The Hertz Corporation

About: The Hertz Corporation is a based out in . It is known for research contribution in the topics: Population & Soil water. The organization has 9562 authors who have published 11044 publications receiving 447929 citations. The organization is also known as: Hertz Rental Car & Hertz Rent-a-Car.

Collagenase Inhibitors: Their Design and Potential Therapeutic Use

Abstract: (1987). Collagenase Inhibitors: Their Design and Potential Therapeutic Use. Journal of Enzyme Inhibition: Vol. 2, No. 1, pp. 1-22.

The determination of ionic diffusion coefficients in field soils. i. diffusion coefficients in sieved soils in relation to water content and bulk density

Abstract: Summary A method for measuring diffusion coefficients in large cores of structured field soils has been developed and tested, in the first instance using sieved soil. Bromide-chloride and bromide-nitrate counter diffusion coefficients have been determined using ion exchange membranes as sinks for the diffusing ions. The effects of membrane selectivity, soil surface preparation, solution concentration, water content and bulk density have been investigated. The organic colloid content appears to have a considerable influence on the impedance factor-water content relationship of a soil. Increasing the bulk density at constant volumetric water content linearly reduced the impedance factor by up to 30 per cent. The relationship between impedance factor and bulk density is discussed.

Salicylic acid-induced accumulation of glucosinolates in oilseed rape (Brassica napus L.) leaves

Abstract: Applying a salicylic acid soil drench to oilseed rape plants increased the concentration of glucosinolates in their leaves. The intensity of this «induction» depended on the concentration of salicylic acid applied and the age of the leaf: developing leaves retained enhanced levels of glucosinolates longer than mature leaves. 2-Phenylethylglucosinolate showed the greatest increase in concentration, with only minor increases in other glucosinolates in developing leaves. This response to salicylic acid is more specific than that observed following fungal infection or damage by herbivores. The results presented here are among the first to demonstrate an increase in secondary metabolite content in response to salicylic acid

Applications of fertilizer cations affect cadmium and zinc concentrations in soil solutions and uptake by plants

Abstract: Summary A pot experiment was conducted to study changes over time of Cd and Zn in soil solution and in plants. Radish was grown in a soil which had been contaminated with heavy metals prior to 1961. Constant amounts of a fertilizer solution (NH4NO3, KNO3) were added daily. Soil solution was obtained at intervals by displacement with water. The cumulative additions of small amounts of fertilizers were made equal to the plants' requirements at the final harvest but were found to exceed them during most of the experiment. Excess fertilizers caused substantial increases of major (K, Ca, Mg) and heavy-metal (Cd, Zn) ions in soil solutions and a decrease in soil pH, probably due to ion-exchange mechanisms and the dissolution of carbonates. Uptake of Cd and Zn into leaves was correlated with the mass flow of Cd (adjusted r2= 0.798) and Zn (adjusted r2= 0.859). Uptake of K, Ca and Mg by the plants was independent of their concentrations in solution. It is concluded that, in order to study effects of plants on heavy-metal availability and obtain soil solution that has not been altered by fertilizer ions, nutrients must be added according to the needs and growth of the plants. This could be achieved by linking fertilizer additions to the rate of transpiration, as nutrient uptake and transpiration were closely correlated in this experiment.