scholarly journals Hydrothermal Activities on C-Complex Asteroids Induced by Radioactivity

2022 ◽  
Vol 924 (1) ◽  
pp. L16
Author(s):  
Wataru Fujiya ◽  
Hisato Higashi ◽  
Yuki Hibiya ◽  
Shingo Sugawara ◽  
Akira Yamaguchi ◽  
...  
Keyword(s):  
Common Occurrence ◽  
Aqueous Alteration ◽  
Thermal Metamorphism ◽  
Hydroxyl Absorption ◽  
The Common ◽  
C Complex ◽  
Impact Heating ◽  
Hydrothermal Activities ◽  
High Temperature Polymorph ◽  
Asteroid Families

Abstract C-complex asteroids, rich in carbonaceous materials, are potential sources of Earth’s volatile inventories. They are spectrally dark resembling primitive carbonaceous meteorites, and thus, C-complex asteroids are thought to be potential parent bodies of carbonaceous meteorites. However, the substantial number of C-complex asteroids exhibits surface spectra with weaker hydroxyl absorption than water-rich carbonaceous meteorites. Rather, they best correspond to meteorites showing evidence for dehydration, commonly attributed to impact heating. Here, we report an old radiometric age of 4564.7 million years ago for Ca carbonates from the Jbilet Winselwan meteorite analogous to dehydrated C-complex asteroids. The carbonates are enclosed by a high-temperature polymorph of Ca sulfates, suggesting thermal metamorphism at >300°C subsequently after aqueous alteration. This old age indicates the early onset of aqueous alteration and subsequent thermal metamorphism driven by the decay of short-lived radionuclides rather than impact heating. The breakup of original asteroids internally heated by radioactivity should result in asteroid families predominantly consisting of thermally metamorphosed materials. This explains the common occurrence of dehydrated C-complex asteroids.

scholarly journals Subtype Characterization and Zoonotic Potential of Cryptosporidium felis in Cats in Guangdong and Shanghai, China

Pathogens ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 89
Author(s):  
Jiayu Li ◽  
Fuxian Yang ◽  
Ruobing Liang ◽  
Sheng Guo ◽  
Yaqiong Guo ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Phylogenetic Analysis ◽  
Genetic Characterization ◽  
Zoonotic Potential ◽  
Common Occurrence ◽  
High Genetic Diversity ◽  
Gp60 Gene ◽  
The Common ◽  
Subtyping Tool

Cryptosporidiumfelis is an important cause of feline and human cryptosporidiosis. However, the transmission of this pathogen between humans and cats remains controversial, partially due to a lack of genetic characterization of isolates from cats. The present study was conducted to examine the genetic diversity of C. felis in cats in China and to assess their potential zoonotic transmission. A newly developed subtyping tool based on a sequence analysis of the 60-kDa glycoprotein (gp60) gene was employed to identify the subtypes of 30 cat-derived C. felis isolates from Guangdong and Shanghai. Altogether, 20 C. felis isolates were successfully subtyped. The results of the sequence alignment showed a high genetic diversity, with 13 novel subtypes and 2 known subtypes of the XIXa subtype family being identified. The known subtypes were previously detected in humans, while some of the subtypes formed well-supported subclusters with human-derived subtypes from other countries in a phylogenetic analysis of the gp60 sequences. The results of this study confirmed the high genetic diversity of the XIXa subtype family of C. felis. The common occurrence of this subtype family in both humans and cats suggests that there could be cross-species transmission of C. felis.

The risk of aspiration in Dettol poisoning: a retrospective cohort study

1995 ◽  
Vol 14 (2) ◽  
pp. 190-191 ◽  
Author(s):  
Thomas Y.K. Chan ◽  
Julian A.J.H. Critchley ◽  
Joseph T.F. Lau
Keyword(s):  
Retrospective Cohort ◽  
Matched Control ◽  
Gastric Lavage ◽  
Common Occurrence ◽  
Pine Oil ◽  
Control Subjects ◽  
Increased Risk ◽  
The Common ◽  
Risk Of Aspiration ◽  
Increase In Risk

1 To determine if the risk of aspiration is increased in 'Dettol' (4.8% chloroxylenol, pine oil and isopropyl alco hol) poisoning and the factors that may be responsible, a study was made of 89 patients and 89 matched control subjects with other forms of poisoning admitted to the Prince of Wales Hospital, Hong Kong. 2 Aspiration was more common in patients with Dettol poisoning (8% vs 3%, P = 0.16). There were more control subjects with drowsiness at presentation (54% vs 24%, P < 0.0001), but the use of gastric lavage (88% vs 64%, P < 0.001) and the occurrence of vomiting (62% vs 17%, P < 0.0001) were more common in patients with Dettol poisoning. 3 Our findings suggest that Dettol poisoning may be asso ciated with an increased risk of aspiration. This increase in risk may be related to the use of gastric lavage and the common occurrence of vomiting in patients with Dettol poisoning.

