Venezuela's oil is also of poorer quality than its Saudi equivalent. Its sour, heavy crude is difficult to extract and refine, while its high sulphur content makes it corrosive to pipelines. A resurgence of Venezuela's industry could pose problems for Canada, which produces similarly viscous oil and exports much of it to the US, but analysts reckon the risk is minor.
Guar gum, a plant colloid, costs less than agar and is better suited for growing thermophilic bacteria, but is also more difficult to handle, being more viscous and less transparent. The bacterial polysaccharide xanthan is cheaper as well but forms weaker jellies that, as with carrageenan, might result in puncturing its surface. Other colloids, like alginate (from brown seaweed) and gellan gum (from a bacterium), don’t set solely based on temperature and require additives for gelation. These additives might interfere with microbial growth and make the preparation of those jellies less handy than agar plates.，更多细节参见同城约会
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A Home Office minister, Mike Tapp, has rejected claims that the government failed to adequately communicate new border rules that could see British dual nationals barred from boarding flights to the UK. The former Conservative cabinet minister David Davis said three of his constituents only became aware of the changes through reporting by the Guardian and the BBC. Under the new rules, British dual nationals must present either a valid or expired British passport, or a £589 certificate of entitlement, to prove their right of abode before boarding a plane, ferry or train to the UK