THE ADSORPTION OF INOSITOL PHOSPHATES AND GLYCEROPHOSPHATE BY SOIL CLAYS, CLAY MINERALS, AND HYDRATED SESQUIOXIDES IN ACID MEDIA   总被引：1，自引：0，他引：1  

G. ANDERSON  E. Z. ARLIDGE 《European Journal of Soil Science》1962,13(2):216-224

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Rural Manufacturers' Characteristics and Probability of Plant Closings     

ROBERT ANDERSON  DAVID L. BARKLEY 《Growth and change》1982,13(1):2-8

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Mixed Signals in the Job Training Partnership Act     

KATHRYN H. ANDERSON  RICHARD V. BURKHAUSER  JENNIE E. RAYMOND  CLIFFORD S. RUSSELL 《Growth and change》1991,22(3):32-48

The Job Training Partnership Act of 1982 was developed to train the disadvantaged for work or better jobs. The Act that passed targeted the economically disadvantaged but stressed efficiency in the operation of the program. Program performance standards were established, and local Private Industry Councils (PICs) were developed to operate the program and to involve local business in JTPA training. Critics argued that this structure resulted in “creaming” of participants to the exclusion of the most disadvantaged workers. We test the “creaming” hypothesis using data on JTPA participants in Tennessee in 1987 and a sample of disadvantaged workers in Tennessee extracted from the Current Population Surveys. We find that racial and welfare targets are met but that the most able among those groups are chosen for help. We also find some evidence of “channeling.” The most disadvantaged groups are less likely to receive the most successful type of training — on-the-job training. Finally, we present alternative strategies to encourage PICs to do less “creaming,” and we make predictions about their likely success.  相似文献   

海拔对不同燕麦品种产量及品质的影响          下载免费PDF全文

宫玉霞  徐海  石红梅  李鹏霞  赵元芳  丁考仁青  祁红霞  姚铭  宋文  尕旦吉 《中国牛业科学》2019,45(2):9-11

[目的]品种和海拔是影响燕麦草产量和品质的重要因素,高产品种可以提高干草产量20%以上,而且茎叶比也不同,产量越高,叶量越丰富,其干草产量和品质均高。所以,不断进行品种比较试验,引进新品种,对燕麦草生产的效益影响重大。[方法]试验研究了不同品种的燕麦在不同海拔地区的产量及品质的差异。[结果]经研究,青海444在甘南州不同海拔地区表现出良好的适应性,林纳和加燕2号在低海拔区产量较高,但在高海拔地区的产量不及本地燕麦。从茎叶比和营养物质含量分析,林纳和加燕2号的茎叶比较高,ADF和NDF的含量较低,因此,其品质好于青海444和本地燕麦。[结论]综合考虑燕麦草产量与品质2个因素,在甘南州低海拔地区适合推广林纳和加燕2号,高海拔地区适合种植本地燕麦和青海444。  相似文献   

Mass larval mortalities in giant freshwater prawn, Macrobrachium rosenbergii de Man, cultured in Malaysian modified static'green water' systems     

I. G. ANDERSON  M. SHARIFF  G. NASH 《Journal of fish diseases》1990,13(2):127-134

Abstract. Repeated mass mortalities occurred in larval Macrobrachium rosenbergii de Man reared in modified static'green water' systems in two commercial hatcheries in Malaysia. Mean age of larval cultures at the time of mass mortalities was 164 days, or at larval stage 8 or 9. Gross signs, wet mount preparation pathology and/or histopathology revealed bacterial necrosis, midcycle larval disease-like and idiopathie muscle necrosis associated tissue changes, in some cases together with uncharacterised fungal infections. Strict attention to hatchery hygiene and the sanitary lot technique was effective in reducing the occurrence of mass larval mortalities.  相似文献   

A reo-like virus observed in the tiger prawn, Penaeus monodon Fabricius, from Malaysia     

