Show filters Hide filters

Refine your search

Publication Year
1-36 out of 82 results
Change view
  • Sort by:
10:39 IWF (Göttingen) English 1982

The Larger Foraminifer Heterostegina depressa - Organization and Growth of the Megalospheric Generation

The foraminiferan constructs a test and attaches it to the substrate with elastic threads. There are large numbers of symbionts (Diatoms) in its protoplasm; Heterostegina gets its nourishment from them. The film shows test anatomy and organic protective sheaths, cytoplasmic streaming and symbiont transport, local movement with pseudopodia and chamber formation in detail. With time-lapse.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: English
08:44 IWF (Göttingen) English 1982

Hormone Effects in Sexual Reproduction of Brown Algae

Attached female Ectocarpus gametes attract the male gametes with the pheromone ectocarpen, which they release into the sea water. Mature Laminaria egg cells effect the release of their pheromone. With high-speed, time-lapse and animated sequences.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: English
10:41 IWF (Göttingen) German 1982

Die Großforaminifere Heterostegina depressa - Organisation und Wachstum der megalosphärischen Generation

Die Foraminifere bildet eine Hülle und befestigt diese mit Hilfe elastischer Fäden am Substrat. Im Protoplasma sind zahlreiche Symbionten (Kieselalge) enthalten, von denen Heterostegina lebt. Der Aufbau des Gehäuses und der Hülle, Schalenstruktur, Protoplasmaströmung und Symbiontentransport, Ortsbewegung mittels Pseudopodien und Kammerbau werden im Detail dargestellt. Mit Zeitraffung.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
07:03 IWF (Göttingen) English 1982

Reaction of the Diatom Navicula peregrina to Illumination of Different Parts of Cell

Navicula reversing its direction of movement voluntarily (autonomic reversal rhythm); induced reversal on the boundary of a light trap (step-down reaction). Partial illumination (40 µm wide, moving light spot) of anterior and posterior cell poles and the middle of the cell prove that the poles are the sites of light preception. Red light, 670 nm; green safety light, 525 nm. Time-lapse.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: English
09:00 IWF (Göttingen) English 1982

Photokinesis and Photophobic Responses of the Diatom Navicula peregrina

Pennales. Comparison of photokinesis in intense and weak light. Autonomic reversing rhythm and photophobic responses: premature reversing at the light trap boundary through the step-down and step-up reaction. Photoaccumulation and emptying of the trap. White light. With time-lapse and animation.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: English
07:04 IWF (Göttingen) German 1982

Reaktion der Kieselalge Navicula peregrina auf Belichtung verschiedener Zellabschnitte

Rangierbewegung mit willkürlicher Bewegungsumkehr (autonomer Umkehrrhythmus) und induzierter Umkehr an der Grenze einer Lichtfalle (Step-down-Reaktion). Partielle Belichtungen (40 µm breiter, mitgeführter Lichtfleck) des "hinteren" Zellpols, des "vorderen" Zellpols und der Zellmitte beweisen, daß die Pole die Orte der Lichtperzeption sind. Rotlicht 670 nm, grünes Sicherheitslicht 525 nm. Zeitraffung.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
03:45 IWF (Göttingen) German 1982

Diffusion in Abhängigkeit vom Molekulargewicht am Beispiel verschiedener Farbstoffe

The dyes chrysoidin (mol. wt. 249), orange G (452), acid fuchsin (586), light green (793) diffuse through 10% gelatine columns. The diffusion velocity decreases with increasing molecular weight and continuous experimental duration (8 days at room temperature).
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
03:16 IWF (Göttingen) Silent film 1982

Lepus europaeus (Leporidae) - Paarungsverhalten (Freilandaufnahmen)

The film shows several European hares running and roving vividly on a field. They are chasing each other at a high speed, doubbling and jumping in the air. While cambating in upright position, they beat each other heavily with their forelegs. In the last stage of the mating preliminaries the male keeps on going over the female's back and presses her down to the ground. The female succeeds in getting rid of the male again and again, at last she runs away. The chase of the male comes to an end not before the female starts raising up its tail indicating that she is ready to couple and sits down. The pair copulates several times with only short intervals.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: Silent film
10:51 IWF (Göttingen) English 1982

Metal Cutting of Forging Grade Steel and Nodular Iron - Cutting Process in the Microstructure; Comparison of the Materials Ck 45 V, Ck 45 N, Ck 45 BY; 49 MnVS 3 BY and GGG-60

The influence of three different thermal treatments on the machinability of steel Ck 45 and also a comparison of machinability between a microalloyed steel and nodular iron. Flow chips, shear chips, shear plane, flow zone, shear angle, chip thickness ratio, built-up edge, plastic deformation. (Microcinematography, slow-motion.)
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: English
10:51 IWF (Göttingen) German 1982

