A Howard, E & S Dennis, E 1984, 'Transposable Elements in Maize the?Activator-Dissociation (Ac-Ds) System', Australian Journal of Biological Sciences, vol. 37, no. 6, pp. 307-307.
View/Download from: Publisher's site
View description>>
Although unstable mutants in maize (Zea mays) were described as early as 1914 (Emerson 1914, 1917, 1929; Rhoades 1936, 1938), the first explanation of such mutants in terms of transposable DNA was provided by Barbara McClintock's elegant series of experiments on the activator-dissociation (Ac-Ds) controlling-element system of maize (McClintock 1947,1948, 1951). McClintock demonstrated genetically thatAc and Ds were short regions of DNA which could move (transpose) from one chromosomal location to another. McClintock also established that Ds could transpose only in response to the action of Ac (i.e. both elements were required in the same nucleus for Ds transposition), and that Ac could transpose autonomously (i.e. in the absence of Ds). A total of eight transposable element systems have been recognized in maize, the best characterized of which are Ac(Mp)Ds, Spm and Robertson's mutator (reviewed in Fedoroff 1983; Nevers et al. 1984). All but Robertson's mutator occur as two-element systems, similar to Ac-Ds. Transposable elements have now been shown to be widespread in living organisms-occurring in prokaryotes and lower eukaryotes as well as other higher eukaryotes, including animals.
BERTRAM, CD & MILTHORPE, BK 1984, 'OPTICAL ENDPOINT SENSING IN AN AUTOMATIC WHOLE-BLOOD CLOTTING TIMER', MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING, vol. 22, no. 5, pp. 401-405.
View/Download from: Publisher's site
View description>>
Most clotting time estimations are performed manually, although attempts have been made previously to automate them. The two major methods for automatically detecting the formation of the gel-like clot are mechanical (viscometric) and optical. The latter is superior in terms of accuracy of timing and freedom from artefacts but can only be performed on blood plasma. This paper describes a device which combines centrifuging to remove red cells and optical sensing of clot formation into a single operation, therepy giving activated clotting times on a par with those obtained mechanically from whole blood. The system offers the advantage over mechanical sensing that no nondisposable parts come in contact with the blood thereby eliminating e major source of timing errors. The timer works with any liquid coagulation activator, and will also time plasma clotting. The two-chambered design of the cuvette allows the activator to be kept separate from the blood until rotor startup The start of centifugal action mixes the blood and activator and starts the time. Timing is stopped auto matically when the rate of increase of optical density in the plasma, owing to fibrin formation, reaches a predetermined fevel.
BOUX, HA, RAISON, RL, WALKER, KZ, MUSGROVE, E & BASTEN, A 1984, 'THE SURFACE EXPRESSION OF A TUMOR-ASSOCIATED ANTIGEN ON HUMAN KAPPA-MYELOMA CELLS', EUROPEAN JOURNAL OF IMMUNOLOGY, vol. 14, no. 3, pp. 216-222.
View/Download from: Publisher's site
View description>>
NA
Burchett, MD, Field, CD & Pulkownik, A 1984, 'Salinity, growth and root respiration in the grey mangrove, Avicennia marina', Physiologia Plantarum, vol. 60, no. 2, pp. 113-118.
View/Download from: Publisher's site
View description>>
Relationships between growth parameters and root respiration under various conditions of salinity were investigated in seedlings of the grey mangrove Avicennia marina (Forsk.) Vierh. Growth, root/shoot ratios, leaf succulence and osmotic potential of leaves were measured for seedlings grown for 6–8 weeks in 100, 50, 25 and 0% seawater. Oxygen uptake of root segments, from distal to proximal ends of roots, was measured for all treatments. Total growth was maximal in 25% seawater, highest leaf succulence was obtained in 50% seawater, and highest leaf osmotic potential in 100% seawater. Oxygen uptake in distal root segments, as measured both by Clark oxygen electrode and Warburg manometry, showed a stimulation in the presence of salt that closely paralleled growth stimulation. The rates of respiration were highest in 25% seawater. The oxygen uptake was not stimulated by salt per se, since concentrations higher than 25% were associated with a decline in rate of oxygen uptake from the maximum. Values for the respiratory quotient approximated to one in all treatments. Avicennia marina has been reported to exclude from its roots about 90% of the salt in the surrounding medium. It might have been expected that increased concentrations of salt in the growth medium would be associated with a standard salt respiration response in the roots; however, this was not obtained.
