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  • Blackwell Science Ltd  (4)
  • Nature Publishing Group  (2)
  • 2000-2004  (5)
  • 1960-1964  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 191 (1961), S. 764-765 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] EVIDENCE, although scant, has accumulated during the past three decades which indicates that potential differences are produced during phase -transformations1-4. Unfortunately, the phenomena associated with such transformations have not been subjected to systematic study. Hence, we have only ...
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  • 2
    ISSN: 1072-8368
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Biochemical studies indicate that dimerization is required for the catalytic activity of herpesvirus proteases, whereas structural studies show a complete active site in each monomer, away from the dimer interface. Here we report kinetic, biophysical and crystallographic characterizations of ...
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  • 3
    ISSN: 1460-9592
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background: Neostigmine given through the neuraxial route has been found to have analgesic properties. In this clinical trial, we evaluated for the first time the efficacy of a varying dose of caudal neostigmine for postoperative analgesia in children undergoing genitourinary surgery.Method: In this double blind prospective study, we studied 120 children ASA physical status I in age group of 2–8 years scheduled for surgical repair of hypospadias under general anaesthesia. Children were randomly allocated to one of the six groups (n = 20 each) and received either no caudal block (group C) or neostigmine (groups I-V) in doses of 10, 20, 30, 40 and 50 μg·kg−1 respectively at the end of the surgery. Postoperatively pain was assessed using an objective pain score for 24 h. Blood pressure, heart rate, SpO2, total amount of analgesic consumed and adverse effects, if any, were also recorded.Result: The duration of postoperative analgesia did not differ significantly between group C and I (P 〉 0.05). There was significant prolongation in the duration of analgesia in rest of the groups (group II-3.52 ± 1.37 h; group III-6.50 ± 1.93 h; group IV-10.45 ± 3.41 h; group V-13.70 ± 5.52 h) (P 〈 0.05). A dose dependent increase in the incidence of nausea and vomiting was also observed with highest incidence in group IV and V (group C-15%; group I-20%; group II and III-30%; group IV-45% and group V-60%) (P 〈 0.05). No significant alteration in vital signs and other adverse effects were noticed.Conclusion: Caudal neostigmine in the dose range of 20–50 μg·kg−1 provides dose dependent analgesia. However, dose exceeding 30 μg·kg−1 is associated with a higher incidence of nausea and vomiting.
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Addiction 99 (2004), S. 0 
    ISSN: 1360-0443
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Psychology
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Rationale Asthmatic airway remodelling is characterized by myofibroblast hyperplasia and subbasement membrane collagen deposition. We hypothesized that cytokines and growth factors implicated in asthmatic airway remodelling are increased in bronchoalveolar lavage (BAL) fluid of asthmatics after segmental allergen challenge (SAC), and that these growth factors and cytokines increase α-smooth muscle actin (α-SMA) and collagen III synthesis by human lung fibroblasts (HLFs).Methods Transforming growth factor (TGF)-β1, TGF-β2, IL-4 and IL-13 levels were measured in BAL fluid from 10 asthmatics and 9 non-asthmatic controls at baseline and then 1 day, 1 week and 2 weeks after SAC. Confluent cultures of HLFs were stimulated by exogenous addition of TGF-β1, TGF-β2, IL-4 or IL-13 (concentration range 0.01–10 ng/mL) over 48 h. Collagen III was measured in culture supernates and α-SMA in cell lysates by Western blot.Results At baseline, there was no difference in BAL fluid concentrations of TGF-β1, IL-4 and IL-13 between asthmatics and controls; however, non-asthmatics had higher concentrations of total TGF-β2. In asthmatics, BAL fluid concentrations of all four factors increased significantly 1 day after SAC. TGF-β1, TGF-β2 and IL-13 concentrations returned to baseline by 1 week after SAC, but BAL fluid IL-4 concentration remained elevated for at least 2 weeks. TGF-β1, TGF-β2 and IL-4 significantly increased α-SMA in fibroblasts, but only IL-4 caused corresponding increases in collagen III synthesis. IL-13 had no direct effects on collagen III synthesis and α-SMA expression.Conclusions Because IL-4 caused a dose-dependent increase in α-SMA and collagen III synthesis, it may be an important cytokine mediating asthmatic airway remodelling. TGF-β1 and TGF-β2 may also play a role in airway remodelling by stimulating phenotypic change of fibroblasts to myofibroblasts. Additionally, collagen III synthesis appears to be independent of myofibroblast phenotype and is apparently regulated by different growth factors and cytokines.
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  • 6
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objectives To assess endothelial function and vascular mechanical properties in normotensive pregnant women with high resistance in the uteroplacental circulation.Design Cross-sectional prospective study.Setting Doppler ultrasound laboratory at university department of obstetrics and gynaecology referral centre for high risk pregnancies.Participants Forty-two caucasian normotensive pregnant women: 23 with uncomplicated pregnancies and 19 with bilateral uterine artery notches.Methods Flow-mediated dilatation of the brachial artery was measured by ultrasonography at 25 gestational weeks. Concentrations of nitrite and nitrate in the plasma were established at 25 and 32 gestational weeks. The elastic properties of the common carotid artery, abdominal aorta and popliteal artery were measured with an ultrasonic echo-tracking system.Results Flow-mediated dilatation at two minutes after cuff deflation was significantly lower in the bilateral notch group compared with the control group, 8.3% and 13.7%, respectively (P= 0.0007). The ability to sustain vasodilatation was reduced in the bilateral notch group (P= 0.02). Lower values of nitrite and nitrate in the plasma were found at 32 gestational weeks in the bilateral notch group than in the control group (mean 24.76 μM/L (SD 5.6) and 30.93 μM/L (8.2), respectively; P= 0.008). Nitrite and nitrate levels tended to be lower in the bilateral notch group even at 25 gestational weeks (29.45 μM/L (8.3) and 35.73 μM/L (11.0) in the bilateral notch and control group, respectively; P= 0.09). There was no difference in aortic, carotid or popliteal elasticity between the two groups.Conclusions Healthy normotensive pregnant women with bilateral uterine artery notches show impaired endothelial function, but no differences in vascular mechanical properties.
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