共查询到20条相似文献,搜索用时 78 毫秒
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LIU Kai-qi XIANG Mei-mei LIU Ren ZENG Yong-san YANG Yong YU Jin-feng JIANG Xin-yin ZHANG Yue-li 《浙江大学学报(农业与生命科学版)》2004,30(4):429-429
The pectin is a backbone of the plant cell wall, its network structure will systemicly resolve when the plant cell splits up and forms. The pectinase produced by Rhizoctonia mainly acts on the pectin of cell wall, and causes the maceration of tissue and the death of protoplast. Polygalacturonase (PG) can decompose the galacturonic acid of disease tissue. The research defined the PG activities of extracellular metabolite of the different virulence Rhizoctonia isolates, and testifid the e… 相似文献
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苹果(品种“Quettaamri,“Kulu”,“Kashmiriamri”)幼芽(茎)培养在含不同水平(0~2.0mg/L)IBA,NAA或IAA的1/2MS培养基上时,可以分化出根.与其它品种相比,“Kashmiriamri”最易生根.各品种在低浓度生长素水平下的生根效果较好.IBA比NAA和IAA对生根的促进作用大,在不含生长素的培养基上幼芽(茎)不能生根 相似文献
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Culture condition of every phase for fermentation of yeast culture was studied, and its solid and liquid conditions of elaboration were optimized to improve the total counts of living cells. Results showed that microzyme grew best at 30℃ when solid fermented, and the count of the living cells reached the tiptop with pH 5.5. The count of Candida tropicalis could reach 137.96× 10^9 cfu·g^-1, the count of Saccharomyces cerevisia could reach 134.62× 10^9 cfu·g^-1 the best liquid fermentation condition for cell-wall broken was 50℃ for 28 h, the rate of cell-wall broken could reach 80% at least; the rate of vitamin loss in yeast could be the minimun, the loss rate of vitamin B6 in Candida tropicalis and Saccharomyces cerevisiae was 8.71% and 19.54% respectively, the loss rate of vitamin B2 was 19.39% and 13.18%, respectively, and the loss rate of vitamin B6 was 6.3% and 3.04%, respectively. 相似文献
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分析了7种鞘翅目昆虫幼虫的蛋白质、脂肪、部分矿物质和微量元素含量以及蛋白氨基酸的组成,被分析的昆虫种类包括黄粉虫、华北大黑腮金龟、铜绿丽金龟、凸星花金龟、桃红颈天牛、黄星天牛和桑天牛.分析结果表明:7种幼虫均含有较丰富的蛋白质,含量均在41.8%以上,最高的达51.6%.脂肪的含量变化较大,从铜绿丽金龟的14.05%到桃红颈天牛的35.89%.氨基酸含量为24.97%~57.66%;必需氨基酸占总氨基酸含量的42.21%(桃红颈天牛)~48.94%(黄星天牛),全部高于FAO/WHO推荐的模式标准.7种幼虫的第一限制性氨基酸为含硫氨基酸,即蛋氨酸和胱氨酸,其氨基酸分(AAS)在8~60之间.黄粉虫、华北大黑鳃金龟、凸星花金龟的第二限制性氨基酸为赖氨酸;桑天牛、华北大黑鳃金龟、黄星天牛、铜绿丽金龟的第二限制性氨基酸为亮氨酸;桃红颈天牛的第二限制性氨基酸为苯丙氨酸.6种矿物质和微量元素的分析表明,黄粉虫、华北大黑鳃金龟、桑天牛幼虫含有较高的锌,铜绿丽金龟、华北大黑腮金龟含有较丰富的钙和铁.结果说明这些昆虫幼虫有可能作为良好的食用昆虫或饲用昆虫. 相似文献
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Antioxidant Activity of Ethanol Extract of Pomegranate Seed 总被引:1,自引:0,他引:1
In this study, the ethanol extract of pomegranate seed was prepared and its antioxidant activities were investigated. It was found the total phenolic content in the extract was as high as 41.791 mg GAE/g. And the extract showed high antioxi- dant activity measured as scavenging of DPPH radicals, hydroxyl radicals. It also exhibited strong antioxidant activity in reducing power and Rancimat test. These re- sults demonstrated Pomegranate seeds could serve as a new source of natural an- tioxidant. 相似文献
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Antagnism of three strains of Trichoderma spp. against mycelial growth of Rhizoctonia salani 下载免费PDF全文
