Chaos has been used to create variations on musical and dance sequences (Dabby, 2008; Bradley & Stuart, 1998). Here, I apply this to birdsong. It could also be used to model the evolution of creative cultural features.... Read more »
Bradley E, & Stuart J. (1998) Using chaos to generate variations on movement sequences. Chaos (Woodbury, N.Y.), 8(4), 800-807. PMID: 12779786
Spencer, K., Wimpenny, J., Buchanan, K., Lovell, P., Goldsmith, A., & Catchpole, C. (2005) Developmental stress affects the attractiveness of male song and female choice in the zebra finch (Taeniopygia guttata). Behavioral Ecology and Sociobiology, 58(4), 423-428. DOI: 10.1007/s00265-005-0927-5
Soma, M., Hiraiwa-Hasegawa, M., & Okanoya, K. (2009) Song-learning strategies in the Bengalese finch: do chicks choose tutors based on song complexity?. Animal Behaviour, 78(5), 1107-1113. DOI: 10.1016/j.anbehav.2009.08.002
Hosino, T., & Okanoya, K. (2000) Lesion of a higher-order song nucleus disrupts phrase level complexity in Bengalese finches. NeuroReport, 11(10), 2091-2095. DOI: 10.1097/00001756-200007140-00007
Every day on the way back from work I walk next to this wall. The other day there were plenty of cannibal Harlequin ladybird larvae eating prepupae. Today there were many more pupae and a few prepupae. I have no idea how I noticed this tiny fly on the head of a prepupa. The ladybird pupa shook its body back and forth to no avail. Later I identified the fly as a scuttle fly, genus Phalacrotophora. Some species of this genus are endoparasites of ladybird pupae. The fly mounts guard on a prepupa and when it pupates it lays some eggs underneath. The fly larvae on hatching parasitise the ladybird and when fully developed they emerge and pupate on the ground. A common hypothesis on the rapid spread of invasive species is the "enemy release" hypothesis. This states that the invaders in the new range lack specific enemies - pathogens, parasites or predators and that this allowes uncheckered population growth. The success of the harlequin ladybird has been hypothesized to depend at least in part on escape from natural enemies. Recent studies indicate that generalist ladybird parasites might be starting to attack this ladybird in the invaded range and this includes pathogenic fungi, and endoparasitic nematode worms, wasps (Dinocampus coccinellae and Oomyzus scaposus) and flies. Prevalence can be quite high, with up to 33% of specimens in Danish samples infected with nematodes, but, on the other hand, lower fitness from the parasitoid Dinocampus reared from Harlequins, suggest than some of these enemies have yet to adapt to this invasive ladybird. If you live in the U.K. there is a survey you can take part into, by collecting ladybird pupae and rearing them, and then reporting what comes out of them (see the Ladybird Parasite Survey website).ReferencesKoyama, S., & Majerus, M. (2007). Interactions between the parasitoid wasp Dinocampus coccinellae and two species of coccinellid from Japan and Britain BioControl, 53 (1), 253-264 DOI: 10.1007/s10526-007-9138-5Kenis, M., Roy, H., Zindel, R., & Majerus, M. (2007). Current and potential management strategies against Harmonia axyridis BioControl, 53 (1), 235-252 DOI: 10.1007/s10526-007-9136-7Durska, E., Ceryngier, P., & Disney, H.L. (2003). Phalacrotophora beuki (Diptera: Phoridae), a parasitoid of ladybird pupae (Coleooptera: Coccinellidae) European Journal of Entomology, 100, 627-630 Other: 1210-5759... Read more »
Koyama, S., & Majerus, M. (2007) Interactions between the parasitoid wasp Dinocampus coccinellae and two species of coccinellid from Japan and Britain. BioControl, 53(1), 253-264. DOI: 10.1007/s10526-007-9138-5
Kenis, M., Roy, H., Zindel, R., & Majerus, M. (2007) Current and potential management strategies against Harmonia axyridis. BioControl, 53(1), 235-252. DOI: 10.1007/s10526-007-9136-7
Durska, E., Ceryngier, P., & Disney, H.L. (2003) Phalacrotophora beuki (Diptera: Phoridae), a parasitoid of ladybird pupae (Coleooptera: Coccinellidae). European Journal of Entomology, 627-630. info:other/1210-5759
With demand for biofuels expected to soar in the coming decades, it’s worth asking whether the environmental benefits of biofuels are really all they’re cracked up to be.
