[Nitrate pollution of drinking water from residential water supplies and wells for delivery of drinking water by water companies in the Diepholz district].
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Germany, West↗
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[Water-hygienic and chemical studies on the incidence and identification of taste affecting phenol compounds in bank filtered surface water and ground water with special regard to thin layer chromatographic technic of examination (Halle-Beesen Water Works)].
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Chlorine↗
Precursors to water-soluble dinitrogen carriers. Synthesis of water-soluble complexes of iron(II) containing water-soluble chelating phosphine ligands of the type 1,2-bis(bis(hydroxyalkyl)phosphino)ethane.
The reactions of the water-soluble chelating phosphines 1,2-bis(bis(hydroxyalkyl)phosphino)ethane (alkyl = n-propyl, DHPrPE; n-butyl, DHBuPE; n-pentyl, DHPePE) with FeCl(2).4H(2)O and FeSO(4).7H(2)O were studied as routes to water-soluble complexes that will bind small molecules, dinitrogen in particular. The products that form and their stereochemistry depend on the solvent, the counteranion, and the alkyl chain length on the phosphine. In alcoholic solvents, the reaction of FeCl(2).4H(2)O with 2 equiv of DHBuPE or DHPePE gave trans-Fe(L(2))(2)Cl(2). The analogous reactions in water with DHBuPE and DHPePE gave only cis products, and the reaction of FeSO(4).7H(2)O with any of the phosphines gave only cis-Fe(L(2))(2)SO(4). These results are interpreted as follows. The trans stereochemistry of the products from the reactions of FeCl(2).4H(2)O in alcohols is suggested to be the consequence of the trans geometry of the Fe(H(2)O)(4)Cl(2) complex, i.e., substitution of the water molecules by the phosphines retains the geometry of the starting material. The formation of cis-Fe(DHPrPE)(2)Cl(2) is an exception to this result because the coordination of two -OH groups forms two six-membered rings, as shown in the X-ray structure of the molecule. DHBuPE and DHPePE reacted with FeSO(4).7H(2)O in water to initially yield cis-Fe(P(2))(2)SO(4) compounds, but subsequent substitution reactions occurred over several hours to give sequentially trans-Fe(DHBuPE)(2)(H(2)O)(SO(4)) and then trans-[Fe(DHBuPE)(2)(H(2)O)(2)]SO(4). The rate constants and activation reactions for these aquation reactions were determined and are consistent with dissociatively activated mechanisms. The cis- and trans-Fe(L(2))(2)X (X = (Cl)(2) or SO(4)) complexes react with N(2), CO, and CH(3)CN to yield trans complexes with bound N(2), CO, or CH(3)CN. The crystal structures of the cis-Fe(DHPrPE)(2)SO(4), trans-Fe(DHPrPE)(2)(CO)SO(4), trans-Fe(DHBuPE)(2)Cl(2), trans-[Fe(DHBuPE)(2)(CO)(Cl)][B(C(6)H(5))(4)], trans-Fe(DMeOPrPE)(2)Cl(2), trans-Fe(DMeOPrPE)(2)Br(2), and trans-[Fe(DHBuPE)(2)Cl(2)]Cl complexes are reported. As expected from using water-soluble phosphines, the complexes reported herein are water soluble (generally greater than 0.5 M at 23 degrees C).
Journal Article↗
Induction of Frost Hardiness in Stem Cortical Tissues of Cornus stolonifera Michx. by Water Stress: I. Unfrozen Water in Cortical Tissues and Water Status in Plants and Soil.
Water supply and day length were varied in cold hardiness studies of red osier dogwood plants (Cornus stolonifera Michx.). The frost killing temperature, the content and freezing of stem cortical tissue water along with soil moisture content and tension were evaluated. Seven days of water stress in long and short day photoperiod regimes caused a rapid decrease in soil moisture content and plant water potential. During the same period, the frost hardiness increased from -3 to -11 C. Further water stress treatment had little effect. Control plants in short days showed only a gradual decrease in plant water potential and only gradually increased in frost hardiness while control plants in long days were unchanged. Freezing studies using nuclear magnetic resonance showed that increased hardiness in water-stressed plants resulted from both an increased tolerance of freezing and an increased avoidance of freezing, the latter resulting from higher solute concentration in the tissue solutions. The short day controls also showed similar changes; however, the changes were smaller over the 21 days of the study.
Journal Article↗
Water resources management within the water-protection zone of the "Donauried": solving conflicts between water supply, ecology and agriculture.
