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  • Inorganic Chemistry  (3,366)
  • Cell & Developmental Biology
  • Humans
  • 2020-2024  (8)
  • 1935-1939  (3,946)
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  • 1
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    Unknown
    Frontiers Media SA
    Publication Date: 2024-03-31
    Description: Echolocation has evolved in different groups of animals, from bats and cetaceans to birds and humans, and enables localization and tracking of objects in a dynamic environment, where light levels may be very low or absent. Nature has shaped echolocation, an active sense that engages audiomotor feedback systems, which operates in diverse environments and situations. Echolocation production and perception vary across species, and signals are often adapted to the environment and task. In the last several decades, researchers have been studying the echolocation behavior of animals, both in the air and underwater, using different methodologies and perspectives. The result of these studies has led to rich knowledge on sound production mechanisms, directionality of the sound beam, signal design, echo reception and perception. Active control over echolocation signal production and the mechanisms for echo processing ultimately provide animals with an echoic scene or image of their surroundings. Sonar signal features directly influence the information available for the echolocating animal to perceive images of its environment. In many echolocating animals, the information processed through echoes elicits a reaction in motor systems, including adjustments in subsequent echolocation signals. We are interested in understanding how echolocating animals deal with different environments (e.g. clutter, light levels), tasks, distance to targets or objects, different prey types or other food sources, presence of conspecifics or certain predators, ambient and anthropogenic noise. In recent years, some researchers have presented new data on the origins of echolocation, which can provide a hint of its evolution. Theoreticians have addressed several issues that bear on echolocation systems, such as frequency or time resolution, target localization and beam-forming mechanisms. In this Research Topic we compiled recent work that elucidates how echolocation – from sound production, through echolocation signals to perception- has been shaped by nature functioning in different environments and situations. We strongly encouraged comparative approaches that would deepen our understanding of the processes comprising this active sense.
    Keywords: QP1-981 ; Q1-390 ; bats ; Biosonar ; Humans ; marine mammals ; sensory biology ; Birds ; Behavior ; Communication ; thema EDItEUR::M Medicine and Nursing::MF Pre-clinical medicine: basic sciences::MFG Physiology
    Language: English
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  • 2
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    Frontiers Media SA
    Publication Date: 2024-04-04
    Description: The Frontiers in Chemistry Editorial Office team are delighted to present the inaugural “Frontiers in Chemistry: Rising Stars” article collection, showcasing the high-quality work of internationally recognized researchers in the early stages of their independent careers. All Rising Star researchers featured within this collection were individually nominated by the Journal’s Chief Editors in recognition of their potential to influence the future directions in their respective fields. The work presented here highlights the diversity of research performed across the entire breadth of the chemical sciences, and presents advances in theory, experiment and methodology with applications to compelling problems. This Editorial features the corresponding author(s) of each paper published within this important collection, ordered by section alphabetically, highlighting them as the great researchers of the future. The Frontiers in Chemistry Editorial Office team would like to thank each researcher who contributed their work to this collection. We would also like to personally thank our Chief Editors for their exemplary leadership of this article collection; their strong support and passion for this important, community-driven collection has ensured its success and global impact.
    Keywords: Green and Sustainable Chemistry ; Analytical Chemistry ; Theoretical and Computational Chemistry ; Polymer Chemistry ; Medicinal and Pharmaceutical Chemistry ; Organic Chemistry ; Nanoscience ; Catalysis and Photocatalysis ; Supramolecular Chemistry ; Electrochemistry ; Inorganic Chemistry ; Chemical Biology ; thema EDItEUR::P Mathematics and Science::PD Science: general issues
    Language: English
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  • 3
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    Frontiers Media SA
    Publication Date: 2024-03-30
    Description: In the ancient past, cocoa has been appreciated as a high-calorie food to boost energy in soldiers and for its undefined medicinal and mystical properties. During other times, chocolate has been considered as the forbidden “food of God”: a treasure of pleasure for the mind and the soul. The overall perception of the consumer for chocolate was of a “charming” and appealing food with lots of negative aspects related to high sugar content leading to consider chocolate as “junk food” for its “obesigen” calories. Recently, in association with the renewed interest of nutrition science in alternative source of health-promoting foods and ingredients, a large body of research has been conducted to unravel the pro and cons of cocoa in relation to human health. Epidemiological evidences indicate that cocoa consumption helps preventing cardiovascular disease for its high content in bioactive flavonoids. Clinical trials show that chocolate consumption might improve vascular function, decreasing platelet aggregation and display an antioxidant and anti-inflammatory effect. The putative protective action of cocoa seems to be multi-factorial and involving different aspects of vascular, antioxidant and endothelial function. However, the mechanism(s) that account for the benefits of cocoa it is still unclear. The aim of this Research Topic is therefore to provide the reader with an objective picture of the state of art on the association between cocoa and health, mainly through the evidences of human trials; overwhelmingly considered the golden standard for nutritional science. The Research Topic will cover the analysis of the manufacturing processes of the chocolate and the antioxidant effects in humans as well as the majority of the putative health effects of chocolate and cocoa, such as anti-inflammatory properties, effect on immunity, platelet aggregation, blood pressure, endothelial function and cognitive behavior. Unraveling the functional properties of cocoa will help to understand if the 'food of God' is a primordial gift for the health of mankind.
    Keywords: R5-920 ; RC581-607 ; TX341-641 ; Antioxidants ; Obesity ; Flavonoids ; Humans ; Chocolate ; Blood pressure ; Inflammation ; Cognitive function ; Cocoa ; Immunity
    Language: English
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  • 4
    Publication Date: 2024-04-05
    Description: This eBook comprises s series of original research and review articles dealing with the anatomical, genetic, and physiological organization of the auditory system from humans to monkeys and mice.