Varied production systems, climates and growing conditions make apples to apples comparisons difficult, but a recent paper, published in Biomass & Bioenergy in January 2010, attempts to answer the question of which biofuel crops are environmentally sustainable.
The analysis considers only commonly used (‘important’) crops already in production. For bioethanol production, the list of crops included maize (U.S.), wheat (Northwest Europe), sugar beet (Northwest Europe), cassava (Thailand), sweet sorghum (China), and sugarcane (Brazil). For biodiesel, they analyzed winter oilseed rape (Northwest Europe), soybean (U.S.), and oil palm (Malaysia).
Researchers developed a method to score each biofuel’s performance in nine different areas: energy yield, energy ratio (to account for soybeans’ high energy yield but low nitrogen inputs), greenhouse gas emissions, soil erosion, soil-borne diseases, nitrogen use efficiency, pesticide usage, and water usage. The factors are weighted equally in the calculation of a single score for each crop. Below are the results for greenhouse gas emissions:
And the winners are: Oil palm (southeast Asia), sugarcane (Brazil), and sweet sorghum (China). The high scores are explained primarily by their “high net energy yields per hectare… which result in good nitrogen use efficiency, pesticide use efficiency and water productivity.”
Coming out in the middle were sugar beet (Northwest Europe), cassava (Thailand), rapeseed (Northwest Europe), and soybean (U.S.). Maize (U.S.) and wheat (Northwest Europe) performed worst in nearly all indicators, including the main goal of these biofuels: “reduction of fossil energy use and GHG emissions.”
The authors suggest that because the tropical crops are so productive, “it may be more sustainable and economically sound for countries in the North to import biofuels from, e.g. Brazil or South East Asia.”
A big caveat, of course, is that this analysis does not include indirect land use change (iLUC), which often can be the difference between a good (GHG-reducing) and a bad (GHG-increasing) biofuel. Indeed, iLUC is a huge concern for two of the ‘winning’ biofuels (oil palm and sugarcane), given their links to deforestation in southeast Asia and Brazil, respectively. The study also did not economic and social sustainability, or the impacts on biodiversity.
Another caveat, according to the researchers, is that “estimates of energy consumption and GHG emissions generally varied widely for all crops, demonstrating that there is still little consensus among authors in this respect.”
de Vries, S., van de Ven, G., van Ittersum, M., & Giller, K. (2010). Resource use efficiency and environmental performance of nine major biofuel crops, processed by first-generation conversion techniques Biomass and Bioenergy, 34 (5), 588-601 DOI: 10.1016/j.biombioe.2010.01.001... Read more »
de Vries, S., van de Ven, G., van Ittersum, M., & Giller, K. (2010) Resource use efficiency and environmental performance of nine major biofuel crops, processed by first-generation conversion techniques. Biomass and Bioenergy, 34(5), 588-601. DOI: 10.1016/j.biombioe.2010.01.001
The journal Applied Geography and the journal Land Use Policy have recently published two papers, “Spatiotemporal modeling of the expansion of mechanized agriculture in the Bolivian lowland forests” and “Deforestation dynamics and policy changes in Bolivia’s post-neoliberal era” respectively, that depict a desolating panorama. The rate of deforestation under Evo Morales’ government is even higher than it was during the previous governments. Muller et al. say that “While overall dynamics remained relatively stable over time, the expansion of mechanized agriculture between 2001 and 2005 became more tolerant to excessive rainfall and less dependent on fertile soils. This mirrors the increasing penetration of mechanized agriculture into humid and less fertile Amazonian rainforests in the northern portion of the study area [Santa Cruz]. The map of deforestation probability substantiates these patterns and shows the highest propensities for future deforestation in the north”, while Redo et al. point out that: “Although neoliberal policies triggered an unprecedented level of forest clearing in Bolivia, rates have generally continued to increase and can be indirectly linked to the administration’s new agrarian reform and pro-environmental regulations”. The “pro-environmental” regulations of Morales’ government have actually increased deforestation rates!The Northern Bolivian lowlands are not only an extremely important reservoir of biodiversity and home of many indigenous communities; they also hold an impressive amount of archaeological sites, most