期刊文献+
共找到13篇文章
< 1 >
每页显示 20 50 100
布氏田鼠非取食性牧草消耗量的测定 被引量:8
1
作者 宛新荣 王广和 钟文勤 《生态学杂志》 CAS CSCD 北大核心 2001年第4期77-78,76,共3页
By analyzing the field population of Brandt’s vole,it reveals that the daily non-feeding grass consumption is about 2.81g (in dry) or 7.22g (in fresh) per vole.There is about 11 percent of the gnawed grass will be re... By analyzing the field population of Brandt’s vole,it reveals that the daily non-feeding grass consumption is about 2.81g (in dry) or 7.22g (in fresh) per vole.There is about 11 percent of the gnawed grass will be re-utilized by the vole within 24 hours.The non-feeding grass consumption of this species is much more lower than its daily food consumption. 展开更多
关键词 布氏田鼠 取食性牧草消耗量 食量 食性
下载PDF
11种植物提取物对枸杞蚜虫的拒食和毒杀活性测定 被引量:22
2
作者 张建英 杨贵军 +1 位作者 于有志 杨乐 《农业科学研究》 2007年第1期21-23,共3页
测定了11种植物乙醇提取物对枸杞蚜虫的拒食和毒杀活性,结果表明:苍耳、钩腺大戟、蒺藜、狼毒和伏毛铁棒锤提取液对枸杞蚜虫具有明显的拒食活性,狼毒、蒺藜和葫芦巴提取液处理枸杞蚜虫72 h,校正死亡率达90%以上,其中狼毒毒杀活性最强.
关键词 植物提 枸杞蚜虫 拒食活性 触杀活性
下载PDF
一种促进蜜蜂蜂群增长的营养饲料配方 被引量:4
3
作者 余玉生 张祖芸 +2 位作者 王艳辉 卢焕仙 张学文 《南方农业学报》 CAS CSCD 北大核心 2014年第7期1272-1275,共4页
[目的]筛选出适合蜜蜂繁殖季节饲喂的营养饲料配方,丰富蜜蜂营养生理学理论.[方法]以蜜蜂的取食性和蜂群增殖效果为考察指标,分别于2009年8月25日~10月9日和2010年8月13日~10月22日进行不同营养饲料对蜜蜂蜂群增长效果的影响研究.[结... [目的]筛选出适合蜜蜂繁殖季节饲喂的营养饲料配方,丰富蜜蜂营养生理学理论.[方法]以蜜蜂的取食性和蜂群增殖效果为考察指标,分别于2009年8月25日~10月9日和2010年8月13日~10月22日进行不同营养饲料对蜜蜂蜂群增长效果的影响研究.[结果]在2009年的蜂群秋繁试验中,以花粉+新鲜乳品+糖粉的营养饲料配方效果最佳,其蜂群取食率达100.00%,蜂群群势增殖49.24%;而花粉+土霉素+糖水的效果最差,其蜂群取食率仅74.88%,蜂群群势增殖-10.28%.在2010年的蜂群秋繁试验中,同样以花粉+新鲜乳品+糖粉的营养饲料配方效果最佳,其蜂群取食率94.64%,蜂群群势增殖37.01%.[结论]花粉+新鲜乳品+糖粉是一种能有效促进蜜蜂蜂群增长的营养饲料配方. 展开更多
关键词 蜜蜂 营养饲料 蜂群群势增殖 取食性
下载PDF
美洲斑潜蝇寄主选择性的初步研究 被引量:7
4
作者 戴小华 尤民生 傅丽君 《山东农业大学学报(自然科学版)》 CSCD 北大核心 2003年第2期202-205,共4页
运用方差分析和聚类分析 ,系统研究了美洲斑潜蝇对豆科、葫芦科、茄科、十字花科和菊科作物的选择性差异 ,对同科不同种作物的选择性差异 ,以及对豇豆不同品种的选择性差异。结果表明 ,美洲斑潜蝇能够在所有供试作物上取食和产卵 ;美洲... 运用方差分析和聚类分析 ,系统研究了美洲斑潜蝇对豆科、葫芦科、茄科、十字花科和菊科作物的选择性差异 ,对同科不同种作物的选择性差异 ,以及对豇豆不同品种的选择性差异。结果表明 ,美洲斑潜蝇能够在所有供试作物上取食和产卵 ;美洲斑潜蝇寄主选择性不仅可能存在科、属、种间差异 ,也可能存在变种和品种差异 ;美洲斑潜蝇对不同科作物的选择顺序为 :豆科、葫芦科、茄科、十字花科和菊科。 展开更多
关键词 美洲斑潜蝇 寄主选择性 方差分析 聚类分析 作物种类 取食性 产卵 品种差异
下载PDF
Difference in volatiles of poplar induced by various damages 被引量:1
5
作者 胡增辉 杨迪 沈应柏 《Journal of Forestry Research》 SCIE CAS CSCD 2004年第4期280-282,共3页
Three treatments including mechanical damage, Lymantria dispar attacking and daubing oral secretions of the in-sects on mechanically damaged cut were conducted on Populus simonii譖opulus pyramibalis c.v. in order to f... Three treatments including mechanical damage, Lymantria dispar attacking and daubing oral secretions of the in-sects on mechanically damaged cut were conducted on Populus simonii譖opulus pyramibalis c.v. in order to find the genuine reason leading to effective resistance response of tree to insects attacking. The release situation of the induced volatiles of the plant was analyzed by TCT-GC/MS at 24 hours after damages. The results indicated that some of the volatiles such as (Z)-3-hexenyl acetate, decanal, 3-hexenyl isovalerate, nonanal, ocimene, and 2-cyanobutane can be induced by both insects attack-ing and mechanical damage, while 2,6-dimethyl-1,3,5,7-octatetraene, 2-methyl-6-methylene-1,7-octadien-3-one, caryophyllene, Isovaleronitrile, diethyl-methyl-benzamide, and dicapryl phthalate were only induced by insects attacking. Such difference in volatiles was attributed to that there existed active components in oral sections of the larvae of Lymantria dispar 展开更多
关键词 Induced volatiles Oral secretions of insects Mechanical damage the larvae Lymantria dispar attacking
下载PDF
Effect of Lonicerae Flos extracts on reflux esophagitis with antioxidant activity 被引量:20
6