    Keywords: RC321-571 ; Q1-390 ; audition ; monkeys ; gens ; translational ; Humans ; Rodents ; Memory ; Perception ; Physiology ; functional imaging ; Anatomy ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences::PSA Life sciences: general issues::PSAN Neurosciences
    Language: English
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  • 5
    Publication Date: 2024-04-05
    Description: The global population aged over 60 is set to rise dramatically in the coming decades. In many countries, the older population now faces the prospect of spending a quarter of their lives aged over 65, and a significant proportion will have to cope with cognitive decline associated with normal ageing or with dementia disorders. Given that these fundamental demographic changes will pose a significant challenge to health care systems, a detailed understanding of age-related cognitive and neurobiological changes is essential in helping elderly populations maintain cognitive performance. In addition, developing sensitive biomarkers to identify those at risk of developing dementia is crucial for early and effective interventions. To make inferences about the ageing process from the animal model back to the human, rigorous behavioral paradigms must be used to ensure that the same function is being examined across species. Given that similar navigational paradigms can easily be applied to humans and animals, recent years have seen an expansion of studies attempting to bridge the gap between age-related changes in animal and human spatial cognition. These studies begin to suggest that disruptions in spatial computations are among the earliest indicators of impending cognitive decline. In addition, although many animal studies have identified pathological mechanisms with paradigms involving spatial navigation, these mechanisms support many nonspatial cognitive functions as well. As a consequence, a successful characterization of how spatial processing changes in the ageing brain could reveal fundamental effects of cognitive ageing that could inform about general mechanisms underlying decline in perception, mnemonic processing and multisensory integration.
    Keywords: RC321-571 ; Q1-390 ; Neuroscience ; spatial navigation ; Humans ; Aging ; Animal Models ; Dementia ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences::PSA Life sciences: general issues::PSAN Neurosciences
    Language: English
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  • 6
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    White Rose University Press | White Rose University Press
    Publication Date: 2022-12-06
    Description: In Hidden Depths, Professor Penny Spikins explores how our emotional connections have shaped human ancestry. Focusing on three key transitions in human origins, Professor Spikins explains how the emotional capacities of our early ancestors evolved in response to ecological changes, much like similar changes in other social mammals. For each transition, dedicated chapters examine evolutionary pressures, responses in changes in human emotional capacities and the archaeological evidence for human social behaviours. Starting from our earliest origins, in Part One, Professor Spikins explores how after two million years ago, movement of human ancestors into a new ecological niche drove new types of collaboration, including care for vulnerable members of the group. Emotional adaptations lead to cognitive changes, as new connections based on compassion, generosity, trust and inclusion also changed our relationship to material things. Part Two explores a later key transition in human emotional capacities occurring after 300,000 years ago. At this time changes in social tolerance allowed ancestors of our own species to further reach out beyond their local group and care about distant allies, making human communities resilient to environmental changes. An increasingly close relationship to animals, and even to cherished possessions, appeared at this time, and can be explained through new human vulnerabilities and ways of seeking comfort and belonging. Lastly, Part Three focuses on the contrasts in emotional dispositions arising between ourselves and our close cousins, the Neanderthals. Neanderthals are revealed as equally caring yet emotionally different humans, who might, if things had been different, have been in our place today. This new narrative breaks away from traditional views of human evolution as exceptional or as a linear progression towards a more perfect form. Instead, our evolutionary history is situated within similar processes occurring in other mammals, and explained as one in which emotions, rather than ‘intellect’, were key to our evolutionary journey. Moreover, changes in emotional capacities and dispositions are seen as part of differing pathways each bringing strengths, weaknesses and compromises. These hidden depths provide an explanation for many of the emotional sensitivities and vulnerabilities which continue to influence our world today.
    Keywords: Human demography ; Group size ; Lithic transfers ; Raw material movements ; Bonobos ; Dog burial ; Comfort ; Symbolic objects ; Symbolism ; Mobiliary art ; Attachment fluidity ; Hypersociability ; Human-animal relationships ; Dog domestication ; Attachment object ; Approachability ; Approach behaviour ; Avoidance behaviour ; Androgens ; Physiological responses ; Cognitive Archaeology ; Autism Spectrum Condition ; Handaxe ; Biface ; Neurodiversity ; Palaeolithic stone tools ; Evolution of neurodiversity ; Rock art ; Ice age art ; Material Culture ; Cultural transmission ; Emotional commitment ; Biopsychosocial approach ; Social tolerance ; Attachment ; Genus Homo ; Acheulian ; Cultural evolution ; Skeletal abnormality ; Injury ; Illness ; Interdependence ; Emotional sensitivity ; Moral emotions ; Evolution of Altruism ; Hominins ; Upper Palaeolithic ; Lower Palaeolithic ; Ecological niche ; Selective pressure ; Behavioural ecology ; Wolves ; Affective empathy ; Cognitive empathy ; Theory of mind ; Human Cognition ; Vulnerability ; Evolutionary Psychology ; Developmental psychology ; Helping behaviours ; Social cognition ; Social mammals ; Human Emotion ; Human social collaboration ; Generosity ; Emotional brain ; Social emotions ; Comparative behaviour ; Evolution ; Social carnivores ; Primate behavioural ecology ; Primate social systems ; Human Evolution ; Human ancestors ; Collaboration ; Evolutionary Biology ; Emotional vulnerability ; Social connection ; Decolonisation ; Social networks ; Middle Palaeolithic ; Community resilience ; Convergent evolution ; Chimpanzee ; Origin of modern humans ; Social safeness ; Wolf domestication ; Cherished possessions ; Compensatory attachment ; Loneliness ; Palaeolithic art ; Stress reactivity ; Bonding hormones ; Humans ; Hunter-gatherers ; Intergroup collaboration ; Tolerance ; Emotional connection ; Autism ; Trust ; Early Prehistory ; Palaeopathology ; Origins of healthcare ; Human self-domestication ; Palaeolithic Archaeology ; Social brain ; Care-giving ; Empathy ; Neanderthals ; Compassion ; Social Connection ; Evolution of Emotions ; Human Origins ; Adaptation ; Prehistory ; bic Book Industry Communication::J Society & social sciences::JH Sociology & anthropology::JHM Anthropology ; bic Book Industry Communication::H Humanities::HD Archaeology ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences::PSA Life sciences: general issues::PSAF Ecological science, the Biosphere ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences::PSA Life sciences: general issues::PSAJ Evolution ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPW Political activism::JPWQ Revolutionary groups & movements ; bic Book Industry Communication::J Society & social sciences::JM Psychology
    Language: English
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  • 7
    Publication Date: 2024-04-04
    Description: This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact
    Keywords: drugs ; Behavior ; Memory tasks ; pre-clinical ; clinical ; Humans ; Animals ; thema EDItEUR::P Mathematics and Science::PD Science: general issues ; thema EDItEUR::M Medicine and Nursing::MK Medical specialties, branches of medicine::MKG Pharmacology
    Language: English
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  • 8
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    De Gruyter | De Gruyter Open Poland
    Publication Date: 2022-11-22
    Description: This edited volume examines the opportunities to think, do, and/or create jointly afforded by digital storytelling. The contributors discuss digital storytelling in the context of educational programs, teaching anthropology, and ethnographic research involving a variety of populations and subjects that will appeal to researchers and practitioners engaged with qualitative methods and pedagogies that rely on media technology.