of which have never been studied or surveyed. As deforestation for industrial soybean production is moving northward, it now starts to affect the Llanos de Moxos, where most of these archaeological sites are found. Soy producers cut down the trees using bulldozers, and, in this way, they also destroy all the archaeological sites they encounter on the way. In the eastern Llanos de Moxos, in a stripe of forest called Monte San Pablo, between the River Cocharca and the River San Pablo (Fig. 1), Bolivian Mennonites are bulldozing pre-Columbian human-made earth mounds, which hold valuable remains and information about past Amazonian cultures. The destruction of pre-Columbian archaeological sites in the Bolivian Amazon is taking place while national and local governments look another way, and regrettably, with the complicity of some of the indigenous leaders who live in the area. Figure SEQ Figure \* ARABIC 1 Shaded areas are forests. Continuous line indicates the area of pre-Columbian monumental mounds. Monte San Pablo is east of the area (dashed lines) shown in Fig.2. (Lombardo and Prümers, 2010)Figure 2. Modis Image taken a few days ago. The yellow stripes highlighted by the arrow are the portions of Monte San Pablo that have already been cleared for soybean production. The deforested area is already larger than 10.000 hectaresI have surveyed more than one hundred pre-Columbian monumental mounds and hundreds of Km of pre-Columbian canals and causeways in the area east of Trinidad, in the Beni (see map in fig.3). The monumental mounds are huge earthworks (the average mound covers 5 hectares and is 9 meters high) entirely human made, built from 400 AD to 1500 AD. They are full of pottery and burials and only very few of them have been excavated by archaeologists. The Monte San Pablo, just east of the area I surveyed, is full of monumental mounds. Those are the mounds that are being destroyed by the Mennonite bulldozers to make room for soybeans.... Read more »
Daniel Redo, Andrew C. Millington, & Derrick Hindery. (2011) Deforestation dynamics and policy changes in Bolivia’s post-neoliberal era. Land Use Policy. info:/10.1016/j.landusepol.2010.06.004
Robert Müller, Daniel Müller, Florian Schierhorn, & Gerhard Gerold. (2011) Spatiotemporal modeling of the expansion of mechanized agriculture in the Bolivian lowland forests. Applied Geography. info:/10.1016/j.apgeog.2010.11.018
Umberto Lombardo, & Heiko Prümers. (2010) Pre-Columbian human occupation patterns in the eastern plains of the Llanos de Moxos, Bolivian Amazonia. Journal of Archaeological Science. DOI: 10.1016/j.jas.2010.02.011
Mycology, the study of fungi, is an often-overlooked member of the microbiology family. Having said that there are plenty of dedicated mycologists out there doing all sorts of cool stuff and plenty more fungal species doing all sorts of weird and wonderful things.... Read more »
King-Fai Cheng, & Ping-Chung Leung. (2008) General review of polysaccharopeptides (PSP) from C. versicolor: Pharmacological and clinical studies. Cancer Therapy. info:/
Luk SU, Lee TK, Liu J, Lee DT, Chiu YT, Ma S, Ng IO, Wong YC, Chan FL, & Ling MT. (2011) Correction: Chemopreventive Effect of PSP Through Targeting of Prostate Cancer Stem Cell-Like Population. PloS one, 6(6). PMID: 21674070
In early 2000, a team of Filipino and American scientists headed by L.R. Heaney conducted a comprehensive survey of Luzon mammals. Recently, they presented seven new species in the genus Apomys which were identifed from this expedition. They also proposed a new subgenus Megapomys based on the morphological and DNA data of the 10 already known species and the 7 new ones.... Read more »
Heaney, L., Balete, D., Rickart, E., Alviola, P., Duya, M., Duya, M., Veluz, M., VandeVrede, L., & Steppan, S. (2011) Chapter 1: Seven New Species and a New Subgenus of Forest Mice (Rodentia: Muridae: Apomys) from Luzon Island. Fieldiana Life and Earth Sciences, 1-60. DOI: 10.3158/2158-5520-2.1.1
This thursday the Swedish Centre for Animal Welfare (SCAW) at the Swedish University of Agricultural Sciences published a report dealing with wether or not fish can feel pain and if they can suffer. This is getting more and more relevant as more people become aware of what they eat and do not want to cause unnecessary suffering to the animal being put on the dinner table. In a few blog post starting from this i will discuss the different articles cited in this report about fish welfare. Sadly its only available in swedish but if you know swedish heres the link: http://www.slu.se/Documents/externwebben/centrumbildningar-projekt/scaw/Fiskkonferens/Kan-fiskar-kanna-smarta-och-eller-uppleva-lidande.pdfThe authors of the