葡萄贮藏过程中几个生理参数动态变化的研究

研究了葡萄在贮藏过程中的呼吸强度，过氧化物酶和过氧化氢酶活性的动态变化，结果证明：葡萄果实在贮藏期间呼吸强度和过氧化物酶的活性变化是同步的，而过氧化氢酶正好相反，据此可以认为这三者均可作为葡萄贮藏的重要生理参数。     

采后热处理对蒙自石榴贮藏品质的影响

该篇探讨了热水处理对石榴采后常温贮藏期间主要生理和品质变化的影响.石榴经过38℃、45℃、50℃,5min、10min、15min处理,结果表明,38℃,15min热水处理可有效提高好果率,降低失重率,较好的抑制石榴采后呼吸强度、质膜相对透性,降低过氧化物酶(POD)活性,提高苯丙氨酸解氨酶(PAL)活性.实验证明热处理能有效减缓石榴品质的下降,延缓石榴采后衰老速度,有利于延长贮藏期限和保持石榴原有的风味品质.     

壳聚糖涂膜对富川脐橙的保鲜机理与效果研究

研究了壳聚糖涂膜对富川脐橙的保鲜效果和保鲜机理.结果表明:3%壳聚糖浓度涂膜可明显延缓富川脐橙酸含量、总糖含量、Vc含量的降低,延长贮藏寿命.由于壳聚糖分子中基团的作用,有效抑制致病菌入侵;膜的特性及其对果实酶的诱导作用,抑制了脐橙呼吸强度,提高SOD活性,从而达到保鲜目的.     

壳聚糖涂膜对富川脐橙的保鲜机理与效果研究

研究了壳聚糖涂膜对富川脐橙的保鲜效果和保鲜机理。结果表明：3％壳聚糖浓度涂膜可明显延缓富川脐橙酸含量、总糖含量、Vc含量的降低，延长贮藏寿命。由于壳聚糖分子中基团的作用，有效抑制致病菌入侵；膜的特性及其对果实酶的诱导作用，抑制了脐橙呼吸强度，提高SOD活性，从而达到保鲜目的。     

低温对杨梅采后生理及保鲜效果的影响

研究了低温对杨梅果实采后生理和贮藏效果的影响.结果表明,与常温对照相比,低温(4℃)抑制了果实呼吸强度,减缓了果实细胞膜透性的增加,延缓杨梅果实总可溶性固形物、维生素C、有机酸等含量的下降,显著提高好果率,说明低温能抑制杨梅采后的衰老腐烂,有利于保持果实品质和延长贮藏期.     

荔枝短期储存过程中过氧化氢酶及维生素C含量变化研究

以荔枝品种乌叶和桂味为实验材料,研究荔枝在28℃、4℃、0℃、-15℃短期储藏过程中其果实中过氧化氢酶及Vc的变化规律.结果表明,低温冷藏过程中荔枝中Vc的含量均呈下降趋势,而过氧化物酶的活性则逐渐上升,温度对二者均有明显影响.     

我国番荔枝采后生理研究进展

对番荔枝果实的生物学特性、采收成熟度、采后形态变化、采后贮藏期间呼吸强度、乙烯释放量、果肉组织pH值、细胞膜透性、酶活性以及贮藏适温进行了综述，并提出今后番荔枝采后研究的方向．     

不同涂蜡处理对杨桃果实采后贮藏性能的影响

研究了相对湿度93％，5℃条件下杨桃果实经不同来源果蜡处理后采后成熟特性和肉质变化。结果表明：所选果蜡对杨桃采后贮藏品质，如果皮颜色、果实呼吸强度、果实失重率．果实可溶性固形物含量，均有不同程度的促进，其中纳米保鲜果蜡在延迟杨桃采后黄化．降低失重率等方面均优于其他果蜡。     

谈细胞内H2O2的生成及转化

高中生物学教材实验五 ,比较过氧化氢酶和Ｆｅ3+的催化性 ,是一个验证酶的催化效能高的实验 ,实验现象非常明显 ,结论可信。教师和学生大多对此实验没有什么疑问。但本实验选用的酶是肝细胞中的过氧化氢酶 ,教师和学生感到比较生疏 ,相关的一些问题值得探讨。如细胞中的Ｈ2 Ｏ2 是如何生成的 ?是否只有肝细胞内有过氧化氢酶 ?Ｈ2 Ｏ2 生成Ｏ2 是分解反应吗 ?过氧化氢酶催化这一反应具有什么生物学意义 ?本文对此作一简要介绍。1　过氧化物酶体Ｈ2 Ｏ2 的生成及转化均是在过氧化物酶体中进行的。在人和动物的某些组织中 ,如肝、胃、中性粒细…     

丁香提取液对脐橙贮藏保鲜效果研究

以丁香提取液为原料,应用于脐橙采后贮藏保鲜试验.采用0,2%,3%,4%的丁香提取液浸泡脐橙后贮藏,定期检测相关指标.结果表明2%,3%和4%质量分数的丁香提取液均能有效减少脐橙的失重率和腐烂率.常温贮藏100 d后,与对照相比,3%丁香提取液处理的果实腐烂率降低了22.79%,失重率减少了7.08%;且有效延缓果实总酸的消耗,保持较高的过氧化物酶(Peroxidase,POD)活性,减少丙二醛(Malondialdehyde,MDA)的积累,其保鲜效果最佳,说明丁香提取液可作为天然保鲜剂应用于脐橙采后贮藏保鲜.     

