Comparison of arylalkylamine N-acetyltransferase and melatonin receptor type 1B immunoreactivity between young adult and aged canine spinal cord

Melatonin affects diverse physiological functions through its receptor and plays an important role in the central nervous system. In the present study, we compared immunoreactivity patterns of arylalkylamine N-acetyltransferase (AANAT), an enzyme essential for melatonin synthesis, and melatonin receptor type 1B (MT2) in the spinal cord of young adult (2~3 years) and aged (10~12 years) beagle dogs using immunohistochemistry and Western blotting. AANAT-specific immunoreactivity was observed in the nuclei of spinal neurons, and was significantly increased in aged dog spinal neurons compared to young adult spinal neurons. MT2-specific immunoreactivity was found in the cytoplasm of spinal neurons, and was predominantly increased in the margin of the neuron cytoplasm in aged spinal cord compared to that in the young adult dogs. These increased levels of AANAT and MT2 immunoreactivity in aged spinal cord might be a feature of normal aging and associated with a feedback mechanism that compensates for decreased production of melatonin during aging.     

绿肥对于麦田硝酸氮含量之影响

华北土壤普遍缺乏氮肥及有机质。豆科绿肥为补充土壤氮素及有机质方法之一。但华北旱田鲜有实行绿肥者。同时中央农业实验所在陕西关中区举行之绿肥肥料试验及绿肥示范,其结果并未充分表现绿肥之效能,有时绿肥完全无效,有时绿肥尚能增加作物之产量,但其增加之产量远逊于南方绿肥之效果。华北绿肥效果不大之原因何在,颇值研究。中央农业实验所北平农事试验场于民国卅五年至卅六年间曾举行小麦绿肥试验,于卅元年夏播种绿豆,八月下旬压青,十月初播种小麦。于绿肥压青前后及小麦生长期间,定期测定土壤水分及硝酸氮含量,比较夏闲区与绿肥压青区之硝酸氮含量,研究绿肥压青对于硝酸氮含量之影响。兹将所得结果略述于后。     

Cu2O掺杂技术研究进展

氧化亚铜(Cu2O)作为理想的低成本太阳电池材料,因其表面阻抗过大导致在实际应用中转换效率偏低.如何提高Cu2O电导性已经成为Cu2O光伏应用领域研究的关键.掺杂技术作为一种控制半导体导电类型和电阻率常见的做法,被越来越多的应用于Cu2O光伏材料制备的研究.文章综述了近年来Cu2O掺杂技术的研究进展,为高效率Cu2O基太阳电池的研究提供了参考.     

宁夏回族自治区平罗县主要农作物碳足迹研究

农田碳足迹可以全面地反映农作物生产过程中各种因素引起的碳排放效应,是指导农业生产节能减排的重要指标。为探明农作物生产的碳足迹,基于宁夏回族自治区平罗县农田生产的实地调查数据,利用碳足迹的基本理论和方法,测算了该县农作物碳足迹。结果表明,水稻、玉米和小麦的碳足迹分别为1 487.56±164.59,913.03±142.99和809.75±144.99kg Ce/(hm2.a);碳成本分别为0.17±0.05,0.08±0.02g和0.12±0.03kg Ce/kg;化肥的施用量是影响碳足迹的主要因素,而水稻生产过程中灌溉水及育秧过程也是其碳足迹较高的主要原因。为了提高农田固碳减排增汇效益,应压缩水稻种植面积,扩大玉米和小麦种植,同时,建立节肥低碳高效的种植模式是实现平罗县农田节能减排的有效途径。     

北京市怀柔区设施种植业废弃物处理现状及发展

针对北京市怀柔区设施种植业废弃物处理的现状,分析废弃物处理过程中存在的问题,并提出相应的解决措施。     

Can sieving size affect the determination of soil available micronutrients?

<正>Dear Editor,Globally, approximately two billion people suffer from micronutrient deficiencies(Tulchinsky, 2010; Myers et al.,2014).Soil micronutrient availability is of great importance for the evaluation of soil fertility and the determination of appropriate measures for improving crop quality and human health.The diethylenetriamine-penta-acetic(DTPA)     

夏玉米田作物蒸腾与棵间土壤蒸发模拟计算方法研究

本文依据能量平衡原理和质量守恒定律，提出了作物蒸腾与棵间土壤蒸发的估算模式，并对参数的估算做了详细的分析和讨论。最后利用试验区实测资料，通过田间水热耦合运移的数值模拟，对夏玉米田作物蒸腾棵间土壤蒸发模型及其模拟计算方法进行了验证，结果表明，本文提出的模型和模拟计算方法是有效而实用的。     

A molecular marker linked to the Prv1 gene that confers resistance to Papaya ringspot virus-type W in melon

Papaya ringspot virus‐type W (PRSV‐W) is the most prevalent and important viral pathogen of cucurbits in Brazil. It can be effectively controlled by the incorporation of genetic resistance into susceptible melon cultivars. The present study identified amplified fragment length polymorphic (AFLP) markers linked to the PRSV‐W resistance Prv¹ allele. The susceptible yellow‐fleshed melon‐breeding line AF426^prv1 and its nearly isogenic‐resistant line AF426^Prv1, which carries the Prv¹ allele resident in the Indian cantaloupe U.S. Plant Introduction (PI) 180280, were screened for AFLP marker polymorphisms. Of 30 251 AFLP loci, only three were polymorphic between the nearly isogenic lines. Segregation analyses for these three polymorphic markers and the Prv¹ allele using a BC₁ population of 197 plants indicated close linkage (0.5% recombination frequency) between marker EK190 (HindIII‐CGA and MseI‐GTG; 190 bp) and Prv¹. Thus, EK190 might be a useful marker in breeding programmes aiming to develop melon cultivars resistant to PRSV‐W. The other two markers are closely linked to each other, but distantly linked to Prv¹.