本试验以泌乳期奶牛为试验对象,研究添喂5-羟基色氨酸、过瘤胃5-羟基色氨酸对奶牛产奶量及血浆激素的影响。根据年龄、胎次、泌乳日龄相近的原则选取30头健康的荷斯坦牛,随机分成3组,每组10头牛,分别为对照组、试验Ⅰ组、Ⅱ组。对照组...本试验以泌乳期奶牛为试验对象,研究添喂5-羟基色氨酸、过瘤胃5-羟基色氨酸对奶牛产奶量及血浆激素的影响。根据年龄、胎次、泌乳日龄相近的原则选取30头健康的荷斯坦牛,随机分成3组,每组10头牛,分别为对照组、试验Ⅰ组、Ⅱ组。对照组饲喂基础日粮(TMR),试验Ⅰ组和试验Ⅱ组分别在基础日粮的基础上添喂20g 5-HTP和48g RP 5-HTP;试验期45d,其中预试期15d,正试期30d;分别于正试期第0、10、20、30天的05:00、11:00和17:00时采集血样,测定产奶量。结果表明:与对照组相比,试验Ⅱ组在第20天产奶量提高20.8%,差异显著(P<0.05)。在05:00时,试验Ⅰ组血浆INS含量显著降低(P<0.05);试验Ⅱ组血浆INS含量极显著降低(P<0.01)。在11:00时,试验Ⅰ组血浆GH含量极显著提高(P<0.01),PRL含量极显著降低(P<0.01);试验Ⅱ组血浆GH含量显著提高(P<0.05),PRL含量极显著降低(P<0.01),INS含量显著降低(P<0.05)。在17:00时,试验Ⅱ组血浆PRL、GH含量极显著提高(P<0.01),INS含量极显著降低(P<0.01)。因此,添喂5-羟基色氨酸、过瘤胃5-羟基色氨酸能够提高奶牛产奶量,提高血浆中PRL、GH含量,并以过瘤胃5-HTP效果更好。展开更多
The propagation of elastic waves in magnetoelectroelastic grid structures is studied.Band gap properties are presented and the effects of the magnetoelectroelastic coupling and initial stress are considered.Numerical ...The propagation of elastic waves in magnetoelectroelastic grid structures is studied.Band gap properties are presented and the effects of the magnetoelectroelastic coupling and initial stress are considered.Numerical calculations are performed using the plane-wave expansion method.The results show that the band gap width can be tuned by the initial stress.It is hoped that our results will be helpful for designing acoustic filters with magnetoelectroelastic materials and grid structures.展开更多
Mono- and dual-branched molecules, { 4-[2-（4-benzothiazol-2-yl-phenyl）-vinyl]-phenyl}-（4-methoxy-phenyl）-phenyl- amine （BS1） and bis-{4-[2- （4-benzothiazol-2-yl-phenyl）-vinyI]-phenyl}-（4-methoxy-phenyI）-phen...Mono- and dual-branched molecules, { 4-[2-（4-benzothiazol-2-yl-phenyl）-vinyl]-phenyl}-（4-methoxy-phenyl）-phenyl- amine （BS1） and bis-{4-[2- （4-benzothiazol-2-yl-phenyl）-vinyI]-phenyl}-（4-methoxy-phenyI）-phenyl-amine （BS2）, are investigated with one- and two-photon static spectroscopy, and the femtosecond fluorescence up-conversion technique. The molecules show branch-based fluorescence emission at low quantum yield. U1trafast non-radiative decay on a picosecond time scale is found and is attributed to intramolecular charge-transfer bridged by the central triphenylamine. The two-photon absorption cross-sections of BS1 and BS2 are 19.1 and 19.4 GM, respectively.展开更多
文摘本试验以泌乳期奶牛为试验对象,研究添喂5-羟基色氨酸、过瘤胃5-羟基色氨酸对奶牛产奶量及血浆激素的影响。根据年龄、胎次、泌乳日龄相近的原则选取30头健康的荷斯坦牛,随机分成3组,每组10头牛,分别为对照组、试验Ⅰ组、Ⅱ组。对照组饲喂基础日粮(TMR),试验Ⅰ组和试验Ⅱ组分别在基础日粮的基础上添喂20g 5-HTP和48g RP 5-HTP;试验期45d,其中预试期15d,正试期30d;分别于正试期第0、10、20、30天的05:00、11:00和17:00时采集血样,测定产奶量。结果表明:与对照组相比,试验Ⅱ组在第20天产奶量提高20.8%,差异显著(P<0.05)。在05:00时,试验Ⅰ组血浆INS含量显著降低(P<0.05);试验Ⅱ组血浆INS含量极显著降低(P<0.01)。在11:00时,试验Ⅰ组血浆GH含量极显著提高(P<0.01),PRL含量极显著降低(P<0.01);试验Ⅱ组血浆GH含量显著提高(P<0.05),PRL含量极显著降低(P<0.01),INS含量显著降低(P<0.05)。在17:00时,试验Ⅱ组血浆PRL、GH含量极显著提高(P<0.01),INS含量极显著降低(P<0.01)。因此,添喂5-羟基色氨酸、过瘤胃5-羟基色氨酸能够提高奶牛产奶量,提高血浆中PRL、GH含量,并以过瘤胃5-HTP效果更好。
基金Supported by the National Natural Science Foundation of China under Grant Nos 11172084,11002045,10632020 and 10672017.
文摘The propagation of elastic waves in magnetoelectroelastic grid structures is studied.Band gap properties are presented and the effects of the magnetoelectroelastic coupling and initial stress are considered.Numerical calculations are performed using the plane-wave expansion method.The results show that the band gap width can be tuned by the initial stress.It is hoped that our results will be helpful for designing acoustic filters with magnetoelectroelastic materials and grid structures.
基金Supported by the National Natural Science Foundation of China under Grant Nos 60508011, 60878019, 10821062, 10934001, 60677002 and 10828407, and the National Basic Research Program of China under Grant Nos 2009CB930504, 2007CB307001, 2006CB921601 and 2006CB806007.
文摘Mono- and dual-branched molecules, { 4-[2-（4-benzothiazol-2-yl-phenyl）-vinyl]-phenyl}-（4-methoxy-phenyl）-phenyl- amine （BS1） and bis-{4-[2- （4-benzothiazol-2-yl-phenyl）-vinyI]-phenyl}-（4-methoxy-phenyI）-phenyl-amine （BS2）, are investigated with one- and two-photon static spectroscopy, and the femtosecond fluorescence up-conversion technique. The molecules show branch-based fluorescence emission at low quantum yield. U1trafast non-radiative decay on a picosecond time scale is found and is attributed to intramolecular charge-transfer bridged by the central triphenylamine. The two-photon absorption cross-sections of BS1 and BS2 are 19.1 and 19.4 GM, respectively.