report discuss several reviews and articles some of them giving contradictory conclusions in this question. Nociceptors seem to be present in some invertebrates and most if not all vertebrates. They are important instruments in sensing and reacting to various harmful stimuli. Pain on the other hand is the "feeling" we often refer to in our daily life. The feeling of pain is processed in the neocortex in humans. Fish which lacks the layered cortex present in mammals are according to some researchers not able to have the "feeling" of pain. This would mean that they would just react to a painful stimuli and not learn to avoid it since it would be more of a reflex response rather than a response that have been processed in the higher brain centers. Is this the case for fish, do they only react by a reflex to a harmful stimuli or do they process such stimuli in the brain and perceive the feeling of pain? The authors of the report give several examples of different studies on this and one of them caught my attention. This was a study done by Dunlop & Laming in 2005 showing an activation of several brain areas including telencephalon in both goldfish and rainbow trout as response to given mechanoceptive and nociceptive stimuli. One of the criteria for determining if a animal feel pain is the presence of receptor cells that link to forebrain areas, a criteria which would be fulfilled if their results is correct. To investigate wether or not the nociceptive cells link to forebrain areas of these two species they removed the bone covering the top of the skull on the fish and inserted electrodes in the spinal cord, cerebellum, tectum and telencephalon. Then they gave both mechanoceptive and nociceptive stimuli on the sides of the fish. They recorded responses in all brain areas included to both types of stimuli. In goldfish the nociceptive stimuli yielded a larger response than the mechanoceptive stimuli in the brain while they did not differ in the rainbow trout.What their study show is that the response to nociceptive stimuli in these fish are not based solely on reflexes alone since the forebrain, not only the spinal cord, is activated upon stimulation. In telencephalon some of the structures suggested to be homologous to hippocampus and amygdala of tetrapod brains are located, which would imply a processing of these stimuli in the brain to in the future avoid these harmful experiences. Other studies have shown that fish seem to remember and do not bite a fishing hook a second time other than if it is food deprived. Then it might be the only way for the fish to find food at the moment and they have to bite the hook a second or third time. Taken together this data would suggest at least that fish are somewhat able to "feel" pain and remember it to avoid being in this situation in the future.In my next blog post I will continue to discuss fish welfare, and focus a bit of stress and how that affect fish during sport fishing. References:Dunlop R, & Laming P (2005). Mechanoreceptive and nociceptive responses in the central nervous system of goldfish (Carassius auratus) and trout (Oncorhynchus mykiss). The journal of pain : official journal of the American Pain Society, 6 (9), 561-8 PMID: 16139775... Read more »
Dunlop R, & Laming P. (2005) Mechanoreceptive and nociceptive responses in the central nervous system of goldfish (Carassius auratus) and trout (Oncorhynchus mykiss). The journal of pain : official journal of the American Pain Society, 6(9), 561-8. PMID: 16139775
Everyone knows the experience: you happen upon a wreck and know you shouldn’t look but can’t help it. You know there is a chance of seeing something you don’t want to see and which may haunt you, but you look regardless. There should be a word for this and in the absence of one, I [...]... Read more »
Reser, Jared E. (2011) Conceptualizing the Autism Spectrum in Terms of Natural Selection and Behavioral Ecology: The Solitary Forager Hypothesis. Evolutionary Psychology, 9(2), 207-238. info:/
Do you ever get to the point where you feel as though you and your partner have absolutely nothing in common? Read further to find out the one common thread that lies in almost all of us. ... Read more »
Ramachandran, V. S. . (2001) Synaesthesia - a window into perception, thought and language. Journal of Consciousness Studies, 3-34. info:/
I was recently asked about a volume descriptor in Bioclipse, which is not yet available. Jmol can calculate surfaces, so that was my first thought. However, I then ran into a paper from 2003 by Zhao, called Fast Calculation of van der Waals Volume as a Sum of Atomic and Bond Contributions and Its Application to Drug Compounds (doi:10.1021/jo034808o).
