Details
    ISSN: 1432-1076
    Schlagwort(e): Key words Solitary maxillary central incisor ; Holoprosencephaly ; Congenital nasal pyriform aperture Chromosome 18p- ; or ring(18) ; Stenosis ; Hypopituitarism
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Solitary maxillary central incisor (SMCI) and congenital nasal pyriform aperture stenosis (CNPAS) have been reported as an isolated morphogenic defect or associated with pituitary deficiency, holoprosencephaly, ocular coloboma, or chromosomal abnormalities. We report two cases and analyse 40 cases of SMCI and 24 cases of CNPAS, including 15 cases of combined SMCI and CNPAS, obtained from the literature. Of the patients with SMCI, 69% had short stature, 48% growth hormone deficiency or hypopituitarism, 23% pituitary absence or hypoplasia, and 17% had del (18p-) or r(18). Of the patients with CNPAS, 63% had SMCI, 75% were short, 43% had hypopituitarism or growth hormone deficiency, 36% had pituitary or CNS anomaly, and 33% had del (18p), r(18), or del (13q). Conclusions Solitary maxillary central incisor and congenital nasal pyriform aperture stenosis can be a diagnostic clue to pituitary hypofunction, CNS, ophthalmological and cytogenic anomalies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004310050763
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  • 10
    Digitale Medien
    Digitale Medien
    Conversion of 12-hydroxyoctadecanoic acid to 12,15-, 12,16- and 12,17-dihydroxyoctadecanoic acids with Bacillus sp. U88 (1996)
    Springer
    Biotechnology letters 18 (1996), S. 193-198 
    Details
    ISSN: 1573-6776
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Summary A new microbial isolate, Bacillus sp. U88, transformed 12-hydroxyoctadecanoic acid to 12,15-, 12,16- and 12,17-dihydroxyoctadecanoic acids when grown aerobically in 1 % yeast extract medium at 30°C and shaken at 250 rpm for 5 days. These three dihydroxyfatty acids were derivatized with Trimethylsilyl ether and identified by GC-MS analysis. The yield of 12,15-, 12,16- and 12,17-dihydroxyoctadecanoic acids after 5 day incubation were 2.8 %, 7.1 % and 1.1 %, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00128678
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