存储期在3、6、9、12、15天的血液制备的洗涤红细胞质量分析

本研究旨在分析存储期在3、6、9、12、15天的去白悬浮红细胞制备的洗涤红细胞的质量,以评估不同存储期对洗涤红细胞质量的影响。方法 取存储期分别为3、6、9、12、15天的去白悬浮红细胞各24袋,制备成洗涤红细胞。观察并比较洗涤红细胞回收率、白细胞清除率、上清蛋白质含量、血红蛋白含量、溶血率以及原料血溶血率。结果 随着存储期的延长,洗涤红细胞回收率呈现逐渐下降的趋势,尤其在12天和15天时显著降低。各存储期的白细胞清除率均保持在较高水平,但在存储期为15天时略有下降。上清蛋白质含量与溶血率在存储期为3天和6天时较低,随着存储期的延长,蛋白质含量与溶血率逐渐增加,15天时明显升高。血红蛋白含量与原料血溶血率在各存储期内变化不大,但在存储期为15天时血红蛋白含量明显下降,原料血溶血率明显增加。结论 存储期对洗涤红细胞的质量有显著影响。随着存储期的延长,洗涤红细胞回收率和白细胞清除率有所下降,上清蛋白质含量和溶血率显著增加,血红蛋白含量略有下降。建议在临床应用中,尽量选择存储期较短的血液制备洗涤红细胞,以保证其质量和安全性。

显微相衬技术分析去白细胞悬浮红细胞上清液不同存储期内细胞碎片及微粒的图像变化

目的探索库存去白细胞悬浮红细胞,随着保存时间的延长,红细胞破损或溶血而产生的细胞碎片及微粒变化,为输血安全提供启示性实验基础。方法取不同保存天数(3、7、14、21d)的库存去白细胞悬浮红细胞进行上清液制备,通过显微静态图像分析技术对上清液中的微粒进行观察和形态分析。结果保存3d和7d的样品上清液中可见少量微粒,微粒大小和细胞相仿;从14d开始微粒的数量显著增加,微粒粒径更小,到21d微粒铺满了整个视场,呈现碎片化。结论保存期超过14d的库存去白细胞悬浮红细胞,其上清液的细胞碎片及微粒显著增多,较保存期不到14d的细胞均有显著的差异。这些外源细胞碎片或微粒可能会成为抗原并引起机体的免疫反应,导致输血不良反应发生,建议临床上给患者输注保存期在14d以内的去白细胞悬浮红细胞。

食品存储期智能管理设备软硬件设计

本文研发了一种食品存储器智能管理设备,系统使用STC89C52单片机为主控芯片,采用DS1302芯片更新当前的日期和时间数据。通过条码扫描器、按键、LCD12864液晶和RS232串口通信实现了万年历、条码扫描、条码匹配和判断、保质期设定、保质期快过期预提醒、保质期过期提醒和食品信息删除功能。

存储期变温状态对小麦安全水分及微生物活动的影响

农业是我国的支柱产业,粮食直接关系到人们的正常生活,而小麦是我国主要的粮食农作物之一,其仓储安全直接影响着我国的粮食安全。本文主要围绕着存储期变温状态对小麦安全水分及微生物活动的影响展开研究,从3个方面进行了详细分析,以期提高我国小麦的产量。

抗菌整理对甘蔗纤维存储期的影响

保存条件或存储期会影响甘蔗纤维的物理性能,因此尝试通过抗菌整理改善其性能。从不同品种的甘蔗作物COC671、COM265、CO86032中提取甘蔗纤维作为研究对象。为了研究抗菌整理对甘蔗纤维存储期的影响,对原始样品的抗张强力、伸长(在最大载荷下)、应力松弛、扭转刚度和抗挠刚度等物理性能进行了测试。将纤维样品分成两组进行对比测试,其中一组进行抗菌整理,另一组不作整理,放置4个月后再次测试两组纤维的性能,并进行比较,同时与原始样品的性能进行对比。

