During the First Chinese Antarctic Expedition zooplankton samples were collected at each of the oceanography stations in the waters around South Sheltland Islands (S. S. Is.) and in the northern part of the Bellinshau...During the First Chinese Antarctic Expedition zooplankton samples were collected at each of the oceanography stations in the waters around South Sheltland Islands (S. S. Is.) and in the northern part of the Bellinshausen Sea from 20 January to 12 February, 1985 by vertical tows of an 80 cm diameter conical net from 200 m to surface. Two deep tows with a closing net. were performed in slope water north of S.S. Is, and in the basin of Bransfield Strait. Eggs and larvae of Euphatisia superba Dana in zooplankton samples were identified and counted.There were four records of eggs from 27 stations. Most catches were of small number and restricted to within the nearshore area south of S.S Is.The largest number (1500/1000 cubic meters )was found in the outer side of Smith Island.No Nauplius was found . The earliest stage we found 【was Metanauplius , in two deep tows. The distribution of Calyptopis MI and Furcili I-III were quite similar. They were found mainly in three areas: 1 ) nearshore water along the展开更多
Dear Editor,Sheep and goats were among the earliest domestic animals(Zeder,2008).During the transition from being hunted to being herded,excess males not involved in propagation were slaughtered at young ages under th...Dear Editor,Sheep and goats were among the earliest domestic animals(Zeder,2008).During the transition from being hunted to being herded,excess males not involved in propagation were slaughtered at young ages under the sex-biased harvest strategies(Zeder,2008).展开更多
Do you have a favorite hairstyle?Maybe you like to braid or wave your hair.Perhaps you curl it or use a relaxer.Many people love the texture and style their hairs have naturally.To try a new style or color,you might e...Do you have a favorite hairstyle?Maybe you like to braid or wave your hair.Perhaps you curl it or use a relaxer.Many people love the texture and style their hairs have naturally.To try a new style or color,you might even wear a wig!The earliest wigs date back thousands of years.Some experts say evidence may suggest the earliest wigs were made up to 100,000 years ago.展开更多
1.The new Yin Ruins Museum at the Yin Ruins complex,Anyang,Henan Province,opened on February 26,2024.Once the center of power for the Shang Dynasty(1600-1046 BCE),the site is home to modern China's earliest archae...1.The new Yin Ruins Museum at the Yin Ruins complex,Anyang,Henan Province,opened on February 26,2024.Once the center of power for the Shang Dynasty(1600-1046 BCE),the site is home to modern China's earliest archaeological excavation in 1928(Photo by VCG)。展开更多
Handaxes are often regarded as the"tool-type-specimenoof the Acheulean techno-complex,not only because they are a very common artefact but because they contain rich technological,behavioral,and cognitive data tha...Handaxes are often regarded as the"tool-type-specimenoof the Acheulean techno-complex,not only because they are a very common artefact but because they contain rich technological,behavioral,and cognitive data that have been used to highlight trends in human evolution and lithic production strategies.To this end,the handaxe is the earliest tool possessing consistent morphological features,in particular,the appearance of a symmetrical concept in handaxe shape when compared with other Acheulean large shaping tools(e.g.,cleavers),and their manufacture is widely regarded as a significant milestone in the evolution of lithic technology,indicating improvements in tool-making hominins’abilities for complex thought and cognition.展开更多
A best-selling author in the UK and US,Chiang Yee remains virtually unknown in his native China.But a new book seeks to position the artist and scholar to take his rightful place as one of modern China's earliest ...A best-selling author in the UK and US,Chiang Yee remains virtually unknown in his native China.But a new book seeks to position the artist and scholar to take his rightful place as one of modern China's earliest East meets West'cultural ambassadors.展开更多
Astronauts are not the only ones who dream of going into space.Since the earliest days of human spaceflight,many other people have also longed to view Earth and the heavens from above the atmosphere.
