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  • Inorganic Chemistry  (8,001)
  • Biology
  • Ertrag
  • Hafer
  • LUNAR AND PLANETARY EXPLORATION
  • 2010-2014  (26)
  • 1930-1934
  • 1925-1929
Collection
Language
Years
Year
  • 1
    Publication Date: 2021-05-19
    Description: The pearl oyster Pinctada radiata and the cockle Cerastoderma glaucum are among the most abundant bivalve molluscs in southern Tunisian waters. These species are not currently subject to any investigation despite their important economic value in the world. For this reason, their biological parameters, their spatial distribution and their stock assessment were undertaken in the Gulf of Gabes. The reproductive cycle was studied in relation to variations of the environment parameters. The specimens were collected monthly during one year (2007) in sites of El Kraten and El Jorf (Kerkennah Islands) for the first species and sites of Sidi Mansour and El Hicha (North of Sfax and Gabes) for the second. An intraspecific polymorphism biometric trait for P. radiata and C. glaucum was performed using statistical comparison methods and multivariate analysis methods. Results of analyzes showed heterogeneity between populations. For Pinctada radiata, the sex ratio unbalanced, although males dominated among smaller individuals and females were predominant in larger size-classes. Evidence of protrandric hermaphroditism was observed with males maturing earlier than females. Seasonal changes in macroand microscopic properties of the gonads of both sexes showed that this species displayed a clearly defined annual reproductive cycle with a major peak in summer and a minor peak in autumn. The onset of reproduction appears to be triggered by the rising seawater temperature during spring and summer. P. radiata exhibited a short resting phase that occurred simultaneously in both sexes from the end of December until early February. For Cerastoderma glaucum, the overall samples presented a balanced sex ratio, with males dominating among smaller individuals and females predominating in larger size classes. The seasonal changes assessed through macro- and microscopic properties in the gonads of both sexes indicated a clearly defined annual reproductive cycle. Reproductive activity of C. glaucum was greatest from spring to late autumn, with two reproductive peaks (May and November). Gametogenic activity in both sexes was apparently triggered by the rising seawater temperature during spring and summer. These results support previous findings of latitudinal changes in the reproductive behaviour of C. glaucum. Due to the extensive period of gonadal activity, C. glaucum exhibited a short resting phase that occurred simultaneously in both sexes throughout January and February. In terms of stock assessment and spatial distribution of P. radiata, results showed a scattered distribution pattern of the species according to location and depth ranging between 0 and 145 ind.m-². P. radiata was encountered from the intertidal zone to 40 m depth, with a highest population densities recorded at depth range of 2-20 m. The total stock was estimated to be 27584.9 ± 11504.5 million individuals. Oyster distribution seems influenced by the substrate type. This high population of pearl oysters was associated with large cover of seagrass Posidonia oceanica which provides an excellent substratum for attachment. The littoral zone seems not to be the preferred habitat for the proliferation of this immigrant species. Oysters’ size increased steadily with depth, ranging from a mean of 37.98 ± 0.40 mm SH at 0-1 m to 60.98 ± 0.68 mm SH at 20-100 m depth range. Size structure analysis showed that deep water population was dominated by large individuals reaching 96 mm SH. In terms of geographical occupation and stock assessment of C. glaucum, results showed a scattered distribution pattern of the species according to location. The consequence was a remarkable biomass which represented 4736 tons of total fresh weight and high abundance levels reaching over 1982 million individuals estimated in the area of 20122 hectares. In conclusion, this study is the first report of an extraordinary abundance of Pinctada radiata and Cerastoderma glaucum in southern Tunisian waters. It gives more information about their stocks in the colonization area. The data may help to determine future quantitative changes indicating trends in the study area that are exposed to various factors of environmental conditions and human activities.
    Description: Submitted
    Description: ABONDANCE
    Description: BILOGIE
    Description: Pinctada radiata
    Description: Cerastoderma glaucum
    Description: Huitre perlière
    Keywords: Abundance ; Biology ; Shellfish
    Repository Name: AquaDocs
    Type: Theses and Dissertations , Phd thesis
    Format: 170
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  • 2
    Publication Date: 2021-05-19
    Description: Instittuto Nacional de Investigaçao Pesqueira, INIP, luanda , Angola
    Description: Bachelors
    Description: Trabaho de fin cdoursado para obtençâo do grau de licenciatura em Biologica
    Description: Published
    Description: biologia marinha, fitoplâncton, limnologia, algas
    Description: marine biology, phytoplankton, algae,
    Keywords: Phytoplankton ; Nannoplankton ; Biology ; Limnology ; Algae
    Repository Name: AquaDocs
    Type: Theses and Dissertations , Bachelor thesis
    Format: 56
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  • 3
    Publication Date: 2021-05-19
    Description: A yield per recruit model has been used to compare the effects of mesh size increment on the yields and revenues of the fisheries of Cameroon under two different cases. Case 1 assumes the commercial fishery to move from the exploitation of three age-groups to two age-groups with no interactions with the artisanal fishery, whereas Case 2 takes into account these interactions. The difference in the percentage increase of yield per recruit between case 1 and case 2 is 61% at current fishing (46% and 18% yield per recruit increment in cases 1 and 2 respectively). The usually accepted long-term yield per recruit increment with increase of age at first capture (with a single non-interacting fisheries) is, in this case, cancelled out. However, the revenues increase by 72% and 63% in cases 1 and 2 respectively. Therefore the economic approach, compared with purely biological analyses, is more convincing. In general, as fisheries always interact, a single-fishery management approach should not be the rule as it is at present; management strategies should consider interactions between different fisheries and be based on their economic performances and not, as said earlier, on purely biological considerations. This is because a biological approach to fisheries management will, at best, be modified by economic factors, or, at worst, be ignored totally in favour of economic policies.