Carroll, RJ & Ruppert, D 1984, 'Comment', Journal of the American Statistical Association, vol. 79, no. 386, pp. 312-313.
View/Download from: Publisher's site
Carroll, RJ & Ruppert, D 1984, 'Power Transformations When Fitting Theoretical Models to Data', Journal of the American Statistical Association, vol. 79, no. 386, pp. 321-328.
View/Download from: Publisher's site
View description>>
We investigate power transformations in nonlinear regression problems when there is a physical model for the response but little understanding of the underlying error structure. In such circumstances, and unlike the ordinary power transformation model, both the response and the model must be transformed simultaneously and in the same way. We show by an asymptotic theory and a small Monte Carlo study that for estimating the model parameters there is little cost for not knowing the correct transform a priori; this is in dramatic contrast to the results for the usual case where only the response is transformed. Possible applications of the theory are illustrated by examples. © 1984 Taylor & Francis Group, LLC.
Cleland, DR, McDougald, SD & Oliver, JD 1984, 'Substrate Degradation and Pressure Tolerance of Free-Living and Attached Bacterial Populations in the Intestines of Shallow-Water Fish', Applied and Environmental Microbiology, vol. 48, no. 6, pp. 1243-1245.
View/Download from: Publisher's site
View description>>
Bacterial populations attached to intestinal linings of shallow-water fish were compared to those free in the lumen for response to hydrostatic pressure and ability to degrade a variety of substrates. Results suggested that, unlike reports on gut-associated deep-sea bacteria, the two shallow-water populations were not significantly different in their pressure or substrate responsiveness.
DENNIS, ES & PEACOCK, WJ 1984, 'KNOB HETEROCHROMATIN HOMOLOGY IN MAIZE AND ITS RELATIVES', JOURNAL OF MOLECULAR EVOLUTION, vol. 20, no. 3-4, pp. 341-350.
View/Download from: Publisher's site
DENNIS, ES, GERLACH, WL, PRYOR, AJ, BENNETZEN, JL, INGLIS, A, LLEWELLYN, D, SACHS, MM, FERL, RJ & PEACOCK, WJ 1984, 'MOLECULAR ANALYSIS OF THE ALCOHOL-DEHYDROGENASE (ADHL) GENE OF MAIZE', NUCLEIC ACIDS RESEARCH, vol. 12, no. 9, pp. 3983-4000.
View/Download from: Publisher's site
DENNIS, ES, SACHS, MM, LLEWELLYN, D, ELLIS, J, HOWARD, E, HOWELLS, S, FINNEGAN, J, GERLACH, WL & PEACOCK, WJ 1984, 'EXPRESSION OF THE MAIZE ALCOHOL-DEHYDROGENASE GENES', PROCEEDINGS OF THE AUSTRALIAN BIOCHEMICAL SOCIETY, vol. 16, pp. S32-S32.
DOOLEY, AH & GAUDRY, GI 1984, 'AN EXTENSION OF DELEEUW THEOREM TO THE N-DIMENSIONAL ROTATION GROUP', ANNALES DE L INSTITUT FOURIER, vol. 34, no. 2, pp. 111-135.
View/Download from: Publisher's site
Fandry, CB & Leslie, LM 1984, 'A Two-Layer Quasi-Geostrophic Model of Summer Trough Formation in the Australian Subtropical Easterlies', Journal of the Atmospheric Sciences, vol. 41, no. 5, pp. 807-818.
View/Download from: Publisher's site
Fandry, CB & Leslie, LM 1984, 'The effects of vertical shear and stratification on stationary rossby waves', Geophysical & Astrophysical Fluid Dynamics, vol. 29, no. 1-4, pp. 305-332.
View/Download from: Publisher's site
Fandry, CB, Leslie, LM & Steedman, RK 1984, 'Kelvin-Type Coastal Surges Generated by Tropical Cyclones', Journal of Physical Oceanography, vol. 14, no. 3, pp. 582-593.
View/Download from: Publisher's site
FONG, D, WALLACH, M, KEITHLY, J, MELERA, PW & CHANG, KP 1984, 'DIFFERENTIAL EXPRESSION OF MESSENGER-RNAS FOR ALPHA-TUBULIN AND BETA-TUBULIN DURING DIFFERENTIATION OF THE PARASITIC PROTOZOAN LEISHMANIA-MEXICANA', PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA-BIOLOGICAL SCIENCES, vol. 81, no. 18, pp. 5782-5786.