In early of 1960s, I was a graduate student studying on tRNA biochemistry. In the course of the research, the magnesium ions stabilized the tertiary structure of tRNA, resulting in its resistance to enzymatic degradat...In early of 1960s, I was a graduate student studying on tRNA biochemistry. In the course of the research, the magnesium ions stabilized the tertiary structure of tRNA, resulting in its resistance to enzymatic degradation was discovered independently. The experiment of deaminated (denatured) tRNA obtained from native tRNA was designed and conducted and further proved the validity of this finding. It was found that magnesium ions could stabilize the tertiary structure of the natrive tRNA but could not stabilize structure of the deaminated tRNA. In term of the methodology, this stabilization technique has been widely applied in sequencing analysis of RNA and has greatly promoted the progress in the study of primary structure of RNA. More importantly, the stabilization of the tertiary structure of RNA by magnesium ions plays a key role both in the processing of messenger RNAs and the ribozyme activity. After our first article in Chinese was published in 1963, a paper of Nishimura & Novelli came into our note. The received date of their paper was March 22 of 1963, only 4 days earlier than that of our first paper. Thus, we and Nishimura & Novelli made almost at the same time the earliest discovery of the role of magnesium ions on stabilizing the tertiary structure of the transfer RNA and thus resulted in resistance of tRNA degradation by enzymes. However, this discovery was not initially appreciated for a period of time but was finally “visualized” and proved by X-ray crystal structure of yeast phenylalanine tRNA, which has provided more accurate information on the geometry of the magnesium-binding sites in tRNA.展开更多
The first discovery of the earliest angiospermous megafossils, so far in the world,was made by the authors from the Lower Cretaceous Chengzihe Formation of Jixi Basin, eastern Heilongjiang Province,China.Among the ang...The first discovery of the earliest angiospermous megafossils, so far in the world,was made by the authors from the Lower Cretaceous Chengzihe Formation of Jixi Basin, eastern Heilongjiang Province,China.Among the angiospermous fossils there are 5 species belonging to 5 genera (including 4 gen.et sp.nov.) reported in this paper.Their microphyllous leaves with irregular venations show the characteristics of some primitive angiosperms whose age is mostly corresponding to the late Hauterivian-early Barremian, partly proved by the underlying conformably marine beds with the Valanginian-Hauterivian dinoflagellates revealed newly also by the authors.展开更多
Yangtzeconus priscus-Archaeospira ornata, an important earliest Cambrian benthonic Assemblage of the Yangtze micromolluscan fauna, occurs mainly in the Lower Cambrian Zhongyicun and Dahai Members of the Yuhucun Format...Yangtzeconus priscus-Archaeospira ornata, an important earliest Cambrian benthonic Assemblage of the Yangtze micromolluscan fauna, occurs mainly in the Lower Cambrian Zhongyicun and Dahai Members of the Yuhucun Formation in E Yunnan, the Tianzhushan Member （=Huangshandong Member） of the Dengying Formation in W Hubei and the Maidiping Member of the Hungchunping Formation in C Sichuan, China. About 90% of the genera of this Assemblage are unknown from the Nemakit-Daldynian and Tommotian molluscan Assemblages of the Siberian Platform, Russia. About 90% of the Siberian molluscan genera do not occur in the Zhongyicun and Dahai Members in the Meishucun section and in the corresponding beds of the Yangtze Platform, because the Tommotian molluscan Assemblage is characterizedly abundant archaeocyathids. It is clearly indicated that the Yangtze and Siberian molluscan Assemblages represent different bio- and lithofacies and ages. The age of the pre-trilobitic Yangtzeconus priscus-Archaeospira ornata Assemblage is older than that of the Nemakit-Daldynian and Tommotian molluscan Assemblages and referable to the Earliest Cambrian. Two new genera Mcnamaraconus and Zhangwentangoconus are herein proposed.展开更多
Based on one linguistic system-copular verb be,and hypotheses about verb be,the learner’s error types are typical with the same age group while Chinese English structure is relatively less significant.The result show...Based on one linguistic system-copular verb be,and hypotheses about verb be,the learner’s error types are typical with the same age group while Chinese English structure is relatively less significant.The result shows that the learner’s first language and earliest period of learning are both significant for her target language study.展开更多
Few would doubt that understanding the developmental landscape from which a mature neuron is derived is essential to understand its biology.The temporal and spatial position of a cell from the very earliest stages of ...Few would doubt that understanding the developmental landscape from which a mature neuron is derived is essential to understand its biology.The temporal and spatial position of a cell from the very earliest stages of development predicts the unique combinations of growth factors it will subsequently be exposed to.展开更多
