排序方式： 共有9条查询结果，搜索用时 46 毫秒
1
1.
The Growth of Red Beet and its Infection by Streptomyces spp. 总被引：1，自引：1，他引：0
2.
3.
The economic problems of private forestry are intimately boundup with those of the State and the supporting industries. With the aim of becoming 25 per cent self-supporting, and tocreate a U.K. industry with overall efficiency, competitiveby world standards, a national forest is proposed of 7 millionacres with a minimum annual planting programme of 120,000 acres.This could be achieved 60 per cent by the State and 40 per centby private interests. Eight full-scale fully integrated sawmills, pulp, paper, andparticle board mills will be required for each 1 million acresof coniferous forests. The industries should be situated locallyto the forests, to draw timber supplies from a radius of notmore than 30 miles, and with the provision of adequate internaland external roads. To maintain confidence in a long-term industry there is theneed for continued Government support. If the private sectoris to play its part there must be no change in the grant aidsystem and the helpful tax structure. For efficiency in the forest there must be careful investmentplanning and choice of site, improved management, silviculture,harvesting and marketing techniques, increased specializationof men and machines, and a proper integration of forestry, agriculture,sporting, fishing, and public amenity. 相似文献
4.
The Effects of Surgical Isolation and Application of Polypropylene Spiral Prostheses on Tracheal Blood Flow 总被引：1，自引：0，他引：1
BARBARA M. KIRBY dvm ms DALE E. BJORLING dvm ms Diplomate acvs JOHN H. G. RANKIN PhD TERRANCE M. PHERNETTON ms 《Veterinary surgery : VS》1991,20(1):49-54
Tracheal blood flow before and after division of the segmental tracheal blood supply with and without application of a polypropylene spiral prosthesis was measured in dogs by radiolabeled microsphere injection. Ischemia of the central part of the trachea, from the mid-cervical to mid-thoracic regions, was observed immediately after division of the segmental tracheal blood supply with and without polypropylene spiral prosthesis application. On day 3, tracheal blood flow was significantly decreased in the central part of the trachea with and without polypropylene spiral prosthesis application. On day 7, tracheal blood flow was significantly increased throughout the trachea, with no significant differences between animals with and without prosthesis application. There was no evidence of a collateral source of blood supply to the trachea. Surgical division of the segmental tracheal blood supply of the trachea. Surgical division of the segmental tracheal blood supply of the entire trachea is not recommended. 相似文献
5.
6.
7.
8.
9.
1