期刊文献+
共找到90篇文章
< 1 2 5 >
每页显示 20 50 100
Standardized bioactive fraction of Phaleria macrocarpa(Proliverenol) prevents ethanol-induced hepatotoxicity via down-regulation of NF-kB-TNFα-caspase-8 pathway 被引量:2
1
作者 Guntur Berlian Olivia Mayasari Tandrasasmita Raymond Rubianto Tjandrawinata 《Asian Pacific Journal of Tropical Biomedicine》 SCIE CAS 2016年第8期686-691,共6页
Objective: To verify that Proliverenol has a potential ability in protecting cells from ethanol-induced hepatotoxicity.Methods: Activity of Proliverenol against ethanol-induced apoptosis was evaluated at m RNA and pro... Objective: To verify that Proliverenol has a potential ability in protecting cells from ethanol-induced hepatotoxicity.Methods: Activity of Proliverenol against ethanol-induced apoptosis was evaluated at m RNA and protein levels in Hep G2 cell exposed to Proliverenol for 1 and 3 h.Results: Proliverenol conferred hepatoprotective activity through increasing cell survival up to 53%–69% via up-regulation of APEX1 DNA repair enzyme for 3.0–4.7 fold and down-regulating of nuclear factor-kB, tumor necrosis factora and caspase-8 expression,allowing them to prevent 4.5–6.9 fold of alanine aminotransferase(ALT) leakage in Hep G2 cells. Our finding revealed that Proliverenol repressed expression of ALT, which is significantly important as possible alternative mechanism for increased blood transaminase activities. In addition, the result also showed that caspase-8 pathway seemed to be involved in the molecular pathway rather than directly inducing mitochondrial damage.Conclusions: The data support our hypothesis that Proliverenol has a potential ability in protecting cells from ethanol-induced hepatotoxicity. We propose that Proliverenol provides hepatoprotective activity through up-regulating expression of APEX1 that repress DNA fragmentation, and down-regulating expression of nuclear factor-kB, tumor necrosis factora and caspase-8, which therefore repress ALT leakage and its expression. 展开更多
关键词 Phaleria macrocarpa Hepatoprotector Liver injury CIRRHOSIS HepG2
暂未订购
Potential Technological Use of Reserves of <i>Jatropha curcas</i>and <i>J. macrocarpa</i>Griseb. Seeds 被引量:2
2
作者 Nancy E. de las M. Tavecchio Marta S. Dardanelli +4 位作者 Yanina B. Reguera Herminda E. Reinoso Oscar A. Terenti Marisa M. Garbero Hilda E. Pedranzani 《American Journal of Plant Sciences》 2019年第8期1444-1456,共13页
