ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Electronic Resource

Effects of low water potential on ion uptake and loss for excised roots (1968)

Greenway, H. ; Klepper, Betty ; Hughes, P. G.

Springer

Planta 80 (1968), S. 129-141

add to mindlist on the mindlist

Details

ISSN: 1432-2048

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary In excised roots of barley and tomato plants, lowering the water potential of nutrient solutions to-10.4 and-20.4 atm decreased the uptake of bromide and phosphorus while increasing the loss of these ions to the external solutions. Lowering the water potential greatly increased the rate of loss of potassium and bromide from the cytoplasm, but the increases in loss from the vacuoles were much smaller. The results suggest that the mechanisms of ion uptake are not affected by low water potential and that the decrease in ion accumulation is caused by the increased leakage from the cells.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00385588

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

2

Electronic Resource

The importance of cell size in influencing the texture of the cooked potato. I. Preliminary observations (1968)

Linehan, D. J. ; Stooke, C. E. ; Hughes, J. C.

Springer

Potato research 11 (1968), S. 221-225

add to mindlist on the mindlist

Details

ISSN: 1871-4528

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Description / Table of Contents: Zusammenfassung die Beziehung zwischen Zellgrösse und interzellularer Adhäsion wurde an Mustern von acht Sorten (Avenir, Gladstone, King Edward, Majestic, Maris Piper, Orion, Record undRedskin) untersucht, die in Töpfen in zwei Nährlösungen herangezogen wurden. Die gleichen Sorten wurden auch im Feld zusammen mit neun andern Sorten (Arran Pilot, Arran Victory, Dr McIntosh, Dumbar Standard, Golden Wonder, Pentland Crown, Pentland Dell, Ulster Glade undUlster Supreme) angebaut und untersucht. Die interzellulare Adhäsion wurde durch Messungen der Druckfestigkeit mittels des Wolodkewitsch Tenderometers bestimmt. Die Zellgrösse wurde anhand von schwach vergrösserten Mikrophotographien gemessen. Zwischen der interzellularen interzellularen Adhäsion und der gesamten Oberfläche der Zellen in 1 mm3 des Knollengewebes wurde ein direkter Zusammenhang festgestellt (Abb. 1). Der Korrelationskoeffizient für diese zwei Faktoren war 0,63 was beiP-0,001 signifikant ist. Schwankungen in der Zellgrösse können nur zum Teil für die unterschiedlich interzellulare Adhäsion verantwortlich gemacht werden. Es wird angenommen, dass dies auf den Einfluss von Polyuronid, Calzium und Stärke zurückzuführen ist. Der Einfluss von Interaktionen zwischen Zell grösse und diesen Bestandteilen auf die interzellulare Adhäsion wird untersucht.

Abstract: Résumé Les auteurs ont recherché la relation entre la grandeur des cellules et l'ahérence intercellulaire sur des échantillons de huit variétés (Avenir, Gladstone, King Edward, Majestic, Maris Piper, Orion, Record etRedskin) développées dans deux solutions nutritives différentes, ainsi que dans les mêmes variétés développées au champ; l'examen de la dite relation a également porté sur des échantillons de neuf autres variétés développées au champ (Arran Pilot, Arran Victory, Dr McIntosh, Dunbar Standard, Golden Wonder, Pentland Crown, Pentland Dell, Ulster Glade etUlster Supreme). L'adhérence intercellualaire est déterminée en mesurant la résistance à la compression au moyen du tendromètre Wolodkewitsch. La grandeur des cellules est déterminée par microphotographie de faible grossissement. Les auteurs ont trouvé une relation directe entre l'adhérence intercellulaire et la surface totale des cellules présentes dans 1 mm3 de tubercule (Fig. 1). Le coëfficient de corrélation entre ces deux facteurs est de 0,63 et est significatif au seulP=0,001. Les variations dans la grandeur des cellules ne jouent qu'un rôle partiel dans la variation de l'adhérence intercellulaire. Il est supposé que ceci peut-être dû à l'efet des polyuronide, calcium et amylose. Une-recherche est en cours sur l'effet des interactions entre la grandeur des cellules et leurs constituants sur l'adhérence intercellulaire.

Notes: Summary The relationship between intercellular adhesion and the total surface area of cells per unit volume of tuber was investigated with samples from seventeen varieties grown in the field and eight varieties grown in pots. A direct relationship was found with a correlation coefficient of 0.63 (significant atP=0.001).

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02407546

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

3

Electronic Resource

Effect of microstructure on superconducting properties of Mo/34 at.% Re alloy (1968)

Witcomb, M. J. ; Echarri, A. ; Narlikar, A. V. ; [et al.]

