In this article we review some of the most important and relevant literature on the properties of ice. We focus on three of its surface properties, namely, the slipperiness of ice, the phenomena of a string under load...In this article we review some of the most important and relevant literature on the properties of ice. We focus on three of its surface properties, namely, the slipperiness of ice, the phenomena of a string under load passing through a block of ice without cutting the block in half, and pressure melting and adhesion of blocks of ice. We then provide an argument for the most plausible factor responsible for each of these effects.展开更多
When particles are embedded in the ice near its bulk melting temperature,a premelted film forms between the particles and ice in a process known as"interfacial premelting".Under the influence of a temperatur...When particles are embedded in the ice near its bulk melting temperature,a premelted film forms between the particles and ice in a process known as"interfacial premelting".Under the influence of a temperature gradient,the premelted film varies in thickness,modulating the strength of ice-particle interactions and producing a net pressure that drives the particles to migrate towards higher temperatures in a phenomenon known as"thermal regelation".The phenomenon of thermal regelation is related to frost heave of soil,cryopreservation of organisms and methods of ice core paleoclimatology.In order to further investigate the principles of thermodynamics and dynamics in thermal regelation,we built a temperature gradient control platform and a single layer visual polydimethylsiloxane(PDMS)chip for thermal regelation experiments of individual silica particles.In the experiment,we measured the migration velocity of individual particles at different locations in the ice,and found that the thermal regelation of particles can be divided into high speed and low speed stages.As the particles approach the ice-water interface,the migration velocity increases dramatically.By combining the experimental data with the premelting theory,we found that the observed behavior is phenomenologically consistent with expectations for van der Waals force with radii of 12.5μm and 10μm.However,when the particle size was reduced to 7.5μm,the observed behavior was phenomenologically consistent with expectations for undelayed van der Waals force.In addition,under different temperature gradients and particle sizes,the thickness of the premelted film was maintained in the range of 20 nm-60 nm close to 273.15 K.However,under the same supercooling degree,the thickness of the premelted film increases with the increased of temperature gradient.Among the extracted parameters,the parameterλ,which was related to the van der Waals force,was linearly related to the temperature gradient.These experimental results not only provided important quantitative information for further understanding of thermal regelation but also provided a theoretical basis for optimizing related applications.展开更多
[Objective] Study on antibacterial activity and stability of the ethanol extracts from Allium mongolicum Regel.[Method] Taking Allium mongolicum Regel.(AMR)as experimental material,the antibacterial and stability test...[Objective] Study on antibacterial activity and stability of the ethanol extracts from Allium mongolicum Regel.[Method] Taking Allium mongolicum Regel.(AMR)as experimental material,the antibacterial and stability test,antibacterial capacity and antibacterial activity substance stability of extracts were studied.[Result] Size order of antibacterial effect of extracts on these 5 strains tended to be:Saccharomyces cerevisiae > Penicillium sp.> Aspergillusniger> Staphylococcusaureus> Escherichia coli;under neutral or slight alkaline conditions,optimum antibacterial effect presented best;and UV light irradiation basically had no influence on tested strains.[Conclusion] Antibacterial effect of ethanol extract shows great difference among these strains,and antibacterial activity substance is of good heat and UV light stability.展开更多
兰靛果忍冬(Lonicera caerulea L. var. edulis Regel.)为忍冬科,忍冬属的一个变种。是分布广、贮量大、营养丰富、有很大利用价值的野生小浆果类果树,是果品加工的新原料。一、形态特征兰靛果忍冬是落叶灌木,在野生状态下,最高可达5米...兰靛果忍冬(Lonicera caerulea L. var. edulis Regel.)为忍冬科,忍冬属的一个变种。是分布广、贮量大、营养丰富、有很大利用价值的野生小浆果类果树,是果品加工的新原料。一、形态特征兰靛果忍冬是落叶灌木,在野生状态下,最高可达5米,一般为0.5～2米。浅根,项根多分布在地表10～20厘米的腐殖质层内。多枝根出,呈丛状。老枝皮灰褐色。展开更多
This paper presents a model of isotopic fractionation by freezing under near equilibrium conditions in an open system and uses the model to predict the fractionation curve and slope gradient of δ 18 O versus δ...This paper presents a model of isotopic fractionation by freezing under near equilibrium conditions in an open system and uses the model to predict the fractionation curve and slope gradient of δ 18 O versus δD. The simulation results show that 1) the fractionation curve and slope gradient are determined by the ratio of freezing rate to input rate, 2) the isotopic value in the initial stage of freezing is determined by the isotopic value of initial water; 3) in the latter half of freezing in an open system, the isotopic value converges to a certain value determined by that of input water. These results suggest that the shape of the fractionation curve is the method to distinguish whether freezing occurred in a closed or open system. This analysis is applied to an isotopic curve observed in basal ice of Hamna Glacier, Sya drainage, East Antarctica. The isotopic curve indicates formation by regelation in an open system with a ratio of freezing/input rates of about 10/4.展开更多