Zerspanen von Schmiedestahl und Kugelgraphitguß - Schnittvorgang im Feingefüge; Vergleich der Werkstoffe Ck 45 V, Ck 45 N, Ck 45 BY; 49 MnVS 3 BY und GGG-60

Einfluß drei verschiedener Wärmebehandlungen auf die Zerspanbarkeit des Stahls Ck 45 sowie Vergleich der Zerspanbarkeit zwischen einem mikrolegierten Edelbaustahl und Kugelgraphitguß. Fließspäne, Scherspäne, Scherebene, Fließschicht, Scherwinkel, Spandickenstauchung. Aufbauschneide, plastische Verformung. Zeitdehnung.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
30:19 IWF (Göttingen) German 1982

Schafzucht im schottischen Hochland - Lammzeit

During the ewing-period the shepherd has to take especially care of the flocks. He has to assist the ewes in ewing, to control the feeding of the lambs, and to switch orphaned and abandoned lambs to ewes that have lost their lamb. This is still done by the traditional method of skinning: The dead lamb's skin is slipped on the abandoned lamb to deceive the mother ewe. At this time the shepherd must also warm newly-born, supercooled lambs inside the house and feed them artificially.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
33:38 IWF (Göttingen) German 1982

Schafzucht im schottischen Hochland - Schur und Auktion

Before shearing, done with electric devices and hand shears, the lambs are separated from the flock. The lambs are not yet shorn but dipped in a disinfectant, parasiticidal liquid prescribed by law. For the auction, held in autumn, the sheep for sale are loaded on special trucks and transported from the pasture to the public sale.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
08:59 IWF (Göttingen) German 1982

Photokinese und photophobische Reaktionen der Kieselalge Navicula peregrina

Pennales. Vergleich der Photokinese im Stark- und Schwachlicht. Autonomer Umkehrrhythmus und photophobische Reaktionen: vorzeitige Umkehr an Fallengrenzen durch Step-down- und Step-up-Reaktion. Photoakkumulation und Fallenentleerung. Weißlicht. Mit leichter Zeitraffung und Zeichentrick.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
10:13 IWF (Göttingen) German 1982

Entwicklung beim Seeigel (Psammechinus miliaris) - 3. Metamorphose

Das Einschmelzen des Larvenkörpers wird in Zeitraffung dargestellt. Den Übergang von der Bilateralsymmetrie des Pluteus zur fünfstrahligen Radiärsymmetrie erläutert ein Zeichentrick. Die Metamorphose wird durch Zugabe von Cäsiumchlorid ausgelöst.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
24:18 IWF (Göttingen) German 1982

Borsukscher Antipodensatz

The movie shows Borsuk's Antipodal Theorem. This theorem provides the existence of solutions of systems of nonlinear equations. First theorem is statet for one and two dimensions. Then, in the main part, an elementary geometrical proof of the theorem is given, which shows the aspect of solving of equations as well as the topological aspect.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
04:51 IWF (Göttingen) German 1982

Der Einfluß des Ionenmilieus auf die Quellung von Agar

Preparation of Hofmeister's lyotropic series of cations (Li, Na, K, Rb, Cs) and anions (Cl, Br, J). Due to the agar's negative charge, its degree of imbibitional swelling decreases with increasing ionic radius of the cations and with increasing ionic radius of the anions.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
04:31 IWF (Göttingen) German 1982

Traubesche Zelle

Formation of a Traube Cell is followed in time-lapse photography starting from a crystal of potassium hexacyanoferrate II in a 4% copper sulphate solution through its development until the destruction of the semipermeable deposit membrane and reversal of the cell.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
Offline Collection IWF (Göttingen) German 1982

Tänze der Kinder aus dem südlichen Niedersachsen

In the village and in schoolyards children of eight to twelve perform traditional and modified dances and dancing games such as dances for two, round dances, line dances, clapping games.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
Offline Collection IWF (Göttingen) German 1982

Psychologie des Lernens - Grundlegende Prinzipien

Instinctive behavioural patterns and behavioural patterns both inprinted and learnt outside sensitive phases sorted according to the principles of classical and operant conditioning; discrimination, psychomotive training and learning by observation in animals including humans.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
Offline Collection IWF (Göttingen) German 1982

Aspekte des Kinderspiels - II. Elemente, Strukturen und Systeme

Boys and girls of differing ages in various play situations. Viewpoints while playing, structural elements, systems of playing.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
19:18 IWF (Göttingen) Silent film 1982

