1,721,039 research outputs found
Exploring Remoteness
Full text linkKolbeck, Felix: Travel far, experience closeness? : Of geographical and other distances
Bausch, Thomas & Humpe, Andreas: Travel far, experience closeness? : Of geographical and other distances
Rauscher, Marion: Experts exchange ideas in the Far East : Conference visit in Bangkok and competences required for the 21st century
Humpe, Andreas: Cyclists’ perception of exhaust emissions : An economic evaluation
Juhnke, Alina Luisa: Tourism between culture and commerce : The effects of tourism on developing countries
Cornejo, Annmarie: California Polytechnic State University : Learn by Doin
A prospective, randomized, sequential crossover trial of large-volume versus normal-volume leukapheresis procedures: effects on serum electrolytes, platelet counts, and other coagulation measures
No full textBACKGROUND: LVL procedures with the administration of heparin as an additional anticoagulant are increasingly performed because of the potentially higher yield of autologous peripheral blood HPCs. A prospective, randomized crossover trial was performed to evaluate the influence of leukapheresis volume-that is, large versus normal-on serum electrolytes, platelet count, and other coagulation measures in 25 patients with breast cancer and 14 patients with non-Hodgkin's lymphoma. STUDY DESIGN AND METHODS: Patients were randomly assigned to start either with an LVL on Day 1 followed by a normal-volume leukapheresis (NVL) on Day 2 or vice versa. In LVL, heparin was administered in addition to ACD-A. Bleeding complications, transfusion support, whole-blood counts, and several coagulation measures as well as plasma heparin levels were evaluated. RESULTS: Although the duration, the infused amount of ACD-A, the flow rate, the drop in platelet count, and the drop in potassium were significantly greater in LVL, and although LVL patients also received heparin, there was no significant difference in clinical tolerance or bleeding complications. After LVL, patients exhibited a significantly longer activated partial thromboplastin time (APTT), with a median of 70 seconds (range, 44-100 sec), and a median anti-factor Xa activity of 0.69 IU per mt (range, 0.10-1.29 IU/mL). The value of the APTT after LVL correlated with anti-factor Xa activity (r = 0.37, p<0.05), but not with platelet count or heparin infusion rate. Markers for coagulation activation did not increase during NVL or LVL. CONCLUSION: LVL with heparin as an additional anticoagulant seems to be a safe procedure in patients with low preleukapheresis platelet counts. No activation of coagulation occurred after NVL or LVL procedures
Successful transplantation and engraftment of peripheral blood stem cells after cryopreservation, positive and negative purging procedures, and a second cryopreservation cycle
No full textTransplantation of peripheral blood stem cells (PBSC), positively and/or negatively selected immediately after harvest, has become a widely applied therapeutic option in hematological or oncological patients. The following case of peripheral blood stem cell transplantation represents the first case of successful transplantation of PBSC, cryopreserved twice and purged after cryopreservation. PBSC were harvested in a 44-year-old female patient with a low-grade non-Hodgkin's lymphoma stage IV after mobilization with chemotherapy and G-CSF. A total number of 15.2 x 10(6) CD34(+) cells/kg bodyweight was harvested with a 36.9% contamination of tumor cells coexpressing CD5 and CD20. After subsequent chemotherapy cycles and cyclophosphamide mobilization, only 0.77 x 10(6) CD34(+) cells/kg bodyweight, not sufficient for transplantation, were achieved after positive selection. Therefore, 10.8 x 10(6) cryopreserved CD34(+) cells/kg bodyweight were thawed and a positive selection was carried out with the BAXTER Isolex 300i machine. Before additional negative selection, the 0.77 x 10(6) positively selected CD34(+) cells/kg bodyweight from the second mobilization were added. A total quantity of 4.4 x 10(6) CD34(+) cells/kg bodyweight with a purity of 93.1% representing a recovery of 38% was obtained. Cells were again cryopreserved, stored and retransfused after conditioning the patient with TBI and high-dose cyclophosphamide. The patient engrafted with a WBC count >1000/mul on day eight and a platelet count > 20,000/mul without transfusion support on day 12 post-transplantation. This case indicates that purging procedures can successfully be carried out with cryopreserved cell material and that purified CD34(+) cells can be cryopreserved a second time before transplantation, without affecting their hematopoietic capacity
Isolated meningeal chloroma (granulocytic sarcoma) - a case report and review of the literature
No full textIsolated chloromas (granulocytic sarcomas) are rare tumors, most of them progressing to acute myeloblastic leukemia within months. There are still no conclusive treatment strategies for this entity; however, early antileukemic chemotherapy seems to lower the probability of developing systemic disease and prolong survival. We report on a patient with isolated meningeal chloroma, primarily misdiagnosed as a high-grade Non-Hodgkin's lymphoma. Two cycles of antileukemic induction chemotherapy were administered, followed by local irradiation and intensified consolidation therapy with autologous stem cell transplantation. After 20 months, he is still in complete remission
Innovation
Full text linkKolbeck, Felix: Innovations – who’s responsible?
