镉对菠菜生长影响的基因型差异研究   总被引：2，自引：0，他引：2  

鞠殿民  范丽颖  李景梅  金丽虹  葛建殚  冯耀勇  李程 《安徽农业科学》2009,37(4):1441-1442

[目的]研究菠菜对镉的吸收累积基因型差异及镉对菠菜生长的影响,为培育食用部位低镉积累的菠菜品种提供参考。[方法]选取16个品种,采用珍珠岩和蛭石混合培养法种植在镉含量为10mg／L的环境中,研究了镉吸收和积累对菠莱生长及新陈代谢的影响。[结果]结果表明,营养液中镉含量为10mg／L时,可以显著降低菠菜根部和地上部的干重、鲜重和总生物学产量,降低菠菜中叶绿素含量。经镉处理后,菠菜地上部镉含量为129．69～290．15μg／gDW,根部中镉含量为87．26～1487．67μg／gDW。地上部及根部镉含量和镉积累量基因型间存在显著差异。[结论]镉主要累积在菠菜的根部。  相似文献   

Squamous cell carcinoma of the rumen and thymic amyloidosis in a guanaco     

N H Altman  J D Small  R A Squire 《Journal of the American Veterinary Medical Association》1974,165(9):820-822

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Focal degeneration of the cornea with sequestration in a cat     

C D Knecht  A G Schiller  E Small 《Journal of the American Veterinary Medical Association》1966,149(9):1192-1193

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Effects of acute hypoxia on heat production capacity in newborn lambs     

F A Eales  J Small 《Research in veterinary science》1985,39(2):212-215

Severe hypoxia during birth results in a metabolic acidosis and depressed heat production capacity. The aetiology of the depressed heat production capacity is unknown. To investigate this problem newborn lambs were exposed to a 30 minute period of hypoxia by causing them to breathe room air diluted with nitrogen. Heat production capacity was subsequently estimated as summit metabolic rate. When summit metabolic rate was estimated at the end of the period of hypoxia a depression to 66 per cent of the control value was observed (P less than 0.01) but no depression was observed when the estimation of summit metabolic rate was delayed for 30 minutes. Hypoxia resulted in metabolic acidosis, hyperlactaemia and considerable increases in the plasma concentrations of adrenaline and noradrenaline. Summit metabolic rate was positively correlated with blood pH at the beginning of summit metabolism in lambs which had a pH value of less than 7.05. There were no other relationships between summit metabolic rate and blood composition. These results suggest that the poor heat production capacity found in lambs which have suffered hypoxia during birth may be directly related to acidaemia.  相似文献   

Effects of feeding ewe colostrum, cow colostrum or ewe milk replacer on plasma glucose in newborn lambs     

F A Eales  L Murray  J Small 《The Veterinary record》1982,111(20):451-453

The plasma concentration of glucose was monitored for six hours in lambs fed either ewe colostrum, cow colostrum or milk replacer by stomach tube at one hour of age. The feeding of ewe colostrum resulted in an elevation of the mean (+/- se) plasma glucose concentration from 2 . 6 +/- 0 . 3 mmol/litre before feeding to 7 . 3 +/- 0 . 92 mmol/litre three hours after feeding and this elevation was maintained. A similar rise was observed in the lambs fed cow colostrum but this was of shorter duration. A marked hyperglycaemia was observed after the feeding of milk replacer with a maximum value of 23 . 4 +/- 1 . 33 mmol/litre three hours after feeding. The practical implications of these results are discussed.  相似文献   

Causes of hypothermia in 89 lambs   总被引：1，自引：0，他引：1  

F A Eales  J S Gilmour  R M Barlow  J Small 《The Veterinary record》1982,110(6):118-120

The causes of hypothermia in 89 lambs were identified on the basis of history and clinical biochemistry. Excessive heat loss accounted for 24 per cent of the cases, and depressed heat production because of either severe hypoxia during birth, immaturity or starvation accounted for 72 per cent. Exhaustion of energy reserves and hypoglycaemia were marked characteristics of lambs which became hypothermic after 12 hours of age. Most of the lambs were either twins or triplets. The implications of the findings for both the treatment and prevention of hypothermia in newborn lambs are discussed.  相似文献   

Allelopathy in citrus orchards     

W.P. Burger  J.G.C. Small 《Scientia Horticulturae》1983,20(4):361-375

The involvement of allelopathy in citrus orchards is indicated by the discovery of a phenolic phytotoxin in soils and partly decomposed citrus root residues. The phytotoxin, which was tentatively identified as homovanillic acid, is produced by the anaerobic decomposition of citrus roots in the deeper soil horizons. It caused an arrest in rough lemon (Citrus jambhiri) radicle elongation and a severe swelling of the root tip.  相似文献   

胶合板生产的管理优化分析     

吕柳  居志键  叶小青  卢晓宁 《木材工业》2006,20(6):26-29

运用系统优化设计与决策理论及方法,针对目前我国胶合板企业的生产状况,对生产过程中的管理决策进行探讨.分析如何进行企业产品定位、质量跟踪及反馈;描述生产管理数据库的建立,提出了多种类型产品混合生产的优化管理模式及两种适合胶合板企业决策的方法.  相似文献   

Physical-chemical basis of lipid deposition in atherosclerosis   总被引：19，自引：0，他引：19  

D M Small  G G Shipley 《Science (New York, N.Y.)》1974,185(147):222-229

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Broiler embryo bone development is influenced by incubator temperature,oxygen concentration and eggshell conductance at the plateau stage in oxygen consumption1     

Dr E.O. Oviedo-Rondón  J. Small  M.J. Wineland  V.L. Christensen  P.S. Mozdziak  M.D. Koci 《British poultry science》2008,49(6):666-676

1. Four experiments were conducted to evaluate the effects of temperature (TEM) and oxygen (O₂) concentrations during the last 4 d of incubation on bone development. Fertile eggs from two strains were obtained that either exhibited Low or High eggshell conductance (G).

2. Four experimental cabinets provided either four TEM (36, 37, 38 or 39^°C) or four O₂ concentrations (17, 19, 21 or 23% O₂). Data were analysed as a 2 × 2 factorial design. In the fourth experiment, two temperatures (36 and 39^°C), two O₂ concentrations (17 and 23%) and the same Low and High G strains were evaluated in a 2 × 2 × 2 factorial design.

3. Body weights (BW) and residual yolks were obtained, both legs were dissected. Femur, tibia and shank weights, length and thickness were recorded. Relative asymmetry (RA) of each leg section was calculated.

4. The results indicated that elevated TEM during incubation increased RA between the two legs, mainly in the Low G strain. Chickens at the lowest O₂ concentrations had lighter and shorter tibias, lighter shanks, and increased RA of femur length compared to chickens in the 23% O₂. In the fourth experiment no interactions were observed between O₂ and TEM. High TEM depressed BW of Low G broilers, but no significant effect of treatments was observed on BW of High G broilers. Nevertheless, the high TEM or low O₂ independently caused reduced femur and tibia weights and length, shank length and thickness, and both low O₂ and high TEM together increased RA in shank weight.

5. These results suggest that late incubation conditions affect long bone development in broilers.  相似文献