View/Download from: Publisher's site
View description>>
NA
Fong, D, Wallach, M, Keithly, J, Melera, PW & Chang, KP 1984, 'Differential expression of mRNAs for α- and β-tubulin during differentiation of the parasitic protozoan Leishmania mexicana', Proceedings of the National Academy of Sciences of the United States of America, vol. 81, no. 18 I, pp. 5782-5786.
View/Download from: Publisher's site
View description>>
The parasitic protozoan Leishmania mexicana amazonensis has two developmental stages: a motile flagellated promastigote and a sessile intracellular amastigote stage. In our previous work, cells of the promastigote stage were found to synthesize more tubulin protein than those of the amastigote stage. However, tubulin mRNAs in these leishmanias were analyzed. Based on dot blot hybridization between total leishmanial RNA and tubulin-specific cDNA probes derived from chicken brain, amastigotes and promastigotes were found to have approximately equal amounts of α-and β-tubulin mRNAs. RNA blotting of leishmanial RNA, using chicken tubulin cDNA probes, showed that amastigotes and promastigotes both gave a single mRNA species of 2100 nucleotides for α-tubulin in roughly similar quantities. However, such analysis for β-tubulin revealed mainly a single mRNA species of 3600 nucleotides for amastigotes and three species of 2800, 3600, and 4400 nucleotides for promastigotes, the smallest mRNA being the most predominant. Thus, regulation of gene expression appears to be different only for β-tubulin between the two developmental stages of this protozoan.
Gauntlett, DJ, Leslie, LM & Logan, LW 1984, 'Numerical Experiments in Mesoscale Prediction over Southeast Australia', Monthly Weather Review, vol. 112, no. 6, pp. 1170-1182.
View/Download from: Publisher's site
Huete, AR & McColl, JG 1984, 'Soil cation leaching by 'acid rain' with varying nitrate-to-sulfate ratios', Journal of Environmental Quality, vol. 13, no. 3, pp. 366-371.
View/Download from: Publisher's site
View description>>
The influence of the anion composition of simulated 'acid rain' on cation leaching of three soils with different surface-charge properties was examined. Four acid mixtures of H2SO4 and HNO3 all with pH 3.5, but with varying NO3-/SO42- mole ratios of 1.00:0.00, 0.75:0.25, 0.55:0.45, and 0.00:1.00, were used to leach an Ultic-Alfisol, an Oxisol, and an Entisol. The taxonomic names of these three soils are (1) Cornutt series: fine, mixed, mesic Ultic Haploxeralfs, (2) unnamed Rhodustox, and (3) Hanford series: coarse-loamy, mixed, nonacid, thermic Typic Xerorthents. The Alfisol had a high SO42- adsorption capacity because of its high Fe2O3 content of 12 g kg-1 and high point-of-zero charge (PZC) of 6.0. The Oxisol, although strongly weathered, had a lower Fe2O3 content of 5 g kg-1 and PZC of 4.5. The Entisol was relatively unweathered soil derived from silicaceous alluvium, with even less Fe2O3 of 3 g kg-1 and a lower PZC of 3.5, and represented a soil of fixed charge. Cation leaching of the Alfisol varied directly with the NO3- content of the leaching input due to the higher mobility of NO3- compared with SO42- that was adsorbed. The relative NO3-/SO42- contents of inputs had no effects on cation leaching of the Entisol. Effects on leaching of the Oxisol were intermediate between those of the Alfisol and Entisol. It was clearly demonstrated that the anion composition of 'acid rain' plays a significant role in the cation leaching of soils with amphoteric-charge properties, which are able to adsorb SO42-. Some practical implications are also dicussed.
Huete, AR, Post, DF & Jackson, RD 1984, 'Soil spectral effects on 4-space vegetation discrimination', Remote Sensing of Environment, vol. 15, no. 2, pp. 155-165.
View/Download from: Publisher's site
View description>>
The influence of soil background on vegetation discrimination in four-band reflectance space was examined. Dry and wet reflectance data were obtained for 20 soils covering a wide range in spectral properties with a hand-held radiometer. Principal components analysis was used to study the distribution of soil spectra in 4-space and to define a mean soil line. Soil-specific background lines were similarly derived and used to examine the overall cloud of soil spectra in individual soil form. Reflectance data from a full-canopy wheat plot were used to compute unit vector coefficients in the greenness direction from the mean soil line and from the individual soil lines. Analysis of the mean soil line showed that it was not possible to discriminate bare soil from low vegetation densities. Greenness measurements were shown to be sensitive to both soil type and soil moisture condition. In contrast, the use of individual soil lines as a base to measure greenness minimized soil background influence and improved vegetation assessment, particularly at low green plant canopy covers. © 1984.