J. curcas and J. macrocarpa are useful for restoring degraded areas and their seeds contain oils for biodiesel production. The aim of the work was to determine the reserve substances in the endosperm and the embryo of... J. curcas and J. macrocarpa are useful for restoring degraded areas and their seeds contain oils for biodiesel production. The aim of the work was to determine the reserve substances in the endosperm and the embryo of J. curcas and J. macrocarpa which is important in understanding the germination process, the establishment of these species and its industrial employment. Seeds were imbibed in distilled water for 24 h, to facilitate removal of seed coat with the aim to separate the embryo and nutritive tissues. In both species, the endosperm contained aleurone grains consisting of a crystalloid and globoid, lipids of red color and the starch was not observed. Four major fatty acids were determined in J. curcas seed: oleic, palmitic, stearic, palmitoleic and oleic fatty acid represents about 70% oil content. Oleic acid was the most abundant in J. macrocarpa seeds, while, there was not palmitoleic acid. Seed with predominantly unsaturated fatty acids is ideal for biodiesel industry. The means of the sugar content were: 14.3 μg/mg in endosperm and 104.76 μg/mg in embryo of J. curcas and 6.48 μg/mg in endosperm and 59.20 μg/mg in embryo of J. macrocarpa. The means of the protein content were: 4.2 μg/mg in endosperm and 45.02 μg/mg in embryo of J. curcas and 3.26 μg/mg in endosperm and 31.08 μg/mg in embryo of J. macrocarpa. Sugar and protein contents of Jatropha seeds were significantly higher in embryo in both species (p 0.1), which suggests early mobilization towards the embryo during imbibition period. 展开更多
关键词 Fatty Acids J. curcas J. macrocarpa Proteins SEEDS Sugars
暂未订购
Production of secondary metabolite E2.2 from Phaleria macrocarpa endophytic fungus
3
作者 Beatrix Trikurnia Gasong Raymond Rubianto Tjandrawinata 《Asian Pacific Journal of Tropical Biomedicine》 SCIE CAS 2016年第10期881-885,共5页
Objective: To isolate new endophytic fungus from Phaleria macrocarpa(P. macrocarpa)that is able to produce E2.2 compound.Methods: Endophytic fungi were isolated from P. macrocarpa. Morphological and molecular identifi... Objective: To isolate new endophytic fungus from Phaleria macrocarpa(P. macrocarpa)that is able to produce E2.2 compound.Methods: Endophytic fungi were isolated from P. macrocarpa. Morphological and molecular identification was done to determine the species of the endophytic fungus.High performance liquid chromatography was used to determine the ability of this fungus to produce E2.2 compound and to quantify the total yield of E2.2 from fungal fermentation. Fermentation process was optimized by observing suitable medium, p H and length of fermentation process. Phloroglucinol and gallic acid addition were examined to determine the effect of each compound on E2.2 production.Results: One endophytic fungus was successfully isolated from P. macrocarpa