The impact of infant carrying on adolescent mother–infant interactions during the still‐face task

2020 ◽  
Vol 29 (3) ◽  
Author(s):  
Lela Rankin Williams
Keyword(s):  
Adolescent Mother ◽  
Infant Carrying ◽  
The Impact ◽  
Face Task

Perceived Stress Moderates the Impact of Internalizing Symptoms on Family Functioning in Early Adolescence

2019 ◽  
Vol 40 (9) ◽  
pp. 1291-1317 ◽  
Author(s):  
Emily G. Simpson ◽  
Anna Vannucci ◽  
Courtney R. Lincoln ◽  
Christine McCauley Ohannessian
Keyword(s):  
Depressive Symptoms ◽  
Family Functioning ◽  
Perceived Stress ◽  
Internalizing Symptoms ◽  
Family Cohesion ◽  
High Stress ◽  
Adolescent Mother ◽  
Early Adolescent ◽  
School Students ◽  
The Impact

This study investigates the impact of early adolescent internalizing symptoms on family functioning for girls and boys, as moderated by perceived stress. Surveys were administered to 1,344 middle school students (11-14 years; 51% girls; 51% non-Hispanic White) in the fall of 2016 (T1) and 6 months later in the spring of 2017 (T2). For boys, depressive symptoms predicted less family conflict only among those with low stress. For girls, depressive symptoms predicted less adolescent-mother communication among those with low stress, but more communication among those with high stress. Also for girls, anxiety predicted more family cohesion in girls with low stress, but less cohesion among those with high stress. Finally, anxiety predicted less adolescent-father communication only among girls with low stress. Findings underscore the complex role that perceived stress plays when considering the impact of internalizing symptoms on family functioning in early adolescent girls and boys.

scholarly journals Oxytocin receptor binding in the titi monkey hippocampal formation is associated with parental status and partner affiliation

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Alexander Baxter ◽  
M. Anderson ◽  
A. M. Seelke ◽  
E. L. Kinnally ◽  
S. M. Freeman ◽  
...  
Keyword(s):  
Hippocampal Formation ◽  
Average Frequency ◽  
Postmortem Brain ◽  
Primate Species ◽  
Pair Bonding ◽  
Infant Carrying ◽  
Titi Monkey ◽  
Postmortem Brain Tissue ◽  
Titi Monkeys ◽  
The Impact

Abstract Social cognition is facilitated by oxytocin receptors (OXTR) in the hippocampus, a brain region that changes dynamically with pregnancy, parturition, and parenting experience. We investigated the impact of parenthood on hippocampal OXTR in male and female titi monkeys, a pair-bonding primate species that exhibits biparental care of offspring. We hypothesized that in postmortem brain tissue, OXTR binding in the hippocampal formation would differ between parents and non-parents, and that OXTR density would correlate with frequencies of observed parenting and affiliative behaviors between partners. Subjects were 10 adult titi monkeys. OXTR binding in the hippocampus (CA1, CA2/3, CA4, dentate gyrus, subiculum) and presubiculum layers (PSB1, PSB3) was determined using receptor autoradiography. The average frequency of partner affiliation (Proximity, Contact, and Tail Twining) and infant carrying were determined from longitudinal observations (5–6 per day). Analyses showed that parents exhibited higher OXTR binding than non-parents in PSB1 (t(8) = − 2.33, p = 0.048), and that OXTR binding in the total presubiculm correlated negatively with Proximity (r = − 0.88) and Contact (r = − 0.91), but not Tail Twining or infant carrying. These results suggest that OXTR binding in the presubiculum supports pair bonding and parenting behavior, potentially by mediating changes in hippocampal plasticity.

scholarly journals A descriptive study of the reasons and consequences of pregnancy among single adolescent mothers in Lesotho