作者 Sae-Kwang Ku Bu-Il Seo +5 位作者 Ji-Ha Park Gyu-Yeol Park Young-Bae Seo Jae-Soo Kim Hyeung-Sik Lee Seong-Soo Roh 《World Journal of Gastroenterology》 SCIE CAS CSCD 2009年第38期4799-4805,共7页
AIM: To observe the effects of traditional antiinflammatory medicine Lonicerae FIos (LF) on rat reflux esophagitis (RE) induced by pylorus and forestomach ligation compared with the well-known proton antioxidant,... AIM: To observe the effects of traditional antiinflammatory medicine Lonicerae FIos (LF) on rat reflux esophagitis (RE) induced by pylorus and forestomach ligation compared with the well-known proton antioxidant, α-tocopherol. METHODS: Rats were pretreated with three different dosages of LF (500, 250 and 125 mg/kg) orally, once a day for 14 d before pylorus and forestomach ligation. Nine hours after pylorus and forestomach ligation, changes to the stomach and esophagus lesion areas, gastric volumes, acid and pepsin outputs, antioxidant effects, esophageal lipid peroxidation, superoxide dismutase (SOD), catalase (CAT), malondialdehyde (MDA), myeloperoxidase and glutathione (GSH) levels, and collagen contents (marker of flexibility) were observed on the esophageal and fundic histopathology. The results were compared with an α-tocopherol (once orally, 1 h before operation, 30 mg/kg) treated group in which the effects on RE were already confirmed.RESULTS: Pylorus and forestomach ligations caused marked increases of gross esophageal and gastric mucosa lesion areas, which corresponded with histopathological changes. In addition, increases of esophageal lipid peroxidation, decreases of SOD, CAT, and GSH-free radical scavengers, increases of collagen were observed. However, these pylorus and forestomach ligation induced RE were dose-dependently inhibited by treatment of 500, 250 and 125 mg/kg of LF extract, mediated by antioxidant effects. RE at 250 mg/kg showed similar effects α-tocopherol. CONCLUSION: The results suggest that antioxidant effects of LF could attenuate the severity of RE and prevent the esophageal mucosal damage, and validate its therapeutic use in esophageal reflux disease. 展开更多
关键词 Reflux esophagitis TOCOPHEROL LoniceraeFlos Antioxidant MYELOPEROXIDASE Pylorus and forestomach ligations
下载PDF
台湾乳白蚁对马尾松提取液取食偏好性研究 被引量:4
7
作者 刘炳荣 钟俊鸿 +1 位作者 冯世秀 李志强 《林业实用技术》 北大核心 2010年第6期37-38,共2页
以马尾松木材为研究材料,以乙醇提取其主要的活性物质,再依次用石油醚、乙酸乙酯、正丁醇萃取分部,研究了台湾乳白蚁对各部分萃取液的取食偏好性。结果表明,台湾乳白蚁最喜食马尾松正丁醇部和水部提取的活性物质。
关键词 台湾乳白蚁 马尾松 取食性
原文传递
Study on Extraction and Conversion Annatto (Bixa orellana L.) Color into Norbixin to Prepare Food Grade Water-Soluble Norbixin Powder
8
作者 Tran Thi Ha Dao Phan Thoai +1 位作者 Le Thi Thu Thuy Phan The Dong 《Journal of Life Sciences》 2017年第2期97-104,共8页
Response surface methodology was used in this research to optimize the technical parameters of the extraction and conversion color compound in armatto seeds into norbixin. Parameters affected the extraction efficiency... Response surface methodology was used in this research to optimize the technical parameters of the extraction and conversion color compound in armatto seeds into norbixin. Parameters affected the extraction efficiency and norbixin recovery yield were solvent concentration, rate of solvent/seed, incubation time, and incubation temperature. The optimization results including: concentration of ethanol is 51.82°; concentration of NaOH is 0.52 M; ratio of solvent/seed is 7.1/1; incubation time is 33.12 minutes, incubation temperature is 58.6℃, and the rate of 36% HCl/color solution is 0.5/5 (v/v). 展开更多
关键词 Achiote Bixa orellana L. BIXIN norbixin EXTRACTION CONVERSION food color.
