GRV 90027 is a Martian lherzolitic shergottites （L-S） containing poikilitic, non-poikilitic, and melted pocket components. GRV 99027 is mainly composed of olive （55 vol% ） and pyroxene （37.5 vol% ）, with minor m...GRV 90027 is a Martian lherzolitic shergottites （L-S） containing poikilitic, non-poikilitic, and melted pocket components. GRV 99027 is mainly composed of olive （55 vol% ） and pyroxene （37.5 vol% ）, with minor maskelynite （6 vol% ） and chromite （ 1.5 vol% ）, and trace whitelockite and troilite, ect. In this paper, the mineralogy and petrology of GRV 99027 are reported; in addition, the geochemical characteristics of the REEs and H isotopes in the GRV 99027 are also further investigated. The 2REE in GRV 99027 is relatively low; HREEs are enriched in olivine and pyroxene grains; LREEs are enriched in plagioclase with a high positive Eu anomaly. High EREE value is found in rare mineral whitlockite （less than 0. 2 vol% ）, LREE ≈ HREE, and whitlockite has a negative Eu anomaly. The REE distribution patterns of the whole -rock of GRV 99027 is similar to but different from that of other L-S Martian meteorites, indicating that they came from different location of Mars. GRV 99027 has a high 8D value. Different water-bearing minerals give different contribution for 8D value. The 8D of phosphates generally does not correlate with water content, and 8D has a weak negative correlation with water content. GRV 99027 can be classified as an L-S Martian meteorite based on mineralogical assemblage patterns, REE distribution patterns, and hydrogen isotope. The isotope data of Sr, Nd, Pb, Os and REE from other L-S Martian meteorites were collected to discuss the formation history of the GRV 99027. Similar to other L-S Martian meteorites, GRV 99027 originated from part of Mar＇s mantle; during one strong impact event about 4M years ago, the meteorites were ejected from deep mantle into space, and traveled for a different duration in space （indicated by different cosmic exposure time）, and captured by the Earth later in different time, ultimately falling on the Antarctica as L-S Martian meteorites.展开更多
We have determined the concentrations of 10Be and 26Al in GRV 99027 recovered by the 16th Chinese Antarctic expedition team, which are 14.1 ± 0.6 dpm/kg and 67.5 ± 3.4 dpm/kg, respectively. From the concentr...We have determined the concentrations of 10Be and 26Al in GRV 99027 recovered by the 16th Chinese Antarctic expedition team, which are 14.1 ± 0.6 dpm/kg and 67.5 ± 3.4 dpm/kg, respectively. From the concentration of 10Be, we calculate a cosmic-ray exposure age of 4.4 ± 0.6 Ma for GRV 99027. The concentration of 26Al is too high compared to the 10Be exposure age, indicating extra production from solar ray. The exposure ages, petrologic and geochemical characteristics of mantle-derived Martian meteorites GRV 99027, LEW 88516, Y-793605, NWA 1950 and ALHA77005 are very similar, suggesting that these meteorites most probably were ejected from Mars in the same impact event.展开更多
We report the petrography, mineral chemistry and oxygen isotopic composition of GRV 99027, a new Mar-tian meteorite recently collected during the 16th Chinese Antarctic Research Expedition. This meteorite consists of ...We report the petrography, mineral chemistry and oxygen isotopic composition of GRV 99027, a new Mar-tian meteorite recently collected during the 16th Chinese Antarctic Research Expedition. This meteorite consists of two textural regions. The interstitial region is characterized by the presence of plagioclase and phosphate, and higher FeO contents of olivine and orthopyroxene, in comparison with the poikilitic region. All of the observations are similar to the three known Martian lherzolites. We classify GRV 99027 as the fourth sample of Martian lherzolite.展开更多
