Biophysics最新文献_第9页

A Thermodynamic Model of the Formation of Protein Aggregates on a Matrix 基质上蛋白质聚集体形成的热力学模型

IF 4.033

Biophysics Pub Date : 2024-03-18 DOI: 10.1134/S0006350923060210

E. O. Vasilenko, S. A. Kozin, V. A. Mitkevich, A. S. Buchelnikov, Yu. D. Nechipurenko

引用次数: 0

Lipase and Esterase Activity in Soils from Ancient Burial Vessels 古代墓葬土壤中的脂肪酶和酯酶活性

IF 4.033

Biophysics Pub Date : 2024-03-18 DOI: 10.1134/S000635092306009X

N. N. Kashirskaya, E. V. Chernysheva, S. N. Udaltsov, L. N. Plekhanova

{"title":"Lipase and Esterase Activity in Soils from Ancient Burial Vessels","authors":"N. N. Kashirskaya, E. V. Chernysheva, S. N. Udaltsov, L. N. Plekhanova","doi":"10.1134/S000635092306009X","DOIUrl":"10.1134/S000635092306009X","url":null,"abstract":"The activity of lipolytic enzymes was evaluated by the microplate method using heteromolecular exchange in soils from the bottom of the burial ware, followed by cluster analysis. Groups with a contrasting ratio of C12–C18 lipases and C4–C8 esterases were identified in a sample including 57 burial pots aged 2000 to 3000 years. The total lipolytic activity of soil samples from ware with an estimated initial presence of fat-containing funeral food products was above 6% of the maximum value within the sample. The inhibition of esterases in the presence of high concentrations of fatty acids was reflected in extremely low relative esterase activity of the soil microbial community at maximum C18 and C12 lipase activity in two groups of pots. In three groups, esterase activity was observed at high relative activity of C16 lipases, average relative activity of C18 lipases, and extremely low activity of true lipases. In the group of pots with high total lipolytic activity (with the exception of certain extreme values of this indicator), the proportion of true lipase activity was 1.7–1.8 times higher than the proportion of esterase activity. The grouping of funeral dishes according to the ratio of lipase and esterase activity reflected the characteristics of funeral food, whereas the absolute values of enzyme activity among selected vessels with the highest total lipolytic activity were grouped according to the type of burial.","PeriodicalId":493,"journal":{"name":"Biophysics","volume":"68 6","pages":"996 - 1003"},"PeriodicalIF":4.033,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140172669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of the Relationship between Activity of the Reticular Formation of the Medulla Oblongata and the Respiratory and Cardiovascular Systems in Rats under Painful Stimulation 疼痛刺激下大鼠延髓网状结构的活动与呼吸系统和心血管系统的关系分析

IF 4.033

Biophysics Pub Date : 2024-03-18 DOI: 10.1134/S0006350923060064

O. E. Dick

引用次数: 0

The Pathway of Amyloid Aggregation of Titin Titin 的淀粉样蛋白聚集途径

IF 4.033

Biophysics Pub Date : 2024-03-18 DOI: 10.1134/S0006350923060039

L. G. Bobyleva, T. A. Uryupina, M. A. Timchenko, S. N. Udaltsov, I. M. Vikhlyantsev, A. G. Bobylev

引用次数: 0

Simulation of Fluorescence Spectrum Related to Photosynthesis 模拟与光合作用有关的荧光光谱

IF 4.033

Biophysics Pub Date : 2024-03-18 DOI: 10.1134/S0006350923060222

S. I. Zienko, V. L. Zhbanova

{"title":"Simulation of Fluorescence Spectrum Related to Photosynthesis","authors":"S. I. Zienko, V. L. Zhbanova","doi":"10.1134/S0006350923060222","DOIUrl":"10.1134/S0006350923060222","url":null,"abstract":"A mathematical study of fluorescence spectrum related to photosynthesis action spectrum was carried out, the calculation of typical photosynthesis spectra on the frequency scale for red and blue light was performed, and the transition of the photosynthesis action spectrum from wavelengths to the frequency scale was carried out; as a result of the inverse Fourier transform, a relaxation curve of the pulse (time) characteristic of fluorescence was numerically obtained. It turned out that the radius vector of the pulse response modulus in polar coordinates made one half turn or half the period of light oscillations in time. It has been found that the optical medium of a plant has a negative volume charge of electrons during relaxation and has inverse properties and properties of coherent radiation. The condition of neutrality of the material environment is not fulfilled. It was revealed that the ratios of variable chlorophyll fluorescence for red and blue light have almost the same value. An analysis of the dependence of the quality factor of the chlorophyll spectrum on frequency showed that the loss of fluorescence energy in blue light significantly exceeds the loss of energy in red light. The proposed method can be used for rapid analysis of photosynthesis intensity. It is also concluded that plants can emit ultra-wideband signals. The relaxation time of chlorophyll fluorescence is shorter than the relaxation time of electron polarization in atoms (molecules). As a result, an inversion of populations is created in the optical medium of chlorophyll, that is, there are more atoms at the upper energy level than at the lower one. Due to this, forced emission and amplification of the light of radiative recombination occurs. In this case, the emission of fluorescence light becomes coherent. All these properties of plants were considered for the first time and were not described in either the domestic or foreign literature.","PeriodicalId":493,"journal":{"name":"Biophysics","volume":"68 6","pages":"964 - 970"},"PeriodicalIF":4.033,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140172480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Method of Short-Term Forecasting of Ultradian and Infradian Rhythms Based on the Recording of Fluctuations in the Rates of Radioactive Decay of Potassium-40 基于钾-40 放射性衰变率波动记录的超昼夜节律和无昼夜节律短期预测方法