Curationis ◽  
2007 ◽  
Vol 30 (3) ◽  
Author(s):  
E.M. Yako ◽  
J.M. Yako
Keyword(s):  
Adolescent Mothers ◽  
Health Workers ◽  
Unplanned Pregnancy ◽  
Unprotected Sex ◽  
Adolescent Mother ◽  
Early Childbearing ◽  
Sexually Transmitted ◽  
Unplanned Pregnancies ◽  
The Impact ◽  
Perceived Reasons

The adolescents, who engage in unprotected sex, face the risk of unplanned pregnancy and sexually transmitted diseases. It is not clear why adolescents in Lesotho engage in unprotected sex and end up with unplanned pregnancies. In addition, it is not clear what the consequences of early childbearing are on the life of the adolescent and her infant. An understanding of the reasons why a number of adolescents engage in unprotected sex and the impact of pregnancy and early childbearing on the lives of adolescent mothers and their infants will potentially assist nurses and other health workers in adolescent health promotion programmes. The purpose of this study was: 1) to determine the adolescent mother’s perceived reasons for pregnancy and 2) to determine pregnancy related joys, and problems faced by adolescent mother and her infant.

Formation of Lunar Craters and Bright Rays as a Result of Meteorite Impacts

1962 ◽  
Vol 14 ◽  
pp. 415-418
Author(s):  
K. P. Stanyukovich ◽  
V. A. Bronshten
Keyword(s):  
Explosive Charge ◽  
The Moon ◽  
Meteorite Impacts ◽  
The Earth ◽  
Lunar Craters ◽  
The Impact

The phenomena accompanying the impact of large meteorites on the surface of the Moon or of the Earth can be examined on the basis of the theory of explosive phenomena if we assume that, instead of an exploding meteorite moving inside the rock, we have an explosive charge (equivalent in energy), situated at a certain distance under the surface.

The Geosciences Applied to Lunar Exploration

1962 ◽  
Vol 14 ◽  
pp. 169-257 ◽  
Author(s):  
J. Green
Keyword(s):  
Lunar Surface ◽  
Probable Mechanism ◽  
Point Of View ◽  
Lunar Exploration ◽  
Geological Model ◽  
Apply Geophysics ◽  
Surface Features ◽  
The Impact

The term geo-sciences has been used here to include the disciplines geology, geophysics and geochemistry. However, in order to apply geophysics and geochemistry effectively one must begin with a geological model. Therefore, the science of geology should be used as the basis for lunar exploration. From an astronomical point of view, a lunar terrain heavily impacted with meteors appears the more reasonable; although from a geological standpoint, volcanism seems the more probable mechanism. A surface liberally marked with volcanic features has been advocated by such geologists as Bülow, Dana, Suess, von Wolff, Shaler, Spurr, and Kuno. In this paper, both the impact and volcanic hypotheses are considered in the application of the geo-sciences to manned lunar exploration. However, more emphasis is placed on the volcanic, or more correctly the defluidization, hypothesis to account for lunar surface features.

Asteroid and Comet Impact Speeds upon Mars: Significance for Panspermia and the Supply of Organics

1997 ◽  
Vol 161 ◽  
pp. 197-201 ◽  
Author(s):  
Duncan Steel
Keyword(s):  
Probability Distributions ◽  
Regions Of Interest ◽  
Significant Fraction ◽  
Organic Chemicals ◽  
Impact Speed ◽  
The Mean ◽  
The Impact

AbstractWhilst lithopanspermia depends upon massive impacts occurring at a speed above some limit, the intact delivery of organic chemicals or other volatiles to a planet requires the impact speed to be below some other limit such that a significant fraction of that material escapes destruction. Thus the two opposite ends of the impact speed distributions are the regions of interest in the bioastronomical context, whereas much modelling work on impacts delivers, or makes use of, only the mean speed. Here the probability distributions of impact speeds upon Mars are calculated for (i) the orbital distribution of known asteroids; and (ii) the expected distribution of near-parabolic cometary orbits. It is found that cometary impacts are far more likely to eject rocks from Mars (over 99 percent of the cometary impacts are at speeds above 20 km/sec, but at most 5 percent of the asteroidal impacts); paradoxically, the objects impacting at speeds low enough to make organic/volatile survival possible (the asteroids) are those which are depleted in such species.