目的探讨卒中患者肠内营养喂养不耐受(enteral nutrition feeding intolerance,ENFI)的影响因素。方法选取建库至2024年12月中国知网、万方、维普、Cochrane library、Embase、PubMed、Web of Science、SinoMed等数据库发表的探讨卒中患...目的探讨卒中患者肠内营养喂养不耐受(enteral nutrition feeding intolerance,ENFI)的影响因素。方法选取建库至2024年12月中国知网、万方、维普、Cochrane library、Embase、PubMed、Web of Science、SinoMed等数据库发表的探讨卒中患者ENFI的中英文队列研究和病例对照研究。对所有文献进行整理和分析,使用纽卡斯尔-渥太华量表(Newcastle-Ottawa-scale,NOS)评估文献质量,并对卒中患者ENFI的影响因素进行meta分析。结果共检索文献1435篇,最终纳入文献15篇,涉及2831例患者;15篇文献NOS评分≥7分,均为高质量文献。Meta分析结果显示,卒中患者ENFI的发生率为42%(95%CI:34%~49%,P<0.05,I^(2)=73%)。年龄≥60岁(OR=3.66,95%CI:2.57~5.22,P<0.001,I^(2)=40%)、血清ALB<35 g/L(OR=6.39,95%CI:4.14~9.84,P<0.001,I^(2)=0)、使用抗生素(OR=3.40,95%CI:2.56~4.53,P<0.001,I^(2)=30%)、使用血管活性药物(OR=3.27,95%CI:2.02~5.30,P<0.001,I^(2)=0)、亚低温治疗(OR=3.57,95%CI:1.59~7.98,P=0.002,I^(2)=0)、机械通气(OR=3.02,95%CI:2.28~4.01,P<0.001,I^(2)=0)、急性生理和慢性健康状况评价Ⅱ(acute physiology and chronic health evaluationⅡ,APACHEⅡ)评分越高(OR=3.07,95%CI:1.89~4.97,P<0.001,I^(2)=32%)、美国国立卫生研究院卒中量表(National Institutes Health Stroke Scale,NIHSS)评分越高(OR=1.10,95%CI:1.05~1.16,P<0.001,I^(2)=49%)、格拉斯哥昏迷评分(Glasgow coma scale,GCS)越低(OR=2.07,95%CI:1.18~3.63,P=0.01,I^(2)=72%)、肠道感染(OR=3.24,95%CI:1.25~8.40,P=0.02,I^(2)=64%)、喂养速度>100 ml/H(OR=3.77,95%CI:1.73~8.23,P<0.001,I^(2)=60%)的卒中患者,其ENFI的发生风险较高,添加益生菌(OR=0.36,95%CI:0.25~0.53,P<0.001,I^(2)=0)和添加膳食纤维(OR=0.24,95%CI:0.14~0.40,P<0.001,I^(2)=0)的卒中患者,ENFI的发生风险较低。结论ENFI受疾病严重程度、临床干预措施等多方面影响。临床实践中应重点识别高龄、低蛋白血症、抗生素使用、机械通气等因素,并积极采用益生菌与膳食纤维等保护性干预措施。建议医护人员结合胃残余量、腹部体征及相关实验室指标,对高风险患者实施早期、动态评估与个体化营养管理,以有效预防ENFI的发生。展开更多
Rice is one of the most important cereal crops in the world, and a substantial increase in grain yield is necessary for food security. However, high yields of semidwarf modern rice varieties are heavily dependent on t...Rice is one of the most important cereal crops in the world, and a substantial increase in grain yield is necessary for food security. However, high yields of semidwarf modern rice varieties are heavily dependent on the application of mineral nitrogenous fertilizer (Tilman et al., 2002;Sun et al., 2014). Nitrogen (N)-insensitive sponses associated with reduced N-use efficiency (NUE) is a major characteristic of the green revolution varieties (GRVs), in which the growth-inhibiting protein SLENDER RICE1 (SLR1) accumulates (Li et al., 2018). Unfortunately, increasing the level of N fertilizer use to reach the full yield potential of GRVs is subject to diminishing returns, quite apart from its deleterious effect on the environments (Rahn et al., 2009;Liu et al., 2015). Therefore, there is an urgent need to develop new rice GRVs that increase NUE while maintaining their high yields. Recently, several genes (e.g., DEP1, OsNRTl.lB, OsNRT2.3b, ARE1 and GRF4) responsible for improved NUE have been identified in rice (Sun et al.. 2014;Hu et al., 2015;Fan et al., 2016;Wang et al., 2018;Li et al., 2018). More importantly, boosting the activity of the transcription factor GRF4 overcomes the ability of SLR1 to prevent the GRF4-GIF1 interaction, which in turn promotes the coordinated expression of the genes involved in N assimilation and carbon fixation and consequently enhances the NUE of rice GRVs, thereby improving our ability to grow crops sustainably (Li et al., 2018). However, current understanding of the genetic basis for improving NUE remains at the level of identification of a number of quantitative trait loci (QTLs), without any understanding of the nature of the gene products.展开更多
