(a.) Of or pertaining to the beginning or origin, or to early times; original; primordial; primeval; first; as, primitive innocence; the primitive church.
(a.) Of or pertaining to a former time; old-fashioned; characterized by simplicity; as, a primitive style of dress.
(a.) Original; primary; radical; not derived; as, primitive verb in grammar.
(n.) An original or primary word; a word not derived from another; -- opposed to derivative.
Example Sentences:
(1) Cloacal exstrophy, centered on the maldevelopment of the primitive streak mesoderm and cloacal membrane, results in bladder and intestinal exstrophy, omphalocele, gender confusion, and hindgut deformity.
(2) Evx-1 RNA is first detected shortly before the onset of gastrulation in a region of ectoderm containing cells that will soon be found in the primitive streak.
(3) As an extension of the previous study which indicated that mesoglea is a primitive basement membrane which has retained some characteristics of interstitial extracellular matrix, the present study was undertaken to analyze the role of mesoglea components during head regeneration in Hydra vulgaris.
(4) neuroblastomas, primitive neuroectodermal tumours (PNETs), rhabdomyosarcomas and malignant lymphomas.
(5) We concluded that the primitive eukaryote D.discoideum contains proteins which show functional and physical similarity with the alpha-subunits of vertebrate G-proteins.
(6) Mechanisms are suggested whereby rudimentary appetitive programs already encoded along facing dendrite membrane pairs within the specialized intrafascicular milieu, may trigger and control nipple search and suckling in the still blind and only primitively mobile neonate.
(7) Thus, the progeny of infected primitive multipotential cells are competent to express integrated proviruses.
(8) Multiple tuberculomas have simulated either an alcoolic encephalopathy in one case or a primitive cerebral tumour in another one.
(9) This increased cell flow down the early stages of the red cell pathway in CML suggests that heightened proliferation and differentiation of primitive hemopoietic cells may be a more general phenomenon than previously suspected in this disease.
(10) The Lerner & Lerner Scale for assessing primitive defenses is reviewed.
(11) Only tumors of astrocytic lineage like astrocytomas and glioblastomas, or tumors of mixed lineage as oligo-astrocytomas and multipotential primitive neuroectodermal tumors (PNET) expressed TNF-alpha-like immunoreactivity.
(12) This epithelial cell was tentatively identified as primitive extraembryonic endoderm by its ultrastructural appearance and its possession of cytokeratin intermediate filaments.
(13) The long-term culture corresponded to mouse MXT and MCF-7 cell lines whereas the primary culture corresponded to primitive breast cancers squashed onto histologic slides and maintained in cultures for between 12 and 48 h. Cell proliferation was evaluated by means of digital cell image analysis of Feulgen-stained nuclei.
(14) From these facts, it was concluded that the follicular, as well as acanthomatous, ameloblastoma is liable to undergo squamous differentiation, whereas the plexiform ameloblastoma remains in primitive stage of tumor differentiation.
(15) A cluster of spermatogonia may be derived from one primitive germ cell and it develops round a "Sertoli" cell.
(16) Shielded marrow self renewal capacity, a measurement reflecting primitive hematopoietic stem cell function, remained depressed and did not recover with time.
(17) In a 3-year-old child, a rare combination of a Dandy-Walker syndrome, a primitive trigeminal artery and a facial haemangioma was found.
(18) As the histochemical and ultrastructural findings are non specific, we believe, according to recent opinions, that this tumor could originate in a very primitive cell, able to differentiate to endocrine or exocrine elements, almost always incompletely.
(19) It is likely that the development of these malignancies is an expression of the multipotential nature of primitive germ cells.
(20) Morphology of the mature spermatozoon is modified from that of the classic primitive or ect-aquasperm type by having 1) the acrosome embedded in the nucleus (the only known example within the Mollusca), 2) a deep basal invagination in the nucleus containing proximal and distal centrioles and an enveloping matrix (derived from the rootlet), 3) laterally displaced periaxonemal mitochondria, and 4) a tail extending from the basal invagination of the nucleus.
Primordial
Definition:
(a.) First in order; primary; original; of earliest origin; as, primordial condition.
(a.) Of or pertaining to the lowest beds of the Silurian age, corresponding to the Acadian and Potsdam periods in American geology. It is called also Cambrian, and by many geologists is separated from the Silurian.
(a.) Originally or earliest formed in the growth of an individual or organ; as, a primordial leaf; a primordial cell.
(n.) A first principle or element.
Example Sentences:
(1) In contrast, in primordial follicles, FSH was restricted to the germ cell but was present in both the oocyte cytoplasm and germinal vesicle.
(2) Renal arteriography is therefore alone capable of answering two primordial questions: "Must surgery be undertaken and when operating, what surgical tactics to adopt".
(3) This primordial role explains the wide variety of tissues, ranging from the central and peripheral nervous system to the vascular system, that are affected by FGF during the late embryonic, neonatal, and adult phases of development.
(4) Indirect immunofluorescence studies with four monoclonal antibodies raised against carp spermatozoa revealed that monoclonal antibody WCS 29 stained the outer membranes of primordial germ cells in larvae from 3 days after fertilization.
(5) After the treatment in toto of the embryos from various species of Anura by cAMP, the number of primordial germ cells (PGC) in genital ridges is strongly reduced; the most part of the PGC are found in the endoderm.
(6) Mouse lymphocytes and STO fibroblasts were negative, whereas F9 teratocarcinoma cells, intestinal epithelial cells, and rat fetal primordial germ cells were all found to be highly positive for APase activity, in agreement with published results on APase localization in these cells.
(7) This sequence of events suggests that receptor formation may be induced by innervation of primordial cells within the epidermis.
(8) Laparoscopic directed ovarian biopsies show primordial follicles in one and a corpus luteum in the other.
(9) Plastic responses in leaf form resulting from ontogenetic or external influences are initiated very early in primordial development and are brought about by effects on the rate and direction of cell division and expansion in different regions of the primordium.
(10) The primordial ratio was supposed to shift to the modern one guided by the action of primitive nucleotides.
(11) Evidence suggests that cAMP production is not a primordial step in the response to androgen since dibutyryl cAMP did not mimick the androgenic effect, theophylline did not potentiate the response and alpha,beta-methylene ATP, which competitively inhibits adenyl cyclase, failed to alter the androgenic effect.
(12) In the ooplasm the transosome takes part in the development of primordial yolk granules.
(13) Moreau de Tours's classical studies about haschisch had pointed out to a rich symptomatology: visual and auditive hallucinations preceded by the "primordial effect": "the dissociation of ideas".
(14) The resulting space is not homologous with the primordial amniotic cavity; instead, it is a transitory tropho-epiblastic cavity.
(15) In embryos with 6.5-6.7 mm NRL, a part of the primordial proper esophagus extended to the dorsal side of the primordial stomach.
(16) Besides this areas of the primordial germinogen cell generation are found among the cells lining the system of labyrinths and channels of the yolk sac tumour.
(17) It is concluded that exposure of B6 mice to a single dose of MC results in atresia of oocytes in primordial and small primary follicles.
(18) Primordial germ cells (PGCs), which formed in 78% of cases when the presumptive ventral half to the embryo was cultured, occurred in only 48% of cases when the two ventral vegetal blastomeres were cultured alone.
(19) Sympathetic neurotransmitters have been shown to be present in the ovary of the rat during early postnatal development and to affect steroidogenesis before the ovary becomes responsive to gonadotropins, and before the first primordial follicles are formed.
(20) Gonadal biopsy was done on the patients, which disclosed no evidence of primordial follicles in one and severe reduction in the other.