The Earth’s polar regions (see Figure 1.1) are ecologically, economically,
and, increasingly, geopolitically important; they are particularly
vulnerable to the speed and magnitude of climate change and
have significant potential to influence the global climate system (Oreskes,
2004; IPCC, 2007a; Anderegg et al., 2010). Climate models and observational
data have shown that polar regions have warmed at substantially
higher rates than the global mean (IPCC, 2007c).
From the early explorers onwards, visitors to the
Arctic and to Antarctica have commented with
great interest on the presence of lakes, wetlands, and
fl owing waters. These environments encompass a
spectacular range of conditions for aquatic life, from
dilute surface melt ponds, to deep, highly stratifi ed,
Organic techniques have been researched up one side and down the other
without results. The reason is that the name of the game is feeding
microorganisms. It should surprise no one (but surprises everyone) to find that
the best food for growing microorganisms consists of those things readily
available all over the earth.
Although the term "Waste Places" carries an implied meaning of "worthless," yet, interpreted in the light of
Nature's methods, each region described, useless as it may apparently seem, possesses a definite relation to the
rest of the world, and therefore to the well-being of man. The Sahara is the track of the winds whose moisture
fertilizes the flood-plains of the Nile. The Himalaya Mountains condense the rain that gives life to India. From
the inhospitable polar regions come the winds and currents that temper the heat of the tropics....
Encouraged by the friendly acceptance of the first edition and stimulated by
numerous requests and comments from the community of meiobenthologists,
this second edition updates my monograph on meiobenthology. The revised text
emphasizes new discoveries and developments of relevance; it has been
extended by adding chapters on meiofauna in areas not covered before, such as
the polar regions, mangroves, and hydrothermal vents.
Ebook Life science: Predator and Prey includes about why are predators at the mercy of their prey? What need do all desert animals have in common? What adaptations are common to many animals in polar regions? Sea creatures have different adaptations for survival in the oceans.
This is the first of two reports that address the complex issue of incorporating the needs of climate research
into the National Polar-orbiting Operational Environmental Satellite System (NPOESS). NPOESS, which has
been driven by the imperative of reliably providing short-term weather information, is itself a union of heretofore
separate civilian and military programs. It is a marriage of convenience to eliminate needless duplication and
reduce cost, one that appears to be working.
"A time will come in later years when the Ocean will unloose the bands of things, when the immeasurable
earth will lie open, when seafarers will discover new countries, and Thule will no longer be the extreme point
among the lands."--Seneca.
Unseen and untrodden under their spotless mantle of ice the rigid polar regions slept the profound sleep of
death from the earliest dawn of time. Wrapped in his white shroud, the mighty giant stretched his clammy
ice-limbs abroad, and dreamed his age-long dreams.
Ages passed--deep was the silence....
Over a million different kinds of insects have so far been described and named,
and many more certainly remain t o be d i s c o v e r e d . T h i s i s more t h a n a l l t h e other
known animal species put together. They occupy almost every known habitat
outside the polar regions and the deep sea. They are represented by immense
populations - perhaps 10 m i l l i o n i n d i v i d u a l s i n a s i n g...
Plants inhabiting high alpine and nival zones are considered as living in an extreme
Extreme environments have been attractive for explorers for centuries, and nowadays
they also attract tourists. Fortunately biological science is becoming increasingly
aware that these remote habitats provide challenging questions that will help to
understand the limits of life functions.
We now need to move into the Calculus II applications of integrals and how we do them in terms of polar coordinates. In this section we’ll look at the arc length of the curve given by, where we also assume that the curve is traced out exactly once. Just as we did with the tangent lines in polar coordinates we’ll first write the curve in terms of a set of parametric equations.
In the late twentieth century international trade moved from a political multi-polar system based on the nation-state to a system featuring unified regional trading regimes. An inevitable feature of increased cooperation through bilateral, regional and international arrangements is the emergence of disputes over the interpretation and implementation of the agreed upon commitments. Accordingly, reliable mechanisms for the settlement of trade related disputes have become necessary to ensure the effective and continued functioning of these arrangements.
This ancient Native American proverb and what it implies resonates
today as it has become increasingly obvious that people’s actions
and interactions with the environment affect not only living conditions
now, but also those of many generations to follow. Humans must
address the effect they have on the Earth’s climate and how their choices
today will have an impact on future generations.
Chương 1: Tích phân bội (Multiple Integrals) cung cấp cho các bạn những kiến thức về tích phân kép trên hình chữ nhật (double integrals over rectangles); tích phân lặp (iterated integrals); tích phân kép trên miền tổng quát (double integrals over general regions);tích phân kép trong tọa độ cực (double integrals in polar coordinates).
Tip growth is a specialized type of polar growth where new
cell wall is deposited in a localized region of the cell, the
growing tip. These cells show a characteristic zonation, with
a high accumulationof secretory vesicles containing cell wall
components at the tip, followed by an organelle-enriched
zone.MsPG3is a Medicago sativapolygalacturonase gene
isolated in our laboratory, specifically expressed during the
interaction of this plant with its symbiotic partner Sinorhiz-obium melilotiand which might participate in tip growth
processes during symbiosis....