文摘GRV 90027 is a Martian lherzolitic shergottites （L-S） containing poikilitic, non-poikilitic, and melted pocket components. GRV 99027 is mainly composed of olive （55 vol% ） and pyroxene （37.5 vol% ）, with minor maskelynite （6 vol% ） and chromite （ 1.5 vol% ）, and trace whitelockite and troilite, ect. In this paper, the mineralogy and petrology of GRV 99027 are reported; in addition, the geochemical characteristics of the REEs and H isotopes in the GRV 99027 are also further investigated. The 2REE in GRV 99027 is relatively low; HREEs are enriched in olivine and pyroxene grains; LREEs are enriched in plagioclase with a high positive Eu anomaly. High EREE value is found in rare mineral whitlockite （less than 0. 2 vol% ）, LREE ≈ HREE, and whitlockite has a negative Eu anomaly. The REE distribution patterns of the whole -rock of GRV 99027 is similar to but different from that of other L-S Martian meteorites, indicating that they came from different location of Mars. GRV 99027 has a high 8D value. Different water-bearing minerals give different contribution for 8D value. The 8D of phosphates generally does not correlate with water content, and 8D has a weak negative correlation with water content. GRV 99027 can be classified as an L-S Martian meteorite based on mineralogical assemblage patterns, REE distribution patterns, and hydrogen isotope. The isotope data of Sr, Nd, Pb, Os and REE from other L-S Martian meteorites were collected to discuss the formation history of the GRV 99027. Similar to other L-S Martian meteorites, GRV 99027 originated from part of Mar＇s mantle; during one strong impact event about 4M years ago, the meteorites were ejected from deep mantle into space, and traveled for a different duration in space （indicated by different cosmic exposure time）, and captured by the Earth later in different time, ultimately falling on the Antarctica as L-S Martian meteorites.
基金National Natural Science Foundation of China (Grant Nos. 40673054 and 40232026)
文摘We have determined the concentrations of 10Be and 26Al in GRV 99027 recovered by the 16th Chinese Antarctic expedition team, which are 14.1 ± 0.6 dpm/kg and 67.5 ± 3.4 dpm/kg, respectively. From the concentration of 10Be, we calculate a cosmic-ray exposure age of 4.4 ± 0.6 Ma for GRV 99027. The concentration of 26Al is too high compared to the 10Be exposure age, indicating extra production from solar ray. The exposure ages, petrologic and geochemical characteristics of mantle-derived Martian meteorites GRV 99027, LEW 88516, Y-793605, NWA 1950 and ALHA77005 are very similar, suggesting that these meteorites most probably were ejected from Mars in the same impact event.
基金supported by the National Natural Science Foundation of China(Grant No.40232026).
文摘We report the petrography, mineral chemistry and oxygen isotopic composition of GRV 99027, a new Mar-tian meteorite recently collected during the 16th Chinese Antarctic Research Expedition. This meteorite consists of two textural regions. The interstitial region is characterized by the presence of plagioclase and phosphate, and higher FeO contents of olivine and orthopyroxene, in comparison with the poikilitic region. All of the observations are similar to the three known Martian lherzolites. We classify GRV 99027 as the fourth sample of Martian lherzolite.