    Keywords: Discourse ; Climate Change ; Humans ; Nature ; Oceania ; Resilience ; Environmental Ethics ; Environmental Change ; Worldview ; bic Book Industry Communication::J Society & social sciences::JF Society & culture: general::JFF Social issues & processes::JFFC Social impact of disasters ; bic Book Industry Communication::J Society & social sciences::JF Society & culture: general::JFH Popular beliefs & controversial knowledge::JFHF Folklore, myths & legends ; bic Book Industry Communication::J Society & social sciences::JF Society & culture: general::JFS Social groups::JFSL Ethnic studies::JFSL9 Indigenous peoples ; bic Book Industry Communication::J Society & social sciences::JH Sociology & anthropology::JHB Sociology::JHBD Population & demography ; bic Book Industry Communication::J Society & social sciences::JH Sociology & anthropology::JHM Anthropology ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences::PSX Human biology::PSXM Medical anthropology
    Language: English
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 223 (1935), S. 217-221 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Tab.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 223 (1935), S. 213-216 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 11
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 223 (1935), S. 234-240 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Beim Schmelzen Cu-haltiger Stoffe mit Soda und Schwefel und Ausziehen der Schmelze mit Wasser können beträchtliche Mengen Cu mit in die Sulfosalzlösung gehen, besonders bei Gegenwart von viel Sn. Das gelöste Cu läßt sich aus der Sulfosalzlösung durch Zusätze von NaOH, Na2S und Na2SO3 oder weniger gut KCN zum größeren Teil wiederabscheiden, doch bleibt ein von Art und Menge der Begleitmetalle abhängiger Rest Cu in Lösung. Zuverlässiger ist die Trennung des gelösten Cu von As, Sb und Sn durch Wiederausfällung der Sulfide mit Säure und anschließende Behandlung mit einem Gemisch von NaOH, Na2S und Na2SO3. Aber auch diese Trennung ist nur auf ½-1 mg genau, da immer etwas Cu mit in Lösung geht.
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  • 12
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 223 (1935), S. 321-361 
    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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  • 13
    Electronic Resource
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 223 (1935), S. 382-386 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 14
    Electronic Resource
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 223 (1935), S. 393-396 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 15
    Electronic Resource
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 223 (1935), S. 397-398 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 16
    Electronic Resource
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 223 (1935), S. 399-408 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Reaktion zwischen den Wismuthalogeniden und Ammoniak tritt eine Ammonolyse nicht ein, vielmehr erhält man eine Reihe von Ammoniakadditionsverbindungen, die nach ihrem chemischen und physikalischen Verhalten in Anlagerungs- und Einlagerungsverbindungen unterteilt werden.
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  • 17
    Electronic Resource
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 224 (1935), S. 27-28 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 18
    Electronic Resource
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 224 (1935), S. 23-24 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Weder durch Anbau von Wasserdampf an Orthoborsäure noch beim Abbau gesättigter Borsäurelösung konnte bei O° ein höheres Borsäurehydrat in festem Zustand gefaßt werden.
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  • 19
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 224 (1935), S. 29-32 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 20
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 223 (1935), S. 251-252 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
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  • 21
    Electronic Resource
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 224 (1935), S. 253-256 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Tab.
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  • 22
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 223 (1935), S. 417-421 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Folgende Verbindungen werden rein hergestellt und beschrieben: .
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  • 23
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 223 (1935), S. 422-426 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurde untersucht, ob die Behandlung von Calciumphosphaten mit H2O und CO2 unter Druck bei Raumtemperatur bzw. 120 oder 170° C zu einer Erhöhung des Gehalts an citratlöslicher Phosphorsäure führt. Innerhalb der angewandten Bedingungen ist ein solcher Einfluß nur in sehr geringem Umfang vorhanden; auch Zusätze von K- bzw. NH4-Salzen sind fast unwirksam
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  • 24
    Electronic Resource
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 224 (1935), S. 420-426 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Titantertachlorid mischt sich mit Brom in jedem Verhältnis.
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  • 25
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 225 (1935), S. 64-68 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird die Gewinnung vollkommen reinen Tantalmaterials aus Tantalit beschrieben.