DYNAMICS OF A2 FINGER PULLEY RUPTURE

2007 ◽  
Vol 07 (01) ◽  
pp. 75-87 ◽  
Author(s):  
MING A. TAN ◽  
FRANZ K. FUSS ◽  
GÜNTHER NIEGL
Keyword(s):  
Mechanical Properties ◽  
Mathematical Model ◽  
Initial Rate ◽  
Constant Force ◽  
Common Occurrence ◽  
Pulley System ◽  
Convergence Test ◽  
A2 Pulley ◽  
The Common ◽  
Rupture Mechanism

A mathematical model of the A2 pulley system will enable us to have a better understanding of the mechanics of the pulley-tendon system and provide us with insights of the pulley rupture mechanism. The A2 pulley was modeled based on parallel pulley fibers attached to a phalanx with a tendon passing them. Mechanical properties of the pulleys such as stiffness, strength and friction were included in the model. A convergence test was done to ensure the accuracy of the test. The model managed to show high loads on flexed finger may lead to pulley ruptures. Further studies on the rupture mechanism showed that pulley ruptures are self-propagating when a constant force is applied and the rate of rupture increases, as fewer intact fibers are present to support the load. The initial rate of propagation is much slower and this accelerates as more fibers are ruptured. This explains the common occurrence of partial pulley ruptures.

Burns first aid

2019 ◽  
pp. 59-66
Author(s):  
Jorge Leon-Villapolas
Keyword(s):  
Operative Management ◽  
First Aid ◽  
Burn Injuries ◽  
Tissue Preservation ◽  
Common Occurrence ◽  
Conflicting Information ◽  
History Of ◽  
The Common ◽  
The Uk ◽  
The Way

In the UK alone there are approximately 175,000 acute burn injuries /year. There is a great variation in the way these injuries are managed. Advances in our understanding of the pathophysiology and natural history of burn injuries have highlighted the importance of early intervention in minimizing later functional and cosmetic morbidity. Differences in beliefs and ethnic background have a large impact on the way that burns are initially dealt with, as we know that only a minority of patients presenting with burns are optimally managed pre-hospital. Lack of education and conflicting information about burns first aid is believed to be a major factor in the common occurrence of burnt patients presenting with a variety of domestic remedies being applied to their burns as first aid. Judicious application of simple burns first aid is the first step for soft tissue preservation, improvement of outcomes and a decrease in the need for operative management.

The common origin of family and non-family asteroids: Implications for meteorites and NEAs

2018 ◽  
Vol 14 (S345) ◽  
pp. 281-282
Author(s):  
Stanley F. Dermott ◽  
Dan Li ◽  
Apostolos A. Christou
Keyword(s):  
Hierarchical Clustering ◽  
Common Origin ◽  
Clustering Method ◽  
Main Belt ◽  
Frequency Distributions ◽  
Size Frequency ◽  
The Family ◽  
The Common ◽  
The Mean ◽  
Asteroid Families

AbstractThe observed size-frequency distributions (SFDs) of the five major asteroid families in the Inner Main Belt (IMB), defined by Nesvorný (2015) using the Hierarchical Clustering Method (Zappala et al. 1990), are distinctly different and deviate significantly from the linear log-log relation described by Dohnanyi (1969). The existence of these differences in the SFDs, and the fact that the precursor bodies of the major families have distinctly different eccentricities and inclinations, provides an explanation for the observations that the mean sizes of both the family and the non-family asteroids are correlated with their mean proper eccentricities and anti-correlated with their mean proper inclinations. We deduce from this, and from the fact that the SFDs of the family and the non-family asteroids are almost identical, that the family and most of the non-family asteroids in the IMB have a common origin (Dermott et al. 2018).

