共查询到19条相似文献,搜索用时 211 毫秒
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黑木耳Auricularia heimuer凭借较高的营养价值,作为特色农产品在我国广泛种植。采用不同基质(杂木屑、甘蔗渣和棉籽壳)栽培黑木耳,研究黑木耳产品营养成分、质构特性以及稳定同位素之间的特征差异。利用国家标准、质地多面分析技术、稳定同位素技术对其营养成分、质构特性和稳定同位素进行特征差异分析和比较。结果表明,以棉籽壳为主要栽培基质的黑木耳的氨基酸、灰分含量最高,以甘蔗渣为主要栽培基质的黑木耳蛋白质、粗多糖、总糖含量最高,以杂木屑为主要栽培基质的黑木耳粗纤维含量最高,差异显著(P<0.05)。黑木耳的硬度、胶着性、咀嚼性以甘蔗渣为主要栽培基质的黑木耳最优。不同培养基质黑木耳样品的稳定同位素比率差异显著,其中甘蔗渣基质栽培黑木耳中δ13C、δ15N、δ2H和δ18O最高,棉籽壳基质栽培黑木耳中δ34S最高。不同培养基质栽培的黑木耳营养及质构特性具有一定相关性。本研究试图阐明不同栽培基质的黑木耳子实体的稳定同位素、营养及品质的差异,可为黑木耳地域和品质鉴别提供有利的数... 相似文献
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黑木耳栽培通常采用的是利用锯木屑为栽培种,在段木上进行生产栽培。这种接种方法生产工艺繁琐,工效较低,还易引起杂菌污染。下面介绍一种取材方便,操作简便,效果较好的黑木耳栽培种的制作技术。1母种培养仍采用PDA培养基,按常规法配制,接种培养即可。2原种培... 相似文献
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目的:使用简捷快速的方法鉴选出适于玉米芯栽培的黑木耳菌株。方法:试验以纯玉米芯为营养源,以琼脂为凝固载体,使用平板培养基快速筛选出适于玉米芯栽培的黑木耳菌株。结果:使用20个供试菌株,只需20d初步筛选出"HW10号"、"黑29"两株适于玉米芯培养料栽培的黑木耳菌株。栽培试验结果为,添加玉米芯栽培出菇,黑木耳子实体经济性状与纯木屑栽培组无差别,"HW10号"玉米新添加量为40%时产量最高,比对照木屑组产量提高7.25%;"黑29"玉米新添加量为30%时产量最高,比对照木屑组产量提高8.82%。结论:使用平板培养基快速筛选适于玉米芯栽培的黑木耳菌株方法可行,该筛选方法操作简单、缩短筛选时间、筛选成本低。 相似文献
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目的研究单糖、pH、温度及时间对青春双歧杆菌、长双歧杆菌和类干酪乳杆菌体外增殖的影响。方法用甘露糖、半乳糖、山梨醇及果糖代替MRS中的葡萄糖,筛选出每种细菌的最适碳源。以此为基础,选择其最佳初始pH、培养温度、碳源添加量及培养时间。结果青春双歧杆菌、长双歧杆菌和类干酪乳杆菌的最适碳源分别为葡萄糖、甘露糖和半乳糖;最佳初始pH为6.0、7.0和6.0;培养温度为42、30和30℃;碳源添加量为20、15和25 g/L;培养时间都为28-48 h。结论益生菌具有不同的最适增殖条件,本文研究结果为优化益生菌的生长条件提供了基础数据。 相似文献
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肠道微生物分泌的蛋白酶可促进家蚕对桑叶养分的消化吸收,枯草芽孢杆菌是家蚕肠道内一种重要的产蛋白酶菌株。为提高枯草芽孢杆菌蛋白酶的高效利用,对该菌株适宜发酵条件及酶学性质进行了研究。结果表明:各因素对枯草芽孢杆菌产酶活性影响的大小顺序依次为:pH值〉培养温度〉培养时间〉装液量;最适的产酶条件为:pH=7,培养温度:30 ℃,培养时间:36 h;对枯草芽孢杆菌产蛋白酶进行初步提纯后并研究得出该酶反应的最适pH 10.0,最适反应温度为:60 ℃;该酶为碱性蛋白酶、不耐高温、不耐酸,但在35 ℃条件下热稳定性较好。 相似文献
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在ipt-GUS转基因拟南芥中双组分信号传导基因应答体内细胞分裂素的增加 总被引:1,自引:0,他引:1
ipt—GUS转录融合基因在拟南芥植物中表达,其体内细胞分裂素的含量可达到野生型的20-30倍。从拟南芥种子萌发后的6、12、20和30d四个时间分析了植物体内细胞分裂素含量的提高对其双组分信号传导系统中基因的影响。研究发现:细胞分裂素受体基因CRE1比CKI1基因更容易被增加的植物细胞分裂素诱导表达。拟南芥植物细胞分裂素反应调节基因ARR4和ARR5在植物发育的不同时期应答植物体内增加的植物细胞分裂素,ARR4的应答反应比ARR5早,种子萌发后的第6天幼苗真叶形成初期,ARR4基因被明显涛导;而ARR5的应答反应在幼苗真叶形成后的几个时间段均能检测到,并且在种子萌发后的第20天,花枝形成开始时特别明显。在双组分信号传导途径中,从受体到反应调节基因传导磷酸基团的传导基因AHP4在幼苗发育的后期种子萌发后的第20和30天,应答植物体内增加的植物细胞分裂素,并且在花枝形成初期比较明显。 相似文献
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Physiological basis for the cultivation of the Gelidiaceae 总被引:2,自引:2,他引:0
An understanding of the physiological factors important to growth and agar production of the Gelidiales would be useful for successful mariculture of these commercially valuable plants. Several environmental factors, including light, nitrogen, carbon, temperature and water motion, have been shown to have potential significance for growth rates, reproduction and carbon partitioning in defining optimal conditions for cultivation. Limiting and optimal growth conditions, where known, are presented, and evaluation of data reported in the literature is addressed. 相似文献
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An isolate of Nia vibrissa was fermented in liquid shake cultures and on agar. Suitable cultivation conditions are a prerequisite for the continuous synthesis of biological active metabolites. The growth response of N. vibrissa to four selected media and several environmental factors, such as salinity, pH and light, was studied. The amount of produced mycelia and the quantity and activity of the organic extracts were parameters for the optimal cultivation method. The ethanolic extracts of the mycelia of N. vibrissa grown in all the investigated nutrient media, showed an influence of the duration of cultivation on the biological activity. A synthetic medium with a pH of 7.5 was the preferred nutrient medium. The addition of wood and incubation under continuous light had no effect on growth but increased the activity of the ethanolic extract. The optimal agar medium salinity for colony growth was in the range between 5 and 25‰. At a salinity of 150‰ growth was not observed. 相似文献
