Conservation of Diffusive Mass Component in State-Flux Forms

2016 ◽  
pp. 181-196
Author(s):  
George L. Danko
Keyword(s):  
Mass Component

scholarly journals Relaxation of Star Clusters and Color Gradients

1999 ◽  
Vol 190 ◽  
pp. 454-455
Author(s):  
Christian Boily
Keyword(s):  
Aspect Ratio ◽  
Test Problem ◽  
Star Clusters ◽  
Newtonian Gravity ◽  
Ram Pressure ◽  
Color Gradients ◽  
Initial Orbit ◽  
Mass Component

Large interstellar distances imply that protostars are dynamically decoupled from gas ram pressure (see, e.g., Aarseth, Lin & Papaloizou 1988) and are effectively isolated self-gravitating objects. With this in mind we apply Newtonian gravity to collapsing cold spheroids of point masses to model the Lin-Mestel-Shu (1965) solution for dust. Incomplete violent relaxation (e.g., van Albada 1982) means that traces of the initial orbit distribution in energy remain. We show here that furthermore the degree of orbit mixing achieved correlates well with initial morphology, by collapsing two-mass component uniform spheroids of different aspect ratio. We setup a test problem to seek out a relation between orbit survival and initial morphology which we then solve numerically.

A high-mass-ratio red-dwarf contact binary with an extremely cool close-in red dwarf

2019 ◽  
Author(s):  
Xiao-Hui Fang ◽  
Shengbang Qian ◽  
Miloslav Zejda ◽  
Soonthornthum Boonrucksar ◽  
Xiao Zhou ◽  
...  
Keyword(s):  
Orbital Period ◽  
Light Curves ◽  
High Mass ◽  
Mass Ratio ◽  
Third Body ◽  
Dynamical Interaction ◽  
The Third ◽  
Short Period ◽  
Contact Binaries ◽  
Mass Component

Abstract 1SWASP J161335.80$-$284722.2 (hereafter J161335) is an eclipsing red-dwarf binary with an orbital period of $0.229778\:$d, which is around the short-period limit for contact binaries. Three sets of multi-color light curves of J161335 were obtained from different telescopes in 2015 and 2016 and are analyzed using the Wilson–Devinney method. We discovered that the system is a W-type contact system with a contact degree of 19% and a high mass ratio of 0.91. By using all available eclipse times, we found that the observed $-$ calculated $(O-C)$ diagram displays a cyclic oscillation with an amplitude of 0.00196($\pm 0.00006)\:$d and a period of 4.79($\pm 0.14)\:$yr while it undergoes a downward parabolic change. This downward variation corresponds to a continuous decrease in the orbital period at a rate of $dP/dt = -4.26(\pm$0.01) $\times$ 10$^{-7}\:$d$\:$yr$^{-1}$. The small-amplitude oscillation is explained as the light travel-time effect from the gravitational influence of a third body with a lowest mass of $M _{3}$ = 0.15($\pm 0.01)M_{\,\odot }$. In solving the light curves, we found that the third light is increasing, with the wavelength suggesting that the third body may be a cool red dwarf. This is in agreement with the results obtained by analyzing the $O-C$ diagram. The tertiary red dwarf is orbiting the central red-dwarf binary at an orbital separation of 2.8($\pm 0.2$) au. These results suggest that the J161335 system may be formed through early dynamical interaction where the original low-mass component was replaced by a higher-mass third body and the lower-mass component was kicked out to a wider orbit. In this way, a hierarchical triple system similar to J161335 with a high-mass-ratio binary and a small close-in third body is formed.

scholarly journals Classical electrodynamics without singularities

1948 ◽  
Vol 195 (1042) ◽  
pp. 323-336 ◽  
Keyword(s):  
World Line ◽  
Equations Of Motion ◽  
The Self ◽  
Classical Electrodynamics ◽  
Dirac Equations ◽  
Form Function ◽  
The World ◽  
Extended Charge ◽  
Electron Radius ◽  
Mass Component

It is shown that it is possible to construct a theory of the electron with an extended charge distribution in a Lorentz invariant way by introducing a four-dimensional form function. The electromagnetic field quantities reduce to those given by the ordinary theory at distances large compared with the electron radius r 0 , but remain finite on the world line. The equations of motion, after elimination ’of the self field, become integro-differential equations. In the case of small accelerations an expansion in powers of r 0 similar to that of Lorentz is obtained, in which only odd powers of r 0 occur. The first term endows the electron with a mass component of electromagnetic origin. For accelerations small compared with the characteristic frequency l/ r 0 of the electron, the Lorentz-Dirac equations are a good approximation; for larger accelerations, higher terms become important.

