Peterssonals4776

Most pyridine-imine Ni(II) and Pd(II) catalysts tend to yield low-molecular-weight polyethylene and ethylene-based copolymers in olefin insertion polymerization, as the unilateral axial steric structure of such complexes often cannot provide effective shielding of the metal center. In this study, we synthesized a series of hybrid "semi-sandwich" and "sandwich" type pyridine-imine Ni(II) complexes by incorporating diarylmethyl or dibenzosuberyl groups onto 8-aryl-naphthyl motif. The as-prepared Ni(II) complexes afforded highly branched polyethylene with high molecular weights (level of 105 g/mol), and moderate activities (level of 105 g/(molh)) in ethylene polymerization. Most interestingly, compared to "semi-sandwich" Ni(II) complexes bearing (2-diarylmethyl-8-aryl)naphthyl units, the "full-sandwich" counterpart containing (2-dibenzosuberyl-8-aryl)naphthyl motif was able to produce higher-molecular-weight polyethylene with higher branching density. In addition, the effect of remote non-conjugated electronic substituents in diarylmethyl groups of the Ni(II) system was also observed in ethylene polymerization.Four selenoarsenates with different transition-metal complexes [Co(tren)2H]AsSe4 [tren = tris(2-aminoethyl)amine] (1); [Ni2(dien)4](As2Se5) (dien = diethylenetriamine) (2); [Zn(tren)]2(As2Se5) (3) and [Mn(tren)]2(As2Se5) (4) were solvothermally synthesized in a mixed solvent of organic amine and alcohol solution. The compounds 1-4 have pyramidal/tetrahedral structures (AsSe3/AsSe4), and contain transition metal (Co2+, Ni2+, Zn2+ and Mn2+) complex that form distinct zero-dimensional (0-D) clusters. Arsenic atoms form a tetrahedron in compounds 1 and 2; 1 consists of discrete tetrahedral (AsSe4) and transition metal complex [Co(tren)2]2+; 2 is composed of an anion [As2Se5]4- cluster and transition metal complex [Ni(dien)2]2+. In compounds 3 and 4, arsenic atom forms a pyramidal AsSe3 and the two pyramidal AsSe3 share a corner connection to form a dimer [As2Se5]4-; 3 is characterized as a cluster consisting of two unsaturated [Zn(tren)]2+ caiton linked by a dimer (As2Se5)4- linkage; in 4, unsaturated [Mn(tren)]2+ caiton is linked to two trigonal-bipyramidal [Mn(tren)]Se via dimer (As2Se5)4- to form [Mn(tren)]4[As4Se10] cluster. To our knowledge, [Zn(tren)]2(As2Se5) (3) is the first zinc selenoarsenate containing the (As2Se5)4- anion type. Furthermore, the Mn2+ ions adopt a trigonal-biyramidal (five-coordinate) and octahedral (six-coordinate) environment. Adding K2CO3/Cs2CO3 to the synthesis system is necessary and may act as a mineralizer. Several properties of compounds 1-4 have been characterized in our studies, in particular their strong photocurrent response characteristics under visible light irradiation.Ampyrone is an amino-functionalized heterocyclic pyrazolone derivative that possesses therapeutic values such as analgesic, anti-inflammatory, and antipyretics. The chemical structure of ampyrone exhibits excellent hydrogen bonding sites and is considered as the potential scaffold of supramolecular self-assembly. Recently, this molecule has been derived into unnatural amino acids such as aminopyrazolone amino acid and its peptides. This report describes that one of its amino acids, O-alkylated ampyrone, containing hybrid (α/β) peptides forms organogel after sonication at 50-55°C with 0.7-0.9% (w/v) in ethyl acetate hexane (13). The formation/morphology of such organogels is studied by nuclear magnetic resonance Fourier-transform infrared (FT-IR), circular dichroism (CD), scanning electron microscope (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (Powder-XRD), and thermogravimetric analysis (TGA). Energy-minimized conformation of APA-peptides reveals the possibility of intermolecular hydrogen bonding. Hence, APA-peptides are promising peptidomimetics for the organogel-peptides.

We sought to understand challenges and positive experiences of low-income families during the pandemic.

Strength-based perspectives of economically disadvantaged mothers are missing from literature on the impact of the COVID-19 pandemic. Although it is imperative to recognize disparities that were highlighted by the pandemic, strengths-based approaches and a resilience framework can help professionals build upon and learn from ways families manage during those times.

We used a mixed-method approach to gain understanding of the unique experiences of 15 low-income mothers at the height of the pandemic. We administered a brief COVID-19 stress screener, the Five-Minute Speech Sample measure, and an open-ended question about potential positive experiences during the pandemic.

We learned that strength and resilience supersede the liabilities brought on by COVID-19 that are so often focused on. We found highly divergent experiences across mothers in terms of stress; even mothers with high levels of stress readily identified positive aspects of life during the pandemic. Mothers' responses were indicative of greater feelings of warmth and tenderness than negativity about their children.

We discuss findings in terms of strengths-based practices and policies for mothers receiving public assistance and provide suggestions for continued research on resilience of mothers during the pandemic.

We discuss findings in terms of strengths-based practices and policies for mothers receiving public assistance and provide suggestions for continued research on resilience of mothers during the pandemic.

