(a.) Having a head like that of a bull. Fig.: Headstrong; obstinate; dogged.
Example Sentences:
(1) No brown bullheads of ages 6 or 7 were collected in the Black River, while these age groups composed 18% of the catch in Old Woman Creek.
(2) The endocrine pancreas of the bullhead catfish, Ictalurus nebulosus, and the channel catfish, I. punctatas was studied by light and electron microscopy.
(3) In bullhead hepatocytes, epinephrine induced a biphasic [Ca2+]i response, with an initial transient rise followed by a sustained component; this response was virtually abolished in the absence of extracellular Ca2+.
(4) Ultrastructural, functional, and cytochemical characteristics of resident sinusoidal macrophages (RSM) in brown bullhead (Ictalurus nebulosus) liver were examined.
(5) Control bullhead brains had higher concentrations of glycogen, ATP, creatine phosphate (CrP), and glucose than control trout.
(6) PaO2 and ventilation measurements in Salmo gairdnerii and Ictalurus melas (brown bullhead) were performed during progressive or step changes of PwO2.
(7) Fresh or ripened spores of M. cotti and M. cerebralis were not infectious for bullheads or rainbow trout, respectively.
(8) The cerebellar afferents in the bullhead catfish (Teleostei) were labeled by relying on the retrograde transport of horseradish peroxidase (HRP).
(9) Established cell lines from brown bullhead catfish (BB) and rainbow trout (RTG-2) and primary cultures of cells derived from gill, fin, and gonad tissues from brown bullhead catfish were evaluated for use as bioindicators in the neutral red cytotoxicity assay.
(10) Black bullheads were able to accumulate 60Co from water.
(11) Possible mechanisms for elimination of the superfluous axons observed in the white muscle of the developing brown bullhead are discussed.
(12) The in vitro metabolism of [3H]benzo[a]pyrene (BP) and [14C]benzo[a]pyrene-7,8-dihydrodiol (BP-7,8-diol) by liver of brown bullhead (Ictalurus nebulosus) was characterized, as was the formation and persistence of BP-DNA adducts in vivo.
(13) No conversion occurred in the control tissue with the temperature maintained at 12 degrees C. No qualitative difference in the incorporation of [(3)H]leucine into proinsulin and its conversion into insulin at 12 degrees and 22 degrees C could be demonstrated between islet tissue from fish acclimated to less than 12 degrees C or to 22 degrees C. The results suggest that the enzyme(s) responsible for converting proinsulin into insulin in the bullhead may be temperature sensitive with low activity at 12 degrees C.
(14) A 3-MC-type of cytochrome P-450 appears to be primarily responsible for the oxidation of B f Q by control brown bullhead liver microsomes, whereas a phenobarbital-inducible type of cytochrome P-450 seems to be involved in the metabolism of B f Q by control rat liver microsomes.
(15) n. is described from the warmouth, Lepomis gulosus (Cuvier); brown bullhead, Ictalurus nebulosus (Lesueur); yellow bullhead, I. natalis (Lesueur); redbreast sunfish, L. auritus (Linnaeus); bluegill, L. macrochirus Rafinesque; spotted sunfish, L. punctatus (Valenciennes); and redfin pickerel, Esox americanus (Gmelin), from the Alabama River Drainage, brown bullhead from the Mobile Bay Drainage in Alabama, and pirate perch, Aphredoderus sayanus Gilliams, from an Atlantic Coast drainage in Georgia.
(16) These age and length distributions are consistent with the hypothesis that brown bullheads in the Black River were subjected to an age-selective mortality associated with high prevalences of liver carcinoma.
(17) Using degeneration staining methods, central projections of the olfactory tracts in the bullhead catfish, Ictalurus nebulosus were studied.
(18) Liver microsomes from rats were considerably more active in metabolizing benzo[f]quinoline (B f Q) than those from brown bullheads (Ictalurus nebulosus).