plant.Morphological and molecular identification showed that it was a Colletotrichum gloeosporioides which belonged to Glomerellaceae family. This fungus showed highest production of E2.2 when incubated in potato dextrose broth with initial p H value of the medium at 5, and was incubated for 15 days. Phloroglucinol was found to better enhance E2.2 production.Conclusions: Colletotrichum gloeosporioides found in P. macrocarpa plant is promising as a potential alternative source of E2.2. 展开更多
关键词 ENDOPHYTIC FUNGI Phaleria macrocarpa SECONDARY METABOLITE COLLETOTRICHUM gloeosporioides E2.2
暂未订购
Evaluation of L-dopa,proximate composition with in vitro anti-inflammatory and antioxidant activity of Mucuna macrocarpa beans:A future drug for Parkinson treatment
4
作者 Chetan Aware Ravishankar Patil +3 位作者 Swaroopsingh Gaikwad Shrirang Yadav Vishwas Bapat Jyoti Jadhav 《Asian Pacific Journal of Tropical Biomedicine》 SCIE CAS 2017年第12期1097-1106,共10页
Objective: To investigate L-3, 4-dihydroxyphenylalanine(L-dopa, anti-Parkinson drug),anti-inflammatory activity, proximate nutritional composition and antioxidant potential of Mucuna macrocarpa(M. macrocarpa) beans.Me... Objective: To investigate L-3, 4-dihydroxyphenylalanine(L-dopa, anti-Parkinson drug),anti-inflammatory activity, proximate nutritional composition and antioxidant potential of Mucuna macrocarpa(M. macrocarpa) beans.Methods: L-dopa content was determined and quantified by high performance thin layer chromatography and reversed phase high-performance liquid chromatography(RPHPLC) methods. Anti-inflammatory activity was performed by in vitro protein denaturation inhibition and human red blood cell membrane stabilisation activity. Proximate composition and elemental analysis were also investigated. The antioxidant potential(2,2-diphenyl-1-picrylhydrazyl, N-N-dimethyl-phenylenediamine and ferric-reducing antioxidant power) of M. macrocarpa beans were evaluated by using different extraction solvents. The RP-HPLC analysis also quantified significant phenolics such as gallic acid, tannic acid, p-hydroxybenzoic acid and p-coumaric acid.Results: RP-HPLC quantification revealed that M. macrocarpa beans contain a high level of L-dopa [(115.41 ± 0.985) mg/g] which was the highest among the Mucuna species from Indian sub-continent. Water extract of seed powder showed strong antiinflammatory and antioxidant potential. Proximate composition of M. macrocarpa beans revealed numerous nutritional and anti-nutritional components. RP-HPLC analysis of major phenolics such as tannic acid(43.795 mg/g), gallic acid(0.864 mg/g), p-coumaric acid(0.364 mg/g) and p-hydroxybenzoic acid(0.036 mg/g) quantified successfully from M. macrocarpa beans respectively.Conclusions: This study suggests that M. macrocarpa is a potential source of L-dopa with promising anti-inflammatory, antioxidant and nutritional benefits. 展开更多
