(n.) Something used to secure and hold in place something else, as a long fiat-headed nail, a catch a hook, a clinch, a clamp, etc.; hence, a support.
(n.) A conical or branching body, by which a seaweed is attached to its support, and differing from a root in that it is not specially absorbent of moisture.
Example Sentences:
(1) In addition, distribution of lead and cadmium varied within the individual producer (Fucus vesiculosus) in such a way that the holdfast exhibited the highest concentration followed by the apcial tip and the branches of the first dichotomy was the lowest.
(2) Thus, we propose that the attachment of the holdfast to the cell is a true adhesion process and that the stalk tip and base of the flagellum must have compositions distinctly different from that of the remainder of the caulobacter cell surface.
(3) Upon closer examination, they were distinguishable on the basis of protein band profiles on polyacrylamide gel electrophoresis, gross colony characteristics, or holdfast composition or by DNA restriction fragment length polymorphism analysis with flagellin and S-layer gene probes.
(4) The mutant could also attach to the discarded holdfast produced by a shedding mutant.
(5) Also, attachment to the cell is accomplished by bond formations that occur not only at the time of holdfast production.
(6) One class of mutants made a normal holdfast by all available criteria, yet the attachment to the cell was very weak, such that the holdfast was readily shed.
(7) Once attached the bacterium appears to undergo a complex life cycle which involves the development of a long filament divided into a number of segments within which holdfasts or spores are formed.
(8) Deletion and complementation analysis of the hfaAB locus revealed two genes in a single operon; both were required for holdfast attachment to the cell.
(9) The structure and distribution of papillae suggest that the ventral sucker likely functions as a holdfast organ and the oral sucker as a probing organ involved in feeding.
(10) The formation of the holdfast, cell walls and septa is followed.
(11) Within each mother cell two new holdfast segments developed.
(12) The paunch epithelium was densely colonized by bacteria, many of which possessed holdfast elements that secured them tightly to this tissue and to other bacterial cells.
(13) Caulobacters attach to surfaces in the environment via their holdfasts, attachment organelles located at the base of the flagellum in swarmer cells and later at the end of the cellular stalk in the stalked cells which develop from the swarmer cells.
(14) Taken together, the data support the interpretation that there is a specialized attachment site for the holdfast at the base of the flagellum which later becomes the end of the stalk, but not a specialized region of the holdfast for attachment to this site.
(15) The bacterium is attached to the epithelial cell by a special segment (holdfast) and causes specific changes in the epithelial cell at the site of attachment.
(16) This was unexpected, since holdfast deficiency is often a characteristic of pleiotropic mutants obtained when selecting for loss of other polar structures.
(17) This information suggests that the protein encoded by the hfaA locus may have a direct role in the attachment of the holdfast to the cell, whereas hfaB may be involved in the positive regulation of hfaC.
(18) A single prostheca extends from one pole of mature cells, and cells attach to various substrata by means of a holdfast located at the distal tip of the appendage.
(19) However, there was no subsequent division, or flagellum or holdfast synthesis.
(20) Alternately, in some filaments, newly formed but not yet released holdfasts were converted into endospores, which were released in the same manner as holdfasts, presumably to spread the bacterial colony to other members of the rodent population.
Steadfast
Definition:
(a.) Firmly fixed or established; fast fixed; firm.
(a.) Not fickle or wavering; constant; firm; resolute; unswerving; steady.
Example Sentences:
(1) While visitors amble freely around the newly refurbished inside – the Pierhead is sure and steadfast in its role outside as the drastic red building, emblazoning the landscape of Cardiff Bay in all its regal beauty.
(2) "Although she was always a steadfast critic of apartheid, she had a much better grasp of the complexities and geostrategic realities of South Africa than many of her contemporaries," he said.
(3) One of those convictions was his steadfast and passionate belief in the importance of the US-Saudi relationship as a force for stability and security in the Middle East and beyond.
(4) His remarks came as the Republican leadership in the US Senate remained steadfast in its opposition to filling the supreme court vacancy under Obama’s watch.
(5) In a statement, a spokesperson said that the Obama emphasised that the US “remains steadfast in [its] commitment to the security of Israel .” Netanyahu told Obama that Israel “vehemently opposes” the framework deal .
(6) But the county authorities, along with Montana's state election officials, have steadfastly refused to grant the request, offering a panoply of excuses, many of them contradictory.
(7) The present review is first and foremost a tribute to Monroe Eaton and his colleagues for their trail-blazing discovery of a major cause of the atypical pneumonia syndrome and their steadfast vision of its importance.
(8) By being steadfast in our values we can impel Russia to rethink its ambitions; by being mild we can encourage their cruellest actions.
(9) He argues that the previous EULA was more restrictive, but is steadfast that "ranks" and "kits" are ways to pay for progress and therefore not allowed – whatever they may (or may not) add to the experience.
(10) Why not?” May on Sunday told Fabian Picardo, the chief minister of Gibraltar, that the UK remained “steadfastly committed to our support for Gibraltar, its people and its economy”, according to the details of a telephone conversation released by Downing Street.
(11) I have also never been more encouraged by your dedication and steadfast commitment to our future.
(12) "Secretary Kerry has a proud record of over three decades of steadfast support for Israel's security and wellbeing, including staunch opposition to boycotts," Psaki said in a statement.
(13) "Donor agencies were given highly credible first-hand accounts of serious human rights violations during their field investigation, and they have chosen to steadfastly ignore these accounts," says the report, written by Will Hurd, an NGO worker who served as a translator for a team of DfID and USAid officials on a visit to the region in January 2012.
(14) Confronted with steadfast mission requirements, increasing demands for dental services, and a reduction of professional staff, the Corps has responded to challenge with the implementation of an alternative to the limitations of established and traditional concepts of practice.
(15) The prime minister, Tony Abbott, has steadfastly refused to do so, citing the Coalition’s long-held refusal to talk about operational “on-water” matters.
(16) Though framed by record high temperatures and an increasing number of extreme weather events, the Paris talks are already beset by the same problems that repeatedly dog climate change negotiations: the richest countries steadfastly refuse to meet legal commitments and shoulder their share of responsibility , preferring to uphold the desires of all-powerful corporate lobbies.
(17) But where some traditions were broken, others remain steadfastly in place.
(18) Her commitment went beyond this role and she remained steadfast to social work and the people it serves.
(19) Is steadfastly denying her son so admirable, when other parents remortgage and raid pensions to help their children on their way?
(20) The mayor has steadfastly refused to step down since reports emerged of a video of him smoking crack.