Steric Influences on Chain Microstructure in Palladium-Catalyzed α-Olefin (Co)polymerization: Unveiling the Steric-Deficient Effect.

This study addresses the challenge of controlling branching density and branch-type distribution in late-transition-metal-catalyzed chain walking polymerizations. We explored α-diimine Pd(II) complexes with incrementally increased -aryl sterics for long-chain α-olefin (co)polymerization. - catalysts, which feature gradually increased -aryl sterics and at least one small CH substituent, exhibited similar 2,1-insertion fractions (44-50%), polymer branching densities (55-63/1000C), and melting temperatures (26-28 °C).

Knowledge, attitudes, and practices among Chinese reproductive-age women toward uterine adenomyosis.

Objective: This study aimed to assess the knowledge, attitudes and practices (KAP) among Chinese reproductive-age women toward uterine adenomyosis.

Methods: This web-based cross-sectional study was conducted between April 2023 and September 2023 at the Second Hospital of Hebei Medical University. A self-designed questionnaire was developed to collect demographic information of reproductive-age women, and assess their KAP toward uterine adenomyosis.

Colorectal cancer tumor stem cells mediate bevacizumab resistance through the signal IL-22-STAT3 signaling pathway.

Bevacizumab is the standard treatment for colorectal cancer (CRC) in the advanced stage. However, poor diagnosis identified due to the bevacizumab resistance in many CRC patients. Previous studies have found that CRC stem cells (CCSCs) and interleukin 22 (IL-22) are involved in the resistance of bevacizumab, however, the mechanism of remains unclear.

Seminal vesicle metastasis after liver transplantation for hepatocellular carcinoma: A case report.

Rationale: Cancer recurrence and metastasis after liver transplantation (LT) is common in some hepatocellular carcinoma (HCC) patients. The most common sites of extrahepatic metastases are lung, regional lymph node, adrenal gland, and bone. To our knowledge, HCC metastasis to the seminal vesicle after LT has not been reported in the literature.

[The management of laryngotracheal defect derived from thyroid gland papillary carcinoma resection].

Objective: To investigate the preservation of the structure and function of the trachea and larynx, the management of laryngotracheal defect when trachea and larynx was involved.

Method: To review the management and clinical results of 13 cases of thyroid papillary carcinoma with larynx and trachea involvement, the preservation of laryngotracheal structure and relative defect reconstruction of our department from 2007-2014. Those patients being performed total laryngectomy was excluded.

[Priliminary study of pedicled sternocleidomastoid clavicular periosteocutaneous flap to repair the laryngotracheal defect].

Objective: To investigate the feasibility of utilizing pedicled sternocleidomastoid clavicular periosteocutaneous flap to reconstruct the laryngotracheal defect after tumor resection.

Method: To review 6 cases of laryngotracheal defect resulting from resction of thyroid papillary carcinoma(4/6) or subglottic laryngeal carcinoma (2/6) (T1~2N1~2M0 , UICC,2002), laryngotracheal stenting was also employed in all cases. Half a year after surgery, the stoma was sutured if no local recurrence took place and safety was proved after tracheal tube had been obstructed for days.

[Laryngo-tracheal flap to reconstruct the defect after resection of the hypopharyngeal carcinoma with cervical esophagus involvement].

Objective: To investigate cervical esophageal reconstruction by means of laryngo-tracheal flap after resection of hypopharyngeal carcinoma with cervical esophageal involvement.

Method: Eleven cases of hypopharyngeal carcinoma with cervical esophageal involvement. Unilateral piriform sinus and cervical esophagus were involved in 8 cases (8/11) while bilateral piriform sinus, posterior pharyngeal wall and cervical esophagus were involved in 3 cases.

Effect of postoperative fractionated radiotherapy on canine ePTFE graft neointima and anastomotic stoma healing: a preliminary experimental study.

Objective: The present study aimed to determine whether postoperative fractionated radiotherapy, at a total dose of 35 Gy, affected expanded polytetrafluoroethylene (ePTFE) graft anastomotic stoma healing and neointima formation.

Methods: The subrenal abdominal aortas of 20 mongrel dogs were replaced with an ePTFE graft. The dogs were randomly divided into either a radiotherapy or nonradiotherapy control group.