The paper presents a very simple mathematical model, which approximates the molecular volume by a sum of atomic contributions, and a three terms to correct for atom-atom overlap, via the number of bonds, and corrections based on the number or aromatic and non-aromatic rings. The paper is clearly written, and the mathematics simple.
One problem with the publication though, are the numbers in the main text. They are wrong. I started of using the coefficients of the equations presented in the paper, but very soon ran into problems when I was writing up unit tests based on the volumes for compounds given as examples. In fact, the numbers in the main text are internally inconsistent. Not good. I believe it is partly caused by rounding, but that does not correct for the differences fully.
Fortunately, the Excel sheet in the supplementary information has the exact numbers, and those are numerically consistent.
The paper has been cited 46 times now, so, a fast volume descriptor seems relevant indeed. I am not sure how fast it will propagate to Bioclipse, as I do not have time soon to update the CDK version of Bioclipse (the major part of which is to ensure the Bioclipse-JChemPaint editor does not get broken, again).
Another thought about this paper, is that it is using the evil aromaticity concept, where the authors forgot to mention when they consider a ring to be aromatic.
Zhao, Y., Abraham, M., & Zissimos, A. (2003). Fast Calculation of van der Waals Volume as a Sum of Atomic and Bond Contributions and Its Application to Drug Compounds The Journal of Organic Chemistry, 68 (19), 7368-7373 DOI: 10.1021/jo034808o... Read more »
Zhao, Y., Abraham, M., & Zissimos, A. (2003) Fast Calculation of van der Waals Volume as a Sum of Atomic and Bond Contributions and Its Application to Drug Compounds. The Journal of Organic Chemistry, 68(19), 7368-7373. DOI: 10.1021/jo034808o
Planning on committing a crime anytime soon? You'd better be careful not to leave your DNA behind. If crime scene investigators can collect any hair, skin cells, blood, or other bits of you from the crime scene, they'll have a pretty convincing case against you once you're in custody. Unless, of course, you have an identical twin. If that's the case, commit all the crimes you want, because there is absolutely no way for scientists to tell the difference between your DNA and your twin's.According to a new study from the Czech Republic, though, a dog can do one better than a DNA technician. A group of trained German shepherds were able to reliably tell apart the scents of identical twins.The study used four sets of twins, two identical and two non-identical. The identical twins were 5 and 7 years old, and the others were 8 and 13. The researchers used children because they wanted to give the dogs the greatest challenge possible: telling apart two people with identical genes who live in the same environment and eat the same food. As twins get older and develop different eating habits, move into different homes, and perhaps face different health problems, their personal scents will presumably grow apart. But identical twin children are just about as similar as two humans can get.The German shepherds were police dogs trained in scent matching. This is a forensic technique used in a few European countries such as Russia, Poland, and Denmark, but not used in the United States. A dog is given a scent sample from the crime scene to sniff. Then the dog is led to a scent line-up: a row of seven identical glass jars, each holding a piece of cotton. The dog sniffs every jar, and if it finds one that matches the crime scene scent, it alerts its handler by lying down next to that jar.Ten dogs participated in the study. Each trial was like the normal scent line-ups the dogs were used to. A dog sniffed a piece of cotton, then checked for a match among seven possibilities. Every dog consistently matched the humans to their scents, regardless of whether the human was an identical twin. If a dog sniffed Twin A and Twin A was in the lineup, the dog chose that jar. But if a dog sniffed Twin A and only Twin B was in the lineup, it walked right past. They never made a mistake.