The dynamic differences between a living human brain and a clinically dead (fixed) human brain were measured over international Quantitative Electroencephalographic (QEEG) sites for 1 Hz increments between 1 Hz and 50...The dynamic differences between a living human brain and a clinically dead (fixed) human brain were measured over international Quantitative Electroencephalographic (QEEG) sites for 1 Hz increments between 1 Hz and 50 Hz. Although the expected greater power (μV2•Hz<sup>–</sup><sup>1</sup>) for the living brain was apparent, the difference was particularly obvious for theta and low beta bands. The integrated square root values over the entire band indicated the difference in intrinsic charge-based energy between the living (higher) and dead brain was ~2•10<sup>–</sup><sup>23</sup> J. This quantity is remarkably proximal to the Cosmic Background Microwave value and would be consistent with the Hameroff-Penrose definition of consciousness that suggests a permeating presence derived from discrete physical events. A power value obtained by multiplying this increment of energy by the frequency of the universal hydrogen line resulted in ~10<sup>–</sup><sup>12</sup> W•m<sup>–</sup><sup>2</sup> when applied to the surface area of the human cerebrum. This value is the median flux density that has been measured from human brains during cognition and defines the ultra-weak photon emissions displayed by cells, tissue, and organisms. These results suggest that modern technology may now be sufficiently precise to discern the critical parameters that differentiate the living brain from the fixed “dead” brain. This information might be useful for future designs of virtual consciousness and simulations within cerebral space.展开更多
The response of living tissue temperature to the external thermal perturbation can be regarded as a dynamic process. The authors introduced for the first time the thermal wave theory to study temperature oscillations ...The response of living tissue temperature to the external thermal perturbation can be regarded as a dynamic process. The authors introduced for the first time the thermal wave theory to study temperature oscillations in living tissue and described two approaches to obtaining an oscillation criterion. But the criterion obtained through the first method is in implicit form of thermal properties and inconvenient for quantitatively analyzing these properties’influence. The second method gives a clearer criterion but is over simplified. Liapnov’s stability analysis is adopted in the present note for the problem to obtain a criterion, which gives deeper insight into this phenomenon. Besides, a new dimensionless parameter W_τ with clear physical meaning is defined.展开更多
The data of dielectric properties of human tissues mainly come from animal tissues or human corpse at present. Up to now, there has not been a report of dielectric properties of human living liver. Our objective is to...The data of dielectric properties of human tissues mainly come from animal tissues or human corpse at present. Up to now, there has not been a report of dielectric properties of human living liver. Our objective is to study the dielectric properties of human living liver and compare the results with those of animal living liver as well as the human non-living liver. In vitro measurements of living and non-living livers from human and rabbits are shown in the 10 Hz to 100 MHz range. Analysis of the conductivity, permittivity and characteristic parameters from the data were made. The conductivity of three kinds of liver were markedly different at low frequency of 0.06 s/m (living rabbit liver), 0.13 s/m (living human liver) and 0.24 s/m (non-living human liver). The Cole parameters that best characterize the liver of human and rabbit are R0 , fc1 , R1 , and R∞ The Cole parameters that best characterize the living and nonliving liver of human are R0 , fc1 , ΔR1 , ΔR2 and R ∞ . In conclusion, we can't substitute the dielectric properties of animal or human corpse liver for the living human liver. The results suggest that the dielectric properties of living human tissues has great significance on studying.展开更多
A two-photon fluorescent probe TPZn was developed for specific ratiometric imaging Zn2＋ in living cells and tissues. Significant ratiometric fluorescence change was based on photoinduced electron transfer and intramo...A two-photon fluorescent probe TPZn was developed for specific ratiometric imaging Zn2＋ in living cells and tissues. Significant ratiometric fluorescence change was based on photoinduced electron transfer and intramolecular charge transfer. The synthetic method of TPZn was simple. It was successfully used to selectively image Zn2＋ based on the higher binding affinity for Zn2＋ than for Cd2＋. TPZn was easily loaded into the living cell and tissues with high membrane permeability in a complex biological environment. TPZn could clearly visualize endogenous Zn2＋ by TP ratiometric imaging in hippocampal slices at a depth of 120 μm. Thus, TPZn is a useful tool to image of Zn2＋ in living cells and tissues without interference from Cd2＋.展开更多
