freepeople性欧美熟妇, 色戒完整版无删减158分钟hd, 无码精品国产vα在线观看DVD, 丰满少妇伦精品无码专区在线观看,艾栗栗与纹身男宾馆3p50分钟,国产AV片在线观看,黑人与美女高潮,18岁女RAPPERDISSSUBS,国产手机在机看影片

正文內(nèi)容

大量元素鉀ppt課件(編輯修改稿)

2025-05-30 22:05 本頁面
 

【文章內(nèi)容簡介】 中國最大鉀肥生產(chǎn)基地的第一步,一期建成 20萬噸硫酸鉀廠,最終計劃是年產(chǎn) 220萬噸鉀肥。 K is the seventh most abundant element in the earth’s crust ranging from to %. But the available K is only 12% of total K. Potassium in soil Forms: Total K consists of four distinct forms in the soil, each of different availability to the plant: (ⅰ ) Mineral Kalmost pletely unavailable, 90~98%。 (ⅱ ) Fixed Kslowly available, 110%。 (ⅲ ) Exchangeable Kreadily available, 12%。 (ⅳ ) Soil solution Kreadily available, %. There is an equilibrium between the various forms Organic K is only a small part. Release and fixation of K+ and NH4+ ions by soil clay Section 2 Molecular and physiological aspects of potassium uptake in plants K is the most abundant cellular cation, with cytoplasmic concentrations regulated between 80 and 200 mM, and total tissue concentrations of approximately 20 mM. The transport of K+, which is mobile in plant, has been studied intensively for the last 50 years. K+轉(zhuǎn)運進入植物和在植物中運輸?shù)哪J綀D 2. 1 Early Physiological and biochemical studies indicated the existence of multiple K+ transporters Excited roots (Hoaglant and Broyer, 1936) Epstein was first to treat radioisotopes to quantify ion efflux. Epstein was first to treat mineral ion transporters as enzyme kiics to studies of concentrationdependent root K+ uptake. Dual isotherm of K absorption Highaffinity K+ transport was thought to dominate at low concentration of K+ in soil, whereas as higher K+ concentrations, a lowaffinity K+ transporter operated that was less specific for K+ over other alkali cations. 硫基修飾的 N –乙基馬來亞銨( NEM) :抑制髙親和力轉(zhuǎn)運蛋白但不影響低親和力轉(zhuǎn)運蛋白。 Physiological studies provided further evidence for separate high and lowaffinity K+ transporters The application of a K+ channel blocker TEA (四乙銨 ) inhibited the linear, lowaffinity transport ponent. Highaffinity K+ uptake system exhibited several properties: Increasing gene expression or transport activity induced by K+ starvation。 A very high affinity for K+ (Km=5 to 30 181
點擊復(fù)制文檔內(nèi)容
教學(xué)課件相關(guān)推薦
文庫吧 www.dybbs8.com
備案圖片鄂ICP備17016276號-1