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The optimal temperature and illumination photoperiod requirements for the phototrophic growth of a novel microplantlet suspension culture derived from the macrophytic marine red alga Agardhiella subulata were determined. The optimal growth temperature was 24 degrees C. The effects of illumination light-dark (LD) photoperiod (hour of light:hours of darkness within a 24 h cycle) on biomass production was studied within a bubble-column photobioreactor. The 4.5 cm diameter photobioreactor was maintained at near-saturation conditions with respect to light flux (38 mciromol photons m(-2) s(-1)), nutrient medium delivery (20% nutrient replacement per day), and CO(2) delivery (0.35 mmol CO(2) L(-1) h(-1)) so that the cumulative effects of photodamage on the cell density versus time curve at photoperiods approaching continuous light could be observed. Biomass production was maximized at 16:8 LD, where biomass densities exceeding 3.6 g dry cell mass L(-1) were achieved after 60 days in culture. Biomass production was proportional to photoperiod at low fractional photoperiods (< or =10:14 LD), but high fractional photoperiods approaching continuous light (> or = 20:4 LD) shut down biomass production. Biomass production versus time profiles under resource-saturated cultivation conditions were adequately described by a cumulative photodamage growth model, which coupled reversible photodamage processes to the specific growth rate. Under light-saturated growth conditions, the rate constant for photodamage was kd = 1.17 +/- 0.28 day(-1) (+/-1.0 SE), and the rate constant for photodamage repair was kr = 5.12 +/- 0.95 day(-1) (+/-1.0 SE) at 24 degrees C. 相似文献
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To resolve “the supply problem” in sponge-derived drug development and other biotechnological applications, current research
is exploring the possibility of obtaining an alternative sustainable supply of sponge biomass through intensive aquaculture
of sponges utilizing artificial seed rearing. This study aimed to investigate the technology of early juvenile sponge cultivation
under controlled conditions. The effects of food, temperature, water flow, and light on the growth and survival of early juveniles
of the marine sponge Hymeniacidon perlevis were examined. The concentrations of four types of food elements [microalgae (Isochrysis galbana), photosynthetic bacteria (Rhodopseudomonas), Fe3+ (FeCl3), and Si (Na2SiO3)] were investigated for early H. perlevis juvenile growth. Interestingly, temperature changes have striking effects on juvenile growth. Juvenile sponges grow faster
when they are shifted to higher temperatures (18°C to 23°C) than when they are shifted to lower temperatures (18°C to 4°C
to 23°C) or kept at a constant temperature (18°C). Periodic water flow and light cycles favor early juvenile sponge growth.
Light was found to be a key factor in the color loss of early H. perlevis juveniles. Overall, size (area) increased as much as 29 times for H. perlevis juveniles under the tested controlled conditions. 相似文献
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Synopsis The influence of light and prey abundance on the vertical distribution of herring larvae was evaluated by three investigations made under calm weather conditions in the North Sea off the Scottish coast. The investigations took place at different time after hatching and the vertical distributions of three size groups of larvae (mean sizes 8,15 and 19 mm) were related to time of day and the vertical distribution of copepods. No migratory behaviour of copepods was observed but their vertical distribution differed between investigations. In the investigation on intermediate sized larvae, copepod density peaked at the pycnocline (40 m). Larvae concentrated at this depth at noon. At dawn and dusk larvae migrated towards the surface and the vertical distributions fluctuated semidielly. In the two other investigations, copepods were homogeneously distributed in the water column and after migration towards the surface at dawn larvae stayed in the upper water column during the day. The observations suggest that the daytime vertical distribution of larvae in calm weather is mainly determined by feeding conditions: the larvae move to depths were light is sufficient for feeding, and refinement within that zone is made according to a compromise between optimal light conditions for feeding and optimal prey densities. 相似文献