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  • 26
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 224 (1935), S. 107-112 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 27
    Electronic Resource
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 224 (1935) 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 28
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 224 (1935), S. 130-152 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Absorption von Kohlenoxyd in Cupritetramminsalzlösungen, z. B. Cupritetramminhydroxyd, -carbonat, -chlorid, -sulfat wird durch die Gegenwart metallischen Kupfers außerordentlich beschleunigt.
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  • 29
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 225 (1935), S. 69-72 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Der isotherme Abbau von Tonsubstanz (Zettlitzer Kaolin) zeigte, daß das Molekül nicht die allgemein angenommene Zusammensetzung Al2O3·2SiO2·2H2O hat, sondern [Al2O3·2SiO2]·3H2O bzw. Al2O3·2SiO2·1,5H2O; 0,5 Mol H2 sind im lufttrockenen Material absorbiert. Die Entwässerung erfolgt stufenweise vom 1,5- über das 1- und O,5-Hydrat zum wasserfreien Al2O3·2SiO2(Metakaolin).
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  • 30
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 224 (1935), S. 257-264 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Mixter'sche Natriumsuperoxydmethode wird durchgearbeitet; es wird gezeigt, welche Fehlerquellen frühere Forscher vernachlässigt haben. Alle nach dieser Methode gefundenen Bildungswärmen von Oxyden sind unsicher, wie am Fall des Zinkoxydes experimentell gezeigt wird.  -  Die Bildungswärme von regulärer Zinkblende (d4¨23¨ = 4,088) wird zu + 41,5 ± 1,5 kcal bestimmt.
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  • 31
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 225 (1935), S. 213-216 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No Abstracts.
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  • 32
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 225 (1935), S. 254-257 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No Abstracts.
    Additional Material: 8 Ill.
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  • 33
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 224 (1935), S. 337-350 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Auf Grund der angeführten Versuche kann man mit voller Sicherheit behaupten, daß die Gewinnung kompakter Kathodenniederschläge aus NiCl2-Lösungen (ohne Zugabe irgendwelcher Substanzen) keine Schwierigkeiten bietet.
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    Zeitschrift für anorganische Chemie 224 (1935), S. 388-398 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es hat sich herausgestellt, daß Magnesium mit Lithium drei Phasen fester Lösungen bildet, nicht zwei, wie es von den früheren Forschern angenommen wurde.
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    Zeitschrift für anorganische Chemie 225 (1935), S. 24-28 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Versuche über die Inversion von Rohrzuckerlösungen durch HCl und H2SO4 im tropischen Sonnenlicht führen zu dem Ergebnis, daß das Licht allein die Inversion bewirkt; die Inversion wird erhöht bei Zusatz von Katalysatoren, so daß Katalysator und Belichtung einander unterstützen. Hierdurch werden DHAR'S Untersuchungen über den Einfluß des tropischen Sonnenlichtes auf die Inversion von Zuckerlösungen bestätigt.
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No Abstracts.
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    Zeitschrift für anorganische Chemie 225 (1935), S. 369-385 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No Abstracts.
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    Zeitschrift für anorganische Chemie 226 (1935), S. 21-22 
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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 226 (1935), S. 23-32 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reines Chrom läßt sich durch Reduktion des wasserfreien Chlorids oder des reinen Oxyds (aus CrO33) gewinnen. Man kann dabei entweder die Druckreduktion in der Bombe anwenden, wobei die Chromverbindung mit, zweimal destilliertem Calcium in Form von Preßlingen zur Umsetzung gebracht wird. Hierbei entstehen Metallkörner bis zu Bohnengröße, die in allen Fällen warm schmiedbar sind. Diese Körner lassen aber die weitere Verarbeitung auf regelmäßig geformte Walzkörper nicht zu, weil sie sich nicht, brikettierrn lassen. Nimmt man die Reduktion mit Calcium, nach dem Vorschlag von Marden in Salzschmelzen, beispielsweise Calciumchlorid, vor, so findet keine Drucksteigerung statt, und man erhält brikettierbares Pulver. Man kann entweder in einer leichten, geschlossenen Bombe an der Luft erhitzen (nach MANDEN), wobei die Bombe den Luftabschluß besorgt. Besser aber verfährt man nach dem oben beschriebenen Verfahren, wonach die Reduktion des Chromoxyds mit Ca innerhalb einer Ba-Chlorid-Ca-Chloridschmelze: erfolgt, unter Verwendung eines offenen Tiegels, der durch Hochfrequenz unter Argon erhitzt wird. Das nach Lösen mit salpetersäurehaltigem Wasser gewonnene Pulver wird ein zweites Mal mit Salz und wenig Calcium reduziert, urn restliche Oxyde zu beseitigen. Es 1äßt sich nach dem Pressen bei 1300° im Hochvakuum entgasen, und wird unter geringem Argondruck bei 1600-1700° dicht, gesintert. Dei Sinterkörper ist bei 1250° walzbar. Man erhitzt ihn in einer Chlorbariumschmelze unter Benützung eines Nichrormtiegels. Das gewalzte Cr ist bei Zimmertemperatur spröde, und wird bei mäßiger Erhitzung verformbar. Es hat die Brinellhärte von etwa 150 im angelassenen Zustand. Die große Flüchtigkeit im Hochvakuum und die starke Angreifbarkeit durch die meisten Säuren, mit, Ausnahme von Salpetersäure, lassen vermutlich nür wenige Nutzanwendungen zu.
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    Zeitschrift für anorganische Chemie 226 (1935), S. 92-96 
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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 226 (1936), S. 341-349 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Neuentwicklung und Anwendung kolorimetrischer Methoden ist zu beachten, daß das Absorptionsspektrum eines färbenden Bestandteils durch Solvatationsvorgänge beeinflußt wird.
