scholarly journals LOW RESISTANCE CONNECTIONS BETWEEN CELLS IN THE DEVELOPING ANTHER OF THE LILY

1970 ◽  
Vol 45 (3) ◽  
pp. 565-575 ◽  
Author(s):  
Nicholas C. Spitzer
Keyword(s):  
Electrical Coupling ◽  
Physiological Role ◽  
Lilium Longiflorum ◽  
The Other ◽  
Animal Tissues ◽  
Low Resistance ◽  
First Case ◽  
Cytoplasmic Bridges ◽  
Germinal Cells

Low resistance junctions were demonstrated between cells in anthers from young buds of Lilium longiflorum Croft by standard electrophysiological techniques. Electrodes containing a dye were used to stain impaled cells for later histological identification. Electrical coupling is widespread; germinal cells are coupled to one another; coupling is also observed between somatic elements, and germinal and somatic cells are similarly interconnected. Cytoplasmic bridges are implicated in the first case; plasmodesmata are probably responsible for the interactions in the other two. Although the physiological role of the low resistance junctions shown here and present in embryonic animal tissues is unknown, the possible function of this form of intercellular communication in the development of the anther is discussed.

scholarly journals Interphotoreceptor coupling: an evolutionary perspective

2021 ◽  
Author(s):  
Lorenzo Cangiano ◽  
Sabrina Asteriti
Keyword(s):  
Visual Information ◽  
Signal To Noise Ratio ◽  
Electrical Coupling ◽  
Physiological Role ◽  
Cellular Processes ◽  
Contact Points ◽  
Highly Sensitive ◽  
The Many ◽  
The Impact

AbstractIn the vertebrate retina, signals generated by cones of different spectral preference and by highly sensitive rod photoreceptors interact at various levels to extract salient visual information. The first opportunity for such interaction is offered by electrical coupling of the photoreceptors themselves, which is mediated by gap junctions located at the contact points of specialised cellular processes: synaptic terminals, telodendria and radial fins. Here, we examine the evolutionary pressures for and against interphotoreceptor coupling, which are likely to have shaped how coupling is deployed in different species. The impact of coupling on signal to noise ratio, spatial acuity, contrast sensitivity, absolute and increment threshold, retinal signal flow and colour discrimination is discussed while emphasising available data from a variety of vertebrate models spanning from lampreys to primates. We highlight the many gaps in our knowledge, persisting discrepancies in the literature, as well as some major unanswered questions on the actual extent and physiological role of cone-cone, rod-cone and rod-rod communication. Lastly, we point toward limited but intriguing evidence suggestive of the ancestral form of coupling among ciliary photoreceptors.

Significance of analysis of the mechanism of fingermarks formation, sizes and location – casework examples

2018 ◽  
Vol 301 ◽  
pp. 44-52
Author(s):  
Tomasz Kowalski ◽  
Keyword(s):  
Significant Role ◽  
Special Interest ◽  
The Other ◽  
Fatal Accident ◽  
Preliminary Stage ◽  
Additional Information ◽  
Expert Opinions ◽  
First Case ◽  
Initial Stage

The aim of the article to present the role of analysing the manner of generating fingermarks in the investigative proceedings. These examinations are based on the analysis of the location of the marks on a given background and aim at providing the requesting party additional information about the circumstances of the investigated incident. The Author refers to two unusual cases, in which Voivodeship Police Command Forensic Laboratory issued expert opinions in the area of fingerprint identification. In the first case, at the initial stage of the proceedings the circumstances and recovered evidential fingermarks indicated a fatal accident or manslaughter by means of a firearm. In the other case at the preliminary stage recovered evidence did not allow identification of the perpetrator due to incorrectly selected exhibits. These cases would not be off special interest to us without the significant role of proper recovering of fingermarks and their analysis in a broader context than just identification.

Cognitive Therapy and the Facilitation of Affect: Two Case Illustrations

1991 ◽  
Vol 5 (4) ◽  
pp. 305-316 ◽  
Author(s):  
Cory F. Newman
Keyword(s):  
Negative Affect ◽  
Positive Affect ◽  
Cognitive Therapy ◽  
The Other ◽  
Other Hand ◽  
First Case ◽  
Thinking Processes

Cognitive therapy, as conducted by Aaron T. Beck and his associates, is known for effectively teaching clients to modify the kinds of dysfunctional thinking processes that are associated with depression and a number of other disorders. On the other hand, cognitive therapy has developed a reputation for paying too little attention to emotionality and its expression thereof as part of treatment. In spite of this popular viewpoint, it is argued here that cognitive therapy is very much concerned with the appropriate experiencing of affect. Two brief case illustrations are presented that highlight the role of emotion enhancement as an important, congruent component of cognitive therapy. The first case demonstrates the facilitation of positive affect in therapy, while the second case example suggests that the augmentation of negative affect may also be appropriate during the course of cognitive therapy.