The passage of our Solar System through the spiral arms has been implicated as a contributor to global environmental perturbations.The suggestion of a consistent structure within the arms,informed by density wave theo...The passage of our Solar System through the spiral arms has been implicated as a contributor to global environmental perturbations.The suggestion of a consistent structure within the arms,informed by density wave theory,raises the possibility of repeating patterns of events at each arm crossing.Here we test the hypothesis that the structure of the arms of our galaxy influences the stratigraphic record on Earth.We construct independent structural and temporal models and colbine these to compare the timings of arm tracers,materials from the earliest Solar System and events on Earth,including the largest extinctions.We find that a recurring sequence of events across the four arms emerges with an average arm-passing time of 188 million years.We suggest that the multiple temporal overlaps of events across arms,and their alignment with arm tracers and the earliest Solar System,presents an opportunity for a greater understanding of both Earth-based phenomena and galactic structure.展开更多
This is a study of the earliest poetry by the modern Chinese writer Guo Moruo （1892-1978）, composed between 1904 and 1912. He became famous mostly due to his ＂early poetry＂ composed in the 1920s, such as Niishen ...This is a study of the earliest poetry by the modern Chinese writer Guo Moruo （1892-1978）, composed between 1904 and 1912. He became famous mostly due to his ＂early poetry＂ composed in the 1920s, such as Niishen （The Goddesses）, but he was also an author of autobiographies. His autobiography Shaonian shidai （Childhood） and the poems published in the volume Guo Moruo shaonian shigao （Guo Moruo＇s childhood poetry）, are analysed here in comparison with the traditional Tang poetry.展开更多
Developing a comprehensive model of the early universe that describes events and conditions prior to recombination has proved difficult. Using a new approach, we express Heisenberg’s uncertainty principle in terms of...Developing a comprehensive model of the early universe that describes events and conditions prior to recombination has proved difficult. Using a new approach, we express Heisenberg’s uncertainty principle in terms of measures and counts of those measures to resolve an expression consisting entirely of counts. The description allows us to resolve explicit values for discrete measures. With these values, we present new expressions describing the earliest epoch and the transition event that initiates expansion. We determine the quantity, age, density, and temperature of the cosmic microwave background (CMB). Moreover, we approach the CMB power spectrum anew, describing each mass/energy distribution, its physical significance, its peak temperature, and the effects of relativity. We do not engage in fitting or modification of the existing laws of physics. The approach is classical and correlates both quantum and cosmological phenomena with descriptive expressions that are measurable, verifiable, and falsifiable.展开更多
文摘During the First Chinese Antarctic Expedition zooplankton samples were collected at each of the oceanography stations in the waters around South Sheltland Islands (S. S. Is.) and in the northern part of the Bellinshausen Sea from 20 January to 12 February, 1985 by vertical tows of an 80 cm diameter conical net from 200 m to surface. Two deep tows with a closing net. were performed in slope water north of S.S. Is, and in the basin of Bransfield Strait. Eggs and larvae of Euphatisia superba Dana in zooplankton samples were identified and counted.There were four records of eggs from 27 stations. Most catches were of small number and restricted to within the nearshore area south of S.S Is.The largest number (1500/1000 cubic meters )was found in the outer side of Smith Island.No Nauplius was found . The earliest stage we found 【was Metanauplius , in two deep tows. The distribution of Calyptopis MI and Furcili I-III were quite similar. They were found mainly in three areas: 1 ) nearshore water along the
基金supported by the National Natural Science Foundation of China (32061133010, U21A20246)the National Key Research and Development Program-Key Projects (2021YFD1300904)+1 种基金Initiation Fund of Sanya Institute of China Agricultural University (SYND-2022-12)the High-performance Computing Platform of China Agricultural University。
文摘Dear Editor,Sheep and goats were among the earliest domestic animals(Zeder,2008).During the transition from being hunted to being herded,excess males not involved in propagation were slaughtered at young ages under the sex-biased harvest strategies(Zeder,2008).
