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S. Mignemi 《General Relativity and Gravitation》1998,30(12):1795-1801
We study a solution of the Einstein-Gauss-Bonnet theory coupled to a Maxwell field in five dimensions, whose euclidean continuation gives rise to an instanton describing black hole pair production. We also discuss the dual theory with a 3-form field coupled to gravity. 相似文献
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非天然氨基酸定点突变成功地应用在腺苷酸激酶上来研究其作用机理。一个苯丙氨酸的类似物和若干脯氨酸的类似物专一性地接入进腺苷酸激酶。对突变物的稳态动力学研究表明: 酪氨酸-95的芳香性在腺苷酸激酶的催化作用上不起非常重要的作用; 腺苷酸激酶能容耐脯氨酸-17的环变化为大的柔韧的环, 但却不能容耐小的刚硬的四元环。 相似文献
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杀虫植物苦皮藤毒杀成分的研究 总被引:33,自引:0,他引:33
从苦皮藤Celastrus angulatus Max.根皮中分离出5个对粘虫Mythimna separata (walker)具有毒杀活性的新化合物。经高分辨质谱和核磁共振谱鉴定其 结构为1α,2α,6β-三乙酰氧基-4β-羟基-8α-异丁酰氧基9β-呋喃甲酰氧 基-13-异戊酰氧基-β-二氢沉香呋喃(1),1α,2α,6β-二乙酰氧基-4 β-羟基8α,13-二异丁酰氧基-9β-苯甲酰氧基-β-二氢沉香呋喃(2), 1α,2α,6β-三乙酰氧基-4β-羟基-8α-β异丁酰氧基-9β-苯甲酰氧基 -13-异戊酰氧基-β-二氢沉香呋喃(3),1α,6β,8α,13-四乙酰氧基- 2α-羟基-9α-苯甲酰氧基-β-二氢沉香呋喃(4),1α,2α-二乙酰氧基 -4β,6β-二羟基-8β-异丁酰氧基9α-苯甲酰氧基-13-异戊酰氧基-β- 二氢沉香呋喃(5)。它们对5龄粘虫的致死中量LD50分别为91.4,271.5,168.8, 388.0和135.5μg/g。 相似文献
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Guoying Chee 《General Relativity and Gravitation》1998,30(12):1735-1748
Using the Dirac matrices the double self-dual and anti-self-dual structure of N=1 supergravity is discussed. It is shown that the (anti-)self-dual part of the curvature does not consist of the (anti-)self-dual part of the connection alone, and the (anti-)self-dual part of the Lagrangian quadratic in the curvature consists of the (anti-)self-dual part of the curvature alone only when the Lagrangian does not include torsion terms if the torsion of the spacetime does not vanish. Such a new Lagrangian is constructed. It includes no Einstein-Hilbert term but its self-dual part contains an Ashtekar term. 相似文献
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