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13:16 IWF (Göttingen) English 1985

Activator-Inhibitor - A Model of Biological Pattern Formation

In the development of higher organisms, pattern forming reactions must be involved. In the movie, a yet hypothetical two-component reaction is analysed which is able to generate patterns. Computer simulations made on the basis of two coupled non-linear differential equations show the time course and the regulatory properties of this reaction.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: English
13:17 IWF (Göttingen) German 1985

Aktivator-Inhibitor - Ein Modell zur biologischen Musterbildung

Das mathematische Modell wird in Computersimulationen interpretiert, wobei sich die verschiedenen Muster durch Variation der Parameter bilden: Anstoßen durch statistische Schwankungen, verschiedene Regenerationsabläufe, spezifische und unspezifische Induktionen, oszillierende Muster und Ausrichtungen, periodische Muster sowie regelmäßige Muster während des Wachstums.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
02:04 IWF (Göttingen) German 1985

Photophobische Reaktionen - Navicula

Pennales. Autonomous reversal rhythm in Navicula peregrina and step-down-reaction in darkness or step-up-reaction in bright light. Slight time-lapse and animation.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
26:53 IWF (Göttingen) English 1985

The Planar Double Pendulum

Computer experiments made it possible to describe the complex dynamics of this classical exemple in mechanics. To begin with, the various types of motion of the double pendulum are presented. With the help of the method of Poincaré sections, a qualitative survey of the complex dynamics follows, with special emphasis on irrational winding numbers (golden ratio).
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: English
26:34 IWF (Göttingen) German 1985

Das ebene Doppelpendel

Physikalisches (Realaufnahmen) und mathematisches (Computer-Simulationen) Doppelpendel; ausführliche Diskussion der Bewegungsformen (periodisch, quasi-periodisch, chaotisch) in Abhängigkeit von zahlreichen Ausgangssituationen bei verschiedenen Energieniveaus. Aufbau und Interpretation zugehöriger Poincaré-Schnitte. Darstellung des Zerfalls der "letzten KAM-Linie".
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
15:08 IWF (Göttingen) German 1985

Chromatographie - 2. Analysentechniken

Gerätetechnische Demonstration dreier verschiedener moderner chromatographischer Verfahren. 1. Dünnschichtchromatographie: Anwendung von Nanoliter-Kapillaren; Probennehmer und Auftragsautomat; Flachboden-, Sandwich-, Linearentwicklungs-, Antizirkular-Kammer; Sprühentwicklung; Tauchkammer; Photometer-Scanner; Plotter; Integrator; Drucker. 2. Hochleistungs-Flüssigkeits-Chromatographie: Säulen; Reaktionsdetektor. 3. Gaschromatographie: Trennsäulen und Trennkapillaren; Ionisationsdetektor.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
04:34 IWF (Göttingen) English 1985

Chromatography - 4. Packing of a Liquid Chromatograph (LC) Separation Column

Each of the steps involved in the homogenous packing of a separation column with silica gel as a stationary phase for low pressure-hypotension liqiuid chromatography is described. A dye mix is used to test the quality, or efficiency, of separation of the column. This is done by comparing the column with columns which have already been completely separated.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: English
04:28 IWF (Göttingen) German 1985

Chromatographie - 4. Packen einer flüssigkeitschromatographischen Trennsäule

In der Niederdruck-Flüssigkeitschromatographie werden handelsübliche oder selbstgepackte Trennsäulen benutzt. Deren Trennleistung hängt von der Qualität der Säulenpackung ab. Demonstration einzelner Fertigungsschritte: Einfüllen von Kieselgel und Lösungsmittel; Verdichtung der Packung; Test mit Farbstoffmischung; Zonenbildung als Qualitätstest.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
07:26 IWF (Göttingen) Silent film 1985

Ips typographus (Ipidae) - Kopulation und Eiablage

In the mating chamber the typographus male copulates twice with a female. Copulation is initiated by either male or female. The mates separate 10-30 seconds after the union. The egg-laying behaviour of the female is shown in 3 examples. The female always gnaws the new egg-niche at the end of the gallery. Mandibles and maxillae form a functional unit for gnawing. To lay the egg, the female backs up to the niche and lays egg directly into it. Afterwards she closes the niche with crumbs of phloem which she has already placed at the end of the gallery for this purpose.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: Silent film
03:34 IWF (Göttingen) Silent film 1985

