Documenting morphological features of modem pollen is fundamental for the identification of fossil pollen, which will assist researchers to reconstruct the vegetation and climate of a particular geologic period. This ...Documenting morphological features of modem pollen is fundamental for the identification of fossil pollen, which will assist researchers to reconstruct the vegetation and climate of a particular geologic period. This paper presents the pollen morphol- ogy of 20 species of tundra plants from the high Arctic of Ny-Alesund, Svalbard, using light and scanning electron microscopy. The plants used in this study belong to 12 families： Brassicaceae, Caryophyllaceae, Cyperaceae, Ericaceae, Juncaceae, Papav- eraceae, Poaceae, Polygonaceae, Ranunculaceae, Rosaceae, Salicaceae, and Scrophulariaceae. Pollen grain shapes included： spher- oidal, subprolate, and prolate. Variable apertural patterns ranged from 2-syncolpate, 3-colpate, 3-（-4）-colpate, 3-（-5）-colpate, 3-colporate, 5-poroid, ulcerate, ulcus to pantoporate. Exine ornamentations comprised psilate, striate-perforate, reticulate, mi- croechinate, microechinate-perforate, scabrate, granulate, and granulate-perforate. This study provided a useful reference for com- parative studies of fossil pollen and for the reconstruction of paleovegetation and paleoclimate in Svalbard region of Arctic.展开更多
AIM:To assess NY-ESO-1 expression in a cohort of esophageal adenocarcinomas.METHODS:A retrospective search of our tissue archive for esophageal resection specimens containing esophageal adenocarcinoma was performed,fo...AIM:To assess NY-ESO-1 expression in a cohort of esophageal adenocarcinomas.METHODS:A retrospective search of our tissue archive for esophageal resection specimens containing esophageal adenocarcinoma was performed,for cases which had previously been reported for diagnostic purposes,using the systematised nomenclature of human and veterinary medicine coding system.Original haematoxylin and eosin stained sections were reviewed,using light microscopy,to confirm classification and tumour differentiation.A total of 27 adenocarcinoma resection specimens were then assessed using immunohistochemistry for NY-ESO-1 expression:4 well differentiated,14 moderately differentiated,4 moderatepoorly differentiated,and 5 poorly differentiated.RESULTS:Four out of a total of 27 cases of esophageal adenocarcinoma examined(15%)displayed diffuse cytoplasmic and nuclear expression for NY-ESO-1.They displayed a heterogeneous and mosaic-type pattern of diffuse staining.Diffuse cytoplasmic staining was not identified in any of these structures:stroma,normal squamous epithelium,normal submucosal gland and duct,Barrett’s esophagus(goblet cell),Barrett’s esophagus(non-goblet cell)and high grade glandular dysplasia.All adenocarcinomas showed an unexpected dot-type pattern of staining at nuclear,paranuclear and cytoplasmic locations.Similar dot-type staining,with varying frequency and size of dots,was observed on examination of Barrett’s metaplasia,esophageal submucosal gland acini and the large bowel negative control,predominantly at the crypt base.Furthermore,a prominent pattern of apical(luminal)cytoplasmic dot-type staining was observed in some cases of Barrett’s metaplasia and also adenocarcinoma.A further morphological finding of interest was noted on examination of haematoxylin and eosin stained sections,as aggregates of lymphocytes were consistently noted to surround submucosal glands.CONCLUSION:We have demonstrated for the first time NY-ESO-1 expression by esophageal adenocarcinomas,Barrett’s metaplasia and normal tissues other than germ cells.展开更多
