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Folletos de aplicaciones (3)

Revista "la muestra" (12)

No. 37
NEW DIMENSIONS in sample preparation and particle analysis
No. 36
El arte de la trituración - Tecnologías contemporáneas de trituración
No. 34
PRODUCTOS NUEVOS'09
No. 33
PREPARACIÓN DE MUESTRAS EN LA VIDA REAL & NUEVOS PRODUCTOS
No. 32
SAMPLE PREPARATION for Instrumental Analysis
No. 31
GRAND PRIX Temporada 2008 & RETSCH novedades
No. 30
Molinos y medidores de partículas para el ANÁLISIS MEDIOAMBIENTA
No. 29
NOVEDADES La generación de productos del 2007
No. 27
Sample Preparation in Biology and Medical Science
No. 26
CAMSIZER - Optical Particle Size and Shape Analysis
No. 25
Retsch presents the new Ultra-Centrifugal Mill ZM 200
No. 24
Anniversary issue of the RETSCH customer magazine 10 years "the sample"

Informes técnicos (20)

Materias primas renovables a la vanguardia
Particularidades de la preparación de plantas
Análisis de sustancias nocivas en muestras biológicas
La molienda criogénica facilita la preparación de muestras de origen animal
Determinación de grasas en alimentos y forrajes
Molienda de muestras grasosas
La Fragmentación
Por lo general se asocia a la noción "fragmentación", el machacamiento, de sustancias sólidas mediante fuerza mecánica. Pero también la división de líquidos en gotas o de gases en bollas representa un proceso de fragmentación.
What Hair Reveals
The detection of illegal drugs and pharmaceuticals plays a role in various fields, for example in forensic science, road traffic accidents, in competitive sports or at the workplace. Chemical substances can be detected in blood, saliva, urine and in hair. Hair has the great advantage of storing the substances for a long period, which means that detection is still possible several months after consumption of the drug. In addition to the detection of drugs, hair samples are also used for DNA analysis as well as for the analysis of heavy metals and minerals.
La nueva generación de molinas planetarios de bolas
Los más precisos resultados de trituración en el más breve tiempo se consiguen con los nuevos molinos planetarios de bolas, de Retsch. Con el PM100 y el PM200, Retsch presenta una nueva generación de molinos planetarios de bolas con uno o dos unidades de trituración, que establecen nuevos estándares de rendimiento en este segmento de la producción.
Molienda ultrarrápida y ultrafina
El nuevo molino ultracentrífugo ZM 200 de RETSCH es un molino de rotor no sólo extremadamente rápido y cuidadoso con el material molido, sino también de uso universal gracias a su amplia gama de accesorios.
Representative Analysis Results Require Adequate Sample Preparation
A faultless and comparable analysis is closely linked to an accurate sample handling. Only a sample representative of the initial material can provide meaningful analysis results. Rotating dividers and rotary tube dividers are an important means to ensure the representativeness of a sample and thus the reproducibility of the analysis. Correct sample handling consequently minimizes the probability of a production stop due to incorrect analysis results. Thus correct sample handling is the key to effective quality control.
Down to the bone
Use of laboratory grinders for size reduction of human bones and bioceramics

