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Tag: "germ" at biology news

Researchers track how spores break out of dormant state

...microscopy (AFM) the alterations of spore coat and germ cell wall that accompany the transformation from a spore to a vegetative cell. When starved of nutrients Bacillus (rod-shaped bacteria) cells initiate a series of genetic, biochemical and structural events that result in the formation of metabolical...

Studies to find better ways to preserve human eggs, ovarian tissue under way

...are looking for ways to ensure there are no cancer germ cells in salvaged tissue. If all goes as hoped with this study, the next step will have Drs. Song and Emmi taking ovarian tissue from cancer patients, vitrifying it then, after they are sure it’s cancer-free, re-implanting it when the woman is re...

Early-stage sperm cells created from human bone marrow

...l stem cells, which are an early phase of the male germ cell development. In most men, spermatagonial cells eventually develop into mature, functional sperm but this progression was not achieved in this experiment. Earlier research led by Prof Nayernia using mice, published in Laboratory Investig...

DNA ends: Common tool, different job

...ular senescence. In certain cells, such as our germ cells or baker's yeast cells, which need to divide indefinitely, an enzyme called telomerase elongates telomeres to compensate for the continual attrition at chromosome ends. At the same time, telomerase activity is the main mechanism by which human ...

Study of planarians offers insight into germ cell development

...eyed flatworm is an ideal subject for the study of germ cells, precursors of eggs and sperm in all sexuall... help scientists tease out the mechanisms by which germ cells are formed and maintained. Newmark’s team made a few discoveries related to a gene, called nan...

Origen publishes in Nature a robust and versatile method for creating transgenic chickens

...gh came when we turned our attention to primordial germ cells, the precursor cells to sperm and eggs," sai...utic proteins in their eggs. The use of primordial germ cells, the ease of producing small or large flocks of chickens, and the existing infrastructure for ...

New research: Soy germ isoflavones reduce bone loss

...opausal women and the dose-dependent effect of soy germ isoflavones, particularly SoyLife®. These findings...romising research is another step in advancing soy germ isoflavones as a safe, effective option," said Jocelyn Mathern, RD and Technical Specialist, Acatris...

Sperm created in the laboratory from embryonic stem cells produce viable progeny

...n the laboratory can differentiate into primordial germ cells that then give rise to cells resembling mature egg and sperm cells, known as gametes. However, the functionality of the gametes has not been thoroughly tested and many questions about the viability of these cells remain unanswered. Dr. Karim Na...

Pitt phage hunter takes on tuberculosis

.... They found that when infected by the Bomber, the germ could no longer form its protective coatings. Furthermore, this occurred because the phage had disrupted a M. smegmatis gene called groEL1-which has a nearly identical counterpart in M. tuberculosis. The NIH grant will allow Hatfull and Jacobs to ...

Study finds how organs monitor themselves during early development

...ary that allows the ovary to monitor the number of germ cells it contains and to correct that number if th... amount of stem cell precursors, called primordial germ cells (PGCs). Primordial germ cells are important cells. Some of them develop into germline stem cel...

Honey helps problem wounds

...with leukaemia have a weakened immune system. If a germ enters their bloodstream via a wound, the result may be a fatal case of blood poisoning. For several years now Bonn paediatricians have been pioneering the use in Germany of medihoney in treating wounds. Medihoney bears the CE seal for medical produ...

One big biology question solved

...ventually turn into either eggs or sperm ?known as germ cells ?are identical in male and female embryos. "Whether a germ cell develops into an egg or a sperm depends on the time at which meiosis begins," Professor Koopman...

Anemone genes reveal versatile building blocks for body plans

...eds, the proteins become segregated into different germ layers, with the TGFß ligands and downstream compo...nts deployed exclusively in the endoderm, or inner germ layer. It therefore appears that the ancient, ancestral function for this signaling system may hav...

Flu not the only germ threat this time of year

...g, wheezing, whining reminder that there are other germ threats. Infectious disease experts at the University of Rochester Medical Center have tracked the dangers from one of the most common bugs, RSV, and they say the threat to some groups of people, such as the elderly, equals that from flu. Even thoug...

Tool developed to silence genes in specific tissues using RNAi

... cell-to-cell contacts between nurse cells and the germ cells that ultimately become sperm. Using RNAi to silence WT1, therefore, led to the discovery that WT1 is the first transcription factor shown to regulate the formations of these junctions, Wilkinson says. "It is a transcription factor that dictate...

Penicillin, amoxicillin: Step aside for strep throat treatment

... sick on and off for weeks or months, as the strep germ isn't quite killed off but instead lingers in the child's body. The children also become vulnerable to much more severe infections that will demand the use of even stronger drugs later on. All the while, the still-contagious child is exposing his or ...

Sperm stem cells closer to being like embryonic stem cells

...rch team published results showing that mouse male germ stem cells could be made to exhibit pluripotent ch...ndings have yet to be repeated. Ordinarily, when germ stem cells divide into two cells, one "daughter" cell differentiates to become a sperm while the oth...

Chernobyl: The true scale of the accident

...effects of radiation were seen in both somatic and germ cells of plants and animals. Prohibiting agricultural and industrial activities in the exclusion zone permitted many plant and animal populations to expand and created, paradoxically, "a unique sanctuary for biodiversity." Does dismantlement of the ...

Study hints at role of stem cell genes in testicular, breast cancers

...have known that seminomas arise in sperm-producing germ cells, which are located in the testis and produce...ins very early in the formation of sperm-producing germ cells. Next, turning to cancerous tissue outside of the reproductive system, in this case breast ti...

Elderly mice yield clues to the process of growing old

...ss, loss of immune cells, anemia, and loss of male germ cells that lead to reduced sperm production and infertility. Intriguingly, the mice develop symptoms of old age, notably gray hair and hair loss, more commonly seen in humans than mice. Prolla suggests that new studies of mice engineered to have fe...

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