Title: Oblique effect
Content:  As with geometrical-optical illusions the oblique effect can be examined at two levels. The physiological one looks at the neural apparatus. Much pertinent information has been gathered here, yet the phenomenon was discovered in, and has ultimate relevance to, the whole organism's performance. Hence it is not contradictory to follow two separate tracks of explanation.
Title: Oblique effect
Content:  Oblique effect is the name given to the relative deficiency in perceptual performance for oblique contours as compared to the performance for horizontal or vertical contours.
Title: Accordion effect
Content:  In physics, the accordion effect, known also as the slinky effect, concertina effect, elastic band effect, and string instability, occurs when fluctuations in the motion of a travelling body causes disruptions in the flow of elements following it. This can happen in road traffic, foot marching, bicycle and motor racing, and, in general, to processes in a pipeline. These are examples of nonlinear processes. The accordion effect generally decreases the throughput of the system in which it occurs.
Title: Fan effect
Content:  a person was paired with more than one location. Overall, these experiments demonstrated that multiple associations, such as including a large number of nouns in a sentence, interfered with the recognition time by producing a much slower effect. Association splitting, a self-help technique devised for individuals with obsessive-compulsive disorder (OCD), builds upon the fan-effect. In OCD, associations are typically constricted to OCD-related meanings (e.g., fire = danger, cancer = death). Patients are taught to contemplate alternative meanings to reduce the strength of fearful associations (e.g., fire = diamond, cancer = zodiac sign). According to a systematic review, the technique leads to a significant reduction of OCD symptoms relative to control conditions.
Title: List of effects
Content: Oberth effect (physics) ; Observer effect (information technology) (computer programming) ; Observer effect (physics) (physics) ; Observer-expectancy effect (cognitive biases) (cognitive psychology) ; Occlusion effect (biology) (otology) ; Octave effect (effects units) ; Okorokov effect (physics) ; Oligodynamic effect (biology and pharmacology of chemical elements) ; Online disinhibition effect (Internet culture) (psychology) ; Onnes effect (condensed matter physics) (fluid mechanics) (helium) ; Opposition effect (astronomy) (optical phenomena) (observational astronomy) (radiometry) (scattering, absorption and radiative transfer [optics]) ; Osborne effect (marketing) ; Ostrich effect (adages) ; Ouzo effect (Colloidal chemistry) (Chemical mixtures) (Condensed matter physics) (Soft matter) (Fluid dynamics) ; Overconfidence effect (cognitive biases) (psychological theories) ; Overjustification effect (educational psychology) (psychological theories) (psychology) ; Overview effect (spaceflight) (transcendence) (psychology) 
Title: Floodgate effect
Content:  A floodgate effect is situation in which a small action can result in a far greater effect with no easily discernible limit. The original analogy is that of a floodgate, which once opened, no matter how minutely, will allow water to flow from either side through the gate until both sides are balanced up. It may also be used to refer to the effect where, once a floodgate has been opened, water will gush out in a torrent through the gate, making it easier to continue to open the gate, but harder to close it. The term is commonly used to illustrate a situation where a precedent will set the stage for repeated performances, the number of which is hard to control. Such an example can be illustrated as follows: The setting up of a redlight district here will create a floodgate effect, causing redlight districts to be set up elsewhere.
Title: Ratchet effect
Content:  The ratchet effect is reflected in the Collingridge dilemma.
Title: Golem effect
Content:  the Golem effect were avoided. Oz & Eden designed a study in which military squad leaders were differentiated by treatment and control conditions. In the treatment condition, squad leaders' perceptions were manipulated as to believe that low scores on a physical fitness test were not indicative of a subordinate's ineptitude, whereas the control condition involved no manipulation. Thus, the Golem effect was measured indirectly through theoretically creating a "buffer" from the effect in the treatment condition. In this manner, the experimenters never actually created the Golem effect in their participants; rather, they measured a naturally occurring Golem effect in comparison to a "Golem treatment" group. There is evidence that even studies that directly generate and measure Golem effects in participants are 
Title: List of effects
Content: Wagon-wheel effect (optical illusion) ; Wahlund effect (evolution) (population genetics) ; Walker effect (illusions of self-motion) (spatial misconception) ; Walkman effect (computing and society) (technology) ; Wallace effect (evolutionary biology) (speciation) ; Warburg effect (biochemistry) (oncology) (photosynthesis) ; Wealth effect (economics and finance) (wealth) ; Weapons effect (gun politics) ; Weathervane effect (aviation terminology) ; Weissenberg effect (physics) ; Westermarck effect (psychology) (incest) ; Wet floor effect (computer graphic techniques) (computer graphics) (Web 2.0) ; Whitten effect (menstruation) ; Wien effect (electrochemistry) ; Wigner effect (condensed matter physics) (nuclear technology) (physical phenomena) (radiation effects) ; Wilson effect (astronomy) (Sun) ; Wilson–Bappu effect (physics) ; Wimbledon effect (economic theories) (economy of Japan) (economy of London) ; Windkessel effect (physiology) ; Withgott effect (linguistics) (phonetics) ; Wolf effect (scattering) (spectroscopy) ; Wolff–Chaikoff effect (iodine) (medicine) ; Woozle effect (psychology) (scientific method) (sociology) ; Word superiority effect (cognitive science) ; Worse-than-average effect (cognitive biases) (psychological theories) (social psychology) 
Title: Ovsiankina effect
Content:  The Ovsiankina effect is the tendency to pick up an interrupted action again when it has still not been achieved. It is named after its researcher, Maria Ovsiankina. The effect states that an interrupted task, even without incentive, values as a "quasi-need". It creates intrusive thoughts, aimed at taking up the task again and possibly resulting into cognitive dissonance. This can be explained by Kurt Lewin's field theory, which points that an interrupted action is condition for a strained system. It also leads to a better remembering of the unfinished action over a vacant one (Zeigarnik effect ).

Question: the oligodynamic effect is a phenomenon that describes?
Answer: a biocidal effect of metals.