منابع مشابه
Day-night Differences in the Accumulation and Translocation of Ions by Tobacco Plants.
More K(42), Rb(86), and Br(82) was accumulated by intact tobacco plants and root systems from detopped plants during the night than during the day when studies for both periods were made in dark rooms controlled at 18 degrees . More, however, was translocated to shoots during the day than during the night in intact plants. This latter effect parallels the periodicity of exudation in root system...
متن کاملCopper in plants
Copper is an essential metal for normal plant growth and development, although it is also potentially toxic. Copper participates in numerous physiological processes and is an essential cofactor for many metalloproteins, however, problems arise when excess copper is present in cells. Excess copper inhibits plant growth and impairs important cellular processes (i.e., photosynthetic electron trans...
متن کاملPlants, genes and ions
Ionic homeostasis is a fundamental cellular phenomenon. All living cells maintain an intracellular ionic composition compatible with their constituent molecules, and this requires the regulation of multiple membrane transporters and signal transduction pathways. Other biophysical parameters such as turgor and electrical potential are also part of this essential regulation. How ionic homeostasis...
متن کاملapplication and construction of carbon paste modified electrodes developed for determination of metal ions in some real samples
ساخت الکترودهاِی اصلاح شده ِیکِی از چالشهاِی همِیشگِی در دانش شیمِی بوِیژه شیمِی تجزیه مِی باشد ،که با در نظر گرفتن سادگِی ساخت، کاربردی بودن و ارزان بودن روش مِی توان به باارزش بودن چنِین سنسورهاِی پِی برد.آنچه که در ادامه آورده شده به ساخت و کاربرد الکترودهاِی اصلاح شده با استفاده از نانو ذرات در اندازه گِیرِی ولتامترِی آهن وکادمِیم اشاره دارد. کار اول اختصاص دارد به ساخت الکترود خمِیر کربن اصلاح شده با لِیگاند داِ...
15 صفحه اولThe regulation of ammonium translocation in plants.
Much controversy exists about whether or not NH(+)(4) is translocated in the xylem from roots to shoots. In this paper it is shown that such translocation can indeed take place, but that interference from other metabolites such as amino acids and amines may give rise to large uncertainties about the magnitude of xylem NH(+)(4) concentrations. Elimination of interference requires sample stabiliz...
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ژورنال
عنوان ژورنال: Nature
سال: 1946
ISSN: 0028-0836,1476-4687
DOI: 10.1038/157666a0