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Prediction of blood cell flow is known as the difficult research by reason of the complexity of blood vessel. In this study, considering the complex structure of blood vessels, a mechanical model for red blood cell (RBC) based on unstructured grid has been established to study the flow characteristics of RBCs in complex blood vessels. In the model, the strain‐energy function by Skalak is employed to model the shear elasticity and surface‐area conservation of the membrane, and the hinge spring is used to describe the forces originating from local bending of the membrane. The immersed boundary method is utilized to couple the interphase force. Using the model, the stretching test of RBC is compared with the experiment data, and the good agreement verified the validation of the present model. The morphology of red blood cell and the blood viscosity in micro‐vessel are studied. RBCs move with a symmetric shape (parachute shape) in small blood vessels, and the buckling instability is observed when the RBC flow slowly through a micro‐vessel or a converging–diverging capillary. When the vessel diameter is around 10 μm, the reverse Fahraeus‐Lindqvist effect is presented. The blood apparent viscosity shows linear increase with the blood hematocrit. In addition, Malaria infection can make the RBC deformability decreased and the blood apparent viscosity increased. [ABSTRACT FROM AUTHOR]

Two Co(II)-based coordination polymers (CPs) with the molecular formulae of [Co4(5-mtz)4(l-mal)2(H2O)2]n (1, 5-mtz = 5-methyltetrazole, L-mal = L-malic acid) and {[Co8(S-mal)4(bptc)(H2O)12]·0.5H4bptc·7.5H2O}n (2, S-mal = S-malic acid, H4bptc = biphenyl-3,3′,5,5′-tetracarboxylic acid) were synthesized under a hydrothermal or solvothermal surrounding. The prepared two complexes have been determined through the powder and single crystal X-ray diffraction, thermogravimetric (TG) analyses and IR spectroscopy. To prevent the hypotension during surgery after injected with anesthetic, their biological activity was estimated in this research. The CCK-8 (Cell Counting Kit-8) assay was performed to measure the viability of the HUVEC cells after compounds treatment. The relative expression of the α receptor was evaluated by real time RT-PCR (reverse transcription-polymerase chain reaction). Besides, the blood pressure was measured as well. [ABSTRACT FROM AUTHOR]

The article titled "Structural Diversity of Co(II) Coordination Polymers: Treatment Activity on Hypotension during Surgery by Blocking α Receptor on Peripheral Blood Vessels" has been retracted by the Editor-in-Chief and the Publisher of the Journal of Cluster Science. The retraction was prompted by evidence of systematic manipulation of the publication process, including issues with citations, phrasing, figures, and ethics approval statements. The authors have not responded to correspondence regarding the retraction. Springer Nature, the publisher, remains neutral in regards to jurisdictional claims and institutional affiliations. [Extracted from the article]