5 resultados para Bicicletes tot terreny -- Amortidors

em University of Queensland eSpace - Australia


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Options for skin cancer treatment currently include surgery, radiotherapy, topical chemotherapy, cryosurgery, curettage, and electrodes-sication. Although effective, surgery is costly and unsuitable for certain patients. Radiotherapy can leave a poor cosmetic effect, and current chemotherapy is limited by low cure rates and extended treatment schedules. Here, we describe the preclinical activity of a novel topical chemotherapeutic agent for the treatment of skin cancer, 3-ingenyl angelate (PEP005), a hydrophobic diterpene ester isolated from the plant Euphorbia peplus. Three daily topical applications of 42 nmol (18 mug) of PEP005 cured a series of s.c. mouse tumors (B16 melanoma, LK2 UV-induced squamous cell carcinoma, and Lewis lung carcinoma; it = >14 tumors/group) and human tumors (DO4 melanoma, HeLa cervical carcinoma, and PC3 and DU145 prostate carcinoma; it = >4 tumors/group) previously established (5-10 mm(3)) on C57BL/6 or Fox1(nu) mice. The treatment produced a mild, short-term erythema and eschar formation but, ultimately, resulted in excellent skin cosmesis. The LD90 for PEP005 for a panel of tumor cell lines was 180-220 muM. Electron microscopy showed that treatment with PEP005 both ill vitro (230 tot) and ill vivo (42 nmol) rapidly caused swelling of mitochondria and cell death by primary necrosis. Cr-51 release, uptake of propidium iodide, and staining with the mitochondria dye JC1, revealed that PEP005 (230 muM) treatment of tumor cells ill vitro resulted in a rapid plasma membrane perturbation and loss of mitochondrial membrane potential. PEP005 thus emerges as a new topical anti-skin cancer agent that has a novel mode of action involving plasma membrane and mitochondrial disruption and primary necrosis, ultimately resulting in an excellent cosmetic outcome.

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We thank Hilberts and Troch [2006] for their comment on our paper [Cartwright et al, 2005]. Before proceeding with our specific replies to the comments we would first like to clarify the definitions and meanings of equations (1)-(3) as presented by Hilberts and Troch [2006]. First, equation (1) is the fundamental definition of the (complex) effective porosity as derived by Nielsen and Perrochet [2000]. Equations (2) and (3), however, represent the linear frequency response function of the water table in the sand column responding to simple harmonic forcing. This function, which was validated by Nielsen and Perrochet [2000], provides an alternative method for estimating the complex effective porosity from the experimental sand column data in the absence of direct measurements of h_(tot) (which are required if equation (1) is to be used).

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The psychometric properties of the Rosenberg Self-Esteem Scale (RSES) as a clinical research instrument for acute coronary syndrome (ACS) patients were investigated in a translated Chinese version of the instrument. A confirmatory factor analysis was conducted on the RSES to establish its psychometric properties in 128 ACS patients over two observation points (within 1 week and 6 months post-admission for ACS). Internal and test - retest reliability of the RSES-TOT (all-items) and RSES-POS sub-scale (positively valenced items) were found to be acceptable. The RSES-NEG sub-scale (negatively valenced items) lacked acceptable internal reliability. The underlying factor structure of the RSES comprised two distinct but related factors, though there was inconsistency in best model fit indices at the 1-week observation point. The use of the RSES as two sub-scales (RSES-POS and RSES-NEG) may be clinically useful in evaluating the influence of this important psychological construct on the health outcomes of patients with ACS. Directions for future research are indicated.

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The CARI1 draft dialysis guidelines propose evidence based targets for biochemical and haematological parameters in ESRF. As part of a prospective randomised trial we investigated our ability to apply the CARI and National Heart Foundation of Australia targets to a representative dialysis population. All patients aged between 18–80 yrs were encouraged to enroll regardless of prior history of non-compliance or co-morbidity. Patients were randomised to either usual care (U;n = 44) or focussed care (F;n = 45). Usual care involved monthly blood tests and pysician review second monthly. In addition focus care patients had a monthly review in a physician supervised trial clinic run by nurses. The groups were comparable at baseline in terms of age, gender, dialysis modality, proportion of diabetics, time on dialysis, haemoglobin, ferritin, % saturation, parathyroid hormone, serum corrected calcium, serum phosphate, total cholesterol and LDL. At 6 months there had been significant improvements in PTH (p < 0.05), total cholesterol (p < 0.05) and LDL (p < 0.001), and a trend to better BP control. The proportion of patients meeting targets at 6 months were as follows: tot chol < 5 mmol/l-U 63%, F 82%; LDL < 3 mmol/l-U 75%, F 91%; phosphate < 1.8 mmol/l- U 42%, F 62%; PTH < 21 pmol/l-U 21%, F 40%; BP sys < 140 mmHg-U 41% F 46%; Hb > 11.5 g/dl U 58% F 64%. In spite of an intensive programme to maximise management of the haematological and biochemical parameters in patients with ESRF it appears that in a significant proportion of patients these targets could not be reached. 1The CARI Guidelines (Caring for Australians with Renal Impairment). Australian Kidney Foundation & Australia New Zealand Society of Nephrology, 2001.