文摘Do you have a favorite hairstyle?Maybe you like to braid or wave your hair.Perhaps you curl it or use a relaxer.Many people love the texture and style their hairs have naturally.To try a new style or color,you might even wear a wig!The earliest wigs date back thousands of years.Some experts say evidence may suggest the earliest wigs were made up to 100,000 years ago.
文摘1.The new Yin Ruins Museum at the Yin Ruins complex,Anyang,Henan Province,opened on February 26,2024.Once the center of power for the Shang Dynasty(1600-1046 BCE),the site is home to modern China's earliest archaeological excavation in 1928(Photo by VCG)。
基金supported by the National Natural Science Foundation of China BSCTPES project(41988101)。
文摘Handaxes are often regarded as the"tool-type-specimenoof the Acheulean techno-complex,not only because they are a very common artefact but because they contain rich technological,behavioral,and cognitive data that have been used to highlight trends in human evolution and lithic production strategies.To this end,the handaxe is the earliest tool possessing consistent morphological features,in particular,the appearance of a symmetrical concept in handaxe shape when compared with other Acheulean large shaping tools(e.g.,cleavers),and their manufacture is widely regarded as a significant milestone in the evolution of lithic technology,indicating improvements in tool-making hominins’abilities for complex thought and cognition.
文摘A best-selling author in the UK and US,Chiang Yee remains virtually unknown in his native China.But a new book seeks to position the artist and scholar to take his rightful place as one of modern China's earliest East meets West'cultural ambassadors.
文摘Astronauts are not the only ones who dream of going into space.Since the earliest days of human spaceflight,many other people have also longed to view Earth and the heavens from above the atmosphere.
文摘In early of 1960s, I was a graduate student studying on tRNA biochemistry. In the course of the research, the magnesium ions stabilized the tertiary structure of tRNA, resulting in its resistance to enzymatic degradation was discovered independently. The experiment of deaminated (denatured) tRNA obtained from native tRNA was designed and conducted and further proved the validity of this finding. It was found that magnesium ions could stabilize the tertiary structure of the natrive tRNA but could not stabilize structure of the deaminated tRNA. In term of the methodology, this stabilization technique has been widely applied in sequencing analysis of RNA and has greatly promoted the progress in the study of primary structure of RNA. More importantly, the stabilization of the tertiary structure of RNA by magnesium ions plays a key role both in the processing of messenger RNAs and the ribozyme activity. After our first article in Chinese was published in 1963, a paper of Nishimura & Novelli came into our note. The received date of their paper was March 22 of 1963, only 4 days earlier than that of our first paper. Thus, we and Nishimura & Novelli made almost at the same time the earliest discovery of the role of magnesium ions on stabilizing the tertiary structure of the transfer RNA and thus resulted in resistance of tRNA degradation by enzymes. However, this discovery was not initially appreciated for a period of time but was finally “visualized” and proved by X-ray crystal structure of yeast phenylalanine tRNA, which has provided more accurate information on the geometry of the magnesium-binding sites in tRNA.
基金Project supported by the President Funds of Academia Sinicapartly by the Special Supporting Funds of Academia Sinica (Project No. 900202)the National Natural Science Foundation of China (No. 9390010).
文摘The first discovery of the earliest angiospermous megafossils, so far in the world,was made by the authors from the Lower Cretaceous Chengzihe Formation of Jixi Basin, eastern Heilongjiang Province,China.Among the angiospermous fossils there are 5 species belonging to 5 genera (including 4 gen.et sp.nov.) reported in this paper.Their microphyllous leaves with irregular venations show the characteristics of some primitive angiosperms whose age is mostly corresponding to the late Hauterivian-early Barremian, partly proved by the underlying conformably marine beds with the Valanginian-Hauterivian dinoflagellates revealed newly also by the authors.
