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  • Inorganic Chemistry  (3,365)
  • Biology
  • Cell & Developmental Biology
  • 2005-2009  (22)
  • 1935-1939  (3,946)
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  • 1
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2009-11-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vogel, Gretchen -- New York, N.Y. -- Science. 2009 Nov 6;326(5954):788-91. doi: 10.1126/science.326_788.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19892956" target="_blank"〉PubMed〈/a〉
    Keywords: *Academies and Institutes/economics/organization & administration ; Anthropology ; Biology ; Chemistry ; Germany ; Germany, East ; Physics ; Research Personnel ; Universities
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2021-05-19
    Description: L’étude porte sur l’évolution du pH et de la température au cours de la transformation artisanale du Cymbium, ainsi que sur les perspectives de valorisation du produit transformé. Les expérimentations menées au site de transformation artisanale de Joal ont permis de constater que : Après 12 heures de séjour en bac (1ère nuit), le Cymbium est encore en phase de rigor mortis. Le pH moyen affiché à l’issue de cette première nuit est de 7,6 ; donc proche de celui du mollusque vivant ; Le pH moyen du produit fini est légèrement acide et se situe entre 6,3 et 6,4. Donc le yeet de Joal est très peu fermenté ; Les difficultés de séchage notées sont dues : soit au manque de maîtrise des paramètres tels que, la température, l’humidité relative et la vitesse de l’air, soit à l’absence de protection du produit en cours de séchage contre les intempéries. Les essais sur les perspectives de valorisation montrent que : 47,64% du poids du Cymbium dépourvu de sa coquille font l’objet de rejets sous forme de rebuts (surtout en milieu industriel) ; Les enzymes végétales que sont, la bromélaïne, contenue dans le jus d’ananas, et la papaïne, contenue dans le latex de papaye, ainsi que les acides organiques contenus dans le vinaigre et le jus de citron, favorisent l’acidification et accélèrent la fermentation, tout en améliorant le goût, l’odeur et la texture du produit fini ; Les meilleurs résultats sont obtenus dans le cas de la fermentation sous température contrôlée, au laboratoire, où le pH du produit fini se situe entre 4,3 et 4,7. Enfin, sur l’ensemble de l’étude, il est prouvé que les rendements obtenus pour les produits ayant subi un processus de transformation complète (dans le cas des essais sur les perspectives de valorisation) sont faibles par rapport à ceux transformés à Joal. Ces rendements vont de : 2,88 à 28,57% pour le premier groupe de produits ct 31,4 à 58,3% pour le second groupe de produits.
    Description: Université Cheikh Anta Diop, Institut Universitaire de Pêche et d'Aquaculture, Dakar (Senegal)
    Description: Unpublished
    Description: cymbium; transformation artisanale; biologie; commercialisation; fermentation; séchage; température; pH; statistiques
    Keywords: pH ; Marketing ; Biology ; Fermentation ; Drying ; Temperature ; Processing fishery products ; Fermentation ; Biology ; Marketing ; Drying ; Temperature ; Statistics
    Repository Name: AquaDocs
    Type: Theses and Dissertations , Bachelor thesis
    Format: 132
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  • 3
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2008-11-22
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Enserink, Martin -- New York, N.Y. -- Science. 2008 Nov 21;322(5905):1184-5. doi: 10.1126/science.322.5905.1184.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19023058" target="_blank"〉PubMed〈/a〉
    Keywords: Academies and Institutes/economics/*history ; Biology ; History, 20th Century ; Pathology ; Romania
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 2008-03-22
    Description: Minerals are more complex than previously thought because of the discovery that their chemical properties vary as a function of particle size when smaller, in at least one dimension, than a few nanometers, to perhaps as much as several tens of nanometers. These variations are most likely due, at least in part, to differences in surface and near-surface atomic structure, as well as crystal shape and surface topography as a function of size in this smallest of size regimes. It has now been established that these variations may make a difference in important geochemical and biogeochemical reactions and kinetics. This recognition is broadening and enriching our view of how minerals influence the hydrosphere, pedosphere, biosphere, and atmosphere.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hochella, Michael F Jr -- Lower, Steven K -- Maurice, Patricia A -- Penn, R Lee -- Sahai, Nita -- Sparks, Donald L -- Twining, Benjamin S -- New York, N.Y. -- Science. 2008 Mar 21;319(5870):1631-5. doi: 10.1126/science.1141134.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for NanoBioEarth, Department of Geosciences, Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA 24061-0420, USA. hochella@vt.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18356515" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; Biology ; Geologic Sediments/chemistry ; Humans ; *Minerals/chemistry/metabolism ; *Nanoparticles ; Oceans and Seas ; Particle Size ; Solubility ; Thermodynamics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
    Keywords: Biology ; Data processing ; Chemistry ; Chemistry, Physical organic ; Materials ; Nanotechnology
    ISBN: 9781402081897
    Language: English
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  • 6
    Keywords: Biochemistry ; Biology ; Data processing ; Biomedical engineering ; Chemistry ; Chemistry, Physical organic ; Materials
    ISBN: 9781402081842
    Language: English
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  • 7
    Publication Date: 2021-05-19
    Description: La creciente importancia que los recursos de calamar han adquirido en 105 últimos 30 años, los sitúa actualmente entre los más importantes recursos pesqueros del mundo. En consecuencia, paises tradicionalmente no explotadores o consumidores de productos de calamar, han orientado sus esfuerzos hacia el logro de un mejor conocimiento de las especies de cefalópodos que habitan su ambiente marino. En este sentido el aporte de disciplinas tales como la biología ha sido decisivo para desarrollar en forma exitosa pesquerías de calamar, entre otras.El programa de investigaciones del Instituto Nacional de Pesca para 1980 incluyó el estudio integral de la explotación de los calamares como un primer paso hacia el desarrollo de una pesquería del recurso. Este trabajo presenta los resultados de un estudio de los aspectos biológicos de la especie más importante del área: Illex argentinus y forma parte de una serie de tres documentos técnicos escritos por el autor referentes a recursos de calamar. Dichos documentos están relacionados con la tecnología de captura y la producción y comercialización del calamar en el Uruguay.
    Description: The growing importance of the squid resources during the last 30 years place them among the more important fish resources of the world. Therefore countries traditional1y non exploiters or consumers of squid products gave steps toward a better knowledge of the species of cephalopods inhabiting their marine environment. For instance, the contribution of subjects such as the biology lead to a successful development of squid fisheries, among others. The 1980 research program of the National Fisheries Institute included an integral study of the exploitation of the squids as a first step toward the development of a squid fishery. This paper presents the results of a study on the biological aspects of the principal species of the area: Illex argentinus. It is part of three technical reports written by the author on squid resources. These reports are fishery technology and production & marketing of squids in Uruguay.
