Direct Synthesis of Partially Chain-Straightened Propylene Oligomers and P-MA Co-Oligomers Using Axially Flexible Shielded Iminopyridyl Palladium Complexes.

In this study, a series of partially chain-straightened propylene oligomers and functional propylene−methyl acrylate (P-MA) co-oligomers were synthesized with 8-alkyl-iminopyridyl Pd(II) catalysts. The molecular weight and polar monomer incorporation ratio could be tuned by using Pd(II) catalysts with various 8-alkyl-naphthyl substituents (8-alkyl: H, Me, and n-Bu). In propylene oligomerization, all the 8-alkyl-iminopyridyl Pd(II) catalysts convert propylene to partially chain-straightened (119−136/1000 C) oligomers with low molecular weights (0.

Facile Synthesis of Hyperbranched Ethylene Oligomers and Ethylene/Methyl Acrylate Co-oligomers with Different Microscopic Chain Architectures.

Low-molecular-weight (MW) ethylene oligomers with hyperbranched microstructures are often difficult to be synthesized by traditional catalytic processes. In this study, a series of -terphenyl iminopyridyl ligands and the corresponding Pd(II) and Ni(II) complexes bearing remote conjugated substituents with different electronic effects (H, Me, F, Cl, and Bu) were synthesized in a simple and efficient way. These Pd(II) and Ni(II) complexes were highly effective in the ethylene oligomerization and co-oligomerization with methyl acrylate (MA).

DNA Ligase Connects Two Fragments Having Exceptionally Short Complementary Termini at High Temperatures.

DNA ligase ( DNA ligase) is widely employed for cloning, enzymatic synthesis, and molecular diagnostics at high temperatures (e.g., 65 °C).

Transvaginal three-dimensional ultrasound combined with HD flow model for uterus scar diverticulum.

To study the influencing factors of scar diverticulum formation and its monitoring methods, 141 people with a history of cesarean section and kidney deficiency and blood stasis were selected as subjects. The transvaginal ultrasound technique was used to divide the case into the scar diverticulum case group and the complete group, and the clinical situation was analyzed. Transvaginal three-dimensional ultrasound combined with HD flow pattern was used to analyze the morphology of uterus scar diverticulum and the parameters of peripheral muscle blood flow.

Role of Ultrasound in the Detection of Rotator-Cuff Syndrome: An Observational Study.

BACKGROUND Physical tests are usually preferred to assess rotator-cuff syndrome but are insufficient to predict the morphology and size of the rotator-cuff. The objective of the study was to rate the ultrasound findings for patients with sudden shoulder pain and to determine potential predictors of the same. MATERIAL AND METHODS A total of 112 patients with sudden shoulder pain with rotator-cuff syndrome, suspected by orthopedic doctors, were subjected to ultrasonography.

Effects of secondary structures of DNA templates on the quantification of qPCR.

In the current design of quantitative polymerase chain reaction (qPCR) systems, the sequences of primers are the primary concerns. The secondary structures of DNA templates have not been much considered, although they should be also critically important. In this paper, various hairpins with different stem lengths and loop sizes are placed near primer-binding sites, and their effects on the amplification efficiency of qPCR are systematically investigated.

The influence of NHCs on C-Si and C-C reductive elimination: a computational study of the selectivity of Ni-catalyzed C-H activation of arenes with vinylsilanes.

Density functional theory calculations were performed to investigate the mechanism and origins of the NHC-controlled selectivity of Ni-catalyzed C-H activation of arenes with vinylsilanes. The key to the selectivity is the different impacts of NHCs on the C-Si/C-C reductive elimination of the square-planar/T-shaped intermediate.

[Clinical application of tibial composite saphenous nervetissue flap for the treatment of traumatic bone-skin defect of leg].

Objective: To investigate the effect of tibial composite saphenous nerve tissue flap in repairing traumatic bone-skin defect of leg.

Methods: From February 2009 to May 2015, 23 patients with focile skin defect caused by trauma were treated, including 18 males and 5 females, aged from 8 to 59 years old with an average age of 35.6 years old.

Ultrasound reverses chemoresistance in breast cancer stem cell like cells by altering ABCG2 expression.

Doxorubicin (DOX) resistance in breast cancer largely results from the breast cancer stem cell like cells (BCSCs) which could be targetted to improve the efficacy of chemotherapy. Cell permeabilization using microbubbles (MBs) and ultrasound (US) have the potential for delivering molecules into the cytoplasm. We aim to evaluate a new methodology of US on BCSCs.

Efficacy of patients' preferred exercise modalities in chronic obstructive pulmonary disease: A parallel-group, randomized, clinical trial.

Introduction: Physical exercise effectively improves health-related quality of life in patients with chronic obstructive pulmonary disease (COPD). However, application of this medical intervention is problematic, due to poor adherence to the exercise program or unawareness of the significance of this intervention.

Objective: To determine whether COPD patients who adopted personal-preferred exercise modalities (PPEMs) for daily training would demonstrate sustained benefits due to improved adherence.

The effects of eye drops on corneal thickness in adult myopia.

Purpose: To study the effects of Complex Tropicamide (0.5% Tropicamide and 0.5% phenylephrine HCI) and Saline solution on corneal thickness in adult myopic patients with the Orbscan II system.