كمرجيا

الكيمرجيا Chemurgy استخدام منتجات المزارع والغابات كمصادر للمواد الخام للصناعات الكيميائية. اخترع هذا اللفظ وليام ج. هيل (1876-1955م). وهو متخصص في الكيمياء العضوية وعادة ما يسمى أبا الكيمرجيا. اكتشف هيل طرقًا كثيرة لإنتاج مواد كيميائية من المنتجات الزراعية.

تنقسم الكيمرجيا إلي ثلاثة مجالات للعمل: 1- إيجاد استخدامات جديدة لنباتات تمّت زراعتها سلفًا 2- إيجاد استخدامات لمنتجات المُخلَّفات 3- تطوير أنواع جديدة من النباتات للاستخدامات الصناعية.

نال العالم الأمريكي جورج واشنطن كارڤر شهرته لاكتشافه أكثر من 300 استخدام لأجزاء من نبات الفول السوداني .ولأعمال مشابهة في البطاطا الحلوة وشجرة الپيكان. كما أن السليلوز منتج زراعي له استخدامات عديدة. وينتج الحليب أكثر من 23 مليون كجم من المنتجات الفرعية سنويا، بالإضافة إلى فائدته كطعام. والجبن هو أشهر منتجات الحليب.

البزوغ

Chemurgy demonstrated its worth during World War II, particularly in alleviating the rubber shortage caused when Japan cut off most of America's supply. Corn was used as raw material in much of the synthetic rubber produced during the war.[1] Various other plants, including guayule and kok-saghyz (Russian dandelion), were investigated as rubber sources.[2] In the American Midwest, school children were encouraged to gather milkweed floss, previously considered a nuisance but now valued for a new role as a filler in military life jackets.[3][4] A priest in Iowa even made news by urging congregants to grow hemp, whose previous reputation as a drug hazard yielded to military requirements for rope and cordage.[citation needed]

الاضمحلال

The word "chemurgy" decreased in use by 1950.[5] By this point, the methods had yielded modest inroads to industry and research, including four national research laboratories, the development of the Southern pine industry, and the initial emergence of the American flax paper industry. After this time, awareness of the term as connoting a distinct set of industrial techniques faded, and the methods themselves did not spread further.[6]

Explanations for the decline vary. From a market perspective, the simplest explanation is substitution by fossil fuels, which proved cheaper for industrial production of many materials.[7] Beyond this, misaligned incentives and cultural aspects of the industry may have restrained investor enthusiasm and adoption by farmers. From an investment perspective, chemurgical projects often failed to move from pilot products to full-scale production. This leads some analysts to suggest that chemurgy disappointed too many investors in particular projects over time. Indeed, a related problem was in the industry's leadership and funding: a small number of private investors supplied the majority of the industry, and many decisions in it were guided by leadership personality conflicts in the small cadre of corporate-technocratic scientists in industry. This emphasis in the industry on the technological side may have dampened enthusiasm among farmers.[8] The leaders of the industry promoted rapid technological shifts in agricultural production, which was opposed by the more conservative uptake of new technologies in agriculture.[9] Finally, public programs aligned incentives against the industry. The New Deal provided immediate subsidies to farmers, whereas chemurgy as an industry required a longer-term program.[10][6]

Prospects for chemurgy appeared promising into the 1950s. An article in the December 3, 1951 issue of Newsweek, said "the flood of chemurgy seems to be swelling." But as uses of agricultural raw materials advanced, so did uses for petrochemicals, and non-renewable materials eventually won out in a number of markets. Petrochemical detergents were widely used in place of agriculturally derived soaps, and petrochemical plastic wrapping material largely replaced cellophane.[citation needed] The Chemurgic Council went through a period of decline and finally closed its doors in 1977.

In recent years, there has been a resurgence of interest in chemurgy, although the word itself has largely fallen out of usage.[11] In 1990, Wheeler McMillen then 97 years old, addressed a national conference of latter-day chemurgic enthusiasts in Washington, DC. The conference served to launch the New Uses Council, which seeks to further the cause formerly promoted by the Chemurgic Council.

