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PTEN is a candidate tumor suppressor which has sequence homology withdual-specifici-ty phosphatase. PTEN is a multifunctional protein endowed with a phosphatase activity capable of dephosphory-lating both tyrosine phosphate, serine/threonine phosphate residues on proteins and phospholipids of the phosphati dylinositol pathway. PTEN appears to be mutated at considerable frequency in several types of humantumors, including those frombrain, breast, endometrium, and prostate. PTEN play an important role in pathogenesis of tumor, tumor cell invasion and metastasis. In this review, we will discuss the chemical structure of PTEN, its phosphatase activity, the ability of affecting signal transduction, and its mutational status in cancer. 相似文献
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阐述了现代园林的基础知识,并通过对园林绿化生态效益的分析,概括了现代园林绿化的新概念及在城镇规划中的作用,并浅析如何在城镇中进行现代生态园林绿化的应用。 相似文献
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在乙醇：龙眼果皮＝ １００∶４（ｖ／ｗ ）、７０ ℃、１００ ｍ ｉｎ 的最佳条件下,ｐＨ ４．５２,λＲｍａｘ＝ ３７０ ｎｍ ,呈鲜黄色。龙眼黄色素（Ｒ）乙醇提取液的ｐＨ、光、热、离子、共存物对Ｒ的稳定性有不同的影响。综合考虑各种影响因素,用Ａ、Ｂ、Ｃ保鲜剂、浸果３ ｍ ｉｎ 后,分别于室温、１５、－ １０ ℃下贮藏１０、３０、６０ｄ,龙眼的好果率为８７ ％ 、９５ ％ 、１００ ％ ,损耗率为１４ ％ ～０,基本保持果壳原色和果肉的色泽、风味、品质,取得了护色保鲜的效果 相似文献
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国家蔬菜工程技术研究中心共收集苋菜及部分野生蔬菜资源1070份。按食用器官分类，共分为七大类数十个种类，显示出我国蔬菜遗传资源的多样性。分析测定了703份野生蔬菜的营养成分。针对目前我国在野生蔬菜资源的基础研究和开发利用中存在的问题，提出了相应的对策。 相似文献
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The early-1990s’ war in former Yugoslavia led to severe damage to the urban and peri-urban forests of Sarajevo, capital of Bosnia and Herzegovina. During the Siege of Sarajevo (April 1992–March 1996), after the energy supplies to the city had been cut off, over three-quarters of all urban trees and nearly all peri-urban trees within the siege line were cut down for firewood by the desperate residents. After the war, the city trees were quickly and effectively replanted, and Sarajevo provides a useful case study of urban forest recovery. This study presents the observations and measurements, of trees that survived the war and the trees planted after the war, made in Sarajevo in May 2008. We summarize the lessons learned from the Sarajevo experience, regarding both damage and replanting, which include the close relationship between the urban tree damage and the specifics of military operations, the importance of the initial planting stock, and the advantages of collaboration between academic researchers and urban forest managers. 相似文献
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不同来源桃种质果实糖酸组分含量特点的研究 总被引：22，自引：0，他引：22
对桃24个中国地方品种、19个中国育成品种、2个新疆桃栽培品种及5个中国野生种、33个欧美品种和16个日本品种共99份种质的果实糖酸组分含量特点进行了研究。结果表明, 桃果实中的可溶性糖和酸主要是蔗糖和苹果酸, 分别约占总可溶性糖的73%和总酸的60%; 大多数种质中果实内的葡萄糖和果糖含量相近, 但1个中国野生种和部分地方品种果实内的果糖含量较低, 果糖/葡萄糖低于0120; 中国育成品种果实的蔗糖平均含量最高, 而中国野生种果实蔗糖含量则显著低于其他种质; 中国育成品种、日本品种和欧美品种果糖平均含量显著高于中国地方品种和野生种; 中国野生种的总酸含量最高, 其次为欧美品种, 中国地方品种、中国育成品种和日本品种相对较低; 欧美品种果实平均苹果酸和柠檬酸含量高于中国地方品种和育成品种及日本品种。另外, 果实内蔗糖与山梨醇含量呈显著正相关; 苹果酸与柠檬酸之间以及奎宁酸与莽草酸含量之间呈极显著正相关。 相似文献
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WANG Kai-fu LU Fu-er XU Li-jun YANG Ming-wei ZOU Xin LI Ming-zhen YE Wang-yun 《园艺学报》2006,22(1):135-138
