Orchids of Africa
A Select Review
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Scientific intelligence
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Enzymic Conversion of Tetrahydrofolic Acid to Folinic Acid by Plant Protein
ENZYMIC synthesis of folinic acid (CF) has been investigated in a variety of cells of both bacterial and animal origin1–7.
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Physiology and descent
Introduction to animal physiology and physiological genetics
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A procedure for obtaining lower bounds for ground state energies of atoms and molecules
Using Löwdin's partition method we have re-derived the D. Weinstein lower bound, E > H 11 - σ. By the same method, plus the assumption that the calculated first excited state energy is lower than a certain weight...
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Biometrical genetics with one or two loci I. The choice of a specific genetic model
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Biometrical genetics with one or two loci II. The estimation of linkage
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Cross-Sectional Echocardiographic Assessment of Severity of Aortic Stenosis in Children
In a recent report we described the relationship of the maximum aortic cusp separation determined during long axis cross-sectional scanning of the aortic valve to the severity of aortic stenosis in adults. In ...
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Long-term lead accumulation in abalone (Haliotis spp.) fed on lead-treated brown algae (Egregia laevigata)
In this study we assessed the amount of lead accumulated in the body of a grazing mollusc by transfer from its algal food in laboratory experiments, and compared these results with the amounts found in natural...
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Relative sensitivity to lead of a naked green flagellate, Dunaliella tertiolecta
Cells of Dunaliella spp., unicellular marine green algae, differ from most other plant cells in lacking a cell wall. The responses of D. tertiolecta Butcher (DUN clone) (WHO I) when grown in a synthetic sea-water...
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A new pressure measuring system for cushions and beds—with a review of the literature
An interface pressure measuring device for the assessment of subject-cushion interface pressures at ten points has been described. Preliminary trials using 12 healthy subjects on four cushions and three spinal...
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Book
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A Record of the Orcbidaceae in Africa
The order in which the tribes and subtribes are listed is the same as that of Dressier (1974), whose classification within the orchid family is followed in this book.
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Introduction
One hundred different genera of orchids are known from the part of the African continent that lies south of the Sahara. Over half of these are never found beyond its shores, and a further quarter is found, els...
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The Habits of African Orchids
Orchid plants are always perennial and most of the different habits that their growth forms may exhibit are represented among the species that occur in Africa. The majority are herbaceous plants. About half of...
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The Seed and Seedling
Orchids are notorious for the prodigality of their tiny seeds. Over a hundred years ago Darwin recorded an average of more than six thousand seeds in the capsule of a small British orchid, and reported another...
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Details of the Orchid Plants
Anchorage and absorption are the primary functions of all orchid roots, and in many terrestrial species food storage and perennation are important too.
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Pollination
The symmetry and detail of orchid flowers indicate that they are designed to be pollinated by insects. The transfer from one flower to another of enormous numbers of pollen grains is essential for the fertilis...
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Details of the Flowers
Orchid flowers may be arranged on the plant in five different ways, as a simple spike, raceme or umbel, occasionally solitary and sometimes in a branching panicle, and these are described in detail below. Ther...
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Selected Species of African Orchids
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The incidence and epidemiology of retinoblastoma in New Zealand: a 30-year survey
One hundred cases of retinoblastoma were diagnosed in New Zealand-born children between 1948 and 1977 inclusive. Five patients had an affected parent, and of the remaining sporadic cases 25 had bilateral and 7...