George Washington Carver was one of the most famous scientists of this field. In the Environmental Biography of George Washington Carver titled "My Work is that of Conservation" author Mark D. Hersey writes, "Thus, although he accepted the honorary mantle of "the first and greatest chemurgist," he was hardly in its mainstream. On the contrary, Carver often misconstrued the movement's aims, imagining they fell more in line with his own than in fact they did. Because Carver had devoted his energies to improving the lives of impoverished black farmers, he saw chemurgy as a field in which science addressed "a great human problem." His 1936 injunction to "chemicalize the farm" sprang from his abhorrence of waste rather than a desire for profit, let alone an affinity for chemical pesticides and fertilizers. He wanted "waste products of the farm" to be used for making "insulating boards, paints, dyes, industrial alcohol, plastics of various kinds, rugs, mats and cloth from fiber plants, oils, gums and waxes, etc."[12]

أمثلة للبدائل

انظر أيضًا

الهامش

  1. ^ Songstad, D. D.; Lakshmanan, P.; Chen, J.; Gibbons, W.; Hughes, S.; Nelson, R. (2009). "Historical Perspective of Biofuels: Learning from the Past to Rediscover the Future". In Vitro Cellular & Developmental Biology. Plant. 45 (3): 190. doi:10.1007/s11627-009-9218-6. ISSN 1054-5476. JSTOR 20541026. S2CID 43292050. Retrieved 7 August 2022.
  2. ^ van Beilen, Jan B.; Poirier, Yves (January 2007). "Guayule and Russian Dandelion as Alternative Sources of Natural Rubber". Critical Reviews in Biotechnology. 27 (4): 217–231. doi:10.1080/07388550701775927. PMID 18085463. S2CID 7279687.
  3. ^ "The heroic milkweed". Christian Science Monitor. The Christian Science Publishing Society. 26 October 2008. Retrieved 2014-02-14.
  4. ^ Wykes, Gerald (4 February 2014). "A weed goes to war, and Michigan provides the ammunition". MLive Media Group (in الإنجليزية). Michigan History magazine. Retrieved 8 August 2022.
  5. ^ Beeman, Randal (1994). ""Chemivisions": The Forgotten Promises of the Chemurgy Movement". Agricultural History. 68 (4): 41. ISSN 0002-1482. JSTOR 3744668. Retrieved 8 August 2022.
  6. ^ أ ب Buck, Holly Jean (2019). After geoengineering : climate tragedy, repair, and restoration. London. pp. 55–57. ISBN 9781788730365.{{cite book}}: CS1 maint: location missing publisher (link)
  7. ^ Beeman, Randal (1994). ""Chemivisions": The Forgotten Promises of the Chemurgy Movement". Agricultural History. 68 (4): 42. ISSN 0002-1482. JSTOR 3744668. Retrieved 8 August 2022.
  8. ^ Buck, Holly Jean (2019). After geoengineering : climate tragedy, repair, and restoration. London. p. 56. ISBN 9781788730365.{{cite book}}: CS1 maint: location missing publisher (link)
  9. ^ Beeman, Randal (1994). ""Chemivisions": The Forgotten Promises of the Chemurgy Movement". Agricultural History. 68 (4): 42. ISSN 0002-1482. JSTOR 3744668. Retrieved 8 August 2022.
  10. ^ Pursell, Carroll (Autumn 1969). "The Farm Chemurgic Council and the United States Department of Agriculture, 1935-1939". Isis. 60 (3): 317. doi:10.1086/350500. JSTOR 229485. S2CID 144247472. Retrieved 7 August 2022.
  11. ^ Buck, Holly Jean (2019). After geoengineering : climate tragedy, repair, and restoration. London. pp. 56–57. ISBN 9781788730365.{{cite book}}: CS1 maint: location missing publisher (link)
  12. ^ Hersey, Mark (2011). My Work Is That of Conservation: An Environmental Biography of George Washington Carver. University of Georgia Press. p. 171. ISBN 978-0-8203-3965-8.
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