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  • 1
    Digitale Medien
    Digitale Medien
    Is .gamma.-chymotrypsin a tetrapeptide acyl-enzyme adduct of .alpha.-chymotrypsin? (1989)
    s.l. : American Chemical Society
    Biochemistry 28 (1989), S. 7033-7038 
    Details
    ISSN: 1520-4995
    Quelle: ACS Legacy Archives
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/bi00443a038
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Calculation of the elementary graph of the fourth virial coefficient of a dilute ionic solution (1975)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 79 (1975), S. 1820-1821 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100584a013
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  • 3
    Digitale Medien
    Digitale Medien
    The Sea-Defence Value of Salt Marshes: Field Evidence From North Norfolk (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 15 (2001), S. 0 
    Details
    ISSN: 1747-6593
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Energietechnik
    Notizen: Approaches to coastal management have focused increasingly on ‘soft’engineering methods such as beach/foreshore recharge or the managed realignment of coastal defences. In this context, the creation/maintenance of salt marshes is often seen as being of ecological and flood-defence importance. However, until recently, no field data of wave attenuation over Northern European salt marshes had been available; therefore the debate on the sea-defence value of salt marshes has remained highly speculative. This paper (a) reviews results from a field and numerical modelling study at Stiffkey, north Norfolk, (b) presents a scientifically based argument for the evaluation of salt marshes as part of sea-defence schemes, and (c) discusses the relationship between hydrodynamic parameters, salt-marsh surface characteristics, and possible management implications and engineering guidelines.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1747-6593.2001.tb00315.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Biological Oxidations and Reductions (1939)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biochemistry 8 (1939), S. 1-36 
    Details
    ISSN: 0066-4154
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Chemie und Pharmazie , Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.bi.08.070139.000245
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  • 5
    Digitale Medien
    Digitale Medien
    Boundary layer conductance of the leaves of some tropical timber trees (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 3 (1980), S. 0 
    Details
    ISSN: 1365-3040
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Abstract The boundary layer conductance of brass models of leaves exposed in a wind tunnel was determined from their cooling characteristics. Conductances were generally very low, as expected from large leaves. Nusselt numbers were calculated from the rates of heat loss, so that the results could be compared with established theory. There was generally good agreement between observed and calculated values. Leaves with veins displayed an apparent transition from a laminar to a turbulent boundary layer, and so did leaves inclined at an angle from the horizontal. In still air the observed rates of heat loss by natural convection were substantially higher than those calculated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/1365-3040.ep11586917
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  • 6
    Digitale Medien
    Digitale Medien
    Water uptake by some chamber materials (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 5 (1982), S. 0 
    Details
    ISSN: 1365-3040
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Abstract. The characteristics of water uptake by several materials have been studied. Nitrile rubber, silicone rubber and perspex retained substantial quantities of water. Metals took up smaller, but still significant, amounts of water, and glass was the least water-retentive material used in the tests. The surface structure of the material, revealed by scanning electron microscopy, does not necessarily account for its water uptake characteristics. The results are discussed in relation to the design and construction of psychrometer and porometer chambers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/1365-3040.ep11573144
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  • 7
    Digitale Medien
    Digitale Medien
    Water relations of the tomato during fruit growth (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 15 (1992), S. 0 
    Details
    ISSN: 1365-3040
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Fruit and stem water potentials of tomato plants were measured continuously for several days using automated psychrometers. A linear voltage displacement transducer was used to simultaneously measure diameter changes on an adjacent fruit. A strong correlation was observed between the water potential gradient of the fruit and stem, and changes in fruit diameter. Fruit diameter increased when the apoplasmic water potential gradient favoured solution flow into the fruit and fruit shrinkage occurred only when the water potential gradient was inverted. Based on our data and other published data (Ehret & Ho 1986; Lee 1989a) on phloem transport in tomato, we have concluded that low stem water potentials have an immediate and direct effect on phloem turgor; reducing the driving force for sap flow into the fruit. Since fruit water potential remained relatively constant, the diurnal variation in stem water potential was sufficient to account for the correlation with changes in fruit diameter. There are consequences with respect to predicting the accumulation of dry matter in tomato fruit.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3040.1992.tb01027.x
