Chimpanzees

Meat for sex in wild chimpanzees

This release is available in German . Wild female chimpanzees copulate more frequently with males who share meat with them over long periods of time, according to a study led by researchers from the Max Planck Institute for Evolutionary Anthropology in Germany, published in the open-acces...

Virginia Tech researchers find human virus in chimpanzees

Blacksburg, Va. -- After studying chimpanzees in the wilds of Tanzania's Mahale Mountains National Park for the past year as part of a National Science Foundation (NSF) grant, Virginia Tech researcher Dr. Taranjit Kaur and her team have produced powerful scientific evidence that chimpanzees are be...

Male Chimpanzees find Older Females Sexy

When it comes to mating, male chimpanzees have the opposite taste when compared to the males of one of their nearest biological species, human beings, //according to a study published Tuesday. Unlike human males who prefer younger mates, male chimpanzees like older females and turn up their no...

Yerkes researchers propose ambitious new strategies for AIDS vaccine research

...iency viruses (HIV-1 and HIV-2). More than 40 species of African monkeys are infected in the wild with SIVs. Yet, virtually none with the exception of chimpanzees progresses to HIV/AIDS or gets sick. Evolution has enabled them to adapt to SIVs and co-exist peacefully with chronic infection. "Nature is giving ...

AIDS-like Illness Found in African Chimps

... The researchers already knew that apes could develop an HIV-like virus, but it generally didn't appear to actually cause illness. But they found that chimpanzees did, in fact, get sick. The finding allows an examination of AIDS "from a different angle," said study co-author Dr. Beatrice Hahn, "and that usual...

Evolution May Have Made Humans More Cancer Prone

...ys a Georgia Institute of Technology researcher who found that the genes of chimpanzees are better than those of humans at apoptosis, or programmed cell death -- o... "The results from our analysis suggest that humans aren't as efficient as chimpanzees in carrying out programmed cell death," he said in a Georgia Tech news rele...

Dogs Get Petty About Treats

...y of Vienna in Austria, it had once been believed that this trait belonged only to humans. But previous studies have suggested capuchin monkeys and chimpanzees also express resentful behavior when there's not equal pay for equal work. However, in these species, the quality of the reward did matter. Other...

Color Red Makes Men Amorous

...searchers, who noted that previous studies found that nonhuman male primates are particularly attracted to females displaying red. For example, female chimpanzees and baboons redden when nearing ovulation -- a clear sexual signal to males. "Our research demonstrates a parallel in the way that human and nonhum...

HIV Outbreak Began Decades Earlier Than Thought

...nd what factors allowed the virus to enter and become a successful human pathogen," said Worobey. Previous studies have shown that HIV spread from chimpanzees to humans in southeastern Cameroon. Worobey said that the HIV epidemic that resulted from the turn-of-the-century spread correlates to the urbaniza...

Surgeon operates to rescue chimp with rare deformity

...arm severely bent. Vets have seen the deformity in dogs before but never in chimpanzees and were called in to assess Janets condition. Rob Pettitt, orthopaedic ... chimps as pets is illegal but rife on the black market in Cameroon. Adult chimpanzees are slaughtered for their meat and the young chimps are then taken away and...

Chimpanzees in Medical Technology

Research Attributes Lack of HIV/AIDS Vaccine to Use of Chimpanzees

BOSTON, Oct. 6 /PRNewswire-USNewswire/ -- "A return to the use of chimpanzees in AIDS research and vaccine development is without scientific justification," according to a paper released today in the journal Alternatives to Laboratory Animals (ATLA). "An Assessment of the Role of Chimpanzees i...

Scientists Discover Origin of Malaria

...l now, malaria's origin had been unclear. Although chimpanzees were known to harbor a parasite, called Plasmodiu... his colleagues sampled wild and wild-born captive chimpanzees in Cameroon and Ivory Coast. In Cameroon researchers collected samples from chimpanzees during routine health exams in three different wil...

