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91. We have seen how difficult it is to extract hydrogen and water from the Moon profitably.

92. The group, like other environmental activists, would prefer the use of hydrogen alone to generate power for fuel cells.

93. Instantly, one of the hydrogen atoms on the ethanol molecule is ripped off.

94. In order to split water into oxygen and hydrogen, we would have to supply energy.

95. The transient nature of the binding may be because this sequence is recognized on account of its structure without additional hydrogen bonding contacts.

96. It is now believed that the peculiar properties of water are due to what is known as hydrogen bonding.

97. For all they know, metal hydrogen may always be unstable and quickly vaporize.

97. Sentencedict.com is a online sentence dictionary, on which you can find nice sentences for a large number of words.

98. Typically, the fuels are isotopes of the three lightest elements, hydrogen, helium, and lithium.

99. He seems convinced of the inherent stability of the hydrogen bomb - after all, he does build the damn things.

100. Expressed as the proportion of carbon to hydrogen, fuelwood is roughly 91 percent carbon.

101. The microcosm becomes the macrocosm: the key to the whole universe may well be hidden in one hydrogen atom.

102. In general coals contain carbon, hydrogen, oxygen[sentencedict.com], nitrogen and sulphur with various other trace elements.

103. It therefore seems that both DNA structure and hydrogen bonding to guanine contribute towards sequence recognition.

104. But other forms eventually arose which were able to extract hydrogen from a very much more widespread source - water.

105. The high abundances of hydrogen and helium are features of the giant planets also.

106. Methane condenses to form a cloud layer above the ammonia clouds, leaving a gas that is almost entirely hydrogen and helium.

107. These studies confidently predict that at any plausible temperatures in Jupiter no solid molecular hydrogen surface is encountered.

108. But low hydrogen yields and poisoned catalysts soon had these systems grinding to a halt.

109. And the recently discovered structure of atoms gave them the idea that they could make helium out of hydrogen.

110. Glutamic acid 170 forms the final main-chain hydrogen bond in the molecule.

111. This incredibly dense, hot soup of protons and electrons is called fluid metallic hydrogen.

112. The principal body electrolytes are sodium, potassium and hydrogen ions.

113. In terms of stopping power per gram, the ideal material for stopping cosmic-ray protons is hydrogen.

114. Bennett and Williams suggest that the cells of opening or closing traps acidify their own walls by releasing hydrogen ions.

115. When hydrogen and oxygen are combined in a fuel cell, an electrochemical reaction generates an electric current.

116. The water vapor can then be cycled by reacting it with carbon monoxide to make carbon dioxide and hydrogen.

117. Fresh hydrogen gas is charged to the inlet of the reactor to balance consumption.

118. These bacteria use molecular hydrogen as well as other electron donors, for the dissimilatory reduction of sulphate to sulphide.

119. Polarised hydrogen, on the other hand. which may be easier to make than polarised xenon, could help fusion research.

120. Protein residues in contact are also shown, with hydrogen bonds as dotted lines.