Pressure bomb

SciVee ◽  
2009 ◽  
Author(s):  
Burkhard Schulz ◽  
Diana Nucera
Keyword(s):  
Pressure Bomb

The atomic-absorption spectrophotometric determination of total aluminium in steel after its dissolution in a pressure bomb

The Analyst ◽  
1973 ◽  
Vol 98 (1162) ◽  
pp. 57 ◽  
Author(s):  
J. B. Headridge ◽  
Alan Sowerbutts
Keyword(s):  
Atomic Absorption ◽  
Spectrophotometric Determination ◽  
Pressure Bomb

Comparative measurements of the xylem pressure ofNicotiana plants by means of the pressure bomb and pressure probe

Planta ◽  
1990 ◽  
Vol 182 (3) ◽  
pp. 325-338 ◽  
Author(s):  
Angelika Balling ◽  
Ulrich Zimmermann
Keyword(s):  
Pressure Probe ◽  
Xylem Pressure ◽  
Pressure Bomb

scholarly journals Ultrasonic Acoustic Emissions from the Sapwood of Thuja occidentalis Measured inside a Pressure Bomb

1984 ◽  
Vol 74 (4) ◽  
pp. 1046-1049 ◽  
Author(s):  
Melvin T. Tyree ◽  
Michael A. Dixon ◽  
Robert G. Thompson
Keyword(s):  
Acoustic Emissions ◽  
Thuja Occidentalis ◽  
Pressure Bomb

Comparative monitoring of temporal and spatial changes in tree water status using the non-invasive leaf patch clamp pressure probe and the pressure bomb

2010 ◽  
Vol 98 (2) ◽  
pp. 283-290 ◽  
Author(s):  
S. Rüger ◽  
W. Ehrenberger ◽  
M. Arend ◽  
P. Geßner ◽  
G. Zimmermann ◽  
...  
Keyword(s):  
Patch Clamp ◽  
Water Status ◽  
Pressure Probe ◽  
Non Invasive ◽  
Spatial Changes ◽  
Pressure Bomb ◽  
Temporal And Spatial

A comparison of systematic errors between the Richards and Hammel methods of measuring tissue – water relations parameters

1978 ◽  
Vol 56 (17) ◽  
pp. 2153-2161 ◽  
Author(s):  
M. T. Tyree ◽  
M. E. MacGregor ◽  
A. Petrov ◽  
M. I. Upenieks
Keyword(s):  
Cell Wall ◽  
Osmotic Pressure ◽  
Water Relations ◽  
Turgor Pressure ◽  
Systematic Errors ◽  
Tissue Water ◽  
Cell Wall Elasticity ◽  
Pressure Bomb ◽  
Bomb Method

The pressure bomb is being used to a much greater extent to measure some tissue – water relations parameters such as osmotic pressure, turgor pressure, and cell wall elasticity. Recently, Richards has developed a faster pressure-bomb method of obtaining these and other parameters than the method used by Hammel and modified by us. In this paper, we compare the two methods and conclude that Richards’ method should not be used when accuracy is deemed important. The Richards method usually overestimates osmotic pressure by 0.2 MPa (= 2 bars) and sometimes by 0.8 MPa (= 8 bars).

Electrical resistance measurements of water potential in avocado and white spruce

1978 ◽  
Vol 8 (1) ◽  
pp. 73-80 ◽  
Author(s):  
M. A. Dixon ◽  
R. G. Thompson ◽  
D. S. Fensom
Keyword(s):  
Water Potential ◽  
Linear Correlation ◽  
Electrical Resistance ◽  
Measurement Techniques ◽  
White Spruce ◽  
Nondestructive Method ◽  
Fixed Position ◽  
Thermocouple Psychrometer ◽  
Daily Cycles ◽  
Pressure Bomb

Simultaneous measurements of electrical resistance (or impedance (Z)) and water potential have been made on avocado Perseaamericana Mill. in the laboratory and on white spruce Piceaglauca (Moench) Voss in the field.A significant correlation was found between electrical impedance (corrected to standard temperature of 20 °C) and water potential of nearby leaves as measured by either pressure bomb or thermocouple psychrometer. When the resistance measurements were expressed as a percent of the measured maximum resistance reading the correlation with water potential was very nearly linear (correlation coefficient: Perseaamericana Mill., 0.98; Piceaglauca (Moench) Voss, 0.94). This relationship also seems to hold in Helianthusannuus L.The application of electrical resistance measurement techniques to these two plant systems has been shown to be a simple, nondestructive method of monitoring the water potential of such systems. The linear correlation between water potential and electrical resistance held whether the technique was applied on a tree at a fixed position through daily cycles, at different positions vertically up a tree, or under various degrees of hydration in a pressure bomb.

scholarly journals ABA AS A ROOT SIGNAL IN GRAPEVINES UNDER WATER STRESS

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 612g-613
Author(s):  
E. Peterlunger ◽  
B. Marangoni
Keyword(s):  
Water Stress ◽  
Xylem Sap ◽  
Root Hydraulic Conductivity ◽  
Grapevine Cultivar ◽  
Root Signals ◽  
Pressure Bomb ◽  
Root Signal ◽  
Immuno Assay ◽  
One Year ◽  
Wilting Point

