926 resultados para Recycling textiles


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The reggie/flotillin proteins are implicated in membrane trafficking and, together with the cellular prion protein (PrP), in the recruitment of E-cadherin to cell contact sites. Here, we demonstrate that reggies, as well as PrP down-regulation, in epithelial A431 cells cause overlapping processes and abnormal formation of adherens junctions (AJs). This defect in cell adhesion results from reggie effects on Src tyrosine kinases and epidermal growth factor receptor (EGFR): loss of reggies reduces Src activation and EGFR phosphorylation at residues targeted by Src and c-cbl and leads to increased surface exposure of EGFR by blocking its internalization. The prolonged EGFR signaling at the plasma membrane enhances cell motility and macropinocytosis, by which junction-associated E-cadherin is internalized and recycled back to AJs. Accordingly, blockage of EGFR signaling or macropinocytosis in reggie-deficient cells restores normal AJ formation. Thus, by promoting EGFR internalization, reggies restrict the EGFR signaling involved in E-cadherin macropinocytosis and recycling and regulate AJ formation and dynamics and thereby cell adhesion.

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La literatura económica sobre los servicios municipales de residuos sólidos en España es muy escasa, aun cuando estos servicios han sido objeto d'intensas reformas organizativas y regulatorias. En esta investigación se estudia su estructura de costes con el objetivo de explicar la variabilidad entre los municipios de los costes soportados por el servicio. Se determina una función de costes y se estima de forma paramétrica. Los resultados del análisis empírico permiten estudiar la existencia de economías de escala con el output, y el efecto de algunos factores directamente asociados con el servicio como el grado de residuos selectivos, la frecuencia de recogida o la existencia de instalaciones de depósito en el municipio. Además, se analiza el impacto sobre los costes de otros factores como la densidad de población, los niveles salariales, la estacionalidad y la forma de producción, pública o privada.

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Crop species with the C4 photosynthetic pathway are more efficient in assimilating N than C3 plants, which results in different N amounts prone to be washed from its straw by rain water. Such differences may affect N recycling in agricultural systems where these species are grown as cover crops. In this experiment, phytomass production and N leaching from the straw of grasses with different photosynthetic pathways were studied in response to N application. Pearl millet (Pennisetum glaucum) and congo grass (Brachiaria ruziziensis) with the C4 photosynthetic pathway, and black oat (Avena Strigosa) and triticale (X Triticosecale), with the C3 photosynthetic pathway, were grown for 47 days. After determining dry matter yields and N and C contents, a 30 mm rainfall was simulated over 8 t ha-1 of dry matter of each plant residue and the leached amounts of ammonium and nitrate were determined. C4 grasses responded to higher fertilizer rates, whereas N contents in plant tissue were lower. The amount of N leached from C4 grass residues was lower, probably because the C/N ratio is higher and N is more tightly bound to organic compounds. When planning a crop rotation system it is important to take into account the difference in N release of different plant residues which may affect N nutrition of the subsequent crop.

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The “Iowa Innovators” series is a joint project of the Iowa Newspaper Association and the Iowa Department of Economic Development (IDED). The series is an outgrowth of an idea from member INA publishers. “Iowa Innovators” articles describe initiatives that Iowa communities have used to improve their ability to attract business and industry and demonstrate community innovation. The articles also describe Iowa companies on the leading edge of technology, business expansion, workforce development and recycling.

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Iowa’s Rail Environment Iowa’s rail transportation system provides both freight and passenger service. Rail serves a variety of trips, including those within Iowa and those to other states as well as to foreign markets. While rail competes with other modes, it also cooperates with those modes to provide intermodal services to Iowans. In 2009 Iowa’s rail transportation system could be described as follows: Freight Iowa’s 130,000-mile freight transportation system includes an extensive railroad network, a well-developed highway system, two bordering navigable waterways, and a pipeline network as well as air cargo facilities. While rail accounts for only 3 percent of the freight network, it carries 43 percent of Iowa’s freight tonnage. A great variety of commodities ranging from fresh fish to textiles to optical products are moved by rail. However, most of the Iowa rail shipments consist of bulk commodities, including grain, grain products, coal, ethanol, and fertilizers. The railroad network performs an important role in moving bulk commodities produced and consumed in the state to local processors, livestock feeders, river terminals and ports for foreign export. The railroad’s ability to haul large volumes, long distances at low costs will continue to be a major factor in moving freight and improving the economy of Iowa. Key 2008 Facts • 3,945 miles of track • 18 railroads • 49.5 million tons shipped • 39.7 million tons received • 2 Amtrak routes • 6 Amtrak stations • 66,286 rail passenger rides Key Rail Trends • slightly fewer miles being operated; • railroads serving Iowa has remained the same; • more rail freight traffic; • more tons hauled per car; • higher average rail rates per ton-mile since 2002; • more car and tons hauled per locomotive; and • more ton miles per gallon of fuel consumed. Iowa’s rail system and service has been evolving over time relative to its size, financial conditions, and competition from other modes.