    Description: Montevideo: Instituto Nacional de Pesca
    Description: Published
    Description: Illex argentinus, calamar, ZCP, biología, comportamiento, condiciones ambientales, desove, reproducción, relación de sexos, madurez sexual, crecimiento, frecuencia de longitudes, migraciones
    Keywords: Population structure ; Spawning ; Length ; Growth ; Biology ; Environmental conditions ; Spawning grounds ; Sex ratio ; Sexual maturity ; Reproduction ; Behaviour ; Biology ; Environmental conditions ; Population structure ; Spawning ; Spawning grounds ; Sex ratio ; Sexual maturity ; Reproduction ; Length ; Behaviour ; Migrations ; Growth
    Repository Name: AquaDocs
    Type: Report
    Format: 50
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  • 8
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-05-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marshall, Eliot -- New York, N.Y. -- Science. 2007 May 25;316(5828):1112.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17525309" target="_blank"〉PubMed〈/a〉
    Keywords: Biology ; *Federal Government ; History, 21st Century ; Minnesota ; Nobel Prize ; Politics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
    Unknown
    Dordrecht : Springer
    Keywords: Biology ; Data processing ; Biomedical engineering ; Chemistry
    ISBN: 9781402035876
    Language: English
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  • 10
    Keywords: Bioinformatics ; Biology ; Data processing ; Biotechnology ; Computer software ; Data structures (Computer science) ; Genetic engineering
    ISBN: 9782287339097
    Language: English
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  • 11
    Publication Date: 2021-05-19
    Description: This journal is published by NIOF, Alexandria, Egypt
    Description: General pattern of gonadal development in female Trachinotus ovatus was divided into six maturity stages, which are; immature, maturing, nearly ripe, ripe, spawning and spent stages. The maximum value of gonadosomatic index (GSI) was attained in June and July. Total protein content in ovaries varied according to different maturity stages recording maximum value at immature ovaries and minimum at spawning and spent ovaries. The values of GSI in ovaries were inversely correlated to their total protein content at different maturity stages. Seven amino acids (proline, alanine, valine, methionine, isoleucine, leucine and histidine) were found to increase significantly in ripe ovary, followed by a significant decrease in both spawning and completely spent ovaries. While, arginine and threonine reached their maximum concentration in the spawning period. On the other hand, serine amino acid reached their minimum value in the ripe ovary. Total lipid contents of ovaries reached their minimal values at immature stage, while the maximum recorded value was at the nearly ripe gonad. The ovarian total lipid contents approximately followed the same manner of the GSI according to the different maturity stages except in spawning period. Many differences were detected in fatty acid concentrations in female Trachinotus ovatus ovaries in relation to different maturity stages. Eicosapentaenoic acid content varied according to the stage of sexual maturity. While, the maximum recorded value of arachidonic acid was at the ripe stage. Palmitic acid and oleic acid had the highest concentrations among fatty acids, while those with low concentrations were pentadecanoic acid and gadoleic acid.
    Description: NIOF
    Description: Published
    Keywords: Trachinotus ovatus ; Ovaries ; Total proteins and amino acids ; Total lipids and fatty acids ; Biology ; Fish
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 12
    Publication Date: 2021-05-19
    Description: Thèse
    Description: Résumé : En Mauritanie, un constat clair met en évidence une tendance de sur-exploitation « en série» des stocks à haute valeur, des Mugilidés; le mulet jaune premièrement, puis ensuite le mulet noir et le mulet doré (espèces pouvant être considérées de substitution). L’exploitation intensive du mulet jaune à partir de 1996 a conduit au ciblage du mulet noir à partir de 1998 et puis, plus récemment encore, celui du mulet doré en 2001. L’absence d’une gestion rationnelle risque de conduire, dans moins de sept ans à la quasi-disparition de ces ressources (logiquement renouvelables). C’est dans ce contexte de baisses des rendements, auquel s’ajoute la dégradation des zones littorales par l’action anthropique sans cesse croissante, que ce travail a permis d’approfondir les connaissances scientifiques du domaine paralique en général, des zones de dilutions en particulier et d’étudier les structures démographiques (taille, âge, sex-ratio) et la reproduction (saison et aire de ponte) des trois Mugilidae les plus ciblés. Ce travail explique également, les stratégies d’occupation du littoral atlantique mauritanien en différentes périodes par ces trois poissons très côtiers, donc fortement affectés par les changements environnementaux et les diverses activités littorales (impacts des ouvrages construits dans cette zone). Il a montré l’existence de divergences dans les préférences de l’occupation des milieux par ces ressources et même leurs tolérances aux conditions climatiques pour l’accomplissement des différentes phases de leurs cycles de vie. On retrouve les adultes des trois espèces, avec des abondances saisonnières très marquées, sur la bande côtière de faible profondeur (moins de 30 m) en déplacement nord - sud pour la reproduction et sud - nord pour l’alimentation. La répartition en fonction du milieu et de l’âge montre une fois encore que les adultes de Liza aurata sont résidants au nord du Banc d’Arguin et dans la baie du Lévrier et n’effectuent que des migrations limitées dans cet espace, tandis que les juvéniles peuvent être emportés par les courants jusqu’à Nouakchott et même à l’embouchure. Quant aux adultes des Mugil cephalus et Mugil capurrii, ils accomplissent intégralement leur cycle de vie en mer et seuls les juvéniles pondus à la proximité du delta du fleuve rentrent dans l’estuaire pour rester environ deux ans et demi avant de regagner définitivement la mer à nouveau. Ce schéma n’exclu pas les possibilités de rencontrer, même accidentellement la L. aurata au bas delta du Sénégal ou bien évidemment les autres espèces dont les déplacements sont fortement liés aux conditions hydroclimatiques. Abstract : In Mauritania there is clear evidence of an overfishing tendency “in series” of high value stocks of Mugilidae; in decreasing degree of importance of the Common Grey Mullet, then the Narrow-head Grey Mullet and finally the Golden Gray Mullet (a species that can be considered as a surrogate species). The intensive exploitation of the Common Grey Mullet which began in 1996, has resulted in the targetting the Narrow-head Grey Mullet since 1998 and more recently the exploitation of the Golden Grey Mullet in 2001. In a time frame of less than seven years, the absence of rational management risks the near complete disapearance of these resources (resources otherwise renewable). To this situation of decreasing yields, which is worsen by the degradation of the coastal zone due to an ever increasing antropic pollution, that this study aims to increase our scientific knowledge of confined systemes, of dilution zones and of population structure (size, age, sex-ratio) and reproduction (spawing areas and season) of the three most targetted Mugils. This study also explains the utilisation strategies of the Mauritanian Atlantic coast during different time periods by these three very coastal fish, which are subjected to environmental changes and diverse coastal activities (impacts of construction in this zone). This study shows the existance of diverging habitat use and tolerances to climatic conditions during the different life cycle phases. We find adults of the three species to have very marqued seasonal abondances, on the shallow coastal band (of less than 30 m) in displacement north-south for reproduction and south-north for feeding. The spacial and age distribution of Liza aurata adults show once again that they are residents of the northern bank of Arguin and of the Bay of Lèvrier and that they undergo limited migrations in this zone. However, the juveniles of this species may be transported by currents as far as Nouakchott incluing the river mouth. In contrats, adults of Mugil cephalus and Mugil capurri undego their entire life cycle at sea with only juveniles spawned in proximity of river deltas entering the estuaries to remain about two and a half years before returning definitevely to the sea. This present schema dosen’t exclude the accidental possibility of finding L. aurata in the lower Senegal delta or in other areas where their displacements are closely linked to hydroclimatique conditions.