关键词 ANTI-INFLAMMATORY Antioxidants L-DOPA Mucuna macrocarpa Oxidative stress Parkinson’s disease
暂未订购
Inhibition of Mahkota Dewa(Phaleria macrocarpa) bioactive fraction on proliferation of human retinoblastoma tumor cells Y-79 through suppression of mRNA level of cyclin E
5
作者 Nugroho Trilaksana Ignatius Riwanto +1 位作者 Raymond Rubianto Tjandrawinata Reki Winarto 《Asian Pacific Journal of Tropical Biomedicine》 SCIE CAS 2017年第4期280-287,共8页
Objective: To prove the molecular mechanisms of Mahkota Dewa(Phaleria macrocarpa) in suppressing proliferation of human retinoblastoma cells through suppression of cell cycle's gene-regulators expression.Methods: ... Objective: To prove the molecular mechanisms of Mahkota Dewa(Phaleria macrocarpa) in suppressing proliferation of human retinoblastoma cells through suppression of cell cycle's gene-regulators expression.Methods: In this study, the molecular mechanism of anti-tumor effect of fractioned extract of Phaleria macrocarpa(DLBS1425) in human retinoblastoma cells Y-79 was investigated by measuring the tumor cells viability, the assessment of population profiles of tumor cells in the cell cycle, and the mRNA concentration of p16, p21, p53, cyclin D,cyclin E, and E2 F.Results: DLBS1425 showed an inhibition effects towards proliferation of Y-79 cell line.Inhibition of proliferation was shown by suppression of cell cycle progression.DLBS1425 downregulated cyclin E, a G1 phase regulator gene of cell cycle, in dosedependent manner without affecting p53–p21 pathway.In the other word, DLBS1425 inhibits cell proliferation through suppression of cyclin E independently towards conventional proliferation pathway.Conclusions: Our results suggest that DLBS1425 is a potential anticancer agent which targets genes involved in cell proliferation in human retinoblastoma cells which make it pharmacologically ideal for the prevention and/or treatment of retinoblastoma cancer. 展开更多
关键词 Phaleria macrocarpa Mahkota Dewa DLBS1425 RETINOBLASTOMA Cyclin E Cell cycle
暂未订购
Isolation and identification of compounds from Phaleria macrocarpa(Scheff.) Boerl fruit extract
6
作者 Emanuel Dani Ramdani Ujiatmi Dwi Marlupi +1 位作者 James Sinambela Raymond Rubianto Tjandrawinata 《Asian Pacific Journal of Tropical Biomedicine》 SCIE CAS 2017年第4期300-305,共6页