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Tannery wastes generation is increasing every year and a suitable method for tannery sludge management is necessary in order to decrease this environmental problem. The composting is recognized as a suitable method for sludge recycling.. The effect of tannery sludge compost (TSC) rates on growth, nodulation and N fixation of cowpea was investigated. Sandy and clayey soils were amended with TSC at rates of 0, 7.5, 15, 30, and 60 t ha-1. The shoot dry weight of cowpea plants 45 days after emergence (DAE) was greater in the TSC-amended than in the unamended soil. In the sandy soil, nodule dry weight increased with TSC application 45 DAE. In the clayey soil, 45 DAE, nodule dry weight decreased with TSC amendment levels greater than 7.5 t ha-1 compared to the unamended control. The application of TSC increased N accumulation in the cowpea plants. The results suggest that cowpea responds differently to TSC depending on the amendment rate and initial soil type.

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As our nation’s highway system continues to age, asphalt maintenance and rehabilitation techniques have become increasingly important. The deterioration of pavement over time is inevitable. Preventive maintenance is a strategy to extend the serviceable life of a pavement by applying cost-effective treatments that slow the deterioration of pavement and extend its usable life. Thin maintenance surfaces (TMSs) are preventive maintenance techniques that can effectively prolong the life of pavement when applied at an opportune time. Common TMSs include bituminous fog seal, bituminous seal coat, slurry seal, cold in-place recycling (CIR), and micro-surfacing. This research project investigated ways to improve Iowa Statewide Urban Design and Specifications (SUDAS) and Iowa Department of Transportation (DOT) documents regarding asphalt roadway maintenance and rehabilitation. Researchers led an effort to review and help ensure that the documents supporting proper selection, design, and construction for asphalt maintenance and rehabilitation techniques reflect the latest research findings on these processes: seal coating, slurry sealing, micro-surfacing, and fog sealing. Full results of this investigation are included in this report and its appendices. This report also presents a summary of the recommendations based on the study results.

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Developed as a more detailed follow up at a 2009 briefing document,Building Sustainable Pavement with Concrete, this guide provides a clear, concise and cohesive discussion of pavement sustainability concepts and of recommended practices for maximizing the sustainability of concrete pavements. The intended audience includes decisions makers and practitioners in both owner-agencies and supply, manufacturing consulting and contractor businesses. Readers will find individual chapters with the most recent technical information and best practices related to concrete pavement deign, materials, construction, use/operations, renewal and recycling. In addition, they will find chapters addressing issues specific to pavement sustainability in the urban environment and to the evaluation of pavement sustainability.

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How the apical-basal axis of polarity is established in embryogenesis is still a mystery in plant development. This axis appeared specifically compromised by mutations in the Arabidopsis GNOM gene. Surprisingly, GNOM encodes an ARF guanine-nucleotide exchange factor (ARF-GEF) that regulates the formation of vesicles in membrane trafficking. In-depth functional analysis of GNOM and its closest relative, GNOM-LIKE 1 (GNL1), has provided a mechanistic explanation for the development-specific role of a seemingly mundane trafficking regulator. The current model proposes that GNOM is specifically involved in the endosomal recycling of the auxin-efflux carrier PIN1 to the basal plasma membrane in provascular cells, which in turn is required for the accumulation of the plant hormone auxin at the future root pole through polar auxin transport. Thus, the analysis of GNOM highlights the importance of cell-biological processes for a mechanistic understanding of development.

