2021年1月国际市场主要畜产品与饲料价格分析

1月国际饲料除高粱和苜蓿粉价格下降,其他饲料价格均持续上涨;畜产品市场价格除育肥牛、牛肉、羊羔肉和猪肉外,其他畜产品价格持续上涨。一、国际饲料除高粱和苜蓿粉价格下降,其他饲料价格均持续上涨1月份高粱和苜蓿粉的平均价格分别为239.97和304.96 USD·t^?1,均环比下降0.01%。     

外源植物磺肽素α(PSKα)延缓冷藏期间草莓果实的衰老并减轻腐烂

据Scientia Horticulturae的一篇研究报道(https://doi.org/10.1016/j.scienta.2021.109906),来自伊朗伊玛目霍梅尼国际大学园艺科学系的研究人员研究了添加150 nM外源植物磺肽素α(PSKα)对冷藏期间(4℃条件下贮藏18天)草莓果实的衰老和腐烂的影响。结果表明,150 nM PSKα处理的草莓果实在4℃下贮藏6天的过程中,较低的腺苷三磷酸酶1(APY1)基因表达导致细胞外较高的三磷酸腺苷(ATP)积累,这可能是一个信号分子,可促进NADPH氧化酶活性,触发信号物质H2O2积累,导致在4℃下贮藏18天期间更高的SUMO E3连接酶(SIZ1)基因表达水平。     

高度健康猪只需要抗生素吗?

正养猪中我们应该使用多少抗生素?这是许多国家都面临的问题。在加拿大大草原养猪中心开展的一项试验表明,在高度健康状况下养猪,在断奶后添加饲用抗生素对仔猪毫无益处,且与断奶日粮无关。断奶是仔猪生命中面临应激最为严重的一段时期。在此期间,仔猪会面临3大主要应激:营养、环境和社会。总的来看,这些应激可     

Prognostic factors in cats with chronic kidney disease

BACKGROUND: Chronic kidney disease (CKD) is a common cause of morbidity and mortality in cats. HYPOTHESIS: Some baseline variables are associated with shorter survival times in cats with CKD. ANIMALS: Client-owned cats. METHODS: Cats with CKD with initial plasma creatinine concentration > or =2.0 mg/dL and urine specific gravity (USG) < or = 1.025 were recruited into a prospective clinical trial that compared benazepril with a placebo. We describe baseline variables in 190 cats and their influence on renal survival time in the placebo group (95 cats), which was followed for up to 1,097 days. Renal survival time was defined as the time from initiation of therapy to the need for parenteral fluid therapy, euthanasia, or death related to renal failure. RESULTS: Of the 95 cats treated with a placebo, 58 were censored and 37 reached the renal survival end point (died, n = 0; euthanized, n = 17; parenteral fluids, n = 12; parenteral fluids followed by euthanasia, n = 8). Increased plasma creatinine concentration, increased urine protein-to-creatinine ratio (UPC), and increased blood leukocyte count were significantly (P < .01) associated with a shorter renal survival time and were independent risk factors. Increased concentrations of plasma phosphate or urea, and lower blood hemoglobin concentration or hematocrit were significantly (P < .01) associated with a shorter renal survival time and were dependent risk factors, because they also were significantly (P < .01) correlated with plasma creatinine concentration at baseline. CLINICAL IMPORTANCE: Several variables were significantly associated with a shorter renal survival time in cats with CKD.     

籼稻品种Kasalath BAC克隆的终端序列分析和染色体制图

为了调查水稻种（Oryza sativa）内的表型多样性和进化关系，我们对衍生于籼稻品种Kasalath的BAC（细菌性人工染色体）克隆进行了大范围的终端排序和染色体in silico制图（根据序列同源性进行制图）。从47194个BAC克隆中总共获得了78427个高质量的BAC-终端序列（BES）；这些终端序列表现出总共具有37．8Mb基因组序列的482bp的平均阅读长度。排除含有重复序列的这些BES并使用粳稻品种日本晴的高质量基因组序列作为参照标准后，把这些具有成对BES的12170个克隆绘制到了12条染色体上。这些克隆由4．50个重叠群组成，     

为分析异源多倍体“固定杂种优势”建立的甘蓝型油菜人工合成系

异源多倍体广泛地分布在植物王国中，它们的成功生长可以用不同基因组上的部分同源基因的正向互作来解释，这与杂合二倍体基因型中引起杂种优势的一个基因的不同等位基因间的正向互作相似。异源多倍体纯合基因型中也会发生这种互作，因此被称为“固定杂种优势”。据我们所知，目前尚无实验数据来支持这种假说。     

Compensation of Dead Time Effects Based on the New Switching Strategy

The dead-time inserted into the switching signals of inverters case the dead-time effect of output voltage distortion. The influence of dead-time on output voltage in inverters is analyzed in detail, Then, a new switching strategy, which can provide excellent inverter output voltage distortion correction, is proposed. At last, the experiment results of inverter are presented to demonstrate the practicability and validity of the control strategy.     

葡萄酒酿造工艺与橡木桶

橡木桶的起源于17世纪～18世纪.当时,法国人生产的葡萄酒都是通过航运的方法出口到其他国家,但由于战争原因,贸易被迫中断,葡萄酒因变质而损失惨重.……     

杜邦的复合杀菌剂stinger已进入阿根廷市场

<正>本季杜邦已将它的复合杀菌剂stinger(Picoxystrobin+Cyproconazole)引入阿根廷市场。起初此产品是作为预混     

两个玉米群体对镰刀菌穗腐病抗性和伏马镰孢菌素污染抗性的相关性和遗传力

串珠镰刀菌和F.proliferatum是引起玉米穗腐和伏马镰孢菌素污染的主要病原菌，伏马镰孢菌素是影响动物和人体健康的真菌毒素。本研究的目的是评价两个玉米群体的伏马镰孢菌素含量、穗腐、开花时间的遗传力以及它们之间的基因型相关和表型相关。