Larkum, AWD, Collett, LC & Williams, RJ 1984, 'The standing stock, growth and shoot production of Zostera capricorni aschers. in Botany Bay, New South Wales, Australia', Aquatic Botany, vol. 19, no. 3-4, pp. 307-327.
View/Download from: Publisher's site
View description>>
Zostera capricorni Aschers. occurs at many shallow sites in Botany Bay, with the exception of one 5-km section of exposed sandy beach; however, bed distribution is very patchy. Details are given for shoot and underground biomass (g fresh weight), shoot density, leaf length and leaf width at 20 representative sites around the Bay. Z. capricorni was found to grow best between -0.2 and -1.0 m, with a lower limit between -2.0 m (northern side) and -3.2 m (southern side). The mean percentage cover was determined for six large areas in the bay. Shoot biomass (g dry weight) was found to be logarithmically related to percentage cover, whereas shoot density (numbers m-2) was linearly related to percentage cover. Large seasonal changes occurred, with a winter die-back characterised by a 4-fold reduction in shoot biomass and a 2-fold reduction in shoot numbers. Flowering occurred from September to April. An equation is presented for determining the total above-ground stock for an area. The total summer above-ground stock of the bay was estimated at 18 ± 8.1 tonnes for a total area of beds of 309 ha. Mean annual leaf production was estimated to be 5.22 ± 0.52 gDW m-2 day-1 for a representative healthy bed at 0.3 m depth, and leaf plus flower production was 5.86 ± 0.59 gDW m-2 day-1. The total above-ground production for all the beds of the bay was estimated to be 512.7 ± 51.3 tonnes year-1, i.e. 1.66 ± 0.17 tonnes ha-1 year-1. © 1984.
Leitch, EC 1984, 'Island arc elements and arc-related ophiolites', Tectonophysics, vol. 106, no. 3-4, pp. 177-203.
View/Download from: Publisher's site
View description>>
All major structural elements in island arc systems, fore-arc, magmatic arc, back-arc basins and remnant arcs, are potential ophiolite sources, and those features that allegedly characterise ophiolites of ocean-ridge origin, sheeted dyke complexes, mantling pelagic rocks, hydrothermal metamorphism and associated mineralization, can also arise within arc settings. Age relations are critical in the interpretation of arc-related ophiolites. Remnants of oceanic lithosphere, identified by a pre-arc initiation age, are restricted to fore-arc, magmatic arc and remnant arc elements, as are ophiolite masses generated at the inception of underthrusting. The latter, apparently common in ancient fore-arc terrains, form in nascent arc systems in which the rate of role back of the subduction hinge exceeds the rate of convergence. Spreading occurs above a foundering slab resulting in some arc-like compositional features. In simple arc systems later ophiolitic rocks have formed either in the active back-arc basin or the magmatic arc. Only those ophiolites that have resided within or very close behind magmatic arcs should show calcalkaline or arc tholeiite magmatic affinities, or be intruded or overlain by these rocks. Volcanic-derived sediment or pelagic material may mantle ophiolites from all arc settings, but pelagic rocks will generally dominate in stratigraphic sequences above remnant arcs and on back-arc basin floors except adjacent to the magmatic arc. Ophiolites generated at major ocean ridges are unlikely to be immediately overlain by sediment with a significant volcanic component whereas such detritus may lie directly on arc-inception, arc and back-arc ophiolites. Some arc-derived ophiolites are preserved in their original tectonic position, others can be identified from their internal features, their relationship to other tectonic elements, and the nature of associated rocks. © 1984.
Leitch, EC 1984, 'Marginal basins of the SW Pacific and the preservation and recognition of their ancient analogues: a review.', Marginal basin geology, pp. 97-108.