Objective: To identify and isolate the chemical compounds of Phaleria macrocarpa(P.macrocarpa) fruit ethanolic extract.Methods: Dried fruit of P.macrocarpa was extracted with 90% ethanol and partitioned between n-hexa... Objective: To identify and isolate the chemical compounds of Phaleria macrocarpa(P.macrocarpa) fruit ethanolic extract.Methods: Dried fruit of P.macrocarpa was extracted with 90% ethanol and partitioned between n-hexane/H_2O and ethyl acetate/H_2O.The organic layer was fractionated by various stationary phase and identified by using combined data of 1D [(proton nuclear magnetic resonance(NMR), carbon-13 NMR)], 2D-NMR(heteronuclear multiplequantum correlation and heteronuclear multiple-bond correlation), and mass spectrum.Results: Purification of n-hexane and ethyl acetate fractions from ethanolic extract of P.macrocarpa fruit resulted in isolation of nine compounds.Conclusions: A new compound was isolated and identified as glyceryl pentacosanoate.Also, two xanthones, which are 1,7-dihydroxy-3,6-dimethoxyxanthone and 1,6,7-trihydroxy-3-methoxyxanthone, are firstly reported to be isolated from P.macrocarpa. 展开更多
关键词 Phaleria macrocarpa Glyceryl pentacosanoate 1 7-Dihydroxy-3 6-dimethoxyxanthone 1 6 7-Trihydroxy-3-methoxyxanthone
暂未订购
Comparison of solvents for extraction of Pachira macrocarpa(Cham.et Schlecht.)Walp seed oils
7
作者 Wenhui Zhang Xixiang Shuai +5 位作者 Taotao Dai Lizhen Deng Ruihong Liang Chengmei Liu Jun Chen Mingshun Chen 《Food Bioscience》 SCIE 2023年第1期464-471,共8页
This study compared the lipid yield,chemical composition,thermal and rheological behavior of Pachira macrocarpa seed oil(PSO)extracted with five different solvents(petroleum ether,n-hexane,ethyl acetate,isopropanol an... This study compared the lipid yield,chemical composition,thermal and rheological behavior of Pachira macrocarpa seed oil(PSO)extracted with five different solvents(petroleum ether,n-hexane,ethyl acetate,isopropanol and Folch solution(methanol/chloroform,v/v=1:2)).The results showed that the lipid yield of PSO extracted with ethyl acetate was the highest(29.25%).The main fatty acids of PSOs extracted by different solvents were palmitic acid(48.82-49.24%),linoleic acid(31.23-31.62%)and oleic acid(13.88-14.26%).Ethyl acetate was the most suitable solvent for extracting phytosterols(1756.43 mg/kg),n-hexane was the best solvent for enriching squalene(906.50 mg/kg),and isopropanol extraction was the most suitable for enriching tocopherols(436.90 mg/kg).Folch solution extraction can efficiently extract polyphenols and its oil had the best oxidative stability in all samples.Furthermore,PSOs showed high thermal stability and exhibited Newtonian flow behavior.Overall,this study provides guidance for the industrial production of PSO,and Folch solution extraction was the most suitable method for the development of PSO for the potential healthcare application. 展开更多
