养之于斯——滇金丝猴的食物

在白马雪山,滇金丝猴栖息在3500米—4200米的冷杉林中,以长在冷杉树上的树挂地衣——松萝,当地人称“树胡子”为主要食物,这在非人灵长类中是非常罕见的。     

蒽酮分光光度法测定海藻多糖总糖含量

本文报道了在室温下用蒽酮分光光度法测定海藻多糖总糖的含量,本法总糖测定的回收率９７．５％－１０３％,标准偏差０．３。本法设备简便,迅速、准确。     

杨梅根结线虫病及其病原鉴定

本文报道对杨梅根结线虫病的研究及病原鉴定结果。该病症状为:病树根部形成大小不一的根结,内有乳白色囊状雌虫及棕色卵囊;后期根结腐烂,病树叶片黄化脱落,梢枯乃至死亡。病原鉴定确认,引起该病的根结线虫有3个种:爪哇根结线虫(Meloidogyne javanica)、南方根结线虫(M.incognita)和北方根结线虫(M. hapla)。爪哇根结线虫为优势种。     

猪血浆制备研究—正交设计法

按照多因素多水平的正交实验结果,制备猪血浆的最佳条件是猪血与8％柠檬酸三钠溶液体积比19:1,离心时间10分钟,转速1200转/分。用此条件制备的猪血浆与羊血浆进行对比试验,证明猪血浆可以用于肝素钠抗凝血效价测定。     

Effects of zinc, copper, and selenium on placental cadmium transport

The objective of the present study was to evaluate the potential effects of zinc, copper, and selenium on placental cadmium transport. From November 2002 through January 2003, a total of 47 healthy pregnant women from Da-Ye City, Hubei Province in Central China participated in the study. Their age, parity, gestational age, pregnancy history, and lifestyle data were obtained by questionnaire interview. The placental, whole-blood, and cord blood levels of cadmium were determined by inductively coupled plasma mass spectrometer (ICP-MS), whole-blood zinc was measured by flame atomic absorption spectrometry (F-AAS), whole-blood copper by ICP-MS, and selenium was by atomic fluorescence spectrophotometry (AFS). The cord blood cadmium concentration (0.020-1.48 microg/L) was significantly lower than in maternal blood (0.80-25.20 microg/L, p<0.01). The placental cadmium concentration was from 0.082 to 3.97 microg/g dry weight. Multiple linear regression analysis indicated that lower levels of maternal blood copper were significantly associated with higher cadmium concentrations in cord blood. Placental cadmium in women with lower levels of maternal blood zinc was significantly higher than in those with normal zinc levels. The placental cadmium level in women with lower whole-blood selenium was significantly lower than in subjects with normal selenium levels. It was concluded that the essential elements copper, selenium, and zinc might significantly affect placental cadmium transport.     

采后菠萝黑心病诱导因素的研究

本文叙述了外源赤霉素ＧＡ３、低温条件对采后菠萝果实黑心病发展的影响．说明外源赤霉素ＧＡ３和低温条件都是诱导菠萝黑心病的重要因子。菠萝黑心病是一种生理失调症。实验中,未发现化学杀菌剂对此种病症显现出防治效果,而采后贮前４０℃高温处理２４小时．则可以减少和延迟此病的发生,因此．后者是一种可以应用于商品菠萝果实黑心病防治的好方法。     

Co–Ni‐Based Nanotubes/Nanosheets as Efficient Water Splitting Electrocatalysts

One promising approach to hydrogen energy utilization from full water splitting relies on the successful development of earth‐abundant, efficient, and stable electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Here, homologous Co–Ni‐based nanotube/nanosheet structures with tunable Co/Ni ratios, including hydroxides and nitrides, are grown on conductive substrates by a cation‐exchanging method to grow hydroxides, followed by anion exchanging to obtain corresponding nitrides. These hydroxide OER catalysts and nitride HER catalysts exhibit low overpotentials, small Tafel slopes, and high current densities, which are attributed to their large electrochemically reactive surface, 1D morphologies for charge conduction, and octahedral coordination states of metal ions for efficient catalytic activities. The homologous Co–Ni‐based nanotube hydroxides and nitrides suggest promising electrocatalysts for full water splitting with high efficiency, good stability, convenient fabrication, and low cost.