View description>>
Similarities are recognized between the present-day SW Pacific and the formative stage of the N American Cordillera. The Late Mesozoic palaeogeography of the W Alps resembles the complex of small ocean basins and continental fragments W of the Norfolk Ridge, and the Ordovician palaeogeography of central Newfoundland bears close resemblance to the assemblage of back-arc basins, remnant arcs and active arc E from the Norfolk Basin.-from Author
LIM, RP, ABDULLAH, MF & FERNANDO, CH 1984, 'ECOLOGICAL-STUDIES OF CLADOCERA IN THE RICEFIELDS OF TANJUNG KARANG, MALAYSIA, SUBJECTED TO PESTICIDE TREATMENT', HYDROBIOLOGIA, vol. 113, no. JUN, pp. 99-103.
View/Download from: Publisher's site
View description>>
NA
MCPHEDRAN, RC, BOTTEN, LC, MCKENZIE, DR & NETTERFIELD, RP 1984, 'UNAMBIGUOUS DETERMINATION OF OPTICAL-CONSTANTS OF ABSORBING FILMS BY REFLECTANCE AND TRANSMITTANCE MEASUREMENTS', APPLIED OPTICS, vol. 23, no. 8, pp. 1197-1205.
View/Download from: Publisher's site
View description>>
NA
Miller, AJ & Leslie, LM 1984, 'Short-Term Single-Station Forecasting of Precipitation', Monthly Weather Review, vol. 112, no. 6, pp. 1198-1205.
View/Download from: Publisher's site
Miller, TE, Soho Wing, J & Huete, AR 1984, 'The agricultural potential of selected C4 plants in arid environments.', Journal of Arid Environments, vol. 7, no. 3, pp. 275-286.
View description>>
Germination responses of Amaranthus hypochondriacus, A. retroflexus and Portulaca oleracea to both temperature and moisture were determined in growth chambers and contrasted with the response of 2 C3 species, Beta vulgaris var. cicla and Chenopodium album. The C4 species had higher germination percentages over the entire range of temperatures studied. Differences in photosynthetic pathway had no effect on moisture requirements for germination. Dry weight yields increased linearly with soil moisture for both the C4 and the C3 species, but the water-use efficiencies of the C4 species were higher at all watering levels investigated. The photosynthetic pathway of each species had no apparent effect on its productivity in relation to soil salinity. The nutritional standing qualities except for consistently high lysine contents. No advantage was found for C4 plants grown in saline soil. -from Authors
MILLER, TE, WING, JS & HUETE, AR 1984, 'THE AGRICULTURAL POTENTIAL OF SELECTED C-4 PLANTS IN ARID ENVIRONMENTS', JOURNAL OF ARID ENVIRONMENTS, vol. 7, no. 3, pp. 275-286.
MOON, AR & PHILLIPS, MR 1984, 'AN ELECTRON-MICROSCOPY STUDY OF EXSOLVED PHASES IN NATURAL BLACK AUSTRALIAN SAPPHIRE', MICRON AND MICROSCOPICA ACTA, vol. 15, no. 3, pp. 143-146.
View/Download from: Publisher's site
View description>>
NA
Moon, AR & Phillips, MR 1984, 'The physics of asterism in sapphire.', Schweizerische Mineralogische und Petrographische Mitteilungen, vol. 64, no. 3, pp. 329-334.
View description>>
The star image in silky sapphire (asterism) is shown to result from the incoherent superposition of reflected Fraunhofer diffraction patterns. These arise when light is scattered from precipitates strictly oriented within the sapphire host. The theory explains why long, thin precipitates produce sharper stars than their shorter and wider counterparts and why a cabochon is normally required to observe the star image. -W.S.
Novikov, AA 1984, 'Martingale identities and inequalities and their applications in nonlinear boundary-value problems for random processes', Mathematical Notes of the Academy of Sciences of the USSR, vol. 35, no. 3, pp. 241-249.
View/Download from: Publisher's site
PEACOCK, WJ, DENNIS, ES, GERLACH, WL, SACHS, MM & SCHWARTZ, D 1984, 'INSERTION AND EXCISION OF DS CONTROLLING ELEMENTS IN MAIZE', COLD SPRING HARBOR SYMPOSIA ON QUANTITATIVE BIOLOGY, vol. 49, pp. 347-354.
View/Download from: Publisher's site
RAISON, RL & HILDEMANN, WH 1984, 'IMMUNOGLOBULIN BEARING BLOOD LEUKOCYTES IN THE PACIFIC HAGFISH', DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY, vol. 8, no. 1, pp. 99-108.