    Description: Published
    Keywords: Biology ; Fisheries ; Biological interaction ; Sciaenidae ; Fisheries development ; Fishery management ; Yield/recruit ; Commercial fisheries ; Artisanal fishing
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 4
    Publication Date: 2021-05-19
    Description: Published
    Description: Chinchard (Trachuurus trecae)
    Description: Biologie
    Keywords: Biology ; Exploitation
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 5
    Publication Date: 2021-05-19
    Description: Published
    Description: langoustes
    Description: marquage
    Description: poisson
    Keywords: Lobsters ; Biology ; Ecology ; Aquatic biology
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 6
    Publication Date: 2013-04-05
    Description: The technological demand to push the gigahertz (10(9) hertz) switching speed limit of today's magnetic memory and logic devices into the terahertz (10(12) hertz) regime underlies the entire field of spin-electronics and integrated multi-functional devices. This challenge is met by all-optical magnetic switching based on coherent spin manipulation. By analogy to femtosecond chemistry and photosynthetic dynamics--in which photoproducts of chemical and biochemical reactions can be influenced by creating suitable superpositions of molecular states--femtosecond-laser-excited coherence between electronic states can switch magnetic order by 'suddenly' breaking the delicate balance between competing phases of correlated materials: for example, manganites exhibiting colossal magneto-resistance suitable for applications. Here we show femtosecond (10(-15) seconds) photo-induced switching from antiferromagnetic to ferromagnetic ordering in Pr0.7Ca0.3MnO3, by observing the establishment (within about 120 femtoseconds) of a huge temperature-dependent magnetization with photo-excitation threshold behaviour absent in the optical reflectivity. The development of ferromagnetic correlations during the femtosecond laser pulse reveals an initial quantum coherent regime of magnetism, distinguished from the picosecond (10(-12) seconds) lattice-heating regime characterized by phase separation without threshold behaviour. Our simulations reproduce the nonlinear femtosecond spin generation and underpin fast quantum spin-flip fluctuations correlated with coherent superpositions of electronic states to initiate local ferromagnetic correlations. These results merge two fields, femtosecond magnetism in metals and band insulators, and non-equilibrium phase transitions of strongly correlated electrons, in which local interactions exceeding the kinetic energy produce a complex balance of competing orders.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Tianqi -- Patz, Aaron -- Mouchliadis, Leonidas -- Yan, Jiaqiang -- Lograsso, Thomas A -- Perakis, Ilias E -- Wang, Jigang -- England -- Nature. 2013 Apr 4;496(7443):69-73. doi: 10.1038/nature11934.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23552945" target="_blank"〉PubMed〈/a〉
    Keywords: Biology ; Chemistry ; Circular Dichroism ; Electronics ; Iron/chemistry ; *Magnetic Phenomena ; Magnetics ; Optics and Photonics ; Photosynthesis ; *Quantum Theory ; Temperature ; Time Factors
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 7
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    Nature Publishing Group (NPG)
    Publication Date: 2013-09-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England -- Nature. 2013 Sep 12;501(7466):136.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24032131" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Autobiography as Topic ; Biology ; *Literature, Modern ; Physics ; *Research Personnel ; Self Concept
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 8
    Publication Date: 2023-01-12
    Description: Biological lectures given at the Marine Biological Laboratory in Woods Hole in the summer of 1895
    Description: Publications
    Keywords: Biology ; Publications
    Repository Name: Woods Hole Open Access Server
    Language: English
    Type: Text
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  • 9
    Publication Date: 2023-01-12
    Description: Biological lectures given at the Marine Biological Laboratory in Woods Hole in the summer of 1893
    Description: Publications
    Keywords: Biology ; Publications
    Repository Name: Woods Hole Open Access Server
    Language: English
    Type: Text
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  • 10
    Publication Date: 2023-01-12
    Description: Biological lectures given at the Marine Biological Laboratory in Woods Hole in the summer of 1890
    Description: Preface -- Specialization and organization, companion principles of all progress. The most important need of american biology, by C.O. Whitman -- Naturalist's occupation: 1. general survey. 2. a special problem, by C.O. Whitman -- Some problems of Annelid morphology, by E.B. Wilson -- Gastraea theory and its successors, by J.P. McMurrich -- Weismann and Maupas on the origin of death, by Edward G. Gardiner -- Evolution and heredity, by Henry Fairfield Osborn -- Relationships of the sea-spiders, by T.H. Morgon -- On caryokinesis, by S. Watase -- Ear of man: its past, present and future, by Howard Ayers -- Study of Ocean temperatures and currents, by William Libbey, Jr.
    Description: Publications
    Keywords: Biology ; Publications
    Repository Name: Woods Hole Open Access Server
    Language: English
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  • 11
    Publication Date: 2023-01-12
    Description: Biological lectures given at the Marine Biological Laboratory in Woods Hole in the summer of 1894
    Description: Publications
    Keywords: Biology ; Publications
    Repository Name: Woods Hole Open Access Server
    Language: English
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  • 12
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    Marine Biological Laboratory (Woods Hole, Mass.) | Biodiversity Heritage Library
    Publication Date: 2023-01-12
    Description: Biological lectures given at the Marine Biological Laboratory in Woods Hole in the summer of 1899
    Description: Evolution of the sporophyte in the higher plants, by Douglas Houghton Campbell -- Nature of the evidence exhibited by fossil plants, and its bearing upon our knowledge of the history of plant life, by D.P. Penhallow -- Influence of inversions of temperature, ascending and descending currents of air, upon distribution, by D.T. MacDougal -- Significance of mycorrhizas, by D.T. MacDougal -- Instinct, by Edward Thorndike -- Associative processes in animals, by Edward Thorndike -- Behavior of unicellular organisms, by Herbert S. Jennings -- Blind-fishes, by Carl H. Eigenmann -- Some governing factors usually neglected in biological investigations, by Alpheus Hyatt -- On the development of color in moths and butterflies, by Alfred Goldsborough Mayer -- Physiology of secretion, by A. Mathews -- Regeneration: old and new interpretations, by T.H. Morgan -- Nuclear division in protozoa, by Gary N. Calkins -- Significance of the spiral type of cleavage and its relation to the process of differentiation, by C.M. Child -- Aims of the quantitative study of variation, by C.B. Davenport -- On the nature of the process of fertilization, by Jacques Loeb
    Description: Publications
    Keywords: Biology ; Publications
    Repository Name: Woods Hole Open Access Server
    Language: English