AIM: To explore the therapeutic strategies of heat-clearing and detoxifying (HCDT) and Yin-invigorating and fluid-supplementing (YIFS), the method of Chinese medicine, on the high density lipoprotein (HDL) and alkaline phosphatase (ALP) molecules, which are associated with endotoxin-degradation. METHODS: The animal model of endotoxemia was established by the injection of E. Coli lipopolysaccharides through rabbits ear vein. The endotoxemic rabbits were treated respectively with two representative herbal preparations of therapeutic principles against febrile diseases: HCDT or YIFS preparations. The serum levels of interleukin-1 (IL-1), tumor necrosis factor α (TNF-α) and HDL, the ALP activity, the expression of ALP mRNA in liver and kidney tissues were observed. RESULTS: The serum levels of IL-1 and TNF-α in HCDT group were significantly decreased, while the serum ALP activity and the expression of ALP mRNA in liver and kidney tissues were obviously increased, as compared with those in model group. Meanwhile, the serum levels of IL-1 and TNF-α in YIFS group were significantly reduced, and its plasma HDL level was elevated. CONCLUSIONS: Both the herbal preparations, HCDT and YIFS, have the scavenging effects on the overproduction of inflammatory cytokines such as IL-1 and TNF-α induced by endotoxin, but their effects on the endotoxin-degrading molecules might be different. HCDT principally increases ALP activity and enhances ALP expression in liver and kidney tissues, while YIFS might preferably facilitate the elevation of plasma HDL level. 相似文献
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The effects of combinations of salinity (no salt, 2000 p.p.m. or 4000 p.p.m. of CaCl2 and NaCl, 1:1) and water table (30 cm, 60 cm or 90 cm from the soil surface), on the vegetative growth and tolerance of ‘Golden Japanese’ plum and ‘Mit Ghamre’ and ‘Balady’ peaches were studied. The plants were grown in lysimeters. The growth of the trunk, total shoot length, the increase in shoot length per cm and the fresh weight of top, root and total plant were reduced with increasing salinity of the irrigation water. The effect was accentuated when the plants were maintained at high water table level. The salinity treatments resulted in the death of 43%, 73% and 76% of the plants in the plum, and the ‘Mit Ghamre’ and ‘Balady’ peaches, respectively, indicating that the plum is more tolerant to salinity than the peach. The plants of the salinity treatments showed various symptoms of salt injury, such as leaf burn, defoliation, shoot die-back and finally death. In the peaches, salt injury started to occur in the first growing-season, whereas the salt injury appeared in the plum in the second growing-season. The symptoms were more pronounced in the 4000 p.p.m. treatment than in the 2000 p.p.m. treatment and were more pronounced at the high water table level. The salinity level was the predominant factor and the effect of the water table on the vegetative growth diminished with increase in the salinity level of the irrigation water. 相似文献
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杜鹃花常见病虫害及其防治 总被引：1，自引：0，他引：1
杜鹃为我国十大传统名花之一,病虫害的发生是影响杜鹃花正常生长的主要原因之一。文章主要阐述了危害杜鹃花的病虫害的形态特征、发生特点及防治方法。 相似文献
