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We have measured the distribution of intracellular calcium concentration in isolated single muscle fibres fromXenopus laevis using the fluorescent calcium indicator fura-2 with digital imaging fluorescence microscopy. Under control conditions, resting and tetanic calcium were uniform throughout a fibre. When fatigue was produced using a prolonged,(More)
During terminal differentiation, keratinocytes lose the ability to divide. One indicator of responsiveness to certain growth factors is a transient rise in the intracellular concentration of free calcium ions ([Ca2+]i). The aim of our experiments was to discover whether or not terminally differentiating keratinocytes have lost the ability to exhibit an(More)
Schubert (1984) and Kater et al. (1988) have suggested that motility and growth at the neuronal growth cone is activated by an increase of cytosolic free calcium concentration ([Ca2+]i) above the levels found in quiescent growth cones. In order to test this model, we have used a digital imaging fluorescence microscope together with injection of the(More)
Restoration of degraded land is recognized by the international community as an important way of enhancing both biodiversity and ecosystem services, but more information is needed about its costs and benefits. In Cambridgeshire, U.K., a long-term initiative to convert drained, intensively farmed arable land to a wetland habitat mosaic is driven by a desire(More)
Agriculture dominates the planet. Yet it has many environmental costs that are unsustainable, especially as global food demand rises. Here, we evaluate ways in which different parts of the world are succeeding in their attempts to resolve conflict between agriculture and wild nature. We envision that coordinated global action in conserving land most(More)
E xpansion of land area used for agriculture is a leading cause of biodiversity loss and greenhouse gas emissions, particularly in the tropics. One potential way to reduce these impacts is to increase food production per unit area (yield) on existing farmland, so as to minimize farmland area and to spare land for habitat conservation or restoration. There(More)
Institut für Biologie, Bereich Zoologie, AG Molekulare Ökologie, Martin–Luther-Universität, Hoher Weg 4, 06120, Halle, Germany P. O. Box 10960, 88810, Kota Kinabalu, Sabah, Malaysia King Mongkut’s University of Technology, Thonburi, 209 Rang Bua, Ratchaburi, Chom Bueng 70150, Thailand Agricultural Research Station, Lagud Seberang, 89908, Tenom, Sabah,(More)
B. kubahense J.J. Verm. & A. Lamb is described, a new species differing from B. refractilingue in having a longer rachis, longer lateral sepals and larger petals. This attractive species is known from a single locality within a national park in Sarawak, Malaysia. Nevertheless, wild-collected plants have turned up in nurseries in Singapore, causing concern(More)
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