Idenix Pharmaceuticals Advances HCV Discovery Program to Clinic

... log10 after four days of dosing. "The in vitro antiviral activity of IDX184 combined with the marked viral load reductions observed in HCV-infected chimpanzees support the potential for once-a-day, low milligram dosing of IDX184 in HCV-infected patients," said David Standring, Ph.D., executive vice president ...

Idenix Pharmaceuticals Provides Update on Hepatitis C Pipeline at JP Morgan Healthcare Conference

...ample, in preclinical studies our second-generation polymerase inhibitor, IDX184, delivered multi-log viral load reductions in HCV genotype-1 infected chimpanzees in just 4 days -- on par with the antiviral activity reported to date from protease inhibitors currently in development." Sommadossi continued, "In ...

Chimpanzees in Medical Dictionary

Sperm

..., quality and quantity of ... Only one sperm among all of the billions within her vaginal tract and uterus can ... This sperm competition in chimpanzees has necessitated the evolution of ... Sperm retrieval techniques have given hope to men with obstructive and ... Adequate numbers of sperm are...

Retrovirus

...enetic material of retroviruses consists of ribonucleic acid (RNA), instead ... ... 2007 — Human resistance to a retrovirus that infected chimpanzees and other ... It is believed that retroviruses have been entering the genome for many millions ... Retrovirus . ... retrovirus . n. ... Retro...

Head lice

...oparasite of humans. Head lice are wingless insects spending their entire life on human scalp and feeding exclusively on human blood. Humans and chimpanzees are the only known host of this... Head louse treatment and solutions that every parent and doctor should know! head lice olive oil safe...

Chimpanzees in Biological News

Wild chimpanzees appear not to regularly experience menopause

CAMBRIDGE, Mass. -- A pioneering study of wild chimpanzees has found that these close human relatives do not routinely experience menopause, rebutting previous studies of captive individuals which had postulated that female chimpanzees reach reproductive senescence at 35 to 40 years of age. Tog...

Genetic differences between yeasts greater than those between humans and chimpanzees

The mapping of the entire yeast genome in 1996 marked the beginning of a revolution in biological and medical research. The human genome was mapped in 2001, and by now the number of characterised species is approaching 1000, most of which are bacteria. The next advance is only a few years away ma...

Key 'impact hunters' catalyze hunting among male chimpanzees

CAMBRIDGE, Mass., Feb. 1, 2008 While hunting among chimpanzees is a group effort, key males, known as impact hunters are highly influential within the group. They are more likely to initiate a hunt, and hunts rarely occur in their absence, according to a new study. The findings, which appear in ...

Fair play in chimpanzees

This release is also availabe in German . In the ultimatum game - which was developed by another German, Werner Güth, now at the Max Planck Institute for Economics in Jena - one person, the proposer, is given money by an experimenter. That proposer can then divide the "manna from heave...

New collaborative research reveals chimpanzees can sustain multiple-tradition cultures

Scientists have long wondered if local animal cultures exist, and now, based on findings by researchers at the Yerkes National Primate Research Center at Emory University, the University of Texas and St. Andrews University, Scotland, they have their answer: Yes. The study, available in today’s ...

Male chimpanzees prefer mating with old females

Researchers studying chimpanzee mating preferences have found that although male chimpanzees prefer some females over others, they prefer older, not younger, females as mates. The findings uncover a stark contrast between chimpanzee behavior and that of humans, their primate cousins. The basis for ...

Retrovirus struck ancestors of chimpanzees and gorillas millions of years ago, but did not affect ancestral humans

The ancestors of chimpanzees and gorillas were infected with a deadly retrovirus about three to four million years ago, but there is no evidence it infected ancestors of modern-day humans, according to research by genome scientists. The virus struck after humans had split off the evolutionary tree ...