关键词 Pachira macrocarpa seed oil SOLVENT Chemical composition Thermal behavior Rheological behavior Application
原文传递
Phytochemical and toxicity evaluation of Phaleria macrocarpa(Scheff.)Boerl by MCF-7 cell line and brine shrimp lethality bioassay
8
作者 Abul Kalam Azad Wan Mohd Azizi Wan Sulaiman Nushrat Khan Sunzida 《Journal of Coastal Life Medicine》 2016年第1期45-49,共5页
Objective:To evaluate the cytotoxicity of Phaleria macrocarpa fruits extracts.Methods:The cytotoxicity test was carried out by in vitro MCF-7 cell line and in vivo brine shrimp lethality bioassay.Results:The prelimina... Objective:To evaluate the cytotoxicity of Phaleria macrocarpa fruits extracts.Methods:The cytotoxicity test was carried out by in vitro MCF-7 cell line and in vivo brine shrimp lethality bioassay.Results:The preliminary phytochemical test showed the presence of alkaloids,carbohydrate,glycosides,saponin,terpene,steroids,phenols and flavonoids.The MTT-assay results showed that the highest percentage of cell viability was 106.23%at concentration of 1.25μL and the lowest percentage was 13.04%at concentration of 10μL.Conclusions:The MTT-assay and brine shrimp lethality bioassay results showed that the extract was non-toxic and it would be consumable as a herbal remedy. 展开更多
关键词 MCF-7 Phaleria macrocarpa Brine shrimp lethality bioassay TOXICITY
原文传递
西双版纳国家级自然保护区勐养子保护区藤枣分布及保育研究
9
作者 李金荣 杨东军 +1 位作者 梁姣 刘浪 《林业建设》 2025年第3期70-74,共5页
通过文献查阅、走访调查及实地调查的方式,对西双版纳勐养子保护区内47条样线进行藤枣分布调查,并对藤枣生长的土壤理化性质以及藤枣的保育方式开展研究。结果表明:47条样线中共有7个地点发现7个种群122株藤枣,7个样点土壤有机质含量均... 通过文献查阅、走访调查及实地调查的方式,对西双版纳勐养子保护区内47条样线进行藤枣分布调查,并对藤枣生长的土壤理化性质以及藤枣的保育方式开展研究。结果表明:47条样线中共有7个地点发现7个种群122株藤枣,7个样点土壤有机质含量均较高,pH值均为弱酸性,pH范围在4.89~6.44之间,其中5个样点土壤有机质含量均在20 g/kg以上,藤枣喜在土壤有机质含量较高且呈弱酸性土壤环境中生长。大荒坝南木河土壤中氮磷钾总量最高,为26.17 g/kg,昆罕小寨最低,为7.0420 g/kg,土壤中氮磷钾总量对藤枣分布数量并无直接关系。新鲜水苔做为基质的扦插繁育中获得5株成活株,成活率为12%。 展开更多
关键词 藤枣 西双版纳国家级自然保护区勐养子保护区 极小种群物种 植物分布 植物保育
原文传递
滇西北海拔上限大果红杉径向生长对气候变化的响应 被引量:21
10
作者 张贇 尹定财 +4 位作者 田昆 肖德荣 孙梅 王行 张卫国 《应用生态学报》 CAS CSCD 北大核心 2017年第9期2805-2812,共8页
基于树轮年代学方法,利用玉龙雪山、哈巴雪山和普达措国家公园海拔上限大果红杉树轮宽度资料,分别建立3个样点大果红杉的差值年表(RES),研究其径向生长对气候响应的异同,探讨影响滇西北大果红杉生长的关键气候因子.结果表明:生长季初期(... 基于树轮年代学方法,利用玉龙雪山、哈巴雪山和普达措国家公园海拔上限大果红杉树轮宽度资料,分别建立3个样点大果红杉的差值年表(RES),研究其径向生长对气候响应的异同,探讨影响滇西北大果红杉生长的关键气候因子.结果表明:生长季初期(5月和6月)温度是影响滇西北大果红杉生长的主要因子,与3个样点的径向生长表现出显著正相关关系,同时普达措国家公园大果红杉还受生长季以前温度的影响,分别与上年7月和11月温度呈显著负相关和显著正相关;3个样点大果红杉生长对降水的响应存在差异,随着纬度升高主要由负相关转为正相关,大果红杉径向生长与降水的关系在玉龙雪山(纬度梯度最南)主要表现为与生长季初期降水量呈显著负相关,在哈巴雪山(纬度梯度中部)表现为与9月降水量呈显著负相关,在普达措国家公园(纬度梯度最北)表现为与3月降水量呈显著正相关.另外,7月降水的增多有利于玉龙雪山大果红杉的生长.基于气候模型预测,综合大果红杉对温度和降水响应模式与响应程度分析,未来气候变化有利于滇西北高原大果红杉的径向生长. 展开更多
关键词 大果红杉 树木年轮 气候响应 海拔分布上限 滇西北高原
原文传递
大果冬青种子的休眠与萌发初探 被引量:28
11
作者 徐本美 史晓华 +1 位作者 孙运涛 黎念林 《种子》 CSCD 北大核心 2002年第3期1-2,5,共3页
