Prevention of asthma

Infants born of allergic mothers but normal fathers, who had eczema and who were fed cows' milk, had a significantly greater incidence of asthma (P less than 0.001) than infants with a similar history but who were breast-fed. An analysis of all breast-fed infants in the study showed that they were less likely to develop asthma than those who were bottle-fed (P less than 0.06). There was a lower incidence of allergy in infants born of families with allergic mothers and normal fathers, than in families in which both parents were allergic (P less than 0.02). In skin tests of both breast or bottle-fed babies, the two most common allergens eliciting reactions were egg and cat dander.     

Malarial immunodepression in vitro: adherent spleen cells are functionally defective as accessory cells in the response to horse erythrocytes

The basis for the depressed response of malarial infected mice to horse red blood cells (HRBC) has been studied in vitro. Results presented show that the adherent spleen cells from infected mice (a) are defective in their ability to allow nonadherent spleen cells of both normal and infected mice to respond to HRBC whereas a response does occur with adherent spleen cells from normal mice (b) do not suppress the response of unfractionated spleen cells from normal mice to HRBC (c) contain phagocytic cells as measured by the uptake of neutral red in numbers which are of the same order of magnitude as in adherent spleen cells from normal mice, but which are unable to take up HRBC. We conclude that a splenic adherent cell, probably the macrophage is functionally defective as an accessory cell in the response to HRBC of mice infected with Plasmodium berghei yoelii.     

基于机器学习的异构感知多核调度方法

异构多核处理器已成为现代嵌入式系统的主流解决方案，而好的在线映射或调度方法对其充分发挥高性能和低功耗的优势起着至关重要的作用。针对异构多核处理系统上的应用程序动态映射和调度问题，提出一种基于机器学习、能快速准确评估程序性能和程序行为阶段变化的检测技术来有效确定重映射时机从而最大化系统性能的映射和调度解决方案。该方案一方面通过合理选择处理核和程序运行时的静态和动态特征来有效感知异构处理所带来的计算能力和工作负载运行行为的差异，从而能够构建更加准确的预测模型；另一方面通过引入阶段检测来尽可能减少在线映射计算的次数，从而能够提供更加高效的调度方案。最后，在SPLASH-2数据集上验证了所提出调度方案的有效性。实验结果表明，与Linux默认的完全公平调度（CFS）方法相比，所提出的方法在系统计算性能方面提高了52%，在CPU资源利用率上提高了9.4%。这表明所提方法在系统计算性能和CPU资源利用率方面具备优良的性能，可以有效提升异构多核系统的应用动态映射和调度效果。     

磷化氢、二氧化碳混合熏蒸对腐食酪螨卵毒杀作用的研究

本文研究了不同浓度ＰＨ＿３、ＣＯ＿２混合熏蒸在２７±１℃、ＲＨ７５±５％条件下对腐食酪螨卵的毒杀作用。结果表明：ＣＯ＿２能缓慢增加ＰＨ＿３对腐食酪螨卵的毒力，但当ＣＯ＿２浓度小于等于８％时增效作用不明显；当ＣＯ＿２浓度大于等于１６％时，随ＣＯ＿２浓度的增加，增效系数逐渐增力，最大达２．５７，单一用ＰＨ＿３杀卵时，卵对ＰＨ＿３表现出较大的耐药性，其ＬＤ＿（５０）为２．４４ｍｇ／１。本文还讨论了ＣＯ＿２对ＰＨ＿３增效不显著的机理。     

溴甲烷对臭氧层的耗损及未来使用问题

本文综述了溴甲烷的国内外使用历史和现状、溴甲烷在世界各地区的使用量和比例、溴甲烷对大气臭氧层的破坏及其来源、国际环境组织对其生产使用的限制，据此提出了溴甲烷扩散到大气中量的初步控制途径及其替代方法。     

Influence of initial CaCl2 concentration on the phase and morphology of CaCO3 prepared by carbonation

Calcium carbonate particles were prepared by bubbling the mixed gas CO₂/N₂ into CaCl₂ solution. The effect of initial CaCl₂ concentration on the morphology and phase of CaCO₃ was discussed with the help of XRD and SEM measurements. The samples prepared at low CaCl₂ concentration composed mainly of spherical vaterite. With the increase of CaCl₂ concentration, more and more rhombic particles were formed and mixed with spherical particles. When the initial CaCl₂ concentration increased to 0.3 mol/L, only rhombic calcite was formed in the final product. The change of CaCO₃ morphology with the increase of CaCl₂ concentration was attributed to the excess of Ca²⁺, which speeded the transformation of vaterite to calcite, thus more rhombic calcite was formed at higher CaCl₂ concentration.     

The kinetics of extracellular potassium changes during hypoxia and anoxia in the cat cerebral cortex

Extracellular potassium activity, [K+]0, was continuously measured using potassium specific microelectrodes in the cerebral cortex of cats before and after hypoxic or anoxic insults. Two patterns of [K+]0 increase were seen. A slow, linear rise occurred during hypoxia and hypothermia and was correlated with changes in mean blood pressure (B/P). A fast, complex, exponential rise resembling spreading depression occurred during anoxia and was unassociated with B/P changes. The fall of [K+]0 after reversal of the insult was described by a single exponential function with rate constants from 0.009 to 0.0194 sec-1. It is suggested that the linear rise is primarily a result of sodium pump inhibition and that the exponential rise is due to a superimposed sudden increase in cell membrane permeability perhaps secondary to transmitter release. The kinetics of the fall of [K+[0 is consistent with the normalization of the sodium and potassium gradients across the cell membranes secondary to Na+-K+ATPase activity.