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71.
Substance budgets of an upland catchment: the significance of atmospheric phosphorus inputs 总被引:1,自引:0,他引:1
1. Precipitation inputs and outflow stream outputs are presented for 1993 in an upland lake and catchment system on the Antrim Plateau, Northern Ireland. 2. Phosphorus, potassium, chloride and possibly sulphate behaved conservatively inputs were approximately balanced by outputs. Combined nitrogen outputs were very much less than inputs, whereas there was a net export of calcium, magnesium, sodium and silica from the catchment. 3. Precipitation phosphorus inputs (22 kg P km?2yr?1) are compared with literature data and are shown to be near the median value. 4. The phosphorus budget is discussed in relation to the fact that there are few oligotrophic lakes in Northern Ireland. It is suggested this is due to the rainfall inputs, low phosphorus retention by the catchment and rapid flushing rates in the lakes. 相似文献
72.
广西十万大山植绥螨三新种(蜱螨亚纲:植绥螨科) 总被引:1,自引:0,他引:1
本文记述了从广西十万大山采用的植绥螨科3新种:广西盲走螨,似沿海盲走螨和三角钝绥螨。本文描述中的测量长度单位为μm,模式标本保存于广东省昆虫研究所。 相似文献
73.
74.
PSⅡ反应中心D1蛋白的小肽抗体的制备和鉴定 总被引:7,自引:3,他引:4
用人工合成的PSⅡ反应中心D1蛋白中(229~240)的12肽,与牛血清白蛋白偶联后做为抗原免疫家兔, 获得抗菠菜D1蛋白抗体. 免疫双扩散法测得其具较高的效价,蛋白印迹检测结果显示该抗体仅与D1蛋白有免疫亲和反应. 表明此抗体可作为检测D1蛋白及其光抑制时降解产物的探针. 相似文献
75.
以双引物法对葡萄糖异构酶(GI)基因进行定点突变,将突变体基因于大肠杆菌中表达,获得了GI双点突变体GIK253RA198C.研究K253R和A198C双点突变对GI的结构和性质的作用,结果表明GIK253RA198C的热稳定性明显下降,最适反应温度降低5℃.文章从结构和机制上解释了为何同是K253R突变,对SM33 GI和密苏里游动放线菌GI的热稳定性产生不同的影响,认为这是由于Lys253在两种GI结构的位置上存在微小差异,从而使引入的Arg对亚基间的相互作用产生了相反效应所引起. 相似文献
76.
To reveal how the matching models of the left ventricle and its afterload affect the pressure and flow in the aortic root, the differences between the measured pressure and flow waveforms and those determined by three kinds of matching model were compared. The results showed that, compared with the results by both matching models 1 and 2, the pressure and flow waveforms determined by matching model 3 established in this work were in the closest agreement with the corresponding experimental waveforms, therefore indicating that matching model 3 was a matching model that closely and rationally characterized the match between the left ventricle and the systemic artery. 相似文献
77.
YANG Jianbo WU Lijun LI Li WU JiadaoYU Zengliang XU Zhihong 《中国科学:生命科学英文版》1997,40(1):107-112
While M13mp18 double-stranded DNA was irradiated with ion beam, and transfected intoE. coli JM103, a decrease of transfecting activity was discovered. The lacZ- mutation frequency at 20% survival could reach (3.6–16.8) × 104, about 2, 3–10 times that of unirradiated M13DNA. Altogether, 27 IacZ-mutants were selected, 10 of which were used for sequencing. 7 of the sequenced mutants show base changes in 250-bp region
examined (the remaining 3 mutants probably have base changes outside the regions sequenced). 5 of the base-changed mutants
contain more than one mutational base sites (some of them even have 5–6 mutational base sites in 250-bp region examined);
this dense distribution of base changes in polysites has seldom been seen in X-rays, Y-rays or UV induced DNA mutations. Our
experiments also showed that the types of base changes include transitions(50%), transversions (45%) and deletion (5%); no
addition or duplication was observed. The transitions were mainly C→T and A→G; the transversions were mainly C→A and C→G.
The mutations involving cytosine residue (in the template strand) constitute about 60% of all the base changes observed. In
comparison with the surrounding sequences of mutational base sites, the base located between TG and CT is found to be easily
substituted. 相似文献
78.
昆虫神经毒素的研究:各种神经毒剂引起毒素的产生 总被引:2,自引:1,他引:1
用五类(七种)神经毒性的杀虫药剂,对美洲(虫非)蠊测定了它们能否引起血淋巴中毒素的产生。DDT、溴氰菊酯及六六六均能引起血淋巴中毒素的产生,而E605、西维因、巴丹及杀虫脒均无此效果。纸层析及薄层层析,用标准样品(酪氨酸、酪胺、苯乙胺、L-亮氨酸及异戊胺)作比较,测定了这一产生的血淋巴中的毒素乃是酪胺,或主要是酪胺。增效试验,证明了杀虫脒与DDT或溴氰菊酯合用时,能增加酪胺的产量。讨论了这一毒素产生的条件,以及这一毒素有可能不是单一成分,而是几种单胺及氨基酸的复合物,但酪胺为其主要成分。 相似文献
79.
80.
Among 114 fungi isolated from 20 dry shrimp samples, 27 isolates were capable of producing mycotoxins. Aspergillus and Penicillium were-the-predominant fungi. Two of 3 Aspergillus flavus could produce aflatoxin B1 and G1 on yeast extract sucrose medium and on surface sterilized dry shrimps. For other toxigenic species, toxicity was found mostly in the chloroform extracts of cultures. Visibly mouldy dry shrimps had significantly higher moisture content than the non-mouldy ones. Most of the fungi were isolated from mouldy samples. 相似文献