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Paperback. Zustand: Very Good. No Dust Jacket. Ex-college library paperback. Pages and cover in very clean condition with only slight signs of wear, and some minimal library marking. Used.

Zustand: New. In English.

Hardcover, blue glossy boards. Owner's inscription to verso of half-title, otherwise very good, 8vo. xiv, 564 pp.

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Zustand: Very Good. Former library copy. Pages intact with possible writing/highlighting. Binding strong with minor wear. Dust jackets/supplements may not be included. Includes library markings. Stock photo provided. Product includes identifying sticker. Better World Books: Buy Books. Do Good.

Newly obtained and previously published sequences of the cytochrome c oxidase subunit I (COI) gene were analyzed to examine the biogeographic assembly of the caenogastropod fauna (belonging to the families Assimineidae, Cochliopidae, and Hydrobiidae) of an isolated spring along the lower Colorado River in southern Nevada (Blue Point Spring). Based on available COI clock calibrations, the three lineages that comprise this fauna are 2.78?1.42 million years old, which is roughly coeval or slightly younger than the age of Blue Point Spring (inferred from local fossil spring deposits). Two of the lineages?endemic Pyrgulopsis coloradensis and Assiminea aff. infima?are most closely related to snails in the Death Valley area (well to the west) and likely colonized Blue Point Spring by transport on birds. A single haplotype was detected in both of these snails, suggesting that they may have only recently colonized Blue Point Spring. The third lineage?endemic Tryonia infernalis, newly described herein based on morphological and molecular evidence?is most closely related to a geographically proximal species in a lower Colorado River tributary (T. clathrata); the split between these taxa may be the product of vicariance (severance of a prior drainage connection) or a separate jump dispersal event. The considerable genetic diversity in T. infernalis (three haplotypes differing by 0.6% mean sequence divergence) suggests a possibly lengthy history of local differentiation. Our findings also identify Blue Point Spring as a new micro-hotspot of groundwater-dependent biodiversity in Nevada and will assist ongoing efforts to protect and conserve these imperiled ecosystems. 16 pp., 6 figs, 2 tabs, gr. 8.…

Undescribed freshwater snails (Amnicolidae: Colligyrus) from the Mount Hood region (northwestern United States) identified as a new species (commonly known as the Columbia duskysnail) in grey literature have been provided federal protection under the ?survey and manage? provisions of the Northwest Forest Plan and have been placed on conservation watch lists. However, there are no published studies of the identity of these snails aside from a molecular phylogenetic analysis which delineated a close relationship between the single sampled population and C. greggi, which is distributed more than 750 km to the east of the Mount Hood area. Here we examine the taxonomic status of the Columbia duskysnail based on additional molecular sampling of mitochondrial DNA sequences (COI) and morphological evidence. We found that the Columbia duskysnail is not a monophyletic group and forms a strongly supported clade with C. greggi. The COI divergence between these broadly disjunct groups (2.1%) was somewhat larger than that within C. greggi (1.0%) but considerably less than that among the three currently recognized species of Colligyrus (8.7?12.1%). Additionally we found that the Columbia duskysnail and C. greggi cannot be consistently differentiated by previously reported diagnostic characters (size and shape of shell spire, pigmentation of body and penis) and are closely similar in other aspects of morphology. Based on these results we conclude that the Columbia duskysnail is conspecific with C. greggi. 13 pp., 6 figs, 4 tabs, gr. 8.…

Zustand: New. In English.

We describe two new species of pebblesnails (Lithoglyphidae: Fluminicola) from southwest Oregon based on morphologic and mitochondrial DNA (COI, cytB) evidence. Fluminicola umpquaensis sp. n., which had been traditionally identified as F. virens prior to the recent restriction of the latter to the lower Columbia River drainage, lives in lotic habitats in the Umpqua River basin. This species is readily distinguished from closely related F. gustafsoni and F. virens by shell and anatomical characters, and by its mtDNA sequences (divergence >3.6% for both genes). Fluminicola fresti sp. n. ranges among lotic habitats in the North Umpqua River basin, and in the upper Rogue River drainage north of Little Butte Creek. This species differs from other congeners by >9.1% for both genes and is distinguished from closely similar and geographically proximal F. multifarius by several anatomical characters. Additionally, new records are provided for F. multifarius from the upper Rogue River basin south of Little Butte Creek, which extend the geographic range of this species about 80 km northward from the Sacramento River headwater region. This continues a recent series of taxonomic papers on the poorly known and little studied pebblesnail fauna of the vast Pacific watershed from northern California to southern British Columbia. New taxa: Fluminicola umpquaensis n. sp., Fluminicola fresti n. sp. 20 pp., 6 figs, gr. 8.…

Zustand: NEW.

