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111.
黑莓汁的理化特性及贮藏期营养成分的变化 总被引:10,自引:1,他引:10
对黑莓浓缩汁的理化特性及其营养成分变化进行研究,结果表明:pH3~4,波长511~514nm时,果汁色泽最佳;果汁抗氧化还原能力很弱,但具有很强的光和热的稳定性。0~4℃低温贮藏1年后,6种维生素的损失率都超过50%;含糖量损失407%;SOD活性和氨基酸含量分别损失10%和124%;含酸量略有增加 相似文献
112.
研究小花杜鹃(Rhododendron minutiflorum)的化学成分及其α-葡萄糖苷酶抑制活性。采用正相硅胶、ODS、Sephadex LH-20和HPLC等多种色谱技术,从小花杜鹃的95%乙醇提取物中分离得到9个化合物,通过波谱分析和文献数据对比,鉴定其结构分别为rhodominutinan A(1)、rhodominutinan B(2)、3,4-di(4-hydroxy-3-methoxybenzyl)tetrahydrofuran(3)、venkatasin(4)、苔色酸甲酯(5)、苔黑酚羧酸乙酯(6)、2,4-二羟基-3,6-二甲基苯甲酸甲酯(7)、芹菜素(8)、山奈酚(9)。其中化合物1和2为新的木脂素,化合物3~9为首次从小花杜鹃中分离得到。通过α-葡萄糖苷酶抑制剂体外筛选模型评价化合物的潜在降血糖活性,结果表明化合物8和9具有较好的α-葡萄糖苷酶抑制活性,IC50值分别为57.51±6.35、54.70±3.67μM。 相似文献
113.
N,N′-Dicyclohexylcarbodiimide (DCCD) inhibits the activity of ubiquinol-cytochrome c reductase in the isolated and reconstitued mitochondrial cytochrome b-c1 complex. DCCD inhibits equally electron flow and proton translocation (i.e., the ratio is not affected) catalysed by the enzyme reconstituted into phospholipid vesicles. The inhibitory effects are accompanied by structural alterations in the polypeptide pattern of both isolated and reconstituted enzyme. Cross-linking was observed between subunits V (iron-sulfur protein) and VII, indicating that these polypeptides are in close proximity. A clear correlation was found between the kinetics of inhibition of enzymic activity and the cross-linking, suggesting that the two phenomena may be coupled. Binding of [14C]DCCD was also observed, to all subunits with the isolated enzyme and preferentially to cytochrome b with the reconstituted vesicles; in both cases, however, it was not correlated kinetically with the inhibition of the enzymic activity. 相似文献
114.
Gerhard Zotz 《Botanical journal of the Linnean Society. Linnean Society of London》2013,171(3):453-481
Vascular epiphyte species exclusively, or at least primarily, germinate and grow on other plants without contact with the soil and, in contrast to mistletoes, without parasitizing their hosts. The last review of the systematic distribution of this diverse group of plants dates back more than two decades. The present study pursues three major goals: (1) it critically discusses conceptual problems arising from the distinction of epiphytes from non‐epiphytes; (2) it presents a compilation of epiphytic diversity derived from a vast number of sources; and (3) it arranges epiphyte diversity in an up‐to‐date taxonomic framework. The resulting compilation, which identifies 27 614 species of vascular epiphytes (including primary hemiepiphytes) representing 913 genera in 73 families, or approximately 9% of extant vascular plant diversity, is meant to be an important tool for studies on the ecology and evolution of epiphytes, but also for comparative studies with a focus on other life forms. © 2013 The Linnean Society of London 相似文献
115.
