重庆中央公园植物配置特色及建议

位于重庆两江新区同茂大道和节庆大道的重庆中央公园,为世界三大开放式城市中心公园之一。从充分利用乡土植物、注重植物空间层次搭配、比较重视色叶植物的运用、运用较多的地被植物、大型景观树有运用几个方面总结该园植物配置特色和亮点。针对现场观察到的问题,提出建议:政府持续重视,开展科研工作,改进植物配置。     

荔枝的保色贮藏法

荔枝为果中珍品,但保鲜难度极大,熟果在常温下存放3—5天即发生褐变、干缩或腐败,商品价值大大降低。通用的简便贮藏方法有两种:1、低温加限气贮藏法杀菌后的荔枝装入保鲜袋,密封袋口,置于1—5℃低温环境下贮藏;2、坛藏法杀菌后的荔枝装入坛内(坛口要小),密封坛口,埋于阴凉通风处的沙土中。2法的原理同1法     

Relative efficacy of organophosphorus insecticides against susceptible and resistant strains of the strike blowfly Lucilia cuprina (Calliphoridae) in New Zealand sheep

Four groups of five Romney lambs were treated by plunge dipping with one of four registered organophosphorus flystrike preventatives. Untreated lambs acted as controls. The sheep were challenged at weekly intervals with larval implants of organophosphate-susceptible and -resistant strains of Lucilia cuprina. All four treatments provided 19-21 weeks protection against susceptible larvae but chlorfenvinphos provided the longest protection (16-17 weeks), followed by propetamphos (15-16 weeks), dichlofenthion (10-13 weeks) and diazinon (9-13 weeks), against the resistant strain.     

Eosinophilic papulocrustous dermatitis (miliary dermatitis) and eosinophilic inflammatory bowel disease in two cats

Two cats with chronic eosinophilic skin disease were investigated. The clinical investigation of the skin disease in one cat was limited and inflammatory bowel disease was diagnosed post mortem. A history of weight loss and a palpably thickened bowel in the second cat suggested concurrent gastrointestinal disease. Diagnosis of inflammatory bowel disease was confirmed on biopsy. Treatment with azathioprine and methylprednisolone acetate resolved the signs of gastrointestinal disease, the pruritus and 95% of the skin lesions. The concurrence of eosinophilic papulocrustous dermatitis and eosinophilic bowel disease raises the possibility of their being linked bv a common aetiology or pathophysiology.     

Gulf stream: velocity fluctuations during the late cenozoic

Biostratigraphic analysis of seven piston cores from the southeastern Blake Plateau suggests that the upper Miocene to Recent sedimentary section at this location represents a history of deposition of calcareous ooze alternating with current-induced nondeposition or erosion. This record is primarily a result of long-term fluctuations in the velocity of the western boundary current or Gulf Stream, which sweeps the plateau. High-velocity phases of this current system, as signaled by hiatuses in the section, lie within the time limits 4.8 to 6.1, 3.9 to 4.4, 2.3 to 2.9, and 0 to 1.5 million years before present (B.P.). These time intervals are coeval with dated episodes of climatic decline and glaciation. The most intense acceleration of the Gulf Stream, as indicated by deep erosion of the Blake Plateau, occurred in the latest Miocene to earliest Pliocene (4.8 to 6.1 million years B.P.) in conjunction with a major expansion of the Antarctic ice cap. Subsequent accelerations of the Gulf Stream coincide with early Pliocene cooling in the Southern Hemisphere, worldwide expansion of high-altitude-high-latitude glaciers in the late Pliocene, and the classical glaciations of the Pleistocene. An additional, protracted increase in the average velocity of the Gulf Stream, which began in the late Miocene and culminated in the mid-Pliocene (about 3.8 million years B.P.), can be attributed to the gradual emergence of the Central American isthmus.     

卖果难出路何在

近两年水果获大丰收 ,价格一跌再跌 ,销售形势愈显严峻。困扰我们的“卖果难”话题 ,又一次摆到面前来。与此同时 ,在我国一些大城市的超市或水果市场的进口洋水果 ,不论是苹果、柑橘、梨、葡萄 ,还是猕猴桃、香蕉、芒果、布朗李等 ,不但比国产同类水果价格高出很多 ,而且卖得快。国产水果比洋水果到底差在哪里呢 ?除了品种、品质等因素外 ,还有一个易被大多数果品生产者和中间商忽略的环节 ,那就是采后处理。国外的水果多在采前 7天～ 10天 ,喷 1次杀菌剂 ,成熟采收 ,然后进行清洗、打蜡、分级和包装外运或入库。这就是洋水果光洁耐贮的秘…     

15种蔬菜将成市场新宠

菌类蔬菜 :指在各种作物秸秆等农业副产品上接入不同食用菌种后 ,生产出的各种鲜活食用菌产品。菌类产品 ,不施用化肥、农药 ,纯属绿色食品 ,其营养高、疗效好的食用价值 ,被国际上公认为健康食品 ,有关人士预言 ,未来的餐桌消费 ,将是“无菌不成食” ,市场前景极好。野生蔬菜 :营养丰富 ,具有一定药用价值 ;且远离工业污染 ,又不施用化肥、农药等 ,纯属天然食品 ,如蕨菜、荠菜、苦菜、刺儿菜、蒲公英、野苋菜、曲曲牙以及蒲菜等。花卉蔬菜 :鲜花内含蛋白质、淀粉、脂肪、氨基酸和微量元素等 ,经常食用 ,其保健作用明显 ,如韭菜花、梅花、桂…     

Interaction of curcumin with phosphatidylcholine: A spectrofluorometric study

Curcumin [1,7-bis(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3, 5-dione], the main constituent of the rhizomes of the plant Curcume longa L. (turmeric), is a powerful antioxidant in both enzymatic and nonenzymatic systems. The interactions of curcumin with egg and soy phosphatidylcholine were followed by fluorescence spectroscopy. Curcumin had very weak fluorescence in aqueous system, which was enhanced in apolar environments. Curcumin emitted at 490 nm after being excited at 451 nm in phosphatidylcholine micelles. The equilibrium constants for the interaction of curcumin with egg and soy phosphatidylcholine were (3.26 +/- 0.2) x 10(5) and (2.64 +/- 0.2) x 10(5) M(-1), respectively. From the Scatchard plot of the fluorometric data, it was inferred that one molecule of curcumin could bind six molecules of phosphatidylcholine. The equilibrium constant for the phosphatidylcholine-curcumin interaction decreased with temperature, indicating the amphiphilic nature of curcumin. The DeltaG, DeltaH, and DeltaS values obtained for the interaction of egg phosphatidylcholine-curcumin were -7.8 +/- 0.3 kcal/mol, -9.6 +/- 0.4 kcal/mol, and -6.8 +/- 0.2 cal/mol/K, respectively. The fluorescence anisotropy measurements of curcumin with phosphatidylcholine suggested that the anisotropy of the curcumin molecule did not change in phosphatidylcholine. The interaction of divalent metal ions with phosphatidylcholine-curcumin in comparison with phosphatidylcholine-1-anilino-8-naphathalenesulfonic acid complex suggested the strong binding of curcumin to metal ions.