(In case you're wondering how scientists bottle a person's smell, the answer is: belly skin. The kids held scent-absorbing cotton pads against their bellies for 20 minutes to create a kind of smell swatch.)In earlier studies, researchers had found that dogs have trouble smelling the difference between identical twins. The dogs in this study succeeded because they've been highly trained by the police. It's not an easy task--and that means our genes must have a lot of responsibility for our personal scents. The differences in the children's scents must have come from very small variations in their lifestyles. Maybe one twin has a greater preference for peanut butter, or one twin likes to exercise more and has a different metabolism.Not much is known about why people smell the way they do. It would be interesting to see a follow-up study using a larger group of twins at different ages. Do three-year-old twins smell different? Do some ten-year-old twins smell exactly the same? Is there any way for newborn twins to not smell identical? If we weak-nosed humans had a better understanding of the scents that come from our bodies, it might give us new tools for medical diagnoses. (Here, for example, is a story about a woman who detected her husband's hidden disease based on a change in how his breath smelled.)In this country, perhaps we should consider giving dogs a larger role in forensic investigations. As long as identical-twin criminals don't strike, DNA is still a reliable and (usually) convincing form of evidence. But it's easy for us to forget that other animals have access to a whole layer of information we can't begin to decode.Ludvík Pinc (2011). Dogs Discriminate Identical Twins PLoS ONE : 10.1371/journal.pone.0020704... Read more »
Ludvík Pinc. (2011) Dogs Discriminate Identical Twins. PLoS ONE. info:/10.1371/journal.pone.0020704
Each Friday, I share a collection of stories, research, or other news and notes related to the role of feedback in complex systems that catch my attention during the previous week. Most of these I share on twitter when I … Continue reading →... Read more »
Hill, A., Rand, D., Nowak, M., & Christakis, N. (2010) Emotions as infectious diseases in a large social network: the SISa model. Proceedings of the Royal Society B: Biological Sciences, 277(1701), 3827-3835. DOI: 10.1098/rspb.2010.1217
Fowler JH, & Christakis NA. (2008) Dynamic spread of happiness in a large social network: longitudinal analysis over 20 years in the Framingham Heart Study. BMJ (Clinical research ed.). PMID: 19056788
Christakis NA, & Fowler JH. (2007) The spread of obesity in a large social network over 32 years. The New England journal of medicine, 357(4), 370-9. PMID: 17652652
It works against mosquitoes... can it work against bedbugs? A study in Nat...... Read more »
A study in Nature this month reveals a promising new line of defense against disease-carrying, bloodthirsty critters, namely the mosquito. The new line of defense is based on smelly chemicals, or inhibitory odorants, that disrupt the mosquito's ability to detect and travel towards human breath. Mosquitoes, as well as other blood-feeding insects, are attracted towards the carbon dioxide that we exhale with every breathe cycle (oxygen in, carbon dioxide out).... Read more »
The "monstrous heavy one" was stout, armored and may have supported huge spikes on its neck and shoulders... Read more »
Carpenter, K.; Bartlett, J.; Bird, J.; Barrick, R. (2008) ANKYLOSAURS FROM THE PRICE RIVER QUARRIES, CEDAR MOUNTAIN FORMATION (LOWER CRETACEOUS), EAST-CENTRAL UTAH. Journal of Vertebrate Paleontology, 28(4), 1089-1101. DOI: 10.1671/0272-4634-28.4.1089
“Using SNP array analysis, we found that a region of chromosome segment 8p11-12 containing three genes–WHSC1L1, LETM2, and FGFR1–is amplified in 3% of lung adenocarcinomas and 21% of squamous cell lung carcinomas.” Dutt et al., (2011) This snippet from a … Continue reading →
... Read more »