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    Zeitschrift für anorganische Chemie 226 (1936), S. 350-352 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 226 (1936), S. 425-428 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 226 (1936), S. 192-196 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 226 (1936), S. 222-224 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 226 (1936), S. 257-264 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Entstehungsbedingungen und Eigenschaften des von HARTMANN und BRENTSCHNEIDER beobachteten amorphen metallischen Kathodenproduktes bei der Wolframelektrolyse in Phosphatschmelzen werden näher untersucht.
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    Zeitschrift für anorganische Chemie 226 (1935) 
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    Zeitschrift für anorganische Chemie 226 (1936), S. 370-384 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es werden Versuche ausgeführt, das Dibrommonoxyd in der Gasphase darzustellen und die Gründe diskutiert, die dazu führen, das Oxyd auf diesem Wege nicht in größeren Konzentrationen zu erhalten.
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    Zeitschrift für anorganische Chemie 227 (1936), S. 17-24 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: Es wird die Darstellung reinsten Germaniumtetrachlorids beschrieben.
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    Zeitschrift für anorganische Chemie 227 (1936), S. 1-16 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The system niobium-chlorine has been investigated.The formation of niobiumtrichloride, with a composition range from NBcl2,67 to NbCl3.1, has been studied by thermal decomposition of niobium tetrachloride reduction of NBCl5 with hydrogen, and the chemical transport reaction: \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm NbCl}_{\rm x} {\rm f} + \left( {4 - {\rm x}} \right){\rm NbCl}_{\rm 5} {\rm g} = \left( {5 - {\rm x}} \right){\rm NbCl}_{\rm 4} {\rm g} $$\end{document}.
    Notes: Das Das Niobtrichlorid besitzt einen großen Homogenitätsbereich. Die Phasengrenzen liegen bei den Zusammensetzungen NbCI3,1 und NbCL2,67. Diese Grenzzusammensetzungen fallen schon beim thermischen Abbau des Niobtetrachlorids und bei der Reduktion yon NbCl5 nit H2 auf. Weiteren Aufschluß geben Experimente, bei denen die Trichlorid- phase NbClx durch eine chemische Transportreaktion \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm NbCl}_{\rm x} {\rm f} + \left( {4 - {\rm x}} \right){\rm NbCl}_{\rm 5} {\rm g} = \left( {5 - {\rm x}} \right){\rm NbCl}_{\rm 4} {\rm g} $$\end{document} als Gleichgewichtsbodenkörper gewonnen wird. Die Zusammensetzung der Trichlorid-phase hängt in der zu fordernden Weise vom NbCl5-Druck ab. Aus Pulverdiagrammen und aus der Farbe dcr Trichlorid-Präparate läßt sich ebenfalls die Breite der Trichlorid- phase und auch die Zusammensetzung eines im homogenen Gebiet liegenden Präparats ableiten.Angaben über das Niobtrichlorid hinsichtlich seines thermischen und chemischen Verhaltens werden zusammengestellt.Niob)II(-chlorid wird aus Nb + NbCl2,67 gewonnen. Auch beim Erhitzen von Nb im NbCl5-Argon-Strom und bei der Reduktion von NbCl2 mit H2 ist die NbCl2-Bildung nachweisbar. NbCl2 besitzt keine erhebliche Phasenbreite. Das chemische und thermische Verhalten des NbCl2 werden studiert.Das metallische Niob löst keine nachweisbaren cl-Mengen. Ein Niob(I)-chlorid wurde nicht gefunden.Zusammenfassend werden die Phasenverhältnisse im System Niob-Chlor dargestellt, und weitere Probleme der Trichloridphase erörtert.Das letzte Kapitel bringt Analysenverfahren.
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    Zeitschrift für anorganische Chemie 227 (1936), S. 94-102 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 227 (1936), S. 353-375 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Als Beispiel einer Zerfallsreaktion an einfachen Mehrstoffkatalysatoren wird der Zerfall des Ameisensäuredampfes an Silber-Gold- und Kupfer-Gold-Legierungen nach der statischen Methode untersucht.
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    Zeitschrift für anorganische Chemie 223 (1935), S. 185-191 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 223 (1935), S. 241-250 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 223 (1935), S. 199-203 
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    Zeitschrift für anorganische Chemie 223 (1935), S. 209-209 
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    Zeitschrift für anorganische Chemie 223 (1935), S. 204-208 
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    Zeitschrift für anorganische Chemie 224 (1935), S. 40-48 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurde die Dialysengeschwindigkeit von HCl, HNO3, H2SO4, CH3COOH und NaOH bzw. die Neutralisationsgeschwindigkeit der Systeme HCl-NaOH, HNO,-NaOH, H2SO4-NaOH und CH3COOH-NaOH mit Anwendung von schwach und stark durchlässigen Membranen sowohl in reinem Wasser als Lösungsmittel als auch in verschieden konzentrierten NaCl-, NaNO3-und Na2SO4-Lösungen bei 25°C gemessen.
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    Zeitschrift für anorganische Chemie 224 (1935), S. 103-106 
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    Zeitschrift für anorganische Chemie 224 (1935), S. 113-129 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Kohlenoxyd wird von Cupritetramminverbindungen, z. B. Cupritetramminhydroxyd, -carbonat, -acetat, -chlorid, -sulfat, -nitrat, in wäßrig-ammoniakalischen Lösungen aufgenommen unter Bildung von Kohlendioxyd, das zu Carbonat gebunden wird und in der Lösung verbleibt. Die Absorption des Kohlenoxyds, die zunächst langsam vor sich geht, wird dann durch autokatalytische Vorgänge wesentlich beschleunigt. Alles Cuprisalz wird in Cuprosalz übergeführt unter Entfärbung der Lösungen, die schließlich Cuproammincarbonat und dasjenige Cuproamminsalz enthalten, das dem ursprünglich angesetzten Cupriamminsalz entspricht.
