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  • 1990-1994  (3)
  • 1994  (2)
  • 1993  (1)
Material
Years
  • 1990-1994  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 2022-2024 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have developed a quasicontinuous crucible free zone melting method for texturing YBCO bulk material. Dense sintered rods with a length of 10 cm were partially molten in the hot zone of a 5 zone furnace and recrystallized in the large temperature gradient (140 °C/cm) limiting this zone. Suitable additions of Y2BaCuO5 (20 mol %) and PtO2 (1 wt %) to the starting material and a growth rate of not more than 1 mm/h were necessary to obtain stable growth conditions. After natural grain selection we obtained 8-cm-long rods with a uniform orientation of the crystallographic axes within 2°. The angle between c direction and rod axis typically was 55°. The critical current density at 77 K measured with continuous current over a length of 4.5 cm was 1.3×104 A/cm2 in zero field and 8×103 A/cm2 in 0.5 T. These values confirm the absence of grain boundaries.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Lytic transition of Epstein-Barr virus (EBV) is initiated by distinct immediate early regulators of the viral cycle, in synchronization to temporary, permissive conditions during host cell differentiation. We developed eukaryotic vectors suitable to imitate the processes involved in lytic transition in cell culture systems. Two stable B cell lines were established: R59Z activator cells were used to induce lytic EBV expression in a constitutive manner by the production of the BZLF 1trans-activator (Zta). R7-57 reporter cells, on the other hand, signaled induced activity of the lytic origin of EBV replication (oriLyt). Different modes, like chemical induction, lytic superinfection with EBV and single genetrans-activation converted the recombinant oriLyt element in R7-57 reporter cells. BZLF 1, transiently expressed in R7-57 reporter cells, was the only EBVtrans-activator found, sufficient in inducing the viral lytic cycle. Basing on these experiments,trans-cellular activation of EBV was tested by cocultivation of BZLF 1-expressing R59Z activator cells with the R7-57 reporter line. No lytic effect on the reporter cells could be measured, neither by cocultivation of activator cells nor by coincubation of BZLF 1-containing cell lysates. Latency breaking activity, however, was transferred from activator to reporter cells when active, exogenous virus was added. The cell system described in these experiments provides a tool for the detection of EBV reactivation and demonstrates the potential of the lytic regulatory gene BZLF 1.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Surgical endoscopy and other interventional techniques 8 (1994), S. 677-681 
    ISSN: 1432-2218
    Keywords: Monopolar electrosurgery ; Nd:YAG Contact Laser™ ; Intestinal surgery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In a prospective randomized study using a canine model, we compared the use of monopolar electrosurgery (EC) (n=23) and the Nd:YAG Contact Laser™ (CL) (n=21) on intra- and postoperative morbidity in laparoscopic large-bowel resection. In EC, cutting was performed with scissors and coagulation was performed with electrosurgery. In CL, cutting and coagulation were carried out with the Nd:YAG Contact Laser™. Laparoscopic oncologic right colectomy with intraperitoneal ileocolic stapled anastomosis was performed in all dogs. Intraoperative smoke development, difficulty of dissection, hemostasis, and postoperative adhesions were judged using a five-point score. Two weeks after surgery, all dogs were sacrificed and zoopsy was carried out. Three dogs died postoperatively from pneumonia and one from an anastomotic leak. There were no other postoperative complications. Operative time was 135 min (range 105–180) in the CL group and 145 min (range 60–210) in the EC group. Intraoperative smoke development, difficulty of dissection, and postoperative amount of adhesions were not different between groups (P〉0.05). Hemostasis in the CL group (median score of 1, range 1–2) was significantly better (P=0.01) than in the EC group (median score of 2, range 1–5). Scissors and electrosurgery as well as Nd:YAG Contact Laser™ can be used successfully in intestinal laparoscopic surgery. Although the use of the Contact Laser™ did not cause less postoperative morbidity than the conventional method, there was significantly better hemostasis using the Nd:YAG Contact Laser™.
    Type of Medium: Electronic Resource
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