The aim was to assess the reported family relationships during the COVID-19 pandemic and the association between these relationships and individual, interpersonal, and country-level income in eight Middle East and North Africa (MENA) countries.

COVID-19 causes fear of infection, loss of loved ones, and economic problems that may affect family relationships.

Data were collected from eight MENA countries using an online survey (July-August 2020). The dependent variable was change in family relationship during COVID-19, and the independent variables were individual, interpersonal, and country-level factors represented by sociodemographic factors, COVID-19 status, financial impact (whether participants lost or had reduced wages) and country income. Multilevel logistic regression analysis was conducted.

There were 1854 responses, mean (

) age of 30.6 (9.9) years, 65.8% were female, 3.4% tested COVID-19 positive, and 20.8% reported lost/reduced wages. Family relationships were more likely to improve or remain unchanged (84.3%) for participants who had a history of COVID-19 (adjusted odds ratio [AOR]=3.54, 95% confidence interval [CI] [1.25, 10.01]). However, family relationships were more likely to not improve for those who knew someone who died of COVID-19 (AOR=0.76, 95% CI [0.58, 0.99]) and those with lost/reduced wages (AOR=0.69, 95% CI [0.52, 0.94]).

Family relationship improved or remained unchanged for those who tested positive for COVID-19 and did not improve for those who lost wages or lost someone due to COVID-19.

Policy makers should develop strategies to provide social and financial support to employees to reduce the losses and adverse social impact caused by the pandemic.

Policy makers should develop strategies to provide social and financial support to employees to reduce the losses and adverse social impact caused by the pandemic.

To support nonresident fathers in maintaining involvement and relationships with their children during the COVID-19 pandemic, we must understand how such fathers have been impacted thus far by the pandemic.

All families have been impacted by the pandemic, but fathers who do not reside with their children are particularly likely to be negatively impacted. Social distancing, restrictions on travel, job loss/economic downturn, family court closures, and numerous other effects of the COVID-19 crisis impact the ability of nonresident fathers to maintain relationships and involvement with their children.

The current study analyzed retrospective data from 373 nonresident U.S. LF3 price fathers to assess perceived parenting and coparenting changes during the pandemic, as well as whether coparenting relationships and mental health were associated with their involvement and relationships with their children.

On average, fathers' involvement, father-child relationship quality, and coparenting support declined, but wide variability also existed, with a substantial minority of fathers reporting increased involvement. Coparenting support was positively associated with current levels of involvement and relationship quality as well as changes to both since the pandemic, but mental health was inconsistently associated with outcomes.

To keep these average declines from becoming permanent, future research should investigate what factors foster higher involvement and improved relationships. Practitioners should offer additional support to nonresident fathers to promote their involvement and relationships in ways compatible with evolving restrictions.

To keep these average declines from becoming permanent, future research should investigate what factors foster higher involvement and improved relationships. Practitioners should offer additional support to nonresident fathers to promote their involvement and relationships in ways compatible with evolving restrictions.

This study aims to understand primary school students' behavior and awareness of sun exposure and sunscreen in Beijing, China.

A questionnaire survey was conducted of 232 students in grades 4-6 at a public primary school in Beijing, including 129 boys (55.6%) and 103 girls (44.4%). The contents of the questionnaire included awareness about ultraviolet rays, sun exposure, sunscreen habits, and the understanding and use of sunscreen.

The majority of the subjects (75.0%) said they had never been sunburned, and 26.3% had never been tanned. Only 7.3% of the primary school students had a comprehensive and correct understanding that sunlight will burn, cause cancer, tan, and age the skin. Sunscreen (47.8%), sunshades (47.4%), sun hats (44.4%), avoiding going out at noon (37.5%), and sunglasses (30.2%) were the most frequently used sunscreen means. Furthermore, 47.8% of primary school students used topical sunscreen for light protection, higher than other measures. The proportion of girls using sunscreen at least once a day was more than boys.

Primary school students in Beijing, China, do not have a comprehensive understanding of ultraviolet rays, and there are deficiencies in protective behavior. Their awareness and use of sunscreen need to be improved.

Primary school students in Beijing, China, do not have a comprehensive understanding of ultraviolet rays, and there are deficiencies in protective behavior. Their awareness and use of sunscreen need to be improved.

Squamous cell carcinoma (SCC) is a non-melanoma skin cancer, with a rising worldwide incidence. Wide excision with an intraoperative frozen section decreases its recurrence rate and metastases.

We reported an SCC case in a 50-year-old woman with clinical manifestations of a 4 × 6 × 0.3 cm solitary ulcer that easily bled. Dermoscopy and histopathological examination support the diagnosis of SCC. Due to its size, a wide excision was initiated, followed by a frozen section being carried out to determine the cancer cell-free margin. We performed an additional 1 cm margin excision as residual tumor still remained in the margin on the first excision. The forehead interpolation flap reconstruction was performed right after the excision to cover the extensive defects on the cheek, followed by a full-thickness skin graft (FTSG) for the forehead. The patient recovered well without complication within eight weeks post-procedure.

SCC with a diameter larger than 2 cm is considered as high-risk, and a wide excision is the standard treatment in this condition.