Humans related to orangutans, not chimps, says new Pitt, Buffalo Museum of Science study

...ns, and early apes belong to a group separate from chimpanzees and gorillas. They then constructed a scenario for...impanzees, gorillas, and orangutans). Gorillas and chimpanzees shared 11 unique characteristics. Schwartz and ...himpanzee similarities, Schwartz and Grehan write. chimpanzees and gorillas were found to share only those featur...

Cancer: The cost of being smarter than chimps?

...urnal. "I was always intrigued by the fact that chimpanzees appear to have lower rates of cancer than humans,"...mans do not "self-destroy" cells as effectively as chimpanzees do. Apoptosis is one of the primary mechanisms by ...nalysis suggest that humans aren't as efficient as chimpanzees in carrying out programmed cell death. We believe ...

Researchers shed light on trading behavior in animals -- and humans

...cientist Michael Beran conducted a study to see if chimpanzees spontaneously bartered foods among each other, usi...nt from human experimenters, trade disappeared. chimpanzees are known to trade services, such as grooming for ...nd so are familiar with each others' behavior. The chimpanzees thus know whether the risk is likely to pay off, a...

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Chimpanzees in Biological Technology

Idenix Pharmaceuticals Reports Data From Three Hepatitis C Development Programs at the 44th Annual Meeting of the European Association for the Study of the Liver

...nhibitors, interferon or ribavirin. IDX184 has been evaluated in a seven-day study in HCV-infected chimpanzees, in which six genotype-1 infected chimpanzees received 10 mg/kg of IDX184 daily for four days. Data presented at EASL confirm a pharmacokinetic/pharmacodynamic (PK/PD) relationship between nucleos...

Idenix Announces Data Presentations from Three HCV Discovery and Development Programs at the 44th Annual Meeting of the European Association for the Study of the Liver (EASL)

...VITY OF THE LIVER-TARGETED NUCLEOTIDE HCV POLYMERASE INHIBITOR IDX184 CORRELATES WITH TROUGH SERUM LEVELS OF THE NUCLEOSIDE METABOLITE IN HCV-INFECTED chimpanzees - Abstract #583; Oral presentation; Parallel session entitled: Hepatitis C Virus Drug Development II; Session date: Friday, April 24, 2009; Session ...

The birth of biotech: San Francisco, Boston, Geneva or Chicago?

...for the first time. 1971: First complete synthesis of a gene. 1972: The DNA structure of a human is discovered to be 99 percent similar to that of chimpanzees and gorillas. 1973: Stanley Cohen and Herbert Boyer perfect techniques to cut and paste DNA and reproduce new DNA in bacteria. 1974: The National ...

Delivery of pCMV-S DNA Using the Helios Gene Gun System Is Superior to Intramuscular Injection in Balb/c Mice

...vaccine to neuraminidase, Vaccine 18, 32143222 (2000) Davis HL et al., DNA vaccine for hepatitis B: evidence for immunogenicity in chimpanzees and comparison with other vaccines, Proc Natl Acad Sci USA 93, 72137218 (1996) Fynan EF et al., DNA vaccines: protective immunizat...

Chimpanzees in Biological Definition

Human

...uperfamily of Hominoidea , with all of the apes: chimpanzees , gorillas , orangutans , and gibbons . Huma...mo , although some argue that the two species of chimpanzees should be reclassified from Pan troglodytes a...flection as an image of itself — along with chimpanzees or bonobos , orangutans , and dolphins . Human...

Major histocompatibility complex

... many of these alleles are quite ancient: it is often the case that an allele from a particular HLA gene is more closely related to an allele found in chimpanzees than it is to another human allele from the same gene! The allelic diversity of MHC genes has created fertile grounds for evolutionary biologists. ...

Y chromosome

... of the relatively few genes it carries. Findings were confirmed by comparing similar regions of the Y chromosome in humans to the Y chromosomes of chimpanzees , bonobos (the pygmy chimpanzee) and gorillas . The comparison demonstrated that the same phenomenon of gene conversion appeared to be at work more...