    Type: Text
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  • 13
    Publication Date: 2023-01-12
    Description: Biological lectures given at the Marine Biological Laboratory in Woods Hole in the summer of 1896-1897
    Description: Variations and mutations of the introduced sparrow. Passer domesticus, by Hermon C. Bumpus -- Cleavage and differentiation, by E.G. Conklin -- Centrosomes of the fertilized egg of Allolobophora foetida, by Katharine Foot -- Methods of palacontological inquiry, by W.B. Scott -- Physiology of excretion, by Arnold Graf -- Some neural terms, by Burt G. Wilder -- Classification of the North American Taxaccae and Coniferae on the basis of the stem structre, by D.P. Penhallow -- Selection of plant types for the general biology ccourse, by James Ellis Humphrey -- Rate of Cell-division and the function of the centrosome, by A.D. Mead -- Coalescence experiments upon the Lepidoptera, by Henry E. Crampton, Jr. -- Some of the functions and features of a biological station, by C.O. Whitman
    Description: Publications
    Keywords: Biology ; Publications
    Repository Name: Woods Hole Open Access Server
    Language: English
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  • 14
    Publication Date: 2023-01-12
    Description: Biological lectures given at the Marine Biological Laboratory in Woods Hole in the summer of 1898
    Description: Publications
    Keywords: Biology ; Publications
    Repository Name: Woods Hole Open Access Server
    Language: English
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  • 15
    Publication Date: 2021-05-19
    Description: Se incluyen en el análisis 271 trabajos publicados en diversas revistas científicas y cuyo material básico de estudio fue observado, colectado y analizado en el Caribe colombiano, pero fundamentalmente en el área de influencia directa del INVEMAR. Las contribuciones han sido publicadas en alemán (111), español (109) e inglés (51). Dichos trabajos incluyen investigaciones de carácter descriptivo (175) y analítico (96) e involucran el ambiente terrestre (91) y el acuático (180). Las regiones incluidas en loa estudios son: Parque Tayrona (84), Santa Marta (59), Ciénaga Grande (51) y otras áreas (77); y en cuanto a las ramas de la ciencias: la Biología (212), la Geología (9) y otras áreas (50).
    Description: Two hundred and seventy one works published in different scientific journals are included and whose basic study material was observed, collected and analized in the Colombian Caribbean, but basically in INVEMAR direct influence área. The contributions have been published in Germán (111), Spanish (109)and English (51). These works include research of descriptive character (175) and analitic (96), and involve land (91) and aquatic (180) environments. The regions included in the studies are the following: Tayrona Park (84), Santa Marta (59), Ciénaga Grande (51), and other arcas (77); and concerning the scientific branches: Biology (212), Geology (9) and other arcas (50).
    Description: Published
    Description: Bibliography,
    Keywords: Estuaries ; Geology ; Coastal lagoons ; Biology ; Coastal lagoons ; Estuaries ; Biology ; Geology
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 16
    Publication Date: 2021-05-19
    Description: During a 3 week study, a total of 55 individuals of the redlip blenny (Ophioblennius atlanticus) were observed for at least two 15-minute periods, and several for ten of such periods. The sizes of their territories were estimated, the color pattern of each specimen an intra and interspecific interactions were recorded. The mean territory size of the redlip blenny in the study area appeared to be greater than that of these blennies studied in Curacao and Barbados by NURSALL (1977), the difference reflecting perhaps different methods of identifying the territories or a lower density of O. atlanticus in the Santa Marta área. Territories did not appear to be as consistently defended at the study area as at Barbados/Curacao and our impression ¡s that individuals holding large territories are less likely to defend their borders. It seems possible that light colored individuals are protected by their coloration from attack by dark colored territory owners. In territorial defense the redlip blennies grabbed each other tighthy by the mouth and struggled in this position repeatedly for about 15 seconds. Interspecific antagonism was common in the present study, the redlip blennics defended their territory frequently against Eupomacentrus dorsopunicans or E. partitus.
    Description: Durante un estudio de tres semanas, un total de 5 i individuos del bií'nido Ojih'toblcnnius atlnniicur. fueron observados por lo menos durante dos períodos de 1 í minutos para cada individuo y en algunos casos hasta por 10 de estos periodos. Se estimó el área de sus respectivos territorios y se tomó notí de los patrones de coloración de cada espécimen y de las relaciones intra e interespecificas de ellos. El tamaño promedio del territorio de estos blénidos resultó ser mayor que el de los respectivos territorios estudiados por NURSALL (1977) en Curacao y Barbados. Esta diferencia posiblemente se debe a un método diferente de definir los territorios o refleja una densidad menor de la población de O. aílanticus en Santa Marta, Los territorios del área fueron defendidos con menor intensidad a como lo fueron los de Barbados/ Curacao y es nuestra impresión que individuos ocupando un territorio extenso tienden a defender sus límites en menor grado. El color claro de algunos individuos probablemente los protege de agresiones por parte de individuos de color oscuro. En el acto de defensa territorial intraespecífica, los blénidos se agarran por sus bocas y se sacuden mutuamente durante aproximadamente 15 segundos , pudiéndose repetir esti varias veces. Con frecuencia se observarondefensas de los territorios dirigidas hacia los peces doncella Eupomacentrus dorsopunicnas y E. partitus.
    Description: Published
    Keywords: Fisheries ; Biology ; Fisheries ; Biology
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 17
    Publication Date: 2021-05-19
    Description: Sícydium antillarum Grant es un gobiido abundante en las corrientes que bajan de la SierraNevada de Santa Marta (Colombia) al mar. Se estudió la población de la Quebrada Valencia y las postlarvas en las bocas de los ríos Manzanares y Gaira, entre febrero de 1987 y enero de 1988. Se presentan datos morfológicos, merísticos y morfométricos de la especie; la población desovó de mayo a diciembre, con picos máximos en junio y octubre. La proporción hembras: machos fue casi 1:1 de enero a marzo; de abril a diciembre los machos se apoderan de un territorio y se dificulta su captura, principalmente en septiembre y octubre (proporción 9:1). La fecundidad máxima fue de 91067 huevos en una hembra de 109 mm; el 25% de los ejemplares alcanzó la madurez entre 60.0 y 64.9 mm. La relación talla (mm) - peso (gr) fue: Peso = 1.039x10'6 xlongitud total 35232 . El factor de condición sufre un descenso en noviembre, después del mayor pico de desove de la estación lluviosa. Los contenidos estomacales estaban integrados por algas y bacterias; la especie es diurna, encontrándose el 100% de individuos con el estómago lleno a las 15:00 horas. Las postlarvas fueron detectadas cada mes entre agosto y diciembre, al fin del cuarto menguante; adultos y postlarvas son resistentes a condiciones de laboratorio.