Quantenmechanik des Wasserstoffatoms - Strahlungsübergänge im semi-klassischen Modell

Radiative transitions of the hydrogen atom are discussed on the basis of the semi-classical model. Here the radiation is described by classical electrodynamics whereas the H atom is treated quantum mechanically. The coupling between the atom and the radiation field is accounted for by time dependent perturbation theory. After a brief discussion of the theoretical basis of the semi-classical model the radiative transitions 1s [-] 2p (m = 0,±1) are described in some detail. In particular, results are given for the time dependence of the center of gravity [r ] of the electron density and of the density itself. Also, comparison of the rotating wave approximation with the exact numerical solution of the semi-classical model is made. This manuscript forms a theoretical basis of the film which shows the time dependence of the electron density for the above transitions using an animation based on computer graphics.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: Silent film
04:01 IWF (Göttingen) German 1985

Titration

Determination of the acidity of a solution using normal (molar) NaOH. Burette with Kjeldahl lines, cleaning, greasing the stopcock. Filling it with adjusted normal solution; adding indicator. Neutral point, colour change of phenolphthalein in basic, neutral and acidic solutions.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
12:29 IWF (Göttingen) German 1985

Schwingung eines Duffing-Oszillators

Bei nichtlinearen Problemen treten spezielle Schwingungsformen auf. Sie werden mit Hilfe der partiellen Duffing-Differentialgleichung berechnet und mit Phasendiagrammen erläutert. Demonstration charakteristischer Fälle in computergezeichneten Phasen an einem beidseitig eingespannten Balken: unsymmetrische Schwingungen, Amplitudensprünge und "chaotische" Schwingungen (strange attractor).
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
Offline Collection IWF (Göttingen) German 1985

Zellbiologische Studien an Physarum polycephalum - Ein Modell zur Untersuchung cytoplasmatischer Actomyosine

Plasmodial slime moulds. It is shown how the rhythmic contraction of the cytoplasm in the plasmodium and in individual strands forms the basis for the regular reversal in cytoplasmic streaming. Radial rhythms in a strand are measured by infrared reflection; tensiometry and photometrically; longitudinal rhythms in strand segments are measured tensiometrically under isometric as well as isotonic conditions. Synchrony of contractile rhythm in a strand is demonstrated with the help of the so-called "Trapeze". Time-lapse. Cf. C 1543.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
05:09 IWF (Göttingen) Silent film 1985

Muscardius avellanarius (Gliridae) - Bündeln von Nistmaterial

A common dormouse collects moist grass and leaves. The grasses are, in part, fanned out with its teeth. They are formed into loops with the aid of the forepaws and guided to the mouth. With slow motion photography.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: Silent film
Offline Collection IWF (Göttingen) German 1985

Fruchtkörpertypen und Sporenverbreitung bei Discomyceten (Ascomycetes)

Compilation of a morphological range of fruit bodies, starting from the typical apothecium of the cup fungus (Peziza), the stalked fruit bodies of the morels (Morchella) and helvellas, to the fruit bodies of the truffles. Ascospores release is shown in microscope preparations and spore propagation in situ. Partially with time-lapse, phase contrast.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
Offline Collection IWF (Göttingen) German 1985

Eipo (West-Neuguinea, Zentrales Hochland) - Arbeiten im Gartenland: Pflegen, Ernten und Pflanzen von Taro

Uwok, a leading man in Malingdam, cultivates his taro garden at an altitude of 2100 metres: He uproots the weeds, heaps them up around the taro plants (Colocasia esculenta) as green manure, takes up sods of grass with the digging stick, and places them upside-down about the plants. Uwok harvests taro and plants the sprout again. He roasts small taro tubers in the fire for a spontaneous meal.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
Offline Collection IWF (Göttingen) German 1985

Eipo (West-Neuguinea, Zentrales Hochland) - Arbeit mit dem Steinbeil im Malingdam-Bereich

To provide firewood Uwok, a leading man in Malingdam, climbs up a tree (Sloanea tieghemii) in the mountain-forest and cuts off a big branch of relatively hard wood by means of a stone adze. The work being well done, the blade (of andesite) remains undamaged since crossfibres are carefully avoided.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
Offline Collection IWF (Göttingen) German 1985