ZHANG Jing-ze TU Yan-la 《浙江大学学报(农业与生命科学版)》2004,30(4):411-411
Three strains of Trichoderma spp. TV112, TX003, TY009 obtained from previous experiments could inhibit the sclerotial formation of two strains of Rhizoctonia salani AG1 (-1A) isolated from the rice paddies in Hanzhou of China. However, it is unclear if there are the antagonism and mycoparasitism of the Trichoderma strains tested against the mycelial growth of R. solani . The objective of this research was to evaluate the ability of the Trichoderma strains to inhibit the mycelial… 相似文献
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SHEN Ping GAO Guisheng SHI Qiumei LI Min 《东北农业大学学报(英文版)》2009,16(1):56-58
To investigate the mechanism of action of Chinese herbal medicine, the immunocells of Harder's glands were observed. The healthy Hy-Line Brown chickens of 12-day-old were divided into three groups randomly. The chickens in group 1 and 2 drank the water with 0.5% and 1% Chinese herbal medicine immunopromoter every day. The chickens in group 3 as control drank pure water. The Harder's glands of the chickens from 0.5% group, 1% group and control group at 24, 36 and 48 d after drinking medicine respectively were made into histological section. And then the histological sections were observed histologically. The results showed that Chinese herbal medicine could increase the quantity of the immunocells in glandular organs conspicuously. Immunopotentiator of Chinese herbal medicine could promote the amount and growth of secreted immunoglobuline and elevate the immune level of the orgamsm, and the effect of 1% group was higher than that of 0.5% group. 相似文献
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Abdullah F Ilias G N M 《浙江大学学报(农业与生命科学版)》2004,30(4):391-391
The palm, Elaeis guineensis, has its origins in Africa but is planted on a commercial basis in several countries Statistics for 2002 showed that in the lead for land mass under oil palm cultivation is Indonesia, at 3,769,000 ha, followed by Malaysia at 3,376,000 ha; however, the world‘s leading 相似文献
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F.S. Hamid Tahira Ahmad 《农业科学与技术》2006,7(1):14-22
Field experiment was conducted on mature tea bushes of Qi-Men variety at two different altitudes from sea level i.e. at National Tea Research Institute Shinkiari (1000 m) and on farmer's field in Konsh valley at village Battal (1500 m). Different levels of nitrogen with constant dose of phosphorus and potassium were applied to observe the optimal dose of nutrients for highest yield under local edaphic conditions. The experiment was repeated for three consecutive years. The highest yield of fresh tea leaves were obtained by the application of 420 kg ha^-1 N followed by the application of 360 kg ha^-1 N at 1000 masl. The highest dose of nitrogen also reduced significantly the soil pH in the upper (0-15cm) layer depth during 1998 and 1999. During the year 2000, the reduction in soil pH was observed by the application of highest dose of nitrogen but was non-significant at 5% level. The lower soil depth (15-30 cm) showed the reduction in pH with the highest dose of nitrogen during the experimental year but was statistically non significant.