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为了探讨不同灌溉方式和氮、磷、钾配比对大葱产量及水肥生产效率的影响,研究了3种灌溉方式(滴灌、喷灌、沟灌)下8个施肥配比(N_PK_0、N_0PK、NP_0K、NP_0K_0、N_0PK_0、N_0P_0K、N_0P_0K_0和NPK)处理对元臧大葱产量及水肥生产效率的影响。结果表明:滴灌较沟灌显著增加大葱产量,提高N、P、K吸收量与肥料利用率,同时还提高了水分生产效率及灌溉水利用效率。肥料配比以NPK处理(N 500 kg·hm~(-2)、P_2O_5 400 kg·hm~(-2)、K_2O 600 kg·hm~(-2))的大葱产量较高,减施其中一种肥料次之,单施N、P、K肥料则产量较低,同时NPK处理还提高了大葱各器官N、P、K积累量与肥料利用率。因此,大葱在滴灌方式下,采用全量施肥的NPK处理灌溉施肥制度最为合理。 相似文献
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K. Hamada K. Hasegawa A. Kitajima T. Ogata 《The Journal of Horticultural Science and Biotechnology》2013,88(2):218-222
SummaryTo determine the anatomical basis for differences in fruit size in Japanese persimmon (Diospyros kaki Thunb.), the number and sizes of parenchymal cells were measured in four astringent cultivars and in wild D. lotus over a single season in Japan. Fruit weight at harvest correlated with the final number of parenchymal cells (r = 0.95*) and their size (r = 0.92*). There was also a correlation between fruit diameter and the number of cell layers at full bloom (r = 0.93*), which increased 1.7 – 1.9-fold during fruit development.The duration of cell division and the sizes of the cells at full bloom were similar among the cultivars, whereas mean parenchymal cell lengths increased by 7.7-, 6.7-, 5.4-, 5.0- and 3.8-fold from full bloom to harvest in ‘Otanenashi’ (average fruit diameter = 96 mm), ‘Hiratanenashi’ (77 mm), ‘Saijo’ (54 mm), ‘Tsurunoko’ (44 mm), and D. lotus (20 mm), respectively. The final size of tannin cells was larger in ‘Otanenashi’ and ‘Hiratanenashi’ than in the other cultivars, including the wild species.These results indicate that the size of fruit at harvest was determined by the number of cells at full bloom, and their expansion during fruit development. 相似文献
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北京市蔬菜病虫害全程绿色防控技术体系及推广应用 总被引：1，自引：0，他引：1
为推进农药减量增效、病虫害可持续治理,保障首都农产品质量安全、农业生产安全和农业生态环境安全,总结了北京市蔬菜生产上常用的20多种核心绿色防控技术,包括全园清洁、无病虫害育苗、产前棚室和土壤消毒、产中综合防控和产后蔬菜残体无害化处理等,以不同的生产方式和生产环节进行集成,覆盖产前、产中、产后,形成全程绿色防控技术体系,并建立绿色防控示范基地,对绿色防控技术及时进行集成、示范、推广。目前,示范面积2 200 hm~2,在绿控基地内,可实现农产品农残检测合格率100%,绿色防控技术使用率100%,专业化统防统治比例在80%以上,平均施药次数减少5～13次,减少化学农药用量27%～42%,病虫防治效果提高20%以上,667 m~2节本增收10%以上。 相似文献
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海南辣椒主要病虫害及其防治技术 总被引：1，自引：0，他引：1
以科学发展观为指导,以当前国际旅游岛国家热带现代农业基地建设为契机,通过调查研究和文献资料分析,探讨海南辣椒生产中主要的病虫害以及防治技术,为海南辣椒生产及病虫害防治提供指导. 相似文献
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E. Putievsky 《The Journal of Horticultural Science and Biotechnology》2013,88(4):583-587
Oregano and sweet basil were grown in phytotron cabinets at 18/12°, 24/12° and 30/12°C (day/night) in either 10-or 16-h photoperiods. Only temperature had a positive influence on plant height in both species. The fresh yield was significantly influenced by temperature and daylength in all the three harvests examined for both species. The correlation between these results and field behaviour in different regions is discussed. The optimum temperature for the germination of oregano was a day/night regime of 24/19°C; sweet basil was less sensitive and germinated well at temperature regimes between 18/13° and 30/25°C. 相似文献
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酵母浸膏蛋白胨与pH对草菇培养与生物学效率影响 总被引：1，自引：0，他引：1
研究了酵母浸膏、蛋白胨和pH对草菇菌丝生长与生物学效率的影响。试验结果表明,在PDA培养基中加入酵母浸膏和蛋白胨能促进菌丝生长,最适添加质量浓度分别为0.30%酵母浸膏和0.50%蛋白胨。在栽培过程中,对菌丝体表面最佳喷施溶液组合为0.50%蛋白胨、0.30%酵母浸膏,调节溶液pH9.0,对比空白对照能提高生物学效率13.56%。 相似文献