One of the tasks of sustainable water-quality and resources management must be to resolve conflicts between its demands and those of agriculture and ecology. In most industrial countries, there are conflicts between the different requirements of water supply, i.e. water quality, and those of agriculture and the conservation of wetlands, i.e. water quantify. Solving these conflicts means a reorganisation of land use. A non-governmental committee has initiated a voluntary compromise program for the water-protection zone of the Donauried. On the basis of criteria assessing the significance of areas of land, a plan for the reorganisation of land use has been developed. Moreover, an action plan has been prepared; it includes steps for reducing nitrate, a program for reducing land-use intensity, a concept for re-wetting bog areas and an investigation into measures for optimising local water resources using a numerical groundwater model. This was accompanied by an economic evaluation of the measures.
Agriculture↗
[Water-electrolyte and acid-base changes. IV. Water metabolism and water balance].
Two interrelated physiologic feedback systems, thirst and antidiuretic hormone, serve to regulate water balance, and thereby body fluid osmolality. These two systems share at least one common receptor component: a device for sensing body fluid tonicity, the hypothalamic osmoreceptor. The output of the osmoregulatory system is subserved by two distinct effector components: oral water ingestion and renal water excretion. Acting in concert, these two processes serve to maintain body fluid osmolality. Under normal circumstances body fluid osmolality is carefully maintained within precisely defined limits. For body fluid osmolality to remain constant, the amount of water lost each day (by insensible, gastrointestinal, and renal routes), must be replenished by the ingestion of water and, to a lesser extent, by the production of "metabolic" water from the catabolism of foodstuffs.
Body Fluid Compartments↗
Onsager heat of transport for water vapour at the surface of water and ice: thermal accommodation coefficients for water vapour on a stainless-steel surface.
The Onsager heat of transport Q* has been measured for water vapour at the surface of water, supercooled water, and ice, over the temperature range -8 to +10 degrees C. For liquid water, Q* is constant at -24.7 +/- 3.6 kJ mol(-1) (two standard deviations) over the pressure range 4-9.5 Torr. Provided the ice is suitably aged, the |Q*| values are very similar for water and ice, a result which is consistent with the presence of a liquid-like layer at the surface of ice. The values are slightly larger for ice, in proportion to the ratio of the heat of sublimation of ice to the heat of vaporization of the liquid. Departures from linearity of plots of P against DeltaT are attributed to temperature jumps at the surface of the dry upper plate. Hence jump coefficients and thermal accommodation coefficients have been derived as a function of temperature for collisions of water molecules with type-304 stainless steel.
Crystallization↗
Gradients in water potential and turgor pressure along the translocation pathway during grain filling in normally watered and water-stressed wheat plants.
The water relations parameters involved in assimilate flow into developing wheat (Triticum aestivum L.) grains were measured at several points from the flag leaf to the endosperm cavity in normally watered (Psi approximately -0.3 MPa) and water-stressed plants (Psi approximately -2 MPa). These included direct measurement of sieve tube turgor and several independent approaches to the measurement or calculation of water potentials in the peduncle, grain pericarp, and endosperm cavity. Sieve tube turgor measurements, osmotic concentrations, and Psi measurements using dextran microdrops showed good internal consistency (i.e. Psi = Psi(s) + Psi(p)) from 0 to -4 MPa. In normally watered plants, crease pericarp Psi and sieve tube turgor were almost 1 MPa lower than in the peduncle. This suggests a high hydraulic resistance in the sieve tubes connecting the two. However, observations concerning exudation rates indicated a low resistance. In water-stressed plants, peduncle Psi and crease pericarp Psi were similar. In both treatments, there was a variable, approximately 1-MPa drop in turgor pressure between the grain sieve tubes and vascular parenchyma cells. There was little between-treatment difference in endosperm cavity sucrose or osmotic concentrations or in the crease pericarp sucrose pool size. Our results re-emphasize the importance of the sieve tube unloading step in the control of assimilate import.
Membrane Potentials↗
[Implementation of the new drinking water regulation section sign 18: monitoring of drinking water systems in houses--water for public use].
The monitoring of drinking water based on the drinking water regulation is one of the central tasks of public health authorities in Germany. With the coming into force of the new drinking water regulation in the year 2003 also water supply plants "from which water is made available for the public, in particular in schools, kindergartens, hospitals, restaurants and other communal facilities" must be supervised for the first time (TrinkwV section sign 18). Thus, for Frankfurt/Main the number of the facilities/objects which are to be supervised rose from approx. 300 to approx. 4,700. Since appropriate expansion of personnel was not possible, innovative solutions were in demand for implementation of these tasks. These are introduced here.
Consumer Product Safety↗
[Effect of transition from sea water into sweet water and from sea water into oversalted water on respiratory changes of a goby (Gobius auratus and Gobius lota)].
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Animals↗
[Kinetics of the sodium exchange in an euryhaline teleost (Platichthys flesus flesus Linne) during successive sea water-fresh water-sea water passages, as a function of the length of stay in fresh water].