Mitteleuropa, Schleswig - Winterfischfang (Eiswade) der Holmer Fischer

Principal operations of the last big "Eiswade" (catching fish with a drag net drawn below the layer of ice) carried on by fishermen of Holm on March 9th, 1965: cutting holes in the ice, introducing the nets, taking out the bag containing the fish, assorting the fishes.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: Silent film
04:39 IWF (Göttingen) German 1982

Arum maculatum (Araceae) - Anthese und Pollination

In the film the interesting example of a trap plant, catching insects for pollination, as to be found in Arum maculatum L., the Fly Trap, is demonstrated. After introduction by outdoor pictures of a population of this species, just being in the flowering period, the whole of course of the anthesis of this monoecious and protoynous inflorescence is shown. Impressive close-up pictures of the fertile part of the inflorescence situated in the chamber, formed by the lower part of the spathe, follow. This part is constructed by revolving of the spathe, a large hypsophyll at the base of the inflorescence, and by tieing up form the upper part of the spathe, which unrolls before the anthesis starts. This chamber functions as a trap for small insects, which landing on the upper smooth part of the spathe hurl down into the trag. The chamber contains the spadix of the inflorescence, covered at the base with female flowers consisting of naked ovaries with hairy stigmas and above them with male floswers of only 3-4 stamens. Just beneath the corded part of the spathe some sterile female flowers act as bristles like a weir-basket. On the top of the spadix a smooth purplish appendix juts out of the chamber, standing before the unrolled upper part of the spathe and emanating an urine-like scent. the female flowers at first ripe in the afternoon and exudeduring the night small droplets of nectar by the stigma. if insects are missing, these droplets are resorbed, while otherwise trapped insectsmtake them up. During the following male period of the inflorscence, which starts on the next morning and runs quickly, the antheres open and discharge the pollen grains. These trinkle down to the insects, small midges of the genus Psychoda, enabling them to pollinate female flowers of an other inflorescenece, if they leave the trap after wilting of the bristles of the weirbasket about 24 hours later and hurling down to the chamber of the next plant being in anthesis. The film ends eith outdoor pictures of the infructescences of Arum maculatum in the autumn with red berries.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
18:48 IWF (Göttingen) English 1982

Heathland Beekeeping - 8. Central Europe, Northern Lower Saxony - Bees' Wax Pressing in a Traditional Apiary

Remains of the combs from honey extraction are used for wax production. Heating the kettles, melting the wax in water, separating wax and water in a collecting tub, pouring the wax into forms, cleaning and storing the wax blocks.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: English
Offline Collection IWF (Göttingen) German 1982

Gynäkologische Untersuchung

Course of a gynaecological examination of a multipara; required instrumentarium. Inspection, use of a bipartite or duckbill vaginal speculum; examination of the vaginal mucosa; cytosmear at the portio and in the cervix, physiological cell types; micrographs of bacteria and fungi; vaginal examination, with inner and outer palpitation examination of the adnexas and of the uterus; rectovaginal examination.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
10:19 IWF (Göttingen) English 1982

Gestalt Perception in the Common Toad - 2. Modification of Prey Recognition by Learning

Self-conditioning of the common toad to prey smell and modification of the innate releasing mechanism for prey capture behaviour. "Hand-conditioning". Fine differentiation of prey dummies by stimulus-specific habituation.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: English
03:45 IWF (Göttingen) Silent film 1982

Vampyrella lateritia (Rhizopoda) - Ingestion von Spirogyra-Protoplasten

The film describes one of the most interesting phases of the life cycle of the vampyrellid Vampyrella lateritia Leidy. The behaviour during the attack of living cells of Spirogyra is documented, and, for the first time, the cooperation of special ingestion pseudopods is demonstrated.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: Silent film
10:17 IWF (Göttingen) German 1982

Gestaltwahrnehmung bei der Erdkröte - 2. Modifikation des Beuteerkennens durch Lernen

Selbstdressur der Erdkröten auf Beuteduft und Modifikation des AAM für das Beutefangverhalten. Handdressur. Feinunterscheidung von Beuteattrappen durch reizspezifische Gewöhnung (s. a. Film C 1805).
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
16:22 IWF (Göttingen) German 1982

Gestaltwahrnehmung bei der Erdkröte - 1. Angeborenes Beuteerkennen

Prey-catching behaviour. Analysis of the visual-key-stimulus "prey" through experiments with dummies. ("worm/antiworm" configuration). Behaviour with changing stimulation-background contrast. Direction, speed and contrast variance in shape recognition.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
19:29 IWF (Göttingen) German 1982

Gestaltwahrnehmung bei der Erdkröte - 3. Neuroethologische Analyse des angeborenen Beuteerkennens