    Description: IMROP
    Description: Unpublished
    Description: Aménagement, 〈Mugil cephalus〉 ,〈 Liza aurata〉, 〈 Mugil capurrii〉, Dynamique d’exploitation, Ecobiologie, Reproduction, Mugilidés
    Keywords: Distribution ; Biology ; Legislation ; Reproduction ; Biology ; Distribution ; Ecological distribution ; Exploitation ; Abundance ; Legislation ; Reproduction ; Stock identification ; Zonal distribution
    Repository Name: AquaDocs
    Type: Theses and Dissertations , Master thesis
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  • 13
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    Alexandria: National Institute of Oceanography and Fisheries
    Publication Date: 2021-05-19
    Description: This journal is published by NIOF, Alexandria, Egypt
    Description: The effect of metrifonate on the immunity of the exposed fish are evaluated through the determination of the antibody titer and mortality rate during the challenge trial. In the chronic toxic exposure to metrifonate by dose 0.17mg/liter for 8 weeks, the more clear signs were darkness of fish color with hemorrhagic patches & loosing of scale at end of the trial the color return to normal. Determination of some blood parameters revealed significant decrease of white blood cell count, as there were lymphopenia and nueutrophilia during the chronic exposure to metrifonate. Phagocytic assay revealed a significant decrease in both phagocytic activity (PA) and phagocytic index(PI).Hypoproteinami hypoglobulinaemia and hypoalbuminaemia were observed. The challenge trial indicted that, the metrifonate decrease the immunity of exposed fish.. The using of biogen“R” as a growth promoter in fish diet minimized the toxicity of metrifonate.
    Description: NIOF
    Description: Published
    Description: Immunosuppressive, Metrifonate, Oreochromis niloticus
    Keywords: Biology ; Biology ; Immunology
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 14
    Publication Date: 2021-05-19
    Description: L’étude du cycle sexuel de l’Anchois montre que la principale période de reproduction s’étend d’avril à octobre. Celle-ci serait sous la dépendance principale de l’élévation de la température de surface. La croissance, abordée à l’aide des marques supposées journalières sur les otolithes, donne des résultats jugés satisfaisants jusqu’à 10 cm L.F. Par contre, ceux concernant les tailles supérieures devront être confirmés.
    Description: IMROP
    Description: Published
    Description: Anchois, Reproduction, Biologie, Croissance, Cycle sexuel, Otolithes, Engraulis encrasicolus
    Keywords: Growth ; Otoliths ; Biology ; Sexual maturity ; Sexual reproduction ; Biology ; Growth ; Otoliths ; Sexual maturity ; Sexual reproduction
    Repository Name: AquaDocs
    Type: Refereed , Article
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  • 15
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2005-12-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 2005 Dec 23;310(5756):1880-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16373539" target="_blank"〉PubMed〈/a〉
    Keywords: Astronomical Phenomena ; Astronomy ; Biology ; Brain/growth & development ; Brain Diseases/genetics ; Climate ; Earth (Planet) ; Evolution, Planetary ; Humans ; Nuclear Reactors ; Plant Development ; Plants/genetics ; Potassium Channels ; *Research ; Systems Theory
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 16
    Publication Date: 2021-05-19
    Description: Etude réalisée dans le cadre des activités de recherche de l’Institut National des Sciences et Technologies de la Mer (INSTM)
    Description: Unpublished
    Keywords: Répartition sexuelle ; Thon rouge ; Biométrie morphologique ; Scombridés ; Ressources pélagiques ; Biologie ; Pelagic fish ; Biology ; Biometrics
    Repository Name: AquaDocs
    Type: Theses and Dissertations , Master thesis
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  • 17
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    Alexandria: NIOF
    Publication Date: 2021-05-19
    Description: In a second study of electromicroscopic analysis of ultrastructural organelles of coho salmon muscle showed a significant increase in lipid droplet density in the largest stages compared with the smallest fish. The opposite was observed with the mitochondria where its density decreased in the large sized fish. An apparent decrease in capillary density with increasing body mass was also observed. These finding may imply a possible additional role of lipid depot as fish grew from parr to smolt.
    Description: Published by NIOF, Alexandria
    Description: Published
    Keywords: Ultrastructure ; Cohosalmon ; Lipid droplets ; Salmon ; Biology ; Fish
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 18
    Publication Date: 2021-05-19
    Description: Study of microscopic structural changes of red and white muscle of coho salmon, Oncorhynchus kisutch, through different developmental stages and through transition from parr to smolt revealed developmental variation in fibre size where white fibres were larger than red ones. The increase in fibre area, characterizing all stages of development, was associated with reduction in both fibre and capillary densities. In large fish the reduction in red muscle capillary density was 10 fold lesser than that of white muscle.
    Description: Published by NIOF, Alexandria
    Description: Published
    Keywords: Oncorhynchus kisutch ; White fibres ; Red fibres ; Biology ; Salmon ; Biology ; Fish
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 19
    Publication Date: 2021-05-19
    Description: Il y a des annexes
    Description: Résumé : La biologie de la langouste rose des côtes mauritaniennes est aujourd’hui bien connue. Nous avons cependant rappelé les traits marquants. Sur le plan de la pêche, de 1963 à 1988, le stock de la langouste rose a connu trois phases d’exploitation. Après une phase de surexploitation entre 1963 et 1970-1971, le stock de langouste rose de Mauritanie a pu se reconstituer grâce à une réduction importante du nombre de langoustiers. Ceci c’est traduit à partir de 1971 par une augmentation sensible des captures et aussi de la PUE. Mais le dédoublement du nombre de ces derniers en 1987 et 1988 a fait chuter les P.U.E de 50% ce qui est un signe d’effondrement du stock à nouveau.
    Description: Abstract : Biology of Mauritanian pink lobster is known. However we presented some important aspects of specie’s biology. On fisherie’s plan, between 1963 and 1988, the stock of Mauritanian pink lobster went through three phases of exploitation. Like this, after an over exploitation phase between 1963 and 1970-1971. The stock of the pink lobster of Mauritania was reconstituted little by little owing to an important reduction enabled a significant increase in the number of catches and the C.P.U.E. But doubling in the number of beats in 1987 and 1988 reduced the C.P.U.E. by 50%, which again contributed to the breaking down of stock.
