986 resultados para Specific rights


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pt. 1. North American plants, arranged according to the Linnean artificial method: improved by Persoon, Pursh, Nuttall, and others.--pt. 2. North American plants, arranged according to Jussieu's natural method; improved by Lindley, Brown, De Candolle and others.

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Tartrate-resistant acid phosphatase (TRAP) is highly expressed in osteoclasts and in a subset of tissue macrophages and dendritic cells. It is expressed at lower levels in the parenchymal cells of the liver, glomerular mesangial cells of the kidney and pancreatic acinar cells. We have identified novel TRAP mRNAs that differ in their 5-untranslated region (5'-UTR) sequence, but align with the known murine TRAP mRNA from the first base of Exon 2. The novel 5'-UTRs represent alternative first exons located upstream of the known 5'-UTR. A similar genomic structure exists for the human TRAP gene with partial conservation of the exon and promoter sequences. Expression of the most distal 5'-UTR (Exon 1A) is restricted to adult bone and spleen tissue. Exon 1B is expressed primarily in tissues containing TRAP-positive nonhaematopoietic cells. The known TRAP 5'-UTR (Exon 1) is expressed in tissues characteristic of myeloid cell expression. In addition the Exon 1C promoter sequence is shown to comprise distinct transcription start regions, with an osteoclast-specific transcription initiation site identified downstream of a TATA-like element. Macrophages are shown to initiate transcription of the Exon 1C transcript from a purine-rich region located upstream of the osteoclast-specific transcription start point. The distinct expression patterns for each of the TRAP 5'-UTRs suggest that TRAP mRNA expression is regulated by the use of four alternative tissue- and cell-restricted promoters. (C) 2003 Elsevier Science B.V. All rights reserved.

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The polyphagous moth Helicoverpa armigera (Hubner) is one of the world's most important agricultural pests. A number of existing approaches and future designs for management of H. armigera rely on the assumption that moths do not exhibit either genetically and/or non-genetically based variation for host plant utilization. We review recent empirical evidence demonstrating that both these forms of variation influence host plant use in this moth. The significance of this variation in H. armigera in relation to current and future pest management strategies is examined. We provide recommendations on future research needs and directions for sustainable management of H. armigera, under a framework that includes consideration of intra.-specific variation for host use relevant in this and other similar pest species. (C) 2004 Elsevier Ltd. All rights reserved.

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Despite the evidence of greater fatigability of the cervical flexor muscles in neck pain patients, the effect of unilaterality of neck pain on muscle fatigue has not been investigated. This study compared myoelectric manifestations of sternocleidomastoid (SCM) and anterior scalene (AS) muscle fatigue between the painful and non-painful sides in patients with chronic unilateral neck pain. Myoelectric signals were recorded from the sternal head of SCM and the AS muscles bilaterally during sub-maximal isometric cervical flexion contractions at 25% and 50% of the maximum voluntary contraction (MVC). The time course of the mean power frequency, average rectified value and conduction velocity of the electromyographic signals were calculated to quantify myoelectric manifestations of muscle fatigue. Results revealed greater estimates of the initial value and slope of the mean frequency for both the SCM and AS muscles on the side of the patient's neck pain at 25% and 50% of MVC. These results indicate greater myoelectric manifestations of muscle fatigue of the superficial cervical flexor muscles ipsilateral to the side of pain. This suggests a specificity of the effect of pain on muscle function and hence the need for specificity of therapeutic exercise in the management of neck pain patients. (C) 2003 European Federation of Chapters of the International Association for the Study of Pain. Published by Elsevier Ltd. All rights reserved.

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The ataxia-telangiectasia mutated (ATM) protein kinase is activated in response to ionizing radiation (IR) and activates downstream DNA-damage signaling pathways. Although the role of ATM in the cellular response to ionizing radiation has been well characterized, its role in response to other DNA-damaging agents is less well defined. We previously showed that genistein, a naturally occurring isoflavonoid, induced increased ATM protein kinase activity, ATM-dependent phosphorylation of p53 on serine 15 and activation of the DNA-binding properties of p53. Here. we show that genistein also induces phosphorylation of p53 at serines 6, 9, 20,46, and 392, and that genistein-induced accumulation and phosphorylation of p53 is reduced in two ATM-deficient human cell lines. Also, we show that genistein induces phosphorylation of ATM on serine 1981 and phosphorylation of histone H2AX on serine 139. The related bioflavonoids, daidzein and biochanin A, did not induce either phosphorylation of p53 or ATM at these sites. Like genistein, quercetin induced phosphorylation of ATM on serine 198 1, and ATM-dependent phosphorylation of histone H2AX on serine 139; however, p53 accumulation and phosphorylation on serines 6, 9, 15, 20, 46, and 392 occurred in ATM-deficient cells, indicating that ATM is not required for quercetin-induced phosphorylation of p53. Our data suggest that genistein and quercetin induce different DNA-damage induced signaling pathways that, in the case of genistein, are highly ATM-dependent but, in the case of quercetin, may be ATM-dependent only for some downstream targets. (C) 2003 Elsevier B.V. All rights reserved.