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    Zeitschrift für anorganische Chemie 224 (1935), S. 265-272 
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    Zeitschrift für anorganische Chemie 224 (1935), S. 305-314 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 224 (1935), S. 329-336 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Die Suszeptibilität des Chrom-II-sulfids, -selenids und -tellurids sind bei verschiedenen Feldstarken und Temperaturen gemessen. Chromsulfid und -selenid erwiesen sich bei allen untersuchten Temperaturen als paramagnetisch, das Chromtellurid dagegen bei niedrigen Temperaturen als ferromagnetisch. Die Curietemperatur wurde zu 70° C bestimmt.
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    Zeitschrift für anorganische Chemie 225 (1935) 
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    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 225 (1935), S. 73-80 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: Für den Nachweis geringer Mengen Kobalt neben Eisen mittels der Ammoniumrhodanid-Acetonreaktion wird zur Abscheidung des Ferrieisens gefälltes Calciumcarbonat verwendet. Während nach der Arbeitsweise von VOGEL (Trennung mittels Sodalösung) und nach der Methode von KOLTHOFF (Komplexmachung des Ferrieisens mittels Ammoniumfluorid) die Empfindlichkeit der Kobaltreaktion wesentlich herabgesetzt wird, wird bei der Eisenabscheidung mittels Calcium carbonat der Kobaltnachweis nicht beeinträchtigt, indem noch 1,5 mg Co/Liter neben einer mindestens 10000 fachen Menge Eisen durch die mit Rhodanid-Aceton eintretende Blaufärbung nachweisbar sind. Die bei den Methoden von VOGEL baw. KOLTHOFF für die eintretende Verminderung der Empfindlichkeit des Kobaltnachweises mit Rhodanid-Aceton in Betracht kommenden Umstände werden an Hand von Versuchen besprochen.
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    Zeitschrift für anorganische Chemie 224 (1935), S. 225-252 
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    Zeitschrift für anorganische Chemie 225 (1935), S. 93-96 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: Eisen(II)-Carbonat wurde nach SENARMONT hergestellt und sein Dissoziationsdruck im Temperaturbereich 258-285° bestimmt. Bei 760 mm beträgt die Dissoziationstemperatur 282°. Die Dissoziationswärme ist 20 900 cal. Die Dissoziation selbst geht stufenweise unter Bildung von Zwischenverbindungen vor sich.
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    Zeitschrift für anorganische Chemie 225 (1935), S. 142-150 
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    Notes: No Abstracts.
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    Zeitschrift für anorganische Chemie 225 (1935), S. 312-318 
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    Notes: No Abstracts.
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    Zeitschrift für anorganische Chemie 226 (1935), S. 33-45 
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    Topics: Chemistry and Pharmacology
    Notes: 1. Es ist nicht möglich, auf Grund der Dialysenkoeffizienten von Ionen in die innere Struktur ihrer Hydrathüllen einzudringen.
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    Zeitschrift für anorganische Chemie 225 (1935), S. 204-208 
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    Zeitschrift für anorganische Chemie 225 (1935), S. 221-224 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No Abstracts.
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    Zeitschrift für anorganische Chemie 225 (1935), S. 243-253 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ähnlich wie K2(B2H2) wurde K2(B2H10) durch Schütteln von B4H10 rnit Kaliumamalgam hergestellt. Die Isolierung des Salzes und die Untersuchung seiner thermischen Zersetzung sind durch Nebenreaktionen erschwert. Doch ließ sich feststellen, daß eine erste Stufe der Zersetzung, bei 170°, in der Reaktion K2(B4H10)→K2(B4H8)+H2 besteht und daß bei höherem Erhitzen, bis 450°, nur noch weiterer Wasserstoff abgegeben wird, während das Verhältnis 2K : 4B erhalten bleibt. Die Beobachtungen stützen die Annahme, daß der von K-Abspaltung begleitete thermische Zerfall des K2(B2H6) über K2(B4H10) führt.
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  • 77
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    Zeitschrift für anorganische Chemie 226 (1936), S. 139-140 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 78
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    Zeitschrift für anorganische Chemie 226 (1936), S. 168-172 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 79
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    Zeitschrift für anorganische Chemie 226 (1936), S. 185-191 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 80
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    Zeitschrift für anorganische Chemie 226 (1936), S. 289-309 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurden aus vier uranhaltigen Mineralien verschiedener Herkunft und verschiedenen geologischen Alters reine Uranpräparate gewonnen und die Atomgewichte dieser Uranproben bestimmt.
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  • 81
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    Zeitschrift für anorganische Chemie 226 (1936), S. 333-337 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 82
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    Zeitschrift für anorganische Chemie 226 (1936), S. 359-369 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es werden die bisher bekannten Chloride, Bromide, Oxyde und Sulfide des Vanadins dargestellt und magnetisch bei Zimmertemperatur, -78°C und -183O°C untersucht.
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    Zeitschrift für anorganische Chemie 226 (1936), S. 416-424 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Von den 5 in der Literatur angeführten Quecksilbersulfit-verbindungen des Kaliums und des Natriums: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {[\rm Hg^{Cl}_{SO_3}]K,} \\ {\rm [Hg(SO_3)_2]K_2,} \\ {\rm HgSo_3 \cdot ClNa,} \\ {\rm Na_2SO_3 \cdot 2HgSO_3} \\ {\rm {und}\,\, [Hg(SO_3)_2]Na_2} \end{array}$$\end{document} konnten wir auf potentiometrischem Wege nur von den 3 folgenden die Existenz bestätigen, und zwar: \documentclass{article}\pagestyle{empty}\begin{document} $$\begin{array}{*{20}c} {\rm [Hg^{Cl}_{SO_3}]K}, \\ {\rm [Hg(SO_3)_2K_2} \\ {\rm und\,\,[Hg(SO_3)_2]Na_2} \end{array} $$\end{document}.