Water quality and phytoplankton community structure in mangrove streams under different logging regimes in Cameroon 下载免费PDF全文
Ambo Beatrice Fonge Pascal Tabi Tabot Coleen Mumbang Chop Adeline Mange 《African Journal of Ecology》2016,54(1):39-48
Mangrove logging is rampant, and its effects on phytoplankton dynamics have not been investigated. Phytoplankton are valuable in biomonitoring pollution in mangrove ecosystems. This study assessed the relationship between physico‐chemical characteristics of the water and observed phytoplankton community structure, in relation to anthropogenic activities. Water samples were collected from seven sites within the mangrove ecosystem that differed in wood harvesting age and proximity to human settlements. Characterization of samples followed standard methods. pH of all water samples indicated acidity. Phytoplankton species richness and soluble P were positively correlated (r = 0.822, P ≤ 0.023), but no correlations existed with logging age (r = ?0.273, P = 0553). The site with highest soluble phosphorus concentration (Site 4) had highest phytoplankton abundance, diversity and richness. A total of 127 species were identified in 58 families. Euglenaceae was the most abundant family (13 species) and Anacystis sp. the most frequent species (100%). The most common genera were Microcystis and Anacystis, bioindicators of pollution. The site at which harvesting was most recently performed had more eutrophic species, while site harvested earliest (Site 5) had the least. These results are discussed with respect to how anthropogenic activities influence water quality, phytoplankton community structure, mangrove conservation and management. 相似文献
116.
(Eco)toxicity studies conducted according to internationally standardized test guidelines are often considered reliable by default and preferred as key evidence in regulatory risk assessment. At the same time regulatory agencies emphasize the use of all relevant (eco)toxicity data in the risk assessment process, including non-standard studies. However, there is a need to facilitate the use of such studies in regulatory risk assessment. Therefore, we propose a framework that facilitates a systematic and transparent evaluation of the reliability and relevance of (eco)toxicity in vivo studies for health and environmental risk assessment. The framework includes specific criteria to guide study evaluation, as well as a color-coding tool developed to aid the application of these criteria. In addition we provide guidance intended for researchers on how to report non-standard studies to ensure that they meet regulatory requirements. The intention of the evaluating and reporting criteria is to increase the usability of all relevant data that may fill information gaps in chemical risk assessments. The framework is publically available online, free of charge, at the Science in Risk Assessment and Policy (SciRAP) website: www.scirap.org. The aim of this article is to present the framework and resources available at the SciRAP website. 相似文献
117.
KMgSO4F:Ce and KMgSO4F:Mn phosphors were prepared by a wet chemical method and studied for their photoluminescence (PL) and thermoluminescence (TL) characteristics. PL emission of KMgSO4F:Ce peaked at around 440 nm for the excitation at 377 nm due to 5d → 4f transition, while KMgSO4F:Mn had a peak at 540 nm for an excitation at 363 nm and 247 nm due to 4T1g → 6A1g transition. The phosphors also showed good thermoluminescence characteristics when they were exposed to γ‐rays at a 5 Gy dose at the rate of 0.36 kGyh?1. KMgSO4F:Ce exhibited a single thermoluminescence (TL) peak at around 167 °C and KMgSO4F:Mn also exhibited a single TL peak at around 177 °C. Possible trapping parameters such as order of kinetics (b), the geometrical factor (μg), the frequency factor (s) and the activation energy were also evaluated by Chen's half width method. This article discusses fundamental PL and TL characteristics in inorganic fluoride material activated by Ce3+ and Mn2+ ions and prepared by a wet chemical method. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
118.
Catherine Richard Claude Delaude Louisette Le Men-Olivier Jean Le Men 《Phytochemistry》1978,17(3):539-541
The structure of a new bisindole alkaloid has been elucidated by chemical correlation and analysis of 13C NMR spectra. 相似文献
119.
Phenol hydroxylase was inactivated by the arginine reagents 2,3-butanedione, 1,2-cyclohexanedione, and phenylglyoxal. The cosubstrate NADPH, as well as NADP+ and several analogues thereof, protected the enzyme against inactivation. Phenol did not protect the activity against any of the reagents used, nor did modification by 2,3-butanedione affect the binding of phenol. We propose the presence of arginyl residues in the binding sites for the adenosine phosphate part of NADPH. 相似文献
120.
茶条木化学成分的研究 总被引:4,自引:0,他引:4
茶条木(Delavaya yunnanensis Franch)是无患子科独属独种植物,也是亚洲特有植物,是一种很好的油料植物,有润发、治疗疥癣等作用。本文采用多 方法首次从茶条木乙醇提取物中分离得到了十余种化学成分,并运用现代谐波学技术(MS,NMR)鉴定了其中九种化合物的结构,它们分别是:Nonaconsane,Nentriacontane,Triacontano,Dotriacontanol,Tatratriacontaol,β-Sitosterol,2-O-methylinositol,(-)-Epicatechin和Quercetin-3-O-β-D-glucoside. 相似文献