    Description: IMROP
    Description: Published
    Keywords: Pêche ; Etat des stocks ; Mauritanie ; Biologie ; Fishing ; Langouste rose ; Biology ; Palinurus mauritanicus ; Mauritania ; Status of stocks ; Pink lobster ; Lobster culture
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 20
    Publication Date: 2021-05-19
    Description: Thèse pour l’obtention du grade de Docteur de l’Université de Bretagne Occidentale spécialité océanologie biologique
    Description: RESUME: Les eaux océaniques mauritaniennes sont au carrefour d'eaux froides et salées provenant du Nord, et d'autres chaudes et moins salées du Sud. L'interaction de ces eaux est à l'origine d'un régime hydrologique à 4 saisons: une saison froide de janvier à mai, une saison de transition froide-chaude de juin à juillet, une saison chaude d'août à octobre et enfin une saison de transition chaude – froide de novembre à décembre. La présente étude met en relation ces variations hydrologiques saisonnières, la distribution et la biologie de Mustelus mustelus. La distribution spatiale et temporelle de M. mustelus sur le plateau continental mauritanien a été suivie en analysant les données récoltées au cours de 20 campagnes de prospections scientifiques, 13 hauturières et 7 côtières, réparties sur les 4 saisons hydrologiques qui caractérisent cette zone géographique. La population d'émissoles est concentrée au Nord du Cap Timiris. L'espèce ne semble pas effectuer de migration latitudinale, mais un déplacement côte - large et inversement a été mis en évidence. Durant la saison froide, cette espèce à affinité tropicale est repoussée vers la côte, dans la Baie du Lévrier et le Nord Est du Banc d'Arguin par les basses températures venant du Nord qui persistent sur le plateau continental mauritanien de janvier à mai. Ce sont surtout les mâles matures qui rejoignent alors, pour l'accouplement, les femelles, de distribution plus côtière. Entre juin et octobre, avec le réchauffement des eaux, les mâles commencent à se déplacer vers des eaux plus profondes. Mais dès le début du refroidissement, un nouveau mouvement vers la côte s'amorce. Un échantillonnage mensuel des débarquements de la Pêche Artisanale a permis de collecter, en 2 ans, 2510 séries de données individuelles exploitées pour les études de l'alimentation, de la reproduction et de la croissance. L'étude des contenus stomacaux n'a pas montré de différence significative entre les femelles et les mâles, l'analyse a été faite sans distinction des sexes. Le nombre d'estomacs vides est de 10,3 % des estomacs examinés. La distribution Nord de M. mustelus pourrait être liée à l'abondance des principales proies de l'espèce, les bernard-l'hermites (Anomoures). En effet, ces proies qui seraient abondantes dans sa zone de répartition sont dominantes aussi bien en termes de nombre que de poids et d'occurrence dans les contenus des estomacs examinés. Les proies secondaires sont des Poissons, des Mollusques et des Annélides. Ainsi, l'émissole serait une espèce opportuniste qui se nourrit principalement de proies les plus vulnérables et accessoirement de proies de capture plus difficiles. L'étude du régime alimentaire chez l'émissole lisse en Mauritanie témoigne d'un comportement en rapport étroit avec le fond. La distribution différentielle des deux sexes influence le sex ratio qui est en faveur des femelles dans la zone côtière et des mâles dans la zone hauturière. La taille de première maturité sexuelle de M. mustelus en Mauritanie est de 67 cm pour les mâles et 72 cm pour les femelles. Chez les femelles, l'activité vitellogénique est continue et dure toute l'année chez les femelles matures (y compris gestantes) sauf en période de fécondation, période pendant laquelle elle est arrêtée. Le nombre d'ovocytes vitellogèniques de grand diamètre (supérieur ou égal à 10 mm) atteint un maximum en mai dans l'unique ovaire droit présent chez les émissoles lisses. La chute de leur nombre dans l'ovaire en juin et juillet annonce l'ovulation. Les mâles s'accouplent avec les femelles entre janvier et mai; les spermatozoïdes sont alors stockés dans le tiers inférieur des glandes nidamentaires jusqu'à la période de fécondation (juillet-août). L'organogenèse dure jusqu'aux mois d'octobre – novembre; elle aboutit alors à des embryons qui ressemblent morphologiquement aux adultes, au-delà de ces mois, le développement embryonnaire se limite à une augmentation de taille et de poids. Les embryons sortent de leurs capsules, les réserves vitellines se résorbent et sont remplacées par le placenta. Chez les femelles, la durée de la gestation est de 7 à 10 mois. Les femelles commencent à mettre bas à partir de février, la parturition se poursuit jusqu'en juin, mois pendant lequel les rares femelles encore gestantes mettent bas. A la naissance les juvéniles ont des tailles comprises entre 240 et 320 mm. La fécondité utérine maximale observée au cours de cette étude est 13 embryons; la moyenne est de 4 embryons par portée. Les bandes de croissances observées dans des coupes de vertèbres de femelles de 45 à 99 cm et de mâles de 50 à 85 cm de longueur totale ont été utilisées pour l'estimation de l'âge des poissons. Les données d'âge et de longueur ont permis d'établir les équations de croissances selon les modèles de Von Bertalanffy et de Holden. Ces modèles conduisant à des résultats différents; celui de Von Bertalanffy a été retenu en raison de sa flexibilité qui rend son application plus courante dans les pêcheries. Les paramètres de ce modèle sont, pour les femelles K=0,21, L∞=113,4 et t0=-2,03, pour les mâles K=0,26; L∞=91,3 et t0= -2,43. Les femelles ont donc des croissances plus rapides que les mâles et les âges à la première maturité sexuelle sont de 2,6 ans pour les mâles et de 2,8 pour les femelles. #
    Description: ABSTRACT: Mauritanian coastal waters are crossroads between cold and salted northern waters, and warmer and less salted southern waters. The interaction of these waters is at the origin of four hydrological seasons: cold (January to May), cold-to-warm transition (June-July), warm (August to October) and warm-to-cold transition (November-December). The present study connects these seasonal hydrological variations with the distribution and biology of Mustelus mustelus. Spatial and temporal distribution of M. mustelus on the Mauritanian continental shelf was followed while analyzing data collected during 20 scientific campaigns, 13 deep-sea and 7 coastal, distributed over the 4 hydrological seasons which characterize this geographical area. Smoothound sharks population is concentrated North of Cape Timiris. The species does not seem to carry out of latitudinal migration, but a coast to deep sea displacement - and conversely a deep sea to coast - was found. During the cold season, this species with tropical affinity is pushed back towards the coast, in Baie du Lévrier and Northeast of the Banc d’Arguin by cold water temperatures coming from the North which persist on the Mauritanian continental shelf from January to May. Mature males then join, for the coupling, females, which are of more coastal distribution. Between June and October, with the reheating of water, males start to move towards deeper water. But from the very start of cooling, a new movement towards the coast starts. A monthly sampling of the artisanal fishery catches made it possible to collect, in 2 years, 2,510 individual specimen data for the study of food, reproduction and growth. The study of stomach contents did not show a significant differences between females and males. The analysis was made regardless of gender. The number of empty stomachs is 10,3 % of the examined stomachs. The Northern distribution of M. mustelus could be related to the abundance of the principal prey species, the hermit crab (Anomoura). Indeed, these preys which would be abundant in its zone of distribution are dominant in terms of number, biomass and occurrence in the contents of the examined stomachs. The secondary preys are of fish, molluscs and annelids. Thus, smoothound shark would be an opportunist species which feeds mainly on the most vulnerable preys and incidentally on more difficult preys of capture. The study of the smoothound shark diet in Mauritania testifies to a behavior in close connection with the bottom. The differential distribution of the two sexes influences the sex ratio which is in favor of females in the coastal zone and males in the deep-sea zone. Size at first sexual maturity of M. mustelus in Mauritania is 67 and 72 cm for males and females, respectively. For females, the vitellogenic activity is continuous year-round for mature females (including gestating ones), except during the period of fecundation. The number of vitellogenic ovocytes of large diameter (greater or equal to 10 mm) reaches a maximum in May in the single right ovary of the smoothound shark. The fall of their number in June and July announces ovulation. Males couple themselves with females between January and May; spermatozoids are then stored in the nidamental glands lower third until the period of fecundation (July-August). Organogenesis lasts until October - November; it then leads to embryos which resemble to the adults morphologically. Afterwards, the embryonic development is limited to an increase in size and weight. The embryos leave their capsules, vitellogenic reserves reabsorb and are replaced by the placenta. Gestation period is 7 to 10 months for females. The females start to put low as from February, parturition continues until June, month during which the rare still gestating females give birth. With birth the youthful ones have sizes ranging between 240 and 320 mm. The maximum observed fecundity during this study is 13 embryos; the average is of 4 embryos per litter. Growth bands observed in cuts of vertebrae on females and males of total length ranging from 45 to 99 cm and from 50 to 85 cm, respectively, were used to estimate fish age. Age and length data made it possible to establish growth equations according to Von Bertalanffy and Holden’s models. These models lead to different results; Von Bertalanffy model was retained because of its flexibility which makes its application more current in fisheries. The parameters of this model are K=0.21, L∞=113.4 for females and t0= -2.03, and K=0.26 L∞=91.3 and t0 = -2.43 for males. The females tend to grow faster than males and the age at the first sexual maturity is 2.6 and 2.8 years for males and females, respectively.
