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  • 1
    Publication Date: 1992-01-01
    Print ISSN: 0883-6353
    Electronic ISSN: 1520-6548
    Topics: Archaeology , Geosciences
    Published by Wiley
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  • 2
    Publication Date: 2014-07-01
    Print ISSN: 0031-0182
    Electronic ISSN: 1872-616X
    Topics: Geosciences , Physics
    Published by Elsevier
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  • 3
    ISSN: 1432-0878
    Keywords: Granules ; Myeloperoxidase ; Polymorphonuclear leukocytes ; Macrophages ; Phagocytosis ; Mouse (C57BL/6)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Functional myeloperoxidase contained in granules of polymorphonuclear neutrophil leukocytes or in fixed whole cells can be endocytosed by mouse peritoneal macrophages. Acquired myeloperoxidase was distributed in what we considered to be the secondary lysosomal system and, following a phagocytic stimulation, was delivered to newly formed phagosomes containing the targets.
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  • 4
    ISSN: 1573-4927
    Keywords: isozyme analyses ; agarose gel electrophoresis ; chromosome 1 ; chromosome 2 ; somatic cell hybrids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Isozyme analysis of rodent-human somatic cell hybrids has been used frequently to detect specific human chromosomes. The majority of these isozyme systems employs starch gels, the use of which can be laborious when screening large numbers of cell lines. We describe the development of two procedures to detect the long arms of human chromosomes 1 and 2 in Chinese hamster-human cell hybrids by a rapid and reproducible method using 1-mm-thick agarose gels. Detection of human chromosome 1q was accomplished by screening for human fumarate hydratase activity, whose gene has been mapped to 1q42.1. Detection of chromosome 2q was performed by screening for the isozyme isocitrate dehydrogenase 1, which has been localized to 2q32-qter. These systems provide a basis for the further development of procedures for detecting chromosome-specific isozyme markers in agarose gels.
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  • 5
    ISSN: 1435-8107
    Keywords: Key Words. 1-aminocyclopropane-1-carboxylic acid (ACC)—Capsicum annuum—Indole-3-acetic acid (1AA)—1-naphthaleneacetic acid (NAA)—Paprika
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. High temperatures induced abscission of pepper (Capsicum annuum L. cv. Maor) reproductive organs at various developmental stages. The role of ethylene biosynthesis and auxin economy in high temperature-induced abscission is described. High temperatures somewhat increased ethylene production in the reproductive organs, but the highest temperature treatment, which was the most active in inducing reproductive organ abscission, decreased it. In contrast to ethylene, 1-aminocyclopropane-1-carboxylic acid levels increased significantly in response to high temperatures and correlated positively with the increase in temperature. High temperatures reduced indole-3-acetic acid levels and particularly auxin transport capacity in the reproductive organs. The data suggest that the reduction of auxin transport capacity is the major mechanism by which high temperatures induce reproductive organ abscission in pepper.
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  • 6
    ISSN: 1573-5087
    Keywords: ethylene antagonist ; ethylene receptor ; 1-MCP ; 3-MCP, binding ; 1-methylcyclopropene ; 3-methylcyclopropene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract 3-Methylcyclopropene (3-MCP) binds to the ethylene receptor and blocks it for several days, but concentrationswise is less effective than 1-methylcyclopropene (1-MCP). In diverse ethylene-responsive systems, including ripening of mature-green bananas (Musa sapientum L.), inhibition of growth in etiolated pea (Pisum sativum L.) seedlings, abscission of orange (Citrus sinensis L.) leaf explants and mung bean (Vigna radiata L.) leaves, and wilting of campanula (Campanula carpatica) and kalanchoe (Kalanchoë blossfeldiana) florets, full inhibition of the ethylene response required higher concentrations of 3-MCP. Depending on the experimental system, the effective concentration of 3-MCP was from 5 to 10 times higher than that required for 1-MCP.