Eipo (West-Neuguinea, Zentrales Hochland) - Schleifen von Steinklingen am Kirimye

A young man from Munggona is sharpening the blade of a stone knife on a stone on the Kirimye River. An old man comes along and sharpens his stone adze's blade. The sharp cutting edge arises as the result of grinding the upper and lower edges on a wet stone.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
Offline Collection IWF (Göttingen) German 1985

Eipo (West-Neuguinea, Zentrales Hochland) - Vorbereitungen zum Kampf

Uwok, a leading man in Malingdam, puts on the tight-fitting cuirass of rotan strips and wraps up his neck with pieces of carrying nets. - Alerted men of Malingdam assemble on the slope below the settlements and decorate themselves, before going to meet the enemy.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
12:29 IWF (Göttingen) English 1985

Vibration of a Duffing-Oscillator

In non-linear problems special forms of oscillation occur. They are calculated with the aid of the Duffing differential equation and illustrated using phase diagrams. Demonstration of characteristic cases in computer-drawn phases on a bilaterally mounted beam: unsymmetrical oscillations, amplitude jumps and "chaotic" oscillations (strange attractor).
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: English
Offline Collection IWF (Göttingen) German 1985

Klassische Psychotherapie - V. Familientherapie

Record(ing) of the initial interview in a family therapy projcet (discussion partners: K Gerlicher/ married couple with two school age boys). The film serves the purposes of analysis and the study of a psycholanalytically oriented interviewing technique.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
Offline Collection IWF (Göttingen) Silent film 1985

Eipo (West-Neuguinea, Zentrales Hochland) - Entfernen der Barthaare durch Zupfen

Sitting on a slope below the settlement, Uwok, a leading man in Malingdam, removes the hair of his beard with a bent stick of Ulmacea wood. He puts the stick to the beard, stretches it, and pulls off the jammed hair. In this way he contours the whiskers rather well, whereas the rest of the shaving is done less properly. Carelessly Uwok leaves the hair pulled off on the ground.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: Silent film
Offline Collection IWF (Göttingen) Silent film 1985

Eipo (West-Neuguinea, Zentrales Hochland) - Feuersägen

In his garden on a low plain below the settlements Uwok, a leading man in Malingdam, makes fire. He presses a split stick with the feet to the ground, passes a rotan string underneath and "saws" until glowing sawdust is dropping on the "tinder" (dried leaves) placed below. After several vain attempts (breaking of the rotan string) Uwok finally succeeds in producing a blaze.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: Silent film
Offline Collection IWF (Göttingen) Silent film 1985

Eipo (West-Neuguinea, Zentrales Hochland) - Flechtspiel »tetim aik«

In Malingdam the boy Sinkin executes the plaiting game "house of the bat" (tetim aik). He detaches from two pieces of banana leaves narrow strips which he interlaces. He is joined by three other boys who try to surpass him by attaining a better "performance", a finer interlacing.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: Silent film
15:08 IWF (Göttingen) English 1985

Chromatography - 2. Analytical Techniques

The equipment used in the techniques for making liquid and gaseous chromatographic separations as thin-layer chromatography, high-capacity column chromatography and gas chromatography are presented here. Deposit of samples, encouragement of the mobile phase and the qualitative as well as the quantitave evaluation of chromatograms all require different kinds of instrumentation, depending on the technique of chromatographic separation involved. Together, these different instruments form an independent system of analysis. The various combinations of appliances used in these techniques of chromatographic analysis are shown.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: English
12:03 IWF (Göttingen) German 1985

Präparation des Labyrinths beim Katzenhai

As a first step, the chondrocranium of the dogfish is cleaned from the skin and adhering muscles from above. By cautiously working with a scalpel, thin superficial layers of the cartilage are cut away until the holes of the three semicircular ducts are opened. The rest of the preparational proceeding is done by means of a pointed steel forceps which is used for cutting or breaking the cartilage away. In the final spots, the results of the preparation is displayed: The three semicircular ducts together with three ampullae and the utriculus in their natural spatial arrangement.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
03:21 IWF (Göttingen) Silent film 1985