酒糟存储安全期预测

酒糟自燃火灾时有发生，酒糟的消防安全存储问题值得关注。采用分段试验、分类合并的方法获得酒糟温度一时闯变化规律。测试了4个温度段，用最小二乘法分别拟合出低温区和高温区两类线性方程，进而得出了酒糟自燃临界温度为80～83℃，酒糟消防安全存储期为97d，酒糟自燃期为118d，为酒糟消防安全存储与管理提供科学依据。

不同存储期山茱萸中马钱苷的含量测定研究

中药山茱萸为山茱萸科植物山茱萸（Cornus officinalis Sieb.et.Zucc.）的干燥成熟果肉,具有补益肝肾,收涩固脱的作用,用于眩晕耳鸣,腰膝酸痛,阳痿遗精,遗尿尿频,崩漏带下,大汗虚脱,内热消渴[1]。山茱萸中主要成分有有机酸及其酯类、五环三萜及其酯类、环烯醚萜苷类、鞣质类、多糖、维生素、氨基酸和矿物质等。

不同存储条件对芝麻调和油品质的影响

本文对比了抗氧化剂TBHQ、充氮罐装、PET、PE、玻璃瓶包装对芝麻调和油储存稳定性的影响,跟进了产品货架期18个月中过氧化值、酸价的变化。结果表明,过氧化值是芝麻调和油的敏感指标,在存储条件下,充氮罐装产品过氧化值稳定;不同包装物对比表明,白色PET瓶最差,玻璃瓶最佳。

航空密封腻子的再生

航空密封腻子储存一年后．已经变硬并且不能使用。试验发现：对其加入0．2份的TMTD并进行澳炼，腻子变得柔软并符合技术要求条件。除此之外，塑炼后的减于储存期仍为一年。

茶叶领域微型计算机的应用研究

就计算机而言,分门别类,多种多样。本文所讲的微型计算机也可简称为"微型机"或"微机",因计算机拥有人类大脑的某部分功能,也可通俗地称之为"微电脑"。微型电脑是一种体积较小的计算机,且仍由大规模的集成化电路构成,同时基于微型处理器配置内存储元件、输入输出I/O端口和相关辅助电路等。微型计算机很大一部分设备集中组合于主机机箱内,另外的外设设备也与机箱临近并连接。本文则通过分析茶叶领域微型计算机应用的发展历程和以实例剖析茶叶领域微型计算机的应用方法及发展趋势。

Travel time and alternative configurations analysis for automated storage/retrieval systems based on geometrical method

In order to evaluate the efficiency of the automated storage/retrieval system(AS/RS)accurately,and compare different layouts of the AS/RS using mean travel time,under randomized storage conditions,an exact,geometry-based analytical model is presented.The model can be used to compute the expected single-command and dual-command travel time for a storage/retrieval(S/R)machine which can travel simultaneously horizontally and vertically as it moves along a storage aisle.The rack may be either square in time or non square in time.Additionally,the alternative layouts of the AS/RS and travel-time models are examined.Comparing with setting the I/O point at the left-lower corner of the rack,setting the I/O point at any point at the vertical edge can help enhance the efficiency of the AS/RS.

Investigation into the Total Phenols and Antioxidant Activity during Storage of Fruit Smoothies

In this study, the total phenols （TP） and antioxidant activity of three different fruit smoothies （Blackberries, Raspberry and Boysenberry （BRAB）, Mango and Passion fruits （MAP） and Blackcurrant, Acerola cherries and Rosehips （BACAR）） were determined during storage by Folin-Ciocalteu and ferric reducing antioxidant power （FRAP） assays respectively. TP ranged from 1,943 to 2,692 mg L-1 gallic acid equivalent whereas FRAP from 43,217 to 126,125 μmol L-1 Trolox equivalent for the three smoothies on opening. BACAR had the highest TP and antioxidant activity. The smoothies showed significant decrease （P 〈 0.05） in TP during storage. The decrease in antioxidant activity was significant （P 〈 0.05） for BRAB and MAP only. However, the study revealed that the smoothies had high antioxidant activity even during shelf-life at 4 ℃ which implies that consumption of smoothies may give considerable antioxidant benefits. Correlation between TP and antioxidant activity was strong and highly significant （r = 0.890, P 〈 0.0001）.

