scholarly journals [Feedback control mechanisms of plant cell expansion]

1992 ◽  
Author(s):  
D.J. Cosgrove
Keyword(s):  
Feedback Control ◽  
Plant Cell ◽  
Cell Expansion ◽  
Control Mechanisms

A NEW APPROACH FOR INVESTIGATING HYPOTHALAMO-PITUITARY-GONADAL AND ADRENAL FEEDBACK CONTROL MECHANISMS: ACTIVE IMMUNIZATION WITH STEROIDS

1974 ◽  
Vol 76 (3) ◽  
pp. 556-569 ◽  
Author(s):  
E. Nieschlag ◽  
K. H. Usadel ◽  
H. K. Kley ◽  
U. Schwedes ◽  
K. Schöffling ◽  
...  
Keyword(s):  
Feedback Control ◽  
Leydig Cells ◽  
Positive Response ◽  
Active Immunization ◽  
Biologically Active ◽  
Control Group ◽  
Control Mechanisms ◽  
New Approach ◽  
Biological Neutralization ◽  
Group Serum

ABSTRACT A new method for the investigation of hypothalamo-pituitary-gonadal and adrenal feedback control mechanisms based on the biological neutralization of gonadal and adrenal steroids by active immunization is proposed. The regulatory influence of a given steroid in the feedback control is proved when reduction of the free, biologically active fraction of this steroid caused by antibody binding induces a positive response of the pituitary, thus effecting gonadal or adrenal hypertrophy and hyperfunction. The advantages and limitations of the new model are demonstrated by the effects of active immunization of rabbits with cortisol (F), aldosterone (Aldo), dehydroepiandrosterone (DHA), androstenedione (Δ4-A), testosterone (T), 5α-dihydrotestosterone (5α-DHT), 5β-DHT and oestradiol (E2). In the immunized animals and in a control group serum concentrations of total corticosteroids (TC), DHA, T, Δ4-A, E1, E2, LH and FSH, the percentage of binding of steroids in serum and the specificity of the antisera are determined. The testes are evaluated by histometry and the nuclear volume of the adrenocortical and Leydig cells is measured.

scholarly journals A novel, cellulose synthesis inhibitory action of ancymidol impairs plant cell expansion

2008 ◽  
Vol 59 (14) ◽  
pp. 3963-3974 ◽  
Author(s):  
J. Hofmannova ◽  
K. Schwarzerova ◽  
L. Havelkova ◽  
P. Borikova ◽  
J. Petrasek ◽  
...  
Keyword(s):  
Plant Cell ◽  
Cell Expansion ◽  
Inhibitory Action ◽  
Cellulose Synthesis

scholarly journals Ca2+ Signaling in the Inner Ear

Physiology ◽  
2007 ◽  
Vol 22 (2) ◽  
pp. 131-144 ◽  
Author(s):  
Fabio Mammano ◽  
Mario Bortolozzi ◽  
Saida Ortolano ◽  
Fabio Anselmi
Keyword(s):  
Feedback Control ◽  
Inner Ear ◽  
Control Mechanisms ◽  
Sensory Receptors ◽  
Key Players ◽  
Mechanical Disturbances

The inner ear contains delicate sensory receptors that have adapted to detect the minutest mechanical disturbances. Ca2+ ions are implicated in all steps of the transduction process, as well as in its regulation by an impressive ensemble of finely tuned feedback control mechanisms. Recent studies have unveiled some of the key players, but things do not sound quite right yet.

scholarly journals Handedness in plant cell expansion: a mutant perspective on helical growth

2019 ◽  
Vol 225 (1) ◽  
pp. 53-69 ◽  
Author(s):  
Henrik Buschmann ◽  
Agnes Borchers
Keyword(s):  
Plant Cell ◽  
Cell Expansion ◽  
Helical Growth

scholarly journals The Role of Brachypodium distachyon Wall-Associated Kinases (WAKs) in Cell Expansion and Stress Responses

