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  • 1
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Glutamate is the principal excitatory neurotransmitter in the nervous system. Inactivation of synaptic glutamate is handled by the glutamate transporter GLT1 (also known as EAAT2; refs 1, 2), the physiologically dominant astroglial protein. In spite of its critical ...
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1436-2813
    Keywords: neoadjuvant chemotherapy ; breast carcinoma ; CAF ; CMF
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Sixty nine patients with a median age of 45 years, 62.3 per cent of whom were premenopausal, with locally advanced breast cancer (T 4, N 0–3, M 0; Stage IIIb) were treated with 3 cycles of either neoadjuvant cyclophosphamide, doxorubicin and 5-fluorouracil, being the CAF group: 36 patients, or cyclophosphamide, methotrexate and 5-fluorouracil, being the CMF group: 33 patients. Patients achieving complete response or with residual disease of 〈2 cm in diameter received radical radiotherapy while those with more residual disease underwent radical mastectomy. Nine cycles of adjuvant chemotherapy were administered. Complete responses and disease control by radiotherapy with complete breast preservation were more frequently observed after CAF than CMF, being 25 per centvs 3 per cent (p=0.025) and 48.5 per centvs 12 per cent (p=0.002), respectively. Overall response rates, adverse effects, disease control following radiotherapy/ surgery, local relapses and metastases were similar for both regimes. Relapsing patients were young, with a median age of 38 years, 68.4 per cent of relapses occurred at metastatic sites and 42 per cent of relapses occurred during adjuvant chemotherapy. This study suggests that in locally advanced breast cancer, a greater proportion of patients can be rendered disease free after neoadjuvant CAF and radiotherapy compared to neoadjuvant CMF and radiotherapy.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Distributed computing 2 (1987), S. 45-59 
    ISSN: 1432-0452
    Keywords: Database systems ; Concurrency ; Optimistic protocols ; Distributed algorithms ; Rollbacks ; Transactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Concurrency control algorithms have traditionally been based on locking and timestamp ordering mechanisms. Recently optimistic schemes have been proposed. In this paper a distributed, multi-version, optimistic concurrency control scheme is described which is particularly advantageous in a query-dominant environment. The drawbacks of the original optimistic concurrency control scheme, namely that inconsistent views may be seen by transactions (potentially causing unpredictable behavior) and that read-only transactions must be validated and may be rolled back, have been eliminated in the proposed algorithm. Read-only transactions execute in a completely asynchronous fashion and are therefore processed with very little overhead. Furthermore, the probability that read-write transactions are rolled back has been reduced by generalizing the validation algorithm. The effects of global transactions on local transaction processing are minimized. The algorithm is also free from dedlock and cascading rollback problems.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-7209
    Keywords: angiogenesis ; endothelial cell ; heparan sulfate ; thrombospondin ; VEGF
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Vascular endothelial growth factor (VEGF) is a specific angiogenic factor, and thrombospondin (TSP), is a potent inhibitor of angiogenesis. To better understand the role of TSP as an anti-angiogenic agent, we have identified its specific domains that participate in its anti-angiogenic activity and examined the mechanism of its inhibitory effect on VEGF165 induced angiogenesis. Exogenously added TSP inhibited VEGF165 induced angiogenesis (proliferation and tube formation of human dermal microvascular endothelial cells {HDMEC} and neovascular outgrowth from human arterial rings). Although both VEGF165 and TSP are heparin binding proteins, TSP had a higher affinity for 125I-heparin than VEGF165 (K d1 4 nM and K d2 14 nM for TSP; K d 91 nM for VEGF165). TSP displaced 36% of 125I-VEGF165 from HDMEC and this was comparable to the 27% reduction in 125I-VEGF165 binding to HDMEC upon cleavage of cell surface heparan sulfate (HS). About 35% of the mitogenic activity of VEGF165 was attributable to its heparin binding region. These results indicate that a proportion of the mitogenic activity of VEGF165 is inhibited by TSP via competition for cell surface HS. Further, 125I-VEGF165 bound directly to TSP in a saturable, concentration dependent manner, and heparin modulated this binding. The mAbs to the heparin binding domain to the type 1 and type 3 repeats of TSP inhibited the binding of VEGF165 to TSP, and also blocked the inhibitory effect of TSP on VEGF165 induced HDMEC proliferation. We conclude that (i) the anti-angiogenic activity of TSP is localized in its heparin binding domain and type 1 and type 3 repeats (ii) TSP inhibits angiogenesis by at least two separate mechanisms, (a) displacement of VEGF165 from endothelial cell HS and (b) direct binding to VEGF165.
    Type of Medium: Electronic Resource
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