Sims Investigations of Gettering Centers in Ion-Implanted and Annealed Silicon

Gammer, K.; Gritsch, Martin; Peeva, A.; Kögler, R.; Hutter, Herbert

doi:10.1081/tma-120002459

Cited by 7 publications

(4 citation statements)

References 7 publications

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“…Secondary ion mass spectrometry (SIMS), a method mainly used by physicists for material analysis (for recent references see, e.g., Gammer et al [2002] or Korobeinikova et al [2002]), has revealed intracellular calcium changes associated with the recall function in flax seedlings previously subjected to cold shock or other external stimuli . Early attempts (Henry-Vian et al, 1995 a, b) Global view of the system.…”

Section: Discussionmentioning

confidence: 99%

A Logical (Discrete) Formulation for the Storage and Recall of Environmental Signals in Plants

et al. 2004

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When subjected to an appropriate asymmetric stimulus, seedlings of Bidens pilosa L. "store" a symmetry-breaking instruction that will finally take effect (in the form of a differential growth of the cotyledonary buds) only if the plants are in a state in which they can "recall" this information. The ability of the plants to recall the stored symmetry-breaking instruction may be switched "on" or "off" by the application of a variety of stimuli. Although its detailed phenomenology is rather complicated, the overall behaviour of the plant storage/recall system can be modelled by use of an asynchronous, logical (discrete) description involving positive and negative feedback circuits, which are required for the existence of multi-stationarity and stability, respectively. The state tables, as used in this formalism, give a concise and easy-to-handle description of the evolution of the system and make it particularly easy to determine its stable states. This modelling approach may be extended to the formulation of many other experimental systems.

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Section: Discussionmentioning

confidence: 99%

A Logical (Discrete) Formulation for the Storage and Recall of Environmental Signals in Plants

et al. 2004

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“…Further study of the model systems discussed above would benefit from knowledge of the distribution of ions. This may be provided by secondary ion mass spectrometry (SIMS), a method largely used by physicists for materials studies (see, e.g., [29,30]), now available for application to biological specimens [31][32][33] after appropriate preparation of dehydrated tissue sections [34,35] or using frozen hydrated samples [36].…”

Section: Discussionmentioning

confidence: 99%

Biological processes in organised media

Thellier¹,

Vincent²,

Alexandre³

et al. 2003

Comptes Rendus. Biologies

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Embedding a simple Michaelis-Menten enzyme in a gel slice may allow the catalysis of not only scalar processes but also vectorial ones, including uphill transport of a substrate between two compartments, and may make it seem as if two enzymes or transporters are present or as if an allosterically controlled enzyme/transporter is operating. The values of kinetic parameters of an enzyme in a partially hydrophobic environment are usually different from those actually measured in a homogeneous aqueous solution. This implies that fitting kinetic data (expressed in reciprocal co-ordinates) from in vivo studies of enzymes or transporters to two straight lines or a sigmoidal curve does not prove the existence of two different membrane mechanisms or allosteric control. In the artificial transport systems described here, a functional asymmetry was sufficient to induce uphill transport, therefore, although the active transport systems characterised so far correspond to proteins asymmetrically anchored in a membrane, the past or present existence of structurally symmetrical systems of transport in vivo cannot be excluded. The fact that oscillations can be induced in studies of the maintenance of the electrical potential of frog skin by addition of lithium allowed evaluation of several parameters fundamental to the functioning of the system in vivo (e.g., relative volumes of internal compartments, characteristic times of ionic exchanges between compartments). Hence, under conditions that approach real biological complexity, increasing the complexity of the behaviour of the system may provide information that cannot be obtained by a conventional, reductionist approach. To cite this article: M.

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“…SIMS is a standard microanalytical and imaging technique used in physics [24][25][26] and biology. [27] Briefly, it consists in bombarding under high vacuum a solid specimen (here a thin section of a resin-embedded hypocotyl sample) with a beam of accelerated ions (primary ions) a few keV in energy.…”

Section: Sims Imagingmentioning

confidence: 99%

Sims Study of the Calcium-Deprivation Step Related to Epidermal Meristem Production Induced in Flax by Cold Shock or Radiation From a GSM Telephone

Tafforeau

Verdus

Norris

et al. 2002

Journal of Trace and Microprobe Techniques

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Exposing seedlings of the flax, Linum usitatissimum L., to a variety of weak environmental stresses plus a 2-day calcium deprivation triggers the common response of production of epidermal meristems in the hypocotyl. Here, we show that the same response was induced by a 1 min cold shock. Epidermal meristem production was also induced by a single 2-h exposure to radiation emitted at 0.9 GHz at non-thermal levels by a GSM telephone. This flax-based system is therefore well suited to studying the effects of low intensity stimuli, including those of electromagnetic radiation. To begin to determine the underlying mechanisms, in which calcium is implicated, it is desirable to analyse the changes in ions in the tissues affected. We therefore performed a Secondary Ion Mass Spectrometry (SIMS) study of the 611 distribution of the main inorganic cations in the hypocotyl of control and calcium-deprived seedlings. This showed decreases in calcium, sodium and potassium and an increase in magnesium that did not alter substantially the overall ratio of divalent to monovalent cations.

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Sims Investigations of Gettering Centers in Ion-Implanted and Annealed Silicon

Cited by 7 publications

References 7 publications

A Logical (Discrete) Formulation for the Storage and Recall of Environmental Signals in Plants

A Logical (Discrete) Formulation for the Storage and Recall of Environmental Signals in Plants

Biological processes in organised media

Sims Study of the Calcium-Deprivation Step Related to Epidermal Meristem Production Induced in Flax by Cold Shock or Radiation From a GSM Telephone

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