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  • 84
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    Zeitschrift für anorganische Chemie 227 (1936), S. 32-36 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die 6-Hydrate der Doppelfluoberyllate M2 IBeF4·M11BeF4·6H2O (MI= Rb und MII = Ni, Co, Zn, Cu, Cd und FeII( wurden beschrieben; auch Cs2BeF4·NiBeF4·6H2O ist erhalten worden. Diese Doppelsalze sind Analoga der von Locke und Tutton untersuchten Doppelsulfate; Zusammensetzung und Eigenschaften beweisen die Analogie des BeFi4″-ions mit dem SO4″-ion.
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    Zeitschrift für anorganische Chemie 227 (1936), S. 62-64 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 86
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    Zeitschrift für anorganische Chemie 227 (1936), S. 179-183 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei Versuchen über die Zusammensetzung des Kaolinmoleküls (der Tonsubstanz) ist zu berücksichtigen, daß der als Versuchsmaterial verwendete Zettlitzer Kaolin nicht zu 100% aus reiner Tonsubstanz besteht, sondern mindestens 10%, Beimengung in Form von Feldspat und Glimmerresten enthält. Aus diesem Grunde kann eine Wasserabbaukurve niemals 2 Mol H2O anzeigen. Es erscheint demnach durchaus verständlich, wenn Körner, Pukall und Salmang bei einem isobaren Abbau nur etwa 1,5 Mol gebundenes Wasser feststellen konnten. Da eine hydrothermale Synthese des Kaolins aus Feldspat, Glimmer usw. möglich ist, gelingt es auch, die in gewöhnlichem Kaolin vorliegenden Beimengungen durch eine hydrothermale Nachbehandlung in Kaolin umzuwandeln. Bei einem so behandelten Kaolin läßt sich der Gehalt an gebundenem Wasser bis auf 1,76 Mol H2O erhöhen. Hieraus ist zu schließen, daß die Zusammensetzung der Tonsubstanz, wie allgemein angenommen, der Formel Al2O3·2 SiO2·2H2O entspricht.
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    Zeitschrift für anorganische Chemie 227 (1936), S. 237-248 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Das dreiwertige Ruthenium bildet stark komplexe Ammine mit der Koordinationszahl 6.
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    Zeitschrift für anorganische Chemie 227 (1936), S. 272-272 
    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 227 (1936), S. 337-340 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Das schwerlösliche, beim Versetzen von Flußsäure mit Rubidiumcarbonat in kleinen Mengen entstehende Salz ist Rubidiumsilicofluorid.
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    Zeitschrift für anorganische Chemie 221 (1935), S. 287-317 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die neuen Erkenntnisse, welche die Aufstellung der Konstitutionsformeln für die Polysäuren erbracht hat, lassen sich folgendermaßen zusammenfassen.
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    Zeitschrift für anorganische Chemie 221 (1935), S. 318-320 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 92
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    Journal of Morphology 57 (1935), S. 1-29 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Two kinds of spermatozoa are formed in the testis of Goniobasis laqueata, typical (eupyrene) and atypical (apyrene); a similar dimorphism is noted in several other related genera. The development of each type of spermatozoon is described in Goniobasis. The apyrene spermatozoa do not appear in the testis until eupyrene spermatogenesis has progressed to the formation of mature eupyrene spermatozoa. After this time apyrene spermatogenesis becomes predominant. It is suggested that this condition is indicative of a modified protandric hermaphroditism, according to a recent theory of spermic dimorphism. The anatomy of the reproductive system of Goniobasis is described briefly, and the behavior and fate of the two types of spermatozoa are noted. Only the eupyrene spermatozoa are inclosed in a spermatophore formed in a special organ of the male, the apyrenes being somehow excluded. Thus the latter do not reach the female in copulation and can have no necessary functional relationship to the ova at the time of fertilization. The delayed formation of the apyrene spermatozoa, and other facts, indicate that they are probably not concerned with the nutrition or transport of the eupyrene spermatozoa.
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  • 93
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    Journal of Morphology 57 (1935), S. 31-59 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The little capsules in which snails of this family deposit eggs are so durable as sometimes to be found adherent to museum specimens; hitherto, however, detailed descriptions of such capsules have been restricted to the capsules long known as made by Neritina fluviatilis in fresh waters of Europe. The present paper adds descriptions, with measurements and sketches, of Neritina reclivata from Florida, Neritina virginea, Neritina punctulata, Theodoxus mneleagris, Nerita peloronta, Nerita alticola, Nerita tesselata and Neritilia succinea from Jamaica, British West Indies.These capsules are found to be remarkable in that the digestive tract aids in their formation; that is, the capsules are made as secretions of the lower oviduct to which mineral particles are added, and these mineral particles are supplied from the intestine and stored up in a special sac opening into the oviduct. Moreover, the mineral particles are of twofold origin; in some Neritinas they come from the ooze taken in with the food and passed through the intestine; in some Neritas they come from the liver as calcospherites, to be passed through the intestine.It is hoped that the data given will aid future descriptions of capsules from other species till a firm foundation is built for utilization of these capsules as aids in taxonomy.
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    Journal of Morphology 57 (1935), S. 105-112 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: There is as yet no proof that the prepollex and postminimus ever occurred as actual digits. Romer's discovery of previous confusion of the preaxial with the postaxial fin border of Sauripterus allows a more accurate interpretation of primitive conditions. The latter involved essential asymmetry. The carpal cartilages of the Sauripterus type offin must have split into transverse rows. When the radius and ulna had become of equal length there was redistribution of the most proximal carpals, thus displacing elements in the other rows. It seems that eventually the original first carpale assumed the position and function of a first metacarpal, while the original fifth metacarpale assumed the position and function of a fifth carpale.