IF 4.033

Biophysics Pub Date : 2024-03-18 DOI: 10.1134/S0006350923060052

M. E. Diatroptov, M. A. Diatroptova, S. M. Slesarev

{"title":"A Method of Short-Term Forecasting of Ultradian and Infradian Rhythms Based on the Recording of Fluctuations in the Rates of Radioactive Decay of Potassium-40","authors":"M. E. Diatroptov, M. A. Diatroptova, S. M. Slesarev","doi":"10.1134/S0006350923060052","DOIUrl":"10.1134/S0006350923060052","url":null,"abstract":"Simultaneous observations of radioactivity fluctuations from the natural isotope 40K were carried out in Moscow and Ulyanovsk. It was found that the changes in the counting rate from sources in these geographical points were not simultaneous, but were synchronized according to local solar time. Based on this observation and considering that radioactivity fluctuations correlated with body temperature rhythms, a method for short-term prediction of ultradian rhythms of animal activity has been developed and confirmed. An analysis of the consistency of the dynamics of the intensity of decay fluctuations and daily growth rates of an L-929 cell culture was also carried out. It was found that the highest correlation coefficient was recorded when the indicator of proliferative activity of the culture was compared with the intensity of decay fluctuations taken over the previous day. Thus, based on data on fluctuations in the radioactive decay of 40K, which are an indicator of the biotropic factor of the environment, it is possible to make short-term forecasts of ultradian and infradian biological rhythms.","PeriodicalId":493,"journal":{"name":"Biophysics","volume":"68 6","pages":"1041 - 1047"},"PeriodicalIF":4.033,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140884777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Study on the Radiosensitivity and Induction of Adaptive Response in Peripheral Blood Lymphocytes of Patients with Secondary Immunodeficiency Syndrome 继发性免疫缺陷综合征患者外周血淋巴细胞的放射敏感性和适应性反应诱导研究

IF 4.033

Biophysics Pub Date : 2024-03-07 DOI: 10.1134/S000635092305024X

O. M. Rozanova, E. N. Smirnova, T. A. Belyakova, N. S. Strelnikova

{"title":"A Study on the Radiosensitivity and Induction of Adaptive Response in Peripheral Blood Lymphocytes of Patients with Secondary Immunodeficiency Syndrome","authors":"O. M. Rozanova, E. N. Smirnova, T. A. Belyakova, N. S. Strelnikova","doi":"10.1134/S000635092305024X","DOIUrl":"10.1134/S000635092305024X","url":null,"abstract":"This study examined radiosensitivity to low- and high-dose exposure to X-rays in human lymphocytes and the ability of low and high radiation doses to induce radioadaptive response when peripheral blood cells from patients with secondary immune deficiency syndrome and healthy donors of different ages were irradiated in vitro. The occurrence of micronuclei in cytochalasin-blocked binucleated lymphocytes in culture served as an indication of cytogenetic damage. It was found that the spontaneous level of cytogenetic damage in blood lymphocytes of patients with secondary immune deficiency syndrome was 2.5 times greater than in healthy young and older volunteers, and there was also a substantial interindividual variability in the outcome parameters as compared to the data of control groups. There were no differences in the mean values for radiosensitivity to low- and high-dose exposure to X-rays between the groups. In all groups, no correlation was shown between the spontaneous level of micronuclei in lymphocytes and the radiosensitivity of individuals. The adaptive response was induced with the same frequency and to the same extent in lymphocytes in patients with secondary immune deficiency syndrome and in healthy donors of different ages.","PeriodicalId":493,"journal":{"name":"Biophysics","volume":"68 5","pages":"765 - 771"},"PeriodicalIF":4.033,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140076608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Cellular Response to Exposure to Ionizing Radiation and Light in the Presence of a Photosensitizer 光敏剂存在时细胞对电离辐射和光的反应

IF 4.033

Biophysics Pub Date : 2024-03-07 DOI: 10.1134/S0006350923050044

S. V. Akulinichev, S. I. Glukhov, A. V. Efremenko, D. A. Kokontsev, E. A. Kuznetsova, V. V. Martynova, A. V. Feofanov, I. A. Yakovlev

引用次数: 0

Modeling the Critical Flicker Fusion Frequency in the Human Visual System 模拟人类视觉系统中的临界闪烁融合频率

IF 4.033

Biophysics Pub Date : 2024-03-07 DOI: 10.1134/S0006350923050147

S. I. Lyapunov, I. I. Shoshina, I. S. Lyapunov

引用次数: 0

On the Illusion of Flying in Dreams: The Mechanism of its Occurrence 论梦中飞翔的幻觉：梦中飞行的机制