    Description: Sicydium antillarum Grant is an abundant gobiidfish ¡n the streams which runfrom the Sierra Nevada de Santa Marta (Colombia) tothe sea. The population living in the Quebrada Valencia was studiedfrom February 1987 to January 1988; postlarvae were observed and collected at the mouths of the Manzanares and Gaira rivers. Morphological, meristic and morphometric data of the species are presented; the population spawned between May and December, with peaks in June and October. Sex ratios between January and March were around 1:1; males defend a territory from April to December and are more difficult to capture (mainly in September and October, when the ratios are about ninefemales per male). The highest numberof eggs (91,067) was found in a female 109 mm in íength. Twenty-five per cent of the specimens reached maturity between 60.0 and 64.9 mm. The equation relating íength (mm) and weigth (gr) is: Weígth = 1.0309xtO*6 xtotal íength 35232 . Condition factor reached a low valué in November.that is after the highest spawning peak of the rainy season. The stomach contents studied were composed of algae and bacteria; all the specimens collected at 15:00 had a full stomach, which indicates that the species is diurnal. Postlarvae were detected monthly from August top December, always related to the waning moon. Adults and postlarvae are very hardy and live well in laboratory conditions.
    Description: Published
    Keywords: Ecology ; Geographical distribution ; Reproductive behaviour ; Feeding behaviour ; Ichthyology ; Biology ; Ecology ; Ichthyology ; Geographical distribution ; Reproductive behaviour ; Feeding behaviour ; Biology ; Morphometry ; Stomach content
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  • 18
    Publication Date: 2021-05-19
    Description: Se describen 19 especies de peces colectadas en los archipiélagos coralinos de las islas del Rosario y de San Bernardo, las cuales son nuevos registros para el Caribe continental colombiano. Tres de esas especies (Ichthyapus ophioneus, Calamopteryx goslinei y Apogon leptocaulus) no habían sido colectadas antes en el Caribe sur, por lo que estos récords son nuevos para este sector del Mar de las Antillas. Se incluye información sobre aspectos biológicos y ecológicos de las especies.
    Description: 19 species of fishes coliected in the coralline archipelagos of Islas de) Rosario and San Bernardo, which are reponed for the first time for the Colombian continental Car¡bbean, are described. Three of those species (Ichtyapus ophioncus, Calamopteryx goslmei and Apogon leptocaulus) had not been collected before in the southern Caribbean, being therefore new records for this section of the Sea. Biological and ecological information about the 19 species is given as well.
    Description: Published
    Keywords: Fish ; Ecology ; Biology ; Fish ; New records ; Biology ; Ecology
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  • 19
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    In:  Journal of Agricultural Science, Volume: 149, p.33-47
    Publication Date: 2011
    Description: Verwendung eines gemischten Regressionsmodels für die Vorhersage der Kornernte unter fünf Klimaszenarien für zwei Bodentypen (sandige und lehmige Böden) und zwei Regionen in Dänemark (West Zealand und Central Jutland). KATASTER-BESCHREIBUNG: Auswirkung von Änderungen im Klima (Temperatur und Strahlung) auf die Ernteerträge von Getreide. Im Durchschnitt nehmen die Erträge unter den projizierten Klimaänderungen um 1.6-12.3% ab. Die durchschnittliche Abnahme bis 2020 beträgt 3.6% verglichen zum Jahr 1985 und 8.0% bis 2040. Die Abnahme ist für West Zealand größer als für Central Jutland und für lehmige Böden größer als für sandige Böden. KATASTER-DETAIL: Delta T (Sommer) +, dann Erträge -; Delta Sonn (Sommer, Frühling) +, dann Erträge +; Delta T (Winter) = 4,4°C, dann Erträge = max; Delta T (Winter) 〉/〈 4,4°C, dann Erträge -;
    Keywords: Dänemark ; 1992-2008, 2020, 2040 ; Ertrag ; Getreide ; Klima ; Niederschlag ; Temperatur ; Sonnenscheindauer ; Modell
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  • 20
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    In:  DGG-Proceedings, Vol. 1, No. 3, p. 1-5. DOI: 10.5288/dgg-pr-01-03-hh-2011
    Publication Date: 2011
    Description: Modifizierte Wasserhaushalts- und Ertragsmodell SIMWASER wurde genutzt, um auf der Grundlage von Klimaszenarien zukünftige Apfelerträge an der Niederelbe abzuschätzen. KATASTER-BESCHREIBUNG: ECHAM5/ OM IPCC, Szenariolauf 1, WETTREG Klimaszenarien A1B und B1, Eingang in das Regressionsmodell fanden das Vorerntejahr (*) die Sonnenscheindauer von April-Juni [Sd(04-06)*], Minimumtemperatur im November [Tn(11)*], Sonnenscheindauern im März/April [Sd(0304)] und im Mai/Juni [Sd(0506)] und die Niederschlagshöhe im Juli des Erntejahres [P07] Modellrechnungen ergeben bis zum Ende des 21.Jahrhunderts Veränderungen der phänologischen Phasen sowie der Apfelerträge.Insbesondere die signifikante Verkürzung der Periode BBCH[61-87] (p〈0.01) um 28(Szenario A1B) bzw. 19 Tage (Szenario B1) bis zum Ende des 21. Jahrhunderts ist vermutlich der maßgebliche Faktor für die signifikante Abnahme der Erträge um ca. 7 % an der Niederelbe bei sonst gleichbleibenden Rahmenbedingungen. KATASTER-DETAIL: Anomalie (yi in Prozent) der beobachteten Erträge (xoy) zum linearen Ertragstrend (xlyt) bestimmt: yi = (xoy)i / (xlyt)i Ertagsabweichung delta-y = 0.805679 + 0.00103065 Sd(04-06)* - 0.0468646 Tn11* - 0.00110369 Sd(0304) + 0.00031381 Sd(0506) - 0.00153245 P07
    Keywords: Niedersachsen ; 1973-2006 und Szenarium von 2001-2100 ; Apfel ; Ertrag ; Niederschlag ; Vegetationsperiode ; Sonnenscheindauer
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  • 21
    Publication Date: 2011
    Description: Ermittlung der Wettervariablen mit dem höchsten Risikoausgleichspotential an 13 untersuchten Standorten KATASTER-BESCHREIBUNG: Korrelation von Temperatur, Niederschlag und Sonnenscheinstungen und Zuckerertrag in Norddeutschland KATASTER-DETAIL: Korrelationskoeffizienten von 0,756 bei der Temperatur, einen Wert von -0,845 beim Niederschlag und einen Korrelationskoeffizienten bei den Sonnenstunden von 0,846
