scholarly journals STUDIES UPON THE RELATIONSHIP BETWEEN SURFACE TENSION AND THE ACTION OF DISINFECTANTS, WITH SPECIAL REFERENCE TO HEXYLRESORCINOL

1927 ◽  
Vol 13 (3) ◽  
pp. 163-182 ◽  
Author(s):  
Martin Frobisher
Keyword(s):  
Surface Tension ◽  
Special Reference ◽  
The Relationship

scholarly journals Influence of moisture content on the contact angle and surface tension measured on birch wood surfaces

2021 ◽  
Author(s):  
Rami Benkreif ◽  
Fatima Zohra Brahmia ◽  
Csilla Csiha
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Moisture Content ◽  
Solid Wood ◽  
Contact Angles ◽  
Surface Moisture ◽  
Wood Coatings ◽  
The Relationship ◽  
Wood Surfaces

AbstractSurface tension of solid wood surfaces affects the wettability and thus the adhesion of various adhesives and wood coatings. By measuring the contact angle of the wood, the surface tension can be calculated based on the Young-Dupré equation. Several publications have reported on contact angle measured with different test liquids, under different conditions. Results can only be compared if the test conditions are similar. While the roles of the drop volume, image shooting time etc., are widely recognized, the role of the wood surface moisture content (MC) is not evaluated in detail. In this study, the effect of wood moisture content on contact angle values, measured with distilled water and diiodomethane, on sanded birch (Betula pendula) surfaces was investigated, in order to find the relationship between them. With increasing MC from approximately 6% to 30%, increasing contact angle (decreasing surface tension) values were measured according to a logarithmic function. The function makes possible the calculation of contact angles that correspond to different MCs.

Effects of surface tension and viscosity on airway reopening

1990 ◽  
Vol 69 (1) ◽  
pp. 74-85 ◽  
Author(s):  
D. P. Gaver ◽  
R. W. Samsel ◽  
J. Solway
Keyword(s):  
Surface Tension ◽  
Fluid Viscosity ◽  
Opening Pressure ◽  
Viscous Forces ◽  
Considerable Portion ◽  
Airway Opening ◽  
Wall Compliance ◽  
Large Opening ◽  
Surface Tension Forces ◽  
The Relationship

We studied airway opening in a benchtop model intended to mimic bronchial walls held in apposition by airway lining fluid. We measured the relationship between the airway opening velocity (U) and the applied airway opening pressure in thin-walled polyethylene tubes of different radii (R) using lining fluids of different surface tensions (gamma) and viscosities (mu). Axial wall tension (T) was applied to modify the apparent wall compliance characteristics, and the lining film thickness (H) was varied. Increasing mu or gamma or decreasing R or T led to an increase in the airway opening pressures. The effect of H depended on T: when T was small, opening pressures increased slightly as H was decreased; when T was large, opening pressure was independent of H. Using dimensional analysis, we found that the relative importance of viscous and surface tension forces depends on the capillary number (Ca = microU/gamma). When Ca is small, the opening pressure is approximately 8 gamma/R and acts as an apparent “yield pressure” that must be exceeded before airway opening can begin. When Ca is large (Ca greater than 0.5), viscous forces add appreciably to the overall opening pressures. Based on these results, predictions of airway opening times suggest that airway closure can persist through a considerable portion of inspiration when lining fluid viscosity or surface tension are elevated.

scholarly journals Between grammar and dictionary: With special reference to Slovene verb

2013 ◽  
pp. 91-114
Author(s):  
Andreja Zele
Keyword(s):  
Special Reference ◽  
Temporal Structure ◽  
Essential Characteristic ◽  
Verbal Aspect ◽  
Language System ◽  
The Past ◽  
The Relationship

Slovene resources confirm that verbal aspect and aspectualness depend on the morphological, lexical, syntactic, and other characteristics of a particular language. Since verbal aspect is directly connected to the meaning of a particular verb, as well as its structural and semantic-syntactic abilities, it is considered to be an essential characteristic in terms of the language system of every language. The specific features of aspectualness, especially if we take into account its connectedness to a given language system, are confirmed by various contrastive studies, which also place considerable emphasis on a number of general aspectual characteristics that can be applied to all languages. Within every language system, for example, the grammatical (morphological), lexical, and syntactic aspectualness are distinguished from one another, whereas in the case of a particular text, the relationship between aspect, time, and mood cannot be overlooked. What remains central in both current and future discussions is establishing the relationship between aspectualness and temporality within a particular language or languages. Cases of ?aspectual competitiveness?, related to the temporal structure of a given sentence, have been noted in Slovene as well, especially in examples like Sem ze vecerjal - Sem ze povecerjal (?I already had dinner - I already finished my dinner?), Vedno smo k obstojecemu doprinesli tudi nekaj novega - Vedno smo k obstojecemu doprinasali tudi nekaj novega (?We always contributed something new to the existing condition - We always used to contribute something new to the existing condition?), etc. That the behavior of the imperfect may vary in the past and future is shown by examples like Temperatura se je dvigovala ?visala, padala in spet visala? (The temperature kept rising ?rising, falling, and rising again?), Temperatura se bo dvigovala ?vedno samo navzgor, brez nihanja? (The temperature will keep on rising ?it will rise without falling?). It is also important how a particular dictionary presents verbal valency as a developmental category. The most common is the change from monovalent verbs to bivalent or governed verbs. When considering the valency of non-deverbal nouns and adjectives, it must be noted that especially in the case of nondeverbal adjectives, valency is the consequence of the dynamic meaning of semantically similar verbs, which can replace non-deverbal adjectives in a particular sentence.