大果冬青的种壳占种子风干重的 75 % ,种子透水性良好。浓硫酸处理 1.5小时后 ,可使种壳减轻 32 .6 %。酸蚀处理增强了种子的透气性并减轻了种壳的机械束缚力。添加 2 5 0 mg· L- 1 +0 .2 % KNO3溶液 ,经过一个冬天层积后 ,发芽率... 大果冬青的种壳占种子风干重的 75 % ,种子透水性良好。浓硫酸处理 1.5小时后 ,可使种壳减轻 32 .6 %。酸蚀处理增强了种子的透气性并减轻了种壳的机械束缚力。添加 2 5 0 mg· L- 1 +0 .2 % KNO3溶液 ,经过一个冬天层积后 ,发芽率可达17.1% 。 展开更多
关键词 大果冬青 种子 休眠 萌发 硫酸处理 冷层积 GA3
在线阅读 下载PDF
瓜栗病原真菌的鉴定 被引量:13
12
作者 习平根 戚佩坤 姜子德 《华南农业大学学报》 CAS CSCD 北大核心 2000年第4期30-32,共3页
鉴定了广州地区瓜栗 [Pachiramacrocarpa (Cham .et.Schlecht.)Walp .]上 8种病原真菌 ,即大果拟茎点霉 (Pho mopsismacrocarpaeP .G .Xi,Z .D .JiangetP .K .Chisp .nov .)、榴莲拟茎点霉 (PhomopsisdurionisH .Syd .)、可可球二孢 (Bo... 鉴定了广州地区瓜栗 [Pachiramacrocarpa (Cham .et.Schlecht.)Walp .]上 8种病原真菌 ,即大果拟茎点霉 (Pho mopsismacrocarpaeP .G .Xi,Z .D .JiangetP .K .Chisp .nov .)、榴莲拟茎点霉 (PhomopsisdurionisH .Syd .)、可可球二孢 (BotryodiplodiatheobromaePat.)、胶孢刺盘孢 [Colletotrichumgloeosporioides (Penz.)Sacc .]、木止木拟盘多毛孢[Pestalotiopsisgracilis (Kleb .)Stey .]、粉红聚端孢 (TrichotheciumroseumLk .exFr.)、新月弯孢霉 [Curvularialunata(Walk .)Boed .]和细极链格孢 [Alternariatenuissima (Fr.)Wiltsh .],其中榴莲拟茎点霉引起的叶斑病和可可球二孢引起的茎枯病在生产上为害较重 展开更多
关键词 瓜栗 病原真菌 种类鉴定 大果拟茎点霉
在线阅读 下载PDF
HPLC法测定藜豆中左旋多巴的含量 被引量:10
13
作者 黄海滨 苏健 谭叶憧 《广西植物》 CAS CSCD 北大核心 2004年第5期460-462,共3页
采用HPLC法建立测定藜豆中左旋多巴含量的方法。色谱柱为岛津C-18甲基硅烷柱(250 min×4.6mm,5μm),流动相为甲醇:0.1 mol/L醋酸溶液(25:75,v/v),以硫唑嘌呤为内标物,检测波长280 nm,流速1.0 mL/min,柱温为室温,供试品的前处理... 采用HPLC法建立测定藜豆中左旋多巴含量的方法。色谱柱为岛津C-18甲基硅烷柱(250 min×4.6mm,5μm),流动相为甲醇:0.1 mol/L醋酸溶液(25:75,v/v),以硫唑嘌呤为内标物,检测波长280 nm,流速1.0 mL/min,柱温为室温,供试品的前处理方法为微波辅助提取法。结果表明,该方法准确度高,线性关系好,重现性好,平均加样回收率为97.34%,RSD 1.01%(n=5),结果满意。 展开更多
关键词 左旋多巴 HPLC法 含量 供试品 硫唑嘌呤 RSD 检测波长 前处理方法 微波辅助提取法 重现性
在线阅读 下载PDF
濒危植物藤枣的生境与种群结构特征 被引量:10
14
作者 刘万德 苏建荣 +4 位作者 徐崇华 王发忠 郎学东 李智宏 李帅锋 《林业科学研究》 CSCD 北大核心 2017年第1期137-144,共8页
[目的]探索藤枣生境及其种群数量、分布、结构及更新等特征。[方法]在藤枣主要分布地设置5块20 m×20m的调查样地,记录样地中所有胸径(DBH)≥1 cm的植物的物种名称、高度、胸径、及样地的郁闭度、海拔、坡度、裸岩覆盖率、距河流距... [目的]探索藤枣生境及其种群数量、分布、结构及更新等特征。[方法]在藤枣主要分布地设置5块20 m×20m的调查样地,记录样地中所有胸径(DBH)≥1 cm的植物的物种名称、高度、胸径、及样地的郁闭度、海拔、坡度、裸岩覆盖率、距河流距离、土壤等环境因子,同时在样地中调查藤枣种群特征,分析藤枣藤枣生境地的林分因子、群落特征、生境特征及种群数量与更新。[结果]表明:藤枣生境地林分平均高、平均胸径、平均胸高断面积、林分密度分别为11.98 m、15.13 cm、41.42 m2·hm-2和1 205株·hm-2。群落平均物种丰富度为35.2,群落类型为热带雨林和季风常绿阔叶林;在大小级结构上,不同高度级和径级内物种丰富度和个体多度均呈单峰曲线,最高值均出现在第Ⅱ高度级和径级内,但第Ⅴ(H≥30 m)高度级和第Ⅵ(DBH≥100 cm)径级均有物种和个体分布。藤枣生境地平均海拔高度为1 107 m,坡度为陡坡,坡向则多数为阴坡,处坡下位置;林分郁闭度仅为76%,但距河流较近(31 m),并伴有一定的裸露岩石;土壤接近中性(p H=6.2),养分条件较好。在5块调查样地(面积20 m×20 m)中,共有藤枣28株,分布于19个样方,多数为单方单株分布。28株藤枣平均长度2.39 m,平均基径仅为0.74 cm,平均胸径为0.41 cm。其中,更新幼苗(H<33 cm)为3株,占藤枣总株数的10.71%。[结论]藤枣分布地植物群落类型主要为热带雨林和季风常绿阔叶林,树木较高,树体较大,单峰曲线是其物种丰富度和个体多度在不同高度级和径级内的分布形式。生境地环境以高温高湿为主,土壤养分条件较好。28株藤枣分布于19个样方,多数为单方单株分布。藤枣幼苗数量较少,自然更新受限。 展开更多
关键词 林分因子 群落特征 生境特征 更新 藤枣
在线阅读 下载PDF
马拉巴栗疫病病原的分离与鉴定 被引量:6
15
作者 李琳 陈鸿宇 +2 位作者 柳凤 何红 余莎 《园艺学报》 CAS CSCD 北大核心 2011年第12期2395-2400,共6页