    Keywords: Norddeutschland ; 2001 - 2010 ; Zuckerrüben ; Ertrag ; Niederschlag ; Temperatur ; Sonnenscheindauer
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  • 22
    Publication Date: 2021-05-19
    Description: El objetivo de esta tesis es caracterizar las poblaciones naturales de Ulva fasciata en el sector comprendido entre los ríos Quibú y Jaimanitas al oeste de La Habana, típico de costas de emersión del Caribe Occidental, con vistas a su posible explotación. El estudio se realizó entre marzo de 1996 y enero del 2001. Los resultados más importantes permitieron comprobar que la especie U. fasciata no se distribuye de forma similar en todo este sector, en la cobertura algal intervienen de manera decisiva, el tipo de sustrato y la disponibilidad de nutrientes en el medio. Los compuestos del nitrógeno y el fósforo en el agua de mar y las diferencias en la amplitud de variación de los mismos, justifican las diferencias en la morfometría, la biomasa en pie y el estado nutricional (C, N, P) de U. fasciata y evidencia el carácter oportunista de la especie. Estas condiciones ambientales son poco variables en el tiempo, este hecho garantiza la presencia de su población, cada año, en este sector. El desarrollo de la población de U. fasciata, se favorece cuando la temperatura superficial del mar oscila entre 24ºC y 26,5ºC, los niveles de radiación global fluctúan entre 13,4 mj.m-2 y 24 mj.m-2 y acontecen precipitaciones moderadas que no exceden los 190 mm de acumulado mensual. La biomasa en pie decrece considerablemente en el verano, coincidiendo con las altas temperaturas superficiales del mar (29ºC-30ºC) y las precipitaciones intensas (〉190 mm acumulado mensual). Aunque la biomasa por unidad de área fluctúa en el tiempo, su ciclo anual tiene un patrón muy similar en todo el sector. U. fasciata tiene un contenido alto de clorofila a y b, carotenoides, proteína, carbohidratos, fibra y cenizas, así como de otros macronutrientes (Ca, Mg y K) y micronutrientes (Fe, Zn, Cr y Mn). La concentración de estos componentes manifiesta variaciones espaciales y temporales de acuerdo a los diferentes niveles de nutrifización del medio. Las concentraciones máximas de componentes en los talos coinciden con las mayores acumulaciones de biomasa en pie y acontecen en las zonas cercanas a los ríos. Esta especie posee bajo contenido de lípidos. Existen niveles altos de bacterias coliformes totales y fecales en U. fasciata, por lo que su calidad higiénico-sanitaria no siempre es buena y debe ser tratada si se desea explotar este recurso para diferentes fines.
    Description: Ulva fasciata, explotación
    Keywords: Algae ; Biology ; Algae ; Biology
    Repository Name: AquaDocs
    Type: Theses and Dissertations
    Format: 150pp.
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  • 23
    Publication Date: 2010
    Description: Mit Hilfe des Crop Growth Monitoring Systems wurden Veränderungen im simulierten potentiellen Ertrag von Kulturpflanzen und in der Biomasseproduktion beobachtet, die durch die Temperaturänderungen und Globalstrahlungsmuster hervorgerufen werden. KATASTER-BESCHREIBUNG: Die Veränderungen im potentiellen Ertrag sind geographisch unterschiedlich. In Italien und Südmitteleuropa sinkt bei mehr als drei Arten der potentielle Ertrag signifikant. In nordeuropäischen Regionen wie Großbritannien steigt das Ertragspotential mehrerer Kulturpflanzen. KATASTER-DETAIL: -
    Keywords: Europa ; 1967-2005 ; Ertrag ; Temperatur ; Globalstrahlung
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  • 24
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    In:  Climate Research, Volume 44, Issue: 1, p.55-68
    Publication Date: 2010
    Description: Entwicklung eines neuen regionalen Ernte-Models (REGCROP) zur Abschätzung von Auswirkungen des Klimas auf die regionale Ackerfruchtproduktion. Es wurden Durchläufe für 3 verschiedene Klimaszenarien und 3 typische belgische Böden (Ton, Lehm, lehmiger Sand) durchgeführt. Die Klimaauswirkungen wurden mit historischen Wetterauswirkungen verglichen. KATASTER-BESCHREIBUNG: Einfluss des Klimas (Temperatur, Niederschlag, Luftfeuchte) auf den Ertrag von Kulturpflanzen KATASTER-DETAIL: Delta T +, dann Entwicklung der Kulturpflanze + und Vegetationszeit -; Delta T + (Hitzestress) und Delta Nied - (Trockenheit), dann Ertrag (Zuckerrüben) - um 12-27% und Ertrag (Kartoffeln) - um 23-44%; Delta Nied + (Vernässung), dann Ertrag (Wintergetreide) - um 5-12%; Delta T + und günstige Dampfdruckdefizite, dann Ertrag + um 6-7%;
    Keywords: Belgien ; 1960-2008 ; Zuckerrüben ; Kartoffeln ; Ertrag ; Getreide ; Klima ; Temperatur ; Trockenheit ; Modell
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  • 25
    Publication Date: 2010-02-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wilson, Edward O -- New York, N.Y. -- Science. 2010 Feb 12;327(5967):775. doi: 10.1126/science.327.5967.775.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20150461" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Ants ; Biology ; *Ecosystem ; *Literature, Modern
    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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  • 26
    Publication Date: 2010-03-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaiser, Jocelyn -- Regalado, Antonio -- New York, N.Y. -- Science. 2010 Mar 12;327(5971):1308-9. doi: 10.1126/science.327.5971.1308.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20223953" target="_blank"〉PubMed〈/a〉
    Keywords: Biology ; Biotechnology ; Chile ; *Disasters ; *Earthquakes ; Laboratories ; *Research ; 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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  • 27
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    Zeitschrift für anorganische Chemie 216 (1934), S. 223-227 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tantal kann in sehr duktiler Form durch thermische Dissoziation von TaCl5 an einem glühenden Kerndraht dargestellt werden, falls dafür Sorge getragen wird, daß die Anwesenheit fremder Gase möglichst gut vermieden wird: es empfiehlt sich z. B., das TaCl5 vorher im Vakuum zu sublimieren.
