(n.) A tree or shrub bearing cones; one of the order Coniferae, which includes the pine, cypress, and (according to some) the yew.
Example Sentences:
(1) Words included in this title include mistletoe, gerbil, acorn, goldfish, guinea pig, dandelion, starling, fern, willow, conifer, heather, buttercup, sycamore, holly, ivy, and conker.
(2) In our dog days this was a favoured spot, a conifer plantation where he could do no harm, a springy floored place without seasons where a wee up a tree was all he could leave behind.
(3) Differences in the rDNA content in Picea could contribute to the variation, in overall genome size, that has been observed within conifer species.
(4) Deciduous trees and conifers react differently to increased atmospheric CO2.
(5) The pollen grains of conifers are very weak allergens; their structure and function are different from those of the remaining flowering plants.
(6) The ability to grow in liquid media with D-xylose, xylan from decidous trees, and hemicelluloses from conifers was tested in 95 strains of 35 genera of yeasts and yeast-like organisms.
(7) With regard to an early diagnosis of defects within the photosynthetic system of conifers by air pollutants, we measured the chlorophyll fluorescence from microscopic parts of individual pine and spruce needles.
(8) The presence of the gidA gene on the chloroplast genomes of conifers may therefore be of significance with respect to the ability of these plants to synthesize chlorophyll in the dark.
(9) Similarities in linkage relationships among Scots pine, other pines, and other species within the Pinaceae support karyological research that suggests extensive conservation of the conifer genome.
(10) According to Weir, five conifer species account for 88% of all England’s softwood forests and five broadleaf species make up over 72% of its hardwood woodlands.
(11) Small numbers are present in algae, ferns, conifers, sponges, echinoderms, other marine animals, and arthropods.
(12) Conifers face axe to save British woodland Read more At the far side of the wood, spindly black-tipped ash seedlings began to appear, growing at the side of the path.
(13) Only the conifers were, as a group, unlikely to harbor INA bacteria.
(14) Dispersion of repetitive DNA by transposition, coupled with loss of the large inverted repeat, appears to have predisposed conifer cpDNA to a number of inversions.
(15) The size and number of aerial spray drops impinging on spruce budworm in its conifer forest habitat were determined by means of a new tracer method that uses fluorescent particles in a liquid spray.
(16) The evergreen Churchill Arms on Kensington Church Street becomes one enormous conifer each December.
(17) But the planting of new woods on open land, and conversion of broadleaf woodlands to conifers, has been a trend in Britain since Victorian times.
(18) • Felsham Road, Bradfield St George, Bury St Edmund's goodrobert Chopwell Wood, Rowlands Gill, Tyne and Wear Chopwell Wood is a conifer and mixed broadleaf wood.
(19) Much of the landscape is to be radically altered over the next 100 years as the Forestry Commission fells tens of millions of conifer trees to stimulate the growth of ash, beech, oak, hazel, field maple and other native broadleaved species.
(20) Higson’s first task in solving MK’s landscaping problem was “practical, rather ordinary gardening things”: planting semi-mature trees and fast-growing conifers to provide quick cover.
Cycad
Definition:
(n.) Any plant of the natural order Cycadaceae, as the sago palm, etc.
Example Sentences:
(1) Evidence is presented in support of the proposal that heavy use of certain toxic plants, notably cycads, a traditional source of food and medicine for the Chamorro people, plays an important etiological role.
(2) Since long periods may elapse between cycad exposure and the appearance of neurological disease in humans, cycads may harbor a "slow toxin" that causes the postmitotic neuron to undergo slow irreversible degeneration.
(3) We conducted an investigation of the levels of the neurotoxin 2-amino-3-(methylamino)-propanoic acid (BMAA) in cycad flour.
(4) Cycad nuts, widely used as human food in tropical and subtropical areas, contain a potent carcinogen, methyl azoxymethanol, which is more or less removed prior to use by leaching in water.
(5) Limited diversity was found among cyanobionts from a cultivated population of cycads at a field site in Florida.
(6) The DNA sequence of the small-subunit ribosomal RNA coding region for the cycad Zamia pumila L. was determined.
(7) It roamed a tropical island habitat 210 million years ago, racing around in herds and pausing from time to time to stand on hind legs to nibble with razor-sharp teeth on the leaves of palm-like cycad trees.
(8) Although cause-effect relationships cannot be established by epidemiologic studies alone, we have shown in all three affected population groups that individuals develop the amyotrophic lateral sclerosis variant of this disorder after heavy exposure to the raw or incompletely detoxified seed of neurotoxic cycad plants.
(9) 2-Amino-3-(methylamino)-propanoic acid (BMAA) is a neurotoxic, excitatory amino acid which has been linked through cycad use and consumption with the onset of a variant of amyotrophic lateral sclerosis occurring with high incidence in the western Pacific region.
(10) Sperm formation was studied in the fern, Marsilea, and the cycad, Zamia, with particular emphasis on the centrioles.
(11) However, such doses are orders of magnitude greater than those available from dietary or medicinal use of cycads.
(12) Methylazoxymethanol, a carcinogenic and hepatotoxic methylating agent prepared from cycad plants, has been found to be a good mutagen in Salmonella typhimurium.
(13) This paper explores the possible relationship between tumorigenesis and long-latency neurotoxicity, and discusses possible biologic markers of cycad exposure and subclinical neurodegenerative disease.
(14) The main points presented were (1) a definition of what is truly ALS, in the clinical and pathological sense, based on what is called "classical" ALS: (2) how neurons may be cultured to provide a valuable experimental tool; (3) the significance of lipid abnormalities in ALS and the characterization of the ALS-like syndromes produced by hexosaminidase A deficiency; (4) the possible role of autoimmune disease as it may accompany classical ALS and nerve growth factor derived from skeletal muscle; (5) the western Pacific form of ALS as it has been intensely studied and has given rise to two hypotheses on pathogenesis: mineral toxicity caused by secondary hyperparathyroidism and poisoning through ingestion of the cycad seed, and (6) the possible abiotropic interaction of one or many environmental toxins over a lifetime with the aging nervous system, depleting it of its frail reserve of neurons.
(15) There was no significant difference in the toxicity of extracts prepared from the female gametophyte tissue of C. circinalis, C. revoluta, and C. media, common wheat flour, and 13 of 17 cycad flour samples.
(16) DNA was prepared from cyanobacteria freshly isolated from coralloid roots of natural populations of five cycad species: Ceratozamia mexicana mexicana (Mexico), C. mexicana robusta (Mexico), Dioon spinulosum (Mexico), Zamia furfuraceae (Mexico) and Z. skinneri (Costa Rica).
(17) We believe that the cycad seeds which usually cause no immediate adverse symptoms when prepared and eaten as flour, or applied topically as medicine, can give rise to widespread and severe nerve cell degeneration after a latency of many decades.
(18) After weaning, groups of rats were fed a semi-purified diet containing fiddlehead greens (the unfuried frond of the ostrich fern Matteuccia struthiopteris), mature bracken fern (Pteridium aquilinum), or cycad meal (Cycas circinalis), or this diet plus aflatoxin B1.
(19) Methylazoxymethanol (MAM) is the short-lived toxic and carcinogenic aglycone of cycasin, a natural component of the cycad plant.
(20) Moreover, the complexity of restriction patterns shows that a mixture of Nostoc strains can associate with a single cycad species although a single cyanobacterial strain can predominate in the root of a single cycad plant.