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Sustainable Concrete Pavements: A Manual of Practice is a product of the National Concrete Pavement Technology Center at Iowa State University’s Institute for Transportation, with funding from the Federal Highway Administration (DTFH61-06-H-00011, Work Plan 23). Developed as a more detailed follow-up to a 2009 briefing document, Building Sustainable Pavement with Concrete, this guide provides a clear, concise, and cohesive discussion of pavement sustainability concepts and of recommended practices for maximizing the sustainability of concrete pavements. The intended audience includes decision makers and practitioners in both owner-agencies and supply, manufacturing, consulting, and contractor businesses. Readers will find individual chapters with the most recent technical information and best practices related to concrete pavement design, materials, construction, use/operations, renewal, and recycling. In addition, they will find chapters addressing issues specific to pavement sustainability in the urban environment and to the evaluation of pavement sustainability. Development of this guide satisfies a critical need identified in the Sustainability Track (Track 12) of the Long-Term Plan for Concrete Pavement Research and Technology (CP Road Map). The CP Road Map is a national research plan jointly developed by the concrete pavement stakeholder community, including Federal Highway Administration, academic institutions, state departments of transportation, and concrete pavement–related industries. It outlines 12 tracks of priority research needs related to concrete pavements. CP Road Map publications and other operations support services are provided by the National Concrete Pavement Technology Center at Iowa State University. For details about the CP Road Map, see www.cproadmap. org/index.cfm.

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Hypomagnesemia and hypophosphatemia are frequent after severe burns; however, increased urinary excretion does not sufficiently explain the magnitude of the mineral depletion. We measured the mineral content of cutaneous exudates during the first week after injury. Sixteen patients aged 34 +/- 9 y (mean +/- SD) with thermal burns were studied prospectively and divided in 3 groups according to the extent of their burn injury and the presence or absence of mineral supplements: group 1 (n = 5), burns covering 26 +/- 5% of body surface; group 2 (n = 6), burns covering 41 +/- 10%; and group 3 (n = 5), burns covering 42 +/- 6% with prescription of magnesium and phosphate supplements. Cutaneous exudates were extracted from the textiles (surgical drapes, dressings, sheets, etc) surrounding the patients from day 1 to day 7 after injury. Mean magnesium serum concentrations decreased below reference ranges in 12 patients between days 1 and 4 and normalized thereafter. Phosphate, normal on day 0, was low during the first week. Albumin concentrations, normal on day 0, decreased and remained low. Urinary magnesium and phosphate excretion were within reference ranges and not larger in group 3. Mean daily cutaneous losses were 16 mmol Mg/d and 11 mmol P/d (largest in group 2). Exudative magnesium losses were correlated with burn severity (r = 0.709, P = 0.003). Cutaneous magnesium losses were nearly four times larger than urinary losses whereas cutaneous phosphate losses were smaller than urinary phosphate losses. Mean daily losses of both magnesium and phosphate were more than the recommended dietary allowances. Exudative losses combined with urinary losses largely explained the increased mineral requirements after burn injury.