Effects of Cold Storage on Quality Traits of Sardinian Myrtle （Myrtus communis L.） Berries and Their Alcoholic Extracts

Myrtus communis L. is a spontaneous aromatic plant typical of the Mediterranean area. Myrtle berries hydrodistilled products and ethanolic extracts are mainly used as flavouring agents and food supplements. This study evaluated the effect of long-term storage on the quality-related properties of myrtle berries. Storage at 2 ~C for three months effbctively preserved myrtle berries quality, both in the chemical composition and external appearance. No symptoms of chilling injury and decay occurred during the first two months of storage, at the end of storage only the 1.3% of rotting was detected. Total anthocyanic content and anthocyanin glycosides diminished whereas the antioxidant capacity increased in all samples till the end of storage. The antioxidant properties of myrtle berries were not correlated with the anthocyanic fraction. The pH of myrtle berries decreased, while gluconic acid levels increased. The results reported in this paper showed that the storage at 2 ~C for three months appears to be an effective way to preserve myrtle berries quality. The changes in the chemical composition of the fruits subjected to storage had revealed the importance of gluconic acid and pH for myrtle quality assessment. These two parameters can be used as quality markers since a strong relationship has been found between myrtle decay and the changes in these parameters,

Frequency Variations of Power System Due to Switching of Renewable Energy Sources

Power systems in Germany mainly containing intermittently operating renewable sources require load/frequency control which is performed up to now at the AC transmissioh and distribution levels. Frequency control can be achieved by employing short-and long-term storage plants buffering and complementing renewable energy sources. A representative grid consists of a natural-gas-fired plant serving as frequency leader, long-term storage plant, wind-power farm with associated short-term storage plantfor energy buffering, and photovoltaic farm with associated short-term storage plant interconnected by a long transmission line to two load circuits. Transient analysis is performed with Mathemafica solving the differential equation system for frequency variation. Powerflow through the AC transmission line is limited by its impedance. The long transmission line must be segmented to achieve stability and voltage control over an 800 km distance. The renewable plants must be operated together with the storage plants in order tominimize frequency variations by smoothing the power output of renewable plants, achieving step-wise control of the transmission-line power. Although to date only AC Iransmission lines in Germany exist, it is anticipated that within the next 10 years these will beaugmented by DC high-voltage lines.

Influence of Calcium Sources and Concentration on the Storage Performance of Strawberry Fruit

Chemical application after harvest is an important method to preserve strawberry fruit quality and extend shelf life. The strawberry fruits harvested at red stage were treated with three different sources of calcium, i.e., calcium nitrate, calcium gluconate and calcium chloride at calcium concentration of 0% （distilled water）, 0.5%, 1.0% and 1.5%. The strawberry fruits were dipped for 30 s. The calcium sources, calcium concentration and the interaction of calcium sources and calcium concentration significantly affected the storage performance of strawberry fruits. All the three sources and concentrations were effective in decreasing the storage associated changes, i.e., weight loss, decline in marketable fruits, loss of organoleptic quality, increase in total soluble solids （TSS）, decline in reducing sugars, total sugars, acidity and increase in sugar/acid ratio in strawberry fruit, thus extending the shelf life. Calcium gluconate at 1.5% calcium concentration was more effective. Treatment of strawberry fruit with 1.5% calcium from calcium gluconate source resulted in the highest number of marketable fruit （100%）, extended shelf life （10 d）, and total soluble solid （7.80%） with the minimum weight loss （5.45%）. Calcium dips result in higher calcium concentration in strawberry fruits, which delays ripening in fruits by maintaining the structure and function of cell walls and membranes. It can be concluded that calcium gluconate at 1.5% concentration is an effective calcium treatment to retain the quality and extend the shelf life of strawberry fruit.