下载PDF
Extraction of Dietary Fiber from Wheat Bran and Effects of Its Additives on Viscosity-elasticity of Noodle Dough 被引量:1
9
作者 CAI Wei-rong CHEN Yong +1 位作者 LI Qing-hua TAO Peng-fei 《Chinese Food Science》 2012年第2期32-36,共5页
[ Objective] The aim was to study the optimum extraction condition of dietary fiber of wheat bran and to discuss its influence on viscosity-elasticity of noodle dough with added extracts. [ Methed] Influences of a-amy... [ Objective] The aim was to study the optimum extraction condition of dietary fiber of wheat bran and to discuss its influence on viscosity-elasticity of noodle dough with added extracts. [ Methed] Influences of a-amylase, alkaline concentration, alkaline hydrolysis time and temperature on water holding capability and swelling capacity of dietary fiber were evaluated using single-factor test and orthogonal test. Effects of added dietary fiber from wheat bran on dough absorption ratio, rupture stress of dough and creep resistance were studied. [ Result] When the hydrolysis condi-tions of wheat bran were 0.4% a-amylase at 75 ℃ for 60 rain, further alkaline conditions were 5% sodium hydroxide for 60 min at 65 ℃, dietary fi-ber exhibited fine water holding capability and swelling capacity. The addition of 3%-5% dietary fiber from wheat bran into dough had little influence on the water absorption ratio of noodle, rupture stress of dough, creep resistance and can make functional noodle with rich dietary fiber from wheat bran. [Coonclusion] The study provided reference for the comprehensive utilization of wheat bran and development of functional product. 展开更多
关键词 Wheat bran Dietary fiber EXTRACTION NOODLE Dough property China
下载PDF
Recent Advances in Separation of Bioactive Natural Products 被引量:7
10
作者 任其龙 邢华斌 +4 位作者 鲍宗必 苏宝根 杨启炜 杨亦文 张治国 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2013年第9期937-952,共16页
Bioactive natural products are a main source of new drugs,functional foods and food additives.The separation of bioactive natural products plays an important role in transformation and use of biomass.The isolation and... Bioactive natural products are a main source of new drugs,functional foods and food additives.The separation of bioactive natural products plays an important role in transformation and use of biomass.The isolation and purification of bioactive principle from a complex matrix is often inherent bottleneck for the utilization of natural products,so a series of extraction and separation techniques have been developed.This review covers recent advances in the separation of bioactive natural products with an emphasis on their solubility and diffusion coefficients,recent extraction techniques and isolation techniques.This overview of recent technological advances,discussion of pertinent problems and prospect of current methodologies in the separation of bioactive natural products may provide a driving force for development of novel separation techniques. 展开更多
关键词 BIOMASS chromatography. extraction ISOLATION natural products
下载PDF
Study on Extraction of Insoluble Dietary Fiber from Apple pulp
11
作者 ANG Lei LI Chao +2 位作者 ZHU Dong CHEN Wei TANG Zhi-hua 《Chinese Food Science》 2012年第2期11-13,共3页
[ Objective] To optimize the extraction conditions of insoluble dietary fiber from apple pulp. [ Method] The insoluble dietary fiber was ex-tracted from the apple pulp by alkaline, and the optimal extraction condition... [ Objective] To optimize the extraction conditions of insoluble dietary fiber from apple pulp. [ Method] The insoluble dietary fiber was ex-tracted from the apple pulp by alkaline, and the optimal extraction conditions were determined by orthogonal experiment. [ Result] The influential or-der of each factor on the extraction of insoluble fiber decreased in the order of solid-liquid ratio 〉 alkali concentration 〉 temperature 〉 extraction time, and the optimal extraction technology was A3 B1 C2 D2, that is, 1:11 (g/ml) of solid-liquid ratio, 0.25 mol/L alkaline concentration, 50 ℃ of extraction temperature and 2.0 h extraction time, under these conditions, the yield of insoluble dietary fiber was 35.46%. [ Conchsion] The apple pulp contains rich dietary fiber, and the insoluble dietary fiber extracted from the apple pulp has great development value. Key words Apple; Insoluble dietary fiber; Extraction technology; China 展开更多
关键词 APPLE Insoluble dietary fiber Extraction technology China