A new morphinane alkaloid named as mecoquitupline was isolated from Meconopsis quintuplinervia Regel. Its structure was elucidated to be 6-methoxy-17-methyl-2,3-[methylene bis(oxy)]-morphinan-5-en-7-one by spectrosco...A new morphinane alkaloid named as mecoquitupline was isolated from Meconopsis quintuplinervia Regel. Its structure was elucidated to be 6-methoxy-17-methyl-2,3-[methylene bis(oxy)]-morphinan-5-en-7-one by spectroscopic techniques.展开更多
The article analyzes the natural distribution area of the species <i>Tulipa kaufmanniana</i> Regel using the programs of type MaxEnt and ArcGis, the endemic of Central Asia (past, current, future). Accordi...The article analyzes the natural distribution area of the species <i>Tulipa kaufmanniana</i> Regel using the programs of type MaxEnt and ArcGis, the endemic of Central Asia (past, current, future). According to the results of the study, it is proved that the main distribution of the species coincides with the boundaries of the areali Tien-Shan mountain system (Uzbekistan, Kazakhstan). It is noted that the climatic factors that are optimal for the species are sufficient temperature and annual precipitation.展开更多
A new triterpenoid saponins, raddeanoside R19 （1） was isolated from the rhizome of Anemone raddeana Regel. The effects of raddeanoside R119 on superoxide generation in human neutrophil were evaluated. The compound s...A new triterpenoid saponins, raddeanoside R19 （1） was isolated from the rhizome of Anemone raddeana Regel. The effects of raddeanoside R119 on superoxide generation in human neutrophil were evaluated. The compound suppressed the superoxide generation induced by N-formyl-methionyl-leucyl-phenylalanine （fMLP）, phorbol 12-myristate 13-acetate （PMA） and arachidonic acid （AA） in a different concentration-dependent manner.展开更多
The results of the study Crocus korolkovii Regel & Maw, were introduced into the Tashkent Botanical Garden. Bioecological features, morphological and anatomical characteristics of Crocus korolkovii were studied. P...The results of the study Crocus korolkovii Regel & Maw, were introduced into the Tashkent Botanical Garden. Bioecological features, morphological and anatomical characteristics of Crocus korolkovii were studied. Phenology was studied by I.N. Beideman, biology bloom by A.P. Ponomarev, breeding and seed production of plants by T.T. Rakhimova. The study of the biology of flowering determined the optimal humidity, air temperature and soil surface. The anatomic study used fresh tissue samples which were fixed in 70% alcohol. A cross-section of the sheet and the structure of the flower in the introduction of conditions were studied.展开更多
The research results of environment impact on growth and development of Polygonatum odoratum (Mill.) Druce and Polygonatum severtzowii Regel species are given in the article. The effect of light intensity, temperature...The research results of environment impact on growth and development of Polygonatum odoratum (Mill.) Druce and Polygonatum severtzowii Regel species are given in the article. The effect of light intensity, temperature and humidity factors was noted in the studied species.展开更多
文摘In this article we review some of the most important and relevant literature on the properties of ice. We focus on three of its surface properties, namely, the slipperiness of ice, the phenomena of a string under load passing through a block of ice without cutting the block in half, and pressure melting and adhesion of blocks of ice. We then provide an argument for the most plausible factor responsible for each of these effects.
基金supported by The National Science Foundation for Distinguished Young Scholars of China(No.12102418)Zhejiang Provincial Natural Science Foundation of China(No.LQ21A020007)Youth Science and Technology Innovation Personnel Training Project(Category B)(No.2021YW48)。
文摘When particles are embedded in the ice near its bulk melting temperature,a premelted film forms between the particles and ice in a process known as"interfacial premelting".Under the influence of a temperature gradient,the premelted film varies in thickness,modulating the strength of ice-particle interactions and producing a net pressure that drives the particles to migrate towards higher temperatures in a phenomenon known as"thermal regelation".The phenomenon of thermal regelation is related to frost heave of soil,cryopreservation of organisms and methods of ice core paleoclimatology.In order to further investigate the principles of thermodynamics and dynamics in thermal regelation,we built a temperature gradient control platform and a single layer visual polydimethylsiloxane(PDMS)chip for thermal regelation experiments of individual silica particles.In the experiment,we measured the migration velocity of individual particles at different locations in the ice,and found that the thermal regelation of particles can be divided into high speed and low speed stages.As the particles approach the ice-water interface,the migration velocity increases dramatically.By combining the experimental data with the premelting theory,we found that the observed behavior is phenomenologically consistent with expectations for van der Waals force with radii of 12.5μm and 10μm.However,when the particle size was reduced to 7.5μm,the observed behavior was phenomenologically consistent with expectations for undelayed van der Waals force.In addition,under different temperature gradients and particle sizes,the thickness of the premelted film was maintained in the range of 20 nm-60 nm close to 273.15 K.However,under the same supercooling degree,the thickness of the premelted film increases with the increased of temperature gradient.Among the extracted parameters,the parameterλ,which was related to the van der Waals force,was linearly related to the temperature gradient.These experimental results not only provided important quantitative information for further understanding of thermal regelation but also provided a theoretical basis for optimizing related applications.