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  • 7
    ISSN: 1573-5087
    Keywords: Phaseolus ; Citrus ; Ligustrum plants ; Ethylene binding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A number of plants were tested for their ability to bind ethylene and the number of binding sites present in each was calculated. Primary leaves of laboratory-grown beans (Phaseolus vulgaris) bound 140 dpm/g fwt (1794 dpm/g dry wt) when exposed to 1.0 μCi/1 of [14C]ethylene (110 ci/mol). Phytotron-grown leaves were less succulent but only bound 90 dpm/g fwt (1046 dpm/g dry wt). Bean roots bound 30 dpm/g fwt. Citrus and Ligustrum bound 207 and 240 dpm/g fwt, respectively. The time required to achieve equilibrium of leaves with the gas phase was 15 min for bean, 30 min for Citrus, and 30–60 min for Ligustrum. The time for 1/2 of the bound ethylene to diffuse out of the leaves was 20 min for bean, 10 min for Citrus, and 30 min for Ligustrum. The amount of ethylene needed to occupy 1/2 of the binding sites was obtained from Scatchard plots. This value (Kd) was 0.2 μl/1 for bean, 0.15 for Citrus, and 0.31 for Ligustrum. The quantity of binding sites in the tissues was 2.0×10-9 mol of binding sites/kg tissue for bean leaves, 5.7×10-9 for Citrus leaves, and 6.8×10-9 for Ligustrum. Pretreatment with indoleacetic acid (IAA), ehtylene, and cycloheximide (1 mg/1) had little effect on the level of ethylene-binding sites in Citrus.
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  • 8
    ISSN: 1573-5117
    Keywords: Parapenaeus ; Penaeidae life cycle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The population ofP. longirostris along the Mediterranean coast of Israel spends the benthic phase of its life cycle (from body size over 15 mm) on muddy bottom deeper than 45 m. New age groups are recruited within the depth zone of 45–300 m and migrate in both inshore and offshore directions. Inshore migration is limited by unsuitable sandy ground. The limiting line for offshore migration was not found. An age group could be detected during one year within a body size range of TL = 40 mm to TL = 84.5 mm for males and to TL = 102.5 mm for females. Reproductive activity in shallow water, down to a depth of 73 m, takes place during the whole year, while in depths of 150–300 m there is an arrest of reproductive activity from June to August.
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  • 9
    ISSN: 1573-5117
    Keywords: histology ; gonads ; ecology ; Jordan River
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The reproductive biology and gonad cycle of three Cyprinid fish species:Barbus canis (Valenciennes, 1842),B. longiceps (Valenciennes, 1842) andCapoeta damascina (Valenciennes, 1842), in the upper Jordan River system of Israel were studied by monthly sampling over a two-year period. The reproductive activity of the three species was found to peak from January to April, mostly involving upstream migration towards spawning grounds on river beds 400–900 m above the Jordan River. Hybrids of the three species were collected in nature: in those ofBarbus canis ×Capoeta damascina, the gonads possessed both types of gametes, spermatogonia and oogonia, all of which became arrested at an early stage of development, and infertile; in hybrids of detected in nature, males had oocytes dispersed in the testis, whereas in females, the ovaries had small islets of spermatogonial tissue. In these female hybrids the oocytes ripened normally and spawning occurred.
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  • 10
    ISSN: 1573-5117
    Keywords: Aphanius dispar ; environmental factors ; gonado-somatic index ; ovary scores
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In order to determine the suitability of thecyprinodont fish Aphanius dispar as a biologicalcontrol agent for mosquito larvae, the effects oftemperature, salinity, feeding rate and photoperiod onits reproductive condition were studied. The factorsexamined were the gonado-somatic index (GSI) and fourdistinct stages of cell maturation in the ovaries(oogonia, primary oocytes, secondary oocytes andmature ova). The fish were found to be tolerant to awide range of the examined factors. GSI's were notaffected by ambient temperatures over the range of18 °C to 37 °C. However, oocyte maturationstages increased as temperatures rose from 18 °Cto 27 °C, with mature ova first being found at thelatter temperature. No significant differences amongmaturation stages were found between27 °C–37 °C. At salinities ranging from of0 ppt to 56 ppt, no significant differences were found betweenmean GSI's, except for the two extremes of the testrange. The ovaries of fish kept in distilled watercontained primordial germ cells only. In feedingexperiments, significant differences were found onlybetween the ovaries (GSI's and oocyte maturationstages) of fish deprived of food and those fed at≥ 1% body weight per day. Regarding photoperiod,a decrease in day length from 14L:10D (the longest dayof the year) to 10L:14D (the shortest) caused adecrease in oocyte maturation stages. Fish at theintermediate level (12L:12D) still had ovariessuitable for spawning, whereas those at 10L:14D didnot. The results of this study show that limitinglevels for adequate reproductive condition were foundfor some of the factors investigated, however, rangesof the factors above these levels were relativelylarge. That Aphanius dispar's reproductivecondition may be controlled in an artificialenvironment is essential for it to be mass produced,and a prerequisite for its use in the biologicalcontrol of mosquito larvae.
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