Springer

Journal of materials science 3 (1968), S. 191-205

add to mindlist on the mindlist

Details

ISSN: 1573-4803

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract The effect of deformation and heat-treatments on magnetisation of superconducting Mo/34 at.% Re alloy was investigated. The microstructure was studied using optical and electron microscopy. The values of the parameterκ of the GLAG theory were determined by using three different methods, and they are found to be in accordance with some of the predictions of the Maki theory. The results show that in deformed specimens the magnetic hysteresis is mainly due to the interaction of Abrikosov supercurrent vortices with dislocation tangles; both twin boundaries and grain boundaries are relatively ineffective in causing flux hindrance. The hysteresis observed after annealing has been explained in terms of the occurrence of dislocation rearrangement and the precipitation of the sigma phase. Flux-pinning by dislocation tangles has been treated as a special case of pinning by normal particles and a magnitude of the resulting pinning force is obtained. The experimental results are compared with the predictions of a theoretical model of flux-pinning.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00585488

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

4

Electronic Resource

Automation of data collection and analysis in lung scanning with radioactive gases (1968)

Kingaby, G. P. ; Glazier, J. B. ; Hughes, J. M. B. ; [et al.]

Springer

Medical & biological engineering & computing 6 (1968), S. 403-408

add to mindlist on the mindlist

Details

ISSN: 1741-0444

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Chemistry and Pharmacology , Medicine

Description / Table of Contents: Sommaire Des mesures de débit et de ventilation sanguine par unité de volume du poumon ont été effectuées par l'exploration du poumon à l'aide d'un compteur à scintillation après injection intraveineuse ou inhalation d'un gaz radioactif, le Xenon 133. Quelle que soit lat zone du poumon explorée, la fréquence des tops enregistrés sur un appreil courant est difficile à interpréter, et les calculs du débit sanguin par unité de volume sont fastidieux. Un système d'acquisition de mesure (data logger) a été spécialementconçu pour l'enregistrement parallèle de ces impulsions sur bandes perforées, compatible avec l'exploitation par le calculateur Elliott 4100. On présente une description détaillée de la façon dont ces informations sont introduites dans le data logger, ainsi que des modèles de rubans perforés. On donne également une comparaison du débit sanguin calculé par la méthode automatique et par la méthode ordinaire.

Abstract: Zusammenfassung Blutdurchfluß und Ventilation pro Einheit des Lungenvolumens wurde durch Abtasten (“Scanning”) der Lunge mit Szintillationszählern bestimmt, nachdem das radioaktive Gas, Xenon-133, intravenös injiziert oder inhaliert worden war. Die Zählrate kann für jedes Lungenniveau nach der Anzeige auf dem üblichen Registriergerär nur mühevoll abgelesen werden. Die Berechnung des Blutdurchflusses pro Einheit des Lungenvolumens auf jedem Niveau ist beschwerlich. Diese Zählraten werden durch einen speziell für diesen Zweck entwickelten Datensammler auf Lockstreifen parallel gesammelt, eine Sammelform, die zur Analyse auf einem Elliott-4000-Rechner geeignet ist. Der Vorgang der Informationseingabe in den Datensammler wird im einzelnen beschrieben, und Beispiele der Lochstreifenausgabe werden gezeigt. Die Blutdurchflußwerte aus der automatischen und der nichtautomatischen Methode werden verglichen.

Notes: Abstract Measurements of blood flow and ventilation per unit lung volume have been made by scanning the lung with scintillation counters after the intravenous injection or inhalation of the radioactive gas, xenon-133. The count rate at any level in the lung after display on a conventional recorder is laborious to read off and the calculations of blood flow per unit lung volume at each level are tedious. A data logger has been specially designed for parallel collection of these count rates on punch tape in a form acceptable for analysis by an Elliott 4100 computer. A detailed description of how information was presented to the data logger and examples of the punch tape output are given. A comparison of regional blood flow calculated by automated and non-automated methods is shown.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02476062

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

5

Electronic Resource

Variational and optimal control problems with delayed argument (1968)

Hughes, David K.

Springer

Journal of optimization theory and applications 2 (1968), S. 1-14

add to mindlist on the mindlist

Details

ISSN: 1573-2878

Source: Springer Online Journal Archives 1860-2000

Topics: Mathematics

Notes: Abstract This paper deals with variational and optimal control problems with delayed argument and presents analogs of the classical necessary conditions for optimality for problems in (n + 1)-space. It is mainly concerned with the functional $$J(y) = \int_a^b {f[t,y(t\user2{--}\tau ),y(t),\dot y(t\user2{--}\tau ),\dot y(t)] dt} $$ There are no side conditions; τ is a positive real number; andy is a continuous piecewise smooth vector function havingn components. The fundamental lemma of the calculus of variations is used in deriving an analog of the Euler equations. The usual construction is utilized in obtaining analogs of the Weierstrass and Legendre conditions. Also found is a fourth necessary condition involving the least proper value associated with a boundary value problem related to the second variation. A sufficient condition is obtained by the use of a simple expansion method. The last station of the paper outlines an extension of a maximal principle obtained by Hestenes to control problems which involve delays in both the state variable and the control variable.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00927159

Permalink