scholarly journals The Engineers Case Centenary: SCOTUS and the Origins of Australia's Scabrous Constitutional Signature

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Benjamen Franklen Gussen ◽  
Sahar Araghi
Keyword(s):  
United States ◽  
Word Length ◽  
The United States ◽  
United States Constitution ◽  
The Other ◽  
Common Denominator ◽  
High Court ◽  
First Case ◽  
High Court Of Australia

AbstractSince the Engineers Case decision in 1920, the role of the United States Constitution in interpreting the Australian Constitution has been diminished, leading to inefficiencies in High Court of Australia (HCA) dealing with constitutional issues. To explain this thesis, the article looks at the 7,657 cases decided by the HCA, from the first case in 1903, to the 31st of August 2020, the centenary of the Engineers Case. The analysis identifies outliers that have much higher complexity (in terms of word-length) than the other judgments. This complexity has one common denominator: comparative analysis with the United States Constitution. The article explains why this common denominator has resulted in such complexity, and concludes with possible research extensions on the roles of the Australian judiciary in embracing SCOTUS jurisprudence when interpreting the Australian Constitution.

A possible physiological role of milk epidermal growth factor in neonatal eyelid opening

1987 ◽  
Vol 252 (2) ◽  
pp. R376-R379
Author(s):  
O. Tsutsumi ◽  
A. Tsutsumi ◽  
T. Oka
Keyword(s):  
Growth Factor ◽  
Epidermal Growth Factor ◽  
Neonatal Period ◽  
Physiological Role ◽  
The Other ◽  
Simultaneous Administration ◽  
Newborn Mice ◽  
Submandibular Glands ◽  
Epidermal Growth

The eyelid opening of newborn mice occurs normally on day 13.9 +/- 1.8 after birth. When newborn mice were injected with anti-epidermal growth factor (EGF) antibody every other day starting on day 1 after birth, the eyelid opening was delayed by approximately 3 days. The effect of anti-EGF became less prominent as the treatment was started at later times: when it was given from day 7, no delay in eyelid opening was observed. On the other hand, eyelid opening was enhanced by approximately 3 days by EGF injection given on day 3 for every other day. This effect of EGF was antagonized by simultaneous administration of the anti-EGF antibody. EGF was present at a concentration of 6.6 ng/ml in the plasma of 1-wk-old pups nursed by their mother, but it was not detectable (less than 0.1 ng/ml) in the plasma of 3-wk-old weaned pups. EGF concentration in the submandibular glands, however, was 17 times greater in 3- than in 1-wk-old pups, i.e., 4.66 and 0.28 ng/mg of wet tissue, respectively. These results suggest that milk EGF may play a physiological role in eyelid opening during the neonatal period.

The effect of methyl lidocaine on lysophospholipid metabolism in hamster heart

1990 ◽  
Vol 68 (4) ◽  
pp. 745-750 ◽  
Author(s):  
Paul G. Tardi ◽  
Ricky Y. K. Man ◽  
Christopher R. McMaster ◽  
Patrick C. Choy
Keyword(s):  
Physiological Role ◽  
Fatty Acyl ◽  
The Other ◽  
Acylation Reaction ◽  
Alternate Pathway ◽  
Mammalian Tissues ◽  
High Concern ◽  
Acyl Chains ◽  
Hamster Heart

An important feature in the remodelling of fatty acyl chains in cellular phospholipids is the acylation of lysophospholipids. Since lysophospholipids are cytolytic al high concern rat ions, the acylation reaction may provide an alternate pathway for the removal of cellular lysophospholipids. However, the physiological role of the acylation process in the maintenance of lysophospholipid levels in mammalian tissues has not been clearly defined. In this study, methyl lidocaine was found to inhibit both lysophosphatidylcholine:acyl-CoA and lysophosphatidylethanolamine:acyl-CoA acyltransferase activities in the hamster heart, but the drug had no effect on the other lysophospholipid metabolic enzymes. When the heart was perfused with 0.5 mg methyl lidocaine/mL, acyltransferase activities were attenuated, but there was no change in the activities of phospholipase A or lysophospholipase. The levels of the major lysophospholipids in the heart were not altered by methyl lidocaine perfusion. When the hearts were perfused with labelled lysophospholipid in the presence of methyl lidocaine, there was a reduction in the formation of the phospholipid and an increase in the release of the free fatty acid. However, the labelling of lysophospholipid in the heart was not altered by methyl lidocaine. We postulate that the acylation reaction has no direct contribution to the maintenance of the lysophospholipid levels in the heart.Key words: lysophosphatidylcholine, lysophosphatidylethanolamine, acyltransferase, methyl lidocaine, hamster heart.

scholarly journals β-Fructofuranosidases from roots of dandelion (Taraxacum officinale Weber)