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    Zeitschrift für anorganische Chemie 216 (1934), S. 305-311 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Zirkonbestimmungen erstreckten sich auf 1175 Gesteinsproben und einige Steinmeteorite und Moldavite. Die gesamte Untersuchung wurde ohne Zuhilfenahme eines chemischen Eingriffs, ausschließlich auf röntgenspektroskopischem Wege, ausgeführt, wobei die Sekundärstrahlspektroskopie (Anregung der Röntgenlinien mit Röntgenstrahlen) zur Verwendung gelangt ist.
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    Zeitschrift für anorganische Chemie 216 (1934), S. 312-314 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Der durchschnittliche Strontiumgehalt von Eruptivgesteinen beträgt 1 g Strontium in 9000 Gewichtsteilen Gestein.
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    Zeitschrift für anorganische Chemie 216 (1934) 
    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 216 (1934), S. 386-390 
    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 217 (1934), S. 1-18 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Fluor bildet bei nicht zu hoher Temperatur mit Kohlenstoff eines jeden Ordnungsgrades eine feste Valenzverbindung der Grenzzusammensetzung CF; sie wird durch Sättigen z. B. sauerstofffreien Norits bei 280° mit Fluor von 25 mm Druck und von Graphit bei 420° mit Fluor unter 760 mm Druck erhalten. In der Verbindung sind zwischen die Basisebenen des Graphits auf je zwei C-Atome zwei Fluorionen eingebaut. Die Struktur, die physikalischen und chemischen Eigenschaften des Fluorids werden mitgeteilt. Bei höheren Temperaturen entstehen aus Norit und Graphit, und natürlich auch CF, gasförmige C-Fluoride. Ihre Bildungsweise wird klargestellt, ihre Zusammensetzung in Abhängigkeit von den Bildungsbedingungen ermittelt.
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    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 217 (1934) 
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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 217 (1934), S. 347-352 
    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 217 (1934), S. 284-288 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Der Einfluß der Verdünnung und der Temperatur auf die Gallertbildung der Sole von Ferriphosphat, Zirkonium- und Aluminiumoxyd ist untersucht worden.
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    Zeitschrift für anorganische Chemie 217 (1934), S. 401-416 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Salzsaure und weinsaure Lösungen von Antimontrioxyd sowie solche von Antimonchlorid in gesättigter Kochsalzlösung sind schon durch Sonnenlicht in Gefäßen aus gewöhnlichem Glas photochemisch aktivierbar; sie oxydieren sich z. B. bei Gegenwart von elementarem Sauerstoff. Lösungen von Brechweinstein, von Antimontrioxyd in starker Schwefelsäure, von Antimontrichlorid in Tetrachlorkohlenstoff oder gesättigter Chlorcalciumlösung zeigen diese Erscheinung erst bei Einwirkung von Licht kürzerer Wellenlänge deutlich.
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    Zeitschrift für anorganische Chemie 218 (1934), S. 45-48 
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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 218 (1934), S. 113-128 
    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 218 (1934), S. 169-180 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 218 (1934), S. 190-192 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 218 (1934), S. 161-168 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Die Dissoziationsisothermen des polymeren Fluorwasserstoffdampfes wurden bei den Temperaturen 26, 32 und 38°C experimentell bestimmt.
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    Zeitschrift für anorganische Chemie 218 (1934), S. 193-200 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es wurde die Liquiduslinie im System ZrO2-SiO2 ermittelt.
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    Zeitschrift für anorganische Chemie 218 (1934) 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 218 (1934), S. 241-248 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die thermische Untersuchung des Systems Au-Ca ergibt das Auftreten von sechsintermediären Kristallarten, von denen drei (Au4Ca, Au2Ca und AuCa1,11) durch Maxima gekennzeichnet sind, während die übrigen (Au3Ca, AuCa1,33 und AuCa2) durch peritektische Umsetzungen entstehen. Die Phase AuCa1,11 besitzt als einzige ein ausgedehntes Homogenitätsgebiet (49 - 56 At.-%, Ca). Au2Ca und AuCa1,11 bilden je zwei Modifikationen. Die mikroskopischen Befunde (bis 35 At.-% Ca) sind in Übereinstimmung mit den Ergebnissen der thermischen Analyse.
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    Zeitschrift für anorganische Chemie 218 (1934), S. 255-256 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 218 (1934), S. 273-300 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Wir haben eine Hypothese vorgeschlagen, welche eine ursächliche Beziehung zwischen der Struktur und der Farbe der Jodlösungen feststellt.
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    Zeitschrift für anorganische Chemie 220 (1934), S. 113-141 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 220 (1934), S. 142-144 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 220 (1934), S. 209-218 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Darstellung von Halogeno-hydroxo- und Brenzcatechinato-hydrososalzen von Cu, Zn, Sn(II), Pb(II) wird beschrieben und ihre Konstitution erörtert.