Cells ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 2478
Author(s):  
Xingwen Wu ◽  
Antony Bacic ◽  
Kim L. Johnson ◽  
John Humphries
Keyword(s):  
Cell Wall ◽  
Stress Response ◽  
Plant Cell ◽  
Stress Responses ◽  
Cell Expansion ◽  
Plant Cell Wall ◽  
Brachypodium Distachyon ◽  
Critical Role ◽  
Cell Integrity

The plant cell wall plays a critical role in signaling responses to environmental and developmental cues, acting as both the sensing interface and regulator of plant cell integrity. Wall-associated kinases (WAKs) are plant receptor-like kinases located at the wall—plasma membrane—cytoplasmic interface and implicated in cell wall integrity sensing. WAKs in Arabidopsis thaliana have been shown to bind pectins in different forms under various conditions, such as oligogalacturonides (OG)s in stress response, and native pectin during cell expansion. The mechanism(s) WAKs use for sensing in grasses, which contain relatively low amounts of pectin, remains unclear. WAK genes from the model monocot plant, Brachypodium distachyon were identified. Expression profiling during early seedling development and in response to sodium salicylate and salt treatment was undertaken to identify WAKs involved in cell expansion and response to external stimuli. The BdWAK2 gene displayed increased expression during cell expansion and stress response, in addition to playing a potential role in the hypersensitive response. In vitro binding assays with various forms of commercial polysaccharides (pectins, xylans, and mixed-linkage glucans) and wall-extracted fractions (pectic/hemicellulosic/cellulosic) from both Arabidopsis and Brachypodium leaf tissues provided new insights into the binding properties of BdWAK2 and other candidate BdWAKs in grasses. The BdWAKs displayed a specificity for the acidic pectins with similar binding characteristics to the AtWAKs.

scholarly journals The role of feedback control mechanisms on the establishment of oscillatory regimes in the Ras/cAMP/PKA pathway in S. cerevisiae

2012 ◽  
Vol 2012 (1) ◽  
Author(s):  
Daniela Besozzi ◽  
Paolo Cazzaniga ◽  
Dario Pescini ◽  
Giancarlo Mauri ◽  
Sonia Colombo ◽  
...  
Keyword(s):  
Feedback Control ◽  
Control Mechanisms ◽  
Pka Pathway

Articulation and Stress/Juncture Production Under Oral Anesthetization and Masking

1971 ◽  
Vol 14 (2) ◽  
pp. 271-282 ◽  
Author(s):  
Sylvia A. Gammon ◽  
Philip J. Smith ◽  
Raymond G. Daniloff ◽  
Chin W. Kim
Keyword(s):  
Feedback Control ◽  
Oral Cavity ◽  
White Noise ◽  
Speech Production ◽  
Local Anesthesia ◽  
The Other ◽  
Control Mechanisms ◽  
Combined Stress ◽  
Noise Masking ◽  
High Degree

Eight subjects, half of them naive and the other half aware of the purpose of the experiment, spoke 30 pairs of sentences involving the production of intricate stress/juncture patterns along with a passage containing all major consonant phonemes in English in various intraword positions. All subjects spoke all materials under: (1) normal conditions, (2) 110 dB re: 0.0002 ubar white noise masking, (3) extensive local anesthesia of the oral cavity, and (4) masking and anesthesia combined. Stress and juncture patterns were correctly produced despite all feedback disruption, and there was no difference between naive and aware subjects. Noise masking produced a decline in speech quality and a disruption of normal rhythm, both of which were even more seriously affected by anesthesia and anesthesia plus masking. There were no significant vowel misarticulations under any condition, but there was nearly a 20% rate of consonant misartiqulation under anesthesia and anesthesia and noise. Mis-articulation was most severe for fricatives and affricates in the labial and alveolar regions, presumably because these productions demand a high degree of precision of articulate shape and location and hence, intact feedback. Results are discussed in terms of feedback-control mechanisms for speech production.

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