View/Download from: Publisher's site
View description>>
NA
Raison, RL, Walker, K, Hayden, G & Goodnow, C 1984, 'Tumor Recognition And Targeting With Monoclonal-antibodies', Proceedings Of The Australian Biochemical Society, vol. 16, pp. 1-1.
View description>>
NA
REIMERS, JR & WATTS, RO 1984, 'A LOCAL MODE POTENTIAL FUNCTION FOR THE WATER MOLECULE', MOLECULAR PHYSICS, vol. 52, no. 2, pp. 357-381.
View/Download from: Publisher's site
Reimers, JR & Watts, RO 1984, 'The structure and vibrational spectra of small clusters of water molecules', Chemical Physics, vol. 85, no. 1, pp. 83-112.
View/Download from: Publisher's site
View description>>
A potential surface for deformable water molecules is constructed using an accurate local-mode intramolecular model together with a realistic semi-empirical intermolecular interaction. Locally stable structures for (H2O)n, n = 2, 3 and 4, are reported and their vibrational frequencies calculated using both normal-mode analysis with variational corrections for anharmonicities, and local-mode analysis. It is shown that experimentally observed changes in vibrational frequencies on cluster formation arise from anharmonic terms in the monomer potential that become significant due to distortions to the equilibrium geometry. Inhomogeneous line shapes are calculated using rigid-rotor theory, linear response theory, non-equilibrium molecular dynamics and a semi-classical method based on classical Monte Carlo trajectory propagation and local-mode spectral analysis. The last method gives a satisfactory description of the density of states in the intramolecular vibrational region of the spectrum. Dipole moment functions including polarisation give infrared intensities in good agreement with available experimental data. © 1984 Elsevier Science Publishers B.V.
REIMERS, JR & WATTS, RO 1984, 'THE STRUCTURE AND VIBRATIONAL-SPECTRA OF SMALL CLUSTERS OF WATER-MOLECULES', CHEMICAL PHYSICS, vol. 85, no. 1, pp. 83-112.
View/Download from: Publisher's site
REIMERS, JR & WATTS, RO 1984, 'THE STRUCTURE, THERMODYNAMIC PROPERTIES AND INFRARED-SPECTRA OF LIQUID WATER AND ICE', CHEMICAL PHYSICS, vol. 91, no. 2, pp. 201-223.
View/Download from: Publisher's site
RITCHIE, RJ & LARKUM, AWD 1984, 'CHLORIDE TRANSPORT IN ENTEROMORPHA INTESTINALIS (L.) LINK', New Phytologist, vol. 97, no. 3, pp. 319-345.
View/Download from: Publisher's site
View description>>
SummaryRates of 36Cl− labelling, efflux and uptake were measured on Enteromorpha plants grown in sea‐water (547 mM Cl−), and also in brackish water medium [Artificial Cape Banks Spring Water (ACBSW), 25.5 mM Cl−, 20.4 mM Na+ and 0.5 mM K+]. Efflux experiments showed that, in Enteromorpha plants grown in seawater, light did not affect Cl− fluxes at the plasmalemma and tonoplast. Typical experiments exhibited two exchanged phases but a significant number (8/32) exhibited a single exchange phase; this was more likely to occur in darkness. Influx experiments also showed no effect of light on the tonoplast flux. Transfer of plants grown and labelled in seawater to low salinity medium caused a rapid loss of 36C1− label; however, this was related to the change in osmotic potential of the medium rather than to changes in [Cl−o] or [K+0]. Exchange of 36Cl− did not depend on [K+o] in seawater. Cyanide decreased 36Cl− uptake in the dark but not in the light. In low salinity medium (ACBSW), 36Cl− labelling and the plasmalemma flux in Enteromorpha plants were independent of light; however, the intracellular compartmentation of Cl− differed between light and dark. The tonoplast flux was also greater in the light. Intracellular Cl− was about 300 mmol kg−1 in seawater plants and about 159 mmolkg−1 in ACBSW plants. The cytoplasmic Cl−...
RITCHIE, RJ & LARKUM, AWD 1984, 'SODIUM TRANSPORT IN ENTEROMORPHA INTESTINALIS (L.) LINK', New Phytologist, vol. 97, no. 3, pp. 347-362.