心脏磁共振对心房颤动射频消融术后早期复发的预测价值

目的观察心房颤动患者射频消融术后心电图、心脏三维超声、心脏磁共振(cardiac magnetic resonance, CMR)的参数变化,探讨CMR对心房颤动患者射频消融术后早期复发的预测价值。方法接受射频消融术治疗的心房颤动患者66例,根据是否早期复发分为复发组35例和无复发组31例。比较2组心电图、心脏三维超声及CMR测量指标;多因素logistic回归分析心房颤动患者射频消融术后早期复发的影响因素;绘制ROC曲线,评估左心房容积指数及左心房存储期应变力对心房颤动患者射频消融术后早期复发的预测价值。结果复发组持续性心房颤动比率(60.00%)高于无复发组(35.48%)(P<0.05),心脏三维超声测量的左心房上下径[(5.91±0.64)cm]、左心房左右径[(4.65±0.54)cm]及CMR测量的左心房容积指数[(59.77±12.18)mL/m^(2)]均大于无复发组[(5.54±0.52)cm、(4.13±0.37)cm、(53.78±11.23)mL/m^(2)](P<0.05),CMR测量的左心房存储期应变力[(32.11±3.05)%]低于无复发组[(35.77±5.63)%](P<0.05)。左心房容积指数(OR=3.274,95%CI:2.053~4.495,P<0.001)、左心房存储期应变力(OR=3.256,95%CI:1.645~4.867,P<0.001)是心房颤动患者射频消融术后早期复发的影响因素。左心房容积指数、左心房存储期应变力的最佳截断值分别为48.5 mL/m^(2)、34.0%时,预测心房颤动患者射频消融术后早期复发的AUC分别为0.647(95%CI:0.513~0.781,P=0.040)、0.708(95%CI:0.579~0.838,P=0.004),灵敏度分别为71.4%、72.0%,特异度分别为61.3%、61.5%。结论 CMR测量的左心房容积指数及左心房存储期应变力是心房颤动患者射频消融术后早期复发的影响因素,二者对心房颤动患者射频消融术后早期复发有一定预测价值。

如何确定商业汇票的承兑日期

商业汇票是有一定承兑期限的信用凭证。如何确定商业汇票的保利、保本和保亏的承兑日期,首先要确定商品的保利、保本和保亏存储期,然后再结合商品的已存储期来推断具体的承兑日期。一、确定保利存储期保利存储期确定应考虑的因素有:毛利、固定费用、目标利润、日变动费用和税金。用公式表示为: 保利存储期=(毛利-税金-固定费用-目标利润)/日变动费用……(1)

Ecology of avian influenza viruses in migratory birds wintering within the Yangtze River wetlands

Migratory birds are considered natural reservoirs of avian influenza A viruses(AIVs).To further our viral ecology knowledge and understand the subsequent risk posed by wild birds,we conducted a 4-year surveillance study of AIVs in the bird wintering wetlands of the Yangtze River,China.We collected over8000 samples and isolated 122 AIV strains.Analyses were then carried out with 108 novel sequenced genomes and data were deposited in GISAID and other public databases.The results showed that the Yangtze River wintering wetlands functioned as a mixing ground,where various subtypes of AIVs were detected harboring a high diversity of nucleotide sequences;moreover,a portion of AIV gene segments were persistent inter-seasonally.Phylogenetic incongruence presented complex reassortment events and distinct patterns among various subtypes.In addition,we observed that viral gene segments in wintering wetlands were closely related to known North American isolates,indicating that intercontinental gene flow occurred.Notably,highly pathogenic H5 and low pathogenic H9 viruses,which usually circulate in poultry,were found to have crossed the poultry/wild bird interface,with the viruses introduced to wintering birds.Overall,this study represented the largest AIV surveillance effort of wild birds within the Yangtze River wintering wetlands.Surveillance data highlighted the important role of wintering wild birds in the ecology of AIVs and may enable future early warnings of novel AIV emergence.