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.

Interactions of the developmental regulator ABI3 with proteins identified from developing Arabidopsis seeds.

Abstract: The ABI3 locus is a major regulator of embryo development in Arabidopsis and is essential for the simultaneous activation of the maturation pathway, as well as repression of germination and seedling development. We used a two-hybrid screen in yeast in order to identify proteins that interact with ABI3. Four ABI3-interacting proteins (AIPs) were identified which showed specific in vivo and in vitro interactions with the C-terminal region of ABI3 that contains the B2 and B3 domains, previously shown to have DNA binding activity. The expression characteristics of the genes encoding the AIPs have also been analysed in wild-type and abi3, lec1 and fus3 embryo mutants. This analysis demonstrated differential expression of these genes during normal embryo development and in the mutant lines. All the AIPs show homology to existing transcription factors and therefore they may function with ABI3 within the network of transcriptional regulators that control embryo development in Arabidopsis.

Processes controlling soil phosphorus release to runoff and implications for agricultural management

Abstract: Phosphorus (P) loss from agricultural land to surface waters is well known as an environmental issue because of the role of P in freshwater eutrophication. Much research has been conducted on the erosion and loss of P in sediments and surface runoff. Recently, P loss in sub-surface runoff via agricultural drainage has been identified as environmentally significant. High soil P levels are considered as a potential source of P loss. However, without favourable hydrological conditions P will not move. In this paper, we review the basis of soil P release into solution and transport in surface and sub-surface runoff. Our objectives are to outline the role of soil P and hydrology in P movement and management practices that can minimize P loss to surface waters. Remedial strategies to reduce the risk of P loss in the short-term are discussed, although it is acknowledged that long-term solutions must focus on achieving a balance between P inputs in fertilizers and feed and P outputs in production systems.

Cut growth and fatigue of rubbers. I. The relationship between cut growth and fatigue

Abstract: The relationship between the cut growth and fatigue failure of natural rubber vulcanizates under repeated loading is examined. The cut growth behavior has been investigated using several types of test piece, and the results are shown to be consistent when interpreted in terms of the tearing energy concept developed previously. The most comprehensive data have been obtained by measuring the growth of a small cut in the edge of a strip cycled in simple extension. It is found that the cut growth per cycle is approximately proportional to the square of the maximum tearing energy attained during the cycle. Using this relation, the fatigue life of a specimen containing a small cut is deduced from elasticity theory as a function of initial cut size and maximum strain. Experimental results give good agreement with theory. A similar strain dependence is found for the fatigue life of die-stamped dumbbell test pieces with no intentionally produced flaws; this is consistent with the mechanism of failure bein...

Field incorporation of straw and its effects on soil microbial biomass and soil inorganic n

Abstract: The fumigation-extraction method was used to measure changes in soil microbial biomass in a field experiment following incorporation of 10 t ha−1 wheat straw, with and without 100 kg N ha−1 (as NH4NO3). into a silty clay loam soil in autumn 1987. The first measurements were 7 days after straw incorporation and then periodically for ca 1 yr. The amount of biomass (measured as biomass C. N and ninhydrin-reactive N) roughly doubled (from initial levels of ca 340 kg C. 76 kg N and 17 kg ninhydrin-N ha−1) within 7 days of straw incorporation, remained constant for the next 27 days and then slowly declined. The increase in biomass was similar when N was incorporated with the straw, although maximal amounts were a little greater (by ca 30 kg N ha-) and attained a little later (14 days after incorporation). At the last sampling (363 days after incorporation) the biomass had declined to about half of its size shortly after straw addition; this was still ca 20% more than in the unamcnded soil. Initial soil inorganic N contents were small (< 10 kg N ha−1) so that the rapid increase in biomass in the soil amended with straw alone could not be explained by immobilization of inorganic N. Similarly, in the soil receiving straw and 100 kg ha−1 inorganic N. nearly all of this N was still present in inorganic form 7 days after straw incorporation, yet by this time the biomass had increased by ca 50kg N ha−1. In both treatments, most of the newly synthesized biomass probably cnmc from N already present in the straw. Although straw incorporation increased the size of the biomass, there were no significant differences in biomass C to N ratios, or in biomass C to ninhydrin-N ratios between treatments and at different times. The mean ratios were biomass C/N = 4.7; biomass C/ninhydrin-N = 21.4; biomass N/ninhydrin-N = 4.6. A feature of this work is the extraction of relatively large samples of soil for biomass measurements with minimal sample preparation; a procedure that gave reproducible results even with the very heterogeneous mixtures of soil and straw encountered.