ABA implication in root signals of water stress has been suggested by several authors. To verify this hypothesis in grapevines, this experiment has been carried out. One-year-old own rooted cuttings of grapevine cultivar Cabernet Sauvignon were exposed to water stress. After three months of growth, water was completely withdrawn for nine days, till the plants reached the wilting point. The plants were then rewatered. During the whole period, root hydraulic conductivity was measured with a pressure bomb; xylem sap samples were collected, as well as leaf and root samples. ABA concentration in these samples was measured using Radio Immuno Assay with DBPA1, a monoclonal antibody for ABA. The concentration of xylem sap ABA was 68.2 mg m-3 at the start of the experiment. After eight days of stress it was 1863.6 mg m-3, 27 × higher. On the ninth day the plants were rewatered, and the xylem sap ABA decreased at 100.2 mg m-3, keeping this level for eight more days. Leaf ABA showed high levels of this inhibitor, with a peak in correspondence with the maximum stress. A similar behaviour was attained by roots. In grapevine, ABA seems to be involved in a water stress root signal directed to the canopy.

scholarly journals THE DYNAMICS OF HYDRAULIC LIFT IN PEACH TREE

HortScience ◽  
1995 ◽  
Vol 30 (2) ◽  
pp. 187b-187
Author(s):  
David M. Modise ◽  
Michael D. Glenn ◽  
Morris Ingle
Keyword(s):  
Prunus Persica ◽  
Root Zone ◽  
Bare Soil ◽  
Hydraulic Lift ◽  
Split Root ◽  
Split Root System ◽  
Pressure Bomb ◽  
Dry Soil ◽  
Water Potential Measurements ◽  
Peach Trees

The split root technique was used to study water afflux in peach [Prunus persica (L.) Batsch] from wet to dry soil through root systems that bridge wet and dry soil. Peach trees conduct hydraulic lift (HL) to ameliorate water deficits in dry soil layers, under conditions of low transpirational demand. The objectives of this study were to examine the magnitude of HL in peach and to determine its effect on nutrient uptake from dry soil. In addition, the split root system was used to measure peach water uptake from soil supporting `Kentucky 31' tall fescue [Festuca arundinaceae (Schreb)] and determine the diurnal partitioning of water use from covered and bare soil treatments. A Scholander pressure bomb was used to record hourly measurements of water potentials (10 am to 4 p m), daily for a total of 14 days in 3 replicates (1 tree/rep.). Leaf stomata1 resistance was measured using a porometer, simultaneously with the water potential measurements. The CR 7 datalogger was used to record water transfer into the dry root section. 15N was applied in the 15-30 cm root zone, and the concentration in the leaves was determined using a mass spectrometer. Results obtained will be discussed in relation to objectives stated above.

scholarly journals Effect on the Measurement of Trace Element by Pressure Bomb and Conventional Teflon Vial Methods in the Digestion Technique

2016 ◽  
Vol 25 (2) ◽  
pp. 107-119 ◽  
Author(s):  
Seung-Gu Lee ◽  
Taehoon Kim ◽  
Tsuyoshi Tanaka ◽  
Seung Ryeol Lee ◽  
Jong Ik Lee
Keyword(s):  
Trace Element ◽  
Digestion Technique ◽  
Pressure Bomb

A Comparison of Methods for Platelet Lysis and the Isolation of Platelet Membranes

1971 ◽  
Vol 26 (01) ◽  
pp. 038-057 ◽  
Author(s):  
A. J Barber ◽  
D. S Pepper ◽  
G. A Jamieson
Keyword(s):  
Zinc Chloride ◽  
Mercuric Acetate ◽  
Membrane Structures ◽  
Membrane Stabilization ◽  
Stabilizing Agents ◽  
Ultrastructural Studies ◽  
Osmotic Lysis ◽  
Pressure Bomb ◽  
Chloride Method ◽  
Degree Of Fragmentation

SummaryFour methods of platelet lysis, namely, sonication, nitrogen cavitation in a high pressure bomb, the use of a “no clearance” tissue homogenizer and simple osmotic lysis have been compared in terms of ease, effectiveness and reproducibility in comparison with a method involving the hypotonic lysis of glycerol-loaded platelets ; the most extensive studies have been carried out using sonication and the tissue homogenizer. In order to reduce the degree of fragmentation of the platelet membrane, the use of surface stabilizing agents such as zinc chloride and fluorescein mercuric acetate have also been investigated. Membranes obtained in these different ways have been isolated by centrifugation on continuous or discontinuous sucrose density gradients and the resulting fractions compared by electron microscopy, enzymatic activity, chemical analysis and hemagglutination inhibition. The glycerol-lysis technique was found to be most effective (85%) in untreated platelets and the degree of lysis was considerably reduced in platelets hardened by the zinc chloride method. Ultrastructural studies showed that the largest membrane fragments (175 nm) were obtained by glycerol lysis of untreated platelets and that smaller vesicles (50-100 nm) were obtained by the other techniques even following membrane stabilization. Double membrane structures were obtained in several of these methods.

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