Zustand: New. Xia, Jian-Bai Liu, Duan-Yang Sheng, Wei-DongMoore s Law predicts that the degree of microprocessor integration of circuits would double every 18 months in DRAM. Although the scaling of microelectronic circuit elements still follows Moore s Law, the un.

Paperback. Zustand: Brand New. illustrated edition. 564 pages. 8.40x6.10x1.00 inches. In Stock.

Zustand: New. In English.

Hardcover. Zustand: Brand New. 1st edition. 237 pages. 9.25x6.25x0.75 inches. In Stock.

Hardcover. Zustand: Brand New. 294 pages. 9.25x6.10x0.83 inches. In Stock.

Zustand: New. pp. 248.

Paperback. Zustand: Brand New. 1st edition. 248 pages. 10.00x7.00x1.00 inches. In Stock.

Buch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - This three volume set presents papers from the first collaborative global metallurgy conference focused exclusively on extractive topics, including business and economic issues. Contributions examine new developments in foundational extractive metallurgy topics and techniques, and present the latest research and insights on emerging technologies and issues that are shaping the global extractive metallurgy industry. The book is organized around the following main themes: hydrometallurgy, pyrometallurgy, sulfide flotation, and extractive metallurgy markets and economics.…

Soft cover. Zustand: Very Good. xii+831 pp., illustrations, bibliography, index. light cover wear, small tear at top & bottom of spine. Contents: The necessity of scientific education in China to-day; The peoples of Kwangtung: Their origin, migrations, and present distribution; The manufacture of leather in Canton; On the palm and sole prints of Chinese; Manufactures weather; The study of botany in Fukien; A note on Gnetum scandens; The Magnoliaceae of Kwangtung, Macao, and Hong Kong; The botany of Kwangtung and its relation to agriculture; Differentiating fungi by precipitation with water-soluble specific substances; The number of vascular bundles in Ephedra sinica and E. equisetina; Grasses of Canton vicinity; A brief historical survey of the Lingnan University Herbarium; The local resident's opportunity for productive work in the biological sciences in China; Unrecorded plants from Kwangtung Province II; A review of the literature on the growth of Bamboo; Remarks on citrus and citrus relatives in China; The marine and freshwater algae of China; The collection of mosquitoes in south China; On two species of Sphaeridium from the oriental region (Coleoptera, Hydrophilidae); Gall midges or gall gnats of the orient (Itonididae or Cecidomyiidae); The membracidae of China; A common moth and some of its enemies; The Brethnidae and Lycidae of China; Our present knowledge about the Pupipara of Tabanidae of China; A new species of stonefly from China (order Plecoptera, family Nemouridae); Biological notes on a Chrysomelid pest of bamboo; Termites, destroyers of wood and man's fight against them; Present status of our knowledge of the termites of China; Insect inhabitants of the fruiting sprays of the pagoda tree, Sophora japonica; Studies on the Chinese honey-bee; Some principles useful in solving economic biological problems; Study of Brachyplatus subaëneus Westw.; The nervous system of the white grub (the larva of Osmoderma socialis Horn) Part I. External characters of the nervous system; The nervous system of the white grub (the larva of Osmoderma socialis Horn) part II. Internal structure of the brain and ventral nerve cord; External morphology of the corn ear worm; The present status of knowledge bout Chinese Gryinidae; On the cricket locusts (Gryllacrids) of China; A list of the coprophagous Coleoptera of China; Notes on the life history of a wild silkworm; History of Rhynchocoris humeralis Thumb. (Hemiptera, Pentatomidae).…