What's the difference between excrement and scummer?

Excrement

Definition:

(n.) Matter excreted and ejected; that which is excreted or cast out of the animal body by any of the natural emunctories; especially, alvine, discharges; dung; ordure.
(n.) An excrescence or appendage; an outgrowth.

Example Sentences:

(1) Total coliforms in 23 of 42, 7 days samples and excrement coliforms in 5 of 18, 3 days samples, were developed during the 38 days period.
(2) The higher activity in the experiments with less total areas is traced back to the excrement areas, which increased during experimental time and so reduced the lying area, which led to more unrest among the animals.
(3) Muslims are plotting to infect our food chain with their excrement,” said a man in his 60s, who refused to give his name.
(4) The dumping of excrement on the statue was “reprehensible and regrettable” and an investigation was under way, the university said in a statement last week.
(5) That is to say the proportionate representation of various defects is similar to each other when given biological excrements at different states of gonads are considered.
(6) There have been at least five recorded incidents of racial intimidation in east Belfast including a young Roma cyclist being showered with a bag of excrement on the Newtonards Road a fortnight ago.
(7) Microflora of the pharynx, nose, sputum and excrements was investigated.
(8) PoisonDwarf agreed: "I guarantee that the excrement is going to hit the rotary cooling device on this one.
(9) Larvae were proved to be able to survive 11 months in the environment, even if the eggs had been eliminated with excrements to the grass in July at a high temperature of 26 degrees C. For instance, the larvae Nematodirus, Ostertagia, Chabertia and Trichostrongylus, belonging to the most resistant, survived from the July of one year to the June of the subsequent year in a closed sheep-run located on the pasture and excluding a possibility of access of other animals.
(10) Y. enterocolitica was isolated from all the animals for slaughter (especially from the swine's pharynx and excrement, where pathogenic serotypes for man were isolated), this ascertainment has led the Authors to research the microorganism in foods of animal kind.
(11) From day 12 after infection, oocysts of cryptosporidia were found in the excrement.
(12) They are kept in overcrowded cells; they are denied toothbrushes, toothpaste, and soap; they are subjected to the constant stench of excrement and refuse in their congested cells [and] they are surrounded by walls smeared with mucus and blood,” said one passage of the lawsuit, which went on to name several more hardships.
(13) A regular disinfection of infected animal excrements is considered to be unrenouncable.
(14) coccidia in smears of gut contents and samples of excrements stained after Heine (1982) was investigated in calves at the age of 30 days, coming from 16 farms of central Bohemia.
(15) Dp 42 was purified from an acetone-precipitated mite-excrement extract by a combination of hydrophobic interaction chromatography on phenyl Sepharose and copper-chelate chromatography.
(16) After oral application the dyes showed a negative response in bile, excrements, and bone marrow.
(17) Transformer On paper, Duchamp invented a "transformer designed to utilise wasted energies", among them exhaled tobacco smoke, urine and excrement, ejaculation and tears.
(18) Secondly, there were changes to the system of disposal of excrement from cesspits to poorly organized pail and single-pan schemes which led to the causal disposal of sewage in the street gutters.
(19) The following characteristics were investigated: glycaemia, glycosuria, lactic acid concentration, plasma osmolality, hematocrit value, net acid-base secretion and excrement dry matter.
(20) However, as more cattle were dipped and the vat became polluted with dirt and excrement, settling occurred much more slowly.