However, other diseases such as influenza, yellow fever or AIDS are caused by pathogenic viruses, which are not usually classified as living organisms and are not, therefore, microorganisms by the strict definition.

However some microorganisms are pathogenic and can post health risk to other organisms.

However, if the immune system or " good " microbiota are damaged in any way ( such as by chemotherapy, human immunodeficiency virus ( HIV ), or antibiotics being taken to kill other pathogens ), pathogenic bacteria that were being held at bay can proliferate and cause harm to the host.

However, sometimes these same strains can become pathogenic.

However these signs do not necessarily mean that the pathogenic ( disease causing ) strains of honey fungus are a cause of plant decline or death, so other identification methods are advised before a diagnosis is made.

However, when a person becomes infected with this benign entamoeba, other pathogenic organisms may have been introduced as well, and these other pathogens might cause infection or illness.

However, unprecedented amounts of Corexit ( active ingredient: Tween-80 ), were sprayed directly into the ocean at the leak and on the sea-water's surface, the theory being that the surfactants isolate droplets of oil, making it easier for petroleum-consuming microbes to digest the oil.

However, it is important to note that the microbes will engage in growth and reproduction under moist atmospheres producing fruiting bodies ( mushrooms ).

However, unlike many parasitic microbes, Nanoarchaeum has many DNA repair enzymes, as well as everything necessary to carry out DNA replication, transcription, and translation.

However, there is one contemporary caveat: Paleobiologists and microbiologists in the 21st century no longer classify one-celled " animal-like " microbes either as invertebrates or as animals.

However, once food has been thawed, these microbes can again become active.

However, since boiling does kill most vegetative microbes and viruses, it is useful for reducing viable levels if no better method is available.

However, it is thought unlikely that microbes could survive at temperatures above 150 ° C, as the cohesion of DNA and other vital molecules begins to break down at this point.

However, there are also cultures of plants, fungi and microbes, including viruses, bacteria and protists.

However during the winter, the mats are usually dark green, because sunlight is more scarce and the microbes produce more chlorophyll to compensate, thereby masking the carotenoid colors.

However, most organic components of marine snow are consumed by microbes, zooplankton and other filter-feeding animals within the first 1, 000 metres of their journey, that is, within the epipelagic zone.

However, in recent decades, for what doubtless are multiple reasons, an unannounced but nonetheless readily observable shift has occurred in both facets of national activity.

However, in the context of legal and civic policy, these controversies are less than novel.

However, despite the insight of many of his observations, his own conclusions are open to suspicion because of his failure to employ at all times the correct research methods.

However, there are still several types of calls that necessitate the use of telephone operators.

However, he states unequivocally `` the scandals in business are far less significant than the scandals in labor ''.

However, few are taxed, and the owners and location of most boats are unknown to the assessors on the date of assessment of town valuations.

However, the surface temperature gradient can produce erroneous vapor-pressure measurements for the bulk liquid helium unless precautions are taken to isolate the tube ( which passes through the surface to the vapor pressure bulb ) from the liquid helium surface.

However, if their United States income is not subject to the withholding of tax on wages, their returns are due June 15, 1962, if they use a calendar year, or the 15th day of the 6th month after the close of their fiscal year.

However, the aircraft which we have today are tied to large, `` soft '' airfields.

However, some formulas are used more than others.

However, there is also much to be gained by making use of the abilities of the local people who are available and interested in recreation.

However, there are photographs of suspended drops of cyclohexanol phthalate ( viscosity 155 poises ) suspended in corn syrup of 71 poises in a paper by Mason and Bartok.

However, any oxygen nonequivalence would shorten either the already extremely short Af interlayer distance of 2.55 A or the non-hydrogen-bonded Af interlayer interactions which are already quite short at 2.58 Aj.

However, as so many of the records are not certainly based on newborn snakes, these data must be taken tentatively ; ;

However, if these procedures are applied more often, conditioned emotional responses are temporarily abolished.

However, it cannot be presumed, informal though the structure of the population seems, that there are not well-defined roles within the system.

However, the differences in procedure are fundamental.

However, the regionally differentiated results, which appear below in tables, are interesting evidence of the problems of developing self-government under even the most favorable circumstances.