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Over the past decade the various triptan derivatives have been accepted as the most effective available agents for relieving migraine attacks. Prior to that, for a period of half a century, ergotamine was the only 'specific' available for this purpose. In 1918, Stoll had isolated it from the various alkaloids present in extracts of the sclerotia of the fungus Claviceps purpurea (ergot), which grow on rye and, to a lesser extent, on other grasses. By 1925 ergotamine was beginning to be used to treat migraine attacks. However, as ergotamine was present in extracts of ergot, which had been used to treat migraine first, In Italy in 1862, and then by Edward Woakes (11868) in England, and after him by Albert Eulenburg in Germany (1883), the drug had actually come into unrecognised use for the disorder more than half a century before ergotamine itself was known to exist. Unfortunately, because of ergotamine's chemical and pharmacokinetic properties, extracts of ergot of rye were incapable of producing consistent therapeutic results, so that general acceptance that the first specific substance for migraine treatment existed had to wait until pure ergotamine was available for administration. (C) 2003 Elsevier Ltd. All rights reserved.

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Purpose: Persistent infection of cervical epithelium with high risk human papillomavirus (HPV) results in cervical intraepithelial neoplasia (CIN) from which squamous cancer of the cervix can arise. A study was undertaken to evaluate the safety and immunogenicity of an HPV 16 immunotherapeutic consisting of a mixture of HPV16 E6E7 fusion protein and ISCOMATRIX(TM) adjuvant (HPV16 Immunotherapeutic) for patients with CIN. Experimental design: Patients with CIN (n = 3 1) were recruited to a randomised blinded placebo controlled dose ranging study of immunotherapy. Results: Immunotherapy was well tolerated. Immunised subjects developed HPV16 E6E7 specific immunity. Antibody, delayed type hypersensitivity, in vitro cytokine release, and CD8 T cell responses to E6 and E7 proteins were each significantly greater in the immunised subjects than in placebo recipients. Loss of HPV16 DNA from the cervix was observed in some vaccine and placebo recipients. Conclusions : The HPV16 Immunotherapeutic comprising HPV16E6E7 fusion protein and ISCOMATRIX(TM) adjuvant is safe and induces vaccine antigen specific cell mediated immunity. (C) 2004 Elsevier Ltd. All rights reserved.

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We examined the potential role of SMAD7 in human epidermal keratinocyte differentiation. Overexpression of SMAD7 inhibited the activity of the proliferation-specific promoters for the keratin 14 and cdc2 genes and reduced the expression of the mRNA for the proliferation-specific genes cdc2 and E2F1. The ability of SMAD7 to suppress cdc2 promoter activity was lost in transformed keratinocyte cell lines and was mediated by a domain(s) located between aa 195-395 of SMAD7. This domain lies outside the domain required to inhibit TGFbeta1 signaling, suggesting that this activity is mediated by a novel functional domain(s). Examination of AP1, NFkappaB, serum response element, Gli, wnt, and E2F responsive reporters indicated that SMAD7 significantly suppressed the E2F responsive reporter and modestly increased AP1 activity in proliferating keratinocytes. These data Suggest that SMAD7 may have a role in TGFbeta-independent signaling events in proliferating/undifferentiated keratinocytes. The effects of SMAD7 in differentiated keratinocytes indicated a more traditional role for SMAD7 as an inhibitor of TGFbeta action. SMAD7 was unable to initiate the expression of differentiation markers but was able to superinduce/derepress differentiation-specific markers and genes in differentiated keratinocytes. This latter role is consistent with the ability of SMAD7 to inhibit TGFbeta-mediated suppression of keratinocyte differentiation and suggest that the opposing actions of SMAD7 and TGFbeta may serve to modulate squamous differentiation. (C) 2004 Elsevier Inc. All rights reserved.