1972 ◽  
Vol 126 (3) ◽  
pp. 569-573 ◽  
Author(s):  
P. P. Rutherford ◽  
A. C. Deacon
Keyword(s):  
General Formula ◽  
Soluble Protein ◽  
Hydrolytic Enzymes ◽  
Deae Cellulose ◽  
Physiological Role ◽  
Taraxacum Officinale ◽  
The Other ◽  
Ph Optimum ◽  
Cellulose Column

1. Three β-fructofuranosidases were separated by chromatography on a DEAE-cellulose column from the soluble protein extracted from dandelion (Taraxacum officinale Weber) roots. 2. One enzyme, which acted on sucrose, was characterized as an invertase, with a Km of 2.00×10-2M and pH optimum of 7.5. 3. The other two enzymes are hydrolases (A and B), which act on the inulin series of oligosaccharides [general formula glucose-fructose-(fructose)n]. They both have a pH optimum of 4.0 and Km of 1.54×10-2M but differ in their chromatographic behaviour on DEAE-cellulose. Neither of the hydrolases is inhibited by sucrose. 4. The physiological role of these three hydrolytic enzymes is discussed.

scholarly journals The multifarious roles of Tol-Pal in Gram-negative bacteria

2020 ◽  
Vol 44 (4) ◽  
pp. 490-506
Author(s):  
Joanna Szczepaniak ◽  
Cara Press ◽  
Colin Kleanthous
Keyword(s):  
Outer Membrane ◽  
Cell Envelope ◽  
Physiological Role ◽  
Proton Motive Force ◽  
The Other ◽  
Gram Negative Bacteria ◽  
Gram Negative ◽  
The 1960S ◽  
Shed Light

ABSTRACT In the 1960s several groups reported the isolation and preliminary genetic mapping of Escherichia coli strains tolerant towards the action of colicins. These pioneering studies kick-started two new fields in bacteriology; one centred on how bacteriocins like colicins exploit the Tol (or more commonly Tol-Pal) system to kill bacteria, the other on the physiological role of this cell envelope-spanning assembly. The following half century has seen significant advances in the first of these fields whereas the second has remained elusive, until recently. Here, we review work that begins to shed light on Tol-Pal function in Gram-negative bacteria. What emerges from these studies is that Tol-Pal is an energised system with fundamental, interlinked roles in cell division – coordinating the re-structuring of peptidoglycan at division sites and stabilising the connection between the outer membrane and underlying cell wall. This latter role is achieved by Tol-Pal exploiting the proton motive force to catalyse the accumulation of the outer membrane peptidoglycan associated lipoprotein Pal at division sites while simultaneously mobilising Pal molecules from around the cell. These studies begin to explain the diverse phenotypic outcomes of tol-pal mutations, point to other cell envelope roles Tol-Pal may have and raise many new questions.

Plasma Levels of Protein S, Protein C, and Factor X: Effects of Sex, Hormonal State and Age

1995 ◽  
Vol 74 (05) ◽  
pp. 1271-1275 ◽  
Author(s):  
C M A Henkens ◽  
V J J Bom ◽  
W van der Schaaf ◽  
P M Pelsma ◽  
C Th Smit Sibinga ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Postmenopausal Women ◽  
Protein C ◽  
Blood Donors ◽  
Premenopausal Women ◽  
Protein S ◽  
The Other ◽  
Factor X ◽  
Normal Ranges

SummaryWe measured total and free protein S (PS), protein C (PC) and factor X (FX) in 393 healthy blood donors to assess differences in relation to sex, hormonal state and age. All measured proteins were lower in women as compared to men, as were levels in premenopausal women as compared to postmenopausal women. Multiple regression analysis showed that both age and subgroup (men, pre- and postmenopausal women) were of significance for the levels of total and free PS and PC, the subgroup effect being caused by the differences between the premenopausal women and the other groups. This indicates a role of sex-hormones, most likely estrogens, in the regulation of levels of pro- and anticoagulant factors under physiologic conditions. These differences should be taken into account in daily clinical practice and may necessitate different normal ranges for men, pre- and postmenopausal women.

On the role of the dispute between "non-possessors" and "Josephites" in the culture of Moscow's prediction

1998 ◽  
pp. 61-62
Author(s):  
N. S. Jurtueva
Keyword(s):  
The Other ◽  
Moral Transformation ◽  
15Th Century ◽  
The Future ◽  
Secular Power

In the XIV century. centripetal tendencies began to appear in the Moscow principality. Inside the Russian church, several areas were distinguished. Part of the clergy supported the specificobar form. The other understood the need for transformations in society. As a result, this led to a split in the Russian church in the 15th century for "non-possessors" and "Josephites". The former linked the fate of the future with the ideology of hesychasm and its moral transformation, while the latter sought support in alliance with a strong secular power.

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