Some nudibranchs have smooth or warty backs and have no visible gill mechanism, such that respiration may likely take place directly through the skin.

Some groups, such as the sea slug nudibranchs, have lost their shells altogether, while in others it has been replaced by a protein support structure.

Some species of nudibranchs such as Pteraeolidia ianthina sequester whole living symbiotic zooxanthellae within their digestive diverticula, and thus they also manage to be " solar-powered ".

Some patients report fatigue or non-specific neurocognitive problems, such as an inability to concentrate ; this is sometimes called post-chemotherapy cognitive impairment, referred to as " chemo brain " by patients ' groups.

Some tests are visual, some are verbal, some tests only use abstract-reasoning problems, and some tests concentrate on arithmetic, spatial imagery, reading, vocabulary, memory or general knowledge.

Some chess pundits said she was unprepared for the tournament and appeared affected by the fact that she'd played less chess in the last three years to concentrate on her two children.

Some larger manufacturers of joysticks are able to customize joystick handles and grips specific to the OEM needs while small regional manufacturers often concentrate on selling standard products at higher prices to smaller OEM's.

Some offer a classical education ( Latin, Greek ), while others concentrate on economics and the like.

Some of the health complaints and symptoms reported by veterans of the Gulf War attributed to Gulf War syndrome are similar to those reported for MCS, including headache, fatigue, muscle stiffness, joint pain, inability to concentrate, sleep problems, and gastrointestinal issues.

Some classification systems concentrate on specific indicator crimes, such as murder, robbery, burglary and vehicle thefts.

Some species are known to be rather more specialised ; the Grey-backed Storm Petrel is known to concentrate on the larvae of goose barnacles.

Some of them may just concentrate on a single perspective.

Some classes concentrate on scale or semi-scale replicas of man-carrying aircraft.

Some styles may concentrate on particular musical styles, such as swing.

Some squash concentrates are quite weak, and these are sometimes mixed with one part concentrate and two or three parts water.

Some grandes écoles concentrate on a single subject area, such as engineering, sciences or business.

Some more recent meat analogues include textured vegetable protein ( TVP ), which is a dry bulk commodity derived from soy, soy concentrate, mycoprotein-based Quorn ( which uses egg white as a binder, making it unsuitable for vegans ), and modified defatted peanut flour.

Some tunicates can concentrate vanadium up to a level one million times that of the surrounding seawater.

Some types concentrate a load in the butt ( often a lead ball or steel ball-bearing ) to facilitate its use as improvised blackjack.

Some styles put most of their focus into the harnessing of qi, while others concentrate on competition.

Some keepers can become highly specialized such as those who concentrate on a specific group of animals like birds, great apes, elephants or reptiles.

Some social scientists have attributed the rise in parasite singles to the Japanese preference for community, and that the increased rate has more to do with people not being in long-term relationships, choosing instead to concentrate on their work and the infamously long hours of a traditional Japanese workplace.

Some believe that it was better to have students who were not bound for college concentrate on career schools, while academic students should spend class time learning core academic subjects such as history or science rather than job-shadowing at a hospital or auto dealer.

Some scouts are interested primarily in the selection of prospects, younger players who may require further development by the acquiring team but who are judged to be worthy of that effort and expense for the potential future payoff that it could bring, while others concentrate on players who are already polished professionals whose rights may be available soon, either through free agency or trading, and who are seen as filling a team's specific need at a certain position.

Some treatments, especially in the Baroque period, emphasize the drama, others concentrate on the nude ; a 19th century version by Francesco Hayez ( National Gallery, London ) has no elders visible at all.

Some critics of Watts thought he should concentrate on forcing deserters back into military service.

Some other ships happened to be in an optimal range for the English to concentrate their fire and took heavy damage.

Some amphibian toxins can be lethal to humans while others have little effect.

Some toxins produced by dinoflagellates such as brevetoxin and ciguatoxin are in a class known as cyclic or ladder polyethers.

Some red tides are associated with the production of natural toxins, depletion of dissolved oxygen or other harmful effects, and are generally described as harmful algal blooms.

Some of the toxins ( B and E ) also precipitate nausea and vomiting.

Some poisons are also toxins, usually referring to naturally produced substances, such as the bacterial proteins that cause tetanus and botulism.

Some plants ( e. g. bracken ) produce toxins that make their shoots inedible or less palatable.

Some food toxins can be reduced by pressure cooking.

Some anaerobic bacteria produce toxins ( e. g., tetanus )

Some toxins and venoms produced by reptiles and amphibians are useful in human medicine.

Some cells become senescent after fewer replication cycles as a result of DNA double strand breaks, toxins, etc.

Some insecticides have been banned due to the fact that they are persistent toxins which have adverse effects on animals and / or humans.

Some other toxins have no known antidote.

Some urge caution when taking cod liver oil and other fish-based supplements since they may contain elevated levels of toxins such as mercury and PCBs found in fish.

Some toxins, such as mercury, persist in the environment and accumulate.

Some species of predators have learned to measure the toxins by taste and reject butterflies with high cardiac glycosides contents, eating only the ones with low cardiac glycosides contents.

Some toxins, such as arsenic, can cause thick palms and soles.

Some species can tolerate quite high concentrations of specific toxins.

Some parasites like Toxoplasma gondii and Malaria can cause disease directly, but other organisms can cause disease by the toxins that they produce.

Some bacterial toxins are chemically altered and inactivated by the heat of cooking.

Some animals have digestive systems especially adapted to cope with certain plant toxins.

* Some bacteria deliver toxins directly from their cytoplasm to the cytoplasm of the target cell through a needle-like structure.

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Some of the most common naturally occurring brain toxins that lead to neurotoxicity as a result of excessive dosage are: Beta amyloid ( Aβ ), Glutamate and Oxygen radicals.