Interanimal "memory" transfer: results from brain and liver homogenates

Sixty mice received either shock or no shock in a shuttle box, or nonspecific stress in another apparatus. Brain and liver homogenates from these animals were then injected into 120 naive recipients, who were all tested in the shuttle box. Subjects receiving brain or liver from shocked or stressed donors had significantly higher latencies than control counterparts. These results are interpreted in terms of stress, rather than a memory transfer hypothesis.     

"Microsome" fraction of brain: structural changes induced by ascorbic acid

The usual vesicular configuration of membrane fragments in the brain "microsome" fraction is radically altered by treatment with ascorbic acid and adenosine monophosphate. Lightscattering measurements and electron micrographs show that the treated membranes assume predominantly planar forms. This change in structure appears to be contingent upon a continued transport of electrons from ascorbic acid.     

Comment on "Large-scale sequence analysis of avian influenza isolates"

Obenauer et al. (Research Articles, 17 March 2006, p. 1576) reported that the influenza A virus PB1-F2 gene is evolving under strong positive selection, as documented by an extremely high ratio of the number of nonsynonymous nucleotide substitutions to the number of synonymous substitutions (dN/dS). However, we show that this observation is likely to be an artifact related to the location of PB1-F2 in the +1 reading frame of the PB1 gene.     

"Hypersexuality" in male cats without brain damage

During 5 years of observation in a cat colony where mating tests are routinely conducted, the spontaneous occurrence of distortions of sexual activity in male cats has been recorded. Many of the behavioral patterns encountered have previously been described only in brain-damaged animals when they have been used as an index of "hypersexuality." Identical behavior occurs in normal males as a simple training effect.     

Nucleotide sequence of the "denaturable" leucine transfer RNA from yeast

The nucleotide sequence of " denaturable"leucine acceptor transfer RNA (tRNA(Leu)(3)) from baker's yeast was determined on (32)P-labeled material. The molecule is 85 nucleotides long and can be folded into the "cloverleaf" model for secondary structure. The basis on which the sequence was deduced from the products of complete enzymatic digestion, prior to its unambiguous determination, is presented.     

作物-害虫-天敌三级营养系统对臭氧增加的响应

综述了臭氧增加对作物-害虫-天敌三级营养系统影响的研究进展,探讨了其未来研究方向,旨在为未来害虫的生物防治提供科学依据和预警。     

祁县小麦“3414”肥料效应试验报告

在祁县农业综合开发项目区古县镇东城村进行小麦"3414"肥料效应试验,通过试验获得了当地种植小麦最高产量的施肥量、最佳经济效益的施肥量,并且比较了不同施肥模型的推荐施肥效果。结果表明,一元方程和三元二次方程的推荐值大致相同,其中,三元二次模型最大施肥量为N 388.20 kg/hm2,P2O5190.18 kg/hm2,K2O77.11 kg/hm2;采用线性加平台的最大推荐量为N 288.416 kg/hm2,P2O5 291.637 kg/hm2,K2O120 kg/hm2,二者差距不大。因此,在"3414"试验中,采用一元方程拟合是对三元二次方程最好的补充和优化。     

Comment on "Widespread RNA and DNA sequence differences in the human transcriptome"

Li et al. (Research Articles, 1 July 2011, p. 53; published online 19 May 2011) reported large numbers of differences between DNA and messenger RNA in human cells, indicating unprecedented levels of RNA editing, and including sequence changes not produced by any of the known RNA editing mechanisms. However, common sources of systematic errors in high-throughput sequencing technology, which were not properly accounted for in this study, explain most of the claimed differences.     

‘玉人面’对碱胁迫的形态和生理响应

为探讨茶菊‘玉人面’对碱胁迫的耐受程度,采用营养液砂培方法,研究了不同浓度Na2CO3(0、10、30、50、70、90mmol·L-1)胁迫对植株形态、生理生化和光合生长的影响。结果表明:随着NaCO3胁迫浓度的增强,植株叶细胞膜透性(Cond)、丙二醛(MDA)含量增加;脯氨酸(Pro)含量、可溶性蛋白(SPC)含量上升,可溶性糖(SS)含量、超氧化物歧化酶(SOD)活性呈先升后降趋势,过氧化物酶(POD)持续升高;叶绿素含量(Chl)、净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)降低,胞间CO2浓度(Ci)先降后升;花序直径缩短,花序畸形率升高,花产量显著下降。Na2CO3胁迫显著抑制植株的生长,抑制程度随胁迫浓度提高而增强,茶菊‘玉人面’耐碱的极限浓度为50mmol·L-1。