Bone implants and substances for bone regeneration are used in surgery to replace degenerated bone material by implants or to “re-build” it with specific substances. The material used in implants varies from autogeneic (supplied by the patient) through allogeneic (supplied by a donor) bones to replacement materials such as hydroxylapatite (HA) and tricalcium phosphate (TCP). Bovine bones and corals are used in conjunction with synthetically produced foamed materials to form a basis for the regeneration of bone substance. Various RETSCH mills are suitable for the preliminary and fine grinding of human bones as well as bioceramic materials.
Representative results require adequate sample preparation
The following situation is typical for many production plants: After a routine quality check, the production process is stopped or an already produced batch is suspended, because the analysis results were not within the relevant critical values. But does the tested product really deviate from the specifications? The quality control managers are convinced of this because modern analysis instruments provide results with very low tolerances. The sample in question was tested several times and the result was confirmed. The question is why the product does not match the specifications although the production parameters have not been changed in any way.
The possibility that the tested product is indeed deficient cannot be excluded. However, it is often not the product itself which causes irregular analysis results but a lack of understanding of the steps which come before the analysis.
What hair reveals
The detection of illegal drugs and pharmaceuticals is important in areas such as forensic science, traffic or competitive sports. Chemical substances can be detected in blood, saliva, urine and hair, the latter having the advantage of storing the substances for a fairly long period, depending on the hair length. In addition to the tracing of drug abuse, hair samples are also used for DNA analysis.
Using the CryoMill for samples with volatile substances
For the size reduction of many materials it is more suitable to use a cryogenic mill than a laboratory mill which operates at room temperature. The sample is embrittled by liquid nitrogen which improves its breaking behavior when submitted to impact, pressure and friction; moreover, volatile components of the sample are preserved. The RETSCH CryoMill is not only the most modern and safest cryogenic mill in the market, it also provides excellent grinding results.
Efficient Grinding at –196 °C
RETSCH’s New CryoMill for Safe and Reproducible Grinding with Liquid Nitrogen
Tracking Down Fake Cashmere
Cashmere wool is the best known precious wool. It is won from the cashmere goat which originates from the high mountain region of the same name. Due to its properties such as softness and warmth, cashmere wool gains more and more popularity in the manufacture of clothing. Genuine cashmere is won solely from the goat’s downy hair and must possess a certain hair structure with an exactly defined length and thickness.
Making Whole Cell Extract of Saccharomyces cerevisiae
Preparation at the Courtesy of the Staley Lab at the University of Chicago
Cryogenic Preparation of Sample Materials
Within the context of sample preparation, size reduction plays an important role as it has a substantial influence on the results of the subsequent analysis. If the particles are too coarse or non-homogeneous the results of the analysis may turn out to be incorrect, especially if there is only a very small amount of sample material which represents the total amount.
Cryogenic disruption of yeast cells
The MM 301 can be used for cell disruption applications. In this case, yeast cells were embrittled with liquid nitrogen.
Fettbestimmung in Lebens- und Futtermitteln
Methoden und Vorgehen
Kryogener Aufschluss von Hefezellen nach dem Rout Protokoll
Das Michael Rout Labor, welches an der New Yorker Rockefeller Universität beheimatet ist, nahm erstmals 2006 Kontakt zu RETSCH in den USA auf, um die Möglichkeit der kryogenen Vermahlung von Hefezellen mit einer Planeten-Kugelmühle zu diskutieren. Das Ziel ihrer Untersuchungen war die Erforschung der „Bauweise“ von Komplexen, welche an den Zellwänden von Hefezellen zu finden sind. Für den Einsatz einer Planeten-Kugelmühle sprach in erster Linie, dass sehr feine Partikelgrößen erreicht werden können, was eine wichtige Voraussetzung für fundierte Analysen an den Hefezellen ist. Eine Partikelgröße im Submikron-Bereich begünstigt eine hohe Ausbeute für die nachfolgende Proteinreinigung.
Stabilisotopenanalyse in der Forensik – Geographische Herkunftsbestimmung von unbekannten Toten
Die Anwendung stabilisotopenanalytischer Methoden als Werkzeug zur Aufklärung von unklaren Tatbeständen hat sich in der Forensik etabliert. Am Institut für Rechtsmedizin der Universität München gehen Anfragen zu Erstellung von Isotopengutachten aus dem In- und Ausland ein. Der Großteil der Isotopengutachten beantwortet die Frage nach der geogra-phischen Herkunft und den Aufenthaltsorten unbekannter Toter. Die Ergebnisse der Analyse der Stabilisotopenhäufigkeitsverhältnisse von Bio- und Geoelementen in Körpergeweben lie-fern Ansatzpunkte für polizeiliche Ermittlungen. Die Grundidee der geographischen Her-kunftszuordnung von Personen mittels Isotopenanalyse liegt in der Beobachtung, dass über Ernährung und Umwelt unterschiedliche Isotopenverhältnisse chemischer Elemente in den Körper eingebaut werden, die eine regionale Komponente aufweisen (Tabelle). Menschliche Gewebe zeigen dann ebenso bestimmte Isotopensignaturen, über die sich Rückschlüsse auf die Aufenthaltsorte und die Ernährungsweise des Konsumenten ziehen lassen.

Referencias bibliográficas (1)

  • Stabilisotopenanalyse in der Forensik

    Die Anwendung stabilisotopenanalytischer Methoden als Werkzeug zur Aufklärung von unklaren Tatbeständen hat sich in der Forensik etabliert. Am Institut für Rechtsmedizin der Universität München gehen Anfragen zu Erstellung von Isotopengutachten aus dem In- und Ausland ein. Der Großteil der Isotopengutachten beantwortet die Frage nach der geogra-phischen Herkunft und den Aufenthaltsorten unbekannter Toter. Die Ergebnisse der Analyse der Stabilisotopenhäufigkeitsverhältnisse von Bio- und Geoelementen in Körpergeweben lie-fern Ansatzpunkte für polizeiliche Ermittlungen. Die Grundidee der geographischen Her-kunftszuordnung von Personen mittels Isotopenanalyse liegt in der Beobachtung, dass über Ernährung und Umwelt unterschiedliche Isotopenverhältnisse chemischer Elemente in den Körper eingebaut werden, die eine regionale Komponente aufweisen (Tabelle). Menschliche Gewebe zeigen dann ebenso bestimmte Isotopensignaturen, über die sich Rückschlüsse auf die Aufenthaltsorte und die Ernährungsweise des Konsumenten ziehen lassen.

Comunicados de prensa (1)

  • Versatile Ultra Centrifugal Mill with New Cyclone

    RETSCH’s powerful and versatile ZM 200 offers the ultimate in performance and operating comfort. It is used for the rapid size reduction of soft to medium-hard and fibrous materials down to 40 microns. Because of the efficient size reduction technique and the comprehensive range of accessories the ZM 200 ensures the gentle preparation of analytical samples in a very short time.
    For applications which require an optimum air throughput (e. g. heat sensitive materials) or if larger sample volumes need to be processed, the use of a cyclone is recommended. RETSCH offers a re-designed cyclone with improved functionalities for collector volumes from 250 ml to 5 liters which adds to the ZM 200’s great flexibility.
    Thanks to the wide range of accessories with different rotors, ring sieves and collectors, the ZM 200 can be easily adapted to suit a wide range of applications such as, for example, heavy-metal-free grinding, size reduction of abrasive materials or processing small volumes up to 20 ml.

Referencias (5)

Informes de pruebas de laboratorio (47)