氨基酸硒对露地栽培巨峰葡萄果实品质及叶片质量的影响

以4年生露地栽培巨峰葡萄(砧木为贝达)为试材,研究氨基酸硒对其果实品质和叶片质量的影响。结果表明,巨峰施用氨基酸硒处理后,有利于提高果实品质,果粒横径、纵径、单粒质量、可溶性糖、可滴定酸、Vc含量及SOD活性显著提高;改善叶片质量,栅栏组织厚度、海绵组织厚度、栅海比、叶片厚度、比叶重、叶绿素a、叶绿素a/b值、叶绿素b及叶绿素总量均显著增加。     

采用美拉德反应提高黄鲫蛋白抗菌肽的抑菌活性

以黄鲫蛋白抗菌肽(HAHp)为底物,通过美拉德反应提高其抑菌活性.以大肠杆菌为指示菌,在100℃水浴加热条件下,比较 HAHp-葡萄糖、HAHp-蔗糖、HAHp-麦芽糖和 HAHp-乳糖的美拉德反应物抑菌活性;选用葡萄糖为添加糖,测定 HAHp-葡萄糖美拉德反应初始 pH 值、加糖量、加热温度和加热时间对美拉德反应物的抑菌活性影响.结果表明:提高反应初始 pH 值(大于 pH6.0)会降低 HAHp 美拉德产物的抑菌活性,选择葡萄糖适宜加入量,控制加热温度和时间可以提高 HAHp-葡萄糖美拉德反应物对大肠杆菌的抑菌活性     

外源抗氧化剂对高温胁迫下红地球葡萄果皮组织CAT、APX和SOD酶活性的影响

以红地球葡萄为试材,喷施抗坏血酸(Vc)、苯甲酸钠(SBN)、水杨酸(SA)、柠檬酸(CA)、氯化钙(CaCl2)等5种抗氧化剂,研究不同外源抗氧化剂对高温胁迫下果皮组织中过氧化氢酶(CAT)、抗坏血酸过氧化物酶(APX)、超氧化物歧化酶(SOD)活性的影响。结果表明:喷施外源抗氧化剂均能显著提高果皮组织内CAT、APX和SOD的活性。综合分析:以Vc 10 mmol/L,SA 0.05 mmol/L,CA 10 mmol/L,Vc 10 mmol/L+CaCl21000 mg/L,Vc 10 mmol+SBN 10 mmol/L为极显著。     

A Universal Analytic Potential-Energy Function Based on a Phase Factor

Using a field equation with a phase factor, a universal analytic potential-energy function applied to the interactions between diatoms or molecules is derived, and five kinds of potential curves of common shapes are obtained adjusting the phase factors. The linear thermal expansion coefficients and Young‘s moduli of eleven kinds of fuce-centered cubic (fcc) metals - Al, Cu, Ag, etc. Are calculated using the potential-energy function; the computational results are quite consistent with experimental values. Moreover, an analytic relation between the linear thermal expansion coefficients and Young‘s moduli of fcc metals is given using the potential-energy function. Finally, the force constants of fifty-five kinds of diatomic moleculars with low excitation state are computed using this theory, and they are quite consistent with RKR (Rydberg-Klein-Rees) experimental values.     

Preparation of liposome-coated oligonucleotide labeled with 99mTc and its uptake in vascular smooth muscle cells

To explore the preparation method of liposome-coated 99mTc-labeled antisense oligonucleotide (ASON),targeteing the proliferating cell nuclear antigen (PCNA), and to explore the biological characteristics and the uptake kinetics of a radiolabeled probe in vascular smooth muscle cells, an 18-base single-stranded antisense oligonucleotide targeting PCNA mRNA and the complementary strand (sense oligonucleotide, SON) were synthesized. The ASON (SON) was labeled with 99mTc, by conjugating the bifunctional chelator (hydrazino nicotinamide, HYNIC), and purified through a gel filtration column of Sephadex G-25. The product was then encapsulated in cationic liposome (oligofectamineTM). The radiolabeling efficiency, radiochemical purity, stability of the liposome-coated 99mTc-HYNIC-ASON in a phosphate buffered solution (PBS), and fresh human serum and its uptake rate were studied. There was no significant difference between the 99mTc radiolabeling efficiencies of HYNIC-ASON and HYNIC-SON, which were 60.04% ± 1.92% and 59.60% ± 2.53%, respectively (P ＞ 0.05, n = 5). The radiochemical purity of the liposome-coated 99mTc-HYNIC-ASON was 94.70% ± 1.90% (n = 5). And after incubation with PBS and fresh human seAt 90 min after transfection, the uptake rate of the liposome-coated 99mTc-HYNIC-ASON reached its peak of 83.8% ±5.92% in vascular smooth muscle cells (VSMCs) and was much higher than that of the nonliposome-coated 99mTc-HYNIC-ASON, which was 11.16% ± 0.54% (P ＜ 0.01, n = 4). The labeling method of PCNA ASON (SON) conjugated by HYNIC has been proved successful. The liposome was able to enhance the ASON (SON) uptake in VSMCs,and could be widely used as a safe, convenient, effective gene transfer carrier.     

Research on Strategic Cooperation Between China Post and Telecoms

1IntroductionFacing the rapid development of social economy andscience technology China Post needs wide cooperation a-mong industries to gain competitive advantage and de-velopment space , which appeals the leading-edge tele-comindustry to become its partner .In some fields Chi-na Post and the Telecoms have launched business coop-eration which stays onlowlevel ,so for China Post it isurgent to establish relationship to the Telecoms onstrategiclevel presently,which will build win-winsitua-ti…     

STUDY ON BIOLEACHING OF PRIMARY CHALCOPYRITE ORE WITH THERMOACIDOPHILIC ARCHAE

1. Introduction There have been two difficulties encountered with the leaching of low-grade primary chalcopyrite oresusingmesophile culture-thiobacillusferrooxidans(Tf) and thiobacillusthiooxidans(Tt), and so on[1-3].The first is the poor leaching effect and the second is the resultant increase in temperature during the middle and the later phase ofheap-leachingperiod, which is unfavorable for the growth and the culture of Tf and Tt. Being widely used for mineral leaching at present, Tf and …     

焦煤价格上涨可能促使铁矿石价格上扬

铁矿石卖方确信 2001 年铁矿石谈判的结果将是价格上扬,原因是焦煤供应商已成功地提高了 2001 年焦煤供应价。今年日本的焦煤供应价平均上扬 8％,尽管北美焦煤商在欧洲的售价被大幅度压低,但其价格仍高于日本的市场价格。铁矿石供应商将不会期望铁矿石价格如焦煤价格在欧洲有相同的上涨,届时第 4 轮铁矿石价格谈判将在日本举行。据称,到目前为止,仅有里奥*廷托集团的哈默斯利公司在 2 月初第三轮谈判时,在日本提出的价格表上将价格提高 7.5%。尽管这一数字未被证实,但贸易商说该数字相当可靠。 （郑　英）     

涂层界面应力的数值解法

掌握涂层界面应力状态有助于涂层开发应用和提高其工作性能与使用寿命。将数学方法应用于应力应变分析,提出了一种高效、简便的界面应力算法。