Anabas testudineus (Anabantidae) - Fortbewegung außerhalb des Wassers

The film shows a climbing perch swimming in the aquarium and resting on the bottom; distinct movements of respiration are to be seen. Outside of the water the animal moves forward supported by its opercularia, which are able to extend widely. The fish presses either one operculum or both of them alternatively against the ground and is pulled forward by an effective adduction. In addition (to the movements of the opercularia) the region of the tail presses the body off the ground in a way of producing small leaps. The pectoral and the ventral fins serve Anabas as sustaining organs. Three different types of locomotion are to be observed.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: Silent film
09:52 IWF (Göttingen) Silent film 1985

Stercorarius skua (Stercorariidae) - Beutefang- und Freßverhalten

The film shows predation, killing and feeding habits of the Great Skua (Stercorarius skua skua) with three different preys (Rissa tridactyla, Larus marinus, Fratercula arctica). Also food-piracy (kleptoparasitism) with Sula bassana. All shots from Shetland Islands, GB, at 25 fps.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: Silent film
14:46 IWF (Göttingen) German 1985

Heideimkerei - 1. Mitteleuropa, Nördliches Niedersachsen - Frühjahrsarbeiten in einer Korbimkerei

Beekeeper Georg Klindworth (Langenfelde bei Sittensen) inspects the hives for the winter and prepares for spring swarming. In spring the bees are brought in transportable hives for 3-4 weeks in apple, pear and cherry orchards, where they initially are fed. Pollen and nectar are collected. In weekly inspections the beekeeper removes drone and queen cells and keeps the swarms equal.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
23:42 IWF (Göttingen) German 1985

Elektronenmikroskopische Methodik - Präparation der Grünalge Micrasterias

In this film the collection of Desmids (especially Micrasterias) in peat bogs and the following establishments of semi-sterile algae cultures is shown. With the green alga Micrasterias as a modell-cell the different preparative steps for transmission-electron microscopy e. g. fixation, embeding into plastic, ultrathin sectioning, staining and electron microscopy (taking of pictures and its interpretation) is demonstrated.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
18:51 IWF (Göttingen) English 1985

Canine Interdigestive Gastrointestinal Motility

The motility of stomach and small intestine is subdivided in the periods of digestive and interdigestive motility. These consist of rhythmic, recurring activity cycles and begin 8 to 12 hours after feeding. X-ray pictures and graphic presentation.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: English
09:22 IWF (Göttingen) Silent film 1985

Chelus fimbriatus (Chelidae) - Beuteerwerb

A fringed turtle (Matamata) is capturing living and dead fish by means of suction snapping. Slow-motion. 480 f/s.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: Silent film
16:56 IWF (Göttingen) German 1985

Brutbiologie der Uferschwalbe (Riparia riparia)

The film presents the breeding cycle of the sand martin from burrow excavation till the leave of the young of the first brood. The following stages of the breeding cycle are shown with the behaviours typical to them: Burrow excavation, nest-building, pair-flights, caring for the chicks at the burrow entrance, luring and leading of fledgelings by the parents and the behaviour of independent chicks. A considerable part of the species' rich vocal repertoire is presented with the corresponding behaviour.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
Offline Collection IWF (Göttingen) German 1985

Eipo (West-Neuguinea, Zentrales Hochland) - Terrassieren und Bepflanzen eines Hanges (Wiederbewirtschaftung von Brachland)

After several years of fallow the garden area below Malingdam is cultivated again. After chopping down the secondary vegetation, the slope is terraced with the digging stick and with the hands. The beds are planted with sweet potato cuttings and taro sprouts. The work is done individually: every man prepares and cultivates "his" plot of ground owned by the community.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: German
Offline Collection IWF (Göttingen) Original sound, no spoken text 1985

Arctocephalus galapagoensis (Otariidae) - Geburt und frühe Mutter-Kind-Beziehung

Galapagos Sea Bear. Breech delivery in all phases. The mother does not eat the placenta. Interactions between the mother and the newborn. Behaviour of a dam to its stillborn child.
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: Original sound, no spoken text
Offline Collection IWF (Göttingen) Silent film 1985

Circus aeruginosus (Accipitridae) - Flugverhalten

Marsh harrier Controlled flight, gliding flight, soaring flight, hunting flight, transferring prey in the air. With slow motion photography. Field shots
  • Published: 1985
  • Publisher: IWF (Göttingen)
  • Language: Silent film
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