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    Zeitschrift für anorganische Chemie 220 (1934), S. 268-272 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: Die Oxydation von Schwefel wird unter verschiedenen Bedingungen auf die Entstehung von Schwefelmonoxyd hin untersucht.
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    Zeitschrift für anorganische Chemie 220 (1934), S. 317-328 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ultramarinblau nimmt in den Schmelzen der Nitrate unabhängig von der Schmelztemperatur andere Alkalimetalle im Austausch gegen Natrium auf; die ausgetauschten Mengen sind für jedes Metall charakteristisch und von seinem Ionenvolumen abhängig.
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    Zeitschrift für anorganische Chemie 220 (1934), S. 312-316 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 220 (1934), S. 273-292 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: α-Phase. Feste Lösung von Indium in Kupfer; Sättigungsgrenze bei 715° 16,0%, bei 574° 19,20% und bei 20° 6,5% In. Cu-Gitter durch Indiumzusatz stark aufgeweitet.
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    Zeitschrift für anorganische Chemie 220 (1934), S. 329-333 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 220 (1934), S. 370-376 
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    Zeitschrift für anorganische Chemie 220 (1934) 
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    Zeitschrift für anorganische Chemie 221 (1934), S. 56-62 
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    Zeitschrift für anorganische Chemie 221 (1934), S. 63-64 
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    Zeitschrift für anorganische Chemie 216 (1934), S. 209-222 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: Es wird die Reaktion, welche beim Glühen eines Kohlenfadens im Dampf von TiCl4, ZrCl4 oder TaCl5 (im ersteren Fall bei Anwesenheit von Wasserstoff) stattfindet, studiert, und zwar einerseits durch die Änderung des elektrischen Widerstandes des Fadens, andererseits mit Hilfe einer röntgenographischen Untersuchung der erhaltenen Produkte.
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    Zeitschrift für anorganische Chemie 217 (1934), S. 19-21 
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    Zeitschrift für anorganische Chemie 217 (1934), S. 22-26 
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    Zeitschrift für anorganische Chemie 217 (1934), S. 62-64 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 217 (1934), S. 85-92 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die wichtigsten physikalischen und chemischen Konstanten der neuen Sauerstofffluoride O2F2 und OF werden mitgeteilt. Eine für die Darstellung von OF aus O2F2 geeignete Apparatur wird beschrieben.
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    Zeitschrift für anorganische Chemie 217 (1934), S. 156-156 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 217 (1934), S. 170-174 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 217 (1934) 
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    Zeitschrift für anorganische Chemie 217 (1934), S. 113-153 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 217 (1934), S. 241-253 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Zeitschrift für anorganische Chemie 217 (1934), S. 154-156 
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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 217 (1934), S. 175-188 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Läßt man verdünnte Natriumthiosulfatlösung langsam zu siedender HCl tropfen, so wird ein wesentlicher Teil der Thioschwefelsäure zu H2SO4 und H2S verseift. Dieser Vorgang verläuft nach der Bruttogleichung : \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm H}_{\rm 2} {\rm S}_{\rm 2} {\rm O}_{\rm 3} + {\rm H}_{\rm 2} {\rm O} \to {\rm H}_{\rm 2} {\rm SO}_{\rm 4} + {\rm H}_{\rm 2} {\rm S}{\rm .} $$\end{document} Ein quantitativer Zerfall in dieser Richtung konnte im Gegensatz zu Colsons Angaben nicht erreicht werden. Günstigstenfalls setzten sich 91% des angewandten Thiosulfats in diesem Sinne um.
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    Zeitschrift für anorganische Chemie 217 (1934) 
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    Zeitschrift für anorganische Chemie 217 (1934), S. 339-345 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 217 (1934), S. 346-346 
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    Zeitschrift für anorganische Chemie 217 (1934), S. 376-380 
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    Zeitschrift für anorganische Chemie 218 (1934), S. 60-64 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 218 (1934), S. 89-103 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es wurde die Existenz folgender Ammoniumsalze der selenigen Säure in kristallisiertem Zustande sichergestellt: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{c} \begin{array}{*{20}l} {\left({{\rm NH}_4} \right)_2 {\rm SeO}_3 ;} & {\left({{\rm NH}_4} \right)_2 {\rm SeO}_3 \cdot {\rm H}_2 {\rm O};} \\ {\left({{\rm NH}_4} \right)_2 {\rm Se}_{\rm 2} {\rm O}_5 ;} & {\left({{\rm NH}_4} \right)_2 {\rm Se}_{\rm 2} {\rm O}_5 \cdot 3{\rm H}_2 {\rm O;}} \\ \end{array} \\ \left({{\rm NH}_4} \right){\rm H}_3 \left({{\rm SeO}_3} \right)_2 . \\ \end{array} $$\end{document} Von diesen Salzen ist das Hydrat (NH4)2Se2O5·3H2O zum ersten Male dargestellt und dessen Anhydrid (NH4)2Se2O5 als dieser Formel entsprechend identifiziert worden.
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    Zeitschrift für anorganische Chemie 218 (1934), S. 139-145 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Sind die von GRIMM für die Bildung von Mischkristallen angegebenen Bedingungen erfüllt, so bilden sich dennoch in Gegenwart eines Lösungsmittels keine Mischkristalle, wenn der Löslichkeitsunterschied der beiden Salze sehr groß ist, weil dann das Lösungsgleichgewicht für das Auftreten von Mischkristallen zu ungünstig liegt. In den Systemen BaSO4—KMnO4—H2O und CaCO3—NaNO3—H2O treten daher keine Mischkristalle auf.
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    Zeitschrift für anorganische Chemie 218 (1934), S. 249-251 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 218 (1934), S. 252-252 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 218 (1934), S. 257-266 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Die Geschwindigkeit der Wasserstoffperoxyd-Permanganatreaktion gehorcht einer eigenartigen Gesetzmäßigkeit. Die Reaktionsgeschwindigkeit nimmt  -  ceteris paribus  -  mit steigender Peroxydkonzentration erst zu, dann ab, dann wieder zu.
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    Zeitschrift für anorganische Chemie 220 (1934), S. 180-182 
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    Zeitschrift für anorganische Chemie 220 (1934), S. 177-179 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 220 (1934), S. 193-198 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Verbindungen der 7-wertigen Stufe zeigen der Erwartung gemäß einen sehr geringen, temperaturunabhängigen Paramagnetismus.
