(n.) An ament; a species of inflorescence, consisting of a slender axis with many unisexual apetalous flowers along its sides, as in the willow and poplar, and (as to the staminate flowers) in the chestnut, oak, hickory, etc. -- so called from its resemblance to a cat's tail. See Illust. of Ament.
Example Sentences:
(1) The extracts with the broadest spectra of activity were prepared from: Alnus rubra bark and catkins, Fragaria chiloensis leaves, Moneses uniflora aerial parts, and Rhus glabra branches.
(2) Dot immunoblotting of crude extracts of various aerial parts of birch trees, using patient serum rich in birch pollen IgE, showed IgE-binding activity in leaves, buds, twigs, seeds, bark, and old male catkins.
(3) Ginger, pippali (native to India; also called dried catkins), pepper, and garlic showed the highest activity followed by asafetida, mustard, and horse-gram (native to India).
(4) The current 2012 edition maintained the changes, and instead of catkin, cauliflower, chestnut and clover, today’s edition of the dictionary, which is aimed at seven-year-olds starting Key Stage Two, features cut and paste, broadband and analogue.
(5) Hazel catkins were profuse, catching out hay fever sufferers late in the month.
(6) • Hazel catkins, which usually appear in March and April, appeared early in autumn at Washington Old Hall, Tyne and Wear, for the second year running • Mammals generally entered the winter in good condition, especially badgers, wild deer, and the wild sheep and goats in Cheddar Gorge.
(7) You can also lobby your local council to get trees planted that are bee-friendly, such as hazel and alder whose catkins provide a vital source of pollen in the spring, when the bees need this protein to feed to their young, expanding colony.
(8) Mica flecks in ancient granite shone like gold dust in caramel-coloured streams, beech trees were decorated with delicately suspended catkins and the upland breezes infused with coconut-like scent from early flowering gorse.
Unisexual
Definition:
(a.) Having one sex only, as plants which have the male and female flowers on separate individuals, or animals in which the sexes are in separate individuals; di/cious; -- distinguished from bisexual, or hermaphrodite. See Di/cious.
Example Sentences:
(1) We examined mitochondrial DNA (mtDNA), enzyme, and morphological variation among 17 unisexual Ambystoma of hybrid origin.
(2) The levels of specific antibodies were much higher in bisexual infection than in unisexual infection and closely related to the intensity and duration of infection.
(3) Chromosomes of the Amazon molly, Poecilia formosa, a unisexual species of hybrid origin, were investigated by C-banding, silver staining, and fluorescent staining with DAPI, quinacrine dihydrochloride, and chromomycin A3.
(4) This reduction coincided with the late stages of the infection and was also observed in unisexual infection with male worms.
(5) These data, together with unisexuality, demonstrate conclusively that the all-female R. ridibunda population at Trubeschloo originated from matings between two R. esculenta.
(6) Unisexually developed males incubated for 1 h in EBSS showed both lipid accumulation and release from the dorsal surface.
(7) Skin graft evidence is used to directly identify the unisexual parent of natural hybrids produced between the bisexual species Cnemidophorus inornatus and the unisexual Cnemidophorus neomexicanus.
(8) Additional studies carried out in mice after unisexual infection revealed that egg production is not a necessary prerequisite for several of the immunologic phenomena associated with acute schistosomiasis.
(9) Further experiments were performed to determine light preferences during oviposition when unisexual and bisexual females were in direct competition.
(10) Cnemidophorus uniparens is a parthenogenetic unisexual species of lizard in which each individual develops as a female, making it a unique animal model for the study of sexual differentiation.
(11) Mice were infected with fertile bisexual Schistosoma mansoni and compared with similar animals infected with unisexual worms or sterile bisexual worms.
(12) The results revealed: (1) three unisexual grooming subgroups; (2) two focal monkeys (one female and one male) which were each avoided by five animals, one female avoided by three animals, the rest avoided by one or none; (3) that each monkey was 'friendly' with one to three others and was 'antagonistic' toward all the rest; (4) that males were socially inactive, ranked below most females, associated primarily with each other, and, in this study, were killed by females during the mating period.
(13) This confirms our previous conclusion that the evolution of the parthenogenetic mode of reproduction and expression of male-like pseudosexual behavior that are characteristic of the unisexual C. uniparens has not been accomplished by evolutionary modifications in the pattern of sex steroid hormone secretion.
(14) Three populations of the North American cyprinodont fish Poecilia latipinna, considered to be one of the progenitor species of the gynogenetic unisexual P. formosa, were analyzed by C-banding and Ag-staining.
(15) Hence the unisexually grouped females were unable to perceive the pheromone from males and continued to remain in anoestrus following exposure to perfumed males.
(16) By hybridizing bisexual (gonochoristic) fishes, all-female clones have been produced that are comparable to those of a wild unisexual "species," Poeciliopsis monacha-lucida, living in northwestern Mexico.
(17) Parthenogenesis can only evolve in areas devoid of the generating bisexual species, because such species would prevent newly formed unisexuals from establishing clones due either to hybridization or competition.
(18) When assayed as separate unisexual groups, the oxygen uptake of male and female macrofilariae of both species was inhibited by classical inhibitors of respiratory electron transport (RET), and showed classical substrate bypass phenomena in response to succinate and ascorbate, N,N,N',N'-tetramethyl-p-phenylenediamine with respect to the RET inhibitors rotenone (inhibitor of complex I) and antimycin A (inhibitor of complex III).
(19) At 24 h post-culture females paired with males from mixed infections had an elevated uptake of [3H]thymidine compared to females that had not paired and uptake was also significantly different (P less than or equal to 0.001) from females exposed to males from unisexual infections.
(20) Both bisexual and unisexual male worm low infections were produced, and studied for as long as 27 weeks post-exposure.