Tree of Life Web Project
Biologija.com.hr - Vijesti - Biologija - Evolucija vidljiva tijekom samo jedne generacije
Idući puta kada se nađete u prirodi dobro se osvrnite oko sebe. Ne samo da uživate u aktivnostima izvan kuće već vjerojatno svjedočite i evoluciji koja vam se odvija pred očima. Novo istraživanje objavljeno u časopisu Science početkom ovog mjeseca, a koje se bavi utjecajem kukaca na populacije biljaka, pokazalo je da se evolucija može dogoditi puno brže nego što se prije pretpostavljalo, čak tijekom samo jedne generacije. Znanstvenici sa Sveučilišta u Torontu, zajedno a suradnicima, izveli su eksperiment koristeći dvogodišnju pupoljku (Oenothera biennis), tipičnu samooprašivajuću biljku koja producira genetički identične potomke. Biljke su posadili na dva polja od kojih je svako u početku sadržavalo 60 biljaka sa 18 različitih genotipova (biljke koje sadrže različite setove mutacija). >>> Istraživanja na algama mijenjaju poznatu evoluciju biljaka Rezultati pokazuju da bi evolucija mogla biti važan mehanizam koji uzrokuje promjene u cijelom ekosustavu. Izvor: e!
Capsula interna
Die Capsula interna (deutsch: innere Kapsel) ist die größte Ansammlung von Nervenfasern, die zur Großhirnrinde aufsteigen oder von der Großhirnrinde absteigen. Anatomie[Bearbeiten] Horizontalschnitt durch das Vorderhirn, Basalganglien blau Anatomisch wird die Capsula interna innen von Thalamus und Nucleus caudatus, außen von Globus pallidus und Putamen begrenzt. Im Horizontalschnitt sind ein Crus anterius (vorderer Schenkel), ein Crus posterius (hinterer Schenkel) und das die beiden Schenkel verbindende Genu capsulae internae (Knie) zu erkennen. Folgende wichtige Bahnen ziehen durch die Capsula interna und verbinden so die Großhirnrinde mit tiefer liegenden Strukturen beziehungsweise dem Rückenmark: Im Crus anterius verlaufen: Tractus frontopontinusvorderer Thalamusstiel Im Genu verläuft: Tractus corticonuclearis Im Crus posterius verlaufen: Tractus corticospinalis (Pyramidenbahn)Tractus temporopontinusoberer Thalamusstielhinterer ThalamusstielTeile der Hör- und Sehbahn (untere Capsula interna)
Homo erectus - H. erectus is a well known hominid
IntroductionThroughout the early years of paleoanthropology, there were only two different species that were attributed to the genus Homo. These included the Neanderthals, and Homo erectus. In the early 1960s, this began to change, and human ancestry seemed to be populated by many different players. Accordingly, erectus is one of the better-known members of genus Homo, especially in terms of its well-established place in paleoanthropology. Some (e.g., M. The species was named by Eugène Dubois (it was originally designated as Pithecanthropus erectus) in 1894, after his 1891 find from Trinil, Java, in Indonesia (Trinil 2). The material was later associated with the Chinese material from Zhoukoudian, and renamed Homo erectus. Diagnostic Features The dates for erectus have become earlier and earlier, while habilis remains have been found in later and later deposits, making a lineage involving habilis ancestral to erectus increasingly unlikely. Bibliography Bräuer, G., and E.
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CDC Releases Information about Ebola and Pets
Americans love their pets. After Spanish authorities euthanized the dog of a nurse who contracted Ebola, many US pet owners became understandably concerned. When news leaked that an American nurse in Dallas with Ebola also had a dog, pet owners really got nervous. The Internet lit up with speculations, myths, and lots of wrong information regarding Ebola virus and animals. Veterinarians, including Dr. Jeff Werber and myself (among others), did their best to provide accurate and timely information, but blogs and social media can only do so much. How Ebola virus is spreadThe CDC is clear that a human or animal must be showing signs of Ebola in order to spread the infection. Through a cutThrough mucous membranes lining the eyes, nose, or mouthIn body fluids such as urine, saliva, vomit, feces, semen, and breast milkBy needles and syringes According to the CDC, Ebola has not been found to be transmitted through the air or in water. Can Dogs Get Ebola? Can I get Ebola from my dog or cat?
