Citric acid enhancement of copper solubility and toxicity in bicarbonate solutions

Copper solubility and cupric ion toxicity to photosynthesis of isolated chloroplasts and algal cells in bicarbonate solutions were enhanced by the addition of citric acid. The toxicity of cupric ions to algal growth during the first 2 days of incubation was increased by the presence of citric acid in the growth medium. No adverse effects of citric acid on cupric sulfate as an algicide were detected. Sulfhydryls were oxidized in the presence of cupric ions to disulfides with one mole of oxygen taken up for every 4 mol of sulfhydryls oxidized. In bicarbonate solutions, this reaction was stimulated by the addition of citric acid. A four to one ratio of citric acid to cupric sulfate pentahydrate on a weight to weight basis, 5.2 mol citric acid per mol copper, appeared to be the most efficient ratio. The citric acid influence on copper solubility and cupric ion toxicity was not due to a pH effect.     

2019年度新疆阿克苏细绒棉棉结和短纤维率分析

测试分析了2019年度阿克苏地区抽检的130批次（机采棉57批次，手摘棉73批次）细绒棉的棉结和短纤维率，并将手摘棉和机采棉进行分类比较。手摘棉与机采棉平均每克纤维棉结数分别为194、240，平均每克籽屑棉结数分别为39、46，平均每克棉结数分别为234、286；12.7 mm短纤维率主要分布在8%～12%，手摘棉在该范围的占比为61%，机采棉仅为36.8%；16 mm短纤维率主要分布在12%～18%，手摘棉在该范围的占比为76.7%，机采棉仅为59.7%。可知，2019年度阿克苏地区手摘棉棉结数和短纤维率均优于机采棉。     

TTI交联聚乙烯醇木材胶黏剂的研究

研究在水基中三苯基甲烷-4,4',4"-三异氰酸酯(TTI)交联聚乙烯醇(PVA)所形成的白色乳胶。采用正交试验法探讨聚乙烯醇、催化剂-x、TTI的加入量、反应时间及反应温度对该乳胶性能的影响。合成的单组份环保乳胶适用于木材、纸品等加工业,以及建筑业。     

Comparison of Pioneer and Native Woodland Species Growing on Top of an Engineered Landfill,Hong Kong: Restoration Programme

This study dealt with a restoration project conducted at South‐East New Territories Landfill in Hong Kong, in order to screen suitable tree and shrub species (both native and pioneer species) for revegetation. For engineered landfills, landfill gas migration and leachate contamination to the topsoil are rarely problematic, but the lack of nutrients and moisture and poor physical soil conditions may jeopardize potential woodland establishment. The growth performance of 25 woody plant species subjected to 12 different soil amelioration and seedlings planting methods was compared. The results showed that the general performance (mortality rate, apical height, crown diameter and basal diameter) of pioneer species (notably Acacia species) was much better than that of native species in all blocks of woodland mix and scrub mix. The notch planting method was effective in helping seedling roots to have better contact with soil for water uptake, which subsequently increased the survival rates of seedlings, leading to a better tree coverage. Soil ameliorations (horticultural soil with fertilizer and horse and pig manure) generally increased the seedling survival rate and improved plant growth. Tree coverage on all the plant trial blocks was mainly established by the three Acacia species. A planting distance of 1 m was recommended for woodland establishment, and such dense seedlings planting would achieve a better tree coverage under a shorter period of time (than the distance of 3 m). Difficulties in woodland establishment were discussed, and the strategies for achieving a better tree growth were recommended. Copyright © 2015 John Wiley & Sons, Ltd.     

胡麻类作物收获机具的研制

胡麻是山西省的主要油料作物,也是当地农民收入的主要经济作物之一。针对胡麻的传统收割和其场上碾压脱粒,新研制开发出4GL-160型胡麻收割机和5TF-45型谷黍杂粮脱粒机。主要论述4GL-160型收割机的一些特点和使用性能。     

Use of glargine and lente insulins in cats with diabetes mellitus

The goals of this study were to compare the efficacy of once-daily administered Glargine insulin to twice-daily administered Lente insulin in cats with diabetes mellitus and to describe the use of a high-protein, low-carbohydrate diet designed for the management of diabetes mellitus in cats. All cats with naturally occurring diabetes mellitus were eligible for inclusion. Baseline testing included a physical examination, serum biochemistry, urinalysis and urine culture, serum thyroxine concentration, and serum fructosamine concentration. All cats were fed the high-protein, low-carbohydrate diet exclusively. Cats were randomized to receive either 0.5 U/kg Lente insulin q12h or 0.5 U/kg Glargine insulin q24h. Re-evaluations were performed on all cats at weeks 1, 2, 4, 8, and 12, and included an assessment of clinical signs, physical examination, 16-hour blood glucose curve, and serum fructosamine concentrations. Thirteen cats completed the study (Lente, n = 7, Glargine, n = 6). There was significant improvement in serum fructosamine and glucose concentrations in all cats but there was no significant difference between the 2 insulin groups. Four of the 13 cats were in complete remission by the end of the study period (Lente, n = 3; Glargine, n = 1). The results of the study support the use of once-daily insulin Glargine or twice-daily Lente insulin in combination with a high-protein, low-carbohydrate diet for treatment of feline diabetes mellitus.