Certain single-cell protists and algae also produce a rigid wall.

Certain gene / protein families, especially in eukaryotes, undergo extreme expansions and contractions in the course of evolution, sometimes in concert with whole genome duplications.

Certain government bureaucracies, such as a department of motor vehicles will issue an abstract of a completed transaction or an updated record intended to serve as a proof of compliance with some administrative requirement.

Certain specific conditions are excluded as disabilities, such as current substance abuse and visual impairment that is correctable by prescription lenses.

Certain indigenous religious groups such as the Australian Aborigines are more typically totemic, whereas others like the Inuit are more typically animistic in their worldview.

Certain high church services and other musical events in liturgical churches ( such as the Roman Catholic Mass and the Lutheran Divine Service ) may be a cappella, a practice remaining from apostolic times.

Certain indigenous Dayak people ( such as the Kayan, Kenyah, Lun Bawang / Lun Dayeh, Punan Bah and Penan ) living on the island have been struggling for decades for their right to preserve their environment from loggers and transmigrant settlers and colonists.

Certain names of places, such as Streetsboro, OH, Greensboro, NC, and Maynesborough, NH reflect the historical use of Borough as a geographical scale in the United States.

Certain international trade laws, such as those on intellectual property, are also enforced in India.

Certain viruses such as Hepatitis B and human papilloma viruses have been found to cause cancer in humans.

* Certain kinds of memory leaks, in which a program fails to free memory occupied by objects that have actually become unreachable, which leads to memory exhaustion if such a behavior is repeated indefinitely.

Certain Jewish thinkers, such as Maimonides, believed that concubines are strictly reserved for kings, and thus that a commoner may not have a concubine ; indeed, such thinkers argued that commoners may not engage in any type of sexual relations outside of a marriage.

Certain Brezhnev appointees were kept, such as Viktor Chebrikov and Nikolai Savinkin.

Certain devices, such as avalanche diodes, deliberately make use of the effect.

Certain drawing methods or approaches, such as " doodling ," other informal kinds of drawing, and the surrealist method of " entopic graphomania ", in which dots are made at the sites of impurities in a blank sheet of paper, and lines are then made between the dots, may or may not be considered part of " drawing " as a " fine art ".

Certain non-standard regional and economic class-associated dialects do decline the article, either in regular speech or in slang-as in expressions such as " How do you like them apples?

Certain forms treat all knowledge as empirical, while some regard disciplines such as mathematics and logic as exceptions.

Certain other genera of symbiotic amoebae, such as Endamoeba, might prove to be synonyms of Entamoeba but this is still unclear.

Certain popular stories, such as the Prodigal Son and the Good Samaritan, are found only in this gospel.

Certain countries such as the United Kingdom are unaffected as they maintain more stringent gun control laws than those effectively set as a minimum by the European Union.

Certain initiates such as Alex Sanders and Raymond Buckland who brought his take on the Gardnerian tradition to the United States in 1964 started off their own major traditions allowing further expansion.

Certain European ritual traits such as the significance of the number 3, the importance of the head and of water sources such as springs remain in the archaeological record, but the differences in the votive offerings made at the Roman Baths ( Bath ), Bath, Somerset before and after the Roman conquest suggest that continuity was only partial.

Certain scholars and political leaders feel that these modern developments endanger nation states by taking power away from state governments and ceding it to international bodies such as the U. N. and the World Bank, argue that international law has evolved to a point where it exists separately from the mere consent of states, and discern a legislative and judicial process to international law that parallels such processes within domestic law.

Certain host symptoms, such as aching muscles and fever, are related to the production of IFNs during infection.

Willard Thorp, in his new book, American Writing In The Twentieth Century, observes, quite validly it seems: `` Certain subjects are conspicuously absent or have been only lightly touched.

Certain other deductions are not allowed in determining Adjusted Gross Income.

Certain pianistic traits are common to all five Schnabelian renditions, most notably the `` Schnabel trill '' ( which differs from the conventional trill in that the two notes are struck simultaneously ).

Certain other properties of small particles, in addition to those already mentioned in connection with penetration of the respiratory tract, are noteworthy in defense considerations.

Certain badly disillusioned market critics are often apt to feel that there is something somehow unfair, dirty, or even thoroughly criminal about this interplay of competitive forces.

Certain stones, when examined in thin sections by transmitted light, show a diffraction spectrum due to the extreme delicacy of the successive bands, whence they are termed rainbow agates.

Certain object types, including ACIS solids and regions, are not documented.

Certain natural substances are reputed to have anxiolytic properties, including the following:

Certain other state agencies enjoy considerable operational independence and autonomy ; they include the electrical power, the nationalized commercial banks ( which are open to competition from private banks ), and the social security agency.

Certain elements have no stable isotopes and are composed only of radioactive isotopes: specifically the elements without any stable isotopes are technetium ( atomic number 43 ), promethium ( atomic number 61 ), and all observed elements with atomic numbers greater than 82.

Certain people are known even to people unfamiliar with the area in which they excelled.

Certain sub-castes are shunned more than others.

Certain Latin-Rite Catholic priests may receive a dispensation to be married before ordination, and all Eastern Catholic priests outside the United States are also permitted to be married, provided they are so before ordination.

Certain forms of the gene are associated with a mild form of epilepsy.

Certain aspects of XP have changed since the book Extreme Programming Refactored ( 2003 ) was published ; in particular, XP now accommodates modifications to the practices as long as the required objectives are still met.

Certain combinations can cause lethal reactions, common examples including SSRIs, tricyclics, MDMA, meperidine, tramadol, and dextromethorphan.

Certain examples of this bicycle type have become collectors ' items, with potential values of several thousand dollars.

Certain models of sound cards have been fitted with dedicated processors providing digital multichannel mixing and real-time DSP effects as early as 1990 to 1994 ( the Gravis Ultrasound and Sound Blaster AWE32 being typical examples ), while the Sound Blaster Audigy and the Sound Blaster X-Fi are more recent examples.

Certain languages have both a classical form and various vernacular forms, with two widely-used examples being Arabic and Chinese: see Varieties of Arabic and Chinese language.

Certain locations are specifically enumerated as examples of PEs, including branches, offices, workshops, and others.

Certain examples of regioselectivity have been formulated as rules for certain classes of compounds under certain conditions, many of which are named.

Certain distinctively Treveran names are apparently none of the three and may represent a pre-Celtic stratum, according to Wightman ( she gives Ibliomarus, Cletussto and Argaippo as examples ).

Certain examples of the M1918 had cutouts in the rim along the sides of the helmet.

Certain derecho situations are the most common instances of severe weather outbreaks which may become less favourable to tornado production as they become more violent ; the height of the 30 – 31 May 1998 upper Middle West-Canada-New York State derecho and the latter stages of significant tornado and severe weather outbreaks in 2003 and 2004 are only three examples of this.

Certain types of supplies are free of GST, examples include fresh unprocessed food, medical services, education courses, childcare, exports, pre-owned real estate and going concerns.

Certain southern African countries such as Namibia, Angola, and Mozambique, where procedural elections are conducted through international assistance, are possible examples of procedural democracies.

Certain reports can be added by the police which relate to the vehicle or occupant status ; examples include if the occupants are believed to be involved in crime or are missing, if the vehicle is stolen, if the vehicle is believed to be cloned etc.

Certain examples were delivered new without pantographs and ran with the recess vacant for some time.