保鲜膜材质与厚度差异对鲜切甜瓜贮藏保鲜的影响

贮藏鲜切甜瓜时,需要用保鲜膜对其进行包装,以保持其新鲜度。本文选用不同的保鲜膜用以鲜切甜瓜贮藏保鲜,以分析材质及厚度差异是否会影响甜瓜口感及新鲜度。由研究结果可知,选用双层保鲜膜,能够使果实保存较长时间,确保其具备较好的外观品质。而采用双层可降解保鲜膜,能够减少维生素C流失,保持POD和SOD活性。因而,鲜切甜瓜贮藏保鲜时,双层可降解保鲜膜为最佳选择。     

LY12硬铝合金表面离子注入层的性能及结构分析

用能量75keV、剂量1.0×10~(17)～7.0×10~(17)ions/cm~2的氮离子注入LYl2硬铝合金,研究了注入剂量对材料表面硬度行为的影响,实验发现存在一个剂量阈值D_(1b)=5.0×10~(17)N~+/cm~2,以该剂量的N~+注入可使LYl2硬铝合金的表面硬度得到最大程度的提高.用X-ray衍射仪探测到注入层出现AlN第二相,同时用TRIM算法计算了注入后的氮高子浓度分布和辐射损伤分布.实验和计算结果表明,弥散强化和缺陷强化是N~+注入LYl2硬铝合金的主要强化机制.     

西藏野生蜂蜜品质分析

蜂蜜作为一种天然的营养食品和药用原辅料,具有广泛的营养作用和重要的生理调节功能。对蜂蜜的质量研究,可以用蜂蜜的含糖量、5-羟甲基糠醛(HMF)含量及α-淀粉酶活性来评价。本试验研究通过对西藏林芝、山南、昌都三地区的野生蜂蜜中含糖量(还原糖含量)、5-羟甲基糠醛(HMF)含量及α-淀粉酶活性(淀粉酶值)进行分析测定,从而对其品质进行分析评价。     

无臭大蒜系列产品加工技术

1　无臭蒜素保健饮料的加工技术原料质量要求 :选择成熟、干燥、无虫蛀、无霉烂、不发热、无变质的大蒜。煮熟的蛋黄　　↓　　　　　工艺流程 :鲜蒜→切蒂、分瓣、剥内衣→破碎→焙干→磨粉→浸泡→除臭 (6个月 )→分离→保健饮料。　　　　　　↑↑　　　　蜂蜜┘└粉碎←芝麻　　操作方法 :①鲜蒜验收。按原料质量标准收购的原料必须堆放在通风、干燥的地方 ,防止日晒雨淋 ,否则会发热、霉烂变质。②选检。去蒂、剥内衣。堆放的原料仍需进一步检出不合质量标准的大蒜 ,然后分瓣、切蒂、去内衣。③洗涤。将去蒂剥内衣后的蒜料倒入大缸或水…     

果葡糖浆对黄桃罐头品质影响分析

为了探讨和比较果葡糖浆应用于黄桃罐头的可行性,通过对不同种类糖水的应用比较,研究不同糖水对成品品质的影响和市场接受度调查。结果表明:果葡糖浆应用于黄桃罐头的加工,在贮藏3个月,6个月和12个月后,成品的品质(组织形态,色泽等)与蔗糖比较没有显著差异(P0.05),且在风味指标上有显著差异并优于蔗糖。消费者的可接受度与蔗糖糖水罐头没有显著差异(P0.05)。结论:果葡糖浆完全能够代替蔗糖应用于黄桃罐头的加工。     

认识冷冻食品

平常我们总会抱怨从超市买来的饺子吃起来不新鲜,其实你并不知道冷冻食品是通过急速低温(-18℃以下)加工出来的速冻食品,食物组织中的水分、汁液不会流失,在低温下,微生物基本上也不会繁殖,食品的安全性有了保证,但口感、风味方面的变化却难以避免.     