M. NASH  G. NASH  I. G. ANDERSON  M. SHARIFF 《Journal of fish diseases》1988,11(6):531-535

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FRACTIONATION OF HUMIC ACID BY GEL PERMEATION CHROMATOGRAPHY     

H. A. ANDERSON  A. HEPBURN 《European Journal of Soil Science》1977,28(4):634-644

Humic acids from the L layer and B_2hhorizons of a humus-iron podzol were fractionated by gel permeation chromatography. Elution of the gel column with distilled water adjusted to pH 7.5 gave a fractionation based on both gel permeation and adsorption chromatography. This procedure gave filtered products containing most of the organic nitrogen, and an absorbed fraction. The latter contained most of the components which gave benzene carboxylic acids on oxidation of the humic acid with dilute nitric acid.  相似文献   

Phenolic and carbohydrate signatures of organic matter in soils developed under grass and forest plantations following changes in land use   总被引：1，自引：0，他引：1  

L.J. SANGER  J.M. ANDERSON  D. LITTLE  T. BOLGER 《European Journal of Soil Science》1997,48(2):311-317

Comparisons were made between the phenolic and carbohydrate signatures of soil profiles developed under grass, spruce and ash stands. Samples were collected from a brown earth soil which was originally under the same land use, but over the past 43 years has supported different monocultures. Distinct signatures associated with each litter type were recorded in individual profiles. A relatively undecomposed phenolic fraction from lignin and hydrolysable carbohydrate fraction from plants had accumulated in the soils under spruce and ash. This largely reflected the quantity and quality of the litter inputs from the spruce and ash compared with the grass. The phenolic and hydrolysable carbohydrate fractions accounted for as much as 60% of the total organic carbon concentration in the deep horizons. In the grassland profile both fractions were more decomposed than under ash and spruce suggesting that the forest profiles had rapidly accumulated a carbon pool with a comparatively slow rate of decomposition. This was most apparent from the spruce profile (which contained 398 mg g^?1 C carbohydrate hydrolysed using trifluoracetic acid (TFA) in the C horizon compared with 165 and 45 mg g^?1 C under ash and grass respectively). We conclude that the decay rate of these fractions is a function of the vegetation type.  相似文献   

欧拉羊种公羊适应性观察与杂交改良乔科羊繁殖力分析   总被引：1，自引：1，他引：0  

郭淑珍  牛小莹  格桂花  赵光平  才让闹日  王文飙  杨秀兰  张玉珍  张亚林  红卫东  马辉玉  尕旦吉 《畜牧兽医杂志》2011,30(1):15-17

欧拉羊引入甘南州大水种畜场和碌曲县尕海乡、郎木寺镇等地改良乔科羊的肉用性能,引入的欧拉羊种公羊行为表现正常,抗寒、抗病能力较强,发病率为7％以下,死亡率在3％以下。繁殖性能和生长发育良好,主要生理生化指标都在正常范围之内。欧拉羊杂交改良乔科羊的繁殖力分析结果表明,用欧拉羊杂交改良乔科羊试验组的母羊受胎率、繁殖率、羔羊成活率及繁殖成活率均比当地乔科羊本交对照组分别提高1．45％、1．07％、4．06％和4．71％。  相似文献   

欧拉羊与甘南山谷型藏羊杂交羔羊屠宰试验     

张海滨  马登录  郭淑珍  牛小莹  李保民  石少英  尕旦吉  赵君  张亚林  李春堂 《畜牧兽医杂志》2011,30(5):8-9

通过对欧山F1和山谷型藏羊羔羊进行屠宰试验,结果得出:9月龄欧山F1羔羊宰前平均活重为38.25 kg,比本地山谷型藏羊羔羊宰前平均活重高10.17 kg,差异极显著(P<0.01)。欧山F1羔羊胴体重和屠宰率分别为15.14 kg和39.58%,比对照组高4.58 kg(P<0.01)和1.96个百分点,差异极显著。欧山F1羔羊净肉率、后腿比例和腰肉比例分别为29.65%、38.18%和12.99%,高于山谷型藏羊4.01、7.78和2.68个百分点;欧山F1羔羊GR值和眼肌面积分别为8.23 mm和12.74 cm2,高于山谷型藏羊1.48 mm和4.38 cm2。  相似文献