6—BA对沙田柚果实品质和耐藏力的影响

本试验研究 6—BA对沙田柚果实的生理效应.试验结果表明:10PPm的 6—BA具有明显的抑制褪绿转黄,延缓衰老,提高含糖量,增大固酸比,改善品质和增强耐藏力的生理效应。     

The role of family preservation therapists in facilitating use of aftercare services

OBJECTIVE: The aims were to: (1) examine the process that family preservation therapists use when developing and implementing aftercare plans, and (2) examine how family preservation therapists perceive the availability and accessibility of community services that families need after short-term family preservation services. METHOD: Focus groups were conducted with therapists (n = 26) from five agencies that provide family preservation services in a large Midwest city. One agency was the local public child welfare agency, and the other four were nonprofit agencies with state contracts to provide family preservation services. RESULTS: Therapists viewed aftercare services as important and necessary, yet perceived barriers to families' use of aftercare services. Therapists undertook a number of activities to help families access and use services, though some therapists took a less active role than others did in helping families link to services. It was perceived that more follow-up was needed to ensure service use. Participants viewed certain services as especially difficult to access or unavailable, including services for men and adolescents. CONCLUSIONS: More explicit and focused attention to facilitating service use is needed. This can be accomplished by therapists focusing on service use during assessment and treatment planning. Regular follow-ups after short-term family preservation services for the purpose of helping families to productively use services may be needed. However, systemic changes are also needed to ensure that needed services are available and accessible.     

试论金柑水果的品牌建设——以福建尤溪金柑品牌建设为例

由于水果有很强的同质性,随着消费需求的快速变化,水果市场的竞争越来越激烈,面对众多的竞争对手,作为传统水果行业,应该如何形成自己的特色,发挥品牌竞争优势,将是未来水果行业发展的关键所在。品牌作为一种竞争性资产,在竞争上的优势突出表现为经济、管理和战略三个方面,品牌已成为水果市场竞争的重要手段之一。因此,对于水果市场品牌建设显得尤为重,特别是根据水果市场的特点,通过有效措施,推进水果品牌的建设,提高水果的市场占有率,促进水果产业的持续发展。     

烟草罹赤星病后苯丙烷类代谢途径有关酶及物质的动态研究

研究测定了不同抗性的烟草品种接种赤星病菌后,苯丙氨酸解氨酶和过氧化物酶活性以及总酚和类黄酮含量的变化.结果表明,苯丙氨酸解氨酶活性峰与抗病性负相关,抗病品种的总酚和类黄酮含量高峰及过氧化物酶活性峰高于感病品种.这些峰值的大小可作为鉴定品种抗病性的生化指标.     

玉米种子成熟过程中细胞膜脂过氧化及体内抗氧化酶活性变化的研究

研究了沈试-29玉米种子在成熟过程中四种酶活性的变化及膜脂过氧化产物丙二醛（MDA）含量的变化。结果表明：超氧化物歧化酶（SOD）,过氧化物酶（POD）和过氧化氢酶（CAT）活性的变化一致即由乳熟期到蜡熟期活性下降,完熟期和枯熟期SOD、POD和CAT的活性又开始上升,而抗坏血酸氧化酶（AAO）的活性的变化则与此相反;MDA含量在蜡熟期上升,在完熟期和枯熟期下降。由此可见,种子的成熟过程中发生了氧化和过氧化作用,并存在活性氧的伤害。     

中国城市历史街区保护与更新的问题及对策

当下中国城市历史街区的保护与更新还存在诸多弊端．本文从历史街区人文氛围的危机、保护与更新的力度和保护与更新的政策三个层面进行了探讨,提出了应对之策。     

Similarity-based denoising of point-sampled surfaces

A non-local denoising （NLD） algorithm for point-sampled surfaces （PSSs） is presented based on similarities, including geometry intensity and features of sample points. By using the trilateral filtering operator, the differential signal of each sample point is determined and called ＂geometry intensity＂. Based on covariance analysis, a regular grid of geometry intensity of a sample point is constructed, and the geometry-intensity similarity of two points is measured according to their grids. Based on mean shift clustering, the PSSs are clustered in terms of the local geometry-features similarity. The smoothed geometry intensity, i.e., offset distance, of the sample point is estimated according to the two similarities. Using the resulting intensity, the noise component from PSSs is finally removed by adjusting the position of each sample point along its own normal direction. Experimental results demonstrate that the algorithm is robust and can produce a more accurate denoising result while having better feature preservation.     

Similarity-based denoising of point-sampled surface

A non-local denoising (NLD) algorithm for point-sampled surfaces (PSSs) is presented based on similarities, including geometry intensity and features of sample points. By using the trilateral filtering operator, the differential signal of each sample point is determined and called "geometry intensity". Based on covariance analysis, a regular grid of geometry intensity of a sample point is constructed, and the geometry-intensity similarity of two points is measured according to their grids. Based on mean shift clustering, the PSSs are clustered in terms of the local geometry-features similarity. The smoothed geometry intensity, i.e., offset distance, of the sample point is estimated according to the two similarities. Using the resulting intensity, the noise component from PSSs is finally removed by adjusting the position of each sample point along its own normal direction. Experimental results demonstrate that the algorithm is robust and can produce a more accurate denoising result while having better feature preservation.     

Structural decomposition analysis on energy intensity changes at regional level

As China’s energy intensity fluctuated in recent years, it is necessary to examine whether this fluctuation happened at a regional level. This paper establishes a decomposition model by using the structural decomposition analysis (SDA) method at a regional level. Then this model is employed to empirically analyze the changes of Beijing’s energy intensity. The conclusions are as follows: during 2002-2010, except petroleum, the energy intensity decreased and the changes were mostly attributed to the technology changes, while the final use variation actually increased the energy intensity; comparing different periods of 2002-2010, the decline rates of energy intensity for coal and hydropower were decreasing, resulting from the production technology being more energy-intensive than before; the energy intensity changes of petroleum firstly increased substantially and then decreased moderately.