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Despite the key importance of altered oceanic mantle as a repository and carrier of light elements (B, Li, and Be) to depth, its inventory of these elements has hardly been explored and quantified. In order to constrain the systematics and budget of these elements we have studied samples of highly serpentinized (>50%) spinel harzburgite drilled at the Mid-Atlantic Ridge (Fifteen-Twenty Fracture zone, ODP Leg 209, Sites 1272A and 1274A). In-situ analysis by secondary ion mass spectrometry reveals that the B, Li and Be contents of mantle minerals (olivine, orthopyroxene, and clinopyroxene) remain unchanged during serpentinization. B and Li abundances largely correspond to those of unaltered mantle minerals whereas Be is close to the detection limit. The Li contents of clinopyroxene are slightly higher (0.44-2.8 mu g g(-1)) compared to unaltered mantle clinopyroxene, and olivine and clinopyroxene show an inverse Li partitioning compared to literature data. These findings along with textural observations and major element composition obtained from microprobe analysis suggest reaction of the peridotites with a mafic silicate melt before serpentinization. Serpentine minerals are enriched in B (most values between 10 and 100 mu g g(-1)), depleted in Li (most values below I mu g g(-1)) compared to the primary phases, with considerable variation within and between samples. Be is at the detection limit. Analysis of whole rock samples by prompt gamma activation shows that serpentinization tends to increase B (10.4-65.0 mu g g(-1)), H2O and Cl contents and to lower Li contents (0.07-3.37 mu g g(-1)) of peridotites, implying that-contrary to alteration of oceanic crust-B is fractionated from Li and that the B and Li inventory should depend essentially on rock-water ratios. Based on our results and on literature data, we calculate the inventory of B and Li contained in the oceanic lithosphere, and its partitioning between crust and mantle as a function of plate characteristics. We model four cases, an ODP Leg 209-type lithosphere with almost no igneous crust, and a Semail-type lithosphere with a thick igneous crust, both at I and 75 Ma, respectively. The results show that the Li contents of the oceanic lithosphere are highly variable (17-307 kg in a column of I m x I m x thickness of the lithosphere (kg/col)). They are controlled by the primary mantle phases and by altered crust, whereas the B contents (25-904 kg/col) depend entirely on serpentinization. In all cases, large quantities of B reside in the uppermost part of the plate and could hence be easily liberated during slab dehydration. The most prominent input of Li into subduction zones is to be expected from Semail-type lithosphere because most of the Li is stored at shallow levels in the plate. Subducting an ODP Leg 209-type lithosphere would mean only very little Li contribution from the slab. Serpentinized mantle thus plays an important role in B recycling in subduction zones, but it is of lesser importance for Li. (C) 2008 Elsevier Ltd. All rights reserved.

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In a no-tillage system, cover crops must be used that combine shoot dry matter production and nutrient recycling. The aim of this study was to evaluate shoot dry matter production, decomposition rate and macronutrient and silicon release from pigeonpea and pearl millet in monoculture and intercropping systems. A randomized block design was used with a 3 x 6 factorial arrangement, with four replications. The first factor consisted of three cover crops (pigeonpea, pearl millet and intercropping of these cover crops) and the second consisted of six sampling times [0, 18, 32, 46, 74 and 91 days after desiccation (DAD)]. Pearl millet produced greater amounts of shoot dry matter and content of N, P, K, Ca, Mg, S, C and Si and had a higher decomposition rate and macronutrient and Si release than the other cover crops. The rates of decomposition and daily nutrient release from shoot dry matter were highest in the first period of evaluation (0-18 DAD). Over time, the C/N, C/P and C/S ratios increased, while C/Si and the decomposition rate decreased. Potassium was the nutrient most quickly released to the soil, especially from pearl millet residue. Silicon had the lowest release rate, with 62, 82 and 74 % of the total content in the shoot dry matter remaining in the last evaluation of pearl millet, pigeonpea and in the intercrop system, respectively. The shoot dry matter from the intercrop system had a different decomposition rate than that from the pearl millet monoculture and pigeonpea. Plants with greater shoot dry matter production and lower C/Si ratio are more effective in a no-tillage system for providing a more complete and persistent soil cover.