Point Movement Trace Vs. The Range Of Mining Exploitation Effects In The Rock Mass

2015 ◽  
Vol 60 (4) ◽  
pp. 921-929 ◽  
Author(s):  
Anton Sroka ◽  
Stanisław Knothe ◽  
Krzysztof Tajduś ◽  
Rafał Misa
Keyword(s):  
Rock Mass ◽  
Continuity Equation ◽  
Mass Point ◽  
Horizontal Movement ◽  
In Situ Observations ◽  
Main Components ◽  
Movement Trace ◽  
The Relationship ◽  
Mass Component

Abstract The geometric-integral theories of the rock mass point movements due to mining exploitation assume the relationship between the progress of subsidence and horizontal movement. By analysing the movement trace of a point located on the surface, and the influence of the mining exploitation in the rock mass, an equation describing the relationship between the main components of the deformation conditions was formulated. The result is consistent with the in situ observations and indicates the change of the rock mass component volume due to mining exploitation. The analyses and in situ observations demonstrate clearly that the continuity equation adopted in many solutions in the form: $\sum\limits_{i = 1}^{i = 3} {\varepsilon _{ii}= 0}$ is fundamentally incorrect.

scholarly journals Biochemical analysis of a bladder-cancer-associated mucin: structural features and epitope characterization

1997 ◽  
Vol 321 (3) ◽  
pp. 889-896 ◽  
Author(s):  
Alain BERGERON ◽  
Hélène LaRUE ◽  
Yves FRADET
Keyword(s):  
Molecular Mass ◽  
Structural Features ◽  
High Molecular Mass ◽  
Antigenic Determinants ◽  
Heat Denaturation ◽  
Appreciable Effect ◽  
Carbohydrate Epitopes ◽  
Reducing Conditions ◽  
Epitope Characterization ◽  
Mass Component

Three monoclonal antibodies (mAbs), M344, M300 and M75, were shown to define a unique tumour-associated antigen (TAA) of superficial bladder tumours. The antigenic determinants are expressed on a very-high-molecular-mass component and, in about 50% of the positive samples, one determinant is also detected on a 62 kDa molecular species, observed only under reducing conditions. The objectives of the present study were to characterize further this TAA by analysing (1) the biochemical nature of the epitopes recognized by the three mAbs, and (2) the biochemical and structural features of the molecule bearing them. The antigenicity was resistant to heat denaturation, trypsin and α-chymotrypsin treatments but highly sensitive to papain and Pronase digestion. NaIO4 oxidation decreased reactivity to mAbs M344 and M300 but enhanced reactivity to mAb M75. The three determinants were insensitive to β-galactosidase and α-l-fucosidase but were sensitive to Vibrio choleraeneuraminidase. None of the three mAbs reacted with ovine, bovine or porcine submaxillary mucins. Deglycosylation with O-glycosidase or trifluoromethanesulphonic acid completely abolished the reactivity of the mAbs whereas N-glycosidase F deglycosylation had no appreciable effect. The presence on the molecule of cryptic Galβ(1→3)GalNAc as a major core disaccharide was demonstrated by a heterologous sandwich assay using mAb M75 and peanut agglutinin. Thiol reduction using β-mercaptoethanol increased mobility of the high-molecular-mass component in polyacrylamide gels. We thus conclude that mAbs M344 and M300 react with sialylated carbohydrate epitopes, and mAb M75 reacts with a partially cryptic and periodate-resistant sialylated epitope expressed on a typical secreted high-molecular-mass oligomeric mucin which we named MAUB for mucin antigen of the urinary bladder.

scholarly journals Polygenic risk modeling with latent trait-related genetic components

2019 ◽  
Author(s):  
Matthew Aguirre ◽  
Yosuke Tanigawa ◽  
Guhan Ram Venkataraman ◽  
Rob Tibshirani ◽  
Trevor Hastie ◽  
...  
Keyword(s):  
Fat Mass ◽  
Genetic Risk ◽  
Complex Traits ◽  
Fat Free Mass ◽  
Risk Scores ◽  
Polygenic Risk Score ◽  
Genetic Associations ◽  
Polygenic Risk ◽  
Genetic Components ◽  
Mass Component

AbstractPolygenic risk models have led to significant advances in understanding complex diseases and their clinical presentation. While models like polygenic risk scores (PRS) can effectively predict outcomes, they do not generally account for disease subtypes or pathways which underlie within-trait diversity. Here, we introduce a latent factor model of genetic risk based on components from Decomposition of Genetic Associations (DeGAs), which we call the DeGAs polygenic risk score (dPRS). We compute DeGAs using genetic associations for 977 traits in the UK Biobank and find that dPRS performs comparably to standard PRS while offering greater interpretability. We show how to decompose an individual’s genetic risk for a trait across DeGAs components, highlighting specific results for body mass index (BMI), myocardial infarction (heart attack), and gout in 337,151 white British individuals, with replication in a further set of 25,486 non-British white individuals from the Biobank. We find that BMI polygenic risk factorizes into components relating to fat-free mass, fat mass, and overall health indicators like physical activity measures. Most individuals with high dPRS for BMI have strong contributions from both a fat mass component and a fat-free mass component, whereas a few ‘outlier’ individuals have strong contributions from only one of the two components. Overall, our method enables fine-scale interpretation of the drivers of genetic risk for complex traits.

