Dictionary » D » Difficult



1. Hard to do or to make; beset with difficulty; attended with labour, trouble, or pains; not easy; arduous.

difficult implies the notion that considerable mental effort or skill is required, or that obstacles are to be overcome which call for sagacity and skill in the agent; as, a difficult task; hard work is not always difficult work; a difficult operation in surgery; a difficult passage in an author. There is not the strength or courage left me to venture into the wide, strange, and difficult world, alone. (Hawthorne)

2. Hard to manage or to please; not easily wrought upon; austere; stubborn; as, a difficult person.

Synonym: Arduous, painful, crabbed, perplexed, laborious, unaccommodating, troublesome. See Arduous.

Origin: From difficulty.

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Chromosome Differences

I thing handling of large DNA molecule or chomosome may be difficult during replication or mitosis, so small DNA molecule selected during the course of evolution. We can see chromosomes number is usually increased from lower to higher eukaryotes or lower ...

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by josem
Wed Sep 03, 2014 8:47 pm
Forum: Genetics
Topic: Chromosome Differences
Replies: 5
Views: 302

Recommendations for Bacteria Detection?

I think you can use a hemocytometer to count the total bacteria present in the water. But it is difficult to count the motile bacteria hemocytometer. I suggest to use a disinfectant to kill the bacteria before counting.

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by josem
Fri Aug 01, 2014 7:30 pm
Forum: Microbiology
Topic: Recommendations for Bacteria Detection?
Replies: 1
Views: 527

Brain size=IQ level theory (Blacks vs Whites & Asians)

... if the culture discriminates against people with more melanin. It is the interaction between genetics and environment that makes it so difficult to fully understand how they each contribute to who we are. Alas, suffice it to say, this is controlled for if the non-identical twins are ...

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by wildfunguy
Wed Jul 30, 2014 8:20 pm
Forum: Human Biology
Topic: Brain size=IQ level theory (Blacks vs Whites & Asians)
Replies: 72
Views: 263503

Please check my answers.

... D. Darwin thought that organisms had to struggle to survive, while Lamarck thought that organisms could make adjustments when conditions became difficult. I think the answer is C or D. 5. When evolution was first proposed,which of the following was used as evidence to support the idea? A. observations ...

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by moondisyko
Fri Apr 04, 2014 9:00 pm
Forum: Evolution
Topic: Please check my answers.
Replies: 1
Views: 1207

AIDS Vaccination

... and what you think they should be doing to make it happen, I am curious as it is a very interesting virus and it has many qualities that make it difficult to deal with, such as it being very fast and being able to take over host cells, please post your thoughts below

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by superdan294
Sun Mar 30, 2014 11:17 am
Forum: General Discussion
Topic: AIDS Vaccination
Replies: 0
Views: 481
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