tailieunhanh - Báo cáo toán học: "Anatomy and chemical composition of Pinus pinea L. bark"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Anatomy and chemical composition of Pinus pinea L. bark. | 479 Ann. For. Sci. 56 1999 479-484 Inra Elsevier Paris Original article Anatomy and chemical composition of Pỉnus pỉnea L. bark Elsa Nunesa Teresa Quilhób Helena Pereiraa Centro de Estudos Florestais Departamento de Engenharia Florestal Instituto Superior de Agronomia Universidade Técnica de Lisboa 1399 Lisboa Codex Portugal b Centro de Estudos de Tecnologia Florestal Instituto de Investigajao Cientifica Tropical 1399 Lisboa Codex Portugal Received 21 September 1998 accepted 23 March 1999 Abstract - The secondary phloem of Pinus pinea L. bark has sieve cells and axial and radial parenchyma but no fibres. Resin ducts are present in fusiform rays. Styloid crystals starch granules and tannins occur inside sieve and parenchyma cells. The rhytidome of p. pinea bark has a variable number of periderms forming scale-type discontinuous layers over expanded parenchyma cells. The phellem comprises two to four layers of thick-walled cells and the phelloderm a layer of two or three thin-walled cells with inclusions and sometimes a layer of expanded cells. Ash content of p. pinea bark is low and the pH is slightly acidic. Total extractives amount to and tannins to of . weight. Content of lignin and unhydrolysable phenolic acids is and of polysaccharides with the following monosaccharide composition glucose mannose xylose galactose and arabinose . Inra Elsevier Paris. Pinus pinea L. I bark I anatomy chemical composition Resume - Anatomie et composition chimique de récorce de Pinus pinea L. Le phloème secondaire de Pinus pinea L. contient des cellules criblées du parenchyme axial et radial mats pas de fibres. Les canaux resiniferes apparaissent dans les rayons fusiformes. Des cristaux styloides des granules d amidon et des tanins ont été observes dans les cellules criblées et le parenchyme. Le rhytidome renferme un nombre variable de péridermes qui forment des couches discontinues en écailles sur des cellules de parenchyme élargies. Le

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