    Description: IMROP
    Description: Unpublished
    Keywords: Mauritania ; Croissance ; Biologie ; Biology ; Physical environment ; Mauritanie ; Ecology ; Fecundity ; Growth ; Emissole lisse ; Alimentation ; Smouthound shark ; Mustelus mustelus ; Fécondité ; Reproduction ; Milieu physique ; Ecologie ; Distribution ; Shark fisheries
    Repository Name: AquaDocs
    Type: Theses and Dissertations , Master thesis
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    CNROP - AtlantNIRO -MEIPP-sa, 2001 plaquette de vulgarisation
    Publication Date: 2021-05-19
    Description: Le présent prospectus donne une courte caractéristique biologique des principales espèces pêchées dans la Zone Economique Exclusive Mauritanienne et des engins utilisés pour la pêche, ainsi que les informations relatives à leur composition chimique, à la valeur nutritive de la matière première, et à ses caractéristiques avec les possibilités de sa transformation en différents produits. Les informations présentées pourront être utiles aux producteurs pour le choix de la matière première et des possibilités de sa valorisation
    Description: IMROP / AtlantNIRO / MEIPP-sa
    Keywords: Fishery resources ; Valorisation produits ; Composition chimique ; Biologie ; Ressources halieutiques ; Biology ; Valeur nutritive ; Fish processing ; Transformation des produits ; Engins de pêche ; Food value ; Fishing gear ; Fish species ; Processing fishery products
    Repository Name: AquaDocs
    Type: Other
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    Publication Date: 2021-05-19
    Description: L’étude porte sur l’exploitation, la biologie et la dynamique du poulpe (Octopus vulgaris, Cuvier) des eaux mauritaniennes. La répartition spatio-temporelle dans la région du Cap Blanc ne semble être liée ni à la taille, ni au sexe, mais varie au cours de l’année. L’analyse de l’état actuel de la pêcherie basée sur les congélateurs céphalopodiers met en évidence une augmentation de l’effort de pêche et la poursuite de chute des p.u.e. La composition des captures révèle une progression du pourcentage des individus de poids inférieur à 200 grammes (« poulpo »). L’étude biologique montre qu’il existe deux saisons de reproduction par an (mai-juillet et septembre-novembre) qui engendrent deux recrutements, l’un en mai et l’autre à partir de septembre. La croissance pondérale a été obtenue sur les des distributions de fréquences de poids. Une transformation des poids en longueurs a permis de déterminer les paramètres de l’équation de VON BERTALANFFY pour chaque cohorte. Après détermination des coefficients de mortalité naturelle et par pêche, les résultats obtenus par le modèle global et le modèle de RICKER sont discutés. La mise en œuvre d’un modèle global montre que le niveau actuel des captures est proche de la prise maximale équilibrée et que l’effort de pêche ne doit pas être augmenté. //
    Description: This study deals with the exploitation, the biology and the dynamics of common octopus (Octopus vulgaris, Cuvier) in Mauritanian waters. In the Cap Blanc region, the spatio-temporal distribution appears to be independent of the length and sex but variable through the year. The analysis of the present state of the fishery reveals an increase of the fishing effort and continuous decrease of the catch per unit effort. An increase of the small individuals, with weight under 200 g (“poulpo”), can be seen from catches composition. The biological study shows that there are two spawning seasons (May-July and September-November) which allow two recruitments in May and September. The growth parameters of the VON BERTALANFFY equation are calculated from the transformed weights in lengths. The calculated mortality coefficients are used in a RICKER’s model of yield per recruit and the results are discussed. The use of a generalized production model shows that the present catch is very close to the maximum sustainable yield. Therefore, one would aware to prevent an increase of the fishing effort.
    Description: IMROP
    Description: Unpublished
    Keywords: Reproduction ; Common octopus ; Population dynamics ; Environnement ; Dynamique de population ; Exploitation ; Environment ; Poulpe ; ZEE Mauritanienne ; Distribution ; Mauritanian Exclusive Economic Zone ; Biologie ; Croissance ; Growth ; Octopus vulgaris ; Biology ; Octopus fisheries
    Repository Name: AquaDocs
    Type: Theses and Dissertations , Master thesis
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    Electronic Resource
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 240 (1939), S. 142-144 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Der Versuch von P. E. WRETBLAD, die β-Phase des As—Sb Systems als Oxyd auszudeuten, wird als vollständig unbegründet zurückgewiesen.
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    Zeitschrift für anorganische Chemie 240 (1939), S. 161-166 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Bei der Oxydation von Ferrosalzlösungen in alkalischer Lösung entsteht ferromagnetisches δ-Fe2O3.
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    Zeitschrift für anorganische Chemie 240 (1939), S. 217-231 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Untersuchung verschiedener physikalischer Eigenschaften von wäßrigen Jodsäurelösungen wird im einzelnen beschrieben. Durch Anwendung der Mischungsgleichung zur Eliminierung des Lösungsmitteleinflusses werden Kurven über die Abhängigkeit der untersuchten physikalischen Eigenschaft von der Konzentration der Lösung erhalten, die bei 0,1 n und 0,04 n Knicke bzw. Unstetigkeiten aufweisen. Alle Kurven ergeben praktisch das gleiche Bild. Diese Unstetigkeiten werden in der Weise gedeutet, daß bei den genannten Konzentrationen eine Depolymerisation von (HJO3)3 unter Bildung einfacher Moleküle eintritt, wahrscheinlich der Übergang (HJO3)3 → (HJO3)2 → (HJO3). Eine Prüfung der Ramanspektren bestätigte diesen Befund.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 395-415 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der thermischen Zersetzung des Si10Cl20H unter Normaldruck bei 300° entsteht in einer inerten Gasatmosphäre ein fester, gelber Körper von blättriger, amorpher Struktur. Die Analyse ergibt ein Atomverhältnis von Si : Cl wie 1,00:1,00. Bei der Zersetzung mit Kalilauge löst sich der gelbe Körper unter stürmischer Wasserstoffentwicklung vollständig auf. Die Reaktion verläuft nach \documentclass{article}\pagestyle{empty}\begin{document}$$ 2\;{\rm SiCl} + 6\;{\rm KOH} = 2\;{\rm KCl} + 2\;{\rm K}_{\rm 2} {\rm SiO}_{\rm 3} + 3\;{\rm H}_{\rm 2} . $$\end{document}.