Dutt A, Ramos AH, Hammerman PS, Mermel C, Cho J, Sharifnia T, Chande A, Tanaka KE, Stransky N, Greulich H.... (2011) Inhibitor-Sensitive FGFR1 Amplification in Human Non-Small Cell Lung Cancer. PloS one, 6(6). PMID: 21666749
I guess you could say that I have been programmed to notice giant creepy crawly things. Starting when my son brought home a book about “Real Life Monsters”, my family has not been able to stop talking about one of the book’s featured monsters, the Goliath Bird Eater spider. While the book’s other stars, the [...]... Read more »
Archibald SB, Johnson KR, Mathewes RW, & Greenwood DR. (2011) Intercontinental dispersal of giant thermophilic ants across the Arctic during early Eocene hyperthermals. Proceedings. Biological sciences / The Royal Society. PMID: 21543354
The first in a series on hormonal contraception. This post explores why human women menstruate and how that may impact their contraceptive decisions.... Read more »
Jasienska, G., & Thune, I. (2001) Research pointers: Lifestyle, hormones, and risk of breast cancer. BMJ, 322(7286), 586-587. DOI: 10.1136/bmj.322.7286.586
Strassmann, B. (1997) The Biology of Menstruation in Homo Sapiens: Total Lifetime Menses, Fecundity, and Nonsynchrony in a Natural-Fertility Population. Current Anthropology, 38(1), 123. DOI: 10.1086/204592
Vitzthum VJ, Spielvogel H, Caceres E, & Miller A. (2001) Vaginal bleeding patterns among rural highland Bolivian women: relationship to fecundity and fetal loss. Contraception, 64(5), 319-25. PMID: 11777494
Vitzthum VJ, & Ringheim K. (2005) Hormonal contraception and physiology: a research-based theory of discontinuation due to side effects. Studies in family planning, 36(1), 13-32. PMID: 15828522
My dad knows nothing about our ancestors so I thought some family history would be perfect for a father’s day present. After a quick scan of genealogy sites I discovered that according to folklore the Ó Dálaigh (Daly) clan were descendents of the 5th century warlord Niall of the Nine Hostages. This meant they were part of the Úi Néill (descendents of Niall), a lineage of high kings of Ireland. An excellent start to my quest but being more interested in science than trailing through the archives, I turned to genetics.... Read more »
Moore, L., McEvoy, B., Cape, E., Simms, K., & Bradley, D. (2006) A Y-Chromosome Signature of Hegemony in Gaelic Ireland. The American Journal of Human Genetics, 78(2), 334-338. DOI: 10.1086/500055
Forstmeier W, Martin K, Bolund E, Schielzeth H, & Kempenaers B. (2011) Female extrapair mating behavior can evolve via indirect selection on males. Proceedings of the National Academy of Sciences of the United States of America, 108(26), 10608-13. PMID: 21670288
Brain overgrowth has been noted among children with autism spectrum disorder (ASD). Now, a new imaging study suggests that the accelerated brain growth appears before 2 years of life, offering new avenues for early identification and intervention of ASD. Investigators conducted a longitudinal magnetic resonance imaging (MRI) study of 59 children with ASD and 38 [...]... Read more »
Cheng Y, Chou KH, Fan YT, & Lin CP. (2011) ANS: Aberrant Neurodevelopment of the Social Cognition Network in Adolescents with Autism Spectrum Disorders. PloS one, 6(4). PMID: 21541322
Courchesne E, Campbell K, & Solso S. (2011) Brain growth across the life span in autism: age-specific changes in anatomical pathology. Brain research, 138-45. PMID: 20920490
Courchesne E, Carper R, & Akshoomoff N. (2003) Evidence of brain overgrowth in the first year of life in autism. JAMA : the journal of the American Medical Association, 290(3), 337-44. PMID: 12865374
Hazlett HC, Poe MD, Gerig G, Styner M, Chappell C, Smith RG, Vachet C, & Piven J. (2011) Early brain overgrowth in autism associated with an increase in cortical surface area before age 2 years. Archives of general psychiatry, 68(5), 467-76. PMID: 21536976
Redcay E, & Courchesne E. (2005) When is the brain enlarged in autism? A meta-analysis of all brain size reports. Biological psychiatry, 58(1), 1-9. PMID: 15935993
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