文摘Yangtzeconus priscus-Archaeospira ornata, an important earliest Cambrian benthonic Assemblage of the Yangtze micromolluscan fauna, occurs mainly in the Lower Cambrian Zhongyicun and Dahai Members of the Yuhucun Formation in E Yunnan, the Tianzhushan Member （=Huangshandong Member） of the Dengying Formation in W Hubei and the Maidiping Member of the Hungchunping Formation in C Sichuan, China. About 90% of the genera of this Assemblage are unknown from the Nemakit-Daldynian and Tommotian molluscan Assemblages of the Siberian Platform, Russia. About 90% of the Siberian molluscan genera do not occur in the Zhongyicun and Dahai Members in the Meishucun section and in the corresponding beds of the Yangtze Platform, because the Tommotian molluscan Assemblage is characterizedly abundant archaeocyathids. It is clearly indicated that the Yangtze and Siberian molluscan Assemblages represent different bio- and lithofacies and ages. The age of the pre-trilobitic Yangtzeconus priscus-Archaeospira ornata Assemblage is older than that of the Nemakit-Daldynian and Tommotian molluscan Assemblages and referable to the Earliest Cambrian. Two new genera Mcnamaraconus and Zhangwentangoconus are herein proposed.
文摘Based on one linguistic system-copular verb be,and hypotheses about verb be,the learner’s error types are typical with the same age group while Chinese English structure is relatively less significant.The result shows that the learner’s first language and earliest period of learning are both significant for her target language study.
基金Raine Foundation Priming GrantAustralian Research Council Discovery Project Grant(DP772899)Cancer Council WA Suzanne Cavanagh Early Career Research Grant
文摘Few would doubt that understanding the developmental landscape from which a mature neuron is derived is essential to understand its biology.The temporal and spatial position of a cell from the very earliest stages of development predicts the unique combinations of growth factors it will subsequently be exposed to.
文摘The passage of our Solar System through the spiral arms has been implicated as a contributor to global environmental perturbations.The suggestion of a consistent structure within the arms,informed by density wave theory,raises the possibility of repeating patterns of events at each arm crossing.Here we test the hypothesis that the structure of the arms of our galaxy influences the stratigraphic record on Earth.We construct independent structural and temporal models and colbine these to compare the timings of arm tracers,materials from the earliest Solar System and events on Earth,including the largest extinctions.We find that a recurring sequence of events across the four arms emerges with an average arm-passing time of 188 million years.We suggest that the multiple temporal overlaps of events across arms,and their alignment with arm tracers and the earliest Solar System,presents an opportunity for a greater understanding of both Earth-based phenomena and galactic structure.
文摘This is a study of the earliest poetry by the modern Chinese writer Guo Moruo （1892-1978）, composed between 1904 and 1912. He became famous mostly due to his ＂early poetry＂ composed in the 1920s, such as Niishen （The Goddesses）, but he was also an author of autobiographies. His autobiography Shaonian shidai （Childhood） and the poems published in the volume Guo Moruo shaonian shigao （Guo Moruo＇s childhood poetry）, are analysed here in comparison with the traditional Tang poetry.
文摘Developing a comprehensive model of the early universe that describes events and conditions prior to recombination has proved difficult. Using a new approach, we express Heisenberg’s uncertainty principle in terms of measures and counts of those measures to resolve an expression consisting entirely of counts. The description allows us to resolve explicit values for discrete measures. With these values, we present new expressions describing the earliest epoch and the transition event that initiates expansion. We determine the quantity, age, density, and temperature of the cosmic microwave background (CMB). Moreover, we approach the CMB power spectrum anew, describing each mass/energy distribution, its physical significance, its peak temperature, and the effects of relativity. We do not engage in fitting or modification of the existing laws of physics. The approach is classical and correlates both quantum and cosmological phenomena with descriptive expressions that are measurable, verifiable, and falsifiable.