北极夏季无冰区苔原CO_(2)的释放对全球碳循环起着重要的作用。在第4次北极科学考察(2008年7月26日—8月5日)期间,采用密闭箱法在北极新奥尔松(Ny-Ålesund)黄河站区附近的鸟类保护区苔原(Tundra in Seabird Sanctuary,TSB)、普通...北极夏季无冰区苔原CO_(2)的释放对全球碳循环起着重要的作用。在第4次北极科学考察(2008年7月26日—8月5日)期间,采用密闭箱法在北极新奥尔松(Ny-Ålesund)黄河站区附近的鸟类保护区苔原(Tundra in Seabird Sanctuary,TSB)、普通海滩苔原(Tundra in Non-seabird Colony,TNS)和两者间的过渡苔原(Tundra in Transition Zone,TTR)监测CO_(2)净通量(Net CO_(2)Fluxes,NEE)空间变异规律及其影响因素。结果表明:鸟类保护区苔原TSB的平均NEE为(–39.0±6.0)mg·m^(–2)·h^(–1),为CO_(2)吸收汇,且对CO_(2)的吸收随着植被覆盖度和海鸟活动强度的增强而显著增强;普通海滩苔原TNS和过渡苔原TTR的平均NEE分别为(12.0±6.3)mg·m^(–2)·h^(–1)和(40.5±29.3)mg·m^(–2)·h^(–1),均为CO_(2)净排放源。普通海滩苔原TNS的CO_(2)排放强度随土壤水分的减少和地势增高而增强;过渡苔原TTR中高地苔原区的平均NEE为(106.4±23.1)mg·m^(–2)·h^(–1),为CO_(2)强排放源;而泥炭苔原区的平均NEE为(–58.3±9.5)mg·m^(–2)·h^(–1),为CO_(2)强吸收汇。苔原土壤的理化性质对苔原NEE有重要影响,鸟类保护区苔原TSB和普通海滩苔原TNS的NEE与土壤含水率呈显著负相关关系(r=–0.44,P=0.003)。鸟类保护区苔原TSB的NEE与土壤温度弱正相关(r=0.32,P=0.06),与NH4+-N(P<0.05)和NO_(3)^(–)-N(P<0.05)含量均显著负相关。在全球变暖的驱使下,不同地形地貌和海鸟活动特征的北极苔原区域CO_(2)排放的复杂性将显著增强,对全球碳循环产生较大的影响,本研究也将为此提供科研资料。展开更多
The O-C isotope compositions of reef-facies carbonates of NY-1 (Nanyong-1) core in Nansha area can be divided into 4 stages. The average values of δ18O (‰) and δ13C (‰) for the 4 stages are (I) -5.0, -0.5; (11) -7...The O-C isotope compositions of reef-facies carbonates of NY-1 (Nanyong-1) core in Nansha area can be divided into 4 stages. The average values of δ18O (‰) and δ13C (‰) for the 4 stages are (I) -5.0, -0.5; (11) -7.7, -5.3; (III) -6.4, -2.8; (IV) 1.3, 2.1, respectively. The characters of δ18O fluctuating curves of stage II are low frequencies, small amplitudes and corresponding correlation with glacial and mterglacial stages. It has positive correlations between δ18O and δ13C values in stages III and IV, which are genetically related to dolomitization. The characteristics of 4 stages also exist in Δ87Sr and in Pb isotope compositions The maximun. minimum and all the positive values of Δ87Sr in the core of the whole hole occur in stage 11 The characters of frequently changing fluctuation appear in stage IV for both Pb and Sr isotope compositions The lead with high μ values was taken in during dolomitization. The history of palaeoclimatic and palaeoenvironmental changes in Nansha region during展开更多
基金financially supported by the Main Direction Program of Knowledge Innovation of Chinese Academy of Sciences (Grant no.KSCX2-EW-J-1)State Key Laboratory Systematics and Evolutionary Botany,Institute of Botany,Chinese Academy of Sciences (SKLSEB-IBCAS,Grant no.56176G1048)
文摘Documenting morphological features of modem pollen is fundamental for the identification of fossil pollen, which will assist researchers to reconstruct the vegetation and climate of a particular geologic period. This paper presents the pollen morphol- ogy of 20 species of tundra plants from the high Arctic of Ny-Alesund, Svalbard, using light and scanning electron microscopy. The plants used in this study belong to 12 families： Brassicaceae, Caryophyllaceae, Cyperaceae, Ericaceae, Juncaceae, Papav- eraceae, Poaceae, Polygonaceae, Ranunculaceae, Rosaceae, Salicaceae, and Scrophulariaceae. Pollen grain shapes included： spher- oidal, subprolate, and prolate. Variable apertural patterns ranged from 2-syncolpate, 3-colpate, 3-（-4）-colpate, 3-（-5）-colpate, 3-colporate, 5-poroid, ulcerate, ulcus to pantoporate. Exine ornamentations comprised psilate, striate-perforate, reticulate, mi- croechinate, microechinate-perforate, scabrate, granulate, and granulate-perforate. This study provided a useful reference for com- parative studies of fossil pollen and for the reconstruction of paleovegetation and paleoclimate in Svalbard region of Arctic.