2008—2009年,从广东省湛江等地采集疑似疫病的马拉巴栗病株,经病原菌分离及柯赫氏法则验证,证明其病原菌是疫霉菌。通过致病性、寄主范围测定,菌体形态,培养特性及rDNA-ITS序列分析等,将该病原菌初步鉴定为棕榈疫霉(Phytophthora palmi... 2008—2009年,从广东省湛江等地采集疑似疫病的马拉巴栗病株,经病原菌分离及柯赫氏法则验证,证明其病原菌是疫霉菌。通过致病性、寄主范围测定,菌体形态,培养特性及rDNA-ITS序列分析等,将该病原菌初步鉴定为棕榈疫霉(Phytophthora palmivora)。 展开更多
关键词 马拉巴栗 棕榈疫霉 疫病 分离 鉴定
原文传递
从藜豆中提取天然黑色素的工艺研究 被引量:8
16
作者 陈松 韦万兴 +3 位作者 刘志平 周敏 卓家雄 肖世基 《应用化工》 CAS CSCD 2011年第11期1915-1917,共3页
以我国南方资源丰富的藜豆为原料,对藜豆中的天然黑色素提取工艺进行了研究,得出了藜豆黑色素的最佳提取条件:用4%NaOH溶液于60℃超声浸提40 min,调节pH=2,析出黑色素,得率为3.62%。由紫外和红外波谱分析藜豆黑色素具有邻苯二酚型结构。
关键词 藜豆 黑色素 提取
暂未订购
滇西北高山针叶林区主要林型下外生菌根真菌的分布 被引量:21
17
作者 毕国昌 臧穆 郭秀珍 《林业科学》 EI CAS CSCD 北大核心 1989年第1期33-39,共7页
1985年和1986年,我们在云南西北部高山针叶林内,采用标准地调查和路线踏查相结合的方法,在杜鹃-冷杉林等7个主要林型中进行了外生菌根真菌调查。经对采集标本的鉴定,计有33个属约140余种外生菌根真菌。它们在各种林型下的分布有着一定... 1985年和1986年,我们在云南西北部高山针叶林内,采用标准地调查和路线踏查相结合的方法,在杜鹃-冷杉林等7个主要林型中进行了外生菌根真菌调查。经对采集标本的鉴定,计有33个属约140余种外生菌根真菌。它们在各种林型下的分布有着一定的规律。其种类组成和分布的多度与林木的组成、土壤和地形条件,如海拔高度、坡向、坡度等有密切的关系。 展开更多
关键词 高山针叶林 外生菌根真菌 冷杉
在线阅读 下载PDF
国家Ⅰ级重点保护极危植物藤枣研究进展 被引量:6
18
作者 郎学东 徐崇华 +5 位作者 苏建荣 王发忠 李智宏 刘万德 李帅锋 黄小波 《西北植物学报》 CAS CSCD 北大核心 2017年第1期203-210,共8页
国家Ⅰ级重点保护植物藤枣[Eleutharrhena macrocarpa(Diels)Forman]属防己科单种属植物,主要分布于云南南部地区。藤枣因其形态特征和分布式样在防己科植物中较为独特,具有重要的植物系统学和区系地理学研究价值。据相关文献记载,目前... 国家Ⅰ级重点保护植物藤枣[Eleutharrhena macrocarpa(Diels)Forman]属防己科单种属植物,主要分布于云南南部地区。藤枣因其形态特征和分布式样在防己科植物中较为独特,具有重要的植物系统学和区系地理学研究价值。据相关文献记载,目前发现和记录的藤枣自然种群数量小于60株,种群处于极危状态,面临灭绝风险。国内外与藤枣相关的研究资料也相对匮乏。为及时拯救和关注这一濒危物种,该文在前贤研究的基础上,总结报道了藤枣的分类学简史、科学研究价值、自然种群数量、濒危状况、生物多样性保护地位、区系分布、模式标本认定等方面的最新研究进展,提出了近期的研究目标。期望能对藤枣的准确鉴定、精准调查和进一步深入研究提供基础信息和理论参考。 展开更多
关键词 藤枣 研究资料 新整理
在线阅读 下载PDF
科尔沁沙地蒙古黄榆种群结构与空间分布格局 被引量:18
19
作者 张雷 王晓江 +4 位作者 胡尔查 高桂英 庞鑫 于有忠 张振华 《中国沙漠》 CSCD 北大核心 2011年第1期115-120,共6页
对科尔沁沙地分布的蒙古黄榆(Ulmus macrocarpa var.mongolica)疏林进行了调查研究,分析了其群落特征、种群结构和空间分布规律;编制了种群的静态生命表;绘制了年龄结构图、存活曲线和点格局分析图。结果表明:①蒙古黄榆疏林木本层... 对科尔沁沙地分布的蒙古黄榆(Ulmus macrocarpa var.mongolica)疏林进行了调查研究,分析了其群落特征、种群结构和空间分布规律;编制了种群的静态生命表;绘制了年龄结构图、存活曲线和点格局分析图。结果表明:①蒙古黄榆疏林木本层的发育并不完善,种类单一,偶尔出现灌木层;②蒙古黄榆种群的年龄结构极不合理,呈明显的衰退型,并且幼树较少,更不存在0~10 a的幼树,天然更新严重不足,群落正处于严重的退化状态;③蒙古黄榆的种群静态生命表表明,死亡率最高出现在40~50年龄段,幼年个体的死亡率最低,它的存活曲线趋向于DeeveyⅠ型;④蒙古黄榆种群空间分布格局呈随机分布。 展开更多
关键词 蒙古黄榆 种群结构 空间分布格局 疏林 科尔沁沙地
原文传递
科尔沁沙地黄榆种子散布的空间差异及规律 被引量:6
20
作者 杨允菲 白云鹏 李建东 《植物生态学报》 CAS CSCD 北大核心 2012年第8期747-753,共7页
黄榆(Ulmus macrocarpa)是典型的风播植物,在科尔沁沙地可以形成单一优势种林地。通过对其林下随机取样和林缘与孤立树不同方向从树基部向外的有序取样调查,分析了黄榆林下和林缘外不同距离的种子沉降特征、林缘和孤立树种子散布方向的... 黄榆(Ulmus macrocarpa)是典型的风播植物,在科尔沁沙地可以形成单一优势种林地。通过对其林下随机取样和林缘与孤立树不同方向从树基部向外的有序取样调查,分析了黄榆林下和林缘外不同距离的种子沉降特征、林缘和孤立树种子散布方向的差异性与规律性。结果表明,黄榆平均种子密度以林下最大,林缘3m处已显著减小,林缘外随着距离增加黄榆平均种子密度呈指数减少态势,且越远越不均匀。林缘和孤立树不同方向在26m内,单位面积连续分布的种子累积数量均以顺风向频率大的东北方向最多,以逆风向频率大的西南或西方向最少。林缘和孤立树共10个方向的垂直断面从树基部向外的单位面积种子数量频度均符合Weibull分布和对数-正态分布密度函数(χ2(α)<0.900),具有相同的种子散布格局。在科尔沁沙地自然条件下,黄榆在各方向具有相同的"远距离"种子散布机制。 展开更多
关键词 风播植物 孤立树 种子散布 黄榆 林下 林缘
原文传递
上一页 1 2 5 下一页 到第
使用帮助 返回顶部