This paper aims at providing a scientific basis for unifying the normal reference value standards of red blood cell count of Chinese presenile men. The paper, using microscopical counting method, studies the relations...This paper aims at providing a scientific basis for unifying the normal reference value standards of red blood cell count of Chinese presenile men. The paper, using microscopical counting method, studies the relationship between the normal reference values of 38,061 samples of red blood cell count of presenile men and eight geographical factors in 297 units in China. It is found that the correlation of geographical factors and the normal reference value of red blood cell count of presenile men is quite significant (F=303.00, P=0.000). By using the method of stepwise regression analysis, one regression equation is inferred. It is concluded that if geographical data are obtained in a certain area, the normal reference value of red blood cell count of presenile men in this area can be reckoned by using the regression analysis. Furthermore, according to the geographical factors, China can be divided into eight regions: Northeast China Region, North China Region, Shanxi-Shaanxi-Inner Mongolia Region, Middle and Lower Reaches of the Changjiang River Region, Southeast China Region, Northwest China Region, Southwest China Region and Qinghai-Tibet Plateau Region.展开更多
Numerical simulations are performed to examine the packing behavior of human red blood cells(RBCs). A combined ?nite-discrete element method(FDEM) is utilized, in which the RBCs are modeled as no-friction and no-adhes...Numerical simulations are performed to examine the packing behavior of human red blood cells(RBCs). A combined ?nite-discrete element method(FDEM) is utilized, in which the RBCs are modeled as no-friction and no-adhesion solid bodies. The packed volume and the void ratio of a large number of randomly packed RBCs are clari?ed,and the effects of the RBC shape, the mesh size, the cell number, and the container size are investigated. The results show that the packed human RBCs with normal shape have a void ratio of 28.45%, which is slightly higher than that of the ?at or thick cells used in this study. Such information is bene?cial to the further understanding on the geometric features of human RBCs and the research on RBC simulations.展开更多
Human red blood cells (RBCs) are responsible to transport oxygen and carbon dioxide for human bodies. The physiological functions of RBCs are greatly influenced by their mechanical properties. When RBC is infected by ...Human red blood cells (RBCs) are responsible to transport oxygen and carbon dioxide for human bodies. The physiological functions of RBCs are greatly influenced by their mechanical properties. When RBC is infected by Malaria parasite called Plasmodium falciparum, it shows progressive changes in mechanical properties and loses its deformability. The infected red blood cells (IRBCs) develop properties of cytoadherence (stickiness) and rosetting (the binding of non-infected RBCs to parasitized RBCs). In this paper to analyze the mechanical properties and deformability of the IRBC, we applied stress-stretch ratio relation of its biomembrane .To express this constitutive relation, we proposed a mathematical model (Neo-Hookean model) based on membrane theory. On this model, we present continuous stress-stretch ratio curves for the relation derived from the model for different intracellular developmental stages of the parasite, to determine the mechanical properties of IRBC. The analytical results obtained from the mathematical model are more closed with the experimental data [1] which demonstrates the validity of the model. By restricting our attention to spherically symmetric deformation in the final schizont stage of parasite development, the pressure-extension ratio relation curve also adapted from the proposed strain energy function. The change in osmotic pressure versus volumetric ratio has been also considered for IRBC before hemolysis.展开更多