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    Journal of Morphology 57 (1935), S. 113-129 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The external genitalia of female termites are readily homologized with those of female roaches. Mastotermes and other representative termites from every family are compared and their phylogenetic relationships within the group are found to agree, with the exception of the Hodotermitidae, with those based on studies of other structures.
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    Journal of Morphology 57 (1935), S. 131-145 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: A hitherto unknown secondary sex character in male frogs consists of a series of connective tissue bands which extends the entire length of both layers of the Obliquus muscle, at both their dorsal and ventral borders. Extensions of the ventral bands may be carried inward toward the midline at certain of the inscriptiones tendinae. These bands are named the Lineae masculinae. They are clearly visible in specimens from which the skin has been removed, and are visible even through the skin in living specimens of certain species of Kaloula.Ninety-one genera and 553 species of the frogs and toads of the world were examined for the presence or absence of this structure. It is distinct in the common American and European ranids, such as Rana pipiens and Rana esculenta. It is entirely absent in many genera. When present it is found only in adult males, being absent in sexually immature males and females of all ages. Examination revealed no seasonal variations in males of Rana pipiens. This indicates that there is some correlation between the expression of this character and the sexual hormones. No function is assigned to the Linea masculina, although it is suggested that it may be associated in some way with voice production. A discussion of the taxonomic distribution of the character is included.
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    Journal of Morphology 57 (1935), S. 213-251 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The hyobranchial apparatus and throat musculature of the plethodontid salamanders are examined. The interhyoideus is thought to be the homologue of the intermandibularis posterior and the posterior part of the intermandibularis anterior. The quadrato-pectoralis is found only in Desmognathus (Leurognathus?), and Aneides. Its presence in the former is a primitive condition; in the latter, secondary. The gularis had its phylogenetical origin as a slip from the quadrato-pectoralis. The lingual cartilage is found only in Gyrinophilus, Pseudotriton, Eurycea, and Manculus. It is the homologue of the [sehnenplatte] of Salamandra; not the otoglossal. The presence of the suprapeduncularis and the absence of the genioglossus is not peculiar to adult free tongued genera. The anatomical evidence allies Batrachoseps with Hydromantes and Oedipus. The latter two genera are derived from ancient Plethodon stock, not from Gyrinophilus stock. Stereochilus, Typhlotriton, and Typholomolge are the degenerate descendants from ancient Gyrinophilus stock.
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    Journal of Morphology 57 (1935), S. 429-459 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Accounts of binary fission for two species of Chilomastix by Bélar ('21) and Boeck and Tanable ('26) differ. Consequently, investigations were initiated to study the cytology and to determine the nature of binary filssion in Chilomastix mesnili of man, Chilomastix mesnili (?) of anthropoid apes and monkeys, and Chilomastix intestinalis of guinea pigs.The material used for the study included the following: four heavily infected human cases of Chilomastix mesnili, twenty-one infections of Chilomastix mesnili (?) from a survey of thirty-six anthropoid apes and monkeys at the Philadelphia Zoölogical Gardens, and Chilomastix intestinalis from six guinea pigs.The results of the investigations indicate that binary fission of the above three species of Chilomastix are similar in essential details. Encystment is described for the species from man and from anthropoid apes and monkeys. No evidence for mitosis within the cysts was obtained for C. mesnili of man. In C. mesnili (?) from primates other than man, the appearance of cyst nuclei resembling mitotic processes is explained as variations occurring in nuclei. Binucleate cysts are believed to be formed by the encystment of abnormal binucleate individuals which never had undergone plasmotomy after division of the nuclei.
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    Journal of Morphology 57 (1935), S. 275-302 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The sexual dimorphism of Chinese cobitids consists of peculiar structures of the pectoral fins and of variations in the lengths of these as well as of the ventral fins. In all groups the paired fins are, as a rule, longer in the male sex, and the female has no lamina circularis, enlargement of pectoral rays or dilation of lateral muscles.In males of Cobitis and Misgurnus, the second rays of the pectorals are enlarged and possess at their base a bony plate (lamina circularis). In other Chinese genera the lamina circularis is absent. Males of the Misgurnus group are easily recognized by the dilation of the lateral muscles in the region of the dorsal fin. Males of Barbatula have several enlarged inner rays in the pectoral fin and numerous nuptial tubercles on the head, arranged in prepercular and preorbital groups. In the European, B. barbatula, however, tubercles on the head are wanting.In males of the Leptobotia and probably Botia groups, the first pectoral ray is enlarged, and the membrane between several of the inner rays is covered with nuptial tubercles.In general, in the Chinese cobitids the differences in sexual dimorphism are correlated with the differences between genera, i.e., each genus possesses a quite different sexual dimorphism; thus the secondary sexual characters can be used for taxonomic purposes.
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    Journal of Morphology 57 (1935), S. 533-545 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The thyroid primordium is a solid median outgrowth from the pharynx which is attached to the truncus arteriosus at its bifuracation. The thyroid is soon detached from the pharynx and migrates to its definitive position ventral to the aorta between the bases of the third visceral pouches. After detachment the primary follicle appears in the lower part of the primordium; during migration and early growth it is divided apparently by stress and pressure to form secondary follicles. Independent follicles are formed also by secretion of colloid between solid masses of thyroid cells. Other secondary follicles are formed by pinching off evaginations from large follicles. Colloid appears soon after the primary follicle is divided. The adult thyroid is a group of follicles scatterd in a venous plexus in the ventral pharyngeal region, around the aorta.
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