文摘[Objective] Study on antibacterial activity and stability of the ethanol extracts from Allium mongolicum Regel.[Method] Taking Allium mongolicum Regel.(AMR)as experimental material,the antibacterial and stability test,antibacterial capacity and antibacterial activity substance stability of extracts were studied.[Result] Size order of antibacterial effect of extracts on these 5 strains tended to be:Saccharomyces cerevisiae > Penicillium sp.> Aspergillusniger> Staphylococcusaureus> Escherichia coli;under neutral or slight alkaline conditions,optimum antibacterial effect presented best;and UV light irradiation basically had no influence on tested strains.[Conclusion] Antibacterial effect of ethanol extract shows great difference among these strains,and antibacterial activity substance is of good heat and UV light stability.
文摘兰靛果忍冬(Lonicera caerulea L. var. edulis Regel.)为忍冬科,忍冬属的一个变种。是分布广、贮量大、营养丰富、有很大利用价值的野生小浆果类果树,是果品加工的新原料。一、形态特征兰靛果忍冬是落叶灌木,在野生状态下,最高可达5米,一般为0.5～2米。浅根,项根多分布在地表10～20厘米的腐殖质层内。多枝根出,呈丛状。老枝皮灰褐色。
文摘This paper presents a model of isotopic fractionation by freezing under near equilibrium conditions in an open system and uses the model to predict the fractionation curve and slope gradient of δ 18 O versus δD. The simulation results show that 1) the fractionation curve and slope gradient are determined by the ratio of freezing rate to input rate, 2) the isotopic value in the initial stage of freezing is determined by the isotopic value of initial water; 3) in the latter half of freezing in an open system, the isotopic value converges to a certain value determined by that of input water. These results suggest that the shape of the fractionation curve is the method to distinguish whether freezing occurred in a closed or open system. This analysis is applied to an isotopic curve observed in basal ice of Hamna Glacier, Sya drainage, East Antarctica. The isotopic curve indicates formation by regelation in an open system with a ratio of freezing/input rates of about 10/4.
文摘A new morphinane alkaloid named as mecoquitupline was isolated from Meconopsis quintuplinervia Regel. Its structure was elucidated to be 6-methoxy-17-methyl-2,3-[methylene bis(oxy)]-morphinan-5-en-7-one by spectroscopic techniques.
文摘The article analyzes the natural distribution area of the species <i>Tulipa kaufmanniana</i> Regel using the programs of type MaxEnt and ArcGis, the endemic of Central Asia (past, current, future). According to the results of the study, it is proved that the main distribution of the species coincides with the boundaries of the areali Tien-Shan mountain system (Uzbekistan, Kazakhstan). It is noted that the climatic factors that are optimal for the species are sufficient temperature and annual precipitation.
基金supported by National Natural Science Foundation of China(No.30500050)by Natural Science Foundation of Liaoning province of China(No.2050340)
文摘A new triterpenoid saponins, raddeanoside R19 （1） was isolated from the rhizome of Anemone raddeana Regel. The effects of raddeanoside R119 on superoxide generation in human neutrophil were evaluated. The compound suppressed the superoxide generation induced by N-formyl-methionyl-leucyl-phenylalanine （fMLP）, phorbol 12-myristate 13-acetate （PMA） and arachidonic acid （AA） in a different concentration-dependent manner.
文摘The results of the study Crocus korolkovii Regel & Maw, were introduced into the Tashkent Botanical Garden. Bioecological features, morphological and anatomical characteristics of Crocus korolkovii were studied. Phenology was studied by I.N. Beideman, biology bloom by A.P. Ponomarev, breeding and seed production of plants by T.T. Rakhimova. The study of the biology of flowering determined the optimal humidity, air temperature and soil surface. The anatomic study used fresh tissue samples which were fixed in 70% alcohol. A cross-section of the sheet and the structure of the flower in the introduction of conditions were studied.
文摘The research results of environment impact on growth and development of Polygonatum odoratum (Mill.) Druce and Polygonatum severtzowii Regel species are given in the article. The effect of light intensity, temperature and humidity factors was noted in the studied species.
