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111.
为获得某金矿尾砂胶结充填材料最优配比,基于试验结果,以海水比例、灰砂比和料浆质量浓度为输入参数,以充填体强度、塌落度及泌水率为输出参数,建立了充填配比与其响应量的高斯过程回归模型,分析了不同因素对充填性能的影响程度;采用遗传算法对高斯过程回归模型进行多目标参数优化,获得了Pareto非劣解,在此基础上,引入多属性决策的TOPSIS法对Pareto非劣解进行方案优选,确定了充填最优配比。研究结果表明:高斯过程回归模型相对误差值均小于6%,可靠性高;灰砂比及料浆质量浓度对充填性能影响较为显著,采用海水作为充填水源将降低充填体的强度;经优化后的充填配比与试验结果相符。 相似文献
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115.
焦亚硫酸钠对大鼠背根节神经元钾电流的影响 总被引:2,自引:0,他引:2
应用全细胞膜片钳技术,研究SO2体内衍生物和食品添加剂———焦亚硫酸钠(sodiummetabisulfite,SMB)对大鼠背根节(DRG)神经元瞬间外向钾电流(TOCs)和延迟整流钾电流(IK)的影响.结果表明,SMB可增大TOCs和IK,且具剂量依赖性和电压依赖性.10μmolL-1的SMB不影响TOCs的激活过程,给药前后TOCs的半数激活电压为(3.15±2.29)mV和(4.72±1.92)mV(N=8,P>0.05),不改变其斜率;但10μmolL-1的SMB却非常显著地影响TOCs的失活过程,给药前后其半数失活电压分别为(-53.6±0.45)mV和(-38.85±0.68)mV(N=8,P<0.01),也不改变其斜率.10μmolL-1的SMB显著提前IK的激活过程,给药前后IK的半数激活电压为(-11.98±3.50)mV和(-33.21±5.67)mV(N=8,P<0.01),不改变其斜率.SMB显著增大TOCs和IK,使IK的激活过程提前,抑制TOCs的失活过程,从而导致细胞内K 通过K 通道外流增加,进而可能对DRG神经元功能产生不利影响.图6参16 相似文献
116.
有机磺酸类化合物的络合萃取研究 总被引:15,自引:0,他引:15
本文以三烷基胺为络合剂,正辛醇,煤油,氯仿,四氯化碳等为稀释剂,测定了络合萃取剂对于对甲基苯磺酸,磺基水杨酸稀溶液的相平衡分配系数,讨论了稀释剂,体系PH值和7301络合剂含量对萃取相平衡分配系数D值的影响,确定了形成的萃合物的组成。 相似文献
117.
Gita R. Kolluru Gregory F. Grether Heidy Contreras 《Behavioral ecology and sociobiology》2007,61(5):689-701
Food availability is expected to influence the relative cost of different mating tactics, but little attention has been paid
to this potential source of adaptive geographic variation in behavior. Associations between the frequency of different mating
tactics and resource availability could arise because tactic use responds directly to food intake (phenotypic plasticity),
because populations exposed to different average levels of food availability have diverged genetically in tactic use, or both.
Different populations of guppies (Poecilia reticulata) in Trinidad experience different average levels of food availability. We combined field observations with laboratory “common
garden” and diet experiments to examine how this environmental gradient has influenced the evolution of male mating tactics.
Three independent components of variation in male behavior were found in the field: courtship versus foraging, dominance interactions,
and interference competition versus searching for mates. Compared with low-food-availability sites, males at high-food-availability
sites devoted more effort to interference competition. This difference disappeared in the common garden experiment, which
suggests that it was caused by phenotypic plasticity and not genetic divergence. In the diet experiment, interference competition
was more frequent and intense among males raised on the greater of two food levels, but this was only true for fish descended
from sites with low food availability. Thus, the association between interference competition and food availability in the
field can be attributed to a genetically variable norm of reaction. Genetically variable norms of reaction with respect to
food intake were found for the other two behavioral components as well and are discussed in relation to the patterns observed
in the field. Our results indicate that food availability gradients are an important, albeit complex, source of geographic
variation in male mating strategies. 相似文献
118.
An orthogonally designed experiment was conducted to study the single and combined effects of N, P and K on phytoremediation of Cu-polluted soil by Indian mustard. Addition of fertilizer N and P significantly increased Indian mustard shoot yield. Two high treatments combined with N resulted in the highest yields, followed by low-P combined with N. In contrast, high P with no N gave no yield increase and K had no effect on yield of Indian mustard. Nitrogen and P increased the amount of chlorophyll in the leaves, indicating that the yield increases were due to enhanced photosynthesis. Nitrogen application had no effect on plant Cu concentrations but addition of P slightly decreased plant Cu concentrations, likely a dilution effect resulting from the increase in yield. Among the treatments, N and P applied at 100 and 200 mg kg–1 respectively with no K application resulted in the highest Cu uptake. Thus, a combination of low N and high P produced a yield increase in Indian mustard that was more than adequate to compensate for a slight decrease in Cu concentration, resulting in the highest Cu removal from the contaminated soil. 相似文献
119.
不同AM真菌对三叶草耐油性的影响 总被引:9,自引:0,他引:9
在盆栽条件下研究了4个油浓度(0、5000、10000和50000w/mgkg^-1)下接种辽河油田污染土壤中分离出的3种AM真菌(Glomus mosseae,G.geospora,G.constrictum)对三叶草耐油性的影响。试验结果表明:1)随着油浓度的增加,侵染率亦增加,10000mgkg^-1时G.geospora和G.constrictum的侵染率分别为67.65%和82.86%;2)从侵染率、地上部生物量和菌根依赖性来看,随着油浓度的增加,最适的AM真菌亦不一样,油浓度为0、5000和10000mgkg^-1时,最适AM真菌分别是G.geospora、G.mosseae和G.constrictum;3)油污染土壤上接种AM真菌能促进植株的地下部和地上部的生长,接菌处理的茎干重比相应的对照增加62.2%-267.1%;4)随着油浓度的增加和植物的生育进程,AM真菌的接种效应在增强。图3表3参14 相似文献
120.
环戊酮和环己酮的微生物降解途径、相关酶和基因研究进展 总被引:9,自引:0,他引:9
简略介绍了环戊酮和环己酮的应用及危害,综述了目前国内外在环戊酮和环己酮微生物降解方面的研究进展.具体介绍了环戊酮和环己酮降解代谢的过程及其相关的酶类和编码这些酶的基因,重点阐述了环戊酮1,2-单加氧酶和环己酮1,2-单加氧酶及其编码基因.图4参19 相似文献