At the opposite extreme, if one looks at the microscopic situation, one sees there are many ways of carrying an electric current, including: a flow of electrons ; a flow of electron " holes " that act like positive particles ; and both negative and positive particles ( ions or other charged particles ) flowing in opposite directions in an electrolytic solution or a plasma ).

At the very least, they cause internal work hardening and other microscopic imperfections.

At the microscopic level, there are three primary features of the thyroid:

At the microscopic level, each part of the cortex consists of the same small set of neuronal elements, laid out with a highly stereotyped geometry.

At a microscopic level, developed black-and-white photographic film also consists of only two colors, and not an infinite range of continuous tones.

At the microscopic level, male copepods can follow a three-dimensional pheromone trail left by a swimming female,

At its most microscopic level, the subject comes solely from the ascending major second from the first two beats in the top voice of Handel's theme.

At the national and international level, then, what is the highest kind of morality for the private citizen represents an instance of political immorality.

At the central level the scrutin uninominal voting system was selected over some form of the scrutin de liste system, even though the latter had been recommended by Duverger and favored by all political parties.

At the policy level, common goals of agriculture include:

At this level we do not need to mention how the machine manages its tape or head.

At this level we do not give details of states or transition function.

At the molecular level, an antigen can sometimes be characterized by its ability to be " bound " at the antigen-binding site of an antibody.

At a schematic level, that basic worm-shape continues to be reflected in the body and nervous system architecture of all modern bilaterians, including vertebrates.

At high levels of play, the backhand serve has become popular to the extent that forehand serves have become fairly rare at a high level of play.

At the start of 2007, the BWF introduced a new tournament structure for the highest level tournaments aside from those in level one: the BWF Super Series.

At the time of his retirement from the England team in 1970, he was the nation's most capped player, having turned out 106 times at the highest level.

At the broadest level Micah can be divided into three roughly equal parts:

At this level students could start to move on their own.

At the lowest level, executable code consists of machine language instructions specific to an individual processor.

At the level of the individual, pressing psychological needs may influence the process, and certain of our universal mental tools may impose epistemic ' blind spots '.

At the group or sociological level, historic factors may make the process of assigning satisfactory meanings more or less problematic.

At the Master's level and higher, students tend to specialize in a particular field.

At a deeper level, there are still basic conceptual issues that remain unresolved.

At the most basic level, this involves establishing what form of currency the country may have, whether a fiat currency, gold-backed currency ( disallowed for countries with membership of the International Monetary Fund ), currency board or a currency union.

At the federal level, it forms a common ' CDU / CSU ' faction in the Bundestag with the CDU, which is frequently referred to as the Union Faction ( die Unionsfraktion ).

At, the Channel Tunnel possesses the longest undersea portion of any tunnel in the world, although the Seikan Tunnel in Japan is both longer overall at and deeper at below sea level.

At the simplest level, the process of composting simply requires making a heap of wetted organic matter ( leaves, " green " food waste ) and waiting for the materials to break down into humus after a period of weeks or months.

At the end of glacials with sea level rapidly rising, corals become major sinks for Carbon dioxide as the reefs grow up to the new sea level.

At the circuit level, there are various techniques that can be used to measure current:

`` At 200, 300, 400 feet under the water, when he must be paying very much attention, he will be thinking about what you are telling him.

At least a dozen men, some armed, are never far away from him.

At any rate, three men out of a six-man B-52 crew are required to copy down Wisman's go-to-war message.

At either end and in the center there are bays which contain nine greater alcoves as frescoed and capacious as church apses.

At what stage are social sciences then??

At least I should like them to know that I know these discounts are being made.

At Khrushchev's door, therefore, can be placed the primary blame but also at fault are those who permitted themselves to be intimidated.

At times, three ships a day from the Soviet bloc are unloading in Cuban ports.

At this point it should be painfully obvious that cities, being `` soft '', and the people within them are ideally suited to destruction by nuclear weapons.

At Cypress Gardens special bleachers are set up for photographers at water-ski shows and lovely models pose for pictures in garden settings.

At the moment, many of these are being pulled down.

At present, both the familiar cast acrylic and the newer extruded sheets are being used by sign manufacturers, with extruded now representing an estimated 10% of the total.

At some cities, this pick-up and delivery service is without additional charge, and, if you are budget-wise, when you are planning your itinerary, you will take advantage of these free delivery and collection stations in major cities within the larger European countries.

At one astronomical unit from the sun ( the Earth's distance ) the dust orbits are probably nearly circular.

At the present time we do not know by what biochemical mechanism TSH acts on the thyroid, but for bio-assay of the hormone there are a number of properties by which its activity may be estimated, including release of iodine from the thyroid, increase in thyroid weight, increase in mean height of the follicular cells and increase in the thyroidal uptake of Af.

At a third stage in the modernization process are such countries as India, Brazil, the Philippines, and Taiwan, which are ready and committed to move into the stage of self-sustaining growth.

At this time, however, there are signs that increased availability of mortgage credit will not act with the usual speed to stimulate a sharp rise in residential construction.

At the end of this pass, the table indicates which index words and electronic switches are not available for assignment to symbolic references.

At the conclusion of the washing, 8 liters of water at 90-degrees-F ( 32*0C. ) are automatically metered from the rinse reservoir to the washing tubs, 4 liters to each tub.

At this point the drains are readjusted so that the suds box drain will discharge directly into the waste line and the main tub drain is set at the 2-1/2 mark on the drain gauge.

At the beginning of the school year, the new students don't eat the cereal right away, but within a short time they are eating it voraciously.

At its most ecstatic moments, husband and wife are elevated far above worldly cares.

At the same time, there is a good deal of self-congratulation at attending a good college -- they are even inclined to exaggerate its not inconsiderable virtues -- and they express pleasure at the cozy in-group feeling that the college generates.