目的分析食管胃结合部腺癌(adenocarcinoma of the esophagogastric junction,AEJ)患者不同Siewert分型中RBC、NLR及临床特征。方法采用回顾性分析方法收集延安大学附属医院2017年1月1日至2018年12月31日消化内科及胃肠外科进行手术治疗...目的分析食管胃结合部腺癌(adenocarcinoma of the esophagogastric junction,AEJ)患者不同Siewert分型中RBC、NLR及临床特征。方法采用回顾性分析方法收集延安大学附属医院2017年1月1日至2018年12月31日消化内科及胃肠外科进行手术治疗的55例AEJ患者的临床病理资料,分析AEJ患者不同Siewert分型中各项指标及临床特征的变化。结果在不同Siewert分型中,RBC、NLR、肿瘤大小、淋巴结转移比较,差异有统计学意义(P<0.05)。对RBC、NLR、肿瘤大小、淋巴结转移分别进行组内两两比较,发现SiewertⅢ型中RBC值高于SiewertⅡ型,且差异有统计学意义(P<0.05);SiewertⅢ型中NLR值低于SiewertⅡ型,差异有统计学意义(P<0.05);从SiewertⅠ型到SiewertⅢ型,肿瘤的长径逐渐增大且3种Siewert分型相互之间两两比较,差异均有统计学意义(P<0.05);SiewertⅠ型到SiewertⅢ型淋巴结转移率越来越大,差异有统计学意义(P<0.05)。结论不同Siewert分型的AEJ患者具有不同的临床病理特征,SiewertⅢ型与SiewertⅡ型相比RBC水平较高,而NLR却较低;相比于另外两型,SiewertⅢ型肿瘤可能相对较大,淋巴结转移率相对较高,生物学行为可能较差。展开更多
The changes of blood perfusion and oxygen transport in tumors during tumor vascular normalization are studied with 3-dimensional mathematical modeling and numerical simulation. The models of tumor angiogenesis and vas...The changes of blood perfusion and oxygen transport in tumors during tumor vascular normalization are studied with 3-dimensional mathematical modeling and numerical simulation. The models of tumor angiogenesis and vascular-disrupting are used to simulate ＂un-normalized＂ and ＂normalized＂ vasculatures. A new model combining tumor hemodynamics and oxygen transport is developed. In this model, the intravasculartransvascular-interstitial flow with red blood cell（RBC） delivery is tightly coupled, and the oxygen resource is produced by heterogeneous distribution of hematocrit from the flow simulation. The results show that both tumor blood perfusion and hematocrit in the vessels increase, and the hypoxia microenvironment in the tumor center is greatly improved during vascular normalization. The total oxygen content inside the tumor tissue increases by about 67%, 51%, and 95% for the three approaches of vascular normalization,respectively. The elevation of oxygen concentration in tumors can improve its metabolic environment, and consequently reduce malignancy of tumor cells. It can also enhance radiation and chemotherapeutics to tumors.展开更多
基金Under the auspices of the National Natural Science Foundation of China (No. 40371004)
文摘This paper aims at providing a scientific basis for unifying the normal reference value standards of red blood cell count of Chinese presenile men. The paper, using microscopical counting method, studies the relationship between the normal reference values of 38,061 samples of red blood cell count of presenile men and eight geographical factors in 297 units in China. It is found that the correlation of geographical factors and the normal reference value of red blood cell count of presenile men is quite significant (F=303.00, P=0.000). By using the method of stepwise regression analysis, one regression equation is inferred. It is concluded that if geographical data are obtained in a certain area, the normal reference value of red blood cell count of presenile men in this area can be reckoned by using the regression analysis. Furthermore, according to the geographical factors, China can be divided into eight regions: Northeast China Region, North China Region, Shanxi-Shaanxi-Inner Mongolia Region, Middle and Lower Reaches of the Changjiang River Region, Southeast China Region, Northwest China Region, Southwest China Region and Qinghai-Tibet Plateau Region.
基金Project supported by the Engineering and Physical Sciences Research Council(EPSRC)Turbulence Consortium Grant(No.EP/G069581/1)the Marie Curie International Incoming Fellowship(No.PIIF-GA-253453)
文摘Numerical simulations are performed to examine the packing behavior of human red blood cells(RBCs). A combined ?nite-discrete element method(FDEM) is utilized, in which the RBCs are modeled as no-friction and no-adhesion solid bodies. The packed volume and the void ratio of a large number of randomly packed RBCs are clari?ed,and the effects of the RBC shape, the mesh size, the cell number, and the container size are investigated. The results show that the packed human RBCs with normal shape have a void ratio of 28.45%, which is slightly higher than that of the ?at or thick cells used in this study. Such information is bene?cial to the further understanding on the geometric features of human RBCs and the research on RBC simulations.