However, if Federal funds are used, it would be entirely appropriate to train workers for jobs which could be obtained elsewhere as well as for jobs in the area of chronic unemployment.

However, it is not known to either the union or the public precisely how much of a cost increase is caused by a given change in the basic wage rate, although the companies are presumed to have reliable estimates of this magnitude.

However, there are relatively few such political constituencies, and, as has been pointed out, there is seldom a clear-cut distinction between the educational interests of one social class and those of another.

However, modesty and triviality are different qualities.

`` However, evidence that the Axis powers are making significant preparations indicative of such an intention is being reported with increasing frequency from a variety of sources.

However, his overall message is still harmful: Gays and lesbians are Christians – they're just not as good as straight ones.

However, in 2010 the Tokyo Metropolitan Government passed a bill to restrict harmful content.

However, this type of UV radiation is significantly less harmful to DNA, although it may still potentially cause indirect genetic damage in skin ( see ultraviolet for more about UV-A ).

However, this move was rejected by organizer Carlos Andrés Santiago, who stated that such an endorsement was harmful and criticized the AUC's actions.

He or she could fight or exorcise bad tuurngait, or they could be held at bay by rituals ; However, an angakkuq with harmful intentions could also use " tuurngait " for their own personal gain, or to attack other people and their tuurngait.

" However, the United States Environmental Protection Agency has recently posted a cautionary statement, warning that potentially harmful amounts of arsenic could be released from use of Ironite.

However, the duty to rescue where it exists may itself imply a shield from liability ; for example, under the German law of " Unterlassene Hilfeleistung " ( an offense not to provide first aid when necessary ), a citizen is obliged to provide first aid when necessary and is immune from prosecution if assistance given in good faith turns out to be harmful.

However, these penis extenders are controversial and most doctors recommend staying away from them due to their unknown and potentially harmful side-effects.

" However its platform calls for government subsidies for alternative energy, increased government spending on day care, education and medical care, tougher labour laws, the regulation of " casinos and bordellos ", the imposition of " strict limits on animal experiments ", and the continued prohibition of drugs " more harmful " than marijuana.

However, the disease is generally not a threat to most healthy individuals, and tends to lead to harmful symptoms only in those with a compromised immune system and the elderly.

However, the majority have no known beneficial or harmful effect.

However, this may not be the case or the other user may use the information given in harmful ways.

However, most introductions were ill-advised ; in most cases native fish had already proven to supply maximal control of mosquito population and introducing mosquitofish has been more harmful to indigenous aquatic life than to the mosquito population.

However, burning biodiesel and bioethanol ( see biofuel ) when created from virgin material, is increasingly controversial and may or may not be considered sustainable because it inadvertently increases global poverty, the clearing of more land for new agriculture fields ( the source of the biofuel is also the same source of food ), and may use unsustainable growing methods ( such as the use of environmentally harmful pesticides and fertilizers ).

However, this power also increases the level of infection of Kite's player character, randomly causing harmful side effects.

However, for most sleepwalkers, many experts advise putting away dangerous items and locking doors and windows before sleep to reduce risks of harmful activity.

However, as the harmful effects of X-ray radiation were properly considered, they finally fell out of use.

However he found the movement Freud was creating over-dogmatic, and resigned from the International Psychoanalytic Association in 1911, writing to Freud that " this'all or nothing ' is in my opinion necessary for religious communities and useful for political parties ... but for science I consider it harmful ".

" However, on January 31, 2009, the Government of Canada's final assessment concluded that exposure to vinyl acetate is not considered to be harmful to human health.

However, a recent meta-analysis of 68 reliable antioxidant supplementation experiments involving a total of 232, 606 individuals concluded that consuming additional β-carotene from supplements is unlikely to be beneficial and may actually be harmful, although this conclusion may be due to the inclusion of studies involving smokers.

However, in 1912, Food Inspection Decision 142 stated that saccharin is not harmful.

However, the robot refuses, as the operation is harmful and violates the First Law of Robotics, which says a robot may never harm a human being.

However, most disinfectants are also, by nature, potentially harmful ( even toxic ) to humans or animals.

However, the guidance hypothesis postulates that provision of too much external, augmented feedback ( e. g., KR ) during practice may cause the learner to develop a harmful dependency on this source of feedback ( Salmoni et al., 1984 ).