Examples of twinning and parallel growth in zircons from some Precambrian granites and gneisses

1974 ◽  
Vol 39 (305) ◽  
pp. 587-594 ◽  
Author(s):  
J. Jocelyn ◽  
R. T. Pidgeon
Keyword(s):  
Late Stage ◽  
Common Occurrence ◽  
Chemical Corrosion ◽  
Growth History ◽  
History Of ◽  
Growth Zones ◽  
The Common ◽  
Transverse Fractures ◽  
Parallel Growth

SummaryGrowth twins, parallel growths, and necked crystals are described from zircon populations from granitic gneisses from the Precambrian of SW. Greenland. From observations of the distribution of internal growth zones it is concluded that whereas twinning takes place early in the growth history of elbow twins it can occur at any time during crystallization of the zircon. Parallel growth is attributed to a process of synneusis or attachment of zircons that have initially undergone separate growth histories. This implies that viscosity conditions of the rocks were low enough to permit the movement and collision of growing zircon crystals. The common occurrence of zircons with central constrictions, sometimes superimposed on transverse fractures, in zircon suites from the granitic gneisses is explained in terms of late-stage chemical corrosion accompanied by brittle fracturing.

Dravite-bearing rocks from Dinas Head, Cornwall

1941 ◽  
Vol 26 (174) ◽  
pp. 81-93 ◽  
Author(s):  
S. O. Agrell
Keyword(s):  
Common Occurrence ◽  
Rock Types ◽  
The Common

In a previous paper describing the geological and petrographical details of the adinoles of Dinas Head, short references were made to the common occurrence among the adinoles and associated rock-types of the magnesia-rich tourmaline, dravite. It is proposed now to describe these tourmaline-rich rocks in more detail and to discuss the question of their origin.Adinoles with accessory tourmaline occur wherever true adinoles are developed at Dinas Head, although tourmaline is characteristically absent from types 2 a, b, c, and 3 [1, pp. 318–323]. Bands with up to 30 % tourmaline occur interbanded with normal adinoles of type 1 and with certain spilosites.

Leaf green-white variegation is advantageous under N deprivation in Pelargonium×hortorum

2015 ◽  
Vol 42 (6) ◽  
pp. 543 ◽  
Author(s):  
Cyril Abadie ◽  
Marlène Lamothe ◽  
Caroline Mauve ◽  
Françoise Gilard ◽  
Guillaume Tcherkez
Keyword(s):  
Surface Area ◽  
Photosynthetic Activity ◽  
Leaf Biomass ◽  
Common Occurrence ◽  
Plant Leaves ◽  
Experimental Conditions ◽  
Metabolic Analysis ◽  
Leaf Variegation ◽  
Green Areas ◽  
The Common

Variegation (patchy surface area with different colours) is a common trait of plant leaves. In green-white variegated leaves, two tissues with contrasted primary carbon metabolisms (autotrophic in green and heterotrophic in white tissues) are juxtaposed. It is generally believed that variegation is detrimental to growth due to the lower photosynthetic surface area. However, the common occurrence of leaf variegation in nature raises the question of a possible advantage under certain circumstances. Here, we examined growth and metabolism of variegated Pelargonium × hortorum L.H.Bailey using metabolomics techniques under N deprivation. Our results showed that variegated plants tolerate N deficiency much better, i.e. do not stop leaf biomass production after 9 weeks of N deprivation, even though the growth of green plants is eventually arrested and leaf senescence is triggered. Metabolic analysis indicates that white areas are naturally enriched in arginine, which decreases a lot upon N deprivation, probably to feed green areas. This process may compensate for the lower proteolysis enhancement in green areas and thus contribute to maintaining photosynthetic activity. We conclude that under our experimental conditions, leaf variegation was advantageous under prolonged N deprivation.

A description of the baculum of the bobcat (Felis rufus), with comments on its development and taxonomic implications

1984 ◽  
Vol 62 (6) ◽  
pp. 1172-1176 ◽  
Author(s):  
Renn Tumlison ◽  
V. Rick McDaniel
Keyword(s):  
Connective Tissue ◽  
Distal Portion ◽  
Proximal Region ◽  
Common Occurrence ◽  
Felis Rufus ◽  
Corpora Cavernosa ◽  
Vertical Septum ◽  
Taxonomic Implications ◽  
The Common ◽  
And Cartilage

Examination of the genitalia of male bobcats collected in Arkansas revealed the common occurrence of bacula. The preformed architecture of dense connective tissue and cartilage was evident in juveniles (<1 year). Observed morphological variation in adults was partially ascribed to ontogeny. Maximum dimensions observed were 7.6 mm (length) and 3.1 mm (width). The distal portion of the baculum is a narrow shaft, while the proximal region is expanded and bifurcated ventrally. A vertical septum separates two vacuities in the base of the baculum. These vacuities house the primarily adipose ends of the corpora cavernosa. Morphology of the baculum of the bobcat is similar to that of the European lynx, and, while different from other felids, it indicates validity of the genus Lynx.

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