Greischel, Peter: Innovating successfully in tourism
Chang, Celine & Werther, Simon: Innovations in HR management : Analysis of the winners of the Hospitality HR Award
Gruner, Axel: Camping – a sector seeing fundamental change
Humpe, Andreas & Kastner, Ralf & Mesch, Kerstin: Carbon-neutral air traffic by 2050? : New scenarios for aviatio
Tourism and Design
Full text linkPillmayer, Markus: Designing desires : Use of experience technologies in destination development
Wörrmann, Michael & Berchtenbreiter, Ralph: User Centred : Design thinking for good user experience
Rauscher, Marion: Design in the virtual space : Journeys back in time
Humpe, Andreas: Beyond traditional learning methods : Why field trips are pedagogically valuable
Liem, Cornelia & Regul, Christina: Your gateway to the world : International range of courses at the Department
Berchtenbreiter, Ralph: “To learn you have to travel” : Internationalization aims and strategies at the Department
Chang, Celine: New International Semester : A benefit for the Bachelor’s Programm
Prospective, randomized, sequential, crossover trial of large-volume vs. normal-volume leukapheresis procedures: Effects on subpopulations of CD34(+) cells
No full textSome data exist on the influence of leukapheresis volume on the number of harvested peripheral blood hematopoietic progenitor cells (HPC), but less is known about the influence on the composition of HPC. We therefore performed a prospective, randomized crossover trial to evaluate the effect of large-volume (LVL) vs. normal-volume leukapheresis (NVL) on subpopulations of CD34(+) cells in the harvest product of 15 patients with breast cancer and 8 patients with non-Hodgkin's lymphoma. Patients were randomly assigned to start either with an LVL on day 1 followed by an NVL on day 2 or vice versa. The number of HPC; the extraction efficiency defined as difference between yield in the harvest and decrease in peripheral blood, and the relative proportion as well as the absolute numbers of CD34(+) cells coexpressing CD38, CD90, HLA-DR, CD117, CD7, CD19, CD41, or CD33 were evaluated. There was no significant difference with regard to the percentages of the subsets on comparison of LVL to NVL procedures. Only the absolute median number of CD34(+)HLA-DR- cells was significantly (P=0.02) higher in LVL harvests compared with the corresponding NVL components; which can be explained on the basis of the higher yield and the higher extraction efficiency in LVL compared with NVL. LVL results in a higher yield of CD34(+) cells and leads to an intra-apheresis recruitment of HPC but the relative composition of the harvested CD34(+) cells is not changed significantly. In addition, the amount of early, HLA-DR-, hematopoietic HPC seems to be increased by an LVL. (C) 2001 Wiley-Liss, Inc
Filtration of methylene blue-photooxidized plasma: influence on coagulation and cellular contamination
No full textBACKGROUND: Virus inactivation of plasma can be achieved by photodynamic methods in the presence of phenothiazine dyes such as methylene blue (MB). Subsequent filtration may increase the efficacy of virus inactivation and reduce adverse effects of WBC contamination and MB. STUDY DESIGN AND METHODS: This study examined the effect of filtration with three different filters (MBF1, MBF2, and MBF3) on MB concentration, residual cells, coagulation factors, and activation measures of coagulation, fibrinolysis, and complement in MB-treated (1 muM/L) plasma units. RESULTS: Filtration reduced the concentration of MB by greater than or equal to 89 percent. WBCs were depleted by 92 percent (MBF1) and >99.9 percent (MBF2 and MBF3). Treatment with MB significantly decreased the coagulation potency from levels in untreated plasma, as measured by thromboplastin time ratio (112 +/- 18% vs. 95 +/- 11%), activated partial thromboplastin time (40 +/- 3 sec vs. 44 +/- 3 sec), thrombin time (16.9 +/- 1.1 sec vs. 18.6 +/- 1.5 sec), factor VIII (1.09 +/- 0.21 U/mL vs. 0.85 +/- 0.13 U/ mt), and vWF (0.94 +/- 0.65 U/mL vs. 0.65 +/- 0.24 U/mL). Filtration did not further decrease these values, while factor XI (0.75 +/- 0.22 U/mL vs. 0.37 +/- 0.20 U/mL) and prekallikrein values decreased in MB plasma units filtered with the MBF3. In addition, activated factor XII (0.7 +/- 0.5 mug/L vs. 4.5 +/- 1.0 mug/L) increased. CONCLUSION: WBCs and MB can be eliminated from MB-treated plasma units by filtration. Differences in biocompatibility of the different filters, especially the influence on the contact phase of coagulation, must be taken into consideration
Cryopreservation of cellular products in a closed bag system with an incorporated dimethyl-sulfoxide-resistant sterile filter outside of cleanroom facilities
No full textFlow-cytometric screening of platelet antibodies with previously frozen cells
No full textIn this study the flow-cytometric crossmatch results were compared between fresh cells and cells processed by various cryopreservation and storage methods. Platelets from healthy donors were incubated with 12 sera containing platelet reactive antibodies as well as with 62 control sera from blood donors. Direct comparisons were made between fresh platelets and platelets after freezing at -28 degrees C, -40 degrees C and -80 degrees C and in liquid nitrogen, using 6% DMSO as cryoprotectant. In addition, the effects of using controlled-rate freezing were evaluated. Finally we evaluated the application of the cryoprotectant ThromboSol. The best results were obtained after cryopreservation of the platelets with ThromboSol at -80 degrees C with controlled cooling rates. Using ThromboSol cryopreserved platelets, the sensitivity for the detection of incompatible platelets was 100% and the specificity was 97.1%, using the previous results obtained with flow-cytometry, MAIPA and LCT as a reference. Conclusion: Platelets can be frozen using ThromboSol as the cryoprotectant, with controlled rate freezing and storage at -80 degrees C for the screening of platelet antibodies and for flow-cytometric crossmatch procedures. This system yields a reproducible and logistically simple method for platelet crossmatching that yields results superior to fresh cells and can be easily incorporated into standard clinical laboratory practices. (c) 2004 Elsevier B.V. All rights reserved
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