Книги. Художественная литература. Учебники и пособия.

High Quality Content by WIKIPEDIA articles! The prokaryotes are a group of organisms that lack a cell nucleus (= karyon), or any other membrane-bound organelles. They differ from the eukaryotes, which have a cell nucleus. Most are unicellular, but a few prokaryotes such as myxobacteria have multicellular stages in their life cycles. The word prokaryote comes from the Greek ???- (pro-) "before" + ?????? (karyon) "nut or kernel", referring to the cell nucleus, + suffix -???? (-?t?s) (pl. -???? (-?tes)). It is also spelled "procaryote".

High Quality Content by WIKIPEDIA articles! Shark finning refers to the removal and retention of shark fins and the discard at sea of the carcass. The shark is most often still alive when it is tossed back into the water. The finless sharks are unable to swim and sink to the ocean bottom and die. Shark finning takes place at sea so the fishers only have to transport the fins. Shark meat is considered low value and therefore not worth the cost of transporting the bulky shark bodies to market. Longlines, used in shark finning operations, are the most significant cause of losses in shark populations worldwide. Shark finning is widespread, and largely unmanaged and unmonitored. Shark finning has increased over the past decade due to the increasing demand for shark fins such as for Chinese shark fin soup and traditional cures, improved fishing technology, and improved market economics.

High Quality Content by WIKIPEDIA articles! Structural biology is a branch of molecular biology, biochemistry, and biophysics concerned with the molecular structure of biological macromolecules, especially proteins and nucleic acids, how they acquire the structures they have, and how alterations in their structures affect their function. This subject is of great interest to biologists because macromolecules carry out most of the functions of cells, and because it is only by coiling into specific three-dimensional shapes that they are able to perform these functions. This architecture, the "tertiary structure" of molecules, depends in a complicated way on the molecules' basic composition, or "primary structures." Structural biology is that branch of life science,which deals with the study of molecular strucuture of biological macromolecules like proteins and nucleic acids.

Frank Indiviglio

These unusual looking marine fish need a steady diet of plankton to stay healthy and active. Here is a wealth of advice and information for aquarium hobbyists on keeping seahorses of different varieties. Barron's comprehensive Pet Owner's Manuals are heavily illustrated and filled with useful information. They instruct owners on how to care for their dogs, cats, birds, fish, and other animals. Books give advice on purchasing and acquiring, health care, feeding, and much more. Clear, straightforward texts are accompanied by high-quality full-color photos and anatomically accurate line art, as well as helpful tables and charts.

Steve Potter

Student Unit Guides are perfect for revision. Each guide is written by an examiner and explains the unit requirements, summarises the relevant unit content and includes a series of specimen questions and answers. There are three sections to each guide: Introduction -- includes advice on how to use the guide, an explanation of the skills being tested by the assessment objectives, an outline of the unit or module and, depending on the unit, suggestions for how to revise effectively and prepare for the examination questions. Content Guidance -- provides an examiner's overview of the module's key terms and concepts and identifies opportunities to exhibit the skills required by the unit. It is designed to help students to structure their revision and make them aware of the concepts they need to understand the exam and how they might analyse and evaluate topics. Question and Answers -- sample questions and with graded answers which have been carefully written to reflect the style of the...

SAM PATRICK OGWANG, Anne Christine, Anders Ferno

Zebrafish has become a model organism for the study of developmental biology and genetics. Less is, however, known about the behaviour of this cyprinid fish. A zebrafish is exposed to many unfamiliar objects during its lifetime, and the response to these stimuli is critical for an adaptive behaviour. This book presents a master thesis from the University of Bergen in Norway on the behaviour of zebrafish of different origin and background towards a novel object and how the alarm pheromone released by this species upon predator attack modifies the response. In this study we found that laboratory fish inspected the novel object earlier, whereas the presence of a novel object and also alarm substance increased shoaling more in the wild strain. Overall,laboratory zebrafish were bolder than fish from the wild strain. This book provides valuable knowledge on how genetics and experience interact to shape the behaviour towards a potential threat in different strains of zebrafish. It is...

Paul E. Kolenbrander

Goes beyond the reporting of genome sequencing information to explore the use of genome sequences to formulate and answer questions related to interspecies interactions among human oral microbes. Focuses on how knowledge of a genome sequence can be applied to answer a research question and emphasizes mixed-species community life and oral microbial biofilms

Stanton Davis Kirkham

This is an OCR edition without illustrations or index. It may have numerous typos or missing text. However, purchasers can download a free scanned copy of the original rare book from GeneralBooksClub.com. You can also preview excerpts from the book there. Purchasers are also entitled to a free trial membership in the General Books Club where they can select from more than a million books without charge. Original Published by: P. Elder & Company in 1908 in 264 pages; Subjects: Natural history; History / General; Nature / General; Nature / Essays; Nature / Reference; Photography / History; Photography / Subjects & Themes / Plants & Animals; Science / Life Sciences / Biology / General;

High Quality Content by WIKIPEDIA articles! Protein targeting or protein sorting is the mechanism by which a cell transports proteins to the appropriate positions in the cell or outside of it. Sorting targets can be the inner space of an organelle, any of several interior membranes, the cell's outer membrane, or its exterior via secretion. This delivery process is carried out based on information contained in the protein itself. Correct sorting is crucial for the cell; errors can lead to diseases.

Chris Stringer, Peter Andrews

Human domination of the earth is now so complete that it is easy to forget how recently our role in the history of the planet began: the earliest apes evolved around twenty million years ago, yet Homo sapiens has existed for a mere 150,000 years. In the intervening period, many species of early ape and human have lived and died out, leaving behind the fossilized remains that have helped to make the detailed picture of our evolution revealed here. This exciting, up-to-the-minute account is divided into three accessible sections. "In Search of Our Ancestors" examines the contexts in which fossilized remains have been found and the techniques used to study them. "The Fossil Evidence" traces in detail the evolution of apes and humans, from Proconsul to the australopithecines, and Homo erectus to the Neanderthals and Homo sapiens. The latest fossil finds at major new sites such as Dmanisi in Georgia and Gran Dolina in Spain are appraised, and new advances in genetic studies,...