树莓中超氧化物歧化酶(SOD)提取及不同条件下酶活力探究

由冷冻树莓制得粗酶液,测树莓中超氧化物歧化酶(SOD)的活力48.78U/g,其含量228.544μg/g鲜重。通过分别以新鲜的树莓、解冻1h树莓和加入浓度为10-6mol/L的抗坏血酸浸泡1min的树莓果实来探究酶活力。结果表明:相对条件下,冷冻树莓有最大的超氧化物歧化酶(SOD)活力。     

黑龙江流域冰封及航道维护特点

黑龙江水系中的各江河都是冰冻河流,整个流域的不同河流和河段的封冻和解冻、流冰明显存在着不同。黑龙江流域河流的季节性封冻,形成了航道维护的周期性和不连续性。     

ZL201时效处理工艺DSC法研究

以ZL201为研究对象,优化其时效处理工艺。运用示差扫描量热仪(DSC)对经过固溶处理后的铝合金在5℃/min的加热速度下进行热分析,得到DSC曲线峰值温度为240℃。综合考虑影响强化相析出的各种因素,新时效工艺采用加热速度为5℃/min的连续加热方式将固溶处理后的试样分别加热到230℃、235℃、240℃、245℃、250℃后炉冷,然后测定其硬度及应力腐蚀性能,并与传统时效工艺下的性能相比较。研究结果表明:新的时效工艺在235℃时,出现硬度峰值,同时应力腐蚀性能符合要求,证明ZL201连续加热的时效工艺是可行的。     

内镜下甲状腺切除19例分析

[目的] 探讨内镜下甲状腺切除的可行性及技术特点。[方法] 回顾性总结19例内镜下甲状腺切除的方法与经验，并对其优缺点进行探讨。[结果] 腺叶全切12例，腺叶大部切除4例。肿块剜除3例，手术全部成功，平均手术时间：乳晕入路194min(140～320min)，胸骨上入路106min(80～150min)。与传统甲状腺手术相比，内镜下甲状腺切除美容效果显著，术后恢复较快。[结论] 内镜下甲状腺切除安全、可行，目前主要适用于甲状腺良性疾病。     

Immunomodulation of ovalbumin-specific IgG and other classes of antibody response by honey in mice

It was reported earlier that intraperitoneal administration of honey had immunosuppressive activity on elicitation of allergen-specific murine antibody response as evaluated by passive cutaneous anaphylaxis and double immunodiffusion methods. In this study, the immunomudulatory effect of honey is evaluated by enzyme linked immunosorbent assay (ELISA) using ovalbumin as model allergen. It was found that ovalbumin (OVA)-specific IgG antibody responses elicited with various doses of OVA were significantly suppressed by rock bee honey (p<0.01). Honey was also found to have inhibited the production of OVA-specific IgM, IgA, IgG₁, and IgG_2b whereas that of IgG_2a and IgG₃ were not affected. Furthermore, honey also suppressed the OVA-specific total IgG antibody response in various inbred mice with different genetic background. In addition, the suppressive activity of honey was examined in different groups of mice by injecting honey at different time intervals, before and after immunization with OVA. The anti-OVA IgG antibody response was suppressed significantly when honey was injected 12 hours prior/latter to OVA injection. These results confirm the suppressive activity of honey on antibody response and suggest possible clinical application.     

利用恢复系数,能量吸收百分率预测桃子硬度

建立了桃子冲击力学特性参数（恢复系数、能量吸收率）与其硬度的数学模型，从而为快速非破坏预测桃子成熟度（硬度）和实现机械自动化分级提供必要的科学依据。     

微波和脉冲磁场复合作用下鲜切哈密瓜杀菌实验研究

本文进行了微波和脉冲磁场复合作用下鲜切哈密瓜的杀菌实验研究,考察了微波预处理,磁场强度,脉冲次数及初始茵落总数对杀菌效果的影响。研究结果表明：微波和脉冲磁场的复合处理可以有效杀死鲜切哈密瓜中的细菌,茵落总数的最大杀菌率可以达到99．9％;12s的微波预处理可以起到物料升温与一定的杀菌作用,为脉冲磁场下鲜切哈密瓜的杀菌创造了有利条件;当磁场强度为0．6T时,随着脉冲作用次数的增加,菌落总数先下降,后有所增加,其转折点为20;当脉冲数为10时,随着磁场强度的增加,茵落总数总体上呈下降的趋势;初始菌落总数的增加有利于微波杀菌效果的提高,但对脉冲磁场的杀菌效果影响较小。     