文摘AIM:To assess NY-ESO-1 expression in a cohort of esophageal adenocarcinomas.METHODS:A retrospective search of our tissue archive for esophageal resection specimens containing esophageal adenocarcinoma was performed,for cases which had previously been reported for diagnostic purposes,using the systematised nomenclature of human and veterinary medicine coding system.Original haematoxylin and eosin stained sections were reviewed,using light microscopy,to confirm classification and tumour differentiation.A total of 27 adenocarcinoma resection specimens were then assessed using immunohistochemistry for NY-ESO-1 expression:4 well differentiated,14 moderately differentiated,4 moderatepoorly differentiated,and 5 poorly differentiated.RESULTS:Four out of a total of 27 cases of esophageal adenocarcinoma examined(15%)displayed diffuse cytoplasmic and nuclear expression for NY-ESO-1.They displayed a heterogeneous and mosaic-type pattern of diffuse staining.Diffuse cytoplasmic staining was not identified in any of these structures:stroma,normal squamous epithelium,normal submucosal gland and duct,Barrett’s esophagus(goblet cell),Barrett’s esophagus(non-goblet cell)and high grade glandular dysplasia.All adenocarcinomas showed an unexpected dot-type pattern of staining at nuclear,paranuclear and cytoplasmic locations.Similar dot-type staining,with varying frequency and size of dots,was observed on examination of Barrett’s metaplasia,esophageal submucosal gland acini and the large bowel negative control,predominantly at the crypt base.Furthermore,a prominent pattern of apical(luminal)cytoplasmic dot-type staining was observed in some cases of Barrett’s metaplasia and also adenocarcinoma.A further morphological finding of interest was noted on examination of haematoxylin and eosin stained sections,as aggregates of lymphocytes were consistently noted to surround submucosal glands.CONCLUSION:We have demonstrated for the first time NY-ESO-1 expression by esophageal adenocarcinomas,Barrett’s metaplasia and normal tissues other than germ cells.
文摘北极夏季无冰区苔原CO_(2)的释放对全球碳循环起着重要的作用。在第4次北极科学考察(2008年7月26日—8月5日)期间,采用密闭箱法在北极新奥尔松(Ny-Ålesund)黄河站区附近的鸟类保护区苔原(Tundra in Seabird Sanctuary,TSB)、普通海滩苔原(Tundra in Non-seabird Colony,TNS)和两者间的过渡苔原(Tundra in Transition Zone,TTR)监测CO_(2)净通量(Net CO_(2)Fluxes,NEE)空间变异规律及其影响因素。结果表明:鸟类保护区苔原TSB的平均NEE为(–39.0±6.0)mg·m^(–2)·h^(–1),为CO_(2)吸收汇,且对CO_(2)的吸收随着植被覆盖度和海鸟活动强度的增强而显著增强;普通海滩苔原TNS和过渡苔原TTR的平均NEE分别为(12.0±6.3)mg·m^(–2)·h^(–1)和(40.5±29.3)mg·m^(–2)·h^(–1),均为CO_(2)净排放源。普通海滩苔原TNS的CO_(2)排放强度随土壤水分的减少和地势增高而增强;过渡苔原TTR中高地苔原区的平均NEE为(106.4±23.1)mg·m^(–2)·h^(–1),为CO_(2)强排放源;而泥炭苔原区的平均NEE为(–58.3±9.5)mg·m^(–2)·h^(–1),为CO_(2)强吸收汇。苔原土壤的理化性质对苔原NEE有重要影响,鸟类保护区苔原TSB和普通海滩苔原TNS的NEE与土壤含水率呈显著负相关关系(r=–0.44,P=0.003)。鸟类保护区苔原TSB的NEE与土壤温度弱正相关(r=0.32,P=0.06),与NH4+-N(P<0.05)和NO_(3)^(–)-N(P<0.05)含量均显著负相关。在全球变暖的驱使下,不同地形地貌和海鸟活动特征的北极苔原区域CO_(2)排放的复杂性将显著增强,对全球碳循环产生较大的影响,本研究也将为此提供科研资料。
基金Report D-00044 of The Multidisciplinary Oceanographic Expedition Team of Chinese Academy of Sciences to tbe Nansha Archipelago. Part of funds was supported by the National Natural Science Foundation of China.
文摘The O-C isotope compositions of reef-facies carbonates of NY-1 (Nanyong-1) core in Nansha area can be divided into 4 stages. The average values of δ18O (‰) and δ13C (‰) for the 4 stages are (I) -5.0, -0.5; (11) -7.7, -5.3; (III) -6.4, -2.8; (IV) 1.3, 2.1, respectively. The characters of δ18O fluctuating curves of stage II are low frequencies, small amplitudes and corresponding correlation with glacial and mterglacial stages. It has positive correlations between δ18O and δ13C values in stages III and IV, which are genetically related to dolomitization. The characteristics of 4 stages also exist in Δ87Sr and in Pb isotope compositions The maximun. minimum and all the positive values of Δ87Sr in the core of the whole hole occur in stage 11 The characters of frequently changing fluctuation appear in stage IV for both Pb and Sr isotope compositions The lead with high μ values was taken in during dolomitization. The history of palaeoclimatic and palaeoenvironmental changes in Nansha region during
