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Production of clear guava nectar
International Journal of Food Science & Technology, 1992SummaryThree fining methods were tested for use in producing clarified guava nectar. The enzyme hydrolysis method, especially treating the guava purée with 1000ppm of pectinase at 50°C for 3 h, accomplished satisfactory clarification but caused severe losses in volatile components, pre‐treating the purée with 100ppm of pectinase for 1 h greatly ...
WAI‐YUNG CHAN, BEEN‐HUANG CHIANG
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Nectar Production in Abutilon I. Movement of Nectar Through the Cuticle
Australian Journal of Biological Sciences, 1971Observations by light microscopy of the process of exudation of nectar from the nectary hairs of Abutilon show that the nectar passes through the relatively impermeable cuticle in discrete droplets at regular intervals. From the observations it is concluded that there are pores through the cuticle at the hair tips which act as valves to produce these ...
Nele Findlay, FV Mercer
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Floral nectar production: what cost to a plant?
Biological Reviews, 2023ABSTRACTFloral nectar production is central to plant pollination, and hence to human wellbeing. As floral nectar is essentially a solution in water of various sugars, it is likely a valuable plant resource, especially in terms of energy, with plants experiencing costs/trade‐offs associated with its production or absorption and adopting mechanisms to ...
Graham H. Pyke, Zong‐Xin Ren
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Determinants of nectar production in heather
Journal of Apicultural Research, 2016With the aim of contributing to the development of decision support tools for migratory beekeepers in their planning for hive movements to heathlands in time and space, models were developed from analyses of heather flowering, nectar secretion, sugar concentration, and weight of bee hives in relation to meteorological parameters across two seasons in ...
Enkegaard, Annie +2 more
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Calculating nectar production rates: residual nectar and optimal foraging
Oecologia, 1983Bumblebees, when foraging for nectar in flowers of Aconitum columbianum, do not consistently drain them of reward. The amount of residual nectar varies among sites, times and species of bee. At times, residual nectar can be a significant percentage of total 24 h production strongly suggesting that, if nectar secretion rates are to be studied, flowers ...
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Nectar: Its Production and Functions in Trumpet Creeper
Science, 1975Studies of the trumpet creeper, Campsis radicans (L.) Seem. (Bignoniaceae), reveal five distinct nectary systems, a phenomenon never before reported among temperate zone plants. Ant activity, centered around the four extrafloral systems, clearly demonstrates the ant-guard symbiosis usually associated only with ...
T S, Elias, H, Gelband
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Nectar production and presentation
2007Nectar secretion is complicated to study from the ultrastructural point of view because it is a dynamic process involving many tissues simultaneously. Study may also be affected by artefacts created by chemical fixation procedures, although this problem can be overcome by freeze-drying and freeze substitution techniques (Zhu & Hu, 2002; Stpiczyńska et
PACINI E., NEPI M.
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Dynamics of Nectar Production and Nectar Homeostasis in Male Flowers of Cucurbita pepo L.
International Journal of Plant Sciences, 2011Male flowers of Cucurbita pepo L. cv. Alberello di Sarzana produce nectar in the first hours of anthesis (5:00 a.m.–8:00 a.m.). However, nectar production ceases soon after 9:00 a.m. Removal of nectar had no effect on total nectar volume and sugar concentration.
Nepi, Massimo +3 more
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Nectar Production and Pollination of Asclepias exaltata
Systematic Botany, 1986Nectar production and pollination of the herbaceous perennial milkweed Asclepias exaltata were studied in three populations in southwestern Virginia. Individual flowers were available to pollinators, chiefly large bees and wasps, an average of 6.2 days. Volumes, concentrations, and amounts of sucrose in nectar decreased as flowers aged. Most nectar was
Robert Wyatt, T. Randolph Shannon
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Determinants of nectar production in oilseed rape
Journal of Apicultural Research, 2016With the aim of contributing to the development of models forecasting the melliferous characteristics and the potential honey yield of oilseed rape, we analyzed data on the temporal pattern of number of oilseed rape flowers, nectar secretion, sugar concentration, and weight of bee hives in relation to meteorological parameters, across three seasons of ...
Enkegaard, Annie +2 more
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