下载PDF
Are extrafloral nectaries efficient against herbivores? Herbivory and plant defenses in contrasting tropical species
12
作者 Cássio Cardoso Pereira Maria Gabriela Boaventura +1 位作者 Gislene Carvalho de Castro Tatiana Cornelissen 《Journal of Plant Ecology》 SCIE CSCD 2020年第4期423-430,共8页
Aims Plants have limited resources for defenses and species that invest in biotic defenses might exhibit leaves that invest less in other types of defenses.We have investigated whether plants that have few mechanical ... Aims Plants have limited resources for defenses and species that invest in biotic defenses might exhibit leaves that invest less in other types of defenses.We have investigated whether plants that have few mechanical defenses,but have extrafloral nectaries(EFNs)patrolled by ants,are less prone to herbivory,compared with plants without EFNs that have tougher leaves.Methods Data from the literature were extracted to examine the reported levels of herbivory in plants with or without EFNs.In a savanna vegetation in southern Brazil,field data were collected in leaves from six tropical species and herbivory and specific leaf area(SLA)levels were measured.We further evaluated differences in herbivory and SLA among species and between plants with or without EFNs.In order to test the relationship between herbivory and leaf toughness we regressed average herbivory and average SLA per plant.Important Findings Plants exhibited variable levels of leaf damage,but plants without ant defenses experienced the highest levels of leaf area loss to herbivory.Levels of mechanical defenses were also variable among the plant species.Plants without EFNs were tougher,exhibiting lower values of SLA.Although plants without EFNs had more sclerophyllous leaves,this mechanical defense was not sufficient to impair and/or reduce herbivore feeding,suggesting that the biotic defenses performed by patrolling ants might be more effective than investment in mechanical defenses associated with leaf palatability. 展开更多
关键词 ants biotic defenses HERBIVORY leaf palatability specific leaf area
原文传递
Extraction of soluble collagen and its feasibility in the palaeodietary research
13
作者 WANG Ning HU YaoWu +3 位作者 HOU LiangLiang YANG RuiPing SONG GuoDing WANG ChangSui 《Science China Earth Sciences》 SCIE EI CAS 2014年第5期1039-1047,共9页
In current palaeodietary research, gelatinization is the main method to extract insoluble collagen (ISC) from ancient bones. However, the degradation products of ISC, i.e., soluble collagen (SC), is often neglecte... In current palaeodietary research, gelatinization is the main method to extract insoluble collagen (ISC) from ancient bones. However, the degradation products of ISC, i.e., soluble collagen (SC), is often neglected and abandoned. In this work, we try to separate the extracts of ancient bones using gel chromatography and compare the contents of carbon and nitrogen, atomic C/N ratio, and stable carbon and nitrogen isotopic values of the extracts from three peaks to determine which peak can be at- tributed to SC. At last, the potential application of SC in palaeodietary research is discussed based on the comparison of stable isotopic values between ISC and SC. Among the three peaks, the second with the retention time between 17.5 min and 27.5 min had the most broad peak shape, indicating that the molecular weights of proteins collected were most variable. Besides, the contents of carbon and nitrogen and atomic C/N ratio of extracts in this peak were closest to the corresponding ISC. Based on the above, we conclude that the extract in second peak is SC. More important, the δ13c and δ15N values of ISC and SC are very similar. For ISC and SC with atomic C/N ratios within the normal range (2.9-3.6), the mean difference of δ13C value was only (0.3±0.2)%o (n=2) while δ15N value was (0.6±0.1)‰ (n=2). Although the atomic C/N ratios of some SC are slightly be- yond the normal range, the mean differences of δ13C and δ15N values were still only (0.4±0.1)‰and (0.3±0)‰ (n=2) respec- tively. These isotopic differences are quite below the isotope fractionation in one trophic level δ13C values of 1‰-1.5‰ and 615N values of 3‰-5‰), suggesting that SC had great application potentials in palaeodietary research. 展开更多
关键词 soluble collagen insoluble collagen gel chromatography stable isotopic analysis
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部