What's the difference between bract and flower?

Bract


Definition:

  • (n.) A leaf, usually smaller than the true leaves of a plant, from the axil of which a flower stalk arises.
  • (n.) Any modified leaf, or scale, on a flower stalk or at the base of a flower.

Example Sentences:

  • (1) Enterobacter agglomerans was the most predominant bacterium on leaf and bract.
  • (2) Field-dried cotton bract, a contaminant of cotton dust, has been implicated in byssinosis pathogenesis.
  • (3) Cotton bract tannin is a potent stimulus for platelet aggregation and secretion.
  • (4) Byssinosis, COPD, cotton fever and cotton pneumoconiosis may be different types of responses due to the different duration of exposure, the different parts of bronchial tree (upper respiratory tract, small airway, and respiratory part) where deposition occurs, and the different components of cotton dust (broken cotton fibers, bracts, pericarps, bacteria, and fungi).
  • (5) Comparison of the cytotoxicity dose curves for aqueous bracts extracts with those for tannin demonstrated that tannin was the major cytotoxin present in bracts.
  • (6) Bract is the most abundant component in respirable raw cotton dust.
  • (7) After clearing and removal of the cuticle, the bracts are bleached, washed, dehydrated, and if studied by light microscopy, stained in 2% chlorazol black E and mounted in Diaphane; or, if studied by scanning electron microscopy, dried by the critical-point method and either left uncoated or coated with a film of various conductive metals.
  • (8) The human T lymphocyte proliferative response to cotton bract tannin was shown to be dependent upon the presence of monocytes.
  • (9) Pulmonary function measured by flow changes on partial expiratory flow volume curves was used to assess airway responses to the bract extracts after their inhalation by a panel of volunteers.
  • (10) The content of bract was unaffected by this harvest-aid practice.
  • (11) Raw cotton from 4 machine picked varieties and 2 machine stripped varieties is examined by stereomicroscope and bright-field microscopy for presence of plant trash(bract, leaf, stem, seed, boll, and weed fragments-size range 841-2000mum) that gives rise to cotton dust during yarn manufacturing operations.
  • (12) The effects of a water extract of cotton bracts (CBE) on guinea pig isolated trachealis smooth muscle was studied.
  • (13) The authors established an in vitro cytotoxicity assay using 51Cr release to assess time- and dose-dependent toxicity of condensed tannin, a component of bracts, on porcine aortic and pulmonary arterial endothelial cells.
  • (14) Senescence affected the population levels of the various genera on leaf and bract.
  • (15) The provenance of bristles and bracts suggests that the bristle cells move into their final positions.
  • (16) Mill workers are exposed to bract which has weathered in the field, but it is not known whether biologic effects of bract are due to intrinsic plant compound(s) or to contamination occurring during field weathering.
  • (17) To determine if constituents of cotton plants might play a role in byssinosis by injuring pulmonary epithelium, we added extracts of cotton dust, green bract, and field-dried bract to human A549 and rat type II pneumocytes.
  • (18) Macrophages obtained by bronchoalveolar lavage from volunteers pre-challenged with bract extract release increased amounts of chemotactic factor and superoxide anion.
  • (19) The role of nonspecific reactivity of the airways in this reaction to cotton bract extract is undefined.
  • (20) Extracts of cotton dust and field-dried bract produced significant dose- and time-dependent lysis and detachment of both target cells, while green bract extract was less damaging.

Flower


Definition:

