Certain species of crustaceans have been shown to produce and secrete methyl farnesoate, which is juvenile hormone III lacking the epoxide group.

Certain plastic mulches also act as a barrier to keep methyl bromide, both a powerful fumigant and ozone depleter, in the soil.

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 terms are used very commonly for groups of holidays. I

Certain beliefs regarding the status of their past leader, and several of their outreach tactics and theology make them controversial in other orthodox groups.

Certain groups turn to destruction of property in order to immediately stop environmental destruction or to make visible arguments against forms of modern technology they consider detrimental to the earth and its inhabitants.

Certain Traditionalist Catholic groups, particularly Sedevacantists, consider Lumen Gentium to be the demarcation of when the Roman Church fell into heresy, pointing to the use of " subsistit in " rather than " est " as an abdication of the Church's historic ( and to them compulsory ) identification of itself alone as God's church.

Certain groups, like the Roma ( gypsies ), oppose organ donation on religious grounds, but most of the world's religions support donation as a charitable act of great benefit to the community.

Certain groups of seabirds called Common Murre migrate north by swimming.

Certain Jewish groups asked this be removed from the film.

Certain school rules pertain specifically to certain age groups, for instance, no one else may ride a San child's bicycle, and only Shack and Carriage children are allowed to build camp fires.

Certain groups, such as the Hutus of the Interahamwe, wish to eliminate the Pygmy and take the resources of the forest as a military conquest, using the resources of the forest for military as well as economic advancement.

Certain groups issued Aviation Safety Recommendations.

Certain Homotopy groups of n-connected spaces can be calculated by comparison with homology groups via the Hurewicz theorem.

Certain groups in the Lebanese National Movement wished to bring about a more secular and democratic order, but as this group increasingly included Islamist groups, encouraged to join by the PLO, the more progressive demands of the initial agenda was dropped by January 1976.

Certain subgroups of the Möbius group form the automorphism groups of the other simply-connected Riemann surfaces ( the complex plane and the hyperbolic plane ).

Certain groups of Dutch-speaking settler farmers (" Boers ") resented British rule, even though British control brought some economic benefits.

* Certain groups of fish have modifications to allow them to hear, such as the Weberian apparatus of Ostariophysians.

Certain groups of plants are soft, bulky, or otherwise not amenable to drying and mounting on sheets.

Certain groups, such as Orthodox Jews, have practiced endogamy as an inherent part of their religious beliefs and traditions.

Certain groups, notably Traditionalist Catholics, continue to practice Latin Mass.

Certain groups require a prospective pastor to be married before he can be ordained, based on the view ( drawn from 1 Timothy 3 and Titus 1 ) that a man must demonstrate the ability to run a household before he can be entrusted with the church.

Certain domestic groups, such as police and military units, would also sometimes lay wreaths at the monument.

Certain groups of Kenites settled among the Israelite population, including the descendants of Moses ' brother-in-law, though the Kenites descended from Rechab, maintained a distinct, nomadic lifestyle for some time.

Certain features we have touched upon: philosophy as a logical, deductive system from which a social science methodology can be built up ; ;

Certain systems can achieve truly negative temperatures ; that is, their thermodynamic temperature ( expressed in kelvin ) can be of a negative quantity.

Certain objects can contain other objects.

Certain limited information on Bankruptcy Law in Australia can be found at the ITSA web site.

Certain types of large random satisfiable instances of SAT can be solved by survey propagation ( SP ).

Certain attitudes can also make communication difficult.

Certain categories called topoi ( singular topos ) can even serve as an alternative to axiomatic set theory as a foundation of mathematics.

Certain medications can be prescribed to assist in weight loss.

Certain complex character combinations can only be accomplished in a double-byte language, giving rise to especially complex forms, sometimes known by their romanized Japanese name of kaomoji.

Harry Nyquist's 1924 paper, Certain Factors Affecting Telegraph Speed, contains a theoretical section quantifying " intelligence " and the " line speed " at which it can be transmitted by a communication system, giving the relation, where W is the speed of transmission of intelligence, m is the number of different voltage levels to choose from at each time step, and K is a constant.

Certain inks, such as those used in digital printers, and even those found in a common pen can be harmful.

Certain courts, particularly the United States Supreme Court and most state supreme courts, have discretionary jurisdiction, meaning that they can choose which cases to hear from among all the cases presented on appeal.

Certain Loa display very distinctive behaviour by which they can be recognized, specific phrases, and specific actions.

Certain Loa can become obstinate, for example the Ghede are notorious for wanting just one more smoke, or one more drink, but it is the job of the Houngan or Mambo to keep the spirits in line while ensuring they are adequately provided for.

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

Certain transparent materials with a small concentration of neodymium ions can be used in lasers as gain media for infrared wavelengths ( 1054 – 1064 nm ), e. g. Nd: YAG ( yttrium aluminium garnet ), Nd: YLF ( yttrium lithium fluoride ), Nd: YVO < sub > 4 </ sub > ( yttrium orthovanadate ), and Nd: glass.

Certain animals such as termites can digest cellulose, because bacteria possessing the enzyme are present in their gut.

Certain types of venom, such as those produced by venomous snakes, can also cause proteolysis.

Certain pathogens can also affect the p53 protein that the TP53 gene expresses.

Certain HPV types, in particular types 16 and 18, can also lead to progression from a benign wart to low or high-grade cervical dysplasia, which are reversible forms of precancerous lesions.

Certain processes such as freezing, pickling, smoking and salting can also be used to preserve food.

Certain revolvers, called double action only ( DAO ) or, more correctly but less commonly self cocking, lack the latch that enables the hammer to be locked to the rear, and thus can only be fired in the double action mode.

Certain enemies can perform particular actions.