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  • 8
    Digitale Medien
    Digitale Medien
    Concurrent measurements of stem density, leaf and stem water potential, stomatal conductance and cavitation on a spaling of Thuja occidentalis L. (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 7 (1984), S. 0 
    Details
    ISSN: 1365-3040
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Abstract Concurrent estimates of stem density, leaf and stem water potential, stomatal conductance and ultrasonic acoustic emissions (cavitations) in an excised sapling of Thuja occidentalis L. were made. As the sapling dehydrated in air, the decline in leaf water potential to about - 2.0 MPa was followed by apparent rehydration of the foliage while the stem showed no sign of rehydration. The rate of acoustic emissions peaked prior to the onset of rehydration which coincided with virtual stomatal closure. There was a significant decline in stem density until maximum foliage rehydration level was reached. From this point, leaf water potential, stem water potential and stem density continued a relatively slow decline while acoustic emission rate and stomatal conductance remained low.Removal of the bark and majority of foliage from the sapling resulted in increased cavitation and more rapid deelines in leaf and stem water potential and stem density.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/1365-3040.ep11592146
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  • 9
    Digitale Medien
    Digitale Medien
    A new stem hygrometer, corrected for temperature gradients and calibrated against the pressure bomb (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 7 (1984), S. 0 
    Details
    ISSN: 1365-3040
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Abstract A simple stem hygrometer for attachment to a bared section of sapwood or a cross-sectional cut end of a shoot is described. Two welded chromelconstantan thermocouples inside the chamber, one touching the sample and the other in the chamber air, allowed measurement of and correction for the temperature gradient between the sample and the dewpoint measuring junction. The instrument was attached to the cut end of an apical shoot of Thuja occidentalis L. protuding from a Scholander-Hammel pressure bomb. Cut-end water potential (ψhyg), measured using the stem hygrometer, was compared to xylem pressure potential (ψxp) while the latter was manipulated in the pressure bomb. After an initial equilibration time of 3–4 h, hygrometer equilibrium values were achieved within 1.5–4.0 min of changing ψxp in the pressure bomb. The half-time (ψ1/2) for vapour pressure equilibration was 15–40 s. Stable temperature gradients between the sample and dewpoint measuring junction of 0.01–0.1°C were measured. Correcting ψhyg for the temperature gradient resulted in excellent agreement with ψxp.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/1365-3040.ep11572454
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  • 10
    Digitale Medien
    Digitale Medien
    Field measurement of leaf water potential with a temperature-corrected in situ thermocouple psychrometer (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 11 (1988), S. 0 
    Details
    ISSN: 1365-3040
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Abstract. The construction and evaluation of a temperature-corrected in situ thermocouple psychrometer for measurement of leaf water potential (Ψ) is described. The instrument utilized two chromel-constantan thermocouples which allowed for detection of both the psychrometric zero offset and the temperature differential between the sample and the Peltier measuring junction. The psychrometer was subjected to stable temperature gradients while in contact with reference solutions of sodium chloride, and the effects of thermal gradients were quantified. Regression analysis indicated that temperature differentials were responsible for errors in water potential determinations of approximately –7.73 MPa°C−1. When installed on leaves of field-grown cotton (Gossypium hirsutum L.), corn (Zea mays L.) and soybean (Glycine max L. Merr) the instrument detected temperature differentials up to 0.1°C (–6.0 μV) which were associated with relatively small shifts in psychrometric zero offsets (–0.05––0.75 μV). Results indicated that substantial errors in apparent Ψ were caused by non-isothermal conditions between the leaf and the psychrometer measuring junction. The relative magnitude of these errors could be quantified and the corrected results showed good agreement with conventional psychrometric determination of Ψ on excised samples during a diurnal cycle.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3040.1988.tb01137.x
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