Organic Syntheses During the Impact of a Comet with a Gaseous Planet

1997 ◽  
Vol 161 ◽  
pp. 189-195
Author(s):  
Cesare Guaita ◽  
Roberto Crippa ◽  
Federico Manzini
Keyword(s):  
Polymeric Material ◽  
Molecular Form ◽  
Parent Compound ◽  
Blue Filter ◽  
Organic Syntheses ◽  
The Impact

AbstractA large amount of CO has been detected above many SL9/Jupiter impacts. This gas was never detected before the collision. So, in our opinion, CO was released from a parent compound during the collision. We identify this compound as POM (polyoxymethylene), a formaldehyde (HCHO) polymer that, when suddenly heated, reformes monomeric HCHO. At temperatures higher than 1200°K HCHO cannot exist in molecular form and the most probable result of its decomposition is the formation of CO. At lower temperatures, HCHO can react with NH3 and/or HCN to form high UV-absorbing polymeric material. In our opinion, this kind of material has also to be taken in to account to explain the complex evolution of some SL9 impacts that we observed in CCD images taken with a blue filter.

Hydrogen Cyanide Polymers from the Impact of Comet P/Shoemaker-Levy 9 on Jupiter

1997 ◽  
Vol 161 ◽  
pp. 179-187
Author(s):  
Clifford N. Matthews ◽  
Rose A. Pesce-Rodriguez ◽  
Shirley A. Liebman
Keyword(s):  
Amino Acids ◽  
Solar System ◽  
Hydrogen Cyanide ◽  
Nitrogen Heterocycles ◽  
Laboratory Studies ◽  
Heterogeneous Solids ◽  
The Many ◽  
Comet Halley ◽  
The Impact ◽  
By Products

AbstractHydrogen cyanide polymers – heterogeneous solids ranging in color from yellow to orange to brown to black – may be among the organic macromolecules most readily formed within the Solar System. The non-volatile black crust of comet Halley, for example, as well as the extensive orangebrown streaks in the atmosphere of Jupiter, might consist largely of such polymers synthesized from HCN formed by photolysis of methane and ammonia, the color observed depending on the concentration of HCN involved. Laboratory studies of these ubiquitous compounds point to the presence of polyamidine structures synthesized directly from hydrogen cyanide. These would be converted by water to polypeptides which can be further hydrolyzed to α-amino acids. Black polymers and multimers with conjugated ladder structures derived from HCN could also be formed and might well be the source of the many nitrogen heterocycles, adenine included, observed after pyrolysis. The dark brown color arising from the impacts of comet P/Shoemaker-Levy 9 on Jupiter might therefore be mainly caused by the presence of HCN polymers, whether originally present, deposited by the impactor or synthesized directly from HCN. Spectroscopic detection of these predicted macromolecules and their hydrolytic and pyrolytic by-products would strengthen significantly the hypothesis that cyanide polymerization is a preferred pathway for prebiotic and extraterrestrial chemistry.

Unusual Microstructure in Shock-Compacted Graphite

1970 ◽  
Vol 28 ◽  
pp. 474-475
Author(s):  
Lucien F. Trueb
Keyword(s):  
Mechanical Characteristic ◽  
Compression Wave ◽  
Gray Zone ◽  
Flyer Plate ◽  
Compacted Graphite ◽  
The Impact

Crushed and statically compressed Madagascar graphite that was explosively shocked at 425 kb by means of a planar flyer-plate is characterized by a black zone extending for 2 to 3 nun below the impact plane of the driver. Beyond this point, the material assumes the normal gray color of graphite. The thickness of the black zone is identical with the distance taken by the relaxation wave to overtake the compression wave.The main mechanical characteristic of the black material is its great hardness; steel scalpels and razor blades are readily blunted during attempts to cut it. An average microhardness value of 95-3 DPHN was obtained with a 10 kg load. This figure is a minimum because the indentations were usually cracked; 14.8 DPHN was measured in the gray zone.

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