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RésuméLes champignons sont impliqués dans les cycles biogéochimiques de différentes manières. En particulier, ils sont reconnus en tant qu'acteurs clés dans la dégradation de la matière organique, comme fournisseurs d'éléments nutritifs via l'altération des minéraux mais aussi comme grands producteurs d'acide oxalique et de complexes oxalo-métalliques. Toutefois, peu de choses sont connues quant à leur contribution à la genèse d'autres types de minéraux, tel que le carbonate de calcium (CaCO3). Le CaCO3 est un minéral ubiquiste dans de nombreux écosystèmes et il joue un rôle essentiel dans les cycles biogéochimiques du carbone (C) et du calcium (Ca). Le CaCO3 peut être d'origine physico-chimique ou biogénique et de nombreux organismes sont connus pour contrôler ou induire sa biominéralisation. Les champignons ont souvent été soupçonnés d'être impliqué dans ce processus, cependant il existe très peu d'informations pour étayer cette hypothèse.Cette thèse a eu pour but l'étude de cet aspect négligé de l'impact des champignons dans les cycles biogéochimiques, par l'exploration de leur implication potentielle dans la formation d'un type particulier de CaCO3 secondaires observés dans les sols et dans les grottes des environnements calcaires. Dans les grottes, ces dépôts sont appelés moonmilk, alors que dans les sols on les appelle calcite en aiguilles. Cependant ces deux descriptions correspondent en fait au même assemblage microscopique de deux habitus particulier de la calcite: la calcite en aiguilles (au sens strict du terme cette fois-ci) et les nanofibres. Ces deux éléments sont des habitus aciculaires de la calcite, mais présentent des dimensions différentes. Leur origine, physico-chimique ou biologique, est l'objet de débats intenses depuis plusieurs années déjà.L'observation d'échantillons environnementaux avec des techniques de microscopie (microscopie électronique et micromorphologie), ainsi que de la microanalyse EDX, ont démontré plusieurs relations intéressantes entre la calcite en aiguilles, les nanofibres et des éléments organiques. Premièrement, il est montré que les nanofibres peuvent être organiques ou minérales. Deuxièmement, la calcite en aiguilles et les nanofibres présentent de fortes analogies avec des structures hyphales, ce qui permet de confirmer l'hypothèse de leur origine fongique. En outre, des expériences en laboratoire ont confirmé l'origine fongique des nanofibres, par des digestions enzymatiques d'hyphes fongiques. En effet, des structures à base de nanofibres, similaires à celles observées dans des échantillons naturels, ont pu être produites par cette approche. Finalement, des enrichissements en calcium ont été mesurés dans les parois des hyphes et dans des inclusions intrahyphales provenant d'échantillons naturels de rhizomorphes. Ces résultats suggèrent une implication de la séquestration de calcium dans la formation de la calcite en aiguilles et/ou des nanofibres.Plusieurs aspects restent à élucider, en particulier la compréhension des processus physiologiques impliqués dans la nucléation de calcite dans les hyphes fongiques. Cependant, les résultats obtenus dans cette thèse ont permis de confirmer l'implication des champignons dans la formation de la calcite en aiguilles et des nanofibres. Ces découvertes sont d'une grande importance dans les cycles biogéochimiques puisqu'ils apportent de nouveaux éléments dans le cycle couplé C-Ca. Classiquement, les champignons sont considérés comme étant impliqués principalement dans la minéralisation de la matière organique et dans l'altération minérale. Cette étude démontre que les champignons doivent aussi être pris en compte en tant qu'agents majeurs de la genèse de minéraux, en particulier de CaCO3. Ceci représente une toute nouvelle perspective en géomycologie quant à la participation des champignons au cycle biologique du C. En effet, la présence de ces précipitations de CaCO3 secondaires représente un court-circuit dans le cycle biologique du C puisque du C inorganique du sol se retrouve piégé dans de la calcite plutôt que d'être retourné dans l'atmosphère.AbstractFungi are known to be involved in biogeochemical cycles in numerous ways. In particular, they are recognized as key players in organic matter recycling, as nutrient suppliers via mineral weathering, as well as large producers of oxalic acid and metal-oxalate. However, little is known about their contribution to the genesis of other types of minerals such as calcium carbonate (CaCO3). Yet, CaC03 are ubiquitous minerals in many ecosystems and play an essential role in the biogeochemical cycles of both carbon (C) and calcium (Ca). CaC03 may be physicochemical or biogenic in origin and numerous organisms have been recognized to control or induce calcite biomineralization. While fungi have often been suspected to be involved in this process, only scarce information support this hypothesis.This Ph.D. thesis aims at investigating this disregarded aspect of fungal impact on biogeochemical cycles by exploring their possible implication in the formation of a particular type of secondary CaC03 deposit ubiquitously observed in soils and caves from calcareous environments. In caves, these deposits are known as moonmilk, whereas in soils, they are known as Needle Fibre Calcite (NFC - sensu lato). However, they both correspond to the same microscopic assemblage of two distinct and unusual habits of calcite: NFC {sensu stricto) and nanofibres. Both features are acicular habits of calcite displaying different dimensions. Whether these habits are physicochemical or biogenic in origin has been under discussion for a long time.Observations of natural samples using microscopic techniques (electron microscopy and micromorphology) and EDX microanalyses have demonstrated several interesting relationships between NFC, nanofibres, and organic features. First, it has shown that nanofibres can be either organic or minera! in nature. Second, both nanofibres and NFC display strong structural analogies with fungal hyphal features, supporting their fungal origin. Furthermore, laboratory experiments have confirmed the fungal origin of nanofibres through an enzymatic digestion of fungal hyphae. Indeed, structures made of nanofibres with similar features as those observed in natural samples have been produced. Finally, calcium enrichments have been measured in both cell walls and intrahyphal inclusions of hyphae from rhizomorphs sampled in the natural environment. These results point out an involvement of calcium sequestration in nanofibres and/or NFC genesis.Several aspects need further investigation, in particular the understanding of the physiological processes involved in hyphal calcite nucleation. However, the results obtained during this study have allowed the confirmation of the implication of fungi in the formation of both NFC and nanofibres. These findings are of great importance regarding global biogeochemical cycles as they bring new insights into the coupled C and Ca cycles. Conventionally, fungi are considered to be involved in organic matter mineralization and mineral weathering. In this study, we demonstrate that they must also be considered as major agents in mineral genesis, in particular CaC03. This is a completely new perspective in geomycology regarding the role of fungi in the short-term (or biological) C cycle. Indeed, the presence of these secondary CaC03 precipitations represents a bypass in the short- term carbon cycle, as soil inorganic C is not readily returned to the atmosphere.