文摘目的探讨卒中患者肠内营养喂养不耐受(enteral nutrition feeding intolerance,ENFI)的影响因素。方法选取建库至2024年12月中国知网、万方、维普、Cochrane library、Embase、PubMed、Web of Science、SinoMed等数据库发表的探讨卒中患者ENFI的中英文队列研究和病例对照研究。对所有文献进行整理和分析,使用纽卡斯尔-渥太华量表(Newcastle-Ottawa-scale,NOS)评估文献质量,并对卒中患者ENFI的影响因素进行meta分析。结果共检索文献1435篇,最终纳入文献15篇,涉及2831例患者;15篇文献NOS评分≥7分,均为高质量文献。Meta分析结果显示,卒中患者ENFI的发生率为42%(95%CI:34%~49%,P<0.05,I^(2)=73%)。年龄≥60岁(OR=3.66,95%CI:2.57~5.22,P<0.001,I^(2)=40%)、血清ALB<35 g/L(OR=6.39,95%CI:4.14~9.84,P<0.001,I^(2)=0)、使用抗生素(OR=3.40,95%CI:2.56~4.53,P<0.001,I^(2)=30%)、使用血管活性药物(OR=3.27,95%CI:2.02~5.30,P<0.001,I^(2)=0)、亚低温治疗(OR=3.57,95%CI:1.59~7.98,P=0.002,I^(2)=0)、机械通气(OR=3.02,95%CI:2.28~4.01,P<0.001,I^(2)=0)、急性生理和慢性健康状况评价Ⅱ(acute physiology and chronic health evaluationⅡ,APACHEⅡ)评分越高(OR=3.07,95%CI:1.89~4.97,P<0.001,I^(2)=32%)、美国国立卫生研究院卒中量表(National Institutes Health Stroke Scale,NIHSS)评分越高(OR=1.10,95%CI:1.05~1.16,P<0.001,I^(2)=49%)、格拉斯哥昏迷评分(Glasgow coma scale,GCS)越低(OR=2.07,95%CI:1.18~3.63,P=0.01,I^(2)=72%)、肠道感染(OR=3.24,95%CI:1.25~8.40,P=0.02,I^(2)=64%)、喂养速度>100 ml/H(OR=3.77,95%CI:1.73~8.23,P<0.001,I^(2)=60%)的卒中患者,其ENFI的发生风险较高,添加益生菌(OR=0.36,95%CI:0.25~0.53,P<0.001,I^(2)=0)和添加膳食纤维(OR=0.24,95%CI:0.14~0.40,P<0.001,I^(2)=0)的卒中患者,ENFI的发生风险较低。结论ENFI受疾病严重程度、临床干预措施等多方面影响。临床实践中应重点识别高龄、低蛋白血症、抗生素使用、机械通气等因素,并积极采用益生菌与膳食纤维等保护性干预措施。建议医护人员结合胃残余量、腹部体征及相关实验室指标,对高风险患者实施早期、动态评估与个体化营养管理,以有效预防ENFI的发生。
基金supported by grants from the National Natural Science Foundation of China (31830082)the National Key Research and Development Program of China (2016YFD0100401)the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB27010000)
文摘Rice is one of the most important cereal crops in the world, and a substantial increase in grain yield is necessary for food security. However, high yields of semidwarf modern rice varieties are heavily dependent on the application of mineral nitrogenous fertilizer (Tilman et al., 2002;Sun et al., 2014). Nitrogen (N)-insensitive sponses associated with reduced N-use efficiency (NUE) is a major characteristic of the green revolution varieties (GRVs), in which the growth-inhibiting protein SLENDER RICE1 (SLR1) accumulates (Li et al., 2018). Unfortunately, increasing the level of N fertilizer use to reach the full yield potential of GRVs is subject to diminishing returns, quite apart from its deleterious effect on the environments (Rahn et al., 2009;Liu et al., 2015). Therefore, there is an urgent need to develop new rice GRVs that increase NUE while maintaining their high yields. Recently, several genes (e.g., DEP1, OsNRTl.lB, OsNRT2.3b, ARE1 and GRF4) responsible for improved NUE have been identified in rice (Sun et al.. 2014;Hu et al., 2015;Fan et al., 2016;Wang et al., 2018;Li et al., 2018). More importantly, boosting the activity of the transcription factor GRF4 overcomes the ability of SLR1 to prevent the GRF4-GIF1 interaction, which in turn promotes the coordinated expression of the genes involved in N assimilation and carbon fixation and consequently enhances the NUE of rice GRVs, thereby improving our ability to grow crops sustainably (Li et al., 2018). However, current understanding of the genetic basis for improving NUE remains at the level of identification of a number of quantitative trait loci (QTLs), without any understanding of the nature of the gene products.