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    Zeitschrift für anorganische Chemie 240 (1939), S. 198-208 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es wurden die Gleichgewichtsverhältnisse zwischen niedermolekularer und höher aggregierter Kieselsäure in verdünnten Natriumsilikatlösungen in Abhängigkeit von [H+], Alter und Art der Säure studiert.
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    Zeitschrift für anorganische Chemie 240 (1939), S. 232-240 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 240 (1939), S. 241-260 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 241 (1939), S. 273-280 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Gitterkonstanten der C-Formen der Sesquioxyde von Neodym, Samarium, Europium, Gadolinium, Terbium, Dysprosium, Erbium, Thulium, Ytterbium und Cassiopeium wurden neu bestimmt. Die Gitterkonstanten der Oxyde von Gadolinium bis Cassiopeium bilden eine stetige Kurve, die der Oxyde von Neodym bis Gadolinium eine zweite stetige Kurve; die beiden Kurven schneiden sich beim Gadolinium. Dies zeigt, daß die von W. KLEMM aufgestellte Systematik der seltenen Erden auch für die Radien der 3 wertigen Ionen und die davon direkt abhängenden Eigenschaften der seltenen Erden gilt.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 107-114 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Das Bild, das sich zusammenfassend von dem Ablauf der Fluoraustreibung aus Fluorapatit durch Wasserdampf und Kieselsäure ergibt, ist folgendes: 1Fluorapatit und Kieselsäure setzen sich ohne Wasserdampf nicht um.2Wasserdampf wirkt auf Fluorapatit auch ohne Kieselsäure ein. Dabei tritt nach Entfernung von mehr als der Hälfte des Fluors eine deutliche Abnahme der Umsetzungsgeschwindigkeit ein. Röntgenaufnahmen zeigen, das bis etwa zu dieser Grenze die Fluorapatitstruktur ohne Linienverschiebungen unverändert erhalten bleibt. Erst danach wid der Übergang zu Hydroxylapatit bemerkbar.3Durch Kieselsäure wird der Umsatz von Fluorapatit und Wasserdampf erst oberhalb etwa 1300° beschleunigt. Es bildet sich dann ein kieselsäurehaltiges α-Ca3P2O8.
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    Zeitschrift für anorganische Chemie 242 (1939), S. 237-248 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 242 (1939), S. 33-40 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Rb2O kristallisiert im Anti-CaF2-Typ mit a = 6,742 Å.
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    Zeitschrift für anorganische Chemie 242 (1939), S. 375-392 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 243 (1939), S. 1-13 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (a) Aus Na, SiO, und NaOH oder NaF entsteht bei Temperaturen bis 500° keine Additionsverbindung.
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    Zeitschrift für anorganische Chemie 243 (1939), S. 127-137 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Struktur des Nitrosylchlorids wird diskutiert. Es wird gezeigt, daß hier Resonanz zwischen drei kanonischen Strukturen möglich ist. Je nachdem man die Literaturwerte für den Cl—N-Ab-stand von 1,95 Å oder 1,7 Å zugrunde legt, gibt die Ionenstruktur oder geben die kovalenten Strukturen den überwiegenden Beitrag zum stationären Zustand.
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    Zeitschrift für anorganische Chemie 243 (1939), S. 174-184 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 242 (1939), S. 277-280 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Holmium kristallisiert in hexagonal dichter Packung mit den Achsen a = 3,557 und c = 5,620.
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    Zeitschrift für anorganische Chemie 242 (1939), S. 369-374 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 242 (1939), S. 413-426 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 243 (1939), S. 32-38 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Durch Funkenzerstäubung von Gold in ozonhaltigem Sauerstoff wurde ein braunschwarzes Oxydationsprodukt erhalten, das neben elementarem Gold etwa 40% eines Goldoxydes enthält. Beim schnellen Erhitzen wird bei 150° Ozonentwicklung festgestellt. Das Goldoxyd ist elektronenamorph.
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    Zeitschrift für anorganische Chemie 243 (1939), S. 69-85 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es wurden die Angaben über die Verbindung der Alkalimetalle zueinander nachgeprüft, wobei auch röntgenographische Methoden benutzt wurden. Erstmalig untersucht wurden die Systeme Lithium/Rubidium und Lithium/Cäsium.
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    Zeitschrift für anorganische Chemie 243 (1939), S. 113-126 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 241 (1939), S. 115-133 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: Nach ROSENHEIm und REIHLEN lassen sich gewisse Plato- und Palladokomplexe in optisch aktive Komponenten spalten. Es wurde aber in dieser Arbeit gezeigt, daß ihre Versuchsergebnisse in anderer Weise zu deuten sind.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 324-337 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 240 (1939), S. 289-299 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Diethermische, mikroskopische und röntgenographische Untersuchung des Systems Gold-Gallium führte zur Auffindung folgender Phasen:α-Phase. Feste Lösung von Ga in Au, schmales Kristallisationsgebiet. Sättigungsgrenze 26,1 Atom-% Ga bei 352°, Abnahme der Löslichkeit mit sinkender Temperatur (15,8 Atom-% Ga bei 200°, etwa 10 Atom-% Ga bei Zimmertemperatur). Gitterkonstanten der Legierungen der α-Phase von der Gitterkonstante des Au nur wenig verschieden, also praktisch keine Gitterdehnung.β-Phase. Peritektische Bildung bei 352°, Verengung des Homogenitätsgebietes mit sinkender Temperatur, eutektoider Zerfall in α und γ bei 275° und 26,5 Atom-% Ga.
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    Zeitschrift für anorganische Chemie 242 (1939), S. 117-127 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Nach genauer Festlegung der Darstellungsbedingungen für das Calcium-Monosilicid, gelang es, diese Verbindung in bisher nicht erzielter Reinheit darzustellen (98%). Durch Aufnahme von DEBYE-SCHERRER-Diagrammen wurde das Vorhandensein zweier Modifikationen I und II beim Monosilicid festgestellt und die Bedingungen, unter denen deren Entstehung und gegenseitige Umwandlung erfolgen, ermittelt.
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    Notes: Es wird ein neues Verfahren zur Dampfdruckmessung entwickelt, das auf einige 1/10 bis 1 mm Hg genau arbeitet und bei hohen Temperaturen Stoffe zu untersuchen erlaubt, die Quarz, Porzellan und dgl. stark angreifen.
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    Zeitschrift für anorganische Chemie 242 (1939), S. 201-214 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: Röntgenographisch konnte zwischen K2O2 und KO2 bisher keine neue Phase gefunden werden; dagegen lassen sich beim Rubidium und Cäsium Peroxyde mittlerer Zusammensetzung durch eigene Röntgendiagramme eindeutig erkennen.
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    Zeitschrift für anorganische Chemie 242 (1939), S. 229-232 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 242 (1939), S. 272-276 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: 1. Das von O. RUFF und G. MILTSCHITZKY ausgearbeitete Verfahren zur Darstellung des COF wird vereinfacht; es gestattet nun in bequemer Weise beliebige Mengen COF2 herzustellen.
