玉米种子的安全贮藏与越冬贮藏管理要点

种子收获初期的含水量较高,自身气温较低,不易晒干,如果遇到寒冷环境,容易受冻。因此,如何安全越冬是东北地区玉米种子贮藏管理的重点。     

栗子贮藏保鲜

民间贮藏栗子的方法很多,如采摘尚未完全成熟的带总苞的栗子放在萝筐内,加盖后筐口朝下放在室内通风的沙土地上,让它后熟与保鲜,通常可以保鲜4—5个月。也有将板栗煮熟后用线串连起来,挂在室内阴干处可长期保存,但吃前要放在水中浸一段时间。近年还有人将成熟的板栗泡在水桶里,去除浮水的栗子,     

哈密瓜贮藏保鲜的研究 Ⅰ.贮藏期间果实呼吸作用与贮藏性的关系

果实贮藏与呼吸作用有密切关系。耐藏品种“密极甘”比不耐藏品种“红心脆”呼吸强度低,而且持续的时间长。糖分含量的变化与呼吸作用关系甚大。新采收的“密极甘”果实,呼吸强度和总糖含量均较低,经过一段贮藏后,呼吸强度增高,出现高峰,此时总糖含量最高;随着贮藏时间的延续,呼吸强度下降,总糖含量也逐渐减少。     

超干贮藏提高梭梭种子的耐贮藏性

梭梭 (HaloxylonammodendronBge .)的种子为短命种子 ,在自然状态下 ,种子的含水量为 8.5 % ,寿命约为 10个月。将梭梭种子含水量降至 2 .5 %和 1.4% ,其耐贮藏力增强。经过 5 0℃下 5d和 10d的人工加速老化后 ,超干种子表现出较强的抗老化能力。与对照相比 ,超干种子具有较高的萌发率、活力指数及较长的根 ,其细胞膜具有较低的电导率和较高的脱氢酶活性     

超干贮藏提高梭梭种子的耐贮藏性

梭梭(Haloxylon ammodendron Bge.)的种子为短命种子,在自然状态下,种子的含水量为8.5%,寿命约为10个月.将梭梭种子含水量降至2.5%和1.4%,其耐贮藏力增强.经过50 ℃下5 d和10 d的人工加速老化后,超干种子表现出较强的抗老化能力.与对照相比,超干种子具有较高的萌发率、活力指数及较长的根,其细胞膜具有较低的电导率和较高的脱氢酶活性.     

葡萄的贮藏保鲜

葡萄果实属于浆果类，柔软多汁，含糖量较高。由于葡萄皮薄、汁液多，果柄部分组织结构疏松，采后容易干柄脱粒和腐烂。所以，搞好葡萄的保鲜对促进农村经济的发展，为消费者保障均衡的季节供应都有好处。根据葡萄果实的特点，可以采用以下几种保鲜方法： 一、采前处理 果园于采摘前一个星期停止浇水，采收当天喷５００ｐｐｍ的扑海因杀菌剂，以控制采后贮藏病害；或喷洒５０ｐｐｍ奈乙酸以防止葡萄落粒。最好选择晴天将药液兑好后，直接喷洒于果穗上，待药液干后即可采摘。 二、采收 葡萄果实采后没有呼吸高峰，也没有后熟作用，因此葡萄…     

板栗的采收贮藏

板粟富含蛋白质、脂肪、碳水化合物、淀粉以及维生素Ａ、Ｂ１、Ｂ２、Ｃ、矿物质和脂肪酶等多种营养物质，既可加工也可鲜食，是一种具有很高经济价值的作物。我国主要分布于河北、山东、河南、湖北、广西、贵州、江苏、浙江和北京等地。下面简单介绍板栗果实采收时，需要注意的事项和贮藏方法： １．采收前 目前国内板栗的种植比较分散，不利于管理，加重了采后板粟果实的病害，这一情况在南方尤为严重。因此，必须加强土肥水及修剪的管理，使植株生长健壮并且适时打药，以控制果园病虫害。 ２．采收时期 板栗果实要完全成熟后才可采收，不…     

金针菇保鲜贮藏研究

金针菇经过PE袋包装、减压、充气、低温等处理进行保鲜贮藏,经测定结果表明,各处理组的水份丧失、干物质消耗、呼吸强度和粗纤维的含量均比对照低,可溶性固形物、可溶性糖、蛋白质和维生素C的含量虽比贮前略低,但均比对照高。从外观观察,各处理均有较好的保鲜作用。     

食用菌贮藏保鲜研究

食用菌贮藏保鲜研究李惠民,贺军民食用菌味道鲜美,营养丰富,国内外需求量很大。但常由于保鲜技术不过关,致使其品质、色泽、风味在短时间内骤变,严重影响其商品价值,造成经济上的巨大损失。故研究食用菌的贮藏保鲜有着重要的意义。本文的目的就在于阐明食用菌变色腐...     

玉米贮藏技术研究进展

综述了玉米的贮藏特性、国内外玉米贮藏技术和研究进展,并对今后的研究方向进行了展望,以期对玉米原粮储藏技术的发展具有一定的指导意义。     

Investigation of the mechanism of temperature sensitivity of the electroreceptors of ampullae of lorenzini

In experiments on Black Sea skates (Raja clavata), the potential of the receptor epithelium of the ampullae of Lorenzini and spike activity of single nerve fibers connected to them were investigated during electrical and temperature stimulation. Usually the potential within the canal was between 0 and –2 mV, and the input resistance of the ampulla 250–400 k. Heating of the region of the receptor epithelium was accompanied by a negative wave of potential, an increase in input resistance, and inhibition of spike activity. With worsening of the animal's condition the transepithelial potential became positive (up to +10 mV) but the input resistance of the ampulla during stimulation with a positive current was nonlinear in some cases: a regenerative spike of positive polarity appeared in the channel. During heating, the spike response was sometimes reversed in sign. It is suggested that fluctuations of the transepithelial potential and spike responses to temperature stimulation reflect changes in the potential difference on the basal membrane of the receptor cells, which is described by a relationship of the Nernst's or Goldman's equation type.I. P. Pavlov Institute of Physiology, Academy of Sciences of the USSR, Leningrad. I. M. Sechenov, Institute of Evolutionary Physiology and Biochemistry, Academy of Sciences of the USSR, Leningrad. Pacific Institute of Oceanology, Far Eastern Scientific Center, Academy of Sciences of the USSR, Vladivostok. Translated from Neirofiziologiya, Vol. 12, No. 1, pp. 67–74, January–February, 1980.     

Principles of organization and evolution of systems of regulation of functions

Evolution of living organisms is closely connected with evolution of structure of the system of regulations and its mechanisms. The functional ground of regulations is chemical signalization. As early as in unicellular organisms there is a set of signal mechanisms providing their life activity and orientation in space and time. Subsequent evolution of ways of chemical signalization followed the way of development of delivery pathways of chemical signal and development of mechanisms of its regulation. The mechanism of chemical regulation of the signal interaction is discussed by the example of the specialized system of transduction of signal from neuron to neuron, of effect of hormone on the epithelial cell and modulation of this effect. These mechanisms are considered as the most important ways of the fine and precise adaptation of chemical signalization underlying functioning of physiological systems and organs of the living organism