However it is now thought this was probably a deliberate change in composition and overall the use of brass increases over this period making up around 40 % of all copper alloys used in the Roman world by the 4th century AD.

However, as of September 2006, the PPM stands at 87. 5 % after a period of steady increases in the annual moving average since 2003.

However, while increases in crop yield are the most obvious applications of modern biotechnology in agriculture, it is also the most difficult one.

However, they are much less toxic than their predecessors, the barbiturates, and death rarely results when a benzodiazepine is the only drug taken ; however, when combined with other central nervous system depressants such as alcohol and opiates, the potential for toxicity and fatal overdose increases.

However, as it gains in volume from the very numerous tributary streams, large and small, that it receives en route, its velocity increases, and in the wet season reaches, even in certain stretches.

However, after enough carbamazepine has been presented to the liver tissue, the CYP3A4 activity increases, speeding up drug clearance and shortening the half-life.

However, public opposition to increases in defence spending — during a period when economic constraints require reduced spending for social welfare — has created differences among the political parties regarding a broadly acceptable level of new defence expenditure.

However, this is a relatively small number especially when playing with more than four people, so many domino sets are " extended " by introducing ends with greater numbers of spots, which increases the number of unique combinations of ends and thus of pieces.

However, France has a number of MVNOs which increases competition.

However, under some conditions, e. g. less fertile soils or less predictable drought regimes, the proportion of evergreen species increases and the forests are characterised as " sclerophyllous ".

However, creating more data to input to machine-learning systems simply requires a corresponding increase in the number of man-hours worked, generally without significant increases in the complexity of the annotation process.

However due to a slight increase in internal leakage as the pressure increases, a truly constant flow rate cannot be achieved.

However there is no documented evidence that the policy of requiring periodic changes in passwords increases system security.

However, high levels of oxidative damage increases the degree of cross-linking between protein fragments, rendering the aggregates resistant to proteolysis.

However, depletion of HAUSP does not result to a decrease in p53 levels but rather increases p53 levels due to the fact that HAUSP binds and deubiquitinates Mdm2.

However, as the size of the boat increases, the benefits of mainsail roller furling increase dramatically.

However, if two condoms are used simultaneously ( male condom on top of male condom, or male condom inside female condom ), this increases the chance of condom failure.

However, ASR in the field of document production has not seen the expected increases in use.

However, as we have seen, reducing a tachyon's energy increases its speed, so that the single hyperbola formed is of two oppositely charged tachyons with opposite momenta ( same magnitude, opposite sign ) which annihilate each other when they simultaneously reach infinite speed at the same place in space.

However, ion thrusters carry a fundamental price: the power imparted to the exhaust increases with the square of its velocity while the thrust increases only linearly.

However, as distance increases, rules and protocols need to be implemented.

However this amplifies noise ,< ref name =" Christy1998 "> increases inter-satellite calibration biases and enhances surface contamination.

However, this increases complexity and the likelihood of priority inversion, as well as suboptimal scheduling without extensive ( and expensive ) coordination between the userland scheduler and the kernel scheduler.

However widespread agricultural use led to resistant insect populations.

However, new trade policies have made agricultural production much more responsive to market demands, putting global food reserves at their lowest since 1983.

However, by the time of the Uruguay round, many countries considered the exception of agriculture to be sufficiently glaring that they refused to sign a new deal without some movement on agricultural products.

However, Scotland in 1750 was still a poor rural, agricultural society with a population of 1. 3 million.

However, Stevenson and Wassersug observe that for sustained activity, a work rate of about 1 hp per horse is consistent with agricultural advice from both 19th and 20th century sources.

However, marionette productions presented in empty halls, the back rooms of taverns, or within large tents at England's yearly agricultural events at Bartholomew Fair and Mayfair were expensive and cumbersome to mount and transport.

However, when Puerto Rico changed its mostly agricultural economy to an industrialized one, and the U. S. and Puerto Rican governments started investing heavily in interstate highways and freeways, the railroad business soon collapsed.

However, in normal agricultural practice, it is rare to use only a single pesticide.

However, poor climatic conditions and severe drought badly affected the agricultural sector, thus reducing its share in the economy to about 17 % of 2008 GDP, down from 20. 4 % in 2007, according to preliminary data from the Central Bureau of Statistics.

However, the mineral sector has yet to start contributing significantly to the overall Tanzanian economy, and industry is still mainly limited to processing agricultural products and light consumer goods.

However, livestock products, including meat, milk, wool, and eggs, contributed to more than ⅓ of the value of agricultural output.

However, most agricultural land is of poor quality and requires irrigation.

However, the working conditions of agricultural workers as a whole, particularly non-permanent workers, remain poor and well below conditions prevailing in other economic sectors.

However, the Venetian empire was a major exporter of agricultural products and, until the mid-18th century, a significant manufacturing center.

However, importation of areca nut in a form other than whole or carved kernels of nuts can be stopped at the discretion of US Customs officers on the grounds of food, agricultural, or medicinal drug violations.

However, there are indications that regional food production has peaked in many world sectors, due to certain strategies associated with intensive agriculture such as groundwater overdrafting and overuse of pesticides and other agricultural chemicals.

However, FAD could not explain why only a certain section of the population such as the agricultural laborer was affected by famines while others were insulated from famines.

However, he was one of the first to denounce damages from the Green Revolution (" Révolution Verte ") and to fight agricultural productivism.

However, it is not clear to what extent this was due to an influx of Han settlers, who were predominantly displaced young men from Zhangzhou and Quanzhou in Fujian province or from a variety of other factors, including: frequent intermarriage between Han and aborigines, the replacement of aboriginal marriage and abortion taboos, and the widespread adoption of the Han agricultural lifestyle due to the depletion of traditional game stocks, which may have led to increased birth rates and population growth.

However, the agricultural sector remains heavily subsidized and protected ; some tariffs range as high as 700 %.

However, the key shift involved the status of agricultural surpluses.

However, most of the criticism of the agreement has focused on its potential impact on Peru's agricultural sector.

However, Hidalgo County began to shift away from its traditional agricultural focus as international trade, manufacturing, health care and retails sales became the dominant sectors.

However, with the reductions in timber harvesting, and the continued pressure of population growth on many agricultural areas, these have become less important in the economic development of the county.