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    Zeitschrift für anorganische Chemie 243 (1939), S. 17-31 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: 1. Aus 16 Einzelisothermen für die Aufkohlung verschiedener Eisen-Manganmischungen durch Methan wurde die Raumisotherme 800° des ternären Systems Mn—Fe—C konstruiert.
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    Zeitschrift für anorganische Chemie 243 (1939), S. 110-111 
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    Zeitschrift für anorganische Chemie 243 (1939), S. 145-163 
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    Zeitschrift für anorganische Chemie 240 (1939) 
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    Zeitschrift für anorganische Chemie 240 (1939), S. 322-330 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: Die Aufnahme und Oxydation von Kohlenoxyd in ammoniakalischen Kupfersalzlösungen läßt sich, wenn man von Kupfer-II-hydroxyd bzw. Kupfer-II-karbonat ausgeht, bis zur laufenden Abscheidung von festem Ammonkarbonat(1) entwickeln. Die hier beschriebenen Untersuchungen hatten daz Ziel, den zusätzlichen Einfluß eines oxydierenden Anions der Kupfer-II-verbindungen auf die Kohlenoxydaufnahme zu bestimmen. Kohlenoxyd wirkte bei Zimmertemperatur und gewöhnlichem Druck auf ammoniakalische Lösungen von Kupferchromaten ein.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 1-38 
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    Zeitschrift für anorganische Chemie 241 (1939), S. 93-96 
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    Zeitschrift für anorganische Chemie 241 (1939), S. 76-92 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: In Abb. 2 sind die 20- und 100°-Isothermen des Systems ZnO-Na2O-H2O für die NaOH-Normalitäten 1-21 gezeichnet, außerdem die 30- und 40°-Isothermen für 13-20 n. Bei 20° treten als stabile Bodenkörper auf: 1ZnO zwischen 1 und 13,4 n (A-R),2[Zn(OH)3]Na zwischen 13,5 und 19,6 n (R-G),3[Zn(OH)4]Na2 etwa zwischen 19,7 und 20,1 n (G-H),4Gemisch [Zn(OH)4]Na2 und NaOH·H2O jenseits 20,1 n.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 134-144 
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    Zeitschrift für anorganische Chemie 241 (1939), S. 338-348 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: 1. Die Umsetzung des Quarzes führt in den quaternären Alk2IO-Alk2IIO—SiO2—CO2-Systemen zu denselben Reaktionsdrucken wie in den ternären Alk2O—SiO2—CO2-Systemen. Infolge der besseren Diffusionsmöglichkeit werden auch die Anfangsdrucke der instabilen Metasilikatbildung nach [Alk2 · CO3] + [SiO2] = Alk2SiO3 (feste Lösung) + (CO2) beobachtet. Ein stabiles Gleichgewicht zwischen Quarz und Disilikat liegt auch im quaternären System nicht vor.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 349-360 
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    Zeitschrift für anorganische Chemie 241 (1939), S. 381-394 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: 1. HF greift nicht an, wenigstens bis 1200°, Cu; bis 800°, Cu2O und Cu2S; bis 850° SgCl.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 421-423 
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    Zeitschrift für anorganische Chemie 241 (1939), S. 209-224 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: Beim Zerfall der Ammoniumchromate verarmt die Oberfläche wahrend der Einstellperiode an Ammoniak. Dieser Vorgang führt nicht zu einer Übersättigung, die den weiteren Ablauf des Zerfalls hemmen wurde, da ja kein Gleichgewicht zwischen den Reaktionsprodukten und dem Ausgangsmaterial besteht. In der aufgelockerten Oberfläche tritt die Oxydation der Kationen durch die Anionen ein, und diese Reaktion pflanzt sich nach einem einfachen Zeitgesetz durch den Rest des Kristalls fort. Dabei hat sich herausgestellt, daß die amorphen Reaktionsprodukte den weiteren Zerfall katalytisch beschleunigen.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 304-304 
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    Zeitschrift für anorganische Chemie 242 (1939), S. 281-301 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: 1. Es wurden Hydrate und Alkalifluorid-Komplexsalze des Rhodiumfluorids dargestellt.
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    Zeitschrift für anorganische Chemie 242 (1939), S. 233-236 
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    Zeitschrift für anorganische Chemie 241 (1939), S. 259-263 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: 1. Es wurden das Sulfid, das Selenid und das Tellurid des zweiwertigen Europiums hergestellt.
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    Zeitschrift für anorganische Chemie 240 (1939), S. 117-128 
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    Zeitschrift für anorganische Chemie 242 (1939), S. 47-48 
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    Zeitschrift für anorganische Chemie 242 (1939), S. 87-91 
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    Zeitschrift für anorganische Chemie 240 (1939), S. 209-216 
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    Topics: Chemistry and Pharmacology
    Notes: 1. Es werden zwei verschiedene Typen von Kieselsäure-Aggregaten unterschieden: Aus den verdünnten sauren Ultrafiltraten, wo die zugesetzte Säure auf die Kieselsäure „stabilisierend“ wirkt, fallen Aggregate aus, die Fibrillarstrukturen besitzen. Aus den übrigen Ultrafiltraten fällt die Kieselsäure flockig aus.
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    Zeitschrift für anorganische Chemie 240 (1939), S. 300-312 
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    Zeitschrift für anorganische Chemie 240 (1939), S. 355-368 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: 1. Es wurde das magnetische Verhalten von Sauerstoffverbindungen des sechswertigen Chroms, Molybdäns, Wolframs und Urans untersucht.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 42-56 
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    Topics: Chemistry and Pharmacology
    Notes: Die Darstellung von duktilem Titan durch thermische Zersetzung von Titanjodid an einem glühenden Draht wird in ihren Einzelheiten beschrieben, ebenso die Bereitung des hierzu benötigten Titanrohmetalls. Der Kerndraht, an dem die Zersetzung des Jodids erfolgt, wird auf eine Temperatur von mindestens 1100° C erhitzt. Die äußere Form der Titanstäbe ist von dieser Temperatur abhängig und gleichzeitig von der Struktur des verwendeten Kerndrahtes (vgl. Ahb. 2). Der Kerndraht befand sich bei den Versuchen in einem Pyrexglasgefäß mit dicken eingeschmolzenen Wolframelektroden, in welchem sich gleichzeitig die erforderliche Menge Rohmetall und eine verhältnismäßig kleine Menge Jod befanden. Dieses Gefäß wird während des Präparierens auf eine geeignete Temperatur erhitzt. Die beim Präparierens auftretenden Erscheinungen werden zu einem wesentlichen Teil durch die Beschaffenheit des Titanrohmetalls bestimmt. Wird von Titanrohmetall in Form einiger Zentimeter großer, poröser Blöcke ausgegangen, wie sie bei der Reduktion von Titantetrachlorid mit Natrium unter bestimmten Umständen erhalten werden können, so findet nicht bei jeder beliebigen hohen Temperatur des Pyrexglaspräpariergefäßes ein Anwachsen des auf eine geeignete Temperatur erhitzten Kerndrahtes statt. Es treten dann jedoch zwei Temperaturgebiete auf, in denen das Präparieren möglich ist: nämlich zwischen 50 und 250°C sowie oberhalb 470° C, während im Zwischengebiet kein Wachsen des Kerndrahtes stattfindet (vgl. Abb. 3). Ist das Präpariergefäß einmal auf eine Temperatur von z. B. 400° C oder höher erhitzt gewesen, so ist das Präparieren bei jeder Temperatur unterhalb 470°C unmöglich. Die Ursache dieser Erscheinungen ist die zwischen TiJ4 und dem Überschuß von Titanrohmetall oberhalb 100° C auftretende Reaktion, bei welcher niedrigeres Jodid gebildet wird. Im niedrigen Temperaturgebiet besteht die Gasphase aus TiJ4, im hohen enthält sie TiJ4 und TiJ2.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 97-106 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Die sogenannten Tetroxyde des Kaliums, Rubidiums und Cäsiums kristallisieren tetragonal im CaC2-Typ mit folgenden Gitterkonstanten: TextKO2RbO2CsO4a5,706,006,28c6,757,037,24
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    Zeitschrift für anorganische Chemie 242 (1939), S. 406-412 
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    Topics: Chemistry and Pharmacology
    Notes: 1. Es wurde eine Analysenmethode für F2-Gas auf O2, entwickelt.