(19) Insulin biosynthesis in the brown bullhead, Ictalurus nebulosus (Le Sueur), was studied by measuring the incorporation in vitro of [(3)H]leucine into proteins of the principal islet.
(20) The antiviral effect of acyclovir (ACV; 9-(2-hydroxyethoxymethyl)guanine) on the replication of channel catfish virus (CCV), a poikilothermic herpesvirus, in brown bullhead cells (BB) was studied in vitro.
Stubborn
Definition:
(a.) Firm as a stub or stump; stiff; unbending; unyielding; persistent; hence, unreasonably obstinate in will or opinion; not yielding to reason or persuasion; refractory; harsh; -- said of persons and things; as, stubborn wills; stubborn ore; a stubborn oak; as stubborn as a mule.
Example Sentences:
(1) It has announced a four-stage programme of reforms that will tackle most of these stubborn and longstanding problems, including Cinderella issues such as how energy companies treat their small business customers.
(2) Of course there are some who are stubborn, like Robert Mugabe.
(3) The prime minister insisted, however, that he and other world leaders were not being stubborn over demands that the Syrian leader, President Bashar al-Assad, step down at the end of the peace process.
(4) It’s clear their relationship is most similar to that of a stubborn son and his long suffering mother.
(5) The contrast between these two worlds – one legal and flourishing, the other illegal and stubbornly disregarding of state lines – can seem baffling, yet it may have profound consequences for whether this unique experiment spreads.
(6) The causes of failure after acute injury include extensive local soft tissue and bony damage, severe concomitant head, chest or abdominal wounding, stubborn reliance on negative arteriograms in patients with probable arterial injury, failure to repair simultaneous venous injuries, or harvesting of a vein graft from a severely damaged extremity.
(7) "It was the character of David Cameron – his stubbornness, his anger and his rush towards war – which was the central cause of his defeat on Thursday night."
(8) Rebus, promised the Scottish author, will be "as stubborn and anarchic as ever", and will find himself in trouble with the author's latest creation, Malcolm Fox, of Edinburgh's internal affairs unit.
(9) A rising jobless total and an unemployment rate sticking at a stubbornly high 8% overshadowed a better than expected 27,100 fall in the claimant count in April, which compared with analysts' forecasts for a 20,000 drop.
(10) But the part of me that resists that, that is stubborn and wants to bulldoze things, gets in my way.
(11) One is the stubborn mystery of how a giant of its liberation movements, an intellectual who showed forgiveness and magnanimity years before Mandela emerged from jail, could turn into the living caricature of despotism.
(12) Sanctioning is no longer a last resort tactic aimed at the stubbornly workshy, say critics, but a crude way of pushing down claimant numbers and cutting back on the benefits bill.
(13) He was only 29 at the time, but nevertheless had that kind of stubborn certainty.
(14) They have a sort of stubbornness.” He later deals with hecklers at a Fifa HQ press event : “Listen, gentlemen, we are not in a bazaar .
(15) Dombrovskis stubbornly refused, instead pursuing "internal devaluation", depressing wages and conducting what he says was a 17% fiscal adjustment programme (the IMF says 15%).
(16) They formed a stubborn line in front of Wojciech Szczesny’s goal even if the statistics showed Arsenal’s pass-completion rate went down from 89% in the first half to 66% in the second.
(17) This was the first time a grouping of BME senior managers crossing health and social care had met together to look at barriers to gaining top jobs, and ways of breaking through systems which stubbornly never seem to shift.
(18) Broadly defined, this sort of behaviour involves procrastination, stubbornness, resentment, sullenness, obstructionism, self-pity and a tendency to create chaotic situations.
(19) At which point – obviously – you reach the stubborn limits of the debate: from even the most supposedly imaginative Labour people as much as any Tories, such heresies would presumably be greeted with sneering derision.
(20) A stubborn negativity characterised the insurrection.