At the higher altitude of 1500 masl the highest yield of fresh tea leaves was obtained by the application of 420 kg ha^-1 during the experimental years but the increase was significant during the year 1999 and 2000. The yield of the fresh tea leaves was positively correlated with the amount of nitrogen application at both the altitudes. The increasing amount of nitrogen decreased the soil pH at both the depths of 0-15cm and 15-30cm. Unlike the lower altitude (1000 m) there was no any significant reduction in the soil pH during 1998 and 1999. A significant reduction in soil pH was found in the year 2000. 相似文献
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FENGKai-lin YANGWei-min CHENkang-ning 《东北农业大学学报(英文版)》2003,10(2):156-160
The working principle of radio remote controlling of construction machinery should be that signals of the radio wave from the transmitter obtained in the receiver were controlled and then changed into electronic analog or digital signals which can be used to drive different actuators and mechanisms of the vehicle. The vehicle could be acted by following the controlling instructions sent by the operator. The best operation mode of construction machinery is suitable not only to manual operating but also to remote controlling in the same vehicle. The design methods of the hydraulic system used for the radio remote controlling of construction machinery are discussed. The design methods of hydraulic circuits for the actuators controlled by solenoid on-off type valves ,hydro-electronic multi-way proportional valves,closed loop proportional servo driver or threeway proportional reducing valves are discussed in detail (with real example). The design methods of the power shift transmission of electro-hydraulic controlling,the devices of braking and the directional streering are discussed in this paper. 相似文献
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采用L(934)正交设计试验,对山茱萸浸提液中山茱萸多糖的酶水解法提取工艺进行了优化研究,并对浸提液的中有效成分马钱苷含量进行了HPLC法分析。结果表明,山茱萸多糖浸提的最佳工艺为:液料比1∶5,浸提时间4 h,浸提温度80℃,果胶酶添加量0.55 g/L。用HPLC法测定出的山茱萸浸提液中马钱苷平均含量为0.512 ... 相似文献
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生态旅游潜在客源市场特征的调查研究--以湖南永州金洞森林旅游开发为例 总被引:5,自引:2,他引:3
李慧云 《湖南农业大学学报(自然科学版)》2004,30(2):165-168
为探明客源市场生态旅游消费的潜在特征,采用问卷调查的形式,就长沙市居民对湖南金洞生态旅游开发的意向等问题进行抽样调查.结果显示,生态旅游符合人们“回归自然”的旅游新时尚,有着极大的开发空间,指出生态旅游的开发要注重环境保护和可持续发展.开发的产品要以休闲度假类的大众产品为主,开发生态旅游都市客源市场还要多种渠道并用,尤其是要注重媒体的宣传. 相似文献
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姬松茸碳源利用规律的研究 总被引:1,自引:0,他引:1
试验采用麦秸培养基,系统研究了姬松茸在生长期间对碳源的利用规律。结果表明,姬松茸降解的有机物质绝大部分被菌体的呼吸过程消耗掉,绝对生物学效率较低;在菌丝生长阶段,木质素的降解速率大于纤维素和半纤维素,这对纤维素和半纤维素的降解十分有利;非木质纤维素组分在菌丝生长阶段被主要利用,而木质纤维素则是子实体生长阶段的主要碳源。且就整个栽培过程而言,姬松茸生长发育所需要的79.86%的碳源来自木质纤维素。 相似文献
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《河北农业大学学报》创刊年代考 总被引:3,自引:0,他引:3
清光绪二十八年(1902)河北农业大学前身—直隶农务学堂诞生,经几易其名,于1958年更名为河北农业大学至今。清光绪三十一年(1905)直隶高等农业学堂时期创办了《北直农话报》,清光绪三十四年(1908)更名为《直隶农务官报》,中华民国七年(1918)改出《农学月刊》,中华民国十七年(1928)易名为《河大农刊》,中华民国二十三年(1934)更名为《河北通俗农刊》,中华民国二十四年(1935)易名为《河北农林学刊》,1948年更名为《河北农学院研究专刊》,1959年更名为《河北农业大学学报》至今。《河北农业大学学报》前身诸刊都与现时的《河北农业大学学报》有着一脉相承的历史渊源,各刊之间联系紧密,连续性、继承性强。因此,《河北农业大学学报》的创刊时间应追溯至1905年创办的《北直农话报》。 相似文献
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切花菊耐热性鉴定方法研究 总被引:2,自引:0,他引:2
以8个切花菊品种为材料,通过对离体叶片进行50℃高温胁迫后,采用电导法、电阻抗图谱法测定电导率、电阻,并对大田栽培植株进行田间高温胁迫试验,比较品种间的耐热性。结果表明:电导法测得的50℃直接相对电导率、修正相对电导率和电阻抗图谱法测得的胞外电阻在品种间有明显差异,但与田间高温胁迫法测定的热害指数不完全一致。电导法和电阻抗图谱法都可以作为测定切花菊耐热性的方法,但需要结合田间耐热性观察。 相似文献
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应用萄聚糖凝胶柱层析对水牛梭形住肉孢子虫包囊包溶性抗原进行了纯化。结果表明:纯化水牛梭形住肉孢子虫包囊抗原的最适条件为:选用萄聚糖凝胶G—100柱层析系统;洗脱液为03MPBS(pH72),床体积为10cm×165cm,上样体积为500HL;流速为12mL/h。纯化抗原可使琼脂凝胶双扩散试验的阳性检出率提高30%。 相似文献
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