Neuroethological investigational methods. Configurational prey recognition and its directional variance. Neurophysiological recording experiments show the activities of individual neurons in the optic tectum and caudal dorsal thalamus. Triggering of prey capture and fleeing by specific point stimulation of the brain. Modification of the innate releasing mechanism through local brain lesion. Animated demonstration of the toad brain and a model of the innate releasing mechanism.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
19:25 IWF (Göttingen) English 1982

Gestalt Perception in the Common Toad - 3. Neuroethological Analysis of Prey Recognition

Neuroethological investigational methods. Configurational prey recognition and its directional variance. Neurophysiological recording experiments show the activities of individual neurons in the optic tectum and caudal dorsal thalamus. Triggering of prey capture and fleeing by specific point stimulation of the brain. Modification of the innate releasing mechanism through local brain lesion. Animated demonstration of the toad brain and a model of the innate releasing mechanism.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: English
Offline Collection IWF (Göttingen) Silent film 1982

Mitteleuropa, Lombardei - Pflügen mit dem Hakenpflug

At Grano (Alta Valcamonica, Brescia Province) a family ploughs a field and plants potatoes: The steeply rising ground is ploughed with a body ard drawn by a horse. The potatoes are deposited in the open furrow following the plough and covered by the next furrow slice. Finally the ground is smoothed with a hoe. The work is done uphill.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: Silent film
06:56 IWF (Göttingen) German 1982

Mitteleuropa, Tirol - Käsebereitung auf einer Alm im Gsiestal

On an Alpine farm in St. Magdalena (South Tyrol) the farmer's wife makes cheese: She pours milk into a large copper vessel hanging on a turning arm over the hearth and heats it. As rennet she uses a powder mixed water and a pinch of salt. She stirs the milk continuously and watches the temperature. At 40-50°C she adds two thirds of the rennet and reduces the heat. After a certain time she breaks the curdled milk with a whisk and adds the remaining rennet. Finally she skims the whey and packs the curd into the mould, placing on the lid stones to press the cheese. - Salt is rubbed into the surfaces of the shaped young cheese, overlapping edges are cut, and the cheese is stored in a cheese-room.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
01:26 IWF (Göttingen) Silent film 1982

Zellteilung - Escherichia coli

Elongation of the bacterial cell. Invagination and division through simple fission. Growth of a bacterial colony on agar plates. Time-lapse.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: Silent film
09:51 IWF (Göttingen) Silent film 1982

Mitteleuropa, Schleswig - Schmieden eines Hufeisens in Ulsnis

The 76-year-old smith shapes from two old horseshoes one new horseshoe with 4 holes on each side. The tools used are a fore-hammer, hand-hammer, pickhammer, blacksmith's fuller, punch, and anvil.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: Silent film
04:35 IWF (Göttingen) Silent film 1982

Mitteleuropa, Schleswig - Nagelschmieden in Ulsnis

The 76-year-old smith shapes from two old horseshoes nails on the anvil by means of a hand-hammer and a heading-tool.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: Silent film
07:11 IWF (Göttingen) Silent film 1982

Mitteleuropa, Holstein - Herstellen von Halftern in Glückstadt

The film shows the manufacture of a short cord consisting of sisal-yarn and the way of splicing a halter out of it.
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: Silent film
out of 3 pages
Loading...
Feedback

Timings

  115 ms - page object
   39 ms - search
    1 ms - highlighting
    0 ms - highlighting/16894
    1 ms - highlighting/14275
    1 ms - highlighting/11301
    1 ms - highlighting/11299
    1 ms - highlighting/11612
    1 ms - highlighting/15261
    1 ms - highlighting/12400
    1 ms - highlighting/15240
    1 ms - highlighting/15143
    1 ms - highlighting/11742
    1 ms - highlighting/14374
    1 ms - highlighting/15242
    1 ms - highlighting/11741
    1 ms - highlighting/11548
    1 ms - highlighting/11439
    1 ms - highlighting/14597
    1 ms - highlighting/11740
    1 ms - highlighting/11437
    1 ms - highlighting/14608
    1 ms - highlighting/16062
    1 ms - highlighting/15141
    1 ms - highlighting/15142
    1 ms - highlighting/10843
    0 ms - highlighting/14961
    0 ms - highlighting/17103
    0 ms - highlighting/10837
    0 ms - highlighting/14600
    0 ms - highlighting/10841
    0 ms - highlighting/10844
    0 ms - highlighting/10845
    0 ms - highlighting/10842
    0 ms - highlighting/14492
    0 ms - highlighting/14599
    0 ms - highlighting/14274
    0 ms - highlighting/14629
    0 ms - highlighting/17102

Version

AV-Portal 3.8.0 (dec2fe8b0ce2e718d55d6f23ab68f0b2424a1f3f)