81 research outputs found
Impacts de restrictions en eau d'irrigation sur les exploitations et les filiĂšres agricoles en Beauce
Beaucoup dâagriculteurs, comme les opĂ©rateurs des filiĂšres aval qui collectent ou transforment leur production, dĂ©pendent de l'irrigation. Or, dans de nombreuses rĂ©gions du monde, structurellement ou conjoncturellement, les ressources en eau disponibles dĂ©clinent et sont soumises Ă des contingentements de plus en plus sĂ©vĂšres. Cette Ă©tude vise Ă analyser les consĂ©quences de scĂ©narios de fortes baisses de la disponibilitĂ© en eau sur les stratĂ©gies des agriculteurs en termes de choix dâassolement et de mode de conduite et dâirrigation des cultures ainsi que lâeffet de ces stratĂ©gies sur lâorganisation de filiĂšres locales. Elle a Ă©tĂ© mise en oeuvre en France, dans la plaine de la Beauce, oĂč une forte proportion de l'agriculture est irriguĂ©e Ă partir d'une ressource souterraine soumise Ă un dispositif de gestion volumĂ©trique. LâĂ©valuation des impacts de restrictions dâeau sâappuie sur une analyse Ă©conomique des filiĂšres locales ainsi que sur des ateliers participatifs regroupant des agriculteurs et des opĂ©rateurs des unitĂ©s aval. Les rĂ©sultats montrent les effets de restrictions dâeau sur les choix dâassolement des agriculteurs, les volumes de production Ă lâĂ©chelle du territoire, les marges brutes des exploitations et les valeurs ajoutĂ©es des filiĂšres. / Many farmers, and the large set of downstream operators who depend on their farm products, have become depend-ent on irrigation. But, in many parts of the world, water resources are declining for structural or temporary reasons. Farmers have to reduce water consumption by growing crops with lower water requirement and apply optimal irri-gation strategies. The strategies they choose can have major consequences for downstream operators and local agro-industries. This paper analyzes the impacts and consequences of high water restrictions scenarios for farmers and the subsectors depending on their production. This approach was imple-mented in France, in the region of Beauce, where irrigation relies on groundwater use and on a volumetric management of the local aquifer. Scenarios based on two different levels of water availability reduction were assessed and strategies to face reduced water availability were analyzed for both farmers and downstream operators. The analysis was based on a technical diagnosis of the local organization, an eco-nomic analysis of value added, and participatory workshops including farmers, downstream operators and state repre-sentatives. Our analyses showed how farmers would adapt to water restriction and, depending on their choice of pro-duction, how their strategies could impact the volume of production at sub-regional level, the value added at subsec-tor level and could lead to competition between down-stream operators
Improving survival in recurrent medulloblastoma: earlier detection, better treatment or still an impasse?
Early detection of relapse has been advocated to improve survival in children with recurrent medulloblastoma. However, the prognostic factors and the longer term outcome of these patients remains unclear. Pattern of recurrences were analysed in three consecutive protocols of the Société Française d'Oncologie Pédiatrique (1985-91). A uniform surveillance programme including repeated lumbar puncture combined with computerized tomography (CT) or magnetic resonance imaging (MRI) scan was applied for all registered patients. Forty-six out of 116 patients had progressive or recurrent disease. The median time from diagnosis to recurrence was 10.5 months and 76% relapses occurred during the first 2 years. Seventeen patients had asymptomatic relapses that were detected by the surveillance protocol. Forty-one patients were treated at time of progression. Twenty-three responded to salvage therapy and 11 achieved a second complete remission. The median survival time after progression was 5 months (<1-41 months), and only two patients remained alive at time of follow-up. Length of survival is primarily related to some specific patterns of relapse (time from diagnosis to recurrence, circumstances of relapse, extent of relapse) and to the response to salvage therapy. No evidence of long-term benefit appeared from any form of treatment
Excellent prognosis of late relapses of ETV6/RUNX1-positive childhood acute lymphoblastic leukemia: lessons from the FRALLE 93 protocol
Adverse outcome of infants with metastatic neuroblastoma, MYCN amplification and/or bone lesions: results of the French Society of Pediatric Oncology
To assess the relevance of MYCN amplification and bone lesions in stage 4 neuroblastoma (NB) in infants aged <1 year, 51 infants with stage 4 NB were enrolled. Three groups of patients were defined according to the type of metastases and the resectability of the primary tumour. Group I comprised 21 infants with radiologically detectable bone lesions, Group II 22 patients with an unresectable primary tumour and Group III eight patients with only metaiodobenzylguanidine (MIBG) skeletal uptake. MYCN oncogene content was assayed in 47/51 tumours and found to be amplified in 17 (37%). The 5-year event-free survival (EFS) rate of these 51 infants was 64.1% (± 7.1%). In a univariate analysis, bone lesions, MYCN amplification, urinary vanillylmandelic/homovanillic acid ratio and serum ferritin levels adversely influenced outcome. In the multivariate analysis, radiologically detectable bone lesions were the most powerful unfavourable prognostic indicator: the EFS rate was 27.2% for these infants compared to 90% for infants without bone lesions (P < 0.0001). Our data emphasize the poor prognosis of infants affected by stage 4 NB with bone lesions, especially when associated with MYCN amplification. Given the poor results in this group whatever the treatment, new therapeutic approaches need to be investigated in the future. © 2000 Cancer Research Campaig
Evolutions in estuary governance? Reflections and lessons from Australia, France and New Caledonia
Incidence and prognostic value of tumour cells detected by RTâPCR in peripheral blood stem cell collections from patients with Ewing tumour
To retrospectively evaluate the incidence of tumour cell contamination of peripheral blood stem cell (PBSC) collections and to correlate these data with the clinical outcome after high-dose chemotherapy (HDCT) with stem cell rescue in patients with a high-risk Ewing tumour. Peripheral blood stem cell collections obtained from 171 patients were analysed. Tumour contamination was assessed by reverse transcriptaseâpolymerase chain reaction (RTâPCR). The files of 88 patients who underwent HDCT followed by PBSC reinfusion were reviewed in detail, and their outcome compared to the PBSC RTâPCR results. Seven of 88 PBSC collections (8%) contained tumour cells as detected by RTâPCR. Peripheral blood stem cells were collected after a median of five cycles of chemotherapy. No clinical factor predictive of tumour cell contamination of PBSC harvest could be identified. Event-free survival (EFS) and overall survival (OS) of the whole study population were 45.3 % and 51.8 % at 3 years from the date of the graft, respectively. Forty-five patients relapsed with a median time of 15 months after graft, only four of whom had tumour cell contamination of the PBSC harvest. Tumour cell contamination of PBSC collection is rare and does not seem to be associated with a significantly poorer EFS or OS in this high-risk population
Quand "l&8217;eau, c&8217;est le lien" : suivre l&8217;évolution des réseaux d&8217;eau pour éclairer les pratiques et les transformations sociales dans les tribus kanak = When "water is a link" : following water networks evolution to analyze social transformations in the Kanak tribes
In New Caledonia, in the Kanak communities, "water is the link" ; the link between Heaven and Earth, between the Mountain and the Sea, but also between men and between clans. This article aims to show how the evolution of water networks management, from the "traditional" irrigation canals to the drinking water supply network, has transformed and still transforms uses of water in tribes and how these changes modify the links between men and tribe social organization. In the specific context of New Caledonian negotiated decolonization, focusing on techniques and technical changes around access and uses of the water show the impact of colonization and mining development on the management of the resource and on customary rules
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