homo Definition and 23 Threads

I was trying to understand why some compounds appear colorless (transparent) and tried to give an explanation. I take benzene as an example: it is a chromophore group in which there is π-conjugation, so a certain energy gap is generated between HOMO and LUMO. This energy gap is such that in...

I found this video by a guy involved with the ongoing cave work involved in further work on these interesting Homo fossils (Homo naledi). I think it is 5 years old. This is after the initial reports of their discovery. They found more stuff out. There are a lot cave shots. Very tight places...

An international team of archaeologists exploring the Bacho Kiro (Бачо Киро) cave in Bulgaria since 2015 determined that a molar (tooth) the found is dated to about 44,000-46,000 years old...

The previously oldest H. Erectus fossil was dated 1.85 million years from Georgia. These specimens from South Africa have been dated 200,000 years earlier, pre dating a magnetic 'flip' that occurred in the Earth's magnetic field 1.95 million years ago. This magnetic reversal was one of part of...

A new species of Homo from the Late Pleistocene of the Philippines Florent Détroit, Armand Salvador Mijares, Julien Corny, Guillaume Daver, Clément Zanolli, Eusebio Dizon, Emil Robles, Rainer Grün & Philip J. Piper Naturevolume 568, pages181–186 (2019)...

I just received the results from the DNA tests that I ordered at 23andme.com. According to 23andme, I have 298 Neanderthal variants in my DNA. 23andme says that I have more Neanderthal DNA in my genes than 80% of 23andme customers. This has really gotten me thinking about Neanderthal DNA, and...

What exactly is the absolute highest occupied molecular orbital? I think, as the name suggests, it's the absolute highest occupied molecular orbital in a molecule. Could it be determined using spectroscopy? Maybe, depending on the type. You could use UV-Vis if the energy gap between the HOMO...

This considerably pushes back the timeline for H. Sapiens https://www.nature.com/nature/journal/v546/n7657/full/nature22336.html

It will be interesting to see what comes of this. https://www.yahoo.com/news/homo-naledi-mystery-human-species-091635429.html

I've just recently started relearning chemistry. Forgive me for asking such a basic question, but my textbook doesn't use very practical examples with a detailed explanation. So a hetero and homo mixture can be classified as if there compositions (multiple substances) are blended or not. Let's...

From what I've seen so far, the basis of the solution space for all the constant coefficient homo linear DE's have been linear combinations of the exponential function e or of some polynomial multiplied by the exponential function. Is this always true that these DE's always result in solutions...

Just saw an article on this on facebook: Abstract Homo naledi is a previously-unknown species of extinct hominin discovered within the Dinaledi Chamber of the Rising Star cave system, Cradle of Humankind, South Africa. This species is characterized by body mass and stature similar to...

What differentiates a homo erectus from a neanderthal? They look very similar as they both lack chins and have brow ridges. To me, a neanderthal seems like a large brained homo erectus. Modern human skulls, on the other hand, look completely different. Thanks

Amazing, a piece of creative expression... between 540,000 and 430,000 years old... made by Homo erectus. "The engraving was probably made on a fresh shell specimen still retaining its brown [skin], which would have produced a striking pattern of white lines on a dark ‘canvas'" World’s Oldest...

In diels alder reactions, why does the reaction always occur between the HOMO of the diene, and the LUMO of the dienophile? Well, what I'm really trying to figure out is how to determine which reactant donates the electrons, and which reactant receives them in cycloadditions.

Hi there I have some questions regarding those three things. First off, the antibonding orbital, which I am having a hard time comprehending. So as far as I understand most atoms in organic chemistry have those antibonding orbitals, for instance a carbonyl carbon, where I imagne the...

What is wrong with this logic? Homo Sapien 1. 46 (diploid) chromosomes 2. 32,185 genes 3. 3,079,843,747 bases (DNA bases A,C,T,G) 4. Homo sapines diverged from chimpanzees 6 million years ago. 5. There is a 3% difference in the genetic makeup of a homo sapien and a chimpanzee. 6...

Hi, need help solving a first order homogeneous ODE. y'(x)-(a/x)y = b/(x(1+x)^2) Here a and b are some constants. Need to solve this for y. My attempts so far have been to use But this means solving ∫ x^(-a)/(x(1+x)^2) dx which has solutions in terms of Gauss hyper-geometric functions...

Hi all, Currently, I'm reading the paper: Direct to indirect band gap transition in ultrathin ZnO nanowires under uniaxial compression [APPLIED PHYSICS LETTERS 94, 113114, 2009]. You can download this paper from the following url...

Hi, i have the following non-homo differential equation. y^{\prime\prime}+4y = 2~cos~x + 3x~sin~x \begin{cases} y(0) = 1 \\ y^{\prime}(0) = 2 \end{cases} Since there is a 3x term in front of sin x. What is the form of the solution for this problem? if it hadn't been there it...

Both modern man homo sapiens and the Neandertals homo neanderthalensis are presumed to have evolved from Heidelberg man homo heidelbergensis. Because heidelbergensis is so physically similar to sapiens Heidelberg man was, for a long time, known as Archaic homo sapiens, in which case the...

In another thread there's a discussion of the wavelength limits of the human visual system. A question has arisen re the damage that UV can have on the eye; specifically by wavelength and intensity. Can anyone help? There's tons of material on the internet, but how to judge what's...

:wink: Homo sapiens: A cybernetic life-form, native to the third planet from a medium sized star. Primary food sources: Petroleum oil Ferrous metals Water Trace amounts of organic material :wink: O.k. so I'm kidding, but only partly. Consider; how many of us would starve without...