  • (n.) In the popular sense, the bloom or blossom of a plant; the showy portion, usually of a different color, shape, and texture from the foliage.
  • (n.) That part of a plant destined to produce seed, and hence including one or both of the sexual organs; an organ or combination of the organs of reproduction, whether inclosed by a circle of foliar parts or not. A complete flower consists of two essential parts, the stamens and the pistil, and two floral envelopes, the corolla and callyx. In mosses the flowers consist of a few special leaves surrounding or subtending organs called archegonia. See Blossom, and Corolla.
  • (n.) The fairest, freshest, and choicest part of anything; as, the flower of an army, or of a family; the state or time of freshness and bloom; as, the flower of life, that is, youth.
  • (n.) Grain pulverized; meal; flour.
  • (n.) A substance in the form of a powder, especially when condensed from sublimation; as, the flowers of sulphur.
  • (n.) A figure of speech; an ornament of style.
  • (n.) Ornamental type used chiefly for borders around pages, cards, etc.
  • (n.) Menstrual discharges.
  • (v. i.) To blossom; to bloom; to expand the petals, as a plant; to produce flowers; as, this plant flowers in June.
  • (v. i.) To come into the finest or fairest condition.
  • (v. i.) To froth; to ferment gently, as new beer.
  • (v. i.) To come off as flowers by sublimation.
  • (v. t.) To embellish with flowers; to adorn with imitated flowers; as, flowered silk.

Example Sentences:

  • (1) Urban hives boom could be 'bad for bees' What happened: Two professors from a University of Sussex laboratory are urging wannabe-urban beekeepers to consider planting more flowers instead of taking up the increasingly popular hobby.
  • (2) A case is presented of deliberate chewing of the flowers of henbane (Hyoscyamus niger) in the hope of producing euphoria, and an account is given of the poisoning so produced.
  • (3) Malvidin chloride (MC) a colouring agent from flowers of Malvaviscus conzattii Greenum was studied for male anti-fertility effects in adult langur monkeys (Presbytis entellus entellus Dufresne).
  • (4) At Wembley England fielded: Springett; Armfield, McNeil; Robson, Swan, Flowers; Douglas, Greaves, Smith, Haynes, Charlton.
  • (5) I believe Flower when he promises he would not repeat his mistake.
  • (6) In these tissues, the viral DNA replicated at the site of inoculation and was transported first to the roots, then to the shoot apex and to the neighboring leaves and the flowers.
  • (7) I salute you.” So clear-fall logging and burning of the tallest flowering forests on the planet, with provision for the dynamiting of trees over 80 metres tall, is an ultimate good in Abbott’s book of ecological wisdom.
  • (8) "They were the real flowers in the show - boys who I picked up in the park because they looked right."
  • (9) Parietaria judaica (Pellitory-of-the-Wall) is native to the U.K., flowering from June to September, but is not usually considered to be of any clinical importance by U.K. allergists.
  • (10) New management at Lifeline changed the expenses policy to make it legally compliant and asked Flowers to pay the money back.
  • (11) These are collected in her pollen baskets which she takes back to the nest to feed the young after fertilising the flowers.
  • (12) Angela Merkel , who turns 60 on Thursday, thanked a German reporter who sang the traditional birthday song at a news conference in Brussels, and revealed that other leaders had given her flowers.
  • (13) Frahm witnessed how every morning Weiwei puts a flower into the basket of a bicycle just outside his studio, which he will continue until he is free again to ride it out through the gates.
  • (14) It is that rare flower, a positive environmental story.
  • (15) Jane Baxter's stuffed courgette flowers Stuffed courgette flowers Photograph: Rob White You can't get much more summery than courgette flowers – Jane Baxter's take on these light crispy fried delights (use a vegetarian parmesan-style cheese ).
  • (16) This study documents a previously unrecognized potential source of occupational pesticide exposure and suggests that safety standards should be set for residue levels on cut flowers.
  • (17) We suggest that both vertical transmission of Ty1-copia group retrotransposons within plant lineages and horizontal transmission between different species have played roles in the evolution of Ty1-copia group retrotransposons in flowering plants.
  • (18) I cracked a few jokes because I thought we had been through such a terrible event we need to laugh.” Facebook Twitter Pinterest A man lays flowers outside the synagogue in Copenhagen after two deadly shootings.
  • (19) The carcinogenic activity of petasitenine, a new pyrrolizidine alkaloid isolated from young flower stalk of Petasites japonicus, was studied in ACI rats.
  • (20) In both experiments, videotapes of model monkeys behaving fearfully were spliced so that it appeared that the models were reacting fearfully either to fear-relevant stimuli (toy snakes or a toy crocodile), or to fear-irrelevant stimuli (flowers or a toy rabbit).