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Animals↗
[Sodium exchanges in a euryhaline teleost, Platichthys flesus flesus Linne: kinetics of these exchanges at the time of passage from sea water to fresh water and from fresh water to sea water].
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Animals↗
Water balance of small lactating rodents--III. Estimates of milk production and water recycling in lactating Mus musculus under various water regimes.
1. The exchanges of water between lactating female and young Mus musculus were modelled on the computer. 2. The model was used to estimate rates of milk production and water recycling in various litter sizes under various water regimes by following the time course of injected tritiated water. 3. The high correlation between estimated rates of milk production and actual growth rates of young was taken to indicate that the method gave if not the actual rates of milk production a very constant proportion of it. 4. Approximately 50% of the water secreted in milk is returned to the mother by recycling.
Animals↗
Liquid chromatography-mass spectrometry method to determine alcohol ethoxylates and alkylamine ethoxylates in soil interstitial water, ground water and surface water samples.
Alcohol ethoxylates (AEs) and alkylamine ethoxylates (AMEs) are used as adjuvants in pesticide formulations. Analytical procedures for these compounds in environmental aqueous samples using LC-MS are presented. Sample preparation uses solid-phase extraction with Porapak Rdx cartridges. Detection limits and recoveries in ground water and surface water are, respectively, AEs: 16-60 ng/l, 35-93% and AMEs: 0.3-6 microg/l, 28-96%. The lower recoveries are obtained for the apolar surfactants. The procedure was employed on samples of ground water and soil interstitial water collected from farming areas. The individual AEs were detected at concentration levels ranging from 33 to 189 ng/l water.
Alcohols↗
When is water not water? Exploring water confined in large reverse micelles using a highly charged inorganic molecular probe.
The interior water pool of aerosol OT (AOT) reverse micelles tends toward bulk water properties as the micelle size increases. Thus, deviations from bulk water behavior in large reverse micelles are less expected than in small reverse micelles. Probing the interior water pool of AOT reverse micelles with a highly charged decavanadate (V(10)) oligomer using (51)V NMR spectroscopy shows distinct changes in solute environment. For example, when an acidic stock solution of protonated V(10) is placed in a reverse micelle, the (51)V chemical shifts show that the V(10) is deprotonated consistent with a decreased proton concentration in the intramicellar water pool. Results indicate that a proton gradient exists inside the reverse micelles, leaving the interior neutral while the interfacial region is acidic.
Dioctyl Sulfosuccinic Acid↗
Growth, leaf morphology, water use and tissue water relations of Eucalyptus globulus clones in response to water deficit.
Changes in leaf size, specific leaf area (SLA), transpiration and tissue water relations were studied in leaves of rooted cuttings of selected clones of Eucalyptus globulus Labill. subjected to well-watered or drought conditions in a greenhouse. Significant differences between clones were found in leaf expansion and transpiration. There was a significant clone x treatment interaction on SLA. Water stress significantly reduced osmotic potential at the turgor loss point (Pi0) and at full turgor (Pi100), and significantly increased relative water content at the turgor loss point and maximum bulk elastic modulus. Differences in tissue water relations between clones were significant only in the mild drought treatment. Among clones in the drought treatments, the highest leaf expansion and the highest increase in transpiration during the experiment were measured in those clones that showed an early and large decrease in Pi0 and Pi100.
Eucalyptus↗
Water-losing and water-retaining states: role of water channels and vasopressin receptor antagonists.
Alterations in water metabolism are present in conditions such as diabetes insipidus, syndrome of inappropriate antidiuretic hormone secretion, cardiac failure, cirrhosis, and pregnancy. Recent advances in molecular biology have enhanced our understanding of disordered water metabolism in these conditions. This review examines the roles of central vasopressin synthesis and release and collecting duct vasopressin V2 receptor and aquaporin-2 water channel regulation in water-losing and water-retaining states.
Animals↗
Use of the doubly labeled water method for measurement of energy expenditure, total body water, water intake, and metabolizable energy intake in humans and small animals.
The basis of the doubly labeled water method is measurement of the differential rates of disappearance of two isotopes of water (H2 18O and either 2H2O or 3H2O, administered at the start of the study) from body water. Published studies indicate that, in its current forms, this technique can be used to provide accurate and reasonably precise information on carbon dioxide production, total body water, and water intake in free-living humans and many small animals. Total energy expenditure can be calculated from carbon dioxide production with little loss of precision. Metabolizable energy intake can also be predicted, as the sum of total energy expenditure plus an estimate for the change in body energy stores during the measurement, but this prediction is unlikely to be accurate and precise unless the subject is in approximate energy balance.
Animals↗