乙腈和甲醇选择性合成丙烯腈的Ag/MgO催化剂

分别采用浸渍法和沉淀法制备了不同Ag含量(1％～8％)的Ag／MgO系列催化剂，考察了催化剂的活性组份含量及制备方法、反应温度等因素对乙腈和甲醇选择性合成丙烯腈的影响，并对催化剂进行了XRD和CO2-TPD表征．结果表明，通过浸渍法加入的Ag对MgO催化剂的催化性能有一定提高，而沉淀法制备的Ag／MgO催化剂基本上没有活性．对浸渍法制备的Ag(5％)／MgO催化剂，催化剂活性随温度的升高而明显增强．     

三元能量对桃树的作用

运用三元能量作用于桃树，结果表明：萌芽速度，含苞质量，新梢茎粗变化，百叶宽，长、重量量、果品质量、白花坐果率，抗病虫害，产量等项目指标，均有效地提高和改善，证明：可将三元能量运用于桃树以提高产量和质量。     

SBA-15负载磷钨杂多酸催化合成柠檬酸三乙酯

采用浸渍法制备了SBA-15负载磷钨杂多酸酸催化剂,并应用于柠檬酸和乙醇的酯化反应,考察了影响反应的因素。结果表明,SBA-15负载磷钨杂多酸酸催化剂具有很好的催化效果,回流反应3h,催化剂用量为原料质量的1.0%,酸醇摩尔比为1:4时,柠檬酸三乙酯收率为90%以上。     

蜂蜜沙棘果酒稳定性研究

本文以鄂尔多斯高原优质野生沙棘为主要原料,以天然的纯蜂蜜为辅助原料,发酵得到的蜂蜜沙棘酒进行稳定性研究。结果表明沙棘酒对蛋白不稳定,添加150mg/L皂土处理可使酒体蛋白稳定;但酒对铁、铜、氧化均较稳定。     

Efficacy of topical honey therapy against silver sulphadiazine treatment in burns: A biochemical study

Thermal injury is associated with biochemical changes. The present study was undertaken to investigate relation of oxidative free radical generation and related biochemical parameters in burn trauma. The specific aim was to compare the levels of serum lipid peroxide, Ceruloplasmin and Uric Acid in burn patients during treatment with Silver Sulfadiazine Cream and honey therapy. It is a single blind prospective controlled study involving comparison of biochemical changes after treatment with silver sulfadiazine and honey treatment in burn injury. In burn trauma, there is excessive activity of free radicals at the site of injury. This is reflected in elevated blood levels of Lipid peroxide, Ceruloplasmin & Uric Acid. Honey therapy was was shown to decline the levels of serum Lipid peroxide, while there was mild increments in serum Ceruloplasmin levels whereas there was no significant effect on serum Uric Acid levels as compared to silver sulfadiazine treatment. Honey therapy seems to accelerate the process of healing. It has positive effect in reducing oxidative stressful state in burn trauma than the silver sulfadiazine treatment that results in rapid wound healing.     

Evaluation of sample hemolysis in blood collected by S-Monovette? using vacuum or aspiration mode

Background:

In vitro hemolysis can be induced by several biological and technical sources, and may be worsened by forced aspiration of blood in vacuum tubes. This study was aimed to compare the probability of hemolysis by drawing blood with a commercial evacuated blood collection tube, and S-Monovette used either in the “vacuum” or “aspiration” mode.

Materials and methods:

The study population consisted in 20 healthy volunteers. A sample was drawn into 4.0 mL BD Vacutainer serum tube from a vein of one upper arm. Two other samples were drawn with a second venipuncture from a vein of the opposite arm, into 4.0 mL S-Monovette serum tubes, by both vacuum an aspiration modes. After separation, serum potassium, lactate dehydrogenase (LD) and hemolysis index (HI) were tested on Beckman Coulter DxC.

Results:

In no case the HI exceed the limit of significant hemolysis. As compared with BD Vacutainer, no significant differences were observed for potassium and LD using S-Monovette with vacuum method. Significant increased values of both parameters were however found in serum collected into BD Vacutainer and S-Monovette by vacuum mode, compared to serum drawn by S-Monovette in aspiration mode. The mean potassium bias was 2.2% versus BD Vacutainer and 2.4% versus S-Monovette in vacuum mode, that of LD was 2.7% versus BD Vacutainer and 2.1% versus S-Monovette in vacuum mode. None of these variations exceeded the allowable total error.

Conclusions:

Although no significant macro-hemolysis was observed with any collection system, the less chance of producing micro-hemolysis by S-Monovette in aspiration mode suggest that this device may be used when a difficult venipuncture combined with the vacuum may increase the probability of spurious hemolysis.