View/Download from: Publisher's site
View description>>
SummarySodium transport was studied in the marine euryhaline alga, Enteromorpha intestinalis in seawater (465 mM Na+ and in low salinity medium [Artificial Cape Banks Spring Water (ACBSW), 25.5 mM Cr, 20.4 mM Na+, 0.5 mM K+]. The intracellular Na+ concentration ([Na+1]) of E. intestinalis was so low that it was difficult to detect using chemical and 22Na+ methods. Consequently, intracellular Na+ fluxes were also difficult to measure. Most of the Na+of the Enteromorpha tissue was bound to the fixed negative charges of the cell wall and this binding has, in previous studies, led to great overestimates of the intracellular Na+ of this plant‐Data of 22Na+ labelling gave lower estimates of the Na+1] than a rinsing technique using isotonic Ca(NO3)2. The overall mean [Na+1] of seawater plants was only 5.5 ± 1.4 mM, with a value of 0.623 ± 0.163 mM Na+ in ACBSW plants. With one exception, all the seawater 22Na+ experiments indicated a single intracellular exchange phase, i.e. a separate vacuolar phase could not be detected. The data on plants grown at low salinity could be interpreted as having either a single intracellular phase or two intracellular phases because of the problem of cell wall Na+ exchange. No significant difference was found in total 22Na+ uptake or exchange fluxes in the light and dark in seawater‐grown plan...
Ruppert, D, Reish, RL, Deriso, RB & Carroll, RJ 1984, 'Optimization Using Stochastic Approximation and Monte Carlo Simulation (with Application to Harvesting of Atlantic Menhaden)', Biometrics, vol. 40, no. 2, pp. 535-535.
View/Download from: Publisher's site
SMITH, GB & MCKENZIE, DR 1984, 'DC MAGNETRON GLOW-DISCHARGE AMORPHOUS-SILICON', SOLAR ENERGY MATERIALS, vol. 11, no. 1-2, pp. 45-56.
View/Download from: Publisher's site
View description>>
NA
SMITH, GB & TEYTZ, K 1984, 'AN IMMERSION COATED MOLYBDENUM BASED SELECTIVE ABSORBER', SOLAR ENERGY MATERIALS, vol. 9, no. 4, pp. 449-458.
View/Download from: Publisher's site
View description>>
NA
Tyerman, SD, Hatcher, AI, West, RJ & Larkum, AWD 1984, 'Posidonia australis Growing in Altered Salinities: Leaf Growth, Regulation of Turgor and the Development of Osmotic Gradients', Functional Plant Biology, vol. 11, no. 2, pp. 35-35.
View/Download from: Publisher's site
View description>>
The marine angiosperm Posidonia australis Hook f. is always submerged and the leaf cells are able to exchange ions, gases and water with the surrounding seawater. The base of the youngest lamina is surrounded by sheaths from older leaves and a gradient in cell osmotic pressure existed from the base of the lamina enclosed within the sheath to the emerged zone at the top of the sheath. For plants grown in seawater, the cells at the base of the lamina had an osmotic pressure of 1.34 MPa (seawater = 2.54 MPa); the osmotic pressure increased with distance along the lamina to the emerged lamina value of 3.09 MPa. The osmotic gradient was accounted for by cell concentration gradients of Na+ (73 mol m-3 increasing to 412 mol m-3), K+ (91 mol m-3 increasing to 279 mol m-3) and Cl- (62 mol m-3 increasing to 578 mol m-3). Gradients also existed in the cell concentrations of sucrose and amino acids. It is proposed that, within the solution enclosed by the sheath, a standing osmotic gradient is created by ion uptake from the sheath solution.
Leaf growth was unaffected by salinities from 13‰ to 57‰ and net photosynthesis was unaffected by reduction in salinity from 34‰ to 19‰. The cells of the leaves and rhizome adjusted their osmotic pressure by changes in Na+, K+ and Cl- concentrations such that turgor varied only between 0.67 and 1.52 MPa over a range in external osmotic pressures from 0.83 to 3.89 MPa. The tolerance of P. australis to changes in salinity in the absence of severe physical disturbance is due, largely, to the sheath and to the osmotic pressure gradient.
WALLACH, M, CULLY, DF, HAAS, LOC, TRAGER, W & CROSS, GAM 1984, 'HISTIDINE-RICH PROTEIN GENES AND THEIR TRANSCRIPTS IN PLASMODIUM-FALCIPARUM AND P-LOPHURAE', MOLECULAR AND BIOCHEMICAL PARASITOLOGY, vol. 12, no. 1, pp. 85-94.
View/Download from: Publisher's site
View description>>
NA