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Comprend : [Bandeau folio Aij : allégorie de la Justice. Homme écrivant, singe. Ornements à la Bérin.] [Cote : Res Atlas V 117/Microfilm R 101257] ; [Pl.1 : de la mécanique à carder le coton. Vues et développements de la machine à carder le coton.] L'art du fabricant de velours de coton. [Cote : Res Atlas V 117/Microfilm R 101257] ; [Pl.2 : de la mécanique à carder le coton. Machine à carder le coton.] L'art du fabricant de velours de coton. [Cote : Res Atlas V 117/Microfilm R 101257] ; [Pl.3 : de la mécanique à carder le coton. Machine à carder le coton. Fig.4 : petits cadres en fer, implantés sur la charpente de la mécanique, sur lesquels s'appuie et tourne l'axe des cylindres.] L'art du fabricant de velours de coton. [Cote : Res Atlas V 117/Microfilm R 101257] ; [Pl.4 : de la mécanique à filer le coton et de la manière de s'en servir.] L'art du fabricant de velours de coton. [Cote : Res Atlas V 117/Microfilm R 101257] ; [Pl.5 : de la mécanique à filer le coton et de la manière de s'en servir.] L'art du fabricant de velours de coton. [Cote : Res Atlas V 117/Microfilm R 101257] ; [Pl.6 : fabrication du velours. Fig.1 : moulins à retordre les fils de coton, doublés pour la châine des velours] L'art du fabricant de velours de coton. [Cote : Res Atlas V 117/Microfilm R 101257] ; [Pl.7 : fabrication du velours. Fig.1 : vue perspective du métier monté et en travail.] L'art du fabricant de velours de coton. [Cote : Res Atlas V 117/Microfilm R 101257] ; [Pl.8 : fabrication du velours. Armure de piqué pour un carreau quatre points simple ou double, velours velvet-ret, croisé, piqué ou cannelé. Fig.8 : fabrication d'une toile sans lisière.] L'art du fabricant de velours de coton. [Cote : Res Atlas V 117/Microfilm R 101257] ; [Pl.9 : fabrication du velours. Le fourneau à brûler, griller ou raser les velours de coton et de la manière de faire cette opération.] L'art du fabricant de velours de coton. [Cote : Res Atlas V 117/Microfilm R 101257] ; [Pl.10 avec 3 vignettes : vignette 1, fabrication du velours. Des couleurs en bon teint. Atelier de teinture pour les coulers ordinaires, les garançages etc. Vignette 2 : atelier de teinture pour les cuves de bleu. Vignette 3 : atelier de teinture pour les tones de noir.] L'art du fabricant de velours de coton. [Cote : Res Atlas V 117/Microfilm R 101257] ; [Pl.11 : fabrication du velours. Des couleurs en bon teint. De la cuve du bleu à chaud. Mécanique à imprimer au cylindre les toiles, croisés, satinettes, velours de coton etc. Mécanique à découper les velours cannelés et le velvet-ret avec l'ouvrier vu en travail. ] L'art du fabricant de velours de coton. [Cote : Res Atlas V 117/Microfilm R 101257]