Wheat embryo ribonucleates. X. Metabolism of 3′-hydroxyl termini in the conserved mRNA and tRNA of imbibing wheat embryos

1978 ◽  
Vol 56 (3) ◽  
pp. 197-202 ◽  
Author(s):  
T. D. Kennedy ◽  
B. G. Lane
Keyword(s):  
Ribosomal Rna ◽  
Messenger Rna ◽  
Insoluble Fraction ◽  
Wheat Embryo ◽  
Selective Labelling ◽  
Wheat Embryos ◽  
Chain Lengths ◽  
Hydroxyl Termini ◽  
Terminal Poly ◽  
Mass Component

There are conserved complements of ribosomal RNA (rRNA), transfer RNA (tRNA), and messenger RNA (mRNA) in dry wheat embryos. Although early labelling of RNA is largely directed toward the synthesis of complete molecules of nascent rRNA and mRNA, there is also selective labelling at 3′-hydroxyl termini in conserved polynucleotides when dry wheat embryos are subjected to short-term (0.5 h) imbibition in a medium that contains tritium-labelled adenosine, guanosine, cytidine, and uridine. Conserved tRNA is the principal mass component in NaCl-soluble RNA (sRNA) and most of the 'rapid labelling' of sRNA (rl-sRNA) is a result of labelling at 3′-hydroxyl termini in conserved tRNA. By contrast, although conserved rRNA is the principal mass component in NaCl-insoluble RNA (iRNA), most of the labelled 3′-hydroxyl termini in 'rapidly labelled' iRNA (rl-iRNA) do not appear to derive from rRNA. Although about 10% of the labelled 3′-hydroxyl termini in rl-iRNA originates in conserved poly(A)-rich mRNA, the available evidence leads to the conclusion that most of the labelled 3′-hydroxyl termini in rl-iRNA originates in an unusual NaCl-insoluble fraction of conserved tRNA. During the course of extended imbibition, between 0.5 and 5 h, there are characteristic changes in the chain lengths and labelling patterns for 3′-hydroxyl terminal poly(A) sequences in mRNA. Analytical and physiological implications of these data are subjects of discussion.

scholarly journals DISCOVERY AND CHARACTERIZATION OF WIDE BINARY SYSTEMS WITH A VERY LOW MASS COMPONENT

2015 ◽  
Vol 802 (1) ◽  
pp. 37 ◽  
Author(s):  
Frédérique Baron ◽  
David Lafrenière ◽  
Étienne Artigau ◽  
René Doyon ◽  
Jonathan Gagné ◽  
...  
Keyword(s):  
Binary Systems ◽  
Wide Binary ◽  
Low Mass ◽  
Mass Component

Dilution of plasma with Tris buffer increases measured catecholamines in plasma.

1987 ◽  
Vol 33 (3) ◽  
pp. 408-411 ◽  
Author(s):  
J L Cuche ◽  
F Selz ◽  
G Ruget ◽  
M Gentil ◽  
C Gaudin
Keyword(s):  
Molecular Mass ◽  
Human Plasma ◽  
Tris Buffer ◽  
Plasma Samples ◽  
Internal Standards ◽  
Analytical Recovery ◽  
Proportional Decrease ◽  
Radioenzymatic Assays ◽  
Mass Component ◽  
Catecholamine Concentration

Abstract We investigated the effects of dilution of plasma samples on the measured concentrations of catecholamines. Diluting samples of human plasma 10-, 50-, and 100-fold with Tris buffer (100 mol/L, pH 8.6) improved analytical recovery of internal standards, suggesting that it decreases the commonly observed inhibition of methylation in radioenzymatic assays of catecholamines in plasma. However, the dilution is not associated with a proportional decrease in counted radioactivity. This extra amount of radioactivity, which is unlikely to be nonspecific in origin, accounts for a significant increase in the calculated catecholamine concentration. Tentatively, we suggest that Tris buffer releases both catecholamines and conjugated catecholamines bound to some unidentified low-molecular-mass component of plasma.

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