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    Zeitschrift für anorganische Chemie 242 (1939), S. 393-405 
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    Zeitschrift für anorganische Chemie 240 (1939) 
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    Zeitschrift für anorganische Chemie 240 (1939), S. 139-141 
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    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Eine neue Deutung der von TRZEBIATOWSKI und BRYJAK angegebenen intermediären kubischen Phase im System As—Sb wird vorgeschlagen, nämlich die, daß diese Phase aus Mischkristallen As2O3 und Sb2O3 besteht. Für diese Deutung sprechen einmal die von den erwähnten Verfassern selbst angegebenen Umstände bei der Entstehung der Phase und ferner die Tatsache, daß die Gitterdimensionen derselben und die Linienintensitäten des Rötgendiagrammes sich an die für As2O3 und Sb2O3 bekannten gut anschließen.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 145-157 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Die Reduktion des Nickelsulfides durch Wasserstoff ist umkehrbar. Bei 600° führt sie zu γ-Mischkristallen. Bei 400 und 500° wurden die durch bestimmte H2S/H2-Verhältnisse gekennzeichneten heterogenen Gleichgewichte NiS—Ni6S6, und Ni6S4,9—Ni3S2 beobachtet. Die weitere Reduktion führt zu Mischkristallen, welche sich schließlich trotz beträchtlichen Schwefelgehaltes nicht weiter entschwefeln lassen.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 196-204 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
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    Zeitschrift für anorganische Chemie 240 (1939), S. 284-288 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 240 (1939), S. 273-283 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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    Zeitschrift für anorganische Chemie 240 (1939), S. 337-354 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 39-41 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 89
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es werden einige Verbesserungen an der Apparatur zur Messung von Siedepunktserhöhungen in wasserfreier Flußsäure be-schrieben.
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    Zeitschrift für anorganische Chemie 243 (1939), S. 99-109 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In der vorliegenden Arbeit wird eine Methode beschrieben, Substanzen mit hohem Gehalt an wasserfreiem Aluminiumperchlorat herzustellen. Das Verhalten dieser Produkte zu verschiedenen organischen Lösungsmitteln wurde festgestellt.
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    Zeitschrift für anorganische Chemie 242 (1939), S. 215-221 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Strontium-Hydroxylapatit entsteht (in verunreinigter Form) durch Hydrolyse von sekundärem Strontiumphosphat mit n/10 NaOH oder mjt Phosphat-Pufferlösung (pH = 11,0). Ferner bildet er sich bei der Fällung von Strontiumsalzlösungen mit alkalischen Phosphatlösungen. Rein läßt er sich darstellen durch Erhitzen von tertiärem Strontiumphosphat mit Strontiumkarbonat im Wasserdampfstrom bei 1150°. Bezüglich der Bildungsbedingungen sowie der röntgenographisch bestimmten Gitterkonstanten reiht sich der Strontium-Hydroxylapatit entsprechend der Stellung des Strontiums im periodischen System der Elemente zwischen die schon bekannten Hydroxylapatite des Kalziums und Bariums (und des Bleis) ein. Tertiäres Strontiumphosphat bildet sich nicht in wäßrigem Medium.
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    Zeitschrift für anorganische Chemie 243 (1939), S. 164-173 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 241 (1939), S. 372-380 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Natriumstannat, das aus seinen wäßrigen Lösungen mit konzentrierter Natronlauge ausgefällt wird, enthält stets noch geringe Mengen von Natriumhydroxyd, die auch durch sorgfältiges Auswaschen nicht restlos entfernt werden können. Dieser Gehalt an Natriumhydroxyd bewirkt, daß das feste Salz gegen die Kohlensäure der Luft sehr empfindlich ist. Im übrigen ist Natriumstannat eine durchaus beständige Verbindung.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 418-420 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 241 (1939), S. 165-171 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Im Verlaufe einer Untersuchung über die Analogien des Fluoberyllat-Ions mit dem Sulfat-Ion wurden die folgenden Metallammin -Komplexe dargestellt: [Ag(NH3)2]2BeF4· 2H2O; [Ag(NH3)2]2BeF4; [Cu(NH3)4]BeF4·H2O;[Cu(NH3)2]BeF4;[Zn(NH3)4]BeF4;[Cd(NH3)4BeF4]; [Ni(NH3)4]BeF4; [Ni(NH3)4]BeF4· 2H2O; [Ni(NH3)4]BeF4; [Ni(NH3)4]BeF4·2KJ; [Co(NH3)6]2(BeF4)3· 3H2O; [Co(NH3)6]ClBeF4. Diese Verbindungen sind den entsprechenden Verbindungen, die an Stelle des BeF4,-Radikals das SO4-Radikal enthalten, analog.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 172-178 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Durch Erhitzen von CuF2 im Ammnoniakstrom auf 280° wurde analysenreines Cu3N erhalten.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 205-208 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es werden eine Anzahl Chinolinverbindungen der Zinksalze dargestellt, nämlich: Zinknitratdichinolin, Zinkpropionatchinolin, Zinkbenzoatchinolin, Dizinksulfatchinolin, Dizinkformiatchinolin, Dizink(n-)butyratchinolin, Dizink(n-)valeriatchinolin und Dizink(n-capronatchinolin.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 239-258 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Durch DEBYE-SCHERRER-Aufnahmen konnten folgende Strukturen ermittelt werden: Europiumdifluorid besitzt Fluoritstruktur, Kalziumbromid hat Kalziumchloridstruktur. Im Bleichlorid-Typ kristallisieren: Bariumchlorid, -bromid, -jodid, Samarium- und Europiumdichlorid. Ytterbiumdijodid besitzt Kadmiumjodidstruktur, Ytterbiumdichlorid möglicherweise eine verzerrte Flußspatstruktur.
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    Zeitschrift für anorganische Chemie 241 (1939), S. 281-304 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es wird die Darstellung der Monosulfide, Selenide und Telluride vou Natrium, Kalium, Rubidium und Cäsium beschrieben.
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    Zeitschrift für anorganische Chemie 240 (1939), S. 145-149 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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