文摘Human red blood cells (RBCs) are responsible to transport oxygen and carbon dioxide for human bodies. The physiological functions of RBCs are greatly influenced by their mechanical properties. When RBC is infected by Malaria parasite called Plasmodium falciparum, it shows progressive changes in mechanical properties and loses its deformability. The infected red blood cells (IRBCs) develop properties of cytoadherence (stickiness) and rosetting (the binding of non-infected RBCs to parasitized RBCs). In this paper to analyze the mechanical properties and deformability of the IRBC, we applied stress-stretch ratio relation of its biomembrane .To express this constitutive relation, we proposed a mathematical model (Neo-Hookean model) based on membrane theory. On this model, we present continuous stress-stretch ratio curves for the relation derived from the model for different intracellular developmental stages of the parasite, to determine the mechanical properties of IRBC. The analytical results obtained from the mathematical model are more closed with the experimental data [1] which demonstrates the validity of the model. By restricting our attention to spherically symmetric deformation in the final schizont stage of parasite development, the pressure-extension ratio relation curve also adapted from the proposed strain energy function. The change in osmotic pressure versus volumetric ratio has been also considered for IRBC before hemolysis.
文摘目的分析食管胃结合部腺癌(adenocarcinoma of the esophagogastric junction,AEJ)患者不同Siewert分型中RBC、NLR及临床特征。方法采用回顾性分析方法收集延安大学附属医院2017年1月1日至2018年12月31日消化内科及胃肠外科进行手术治疗的55例AEJ患者的临床病理资料,分析AEJ患者不同Siewert分型中各项指标及临床特征的变化。结果在不同Siewert分型中,RBC、NLR、肿瘤大小、淋巴结转移比较,差异有统计学意义(P<0.05)。对RBC、NLR、肿瘤大小、淋巴结转移分别进行组内两两比较,发现SiewertⅢ型中RBC值高于SiewertⅡ型,且差异有统计学意义(P<0.05);SiewertⅢ型中NLR值低于SiewertⅡ型,差异有统计学意义(P<0.05);从SiewertⅠ型到SiewertⅢ型,肿瘤的长径逐渐增大且3种Siewert分型相互之间两两比较,差异均有统计学意义(P<0.05);SiewertⅠ型到SiewertⅢ型淋巴结转移率越来越大,差异有统计学意义(P<0.05)。结论不同Siewert分型的AEJ患者具有不同的临床病理特征,SiewertⅢ型与SiewertⅡ型相比RBC水平较高,而NLR却较低;相比于另外两型,SiewertⅢ型肿瘤可能相对较大,淋巴结转移率相对较高,生物学行为可能较差。
基金Project supported by the National Natural Science Foundation of China(Nos.11102113 and81301816)the New Teachers Start Program of Shanghai Jiao Tong University+1 种基金the Chenxing Young Scholars Program B of Shanghai Jiao Tong University(No.13X100010070)the Natural Science Research Foundation of Shanghai Jiao Tong University School of Medicine(No.13XJ10037)
文摘The changes of blood perfusion and oxygen transport in tumors during tumor vascular normalization are studied with 3-dimensional mathematical modeling and numerical simulation. The models of tumor angiogenesis and vascular-disrupting are used to simulate ＂un-normalized＂ and ＂normalized＂ vasculatures. A new model combining tumor hemodynamics and oxygen transport is developed. In this model, the intravasculartransvascular-interstitial flow with red blood cell（RBC） delivery is tightly coupled, and the oxygen resource is produced by heterogeneous distribution of hematocrit from the flow simulation. The results show that both tumor blood perfusion and hematocrit in the vessels increase, and the hypoxia microenvironment in the tumor center is greatly improved during vascular normalization. The total oxygen content inside the tumor tissue increases by about 67%, 51%, and 95% for the three approaches of vascular normalization,respectively. The elevation of oxygen concentration in tumors can improve its metabolic environment, and consequently reduce malignancy of tumor cells. It can also enhance radiation and chemotherapeutics to tumors.