XIX.—Notes on the Kidston Collection of Fossil Plant Slides. No. I. The Anatomy of the Axis of Lepidodendron Brownii Unger sp., with special reference to the Relationship between this Stem and Lepidostrobus Brownii Unger sp.

1933 ◽  
Vol 57 (2) ◽  
pp. 547-555 ◽  
Author(s):  
Mary G. Calder
Keyword(s):  
Special Reference ◽  
Secondary Xylem ◽  
Fossil Plant ◽  
Botany Department ◽  
History Of ◽  
Secondary Wood ◽  
The University ◽  
The Relationship ◽  
Carboniferous Limestone ◽  
As If

The Kidston Collection of fossil plant slides in the Botany Department of the University of Glasgow contains a number of sections of a very notable stem labelled “Lepidodendron textum, Kidston, n.sp.” No mention is made of this species in any of Dr Kidston's publications, but the correspondence relevant to the Collection indicates the history of the slides. This may be briefly summarised.As early as 1883, Dr Kidston had received from Mr J. Coutts two sections (Nos. 51 and 52) of this stem, which had been collected by the latter at East Kilbride, Lanarkshire, Scotland, from the Carboniferous Limestone Series of the Calderwood Beds (Hosie Limestone) in the Lower Limestone Group. Dr Kidston postponed description of this stem till he had better sections at his disposal; the specimen, however, was lost, and it was not till many years later that he rediscovered it in Dr John Young's collection in the Glasgow Municipal Museum, and had more sections cut from it (Nos. 1144–1153). No manuscript notes of Dr Kidston's descriptive of these slides have been found, with the exception of a pencilled reference in his manuscript slide catalogue, opposite Nos. 51 and 52, to the “foliar bundles—there is an appearance as if there was a development of secondary xylem, whereas the axial bundle has no secondary wood.”

scholarly journals Studies on the antibacterial properties of the bile acids and some compounds derived from cholanic acid

1947 ◽  
Vol 134 (877) ◽  
pp. 523-537 ◽  
Keyword(s):  
Molecular Structure ◽  
Staphylococcus Aureus ◽  
Surface Tension ◽  
Bile Acids ◽  
Antibacterial Properties ◽  
Simple Relationship ◽  
The Relationship ◽  
Positive Complex ◽  
Cholanic Acid ◽  
Limiting Dilution

In this work the bile acids and certain of their derivatives have been studied with regard to their bacteriostatic power and relative activities in removing the Gram-positive complex from yeast. No correlation between these properties was obtained. A simple relationship was apparent, however, between the bacteriostatic activities of the compounds and their ability to depress the surface tension of the metabolism medium. The limiting dilution at which the 'active' bile acids were bacteriostatic for Staphylococcus aureus corresponded to a depression of the surface tension of the medium by approximately 4∙5 dynes. The relationship between bacteriostatic power and surface activity was only valid for this particular series of compounds of closely related molecular structure.

Gill and Body Surface Areas of the Carp in relation to Body Mass, With Special Reference To The Metabolism-Size Relationship

1985 ◽  
Vol 117 (1) ◽  
pp. 1-14 ◽  
Author(s):  
SHIN OIKAWA ◽  
YASUO ITAZAWA
Keyword(s):  
Special Reference ◽  
Body Mass ◽  
Body Surface ◽  
Larval Stage ◽  
The Body ◽  
Positive Allometry ◽  
Surface Areas ◽  
Gill Area ◽  
Resting Metabolism ◽  
The Relationship

The relationships of resting metabolism per unit mass of body to gill and body surface areas were examined by measuring gill, body surface and fin areas of carp ranging from 0.0016 to 2250g. There was a triphasic allometry for the relationship between gill area and body mass: during the prelarval (0.0016–0.003 g) and postlarval (0.003–0.2g) stages there was a positive allometry (slopes of 7.066 and 1.222, respectively), during the juvenile and later stages (0.2–2250 g) there was a negative allometry with a slope of 0.794. There was a diphasic negative allometry for the relationship between surface area of the body or the fins and body mass, with a slope of 0.596 or 0.523 during the larval stage and 0.664 or 0.724 during the juvenile and later stages, respectively. Except for the 3rd phase (juvenile to adult) of gill area, these slopes were significantly different (P<0.01) from the slope for the relationship between resting metabolism and body mass of intact carp (0.84; value from Winberg, 1956). It is considered, therefore, that gill, body surface and fin areas do not directly regulate the resting metabolism of the fish, in the larval stage at least.

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