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    Zeitschrift für anorganische Chemie 220 (1934), S. 225-235 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Der Eiweißfehler des Methylorange wurde in Gegenwart von Witte-Pepton, Casein und Ovalbumin gemessen; das Ergebnis steht in Einklang mit den Anschauungen von Hartley.
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    Zeitschrift für anorganische Chemie 220 (1934), S. 236-246 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurde der Dissoziationsdruck der Orthoborsäure und der Metaborsäure bei 100° bestimmt.
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    Zeitschrift für anorganische Chemie 220 (1934), S. 250-256 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 220 (1934), S. 257-267 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurden einige Ergebnisse der direkten Analyse von primären und tertiären Natriumaluminaten angegeben.
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    Zeitschrift für anorganische Chemie 220 (1934), S. 334-336 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 221 (1934), S. 46-48 
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    Zeitschrift für anorganische Chemie 221 (1934), S. 25-32 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es ist versucht worden, die Riesenfeldprobe vom kinetischen Standpunkt aus zu besprechen, um zu zeigen, wie sie durch Ge-brauch einer Pufferlösung einfach modifiziert werden kann, so dafi sie eindeutig zwischen „echten“ (z. B. Kaliumperoxyaulfat) und „unechten“ (z. B. Wasserstoffperoxyd) Peroxysalzen zu unterscheiden vermag. Eine schwerere Aufgabe bietet das Studium der (wahrscheinlich häufigen) Verbindungen, welche weder als „echt“ oder als extrem „unecht“ bezeichnet werden können, und welche deshalb den Wert solcher Bezeichnungen in Zweifel stellen. Einer der einfachsten dieser Fälle ist in annähernd quantitativer Weise behandelt worden; bei den komplizierteren werden gründliche kinetische Untersuchungen bei geeigneten Versuchsbedingungen nötig sein, da die einfache Probe zur Aufklärung dieser Fälle kaum genügen wird.
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    Zeitschrift für anorganische Chemie 221 (1934), S. 33-45 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Elementares Selen ist in reiner konzentrierter Salzsäure praktisch unlöslich, löst sich aber in SeO2-haltiger Salzsäure unter intensiv gelber Färbung der Flüssigkeit, wobei unter Zwischenbildung von SeCl4 (gemäß: SeO2 + 4HCl ⇄ SeCl4 + 2H2O) das Se mit dem SeCl4 gemäß: SeCl4 + Se ⇄ 2Se2Cl2 reagiert. Für die Untersuchung des quantitativen Verlaufes der Reaktion wurden Lösungen von SeO2 in Salzsäure verschiedener Konzentration mit einer Lösung von Stannochlorid in konzentrierter Salzsäure titriert, wobei die zunächst eintretende orangerot gefärbte Ausscheidung von Se beim Umschütteln der Flüssigkeit sich wieder auflöst, bis schließlich eine bleibende Trübung zu beobachten ist. Der Verbrauch an SnCl2-Lösung bis zu diesem Endpunkt gibt ein Maß für die unter den gewählten Umständen maximalen Mengen des in Lösung gebrachten Selens, die bei gleichbleibendem SeO2-Gehalt mit steigender Salzsäurekonzentration zunehmen. Das durch die Reduktionswirkung des SnCl2 gebildete Se (im Status nascendi) reagiert mit dem SeO2 bzw. SeCl4 (vgl. oben), so daß sich der Gesamtvorgang durch die Bruttogleichung: 2 SeO2 + 3 SnCl2 + 8HCl = Se2Cl2 + 3SnCl2 + 4H2O wiedergeben läßit. Gegenüber dem bei vollständigern Ablauf der Reaktion sich ergebenden theoretischen Wert verläuft bei der Titration bis zur bleibenden Trübung, also insolange das entstehende Selen (unter Bildung von Se2Cl2) in Lösung verbleibt, die Reaktion unvollständig, z. B. bei verschiedenem SeO2-Gehalt und einer HCl-Konzentration von rund 37% bis zu etwa 90% des theoretischen Wertes. Bei fallender HCl-Konzentration ist dieser Umsetzungsgrad geringer und bei einer Endkonzentration von etwa 22% HCl wird praktisch kein Se mehr unter Bildung von Se2Cl2 gelöst.
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    Zeitschrift für anorganische Chemie 221 (1934), S. 65-82 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Für die Ausführung einer Revision des Atomgewichtes des Radiums wurden uns von der Union Minière du Haut Katanga, in Brüssel 3000 mg Radiumelement leihweise zur Verfügung gestellt.
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    Zeitschrift für anorganische Chemie 221 (1934), S. 49-55 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
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    Zeitschrift für anorganische Chemie 221 (1934), S. 83-96 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die folgenden Molekularverbindungen sind hergestellt und analysiert worden:
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    Zeitschrift für anorganische Chemie 221 (1934), S. 113-123 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Wenn Schwefel allmählich zu einer Lösung Kaliumamid in flüssigem Ammoniak bei -33° zugesetzt wird, bildet sich schnell ein wenig löslicher, gelber Niederschlag. Dieser geht bei Einwirkung von weiterem Schwefel in Lösung. Der Verlauf der Reaktion mußtc indirekt bestimmt werden: a) durch Ermittlung der Gewichtsänderungen während der Reaktion, b) durch Bestimmung des bei der Reaktion und dem darauf folgenden Auspumpen des Gefäßes stattfindenden Stickstoffverlustes und c) durch Feststellung des Schwefelgewichtes, das mit einer gegebenen Menge Kaliumamid in Reaktion tritt.
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    Zeitschrift für anorganische Chemie 221 (1934), S. 129-141 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es werden Verfahren beschrieben, mit deren Hilfe es gelang, Tantalmaterial frei von fremden Elementen, wie namentlich Niob, Zirkonium und Thorium, zu erhalten. Die Reinheit des Materials wird durch röntgenspektroskopische Prüfung erwiesen.
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    Zeitschrift für anorganische Chemie 221 (1934), S. 159-160 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
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