文摘The dynamic differences between a living human brain and a clinically dead (fixed) human brain were measured over international Quantitative Electroencephalographic (QEEG) sites for 1 Hz increments between 1 Hz and 50 Hz. Although the expected greater power (μV2•Hz<sup>–</sup><sup>1</sup>) for the living brain was apparent, the difference was particularly obvious for theta and low beta bands. The integrated square root values over the entire band indicated the difference in intrinsic charge-based energy between the living (higher) and dead brain was ~2•10<sup>–</sup><sup>23</sup> J. This quantity is remarkably proximal to the Cosmic Background Microwave value and would be consistent with the Hameroff-Penrose definition of consciousness that suggests a permeating presence derived from discrete physical events. A power value obtained by multiplying this increment of energy by the frequency of the universal hydrogen line resulted in ~10<sup>–</sup><sup>12</sup> W•m<sup>–</sup><sup>2</sup> when applied to the surface area of the human cerebrum. This value is the median flux density that has been measured from human brains during cognition and defines the ultra-weak photon emissions displayed by cells, tissue, and organisms. These results suggest that modern technology may now be sufficiently precise to discern the critical parameters that differentiate the living brain from the fixed “dead” brain. This information might be useful for future designs of virtual consciousness and simulations within cerebral space.
基金Project supported by the National Natural Science Foundation of China.
文摘The response of living tissue temperature to the external thermal perturbation can be regarded as a dynamic process. The authors introduced for the first time the thermal wave theory to study temperature oscillations in living tissue and described two approaches to obtaining an oscillation criterion. But the criterion obtained through the first method is in implicit form of thermal properties and inconvenient for quantitatively analyzing these properties’influence. The second method gives a clearer criterion but is over simplified. Liapnov’s stability analysis is adopted in the present note for the problem to obtain a criterion, which gives deeper insight into this phenomenon. Besides, a new dimensionless parameter W_τ with clear physical meaning is defined.
基金The National Natural Science Foundation of China grant number: 50937005 and 61071033
文摘The data of dielectric properties of human tissues mainly come from animal tissues or human corpse at present. Up to now, there has not been a report of dielectric properties of human living liver. Our objective is to study the dielectric properties of human living liver and compare the results with those of animal living liver as well as the human non-living liver. In vitro measurements of living and non-living livers from human and rabbits are shown in the 10 Hz to 100 MHz range. Analysis of the conductivity, permittivity and characteristic parameters from the data were made. The conductivity of three kinds of liver were markedly different at low frequency of 0.06 s/m (living rabbit liver), 0.13 s/m (living human liver) and 0.24 s/m (non-living human liver). The Cole parameters that best characterize the liver of human and rabbit are R0 , fc1 , R1 , and R∞ The Cole parameters that best characterize the living and nonliving liver of human are R0 , fc1 , ΔR1 , ΔR2 and R ∞ . In conclusion, we can't substitute the dielectric properties of animal or human corpse liver for the living human liver. The results suggest that the dielectric properties of living human tissues has great significance on studying.
基金supported by the Introduction Research Item of Northwest University for Nationalities(No.xbmuyjrc201110)the Fundamental Research Funds for the Central Universities(Nos.zyz2012062 and 31920130024)the Young and Middle-Aged Scientists Research Fund of Northwest University for Nationalities(No.12XB34)
文摘A two-photon fluorescent probe TPZn was developed for specific ratiometric imaging Zn2＋ in living cells and tissues. Significant ratiometric fluorescence change was based on photoinduced electron transfer and intramolecular charge transfer. The synthetic method of TPZn was simple. It was successfully used to selectively image Zn2＋ based on the higher binding affinity for Zn2＋ than for Cd2＋. TPZn was easily loaded into the living cell and tissues with high membrane permeability in a complex biological environment. TPZn could clearly visualize endogenous Zn2＋ by TP ratiometric imaging in hippocampal slices at a depth of 120 μm. Thus, TPZn is a useful tool to image of Zn2＋ in living cells and tissues without interference from Cd2＋.
